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Precoded Multiuser OFDM Transceiver in Timing Asynchronous Environment

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3 Author(s)
Shang-Ho Tsai ; Nat. Chiao Tung Univ., Hsinchu ; Yuan-Pei Lin ; C. -C. Jay Kuo

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.

Published in:

IEEE Transactions on Communications  (Volume:55 ,  Issue: 10 )