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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# SPDX-License-Identifier: GPL-3.0
#
# GNU Radio Python Flow Graph
# Title: QAM Sim
# Author: Naoki Sean Pross, Sara Cinzia Halter
# GNU Radio version: 3.8.2.0
from gnuradio import blocks
import numpy
from gnuradio import channels
from gnuradio.filter import firdes
from gnuradio import digital
from gnuradio import gr
import sys
import signal
from argparse import ArgumentParser
from gnuradio.eng_arg import eng_float, intx
from gnuradio import eng_notation
import fadingui
import numpy as np
class qam_sim(gr.top_block):
def __init__(self):
gr.top_block.__init__(self, "QAM Sim")
##################################################
# Variables
##################################################
self.testvec = testvec = [0x1f, 0x35] + [0x12, 0x48]
self.sps = sps = 4
self.nfilts = nfilts = 32
self.excess_bw = excess_bw = 0.35
self.samp_rate = samp_rate = 1e6
self.rrc_taps = rrc_taps = firdes.root_raised_cosine(nfilts, nfilts, 1.0/float(sps), excess_bw, 45*nfilts)
self.qam_const = qam_const = digital.constellation_16qam().base()
self.frame_len = frame_len = len(testvec) +4
self.carrier_freq = carrier_freq = 2.4e9
self.access_code_symbols = access_code_symbols = [(-0.31622776601683794-0.31622776601683794j), (-0.31622776601683794+0.31622776601683794j), (-0.9486832980505138-0.9486832980505138j), (-0.9486832980505138-0.31622776601683794j)]
##################################################
# Blocks
##################################################
self.fadingui_phasecorrection_0 = fadingui.phasecorrection(frame_len)
self.fadingui_netsink_4 = fadingui.netsink(address='udp://localhost:31417', dtype="complex", vlen=1)
self.fadingui_netsink_3 = fadingui.netsink(address='udp://localhost:31419', dtype="complex", vlen=1)
self.fadingui_netsink_1 = fadingui.netsink(address='udp://localhost:31418', dtype="complex", vlen=1)
self.fadingui_netsink_0 = fadingui.netsink(address='udp://localhost:31416', dtype="complex", vlen=1)
self.fadingui_multipath_fading_0 = fadingui.multipath_fading(amplitudes=[0.12], delays=[1.8], los =True)
self.fadingui_ber_0 = fadingui.ber(vgl=testvec + list(np.zeros(4)), vlen=frame_len,address='udp://localhost:31415')
self.digital_pfb_clock_sync_xxx_0 = digital.pfb_clock_sync_ccf(sps, 2 * np.pi / 100, rrc_taps, 32, 16, 1.5, 1)
self.digital_lms_dd_equalizer_cc_0 = digital.lms_dd_equalizer_cc(2, 5e-3, 1, qam_const)
self.digital_corr_est_cc_0 = digital.corr_est_cc(access_code_symbols, 1, len(access_code_symbols) // 2, 0.9, digital.THRESHOLD_ABSOLUTE)
self.digital_constellation_modulator_0 = digital.generic_mod(
constellation=qam_const,
differential=False,
samples_per_symbol=sps,
pre_diff_code=True,
excess_bw=excess_bw,
verbose=False,
log=False)
self.digital_constellation_decoder_cb_0 = digital.constellation_decoder_cb(qam_const)
self.channels_channel_model_0 = channels.channel_model(
noise_voltage=100e-3,
frequency_offset=0,
epsilon=1.0,
taps=[np.exp(1j * 30 / 180 * np.pi)],
noise_seed=243,
block_tags=False)
self.blocks_vector_source_x_0 = blocks.vector_source_b(testvec, True, 1, [])
self.blocks_throttle_0 = blocks.throttle(gr.sizeof_gr_complex*1, samp_rate,True)
self.blocks_tagged_stream_align_0 = blocks.tagged_stream_align(gr.sizeof_char*1, 'frame_start')
self.blocks_stream_to_vector_0 = blocks.stream_to_vector(gr.sizeof_char*1, frame_len)
self.blocks_stream_mux_0 = blocks.stream_mux(gr.sizeof_char*1, [len(testvec), 4, 0])
self.blocks_repack_bits_bb_0 = blocks.repack_bits_bb(2, 8, "", False, gr.GR_LSB_FIRST)
self.blocks_null_source_0 = blocks.null_source(gr.sizeof_char*1)
self.analog_random_source_x_0 = blocks.vector_source_b(list(map(int, numpy.random.randint(0, 255, 400))), True)
##################################################
# Connections
##################################################
self.connect((self.analog_random_source_x_0, 0), (self.blocks_stream_mux_0, 1))
self.connect((self.blocks_null_source_0, 0), (self.blocks_stream_mux_0, 2))
self.connect((self.blocks_repack_bits_bb_0, 0), (self.blocks_stream_to_vector_0, 0))
self.connect((self.blocks_stream_mux_0, 0), (self.digital_constellation_modulator_0, 0))
self.connect((self.blocks_stream_to_vector_0, 0), (self.fadingui_ber_0, 0))
self.connect((self.blocks_tagged_stream_align_0, 0), (self.blocks_repack_bits_bb_0, 0))
self.connect((self.blocks_throttle_0, 0), (self.channels_channel_model_0, 0))
self.connect((self.blocks_vector_source_x_0, 0), (self.blocks_stream_mux_0, 0))
self.connect((self.channels_channel_model_0, 0), (self.fadingui_multipath_fading_0, 0))
self.connect((self.digital_constellation_decoder_cb_0, 0), (self.blocks_tagged_stream_align_0, 0))
self.connect((self.digital_constellation_modulator_0, 0), (self.blocks_throttle_0, 0))
self.connect((self.digital_corr_est_cc_0, 0), (self.fadingui_phasecorrection_0, 0))
self.connect((self.digital_lms_dd_equalizer_cc_0, 0), (self.digital_corr_est_cc_0, 0))
self.connect((self.digital_lms_dd_equalizer_cc_0, 0), (self.fadingui_netsink_1, 0))
self.connect((self.digital_pfb_clock_sync_xxx_0, 0), (self.digital_lms_dd_equalizer_cc_0, 0))
self.connect((self.digital_pfb_clock_sync_xxx_0, 0), (self.fadingui_netsink_4, 0))
self.connect((self.fadingui_multipath_fading_0, 0), (self.digital_pfb_clock_sync_xxx_0, 0))
self.connect((self.fadingui_multipath_fading_0, 0), (self.fadingui_netsink_0, 0))
self.connect((self.fadingui_phasecorrection_0, 0), (self.digital_constellation_decoder_cb_0, 0))
self.connect((self.fadingui_phasecorrection_0, 0), (self.fadingui_netsink_3, 0))
def get_testvec(self):
return self.testvec
def set_testvec(self, testvec):
self.testvec = testvec
self.set_frame_len(len(self.testvec) +4)
self.blocks_vector_source_x_0.set_data(self.testvec, [])
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), self.excess_bw, 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), self.excess_bw, 45*self.nfilts))
def get_excess_bw(self):
return self.excess_bw
def set_excess_bw(self, excess_bw):
self.excess_bw = excess_bw
self.set_rrc_taps(firdes.root_raised_cosine(self.nfilts, self.nfilts, 1.0/float(self.sps), self.excess_bw, 45*self.nfilts))
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_qam_const(self):
return self.qam_const
def set_qam_const(self, qam_const):
self.qam_const = qam_const
def get_frame_len(self):
return self.frame_len
def set_frame_len(self, frame_len):
self.frame_len = frame_len
def get_carrier_freq(self):
return self.carrier_freq
def set_carrier_freq(self, carrier_freq):
self.carrier_freq = carrier_freq
def get_access_code_symbols(self):
return self.access_code_symbols
def set_access_code_symbols(self, access_code_symbols):
self.access_code_symbols = access_code_symbols
self.digital_corr_est_cc_0.set_mark_delay(len(self.access_code_symbols) // 2)
def main(top_block_cls=qam_sim, 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()
tb.wait()
if __name__ == '__main__':
main()
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