Precoded multiuser OFDM transceiver in timing asynchronous environment

doi:10.1109/TCOMM.2007.906388

Precoded multiuser OFDM transceiver in timing asynchronous environment

2007-10-01

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DOI：10.1109/TCOMM.2007.906388

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The performance of a multiuser orthogonal frequency-division multiplexing (OFDM) transceiver, called the precoded multiuser OFDM (PMU-OFDM), with time asynchronous access is investigated in this paper. It is shown that multiaccess interference (MAI) due to time asynchronism is asymptotically zero as the number of parallel input symbols N becomes large in the PMU-OFDM system. Then, we show that PMU-OFDM with even or odd Hadamard-Walsh codewords can significantly suppress the MAI effect due to time asynchronism. For the half-loaded case, no sophisticated signal processing technique is needed by PMU-OFDM for MAI, suppression. For the fully loaded situation, PMU-OFDM demands less complexity than does conventional OFDMA for interference suppression since PMU-OFDM deals with only one half of interferers.

Keyword:

code selection

multiaccess interference (MAI) free

multiuser detection

multiuser orthogonal frequency-division multiplexing (OFDM)

orthogonal frequency-division multiple access (OFDMA)

precoded multiuser orthogonal frequency-division multiple (PMU-OFDM)

time offset

Precoded multiuser OFDM transceiver in timing asynchronous environment

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