標題: An approximately MAI-free multiaccess OFDM system in carrier frequency offset environment
作者: Tsai, SH
Lin, YP
Kuo, CCJ
電控工程研究所
Institute of Electrical and Control Engineering
關鍵字: carrier frequency offset (CFO);code selection;frequency synchronization;MAI-free;MC-CDMA;multiuser detection (MUD);multiuser OFDM;OFDMA
公開日期: 1-十一月-2005
摘要: The carrier frequency offset (CFO) effect of a new multiaccess orthogonal frequency division multiplexing (OFDM) transceiver is analyzed. We show that multiaccess interference (MAI) due to CFO can be mitigated by choosing a proper set of orthogonal codes. That is, if we use M/2 symmetric or antisymmetric codewords of the M Hadamard-Walsh codewords, MAI can be greatly reduced to a negligible amount. The new OFDM system has been shown to be approximately MAI-free when there is no CFO. The new result developed here shows that the system continues to be approximately MAI-free even in the presence of CFO. Furthermore, we derive a close form for the reduced MAI, which reveals an interesting property of the system. That is, when the number of users increases, the reduced MAI and the inter carrier interference (ICI) due to self-CFO will decrease. Finally, it is demonstrated by simulation that the proposed OFDM scheme with proper code selection outperforms the OFDMA and the multicarrier code division multiplexing access (MC-CDMA) systems in a CFO environment.
URI: http://dx.doi.org/10.1109/TSP.2005.857059
http://hdl.handle.net/11536/13079
ISSN: 1053-587X
DOI: 10.1109/TSP.2005.857059
期刊: IEEE TRANSACTIONS ON SIGNAL PROCESSING
Volume: 53
Issue: 11
起始頁: 4339
結束頁: 4353
顯示於類別:期刊論文


文件中的檔案:

  1. 000232838900026.pdf