diff options
Diffstat (limited to 'gsm-receiver/src/python')
| -rwxr-xr-x | gsm-receiver/src/python/gsm_receive_usrp2.py | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/gsm-receiver/src/python/gsm_receive_usrp2.py b/gsm-receiver/src/python/gsm_receive_usrp2.py new file mode 100755 index 0000000..a5ca75e --- /dev/null +++ b/gsm-receiver/src/python/gsm_receive_usrp2.py @@ -0,0 +1,148 @@ +#!/usr/bin/env python +#this file isn't ready to use now - gsm-receiver lacks realtime processing capability +#there are many underruns of buffer for samples from usrp's, many blocks of samples get lost and +#receiver isn't prepared for this situation too well + +from gnuradio import gr, gru, blks2 +#, gsm +from gnuradio import usrp2 +from gnuradio.eng_option import eng_option +from optparse import OptionParser +from os import sys + +for extdir in ['../../debug/src/lib','../../debug/src/lib/.libs','../lib','../lib/.libs']: + if extdir not in sys.path: + sys.path.append(extdir) +import gsm + +def pick_subdevice(u): + if u.db[0][0].dbid() >= 0: + return (0, 0) + if u.db[1][0].dbid() >= 0: + return (1, 0) + return (0, 0) + +class tuner(gr.feval_dd): + def __init__(self, top_block): + gr.feval_dd.__init__(self) + self.top_block = top_block + def eval(self, freq_offet): + self.top_block.set_center_frequency(freq_offet) + return freq_offet + +class synchronizer(gr.feval_dd): + def __init__(self, top_block): + gr.feval_dd.__init__(self) + self.top_block = top_block + + def eval(self, timing_offset): + self.top_block.set_timing(timing_offset) + return freq_offet + +class gsm_receiver_first_blood(gr.top_block): + def __init__(self): + gr.top_block.__init__(self) + (options, args) = self._process_options() + self.tuner_callback = tuner(self) + self.synchronizer_callback = synchronizer(self) + self.options = options + self.args = args + self._set_rates() + self.source = self._set_source() + self.filtr = self._set_filter() + self.interpolator = self._set_interpolator() + self.receiver = self._set_receiver() + self.converter = self._set_converter() + self.sink = self._set_sink() + + self.connect(self.source, self.filtr, self.interpolator, self.receiver, self.converter, self.sink) + + def _set_sink(self): + nazwa_pliku_wy = self.options.outputfile + ujscie = gr.file_sink(gr.sizeof_float, nazwa_pliku_wy) + return ujscie + + def _set_source(self): + options = self.options + self.usrp = usrp2.source_32fc(options.interface, options.mac_addr) + self.usrp.set_decim(options.decim) + + # determine the daughterboard subdevice + input_rate = self.usrp.adc_rate() / options.decim + + # set initial values + if options.gain is None: + # if no gain was specified, use the mid-point in dB + g = self.usrp.gain_range() + options.gain = float(g[0]+g[1])/2 + + r = self.usrp.set_center_freq(options.freq) + self.usrp.set_gain(options.gain) + return self.usrp + + def _set_rates(self): + options = self.options + clock_rate = 100e6 + self.clock_rate = clock_rate + self.input_rate = clock_rate / options.decim + self.gsm_symb_rate = 1625000.0 / 6.0 + self.sps = self.input_rate / self.gsm_symb_rate / self.options.osr + + def _set_filter(self): + filter_cutoff = 145e3 + filter_t_width = 10e3 + offset = 0 +# print "input_rate:", self.input_rate, "sample rate:", self.sps, " filter_cutoff:", filter_cutoff, " filter_t_width:", filter_t_width + filter_taps = gr.firdes.low_pass(1.0, self.input_rate, filter_cutoff, filter_t_width, gr.firdes.WIN_HAMMING) + filtr = gr.freq_xlating_fir_filter_ccf(1, filter_taps, offset, self.input_rate) + return filtr + + def _set_converter(self): + v2s = gr.vector_to_stream(gr.sizeof_float, 142) + return v2s + + def _set_interpolator(self): + interpolator = gr.fractional_interpolator_cc(0, self.sps) + return interpolator + + def _set_receiver(self): + receiver = gsm.receiver_cf(self.tuner_callback, self.synchronizer_callback, self.options.osr, "0000000000000000") + return receiver + + def _process_options(self): + parser = OptionParser(option_class=eng_option) + parser.add_option("-e", "--interface", type="string", default="eth0", + help="select Ethernet interface, default is eth0") + parser.add_option("-m", "--mac-addr", type="string", default="", + help="select USRP by MAC address, default is auto-select") + parser.add_option("-d", "--decim", type="int", default=112, + help="Set USRP decimation rate to DECIM [default=%default]") + parser.add_option("-I", "--inputfile", type="string", default="cfile", + help="Input filename") + parser.add_option("-O", "--outputfile", type="string", default="cfile2.out", + help="Output filename") + parser.add_option("-r", "--osr", type="int", default=4, + help="Oversampling ratio [default=%default]") + parser.add_option("-f", "--freq", type="eng_float", default="950.4M", + help="set frequency to FREQ", metavar="FREQ") + parser.add_option("-g", "--gain", type="eng_float", default=None, + help="Set gain in dB (default is midpoint)") + (options, args) = parser.parse_args () + return (options, args) + + def set_center_frequency(self, center_freq): + self.filtr.set_center_freq(center_freq) + + def set_timing(self, timing_offset): + pass + +def main(): + try: + gsm_receiver_first_blood().run() + except KeyboardInterrupt: + pass + +if __name__ == '__main__': + main() + + |