標題: Precoded multiuser OFDM transceiver in timing asynchronous environment
作者: Tsai, Shang-Ho
Lin, Yuan-Pei
Kuo, C.-C. Jay
電控工程研究所
Institute of Electrical and Control Engineering
關鍵字: 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
公開日期: 1-十月-2007
摘要: 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.
URI: http://dx.doi.org/10.1109/TCOMM.2007.906388
http://hdl.handle.net/11536/10254
ISSN: 0090-6778
DOI: 10.1109/TCOMM.2007.906388
期刊: IEEE TRANSACTIONS ON COMMUNICATIONS
Volume: 55
Issue: 10
起始頁: 1863
結束頁: 1866
顯示於類別:期刊論文


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