I am testing the gr_mpsk_receiver_cc module using the code attached at
the end.
It is gnuradio v3.3.1git-11-ge20160b7 on cygwin 1.7.5-1 with gcc 3.4.4.
When I run the code, the following error pops up:
===========================
assertion "imu >= 0" failed: file "gri_mmse_fir_interpolator_cc.cc",
line 67, fu
nction: gr_complex gri_mmse_fir_interpolator_cc::interpolate(const
gr_complex*,
float)
Aborted (core dumped)
===========================
Digging into the source code, I found that the interpolator at line 306
of gr_mpsk_receiver_cc.cc return NaN when the inputs are all zeros.
line 306: gr_complex interp_sample =
d_interp->interpolate(&d_dl[d_dl_idx], d_mu);
trying it on ubuntu produced no problem.
Is this an known bug?
Kyle
######## test python script ################
#!/usr/bin/env python
#
from gnuradio import gr
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import os
class my_top_block(gr.top_block):
def __init__(self):
gr.top_block.__init__(self)
parser = OptionParser(option_class=eng_option)
parser.add_option("-i", "--input-file", type="string", default=None,
help="Input file name")
parser.add_option("-o", "--output-file", type="string",
default=None,
help="Output file name")
(options, args) = parser.parse_args ()
if len(args) != 0 or options.input_file==None or
options.output_file==None:
parser.print_help()
raise SystemExit, 1
sinput = gr.file_source(gr.sizeof_short, options.input_file, False)
src = gr.interleaved_short_to_complex()
self.connect(sinput, src)
M=4
theta=0.0
alpha=0.01
beta=alpha*alpha/4.0
fmin=0.0
fmax=1e-4
mu=0.0
gain_mu=0.05
omega=2.2409
gain_omega=omega*omega/4.0
omega_rel=0.005
receiver = gr.mpsk_receiver_cc
(M,theta,alpha,beta,fmin,fmax,mu,gain_mu,omega,gain_omega,omega_rel)
dst = gr.file_sink (gr.sizeof_gr_complex, options.output_file)
self.connect (src, receiver, dst)
if __name__ == '__main__':
try:
my_top_block().run()
except KeyboardInterrupt:
pass
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