Re: [Discuss-gnuradio] Bitrate doubt

[Tom Rondeau]

Mattias Kjellsson wrote:
> amarnath alapati wrote:
> > hi folks,
> >          I am using BENCHMARK_TX.PY, BENCHMARK_RX.PY to test the 
> > transmission and reception of signals. I have doubts regarding the 
> > outpu that is appearing on the screen.
> >
> > >>> gr_fir_fff: using SSE
> > socket(PF_PACKET, SOCK_RAW, htons(0xBEEF)): Operation not permitted
> > eth0: socket: No such file or directory
> > Requested RX Bitrate: 100k
> > Actual Bitrate: 125k
> > Warning: Failed to enable realtime scheduling.
> >
> > 2) What is the difference between Actual Bitrate and Requested Bitrate
> The actual bit rate is calculated from a couple of parameters, and I 
> think actual bit- rate is "close enough" to the requested one, given 
> that there are some limitations regarding decimation/interpolation 
> rates and so forth...

Yes, right now the code is designed to only allow an integer number of 
samples per symbol and then find the decimation/interpolation rate that 
gets as close to the requested bit rate as it can. We should update the 
code to use the pfb_resampler to allow any requested bitrate.

Tom