CSI of the guard-band subcarrier in 5G channel

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my ultimate goal is to use 5G toolbox to estimate the compete channel response (for in-band subcarriers & guard-band subcarrier).
This can be done as follows
  1. Generate 20 MHz signal
  2. Use of an array with Nt antennas at TX
  3. Perform perfect channel estimation
I can use the following link to generate 20 MHz signal. But not sure how to check the number of subcarriers or IFFT point
The following link perform perfect channel estimation. But I have question why the number of subcarriers in the channel magnitude response is limited to 300? what about the rest of subcarriers
Is it possible to use 5G toolbox to estimate the compete channel response (for in-band subcarriers & guard-band subcarrier)?

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