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path: root/simulation/QPSK/qpsk_nogui.py
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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()