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#!/usr/bin/env python
#
# Copyright 2011 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
from gnuradio import gr, blks2
from gnuradio import eng_notation
import sys
try:
from gnuradio import qtgui
from PyQt4 import QtGui, QtCore
import sip
except ImportError:
print "Error: Program requires PyQt4 and gr-qtgui."
sys.exit(1)
try:
import scipy
except ImportError:
print "Error: Program requires scipy (see: www.scipy.org)."
sys.exit(1)
try:
from qt_digital_window import Ui_DigitalWindow
except ImportError:
print "Error: could not find qt_digital_window.py:"
print "\t\"Please run: pyuic4 qt_digital_window.ui -o qt_digital_window.py\""
sys.exit(1)
class dialog_box(QtGui.QMainWindow):
def __init__(self, snkTx, snkRx, fg, parent=None):
QtGui.QWidget.__init__(self, parent)
self.gui = Ui_DigitalWindow()
self.gui.setupUi(self)
self.fg = fg
self.set_sample_rate(self.fg.sample_rate())
self.set_snr(self.fg.snr())
self.set_frequency(self.fg.frequency_offset())
self.set_time_offset(self.fg.timing_offset())
self.set_gain_mu(self.fg.rx_gain_mu())
self.set_alpha(self.fg.rx_alpha())
# Add the qtsnk widgets to the hlayout box
self.gui.sinkLayout.addWidget(snkTx)
self.gui.sinkLayout.addWidget(snkRx)
# Connect up some signals
self.connect(self.gui.pauseButton, QtCore.SIGNAL("clicked()"),
self.pauseFg)
self.connect(self.gui.sampleRateEdit, QtCore.SIGNAL("editingFinished()"),
self.sampleRateEditText)
self.connect(self.gui.snrEdit, QtCore.SIGNAL("editingFinished()"),
self.snrEditText)
self.connect(self.gui.freqEdit, QtCore.SIGNAL("editingFinished()"),
self.freqEditText)
self.connect(self.gui.timeEdit, QtCore.SIGNAL("editingFinished()"),
self.timeEditText)
self.connect(self.gui.gainMuEdit, QtCore.SIGNAL("editingFinished()"),
self.gainMuEditText)
self.connect(self.gui.alphaEdit, QtCore.SIGNAL("editingFinished()"),
self.alphaEditText)
def pauseFg(self):
if(self.gui.pauseButton.text() == "Pause"):
self.fg.stop()
self.fg.wait()
self.gui.pauseButton.setText("Unpause")
else:
self.fg.start()
self.gui.pauseButton.setText("Pause")
# Accessor functions for Gui to manipulate system parameters
def set_sample_rate(self, sr):
ssr = eng_notation.num_to_str(sr)
self.gui.sampleRateEdit.setText(QtCore.QString("%1").arg(ssr))
def sampleRateEditText(self):
try:
rate = self.gui.sampleRateEdit.text().toAscii()
srate = eng_notation.str_to_num(rate)
self.fg.set_sample_rate(srate)
except RuntimeError:
pass
# Accessor functions for Gui to manipulate channel model
def set_snr(self, snr):
self.gui.snrEdit.setText(QtCore.QString("%1").arg(snr))
def set_frequency(self, fo):
self.gui.freqEdit.setText(QtCore.QString("%1").arg(fo))
def set_time_offset(self, to):
self.gui.timeEdit.setText(QtCore.QString("%1").arg(to))
def snrEditText(self):
try:
snr = self.gui.snrEdit.text().toDouble()[0]
self.fg.set_snr(snr)
except RuntimeError:
pass
def freqEditText(self):
try:
freq = self.gui.freqEdit.text().toDouble()[0]
self.fg.set_frequency_offset(freq)
except RuntimeError:
pass
def timeEditText(self):
try:
to = self.gui.timeEdit.text().toDouble()[0]
self.fg.set_timing_offset(to)
except RuntimeError:
pass
# Accessor functions for Gui to manipulate receiver parameters
def set_gain_mu(self, gain):
self.gui.gainMuEdit.setText(QtCore.QString("%1").arg(gain))
def set_alpha(self, alpha):
self.gui.alphaEdit.setText(QtCore.QString("%1").arg(alpha))
def alphaEditText(self):
try:
alpha = self.gui.alphaEdit.text().toDouble()[0]
self.fg.set_rx_alpha(alpha)
except RuntimeError:
pass
def gainMuEditText(self):
try:
gain = self.gui.gainMuEdit.text().toDouble()[0]
self.fg.set_rx_gain_mu(gain)
except RuntimeError:
pass
class my_top_block(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
self.qapp = QtGui.QApplication(sys.argv)
self._sample_rate = 2000e3
self.sps = 2
self.excess_bw = 0.35
self.gray_code = True
fftsize = 2048
self.data = scipy.random.randint(0, 255, 1000)
self.src = gr.vector_source_b(self.data.tolist(), True)
self.mod = blks2.dqpsk_mod(self.sps, self.excess_bw, self.gray_code, False, False)
self.rrctaps = gr.firdes.root_raised_cosine(1, self.sps, 1, self.excess_bw, 21)
self.rx_rrc = gr.fir_filter_ccf(1, self.rrctaps)
# Set up the carrier & clock recovery parameters
self.arity = 4
self.mu = 0.5
self.gain_mu = 0.05
self.omega = self.sps
self.gain_omega = .25 * self.gain_mu * self.gain_mu
self.omega_rel_lim = 0.05
self.alpha = 0.15
self.beta = 0.25 * self.alpha * self.alpha
self.fmin = -1000/self.sample_rate()
self.fmax = 1000/self.sample_rate()
self.receiver = gr.mpsk_receiver_cc(self.arity, 0,
self.alpha, self.beta,
self.fmin, self.fmax,
self.mu, self.gain_mu,
self.omega, self.gain_omega,
self.omega_rel_lim)
self.snr_dB = 15
noise = self.get_noise_voltage(self.snr_dB)
self.fo = 100/self.sample_rate()
self.to = 1.0
self.channel = gr.channel_model(noise, self.fo, self.to)
self.thr = gr.throttle(gr.sizeof_char, self._sample_rate)
self.snk_tx = qtgui.sink_c(fftsize, gr.firdes.WIN_BLACKMAN_hARRIS,
0, self._sample_rate*self.sps,
"Tx", True, True, True, True)
self.snk_rx = qtgui.sink_c(fftsize, gr.firdes.WIN_BLACKMAN_hARRIS,
0, self._sample_rate,
"Rx", True, True, True, True)
self.connect(self.src, self.thr, self.mod, self.channel, self.snk_tx)
self.connect(self.channel, self.rx_rrc, self.receiver, self.snk_rx)
pyTxQt = self.snk_tx.pyqwidget()
pyTx = sip.wrapinstance(pyTxQt, QtGui.QWidget)
pyRxQt = self.snk_rx.pyqwidget()
pyRx = sip.wrapinstance(pyRxQt, QtGui.QWidget)
self.main_box = dialog_box(pyTx, pyRx, self);
self.main_box.show()
def get_noise_voltage(self, SNR):
S = 0 # dBm, assuming signal power normalized
N = S - SNR # dBm
npwr = pow(10.0, N/10.0) # ratio
nv = scipy.sqrt(npwr * self.sps) # convert the noise voltage
return nv
# System Parameters
def sample_rate(self):
return self._sample_rate
def set_sample_rate(self, sr):
self._sample_rate = sr
# Channel Model Parameters
def snr(self):
return self.snr_dB
def set_snr(self, snr):
self.snr_dB = snr
noise = self.get_noise_voltage(self.snr_dB)
self.channel.set_noise_voltage(noise)
def frequency_offset(self):
return self.fo * self.sample_rate()
def set_frequency_offset(self, fo):
self.fo = fo / self.sample_rate()
self.channel.set_frequency_offset(self.fo)
def timing_offset(self):
return self.to
def set_timing_offset(self, to):
self.to = to
self.channel.set_timing_offset(self.to)
# Receiver Parameters
def rx_gain_mu(self):
return self.gain_mu
def rx_gain_omega(self):
return self.gain_omega
def set_rx_gain_mu(self, gain):
self.gain_mu = gain
self.gain_omega = .25 * self.gain_mu * self.gain_mu
self.receiver.set_gain_mu(self.gain_mu)
self.receiver.set_gain_omega(self.gain_omega)
def rx_alpha(self):
return self.alpha
def rx_beta(self):
return self.beta
def set_rx_alpha(self, alpha):
self.alpha = alpha
self.beta = .25 * self.alpha * self.alpha
self.receiver.set_alpha(self.alpha)
self.receiver.set_beta(self.beta)
if __name__ == "__main__":
tb = my_top_block();
tb.start()
tb.qapp.exec_()
tb.stop()
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