WARP Project Forums - Wireless Open-Access Research Platform

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#1 2010-Jun-17 16:43:49

Gallon
Member
From: SMU
Registered: 2010-Feb-04
Posts: 37

Is there a faster way to construct packets to implement OFDMA?

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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#2 2010-Jun-21 19:58:02

murphpo
Administrator
From: Mango Communications
Registered: 2006-Jul-03
Posts: 5159

Re: Is there a faster way to construct packets to implement OFDMA?

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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