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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# SPDX-License-Identifier: GPL-3.0
#
# GNU Radio Python Flow Graph
# Title: QPSK with IMGUI
# Author: Naoki Pross
# GNU Radio version: 3.9.2.0
from gnuradio import blocks
import numpy
from gnuradio import channels
from gnuradio.filter import firdes
from gnuradio import digital
from gnuradio import gr
from gnuradio.fft import window
import sys
import signal
from argparse import ArgumentParser
from gnuradio.eng_arg import eng_float, intx
from gnuradio import eng_notation
class qpsk_nogui(gr.top_block):
def __init__(self):
gr.top_block.__init__(self, "QPSK with IMGUI", catch_exceptions=True)
##################################################
# Variables
##################################################
self.sps = sps = 4
self.nfilts = nfilts = 32
self.timing_loop_bw = timing_loop_bw = 2 * 3.141592653589793 / 100
self.time_offset = time_offset = 1
self.samp_rate = samp_rate = 32000
self.rrc_taps = rrc_taps = firdes.root_raised_cosine(nfilts, nfilts, 1.0/float(sps), 0.35, 45*nfilts)
self.qpsk_const = qpsk_const = digital.constellation_rect([0.707+0.707j, -0.707+0.707j, -0.707-0.707j, 0.707-0.707j], [0, 1, 3, 2],
4, 2, 2, 1, 1).base()
self.phase_bw = phase_bw = 2 * 3.141592653589793 / 100
self.noise_volt = noise_volt = 100e-6
self.freq_offset = freq_offset = 0
self.excess_bw = excess_bw = 350e-3
self.eq_ntaps = eq_ntaps = 15
self.eq_mod = eq_mod = 1
self.eq_gain = eq_gain = .01
self.chn_taps = chn_taps = [1.0 + 0.0j, ]
##################################################
# Blocks
##################################################
self.digital_pfb_clock_sync_xxx_0 = digital.pfb_clock_sync_ccf(sps * 1.001, timing_loop_bw, rrc_taps, nfilts, nfilts/2, 1.5, 2)
self.digital_map_bb_0 = digital.map_bb([0, 1, 3, 2])
self.digital_diff_decoder_bb_0 = digital.diff_decoder_bb(4)
self.digital_costas_loop_cc_0 = digital.costas_loop_cc(phase_bw, 4, False)
self.digital_constellation_modulator_0 = digital.generic_mod(
constellation=qpsk_const,
differential=True,
samples_per_symbol=sps,
pre_diff_code=True,
excess_bw=excess_bw,
verbose=False,
log=False,
truncate=False)
self.digital_constellation_decoder_cb_0 = digital.constellation_decoder_cb(qpsk_const)
self.digital_cma_equalizer_cc_0 = digital.cma_equalizer_cc(eq_ntaps, eq_mod, eq_gain, 2)
self.channels_channel_model_0 = channels.channel_model(
noise_voltage=noise_volt,
frequency_offset=freq_offset,
epsilon=time_offset,
taps=chn_taps,
noise_seed=0,
block_tags=False)
self.blocks_unpack_k_bits_bb_0 = blocks.unpack_k_bits_bb(2)
self.blocks_throttle_0 = blocks.throttle(gr.sizeof_gr_complex*1, samp_rate,True)
self.blocks_null_sink_0 = blocks.null_sink(gr.sizeof_float*1)
self.blocks_char_to_float_0 = blocks.char_to_float(1, 1)
self.analog_random_source_x_0 = blocks.vector_source_b(list(map(int, numpy.random.randint(0, 256, 1000))), True)
##################################################
# Connections
##################################################
self.connect((self.analog_random_source_x_0, 0), (self.digital_constellation_modulator_0, 0))
self.connect((self.blocks_char_to_float_0, 0), (self.blocks_null_sink_0, 0))
self.connect((self.blocks_throttle_0, 0), (self.channels_channel_model_0, 0))
self.connect((self.blocks_unpack_k_bits_bb_0, 0), (self.blocks_char_to_float_0, 0))
self.connect((self.channels_channel_model_0, 0), (self.digital_pfb_clock_sync_xxx_0, 0))
self.connect((self.digital_cma_equalizer_cc_0, 0), (self.digital_costas_loop_cc_0, 0))
self.connect((self.digital_constellation_decoder_cb_0, 0), (self.digital_diff_decoder_bb_0, 0))
self.connect((self.digital_constellation_modulator_0, 0), (self.blocks_throttle_0, 0))
self.connect((self.digital_costas_loop_cc_0, 0), (self.digital_constellation_decoder_cb_0, 0))
self.connect((self.digital_diff_decoder_bb_0, 0), (self.digital_map_bb_0, 0))
self.connect((self.digital_map_bb_0, 0), (self.blocks_unpack_k_bits_bb_0, 0))
self.connect((self.digital_pfb_clock_sync_xxx_0, 0), (self.digital_cma_equalizer_cc_0, 0))
def get_sps(self):
return self.sps
def set_sps(self, sps):
self.sps = sps
self.set_rrc_taps(firdes.root_raised_cosine(self.nfilts, self.nfilts, 1.0/float(self.sps), 0.35, 45*self.nfilts))
def get_nfilts(self):
return self.nfilts
def set_nfilts(self, nfilts):
self.nfilts = nfilts
self.set_rrc_taps(firdes.root_raised_cosine(self.nfilts, self.nfilts, 1.0/float(self.sps), 0.35, 45*self.nfilts))
def get_timing_loop_bw(self):
return self.timing_loop_bw
def set_timing_loop_bw(self, timing_loop_bw):
self.timing_loop_bw = timing_loop_bw
self.digital_pfb_clock_sync_xxx_0.set_loop_bandwidth(self.timing_loop_bw)
def get_time_offset(self):
return self.time_offset
def set_time_offset(self, time_offset):
self.time_offset = time_offset
self.channels_channel_model_0.set_timing_offset(self.time_offset)
def get_samp_rate(self):
return self.samp_rate
def set_samp_rate(self, samp_rate):
self.samp_rate = samp_rate
self.blocks_throttle_0.set_sample_rate(self.samp_rate)
def get_rrc_taps(self):
return self.rrc_taps
def set_rrc_taps(self, rrc_taps):
self.rrc_taps = rrc_taps
self.digital_pfb_clock_sync_xxx_0.update_taps(self.rrc_taps)
def get_qpsk_const(self):
return self.qpsk_const
def set_qpsk_const(self, qpsk_const):
self.qpsk_const = qpsk_const
def get_phase_bw(self):
return self.phase_bw
def set_phase_bw(self, phase_bw):
self.phase_bw = phase_bw
self.digital_costas_loop_cc_0.set_loop_bandwidth(self.phase_bw)
def get_noise_volt(self):
return self.noise_volt
def set_noise_volt(self, noise_volt):
self.noise_volt = noise_volt
self.channels_channel_model_0.set_noise_voltage(self.noise_volt)
def get_freq_offset(self):
return self.freq_offset
def set_freq_offset(self, freq_offset):
self.freq_offset = freq_offset
self.channels_channel_model_0.set_frequency_offset(self.freq_offset)
def get_excess_bw(self):
return self.excess_bw
def set_excess_bw(self, excess_bw):
self.excess_bw = excess_bw
def get_eq_ntaps(self):
return self.eq_ntaps
def set_eq_ntaps(self, eq_ntaps):
self.eq_ntaps = eq_ntaps
def get_eq_mod(self):
return self.eq_mod
def set_eq_mod(self, eq_mod):
self.eq_mod = eq_mod
self.digital_cma_equalizer_cc_0.set_modulus(self.eq_mod)
def get_eq_gain(self):
return self.eq_gain
def set_eq_gain(self, eq_gain):
self.eq_gain = eq_gain
self.digital_cma_equalizer_cc_0.set_gain(self.eq_gain)
def get_chn_taps(self):
return self.chn_taps
def set_chn_taps(self, chn_taps):
self.chn_taps = chn_taps
self.channels_channel_model_0.set_taps(self.chn_taps)
def main(top_block_cls=qpsk_nogui, options=None):
if gr.enable_realtime_scheduling() != gr.RT_OK:
print("Error: failed to enable real-time scheduling.")
tb = top_block_cls()
def sig_handler(sig=None, frame=None):
tb.stop()
tb.wait()
sys.exit(0)
signal.signal(signal.SIGINT, sig_handler)
signal.signal(signal.SIGTERM, sig_handler)
tb.start()
try:
input('Press Enter to quit: ')
except EOFError:
pass
tb.stop()
tb.wait()
if __name__ == '__main__':
main()
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