Re: [Discuss-gnuradio] Bitrate doubt

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

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