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Diffstat (limited to 'gr-digital/python/ofdm.py')
| -rw-r--r-- | gr-digital/python/ofdm.py | 318 |
1 files changed, 318 insertions, 0 deletions
diff --git a/gr-digital/python/ofdm.py b/gr-digital/python/ofdm.py new file mode 100644 index 000000000..9f57920ef --- /dev/null +++ b/gr-digital/python/ofdm.py @@ -0,0 +1,318 @@ +#!/usr/bin/env python +# +# Copyright 2006,2007,2008 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 +import digital_swig +import ofdm_packet_utils +from ofdm_receiver import ofdm_receiver +import gnuradio.gr.gr_threading as _threading +import psk, qam + +# ///////////////////////////////////////////////////////////////////////////// +# 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,) + + 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) + + # FIXME: pass the constellation objects instead of just the points + if(self._modulation.find("psk") >= 0): + constel = psk.psk_constellation(arity) + rotated_const = map(lambda pt: pt * rot, constel.points()) + elif(self._modulation.find("qam") >= 0): + constel = qam.qam_constellation(arity) + rotated_const = map(lambda pt: pt * rot, constel.points()) + #print rotated_const + self._pkt_input = digital_swig.ofdm_mapper_bcv(rotated_const, + msgq_limit, + options.occupied_tones, + options.fft_length) + + self.preambles = digital_swig.ofdm_insert_preamble(self._fft_length, + padded_preambles) + self.ifft = gr.fft_vcc(self._fft_length, False, win, True) + self.cp_adder = digital_swig.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 + 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,) + + 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) + + # FIXME: pass the constellation objects instead of just the points + if(self._modulation.find("psk") >= 0): + constel = psk.psk_constellation(arity) + rotated_const = map(lambda pt: pt * rot, constel.points()) + elif(self._modulation.find("qam") >= 0): + constel = qam.qam_constellation(arity) + rotated_const = map(lambda pt: pt * rot, constel.points()) + #print rotated_const + + phgain = 0.25 + frgain = phgain*phgain / 4.0 + self.ofdm_demod = digital_swig.ofdm_frame_sink(rotated_const, range(arity), + self._rcvd_pktq, + self._occupied_tones, + phgain, frgain) + + 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]") + expert.add_option("", "--snr", type="float", default=30.0, + help="SNR estimate [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_4512_3 = [-1, -1, 1, -1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, 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