From ce16514534e5d7ebbc4fe46e2b09a25ccc5fdafd Mon Sep 17 00:00:00 2001
From: trondeau
Date: Wed, 2 Jan 2008 17:35:35 +0000
Subject: Merging ofdm2 branch -r7047:7321 into trunk. This updates the OFDM
code to hier_block2 in blks2impl and removed from blksimpl. The new code
implements a decision feedback sync loop to lock the phase/freq, removes two
unnecessary premables and performs frame sync and equalization off single
preamble symbol. Also adds/updates Python plotting tools and a branchless
clip algorithm in gr_math.h.
git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@7324 221aa14e-8319-0410-a670-987f0aec2ac5
---
.../src/python/gnuradio/blks2impl/Makefile.am | 6 +
.../src/python/gnuradio/blks2impl/ofdm.py | 311 +++++++++++++++++++++
.../src/python/gnuradio/blks2impl/ofdm_receiver.py | 112 ++++++++
.../python/gnuradio/blks2impl/ofdm_sync_fixed.py | 49 ++++
.../src/python/gnuradio/blks2impl/ofdm_sync_ml.py | 142 ++++++++++
.../src/python/gnuradio/blks2impl/ofdm_sync_pn.py | 146 ++++++++++
.../python/gnuradio/blks2impl/ofdm_sync_pnac.py | 131 +++++++++
.../src/python/gnuradio/blksimpl/Makefile.am | 6 -
gnuradio-core/src/python/gnuradio/blksimpl/ofdm.py | 305 --------------------
.../src/python/gnuradio/blksimpl/ofdm_receiver.py | 64 -----
.../python/gnuradio/blksimpl/ofdm_sync_fixed.py | 41 ---
.../src/python/gnuradio/blksimpl/ofdm_sync_ml.py | 135 ---------
.../src/python/gnuradio/blksimpl/ofdm_sync_pn.py | 135 ---------
.../src/python/gnuradio/blksimpl/ofdm_sync_pnac.py | 126 ---------
14 files changed, 897 insertions(+), 812 deletions(-)
create mode 100644 gnuradio-core/src/python/gnuradio/blks2impl/ofdm.py
create mode 100644 gnuradio-core/src/python/gnuradio/blks2impl/ofdm_receiver.py
create mode 100644 gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_fixed.py
create mode 100644 gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_ml.py
create mode 100644 gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_pn.py
create mode 100644 gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_pnac.py
delete mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm.py
delete mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm_receiver.py
delete mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_fixed.py
delete mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_ml.py
delete mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pn.py
delete mode 100644 gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pnac.py
(limited to 'gnuradio-core/src/python')
diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/Makefile.am b/gnuradio-core/src/python/gnuradio/blks2impl/Makefile.am
index e3d83aeee..934326d8f 100644
--- a/gnuradio-core/src/python/gnuradio/blks2impl/Makefile.am
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/Makefile.am
@@ -40,6 +40,12 @@ grblkspython_PYTHON = \
cpm.py \
nbfm_rx.py \
nbfm_tx.py \
+ ofdm.py \
+ ofdm_receiver.py \
+ ofdm_sync_fixed.py \
+ ofdm_sync_pn.py \
+ ofdm_sync_pnac.py \
+ ofdm_sync_ml.py \
pkt.py \
psk.py \
qam.py \
diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/ofdm.py b/gnuradio-core/src/python/gnuradio/blks2impl/ofdm.py
new file mode 100644
index 000000000..491ef1a19
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/ofdm.py
@@ -0,0 +1,311 @@
+#!/usr/bin/env python
+#
+# Copyright 2006,2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+import math
+from gnuradio import gr, ofdm_packet_utils
+import gnuradio.gr.gr_threading as _threading
+import psk, qam
+
+from gnuradio.blks2impl.ofdm_receiver import ofdm_receiver
+
+
+# /////////////////////////////////////////////////////////////////////////////
+# mod/demod with packets as i/o
+# /////////////////////////////////////////////////////////////////////////////
+
+class ofdm_mod(gr.hier_block2):
+ """
+ Modulates an OFDM stream. Based on the options fft_length, occupied_tones, and
+ cp_length, this block creates OFDM symbols using a specified modulation option.
+
+ Send packets by calling send_pkt
+ """
+ def __init__(self, options, msgq_limit=2, pad_for_usrp=True):
+ """
+ Hierarchical block for sending packets
+
+ Packets to be sent are enqueued by calling send_pkt.
+ The output is the complex modulated signal at baseband.
+
+ @param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
+ @param msgq_limit: maximum number of messages in message queue
+ @type msgq_limit: int
+ @param pad_for_usrp: If true, packets are padded such that they end up a multiple of 128 samples
+ """
+
+ gr.hier_block2.__init__(self, "ofdm_mod",
+ gr.io_signature(0, 0, 0), # Input signature
+ gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
+
+ self._pad_for_usrp = pad_for_usrp
+ self._modulation = options.modulation
+ self._fft_length = options.fft_length
+ self._occupied_tones = options.occupied_tones
+ self._cp_length = options.cp_length
+
+ win = [] #[1 for i in range(self._fft_length)]
+
+ # Use freq domain to get doubled-up known symbol for correlation in time domain
+ zeros_on_left = int(math.ceil((self._fft_length - self._occupied_tones)/2.0))
+ ksfreq = known_symbols_4512_3[0:self._occupied_tones]
+ for i in range(len(ksfreq)):
+ if((zeros_on_left + i) & 1):
+ ksfreq[i] = 0
+
+ # hard-coded known symbols
+ preambles = (ksfreq,)
+# known_symbols_4512_1[0:self._occupied_tones],
+# known_symbols_4512_2[0:self._occupied_tones])
+
+ padded_preambles = list()
+ for pre in preambles:
+ padded = self._fft_length*[0,]
+ padded[zeros_on_left : zeros_on_left + self._occupied_tones] = pre
+ padded_preambles.append(padded)
+
+ symbol_length = options.fft_length + options.cp_length
+
+ mods = {"bpsk": 2, "qpsk": 4, "8psk": 8, "qam8": 8, "qam16": 16, "qam64": 64, "qam256": 256}
+ arity = mods[self._modulation]
+
+ rot = 1
+ if self._modulation == "qpsk":
+ rot = (0.707+0.707j)
+
+ if(self._modulation.find("psk") >= 0):
+ rotated_const = map(lambda pt: pt * rot, psk.gray_constellation[arity])
+ elif(self._modulation.find("qam") >= 0):
+ rotated_const = map(lambda pt: pt * rot, qam.constellation[arity])
+ #print rotated_const
+ self._pkt_input = gr.ofdm_mapper_bcv(rotated_const, msgq_limit,
+ options.occupied_tones, options.fft_length)
+
+ self.preambles = gr.ofdm_insert_preamble(self._fft_length, padded_preambles)
+ self.ifft = gr.fft_vcc(self._fft_length, False, win, True)
+ self.cp_adder = gr.ofdm_cyclic_prefixer(self._fft_length, symbol_length)
+ self.scale = gr.multiply_const_cc(1.0 / math.sqrt(self._fft_length))
+
+ self.connect((self._pkt_input, 0), (self.preambles, 0))
+ self.connect((self._pkt_input, 1), (self.preambles, 1))
+ self.connect(self.preambles, self.ifft, self.cp_adder, self.scale, self)
+
+ if options.verbose:
+ self._print_verbage()
+
+ if options.log:
+ self.connect(self._pkt_input, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
+ "ofdm_mapper_c.dat"))
+ self.connect(self.preambles, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
+ "ofdm_preambles.dat"))
+ self.connect(self.ifft, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
+ "ofdm_ifft_c.dat"))
+ self.connect(self.cp_adder, gr.file_sink(gr.sizeof_gr_complex,
+ "ofdm_cp_adder_c.dat"))
+
+ def send_pkt(self, payload='', eof=False):
+ """
+ Send the payload.
+
+ @param payload: data to send
+ @type payload: string
+ """
+ if eof:
+ msg = gr.message(1) # tell self._pkt_input we're not sending any more packets
+ else:
+ # print "original_payload =", string_to_hex_list(payload)
+ pkt = ofdm_packet_utils.make_packet(payload, 1, 1, self._pad_for_usrp, whitening=True)
+
+ #print "pkt =", string_to_hex_list(pkt)
+ msg = gr.message_from_string(pkt)
+ self._pkt_input.msgq().insert_tail(msg)
+
+ def add_options(normal, expert):
+ """
+ Adds OFDM-specific options to the Options Parser
+ """
+ normal.add_option("-m", "--modulation", type="string", default="bpsk",
+ help="set modulation type (bpsk, qpsk, 8psk, qam{16,64}) [default=%default]")
+ expert.add_option("", "--fft-length", type="intx", default=512,
+ help="set the number of FFT bins [default=%default]")
+ expert.add_option("", "--occupied-tones", type="intx", default=200,
+ help="set the number of occupied FFT bins [default=%default]")
+ expert.add_option("", "--cp-length", type="intx", default=128,
+ help="set the number of bits in the cyclic prefix [default=%default]")
+ # Make a static method to call before instantiation
+ add_options = staticmethod(add_options)
+
+ def _print_verbage(self):
+ """
+ Prints information about the OFDM modulator
+ """
+ print "\nOFDM Modulator:"
+ print "Modulation Type: %s" % (self._modulation)
+ print "FFT length: %3d" % (self._fft_length)
+ print "Occupied Tones: %3d" % (self._occupied_tones)
+ print "CP length: %3d" % (self._cp_length)
+
+
+class ofdm_demod(gr.hier_block2):
+ """
+ Demodulates a received OFDM stream. Based on the options fft_length, occupied_tones, and
+ cp_length, this block performs synchronization, FFT, and demodulation of incoming OFDM
+ symbols and passes packets up the a higher layer.
+
+ The input is complex baseband. When packets are demodulated, they are passed to the
+ app via the callback.
+ """
+
+ def __init__(self, options, callback=None):
+ """
+ Hierarchical block for demodulating and deframing packets.
+
+ The input is the complex modulated signal at baseband.
+ Demodulated packets are sent to the handler.
+
+ @param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
+ @param callback: function of two args: ok, payload
+ @type callback: ok: bool; payload: string
+ """
+ gr.hier_block2.__init__(self, "ofdm_demod",
+ gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
+ gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
+
+
+ self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY
+
+ self._modulation = options.modulation
+ self._fft_length = options.fft_length
+ self._occupied_tones = options.occupied_tones
+ self._cp_length = options.cp_length
+ self._snr = options.snr
+
+ # Use freq domain to get doubled-up known symbol for correlation in time domain
+ ksfreq = known_symbols_4512_3[0:self._occupied_tones]
+ for i in range(len(ksfreq)):
+ if(i&1):
+ ksfreq[i] = 0
+
+ # hard-coded known symbols
+ preambles = (ksfreq,)
+ #known_symbols_4512_1[0:self._occupied_tones],
+ #known_symbols_4512_2[0:self._occupied_tones])
+
+ symbol_length = self._fft_length + self._cp_length
+ self.ofdm_recv = ofdm_receiver(self._fft_length, self._cp_length,
+ self._occupied_tones, self._snr, preambles,
+ options.log)
+
+ mods = {"bpsk": 2, "qpsk": 4, "8psk": 8, "qam8": 8, "qam16": 16, "qam64": 64, "qam256": 256}
+ arity = mods[self._modulation]
+
+ rot = 1
+ if self._modulation == "qpsk":
+ rot = (0.707+0.707j)
+
+ if(self._modulation.find("psk") >= 0):
+ rotated_const = map(lambda pt: pt * rot, psk.gray_constellation[arity])
+ elif(self._modulation.find("qam") >= 0):
+ rotated_const = map(lambda pt: pt * rot, qam.constellation[arity])
+ #print rotated_const
+ self.ofdm_demod = gr.ofdm_frame_sink(rotated_const, range(arity),
+ self._rcvd_pktq,
+ self._occupied_tones,
+ 0.25, 0.25*.25/4.0)
+
+ self.connect(self, self.ofdm_recv)
+ self.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))
+ self.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))
+
+ # added output signature to work around bug, though it might not be a bad
+ # thing to export, anyway
+ self.connect(self.ofdm_recv.chan_filt, self)
+
+ if options.log:
+ self.connect(self.ofdm_demod, gr.file_sink(gr.sizeof_gr_complex*self._occupied_tones, "ofdm_frame_sink_c.dat"))
+ else:
+ self.connect(self.ofdm_demod, gr.null_sink(gr.sizeof_gr_complex*self._occupied_tones))
+
+ if options.verbose:
+ self._print_verbage()
+
+ self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback)
+
+ def add_options(normal, expert):
+ """
+ Adds OFDM-specific options to the Options Parser
+ """
+ normal.add_option("-m", "--modulation", type="string", default="bpsk",
+ help="set modulation type (bpsk or qpsk) [default=%default]")
+ expert.add_option("", "--fft-length", type="intx", default=512,
+ help="set the number of FFT bins [default=%default]")
+ expert.add_option("", "--occupied-tones", type="intx", default=200,
+ help="set the number of occupied FFT bins [default=%default]")
+ expert.add_option("", "--cp-length", type="intx", default=128,
+ help="set the number of bits in the cyclic prefix [default=%default]")
+ # Make a static method to call before instantiation
+ add_options = staticmethod(add_options)
+
+ def _print_verbage(self):
+ """
+ Prints information about the OFDM demodulator
+ """
+ print "\nOFDM Demodulator:"
+ print "Modulation Type: %s" % (self._modulation)
+ print "FFT length: %3d" % (self._fft_length)
+ print "Occupied Tones: %3d" % (self._occupied_tones)
+ print "CP length: %3d" % (self._cp_length)
+
+
+
+class _queue_watcher_thread(_threading.Thread):
+ def __init__(self, rcvd_pktq, callback):
+ _threading.Thread.__init__(self)
+ self.setDaemon(1)
+ self.rcvd_pktq = rcvd_pktq
+ self.callback = callback
+ self.keep_running = True
+ self.start()
+
+
+ def run(self):
+ while self.keep_running:
+ msg = self.rcvd_pktq.delete_head()
+ ok, payload = ofdm_packet_utils.unmake_packet(msg.to_string())
+ if self.callback:
+ self.callback(ok, payload)
+
+# Generating known symbols with:
+# i = [2*random.randint(0,1)-1 for i in range(4512)]
+
+known_symbols_200_1 = [1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0]
+
+known_symbols_200_2 = [-1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0]
+
+
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+
+
+known_symbols_4512_impulse = 4512*[1,]
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-1, 1, -1, 1, 1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1]
diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_receiver.py b/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_receiver.py
new file mode 100644
index 000000000..9592755b1
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_receiver.py
@@ -0,0 +1,112 @@
+#!/usr/bin/env python
+#
+# Copyright 2006, 2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+import math
+from numpy import fft
+from gnuradio import gr
+from gnuradio.blks2impl.ofdm_sync_ml import ofdm_sync_ml
+from gnuradio.blks2impl.ofdm_sync_pn import ofdm_sync_pn
+from gnuradio.blks2impl.ofdm_sync_pnac import ofdm_sync_pnac
+from gnuradio.blks2impl.ofdm_sync_fixed import ofdm_sync_fixed
+
+class ofdm_receiver(gr.hier_block2):
+ """
+ Performs receiver synchronization on OFDM symbols.
+
+ The receiver performs channel filtering as well as symbol, frequency, and phase synchronization.
+ The synchronization routines are available in three flavors: preamble correlator (Schmidl and Cox),
+ modifid preamble correlator with autocorrelation (not yet working), and cyclic prefix correlator
+ (Van de Beeks).
+ """
+
+ def __init__(self, fft_length, cp_length, occupied_tones, snr, ks, logging=False):
+ """
+ Hierarchical block for receiving OFDM symbols.
+
+ The input is the complex modulated signal at baseband.
+ Synchronized packets are sent back to the demodulator.
+
+ @param fft_length: total number of subcarriers
+ @type fft_length: int
+ @param cp_length: length of cyclic prefix as specified in subcarriers (<= fft_length)
+ @type cp_length: int
+ @param occupied_tones: number of subcarriers used for data
+ @type occupied_tones: int
+ @param snr: estimated signal to noise ratio used to guide cyclic prefix synchronizer
+ @type snr: float
+ @param ks: known symbols used as preambles to each packet
+ @type ks: list of lists
+ @param logging: turn file logging on or off
+ @type logging: bool
+ """
+
+ gr.hier_block2.__init__(self, "ofdm_receiver",
+ gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
+ gr.io_signature2(2, 2, gr.sizeof_gr_complex*occupied_tones, gr.sizeof_char)) # Output signature
+
+ bw = (float(occupied_tones) / float(fft_length)) / 2.0
+ tb = bw*0.08
+ chan_coeffs = gr.firdes.low_pass (1.0, # gain
+ 1.0, # sampling rate
+ bw+tb, # midpoint of trans. band
+ tb, # width of trans. band
+ gr.firdes.WIN_HAMMING) # filter type
+ self.chan_filt = gr.fft_filter_ccc(1, chan_coeffs)
+
+ win = [1 for i in range(fft_length)]
+
+ zeros_on_left = int(math.ceil((fft_length - occupied_tones)/2.0))
+ zeros_on_right = fft_length - occupied_tones - zeros_on_left
+ ks0 = zeros_on_left*[0.0,]
+ ks0.extend(ks[0])
+ ks0.extend(zeros_on_right*[0.0,])
+
+ ks0time = fft.ifft(ks0)
+ # ADD SCALING FACTOR
+ ks0time = ks0time.tolist()
+
+ SYNC = "pn"
+ if SYNC == "ml":
+ self.ofdm_sync = ofdm_sync_ml(fft_length, cp_length, snr, logging)
+ elif SYNC == "pn":
+ self.ofdm_sync = ofdm_sync_pn(fft_length, cp_length, logging)
+ elif SYNC == "pnac":
+ self.ofdm_sync = ofdm_sync_pnac(fft_length, cp_length, ks0time)
+ elif SYNC == "fixed":
+ self.ofdm_sync = ofdm_sync_fixed(fft_length, cp_length, logging)
+
+ self.fft_demod = gr.fft_vcc(fft_length, True, win, True)
+ self.ofdm_frame_acq = gr.ofdm_frame_acquisition(occupied_tones, fft_length,
+ cp_length, ks[0])
+
+ self.connect(self, self.chan_filt)
+ self.connect(self.chan_filt, self.ofdm_sync, self.fft_demod, (self.ofdm_frame_acq,0))
+ self.connect((self.ofdm_sync,1), (self.ofdm_frame_acq,1))
+ self.connect((self.ofdm_frame_acq,0), (self,0))
+ self.connect((self.ofdm_frame_acq,1), (self,1))
+
+ if logging:
+ self.connect(self.chan_filt, gr.file_sink(gr.sizeof_gr_complex, "chan_filt_c.dat"))
+ self.connect(self.fft_demod, gr.file_sink(gr.sizeof_gr_complex*fft_length, "fft_out_c.dat"))
+ self.connect(self.ofdm_frame_acq,
+ gr.file_sink(gr.sizeof_gr_complex*occupied_tones, "ofdm_frame_acq_c.dat"))
+ self.connect((self.ofdm_frame_acq,1), gr.file_sink(1, "found_corr_b.dat"))
diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_fixed.py b/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_fixed.py
new file mode 100644
index 000000000..74acc8fde
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_fixed.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+import math
+from gnuradio import gr
+
+class ofdm_sync_fixed(gr.hier_block2):
+ def __init__(self, fft_length, cp_length, logging=False):
+
+ gr.hier_block2.__init__(self, "ofdm_sync_fixed",
+ gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
+ gr.io_signature2(2, 2, gr.sizeof_gr_complex*fft_length, gr.sizeof_char)) # Output signature
+
+ # Use a fixed trigger point instead of sync block
+ symbol_length = fft_length + cp_length
+ data = (symbol_length)*[0,]
+ data[(symbol_length)-1] = 1
+ self.peak_trigger = gr.vector_source_b(data, True)
+ self.sampler = gr.ofdm_sampler(fft_length, symbol_length)
+
+ self.connect(self, (self.sampler,0))
+ self.connect(self.peak_trigger, (self.sampler,1))
+ self.connect(self.sampler, (self,0))
+ self.connect(self.peak_trigger, (self,1))
+
+ if logging:
+ self.connect(self.peak_trigger, gr.file_sink(gr.sizeof_char, "ofdm_sync_fixed-peaks_b.dat"))
+ self.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length,
+ "ofdm_sync_fixed-sampler_c.dat"))
+
diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_ml.py b/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_ml.py
new file mode 100644
index 000000000..a93852623
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_ml.py
@@ -0,0 +1,142 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+import math
+from gnuradio import gr
+
+class ofdm_sync_ml(gr.hier_block2):
+ def __init__(self, fft_length, cp_length, snr, logging):
+ ''' Maximum Likelihood OFDM synchronizer:
+ J. van de Beek, M. Sandell, and P. O. Borjesson, "ML Estimation
+ of Time and Frequency Offset in OFDM Systems," IEEE Trans.
+ Signal Processing, vol. 45, no. 7, pp. 1800-1805, 1997.
+ '''
+
+ # FIXME: change the output signature
+ # should be the output of the divider (the normalized peaks) and
+ # the angle value out of the sample and hold block
+ # move sampler out of this block
+
+ gr.hier_block2.__init__(self, "ofdm_sync_ml",
+ gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
+ gr.io_signature(1, 1, gr.sizeof_gr_complex*fft_length)) # Output signature
+
+ self.input = gr.add_const_cc(0)
+
+ SNR = 10.0**(snr/10.0)
+ rho = SNR / (SNR + 1.0)
+ symbol_length = fft_length + cp_length
+
+ # ML Sync
+
+ # Energy Detection from ML Sync
+
+ self.connect(self, self.input)
+
+ # Create a delay line
+ self.delay = gr.delay(gr.sizeof_gr_complex, fft_length)
+ self.connect(self.input, self.delay)
+
+ # magnitude squared blocks
+ self.magsqrd1 = gr.complex_to_mag_squared()
+ self.magsqrd2 = gr.complex_to_mag_squared()
+ self.adder = gr.add_ff()
+
+ moving_sum_taps = [rho/2 for i in range(cp_length)]
+ self.moving_sum_filter = gr.fir_filter_fff(1,moving_sum_taps)
+
+ self.connect(self.input,self.magsqrd1)
+ self.connect(self.delay,self.magsqrd2)
+ self.connect(self.magsqrd1,(self.adder,0))
+ self.connect(self.magsqrd2,(self.adder,1))
+ self.connect(self.adder,self.moving_sum_filter)
+
+
+ # Correlation from ML Sync
+ self.conjg = gr.conjugate_cc();
+ self.mixer = gr.multiply_cc();
+
+ movingsum2_taps = [1.0 for i in range(cp_length)]
+ self.movingsum2 = gr.fir_filter_ccf(1,movingsum2_taps)
+
+ # Correlator data handler
+ self.c2mag = gr.complex_to_mag()
+ self.angle = gr.complex_to_arg()
+ self.connect(self.input,(self.mixer,1))
+ self.connect(self.delay,self.conjg,(self.mixer,0))
+ self.connect(self.mixer,self.movingsum2,self.c2mag)
+ self.connect(self.movingsum2,self.angle)
+
+ # ML Sync output arg, need to find maximum point of this
+ self.diff = gr.sub_ff()
+ self.connect(self.c2mag,(self.diff,0))
+ self.connect(self.moving_sum_filter,(self.diff,1))
+
+ #ML measurements input to sampler block and detect
+ nco_sensitivity = -1.0/fft_length
+ self.f2c = gr.float_to_complex()
+ self.sampler = gr.ofdm_sampler(fft_length,symbol_length)
+ self.pk_detect = gr.peak_detector_fb(0.2, 0.25, 30, 0.0005)
+ #self.pk_detect = gr.peak_detector2_fb()
+ self.sample_and_hold = gr.sample_and_hold_ff()
+ self.nco = gr.frequency_modulator_fc(nco_sensitivity)
+ self.sigmix = gr.multiply_cc()
+
+ # Mix the signal with an NCO controlled by the sync loop
+ self.connect(self.input, (self.sigmix,0))
+ self.connect(self.nco, (self.sigmix,1))
+ self.connect(self.sigmix, (self.sampler,0))
+
+ # use the sync loop values to set the sampler and the NCO
+ # self.diff = theta
+ # self.angle = epsilon
+
+ self.connect(self.diff, self.pk_detect)
+
+ use_dpll = 1
+ if use_dpll:
+ self.dpll = gr.dpll_bb(float(symbol_length),0.01)
+ self.connect(self.pk_detect, self.dpll)
+ self.connect(self.dpll, (self.sampler,1))
+ self.connect(self.dpll, (self.sample_and_hold,1))
+ else:
+ self.connect(self.pk_detect, (self.sampler,1))
+ self.connect(self.pk_detect, (self.sample_and_hold,1))
+
+ self.connect(self.angle, (self.sample_and_hold,0))
+ self.connect(self.sample_and_hold, self.nco)
+
+ self.connect(self.sampler, self)
+
+ if logging:
+ self.connect(self.diff, gr.file_sink(gr.sizeof_float, "ofdm_sync_ml-theta_f.dat"))
+ self.connect(self.angle, gr.file_sink(gr.sizeof_float, "ofdm_sync_ml-epsilon_f.dat"))
+ self.connect(self.pk_detect, gr.file_sink(gr.sizeof_char, "ofdm_sync_ml-peaks_b.dat"))
+ if use_dpll:
+ self.connect(self.dpll, gr.file_sink(gr.sizeof_char, "ofdm_sync_ml-dpll_b.dat"))
+
+ self.connect(self.sigmix, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_ml-sigmix_c.dat"))
+ self.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length, "ofdm_sync_ml-sampler_c.dat"))
+ self.connect(self.sample_and_hold, gr.file_sink(gr.sizeof_float, "ofdm_sync_ml-sample_and_hold_f.dat"))
+ self.connect(self.nco, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_ml-nco_c.dat"))
+ self.connect(self.input, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_ml-input_c.dat"))
+
diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_pn.py b/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_pn.py
new file mode 100644
index 000000000..e3e0ad9d2
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_pn.py
@@ -0,0 +1,146 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+import math
+from numpy import fft
+from gnuradio import gr
+
+class ofdm_sync_pn(gr.hier_block2):
+ def __init__(self, fft_length, cp_length, logging=False):
+ """
+ OFDM synchronization using PN Correlation:
+ T. M. Schmidl and D. C. Cox, "Robust Frequency and Timing
+ Synchonization for OFDM," IEEE Trans. Communications, vol. 45,
+ no. 12, 1997.
+ """
+
+ gr.hier_block2.__init__(self, "ofdm_sync_pn",
+ gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
+ gr.io_signature2(2, 2, gr.sizeof_gr_complex*fft_length, gr.sizeof_char)) # Output signature
+
+ # FIXME: when converting to hier_block2's, the output signature
+ # should be the output of the divider (the normalized peaks) and
+ # the angle value out of the sample and hold block
+
+ self.input = gr.add_const_cc(0)
+
+ symbol_length = fft_length + cp_length
+
+ # PN Sync
+
+ # Create a delay line
+ self.delay = gr.delay(gr.sizeof_gr_complex, fft_length/2)
+
+ # Correlation from ML Sync
+ self.conjg = gr.conjugate_cc();
+ self.corr = gr.multiply_cc();
+
+ # Create a moving sum filter for the corr output
+ if 1:
+ moving_sum_taps = [1.0 for i in range(fft_length//2)]
+ self.moving_sum_filter = gr.fir_filter_ccf(1,moving_sum_taps)
+ else:
+ moving_sum_taps = [complex(1.0,0.0) for i in range(fft_length//2)]
+ self.moving_sum_filter = gr.fft_filter_ccc(1,moving_sum_taps)
+
+ # Create a moving sum filter for the input
+ self.inputmag2 = gr.complex_to_mag_squared()
+ movingsum2_taps = [1.0 for i in range(fft_length//2)]
+
+ if 1:
+ self.inputmovingsum = gr.fir_filter_fff(1,movingsum2_taps)
+ else:
+ self.inputmovingsum = gr.fft_filter_fff(1,movingsum2_taps)
+
+ self.square = gr.multiply_ff()
+ self.normalize = gr.divide_ff()
+
+ # Get magnitude (peaks) and angle (phase/freq error)
+ self.c2mag = gr.complex_to_mag_squared()
+ self.angle = gr.complex_to_arg()
+
+ self.sample_and_hold = gr.sample_and_hold_ff()
+
+ # Mix the signal with an NCO controlled by the sync loop
+ nco_sensitivity = -2.0/fft_length
+ self.nco = gr.frequency_modulator_fc(nco_sensitivity)
+ self.sigmix = gr.multiply_cc()
+
+ #ML measurements input to sampler block and detect
+ self.sub1 = gr.add_const_ff(-1)
+ self.pk_detect = gr.peak_detector_fb(0.20, 0.20, 30, 0.001)
+ #self.pk_detect = gr.peak_detector2_fb()
+ #self.pk_detect = gr.threshold_detector_fb(0.5)
+ self.regen = gr.regenerate_bb(symbol_length)
+
+ # FIXME: If sampler doesn't get proper input, it can completely
+ # stall the flowgraph.
+ self.sampler = gr.ofdm_sampler(fft_length,symbol_length)
+
+ self.connect(self, self.input)
+
+ self.connect(self.input, self.delay)
+ self.connect(self.input, (self.corr,0))
+ self.connect(self.delay, self.conjg)
+ self.connect(self.conjg, (self.corr,1))
+ self.connect(self.corr, self.moving_sum_filter)
+ self.connect(self.moving_sum_filter, self.c2mag)
+ self.connect(self.moving_sum_filter, self.angle)
+ self.connect(self.angle, (self.sample_and_hold,0))
+ self.connect(self.sample_and_hold, self.nco)
+
+ self.connect(self.input, (self.sigmix,0))
+ self.connect(self.nco, (self.sigmix,1))
+ self.connect(self.sigmix, (self.sampler,0))
+
+ self.connect(self.input, self.inputmag2, self.inputmovingsum)
+ self.connect(self.inputmovingsum, (self.square,0))
+ self.connect(self.inputmovingsum, (self.square,1))
+ self.connect(self.square, (self.normalize,1))
+ self.connect(self.c2mag, (self.normalize,0))
+
+ # Create a moving sum filter for the corr output
+ matched_filter_taps = [1.0/cp_length for i in range(cp_length)]
+ self.matched_filter = gr.fir_filter_fff(1,matched_filter_taps)
+ self.connect(self.normalize, self.matched_filter)
+
+ self.connect(self.matched_filter, self.sub1, self.pk_detect)
+ self.connect(self.pk_detect, self.regen)
+ self.connect(self.regen, (self.sampler,1))
+ self.connect(self.pk_detect, (self.sample_and_hold,1))
+
+ # Set output from sampler
+ self.connect(self.sampler, (self,0))
+ self.connect(self.pk_detect, (self,1))
+
+ if logging:
+ self.connect(self.matched_filter, gr.file_sink(gr.sizeof_float, "ofdm_sync_pn-mf_f.dat"))
+ self.connect(self.normalize, gr.file_sink(gr.sizeof_float, "ofdm_sync_pn-theta_f.dat"))
+ self.connect(self.angle, gr.file_sink(gr.sizeof_float, "ofdm_sync_pn-epsilon_f.dat"))
+ self.connect(self.pk_detect, gr.file_sink(gr.sizeof_char, "ofdm_sync_pn-peaks_b.dat"))
+ self.connect(self.regen, gr.file_sink(gr.sizeof_char, "ofdm_sync_pn-regen_b.dat"))
+ self.connect(self.sigmix, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_pn-sigmix_c.dat"))
+ self.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length, "ofdm_sync_pn-sampler_c.dat"))
+ self.connect(self.sample_and_hold, gr.file_sink(gr.sizeof_float, "ofdm_sync_pn-sample_and_hold_f.dat"))
+ self.connect(self.nco, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_pn-nco_c.dat"))
+ self.connect(self.input, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_pn-input_c.dat"))
+
diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_pnac.py b/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_pnac.py
new file mode 100644
index 000000000..5c16a5703
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/ofdm_sync_pnac.py
@@ -0,0 +1,131 @@
+#!/usr/bin/env python
+#
+# Copyright 2007 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING. If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+import math
+from numpy import fft
+from gnuradio import gr
+
+class ofdm_sync_pnac(gr.hier_block2):
+ def __init__(self, fft_length, cp_length, ks):
+
+ # FIXME: change the output signature
+ # should be the output of the divider (the normalized peaks) and
+ # the angle value out of the sample and hold block
+ # move sampler out of this block
+
+ gr.hier_block2.__init__(self, "ofdm_sync_pnac",
+ gr.io_signature(1, 1, gr.sizeof_gr_complex), # Input signature
+ gr.io_signature(1, 1, gr.sizeof_gr_complex*fft_length)) # Output signature
+
+
+ self.input = gr.add_const_cc(0)
+
+ symbol_length = fft_length + cp_length
+
+ # PN Sync
+
+ # autocorrelate with the known symbol
+ ks = ks[0:fft_length//2]
+ ks.reverse()
+ self.crosscorr_filter = gr.fir_filter_ccc(1, ks)
+ self.connect(self.crosscorr_filter, gr.file_sink(gr.sizeof_gr_complex, "crosscorr.dat"))
+
+ # Create a delay line
+ self.delay = gr.delay(gr.sizeof_gr_complex, fft_length/2)
+
+ # Correlation from ML Sync
+ self.conjg = gr.conjugate_cc();
+ self.corr = gr.multiply_cc();
+
+ # Create a moving sum filter for the corr output
+ moving_sum_taps = [1.0 for i in range(fft_length//2)]
+ self.moving_sum_filter = gr.fir_filter_ccf(1,moving_sum_taps)
+
+ # Create a moving sum filter for the input
+ self.inputmag2 = gr.complex_to_mag_squared()
+ movingsum2_taps = [1.0 for i in range(fft_length/2)]
+ self.inputmovingsum = gr.fir_filter_fff(1,movingsum2_taps)
+ self.square = gr.multiply_ff()
+ self.normalize = gr.divide_ff()
+
+ # Get magnitude (peaks) and angle (phase/freq error)
+ self.c2mag = gr.complex_to_mag_squared()
+ self.angle = gr.complex_to_arg()
+
+ self.sample_and_hold = gr.sample_and_hold_ff()
+
+ # Mix the signal with an NCO controlled by the sync loop
+ nco_sensitivity = -1.0/fft_length
+ self.nco = gr.frequency_modulator_fc(nco_sensitivity)
+ self.sigmix = gr.multiply_cc()
+
+ #ML measurements input to sampler block and detect
+ self.sub1 = gr.add_const_ff(-1)
+ self.pk_detect = gr.peak_detector_fb(0.2, 0.25, 30, 0.0005)
+
+ self.sampler = gr.ofdm_sampler(fft_length,symbol_length)
+
+ self.connect(self, self.input)
+ self.connect(self.input, self.crosscorr_filter)
+ self.connect(self.crosscorr_filter, self.delay)
+ self.connect(self.crosscorr_filter, (self.corr,0))
+ self.connect(self.delay, self.conjg)
+ self.connect(self.conjg, (self.corr,1))
+ self.connect(self.corr, self.moving_sum_filter)
+ self.connect(self.moving_sum_filter, self.c2mag)
+ self.connect(self.moving_sum_filter, self.angle)
+ self.connect(self.angle, (self.sample_and_hold,0))
+ self.connect(self.sample_and_hold, self.nco)
+
+ self.connect(self.input, (self.sigmix,0))
+ self.connect(self.nco, (self.sigmix,1))
+ self.connect(self.sigmix, (self.sampler,0))
+
+ self.connect(self.input, self.inputmag2, self.inputmovingsum)
+ self.connect(self.inputmovingsum, (self.square,0))
+ self.connect(self.inputmovingsum, (self.square,1))
+ self.connect(self.square, (self.normalize,1))
+ self.connect(self.c2mag, (self.normalize,0))
+ self.connect(self.normalize, self.sub1, self.pk_detect)
+
+ self.connect(self.pk_detect, (self.sampler,1))
+ self.connect(self.pk_detect, (self.sample_and_hold,1))
+
+ self.connect(self.sampler, self)
+
+ if 1:
+ self.connect(self.normalize, gr.file_sink(gr.sizeof_float,
+ "ofdm_sync_pnac-theta_f.dat"))
+ self.connect(self.angle, gr.file_sink(gr.sizeof_float,
+ "ofdm_sync_pnac-epsilon_f.dat"))
+ self.connect(self.pk_detect, gr.file_sink(gr.sizeof_char,
+ "ofdm_sync_pnac-peaks_b.dat"))
+ self.connect(self.sigmix, gr.file_sink(gr.sizeof_gr_complex,
+ "ofdm_sync_pnac-sigmix_c.dat"))
+ self.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length,
+ "ofdm_sync_pnac-sampler_c.dat"))
+ self.connect(self.sample_and_hold, gr.file_sink(gr.sizeof_float,
+ "ofdm_sync_pnac-sample_and_hold_f.dat"))
+ self.connect(self.nco, gr.file_sink(gr.sizeof_gr_complex,
+ "ofdm_sync_pnac-nco_c.dat"))
+ self.connect(self.input, gr.file_sink(gr.sizeof_gr_complex,
+ "ofdm_sync_pnac-input_c.dat"))
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/Makefile.am b/gnuradio-core/src/python/gnuradio/blksimpl/Makefile.am
index b75fade58..74fa098d4 100644
--- a/gnuradio-core/src/python/gnuradio/blksimpl/Makefile.am
+++ b/gnuradio-core/src/python/gnuradio/blksimpl/Makefile.am
@@ -40,12 +40,6 @@ grblkspython_PYTHON = \
cpm.py \
nbfm_rx.py \
nbfm_tx.py \
- ofdm.py \
- ofdm_receiver.py \
- ofdm_sync_fixed.py \
- ofdm_sync_ml.py \
- ofdm_sync_pnac.py \
- ofdm_sync_pn.py \
pkt.py \
psk.py \
qam.py \
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm.py
deleted file mode 100644
index b040d8c7f..000000000
--- a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm.py
+++ /dev/null
@@ -1,305 +0,0 @@
-
-#
-# Copyright 2006,2007 Free Software Foundation, Inc.
-#
-# This file is part of GNU Radio
-#
-# GNU Radio is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3, or (at your option)
-# any later version.
-#
-# GNU Radio is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with GNU Radio; see the file COPYING. If not, write to
-# the Free Software Foundation, Inc., 51 Franklin Street,
-# Boston, MA 02110-1301, USA.
-#
-
-import math
-from numpy import fft
-from gnuradio import gr, ofdm_packet_utils
-import gnuradio.gr.gr_threading as _threading
-import psk, qam
-
-from gnuradio.blksimpl.ofdm_receiver import ofdm_receiver
-
-
-# /////////////////////////////////////////////////////////////////////////////
-# mod/demod with packets as i/o
-# /////////////////////////////////////////////////////////////////////////////
-
-class ofdm_mod(gr.hier_block):
- """
- Modulates an OFDM stream. Based on the options fft_length, occupied_tones, and
- cp_length, this block creates OFDM symbols using a specified modulation option.
-
- Send packets by calling send_pkt
- """
- def __init__(self, fg, options, msgq_limit=2, pad_for_usrp=True):
- """
- Hierarchical block for sending packets
-
- Packets to be sent are enqueued by calling send_pkt.
- The output is the complex modulated signal at baseband.
-
- @param fg: flow graph
- @type fg: flow graph
- @param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
- @param msgq_limit: maximum number of messages in message queue
- @type msgq_limit: int
- @param pad_for_usrp: If true, packets are padded such that they end up a multiple of 128 samples
- """
-
- self._pad_for_usrp = pad_for_usrp
- self._modulation = options.modulation
- self._fft_length = options.fft_length
- self._occupied_tones = options.occupied_tones
- self._cp_length = options.cp_length
-
- win = [] #[1 for i in range(self._fft_length)]
-
- # Use freq domain to get doubled-up known symbol for correlation in time domain
- zeros_on_left = int(math.ceil((self._fft_length - self._occupied_tones)/2.0))
- ksfreq = known_symbols_4512_3[0:self._occupied_tones]
- for i in range(len(ksfreq)):
- if((zeros_on_left + i) & 1):
- ksfreq[i] = 0
-
- # hard-coded known symbols
- preambles = (ksfreq,
- known_symbols_4512_1[0:self._occupied_tones],
- known_symbols_4512_2[0:self._occupied_tones])
-
- padded_preambles = list()
- for pre in preambles:
- padded = self._fft_length*[0,]
- padded[zeros_on_left : zeros_on_left + self._occupied_tones] = pre
- padded_preambles.append(padded)
-
- symbol_length = options.fft_length + options.cp_length
-
- mods = {"bpsk": 2, "qpsk": 4, "8psk": 8, "qam8": 8, "qam16": 16, "qam64": 64, "qam256": 256}
- arity = mods[self._modulation]
-
- rot = 1
- if self._modulation == "qpsk":
- rot = (0.707+0.707j)
-
- if(self._modulation.find("psk") >= 0):
- rotated_const = map(lambda pt: pt * rot, psk.gray_constellation[arity])
- elif(self._modulation.find("qam") >= 0):
- rotated_const = map(lambda pt: pt * rot, qam.constellation[arity])
- #print rotated_const
- self._pkt_input = gr.ofdm_mapper_bcv(rotated_const, msgq_limit,
- options.occupied_tones, options.fft_length)
-
- self.preambles = gr.ofdm_insert_preamble(self._fft_length, padded_preambles)
- self.ifft = gr.fft_vcc(self._fft_length, False, win, True)
- self.cp_adder = gr.ofdm_cyclic_prefixer(self._fft_length, symbol_length)
- self.scale = gr.multiply_const_cc(1.0 / math.sqrt(self._fft_length))
-
- fg.connect((self._pkt_input, 0), (self.preambles, 0))
- fg.connect((self._pkt_input, 1), (self.preambles, 1))
- fg.connect(self.preambles, self.ifft, self.cp_adder, self.scale)
-
- if options.verbose:
- self._print_verbage()
-
- if options.log:
- fg.connect(self._pkt_input, gr.file_sink(gr.sizeof_gr_complex*options.fft_length,
- "ofdm_mapper_c.dat"))
-
- gr.hier_block.__init__(self, fg, None, self.scale)
-
- def send_pkt(self, payload='', eof=False):
- """
- Send the payload.
-
- @param payload: data to send
- @type payload: string
- """
- if eof:
- msg = gr.message(1) # tell self._pkt_input we're not sending any more packets
- else:
- # print "original_payload =", string_to_hex_list(payload)
- pkt = ofdm_packet_utils.make_packet(payload, 1, 1, self._pad_for_usrp, whitening=True)
-
- #print "pkt =", string_to_hex_list(pkt)
- msg = gr.message_from_string(pkt)
- self._pkt_input.msgq().insert_tail(msg)
-
- def add_options(normal, expert):
- """
- Adds OFDM-specific options to the Options Parser
- """
- normal.add_option("-m", "--modulation", type="string", default="bpsk",
- help="set modulation type (bpsk or qpsk) [default=%default]")
- expert.add_option("", "--fft-length", type="intx", default=512,
- help="set the number of FFT bins [default=%default]")
- expert.add_option("", "--occupied-tones", type="intx", default=200,
- help="set the number of occupied FFT bins [default=%default]")
- expert.add_option("", "--cp-length", type="intx", default=128,
- help="set the number of bits in the cyclic prefix [default=%default]")
- # Make a static method to call before instantiation
- add_options = staticmethod(add_options)
-
- def _print_verbage(self):
- """
- Prints information about the OFDM modulator
- """
- print "\nOFDM Modulator:"
- print "Modulation Type: %s" % (self._modulation)
- print "FFT length: %3d" % (self._fft_length)
- print "Occupied Tones: %3d" % (self._occupied_tones)
- print "CP length: %3d" % (self._cp_length)
-
-
-class ofdm_demod(gr.hier_block):
- """
- Demodulates a received OFDM stream. Based on the options fft_length, occupied_tones, and
- cp_length, this block performs synchronization, FFT, and demodulation of incoming OFDM
- symbols and passes packets up the a higher layer.
-
- The input is complex baseband. When packets are demodulated, they are passed to the
- app via the callback.
- """
-
- def __init__(self, fg, options, callback=None):
- """
- Hierarchical block for demodulating and deframing packets.
-
- The input is the complex modulated signal at baseband.
- Demodulated packets are sent to the handler.
-
- @param fg: flow graph
- @type fg: flow graph
- @param options: pass modulation options from higher layers (fft length, occupied tones, etc.)
- @param callback: function of two args: ok, payload
- @type callback: ok: bool; payload: string
- """
- self._rcvd_pktq = gr.msg_queue() # holds packets from the PHY
-
- self._modulation = options.modulation
- self._fft_length = options.fft_length
- self._occupied_tones = options.occupied_tones
- self._cp_length = options.cp_length
- self._snr = options.snr
-
-
- # Use freq domain to get doubled-up known symbol for correlation in time domain
- ksfreq = known_symbols_4512_3[0:self._occupied_tones]
- for i in range(len(ksfreq)):
- if(i&1):
- ksfreq[i] = 0
-
- zeros_on_left = int(math.ceil((self._fft_length - self._occupied_tones)/2.0))
- zeros_on_right = self._fft_length - self._occupied_tones - zeros_on_left
- ks0 = zeros_on_left*[0.0,]
- ks0.extend(ksfreq)
- ks0.extend(zeros_on_right*[0.0,])
-
- ks0time = fft.ifft(ks0)
- # ADD SCALING FACTOR
- ks0time = ks0time.tolist()
-
- # hard-coded known symbols
- preambles = (ks0time,
- known_symbols_4512_1[0:self._occupied_tones],
- known_symbols_4512_2[0:self._occupied_tones])
-
- symbol_length = self._fft_length + self._cp_length
- self.ofdm_recv = ofdm_receiver(fg, self._fft_length, self._cp_length,
- self._occupied_tones, self._snr, preambles,
- options.log)
-
- mods = {"bpsk": 2, "qpsk": 4, "8psk": 8, "qam8": 8, "qam16": 16, "qam64": 64, "qam256": 256}
- arity = mods[self._modulation]
-
- rot = 1
- if self._modulation == "qpsk":
- rot = (0.707+0.707j)
-
- if(self._modulation.find("psk") >= 0):
- rotated_const = map(lambda pt: pt * rot, psk.gray_constellation[arity])
- elif(self._modulation.find("qam") >= 0):
- rotated_const = map(lambda pt: pt * rot, qam.constellation[arity])
- #print rotated_const
- self.ofdm_demod = gr.ofdm_frame_sink(rotated_const, range(arity),
- self._rcvd_pktq,
- self._occupied_tones)
-
- fg.connect((self.ofdm_recv, 0), (self.ofdm_demod, 0))
- fg.connect((self.ofdm_recv, 1), (self.ofdm_demod, 1))
-
- if options.verbose:
- self._print_verbage()
-
- gr.hier_block.__init__(self, fg, self.ofdm_recv, None)
- self._watcher = _queue_watcher_thread(self._rcvd_pktq, callback)
-
-
- def add_options(normal, expert):
- """
- Adds OFDM-specific options to the Options Parser
- """
- normal.add_option("-m", "--modulation", type="string", default="bpsk",
- help="set modulation type (bpsk or qpsk) [default=%default]")
- expert.add_option("", "--fft-length", type="intx", default=512,
- help="set the number of FFT bins [default=%default]")
- expert.add_option("", "--occupied-tones", type="intx", default=200,
- help="set the number of occupied FFT bins [default=%default]")
- expert.add_option("", "--cp-length", type="intx", default=128,
- help="set the number of bits in the cyclic prefix [default=%default]")
- # Make a static method to call before instantiation
- add_options = staticmethod(add_options)
-
- def _print_verbage(self):
- """
- Prints information about the OFDM demodulator
- """
- print "\nOFDM Demodulator:"
- print "Modulation Type: %s" % (self._modulation)
- print "FFT length: %3d" % (self._fft_length)
- print "Occupied Tones: %3d" % (self._occupied_tones)
- print "CP length: %3d" % (self._cp_length)
-
-
-
-class _queue_watcher_thread(_threading.Thread):
- def __init__(self, rcvd_pktq, callback):
- _threading.Thread.__init__(self)
- self.setDaemon(1)
- self.rcvd_pktq = rcvd_pktq
- self.callback = callback
- self.keep_running = True
- self.start()
-
-
- def run(self):
- while self.keep_running:
- msg = self.rcvd_pktq.delete_head()
- ok, payload = ofdm_packet_utils.unmake_packet(msg.to_string())
- if self.callback:
- self.callback(ok, payload)
-
-# Generating known symbols with:
-# i = [2*random.randint(0,1)-1 for i in range(4512)]
-
-known_symbols_200_1 = [1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0]
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-known_symbols_200_2 = [-1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, 1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, -1.0, -1.0, -1.0, -1.0, -1.0, 1.0, -1.0, -1.0, -1.0, 1.0, 1.0, 1.0]
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-known_symbols_4512_impulse = 4512*[1,]
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-1, 1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1]
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_receiver.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_receiver.py
deleted file mode 100644
index d16d2e294..000000000
--- a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_receiver.py
+++ /dev/null
@@ -1,64 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2006, 2007 Free Software Foundation, Inc.
-#
-# This file is part of GNU Radio
-#
-# GNU Radio is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3, or (at your option)
-# any later version.
-#
-# GNU Radio is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with GNU Radio; see the file COPYING. If not, write to
-# the Free Software Foundation, Inc., 51 Franklin Street,
-# Boston, MA 02110-1301, USA.
-#
-
-import math
-from gnuradio import gr
-from gnuradio.blksimpl.ofdm_sync_ml import ofdm_sync_ml
-from gnuradio.blksimpl.ofdm_sync_pn import ofdm_sync_pn
-from gnuradio.blksimpl.ofdm_sync_pnac import ofdm_sync_pnac
-
-class ofdm_receiver(gr.hier_block):
- def __init__(self, fg, fft_length, cp_length, occupied_tones, snr, ks, logging=False):
- self.fg = fg
-
- bw = (float(occupied_tones) / float(fft_length)) / 2.0
- tb = bw*0.08
- chan_coeffs = gr.firdes.low_pass (1.0, # gain
- 1.0, # sampling rate
- bw+tb, # midpoint of trans. band
- tb, # width of trans. band
- gr.firdes.WIN_HAMMING) # filter type
- self.chan_filt = gr.fft_filter_ccc(1, chan_coeffs)
-
- win = [1 for i in range(fft_length)]
-
- SYNC = "pn"
- if SYNC == "ml":
- self.ofdm_sync = ofdm_sync_ml(fg, fft_length, cp_length, snr, logging)
- elif SYNC == "pn":
- self.ofdm_sync = ofdm_sync_pn(fg, fft_length, cp_length, logging)
- elif SYNC == "pnac":
- self.ofdm_sync = ofdm_sync_pnac(fg, fft_length, cp_length, ks[0])
-
- self.fft_demod = gr.fft_vcc(fft_length, True, win, True)
- self.ofdm_corr = gr.ofdm_correlator(occupied_tones, fft_length,
- cp_length, ks[1], ks[2])
-
- self.fg.connect(self.chan_filt, self.ofdm_sync, self.fft_demod, self.ofdm_corr)
-
- if logging:
- self.fg.connect(self.chan_filt, gr.file_sink(gr.sizeof_gr_complex, "chan_filt_c.dat"))
- self.fg.connect(self.fft_demod, gr.file_sink(gr.sizeof_gr_complex*fft_length, "fft_out_c.dat"))
- self.fg.connect(self.ofdm_corr, gr.file_sink(gr.sizeof_gr_complex*occupied_tones, "ofdm_corr_out_c.dat"))
- self.fg.connect((self.ofdm_corr,1), gr.file_sink(1, "found_corr_b.dat"))
-
- gr.hier_block.__init__(self, fg, self.chan_filt, self.ofdm_corr)
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_fixed.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_fixed.py
deleted file mode 100644
index b56f65660..000000000
--- a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_fixed.py
+++ /dev/null
@@ -1,41 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2007 Free Software Foundation, Inc.
-#
-# This file is part of GNU Radio
-#
-# GNU Radio is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3, or (at your option)
-# any later version.
-#
-# GNU Radio is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with GNU Radio; see the file COPYING. If not, write to
-# the Free Software Foundation, Inc., 51 Franklin Street,
-# Boston, MA 02110-1301, USA.
-#
-
-import math
-from gnuradio import gr
-
-class ofdm_sync_fixed(gr.hier_block):
- def __init__(self, fg, fft_length, cp_length, snr):
- self.fg = fg
-
- # Use a fixed trigger point instead of sync block
- data = (fft_length+cp_len)*[0,]
- data[(fft_length+cp_len)-1] = 1
- peak_trigger = gr.vector_source_b(data, True)
-
- self.fg.connect(peak_trigger, (self.sampler,1))
-
- if 1:
- self.fg.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length,
- "ofdm_sync_fixed-sampler_c.dat"))
-
- gr.hier_block.__init__(self, fg, (self.sampler,0), self.sampler)
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_ml.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_ml.py
deleted file mode 100644
index d58f56cff..000000000
--- a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_ml.py
+++ /dev/null
@@ -1,135 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2007 Free Software Foundation, Inc.
-#
-# This file is part of GNU Radio
-#
-# GNU Radio is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3, or (at your option)
-# any later version.
-#
-# GNU Radio is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with GNU Radio; see the file COPYING. If not, write to
-# the Free Software Foundation, Inc., 51 Franklin Street,
-# Boston, MA 02110-1301, USA.
-#
-
-import math
-from gnuradio import gr
-
-class ofdm_sync_ml(gr.hier_block):
- def __init__(self, fg, fft_length, cp_length, snr, logging):
- ''' Maximum Likelihood OFDM synchronizer:
- J. van de Beek, M. Sandell, and P. O. Borjesson, "ML Estimation
- of Time and Frequency Offset in OFDM Systems," IEEE Trans.
- Signal Processing, vol. 45, no. 7, pp. 1800-1805, 1997.
- '''
-
- self.fg = fg
-
- # FIXME: when converting to hier_block2's, the output signature
- # should be the output of the divider (the normalized peaks) and
- # the angle value out of the sample and hold block
-
- self.input = gr.add_const_cc(0)
-
- SNR = 10.0**(snr/10.0)
- rho = SNR / (SNR + 1.0)
- symbol_length = fft_length + cp_length
-
- # ML Sync
-
- # Energy Detection from ML Sync
-
- # Create a delay line
- self.delay = gr.delay(gr.sizeof_gr_complex, fft_length)
- self.fg.connect(self.input, self.delay)
-
- # magnitude squared blocks
- self.magsqrd1 = gr.complex_to_mag_squared()
- self.magsqrd2 = gr.complex_to_mag_squared()
- self.adder = gr.add_ff()
-
- moving_sum_taps = [rho/2 for i in range(cp_length)]
- self.moving_sum_filter = gr.fir_filter_fff(1,moving_sum_taps)
-
- self.fg.connect(self.input,self.magsqrd1)
- self.fg.connect(self.delay,self.magsqrd2)
- self.fg.connect(self.magsqrd1,(self.adder,0))
- self.fg.connect(self.magsqrd2,(self.adder,1))
- self.fg.connect(self.adder,self.moving_sum_filter)
-
-
- # Correlation from ML Sync
- self.conjg = gr.conjugate_cc();
- self.mixer = gr.multiply_cc();
-
- movingsum2_taps = [1.0 for i in range(cp_length)]
- self.movingsum2 = gr.fir_filter_ccf(1,movingsum2_taps)
-
- # Correlator data handler
- self.c2mag = gr.complex_to_mag()
- self.angle = gr.complex_to_arg()
- self.fg.connect(self.input,(self.mixer,1))
- self.fg.connect(self.delay,self.conjg,(self.mixer,0))
- self.fg.connect(self.mixer,self.movingsum2,self.c2mag)
- self.fg.connect(self.movingsum2,self.angle)
-
- # ML Sync output arg, need to find maximum point of this
- self.diff = gr.sub_ff()
- self.fg.connect(self.c2mag,(self.diff,0))
- self.fg.connect(self.moving_sum_filter,(self.diff,1))
-
- #ML measurements input to sampler block and detect
- nco_sensitivity = -1.0/fft_length
- self.f2c = gr.float_to_complex()
- self.sampler = gr.ofdm_sampler(fft_length,symbol_length)
- self.pk_detect = gr.peak_detector_fb(0.2, 0.25, 30, 0.0005)
- self.sample_and_hold = gr.sample_and_hold_ff()
- self.nco = gr.frequency_modulator_fc(nco_sensitivity)
- self.sigmix = gr.multiply_cc()
-
- # Mix the signal with an NCO controlled by the sync loop
- self.fg.connect(self.input, (self.sigmix,0))
- self.fg.connect(self.nco, (self.sigmix,1))
- self.fg.connect(self.sigmix, (self.sampler,0))
-
- # use the sync loop values to set the sampler and the NCO
- # self.diff = theta
- # self.angle = epsilon
-
- self.fg.connect(self.diff, self.pk_detect)
-
- use_dpll = 1
- if use_dpll:
- self.dpll = gr.dpll_bb(float(symbol_length),0.01)
- self.fg.connect(self.pk_detect, self.dpll)
- self.fg.connect(self.dpll, (self.sampler,1))
- self.fg.connect(self.dpll, (self.sample_and_hold,1))
- else:
- self.fg.connect(self.pk_detect, (self.sampler,1))
- self.fg.connect(self.pk_detect, (self.sample_and_hold,1))
-
- self.fg.connect(self.angle, (self.sample_and_hold,0))
- self.fg.connect(self.sample_and_hold, self.nco)
-
- if logging:
- self.fg.connect(self.diff, gr.file_sink(gr.sizeof_float, "ofdm_sync_ml-theta_f.dat"))
- self.fg.connect(self.angle, gr.file_sink(gr.sizeof_float, "ofdm_sync_ml-epsilon_f.dat"))
- self.fg.connect(self.pk_detect, gr.file_sink(gr.sizeof_char, "ofdm_sync_ml-peaks_b.dat"))
- if use_dpll:
- self.fg.connect(self.dpll, gr.file_sink(gr.sizeof_char, "ofdm_sync_ml-dpll_b.dat"))
-
- self.fg.connect(self.sigmix, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_ml-sigmix_c.dat"))
- self.fg.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length, "ofdm_sync_ml-sampler_c.dat"))
- self.fg.connect(self.sample_and_hold, gr.file_sink(gr.sizeof_float, "ofdm_sync_ml-sample_and_hold_f.dat"))
- self.fg.connect(self.nco, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_ml-nco_c.dat"))
- self.fg.connect(self.input, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_ml-input_c.dat"))
-
- gr.hier_block.__init__(self, fg, self.input, self.sampler)
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pn.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pn.py
deleted file mode 100644
index 56425868f..000000000
--- a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pn.py
+++ /dev/null
@@ -1,135 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2007 Free Software Foundation, Inc.
-#
-# This file is part of GNU Radio
-#
-# GNU Radio is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3, or (at your option)
-# any later version.
-#
-# GNU Radio is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with GNU Radio; see the file COPYING. If not, write to
-# the Free Software Foundation, Inc., 51 Franklin Street,
-# Boston, MA 02110-1301, USA.
-#
-
-import math
-from numpy import fft
-from gnuradio import gr
-
-class ofdm_sync_pn(gr.hier_block):
- def __init__(self, fg, fft_length, cp_length, logging=False):
- ''' OFDM synchronization using PN Correlation:
- T. M. Schmidl and D. C. Cox, "Robust Frequency and Timing
- Synchonization for OFDM," IEEE Trans. Communications, vol. 45,
- no. 12, 1997.
- '''
-
- self.fg = fg
-
- # FIXME: when converting to hier_block2's, the output signature
- # should be the output of the divider (the normalized peaks) and
- # the angle value out of the sample and hold block
-
- self.input = gr.add_const_cc(0)
-
- symbol_length = fft_length + cp_length
-
- # PN Sync
-
- # Create a delay line
- self.delay = gr.delay(gr.sizeof_gr_complex, fft_length/2)
-
- # Correlation from ML Sync
- self.conjg = gr.conjugate_cc();
- self.corr = gr.multiply_cc();
-
- # Create a moving sum filter for the corr output
- if 1:
- moving_sum_taps = [1.0 for i in range(fft_length//2)]
- self.moving_sum_filter = gr.fir_filter_ccf(1,moving_sum_taps)
- else:
- moving_sum_taps = [complex(1.0,0.0) for i in range(fft_length//2)]
- self.moving_sum_filter = gr.fft_filter_ccc(1,moving_sum_taps)
-
- # Create a moving sum filter for the input
- self.inputmag2 = gr.complex_to_mag_squared()
- movingsum2_taps = [1.0 for i in range(fft_length//2)]
-
- if 1:
- self.inputmovingsum = gr.fir_filter_fff(1,movingsum2_taps)
- else:
- self.inputmovingsum = gr.fft_filter_fff(1,movingsum2_taps)
-
- self.square = gr.multiply_ff()
- self.normalize = gr.divide_ff()
-
- # Get magnitude (peaks) and angle (phase/freq error)
- self.c2mag = gr.complex_to_mag_squared()
- self.angle = gr.complex_to_arg()
-
- self.sample_and_hold = gr.sample_and_hold_ff()
-
- # Mix the signal with an NCO controlled by the sync loop
- nco_sensitivity = -2.0/fft_length
- self.nco = gr.frequency_modulator_fc(nco_sensitivity)
- self.sigmix = gr.multiply_cc()
-
- #ML measurements input to sampler block and detect
- self.sub1 = gr.add_const_ff(-1)
- self.pk_detect = gr.peak_detector_fb(0.2, 0.25, 30, 0.0005)
- self.regen = gr.regenerate_bb(symbol_length)
-
- self.sampler = gr.ofdm_sampler(fft_length,symbol_length)
-
- self.fg.connect(self.input, self.delay)
- self.fg.connect(self.input, (self.corr,0))
- self.fg.connect(self.delay, self.conjg)
- self.fg.connect(self.conjg, (self.corr,1))
- self.fg.connect(self.corr, self.moving_sum_filter)
- self.fg.connect(self.moving_sum_filter, self.c2mag)
- self.fg.connect(self.moving_sum_filter, self.angle)
- self.fg.connect(self.angle, (self.sample_and_hold,0))
- self.fg.connect(self.sample_and_hold, self.nco)
-
- self.fg.connect(self.input, (self.sigmix,0))
- self.fg.connect(self.nco, (self.sigmix,1))
- self.fg.connect(self.sigmix, (self.sampler,0))
-
- self.fg.connect(self.input, self.inputmag2, self.inputmovingsum)
- self.fg.connect(self.inputmovingsum, (self.square,0))
- self.fg.connect(self.inputmovingsum, (self.square,1))
- self.fg.connect(self.square, (self.normalize,1))
- self.fg.connect(self.c2mag, (self.normalize,0))
-
- # Create a moving sum filter for the corr output
- matched_filter_taps = [1.0/cp_length for i in range(cp_length)]
- self.matched_filter = gr.fir_filter_fff(1,matched_filter_taps)
- self.fg.connect(self.normalize, self.matched_filter)
-
- self.fg.connect(self.matched_filter, self.sub1, self.pk_detect)
- self.fg.connect(self.pk_detect, self.regen)
- self.fg.connect(self.regen, (self.sampler,1))
- self.fg.connect(self.pk_detect, (self.sample_and_hold,1))
-
-
- if logging:
- self.fg.connect(self.matched_filter, gr.file_sink(gr.sizeof_float, "ofdm_sync_pn-mf_f.dat"))
- self.fg.connect(self.normalize, gr.file_sink(gr.sizeof_float, "ofdm_sync_pn-theta_f.dat"))
- self.fg.connect(self.angle, gr.file_sink(gr.sizeof_float, "ofdm_sync_pn-epsilon_f.dat"))
- self.fg.connect(self.pk_detect, gr.file_sink(gr.sizeof_char, "ofdm_sync_pn-peaks_b.dat"))
- self.fg.connect(self.regen, gr.file_sink(gr.sizeof_char, "ofdm_sync_pn-regen_b.dat"))
- self.fg.connect(self.sigmix, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_pn-sigmix_c.dat"))
- self.fg.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length, "ofdm_sync_pn-sampler_c.dat"))
- self.fg.connect(self.sample_and_hold, gr.file_sink(gr.sizeof_float, "ofdm_sync_pn-sample_and_hold_f.dat"))
- self.fg.connect(self.nco, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_pn-nco_c.dat"))
- self.fg.connect(self.input, gr.file_sink(gr.sizeof_gr_complex, "ofdm_sync_pn-input_c.dat"))
-
- gr.hier_block.__init__(self, fg, self.input, self.sampler)
diff --git a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pnac.py b/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pnac.py
deleted file mode 100644
index e3774e341..000000000
--- a/gnuradio-core/src/python/gnuradio/blksimpl/ofdm_sync_pnac.py
+++ /dev/null
@@ -1,126 +0,0 @@
-#!/usr/bin/env python
-#
-# Copyright 2007 Free Software Foundation, Inc.
-#
-# This file is part of GNU Radio
-#
-# GNU Radio is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 3, or (at your option)
-# any later version.
-#
-# GNU Radio is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with GNU Radio; see the file COPYING. If not, write to
-# the Free Software Foundation, Inc., 51 Franklin Street,
-# Boston, MA 02110-1301, USA.
-#
-
-import math
-from numpy import fft
-from gnuradio import gr
-
-class ofdm_sync_pnac(gr.hier_block):
- def __init__(self, fg, fft_length, cp_length, ks):
- self.fg = fg
-
- # FIXME: when converting to hier_block2's, the output signature
- # should be the output of the divider (the normalized peaks) and
- # the angle value out of the sample and hold block
-
- self.input = gr.add_const_cc(0)
-
- symbol_length = fft_length + cp_length
-
- # PN Sync
-
- # autocorrelate with the known symbol
- ks = ks[0:fft_length//2]
- ks.reverse()
- self.crosscorr_filter = gr.fir_filter_ccc(1, ks)
- self.fg.connect(self.crosscorr_filter, gr.file_sink(gr.sizeof_gr_complex, "crosscorr.dat"))
-
- # Create a delay line
- self.delay = gr.delay(gr.sizeof_gr_complex, fft_length/2)
-
- # Correlation from ML Sync
- self.conjg = gr.conjugate_cc();
- self.corr = gr.multiply_cc();
-
- # Create a moving sum filter for the corr output
- moving_sum_taps = [1.0 for i in range(fft_length//2)]
- self.moving_sum_filter = gr.fir_filter_ccf(1,moving_sum_taps)
-
- # Create a moving sum filter for the input
- self.inputmag2 = gr.complex_to_mag_squared()
- movingsum2_taps = [1.0 for i in range(fft_length/2)]
- self.inputmovingsum = gr.fir_filter_fff(1,movingsum2_taps)
- self.square = gr.multiply_ff()
- self.normalize = gr.divide_ff()
-
- # Get magnitude (peaks) and angle (phase/freq error)
- self.c2mag = gr.complex_to_mag_squared()
- self.angle = gr.complex_to_arg()
-
- self.sample_and_hold = gr.sample_and_hold_ff()
-
- # Mix the signal with an NCO controlled by the sync loop
- nco_sensitivity = -1.0/fft_length
- self.nco = gr.frequency_modulator_fc(nco_sensitivity)
- self.sigmix = gr.multiply_cc()
-
- #ML measurements input to sampler block and detect
- self.sub1 = gr.add_const_ff(-1)
- self.pk_detect = gr.peak_detector_fb(0.2, 0.25, 30, 0.0005)
-
- self.sampler = gr.ofdm_sampler(fft_length,symbol_length)
-
- self.fg.connect(self.input, self.crosscorr_filter)
- self.fg.connect(self.crosscorr_filter, self.delay)
- self.fg.connect(self.crosscorr_filter, (self.corr,0))
- self.fg.connect(self.delay, self.conjg)
- self.fg.connect(self.conjg, (self.corr,1))
- self.fg.connect(self.corr, self.moving_sum_filter)
- self.fg.connect(self.moving_sum_filter, self.c2mag)
- self.fg.connect(self.moving_sum_filter, self.angle)
- self.fg.connect(self.angle, (self.sample_and_hold,0))
- self.fg.connect(self.sample_and_hold, self.nco)
-
- self.fg.connect(self.input, (self.sigmix,0))
- self.fg.connect(self.nco, (self.sigmix,1))
- self.fg.connect(self.sigmix, (self.sampler,0))
-
- self.fg.connect(self.input, self.inputmag2, self.inputmovingsum)
- self.fg.connect(self.inputmovingsum, (self.square,0))
- self.fg.connect(self.inputmovingsum, (self.square,1))
- self.fg.connect(self.square, (self.normalize,1))
- self.fg.connect(self.c2mag, (self.normalize,0))
- self.fg.connect(self.normalize, self.sub1, self.pk_detect)
-
- self.fg.connect(self.pk_detect, (self.sampler,1))
- self.fg.connect(self.pk_detect, (self.sample_and_hold,1))
-
-
- if 1:
- self.fg.connect(self.normalize, gr.file_sink(gr.sizeof_float,
- "ofdm_sync_pnac-theta_f.dat"))
- self.fg.connect(self.angle, gr.file_sink(gr.sizeof_float,
- "ofdm_sync_pnac-epsilon_f.dat"))
- self.fg.connect(self.pk_detect, gr.file_sink(gr.sizeof_char,
- "ofdm_sync_pnac-peaks_b.dat"))
- self.fg.connect(self.sigmix, gr.file_sink(gr.sizeof_gr_complex,
- "ofdm_sync_pnac-sigmix_c.dat"))
- self.fg.connect(self.sampler, gr.file_sink(gr.sizeof_gr_complex*fft_length,
- "ofdm_sync_pnac-sampler_c.dat"))
- self.fg.connect(self.sample_and_hold, gr.file_sink(gr.sizeof_float,
- "ofdm_sync_pnac-sample_and_hold_f.dat"))
- self.fg.connect(self.nco, gr.file_sink(gr.sizeof_gr_complex,
- "ofdm_sync_pnac-nco_c.dat"))
- self.fg.connect(self.input, gr.file_sink(gr.sizeof_gr_complex,
- "ofdm_sync_pnac-input_c.dat"))
-
- gr.hier_block.__init__(self, fg, self.input, self.sampler)
--
cgit