how to calculate the length of the time domain samples in nrOFDMModulate

Hello,

I am using the function nrOFDMModulate to generate OFDM modulated waveform.

In the documentation, the details mentioned are as follows (nrOFDMModulate)

[waveform,info] = nrOFDMModulate(carrier,grid)

where, waveform — OFDM modulated waveform, returned as a complex-valued matrix of size T-by-P

• T is the number of time-domain samples in the waveform
• P is the number of transmit antennas.

Here, I would like to know how to calculate the length of T?

Thanks

Answer 1

[Gokul Nath S J]

Hi Sanju,

It seems that you would like to calculate the length of the waveform signal. Please note that the length of 'waveform' will depends on the following parameters.

• FFT Length (Nfft)
• Number of symbols (Nsym)
• Cyclic prefix lengths (CPLEN)

The length of the 'waveform' depends on whether the cpLength is a vector or a scalar.

• If it is a vector, the length of the waveform is equal to (Nfft x Nsym + sum(CPLEN))
• If it is a scalar, the length of the waveform will be (Nfft + CPLEN) x Nsym

I hope it answers your query.

with regards,

Gokul Nath S J

[Sanju Das]

Thanks for the answer.

I have checked it for the case where cpLength is a vector, and the formula is working perfectly for one slot.