I faced the same issues and my findings on this was: •Empirically: for Reliable transmission 120 Kbps <= Br (data rate) <= 2 Mbps (For GMSK, Pkt. Size = 1500)
•Theoretically: - Maximum Bit rate corresponds to Minimum Decimation Rate and min. samples/symbol value - ADC Sampling Rate = 100 MSamples/Sec - Min. Decimation Factor (D) =4, Min. Samples/Symbol (S) = 2 - Maximum bitrate = ADC rate / (D * S) = 12.5 Mbps However the host computer is not fast enough to generate samples at this rate and therefore the practical max. is limited to 2 - 5 Mbps •Minimum Bit rate corresponds to Max. Interpolation and Max Samples/Sym - DAC Sampling Rate = 400 Msamples/Sec - Max. Interpolation Factor (I) = 512, Max Samples/Symbol (S) = 7 - Minimum bit rate = DAC rate /(I * S) = 111.6 Kbps which more or less confirms with the empirical minimum Srinivas Graduate Student WINLAB, Rutgers University On Sat, Aug 22, 2009 at 2:12 AM, udadidd<[email protected]> wrote: > > hi > I tried setting the bit rate of benchmark_tx/rx below 500k and the receiver > senses no messages below this rate. Is there any specific reason why is it > so? I use xcvr2450 boards. and i transmit at 5.1G. > > Thanks > Udaya > -- > View this message in context: > http://www.nabble.com/Benchmark_tx-rx-does-not-work-below-500k-bitrate-tp25090996p25090996.html > Sent from the GnuRadio mailing list archive at Nabble.com. > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
