ofdm.rar_OFDM系统实现_Python 实现ofdm_gnuradio做ofdm_ofdm系统程序_python o

#!/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. # from gnuradio import gr, blks2 from gnuradio import eng_notation from gnuradio.eng_option import eng_option from optparse import OptionParser import random, time, struct, sys, math, os # from current dir from transmit_path import transmit_path from receive_path import receive_path class my_top_block(gr.top_block): def __init__(self, callback, options): gr.top_block.__init__(self) if not options.channel_off: SNR = 10.0**(options.snr/10.0) power_in_signal = abs(options.tx_amplitude)**2.0 noise_power_in_channel = power_in_signal/SNR noise_voltage = math.sqrt(noise_power_in_channel/2.0) print "Noise voltage: ", noise_voltage frequency_offset = options.frequency_offset / options.fft_length print "Frequency offset: ", frequency_offset if options.multipath_on: taps = [1.0, .2, 0.0, .1, .08, -.4, .12, -.2, 0, 0, 0, .3] else: taps = [1.0, 0.0] else: noise_voltage = 0.0 frequency_offset = 0.0 taps = [1.0, 0.0] symbols_per_packet = math.ceil(((4+options.size+4) * 8) / options.occupied_tones) samples_per_packet = (symbols_per_packet+2) * (options.fft_length+options.cp_length) print "Symbols per Packet: ", symbols_per_packet print "Samples per Packet: ", samples_per_packet if options.discontinuous: stream_size = [100000, int(options.discontinuous*samples_per_packet)] else: stream_size = [0, 100000] z = [0,] self.zeros = gr.vector_source_c(z, True) self.txpath = transmit_path(options) #self.mux = gr.stream_mux(gr.sizeof_gr_complex, stream_size) self.throttle = gr.throttle(gr.sizeof_gr_complex, options.sample_rate) self.channel = blks2.channel_model(noise_voltage, frequency_offset, options.clockrate_ratio, taps) self.rxpath = receive_path(callback, options) #self.connect(self.zeros, (self.mux,0)) #self.connect(self.txpath, (self.mux,1)) #self.connect(self.mux, self.throttle, self.channel, self.rxpath) #self.connect(self.mux, self.throttle, self.rxpath) self.connect(self.txpath, self.throttle, self.channel, self.rxpath) if options.log: self.connect(self.txpath, gr.file_sink(gr.sizeof_gr_complex, "txpath.dat")) #self.connect(self.mux, gr.file_sink(gr.sizeof_gr_complex, "mux.dat")) #self.connect(self.channel, gr.file_sink(gr.sizeof_gr_complex, "channel.dat")) # ///////////////////////////////////////////////////////////////////////////// # main # ///////////////////////////////////////////////////////////////////////////// def main(): global n_rcvd, n_right n_rcvd = 0 n_right = 0 def send_pkt(payload='', eof=False): return tb.txpath.send_pkt(payload, eof) def rx_callback(ok, payload): global n_rcvd, n_right n_rcvd += 1 (pktno,) = struct.unpack('!H', payload[0:2]) if ok: n_right += 1 print "ok: %r \t pktno: %d \t n_rcvd: %d \t n_right: %d" % (ok, pktno, n_rcvd, n_right) printlst = list() for x in payload[2:]: t = hex(ord(x)).replace('0x', '') if(len(t) == 1): t = '0' + t printlst.append(t) printable = ''.join(printlst) print printable print "\n" parser = OptionParser(option_class=eng_option, conflict_handler="resolve") expert_grp = parser.add_option_group("Expert") parser.add_option("-s", "--size", type="eng_float", default=400, help="set packet size [default=%default]") parser.add_option("-M", "--megabytes", type="eng_float", default=1.0, help="set megabytes to transmit [default=%default]") parser.add_option("-r", "--sample-rate", type="eng_float", default=1e5, help="limit sample rate to RATE in throttle (%default)") parser.add_option("", "--snr", type="eng_float", default=30, help="set the SNR of the channel in dB [default=%default]") parser.add_option("", "--frequency-offset", type="eng_float", default=0, help="set frequency offset introduced by channel [default=%default]") parser.add_option("", "--clockrate-ratio", type="eng_float", default=1.0, help="set clock rate ratio (sample rate difference) between two systems [default=%default]") parser.add_option("","--discontinuous", type="int", default=0, help="enable discontinous transmission, burst of N packets [Default is continuous]") parser.add_option("","--channel-off", action="store_true", default=False, help="Turns AWGN, freq offset channel off") parser.add_option("","--multipath-on", action="store_true", default=False, help="enable multipath") transmit_path.add_options(parser, expert_grp) receive_path.add_options(parser, expert_grp) blks2.ofdm_mod.add_options(parser, expert_grp) blks2.ofdm_demod.add_options(parser, expert_grp) (options, args) = parser.parse_args () # build the graph tb = my_top_block(rx_callback, options) r = gr.enable_realtime_scheduling() # if r != gr.RT_OK: # print "Warning: failed to enable realtime scheduling" tb.start() # start flow graph # generate and send packets nbytes = int(1e6 * options.megabytes) n = 0 pktno = 0 pkt_size = int(options.size) while n < nbytes: #r = ''.join([chr(random.randint(0,255)) for i in range(pkt_size-2)]) #pkt_contents = struct.pack('!H', pktno) + r pkt_contents = struct.pack('!H', pktno) + (pkt_size - 2) * chr(pktno & 0xff) send_pkt(pkt_contents) n += pkt_size #sys.stderr.write('.') #if options.discontinuous and pktno % 5 == 4: # time.sleep(1) pktno += 1 send_pkt(eof=True) tb.wait() # wait for it to finish if __name__ == '__main__': try: main() except KeyboardInterrupt: pass