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I am using OFDM reference design.
I want to switch off certain sub-carriers. I am modifying the modulation masks for it.
Please tell me how to change the number of bytes per ofdm symbol. Which variable (in which code) should I modify ?
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The number of full-rate OFDM symbols is calculated in warpmac_prepPhyForXmit(). The code currently assumes 48 data-bearing subcarriers with each subcarrier loaded with BPSK, QPSK or 16-QAM (i.e. 6, 12, or 24 bytes per OFDM symbol).
Let me reiterate how much easier it will be for you to explore this in simulation. We have not tried altering the subcarrier assignment in real-time. It "should" work, but it is much harder to debug in hardware if not. Please look through the PHY simulation and iterate on parameters there before trying it in hardware.
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