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OFDMA requires modulation of multiple sets of information across all the available sub-carriers. Currently, I think I know how to construct a packet with two or more sets of information by carefully organizing the bit order. However, this process is time-consuming which requires bit operation for all the information. I am afraid that it will affect the performance of package sending and receiving from both ethernet and the air.
I remember that there is a mask to enable/disable subcarriers. Can I implement OFDMA by altering masks? Now it seems that the subcarrier modulation and the transmission happen together. Is there a way to make WARP repeat the subcarrier modulation using different masks and then send the whole packet out?
Thanks.
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The OFDM Tx operates as a long pipeline, continuously reading bytes, modulating them, taking IFFT's and sending I/Q samples to the radio. The output waveform is never stored completely- it is calculated and transmitted on the fly.
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