Iterative MAP multi-user OFDM over rapidly-varying frequency-selective channels

被引:0
|
作者
Ketseoglou, Thomas [1 ]
Tom, Andrew [1 ]
机构
[1] Calif State Polytech Univ Pomona, ECE Dept, 3801 Temple Ave, Pomona, CA 91768 USA
来源
2006 FORTIETH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS AND COMPUTERS, VOLS 1-5 | 2006年
关键词
D O I
10.1109/ACSSC.2006.355066
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper we introduce an Expectation Maximization (EM) based iterative multi-user OFDM detector the detector works in tandem with an a posteriori probability (APP) channel decoder to form a Turbo processor, suitable for use in a rapidly changing multipath fading environment. The system uses spatial diversity at the receiver, by employing a number of uncorrelated (independent) antennas. The normalized Doppler frequencies are in the order of 0.02 to 0.04, i.e. fast changing channel conditions. The system uses a single pilot slot every 10-15 slots, for initial channel estimation (acquisition) per user, so only minimal overhead is required We show that this configuration achieves very high gains first by virtue of the EM detector that simultaneously detects user data and tracks the channel changes, and second by employing the APP decoder, while at the same time it converges very closely to the ideal, perfect channel side information receiver
引用
收藏
页码:1772 / +
页数:2
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