diff options
Diffstat (limited to 'gnuradio-examples/python/digital')
| -rw-r--r-- | gnuradio-examples/python/digital/pick_bitrate2.py | 64 | ||||
| -rw-r--r-- | gnuradio-examples/python/digital/usrp_receive_path.py | 19 | ||||
| -rw-r--r-- | gnuradio-examples/python/digital/usrp_transmit_path.py | 16 |
3 files changed, 84 insertions, 15 deletions
diff --git a/gnuradio-examples/python/digital/pick_bitrate2.py b/gnuradio-examples/python/digital/pick_bitrate2.py new file mode 100644 index 000000000..c0188dc3c --- /dev/null +++ b/gnuradio-examples/python/digital/pick_bitrate2.py @@ -0,0 +1,64 @@ +from gnuradio import eng_notation + +def pick_rx_bitrate(bitrate, bits_per_symbol, + converter_rate, possible_decims): + """ + Given the 4 input parameters, return at configuration that matches + + @param bitrate: desired bitrate or None + @type bitrate: number or None + @param bits_per_symbol: E.g., BPSK -> 1, QPSK -> 2, 8-PSK -> 3 + @type bits_per_symbol: integer >= 1 + @param converter_rate: converter sample rate in Hz + @type converter_rate: number + @param possible_decims: a list of possible rates + @type possible_decims: a list of integers + + @returns tuple (bitrate, samples_per_symbol, decim_rate) + """ + + rates = list(possible_decims) + rates.sort() + + for i in xrange(len(rates)): + if((converter_rate / float(bits_per_symbol) / rates[i]) >= 2*bitrate): + decim = rates[i] + else: + break + + sps = converter_rate / float(bits_per_symbol) / decim / bitrate + br = converter_rate / float(bits_per_symbol) / decim / sps + + return (br, sps, int(decim)) + + +def pick_tx_bitrate(bitrate, bits_per_symbol, + converter_rate, possible_interps): + """ + Given the 4 input parameters, return at configuration that matches + + @param bitrate: desired bitrate or None + @type bitrate: number or None + @param bits_per_symbol: E.g., BPSK -> 1, QPSK -> 2, 8-PSK -> 3 + @type bits_per_symbol: integer >= 1 + @param converter_rate: converter sample rate in Hz + @type converter_rate: number + @param possible_interps: a list of possible rates + @type possible_interps: a list of integers + + @returns tuple (bitrate, samples_per_symbol, interp_rate) + """ + + rates = list(possible_interps) + rates.sort() + + for i in xrange(len(rates)): + if((converter_rate / float(bits_per_symbol) / rates[i]) >= 2*bitrate): + interp = rates[i] + else: + break + + sps = converter_rate / float(bits_per_symbol) / interp / bitrate + br = converter_rate / float(bits_per_symbol) / interp / sps + + return (br, sps, int(interp)) diff --git a/gnuradio-examples/python/digital/usrp_receive_path.py b/gnuradio-examples/python/digital/usrp_receive_path.py index 517825cc1..2d3d648a0 100644 --- a/gnuradio-examples/python/digital/usrp_receive_path.py +++ b/gnuradio-examples/python/digital/usrp_receive_path.py @@ -22,7 +22,7 @@ from gnuradio import gr from gnuradio import usrp_options import receive_path -from pick_bitrate import pick_rx_bitrate +from pick_bitrate2 import pick_rx_bitrate from gnuradio import eng_notation def add_freq_option(parser): @@ -81,16 +81,19 @@ class usrp_receive_path(gr.hier_block2): self.rs_rate = options.bitrate if options.verbose: print 'USRP Source:', self.u + + + #(self._bitrate, self._samples_per_symbol, self._decim) = \ + # pick_rx_bitrate(options.bitrate, self._demod_class.bits_per_symbol(), \ + # options.samples_per_symbol, options.decim, adc_rate, \ + # self.u.get_decim_rates()) (self._bitrate, self._samples_per_symbol, self._decim) = \ pick_rx_bitrate(options.bitrate, self._demod_class.bits_per_symbol(), \ - options.samples_per_symbol, options.decim, adc_rate, \ - self.u.get_decim_rates()) + adc_rate, self.u.get_decim_rates()) + + print "USRP Decimation: ", self._decim + print "Samples Per Symbol: ", self._samples_per_symbol - # Calculate resampler rate based on requested and actual rates - self.rs_rate = 1.0 /(self._bitrate / self.rs_rate) - - print "Resampling by %f to get bitrate of %ssps" % ( self.rs_rate, eng_notation.num_to_str(self._bitrate/self.rs_rate)) - self.u.set_decim(self._decim) if not self.u.set_center_freq(options.rx_freq): diff --git a/gnuradio-examples/python/digital/usrp_transmit_path.py b/gnuradio-examples/python/digital/usrp_transmit_path.py index ee63dcd2b..4244c33f2 100644 --- a/gnuradio-examples/python/digital/usrp_transmit_path.py +++ b/gnuradio-examples/python/digital/usrp_transmit_path.py @@ -22,7 +22,7 @@ from gnuradio import gr from gnuradio import usrp_options import transmit_path -from pick_bitrate import pick_tx_bitrate +from pick_bitrate2 import pick_tx_bitrate from gnuradio import eng_notation def add_freq_option(parser): @@ -84,15 +84,17 @@ class usrp_transmit_path(gr.hier_block2): self.rs_rate = options.bitrate # Store requested bit rate if options.verbose: print 'USRP Sink:', self.u + #(self._bitrate, self._samples_per_symbol, self._interp) = \ + # pick_tx_bitrate(options.bitrate, self._modulator_class.bits_per_symbol(), \ + # options.samples_per_symbol, options.interp, dac_rate, \ + # self.u.get_interp_rates()) (self._bitrate, self._samples_per_symbol, self._interp) = \ pick_tx_bitrate(options.bitrate, self._modulator_class.bits_per_symbol(), \ - options.samples_per_symbol, options.interp, dac_rate, \ - self.u.get_interp_rates()) - - # Calculate resampler rate based on requested and actual rates - self.rs_rate = self._bitrate / self.rs_rate - print "Resampling by %f to get bitrate of %ssps" % (self.rs_rate, eng_notation.num_to_str(self._bitrate/self.rs_rate)) + dac_rate, self.u.get_interp_rates()) + print "USRP Interpolation: ", self._interp + print "Samples Per Symbol: ", self._samples_per_symbol + self.u.set_interp(self._interp) self.u.set_auto_tr(True) |