Re: [Discuss-gnuradio] Help needed with FPGA

[Brian Padalino]

Something you may want to try to do is focus on the TX side of things.

RX is generally the harder part of radio communications, and probably
wouldn't work out too well inside of an FPGA that is already pretty
full.  TX on the other hand is all just simple permutations, look up
tables, and maybe some filtering to stay within band.

You can probably write a decent M-QAM mapper, convolutional encoder,
interleaver, etc and not have it take up too much room other than some
registers and block rams.  If you wanted to get more complex, a GMSK
mapper might also be interesting.

An interesting consequence of doing this is that your TX bandwidth
goes significantly down since you don't have to pump 16-bit I/Q values
over the bus, just your raw data rate.  This allows for a USRP setup
to both TX and RX to have more USB bandwidth dedicated to the real
processing (RX) and not just some LUTS (TX).

Brian