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 |