Hello Reza,
It is not possible to directly generate the waveform at a different sampling rate, but it should be very easy to perform resampling using the MATLAB resample() function as follows:
>> ue.NULRB = 75;
>> prach.Format = 0;
>> waveform = ltePRACH(ue,prach);
>> waveform = resample(waveform,23040,30720);
>> size(waveform)
ans =
23040 1
For information, the reason we use 30.72 Ms/s is for compatibility with our normal uplink waveforms created using lteSCFDMAModulate.
Regards,
Iain.
