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Re: [Discuss-gnuradio] GNU Radio and USRP baseband demodulation/decoding

From: Einar Thorsrud
Subject: Re: [Discuss-gnuradio] GNU Radio and USRP baseband demodulation/decoding
Date: Wed, 11 Feb 2009 16:30:19 +0100
User-agent: Thunderbird (Macintosh/20081209)

Ed Criscuolo wrote:
Once you have the actual binary bitstream, decoding NRZI is easy.
There's a custom block to do this provided in the "GMSK Spacecraft
Groundstation" project in CGRAN:


This project would be good for you to study, as it represents
a real-world application that does something very similar to
what you want, performing both bit and packet synchronization.

Thank you. This was a very interesting project indeed. I will try to reuse as much as possible.

I am also having problems testing the system as I go along. What I would like to do is use a vector sink, and print the received samples to the screen. Hover when I tried initially with only a vector source connected directly to a vector sink, and using the read()-method, only "()" is printed. This seems to be the case no matter where in the code the print statement is issued. (Using "print tb.gr_vector_sink_x_0.data()")

What is wrong? And what would be the easiest way to verify the received samples?

- Einar

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