Hi
I have been working with gnuradio python programs for my project and I am
trying to collect SNR data for the signals I receive using benchmark_rx.py.
I have been dealing with connecting an SNR block in the benchmark_rx.py and
I came across a block called, "gr.probe_mpsk_snr_c(thresh)", which is in the
receive.path.py.
Unfortunately, I am not very familiar with connecting blocks and using them
in gnuradio python programs. I have asked gnuradio people before regarding
connecting a block to collect the data about power of the signal received.
I then received an email explaining to me about doing it by including the
following statements and it worked perfectly.
self.probe = gr.probe_avg_mag_sqrd_cf(thresh,alpha)
self.power_sink = gr.file_sink(gr.sizeof_float, "rxpower.dat")
self.connect(self.probe, self.power_sink) # should dump the power
values in a file.....hopefully....
# Set up receive path
self.rxpath = usrp_receive_path.usrp_receive_path(demodulator,
rx_callback, options)
#connects#
self.connect(self.rxpath)
self.connect(self.rxpath.channel_filter,self.probe)
I was then trying to use the similar list of commands to calculate the SNR
using the block "gr.probe_mpsk_snr_c(thresh)" but it didnt work. I then
tried the following statements,
self.probe = gr.probe_mpsk_snr_c(thresh)
self.rxpath = usrp_receive_path.usrp_receive_path(demodulator,
rx_callback, options)
self.connect(self.rxpath)
self.connect(self.rxpath.channel_filter,self.probe)
But the receiver didnt receive anything properly and it was printing out
weird symbols.
It will be really helpful if someone can explain to me about connecting this
block and measure the SNR.
Thank you
--
Regards
Shantharam Balasubramanian
MS in Electrical and Computer Engineering
Rutgers University
Ph:732-543-6863
Email:shantharam...@gmail.com
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