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

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Sanju Das
Sanju Das 2023-5-17
编辑： Sanju Das 2023-5-24
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

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Gokul Nath S J
Gokul Nath S J 2023-5-23
编辑：Gokul Nath S J 2023-5-24
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
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Sanju Das
Sanju Das 2023-5-24
编辑：Sanju Das 2023-5-24
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.

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