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#!/usr/bin/env python
#
# Copyright 2011,2012 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, digital, filter
from gnuradio import eng_notation
from gnuradio.eng_option import eng_option
from optparse import OptionParser
try:
import scipy
except ImportError:
print "Error: could not import scipy (http://www.scipy.org/)"
sys.exit(1)
try:
import pylab
except ImportError:
print "Error: could not import pylab (http://matplotlib.sourceforge.net/)"
sys.exit(1)
from scipy import fftpack
class example_timing(gr.top_block):
def __init__(self, N, sps, rolloff, ntaps, bw, noise,
foffset, toffset, poffset, mode=0):
gr.top_block.__init__(self)
rrc_taps = gr.firdes.root_raised_cosine(
sps, sps, 1.0, rolloff, ntaps)
gain = 2*scipy.pi/100.0
nfilts = 32
rrc_taps_rx = gr.firdes.root_raised_cosine(
nfilts, sps*nfilts, 1.0, rolloff, ntaps*nfilts)
data = 2.0*scipy.random.randint(0, 2, N) - 1.0
data = scipy.exp(1j*poffset) * data
self.src = gr.vector_source_c(data.tolist(), False)
self.rrc = filter.interp_fir_filter_ccf(sps, rrc_taps)
self.chn = filter.channel_model(noise, foffset, toffset)
self.off = filter.fractional_interpolator_cc(0.20, 1.0)
if mode == 0:
self.clk = digital.pfb_clock_sync_ccf(sps, gain, rrc_taps_rx,
nfilts, nfilts//2, 3.5)
self.taps = self.clk.taps()
self.dtaps = self.clk.diff_taps()
self.vsnk_err = gr.vector_sink_f()
self.vsnk_rat = gr.vector_sink_f()
self.vsnk_phs = gr.vector_sink_f()
self.connect((self.clk,1), self.vsnk_err)
self.connect((self.clk,2), self.vsnk_rat)
self.connect((self.clk,3), self.vsnk_phs)
else: # mode == 1
mu = 0.5
gain_mu = 0.1
gain_omega = 0.25*gain_mu*gain_mu
omega_rel_lim = 0.02
self.clk = digital.clock_recovery_mm_cc(sps, gain_omega,
mu, gain_mu,
omega_rel_lim)
self.vsnk_err = gr.vector_sink_f()
self.connect((self.clk,1), self.vsnk_err)
self.vsnk_src = gr.vector_sink_c()
self.vsnk_clk = gr.vector_sink_c()
self.connect(self.src, self.rrc, self.chn, self.off, self.clk, self.vsnk_clk)
self.connect(self.off, self.vsnk_src)
def main():
parser = OptionParser(option_class=eng_option, conflict_handler="resolve")
parser.add_option("-N", "--nsamples", type="int", default=2000,
help="Set the number of samples to process [default=%default]")
parser.add_option("-S", "--sps", type="int", default=4,
help="Set the samples per symbol [default=%default]")
parser.add_option("-r", "--rolloff", type="eng_float", default=0.35,
help="Set the rolloff factor [default=%default]")
parser.add_option("-W", "--bandwidth", type="eng_float", default=2*scipy.pi/100.0,
help="Set the loop bandwidth [default=%default]")
parser.add_option("-n", "--ntaps", type="int", default=45,
help="Set the number of taps in the filters [default=%default]")
parser.add_option("", "--noise", type="eng_float", default=0.0,
help="Set the simulation noise voltage [default=%default]")
parser.add_option("-f", "--foffset", type="eng_float", default=0.0,
help="Set the simulation's normalized frequency offset (in Hz) [default=%default]")
parser.add_option("-t", "--toffset", type="eng_float", default=1.0,
help="Set the simulation's timing offset [default=%default]")
parser.add_option("-p", "--poffset", type="eng_float", default=0.0,
help="Set the simulation's phase offset [default=%default]")
parser.add_option("-M", "--mode", type="int", default=0,
help="Set the recovery mode (0: polyphase, 1: M&M) [default=%default]")
(options, args) = parser.parse_args ()
# Adjust N for the interpolation by sps
options.nsamples = options.nsamples // options.sps
# Set up the program-under-test
put = example_timing(options.nsamples, options.sps, options.rolloff,
options.ntaps, options.bandwidth, options.noise,
options.foffset, options.toffset, options.poffset,
options.mode)
put.run()
if options.mode == 0:
data_src = scipy.array(put.vsnk_src.data()[20:])
data_clk = scipy.array(put.vsnk_clk.data()[20:])
data_err = scipy.array(put.vsnk_err.data()[20:])
data_rat = scipy.array(put.vsnk_rat.data()[20:])
data_phs = scipy.array(put.vsnk_phs.data()[20:])
f1 = pylab.figure(1, figsize=(12,10), facecolor='w')
# Plot the IQ symbols
s1 = f1.add_subplot(2,2,1)
s1.plot(data_src.real, data_src.imag, "bo")
s1.plot(data_clk.real, data_clk.imag, "ro")
s1.set_title("IQ")
s1.set_xlabel("Real part")
s1.set_ylabel("Imag part")
s1.set_xlim([-2, 2])
s1.set_ylim([-2, 2])
# Plot the symbols in time
s2 = f1.add_subplot(2,2,2)
s2.plot(data_src.real, "bo-")
s2.plot(data_clk.real, "ro")
s2.set_title("Symbols")
s2.set_xlabel("Samples")
s2.set_ylabel("Real Part of Signals")
# Plot the clock recovery loop's error
s3 = f1.add_subplot(2,2,3)
s3.plot(data_err)
s3.set_title("Clock Recovery Loop Error")
s3.set_xlabel("Samples")
s3.set_ylabel("Error")
# Plot the clock recovery loop's error
s4 = f1.add_subplot(2,2,4)
s4.plot(data_phs)
s4.set_title("Clock Recovery Loop Filter Phase")
s4.set_xlabel("Samples")
s4.set_ylabel("Filter Phase")
diff_taps = put.dtaps
ntaps = len(diff_taps[0])
nfilts = len(diff_taps)
t = scipy.arange(0, ntaps*nfilts)
f3 = pylab.figure(3, figsize=(12,10), facecolor='w')
s31 = f3.add_subplot(2,1,1)
s32 = f3.add_subplot(2,1,2)
s31.set_title("Differential Filters")
s32.set_title("FFT of Differential Filters")
for i,d in enumerate(diff_taps):
D = 20.0*scipy.log10(abs(fftpack.fftshift(fftpack.fft(d, 10000))))
#D = 20.0*scipy.log10(abs(scipy.fft(d, 10000)))
s31.plot(t[i::nfilts].real, d, "-o")
s32.plot(D)
# If testing the M&M clock recovery loop
else:
data_src = scipy.array(put.vsnk_src.data()[20:])
data_clk = scipy.array(put.vsnk_clk.data()[20:])
data_err = scipy.array(put.vsnk_err.data()[20:])
f1 = pylab.figure(1, figsize=(12,10), facecolor='w')
# Plot the IQ symbols
s1 = f1.add_subplot(2,2,1)
s1.plot(data_src.real, data_src.imag, "o")
s1.plot(data_clk.real, data_clk.imag, "ro")
s1.set_title("IQ")
s1.set_xlabel("Real part")
s1.set_ylabel("Imag part")
s1.set_xlim([-2, 2])
s1.set_ylim([-2, 2])
# Plot the symbols in time
s2 = f1.add_subplot(2,2,2)
s2.plot(data_src.real, "o-")
s2.plot(data_clk.real, "ro")
s2.set_title("Symbols")
s2.set_xlabel("Samples")
s2.set_ylabel("Real Part of Signals")
# Plot the clock recovery loop's error
s3 = f1.add_subplot(2,2,3)
s3.plot(data_err)
s3.set_title("Clock Recovery Loop Error")
s3.set_xlabel("Samples")
s3.set_ylabel("Error")
pylab.show()
if __name__ == "__main__":
try:
main()
except KeyboardInterrupt:
pass
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