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

[Einar Thorsrud]

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:
>
> https://www.cgran.org/wiki/Projects
>
> 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