#!/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, ofdm_packet_utils, modulation_utils2 import gnuradio.gr.gr_threading as _threading import psk, qam from gnuradio.blks2impl.ofdm_receiver import ofdm_receiver def _add_common_options(normal, expert): """ Adds OFDM-specific options to the Options Parser that are common both to the modulator and demodulator. """ mods_list = ", ".join(modulation_utils2.type_1_constellations().keys()) print dir(modulation_utils2) print "MODS LIST: ", mods_list print modulation_utils2.type_1_mods() normal.add_option("-m", "--modulation", type="string", default="psk", help="set modulation type (" + mods_list + ") [default=%default]") normal.add_option("-c", "--constellation-points", type="int", default=2, help="set number of constellation points [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]") # ///////////////////////////////////////////////////////////////////////////// # 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 print (options) arity = options.constellation_points 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 print modulation_utils2.type_1_constellations const = modulation_utils2.type_1_constellations()[self._modulation](arity).points() self._pkt_input = gr.ofdm_mapper_bcv(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 """ _add_common_options(normal, expert) for mod in modulation_utils2.type_1_mods().values(): mod.add_options(expert) # 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 arity = options.constellation_points print("con points is %s" % options.constellation_points) # 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) constell = modulation_utils2.type_1_constellations()[self._modulation](arity) phgain = 0.25 frgain = phgain*phgain / 4.0 self.ofdm_demod = gr.ofdm_frame_sink2(constell.base(), 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 """ _add_common_options(normal, expert) for mod in modulation_utils2.type_1_mods().values(): mod.add_options(expert) # 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, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, -1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 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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