An EM Algorithm-Based Channel Estimation for OFDM Amplify-and-Forward Relaying Systems

被引：0

作者：

Sheu, Jeng-Shin ^{[1
]}

Sheen, Wern-Ho ^{[2
]}

机构：

[1] Natl Yunlin Univ Sci & Technol, Dept Comp Sci & Informat Engn, Touliu, Yunlin, Taiwan

[2] Chaoyang Univ Technol, Dept Informat & Commun Engn, Taichung 41349, Taiwan

来源：

2010 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS - ICC 2010 | 2010年

关键词：

Channel estimation; amplify-and-forward OFDM relaying systems; expectation maximization algorithm; WIRELESS NETWORKS; COOPERATIVE DIVERSITY; PROTOCOLS;

D O I：

暂无

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：

The issue of channel estimation is investigated for the orthogonal frequency-division multiplexing (OFDM) relaying system with amplify-and-forward (AF) operation mode. Channel estimation in the AF mode is unique in that both the source-to-relay and relay-to-destination channels are needed at the destination in order to perform optimum combining of the received signals from the direct (source-to-destination) and relay paths if a cooperative diversity transmission is employed. Until now, however, there have been only literatures to study the estimation of the composite channel of the relay path. In this work, an iterative expectation-maximization (EM) algorithm-based channel estimation is proposed for respective estimations of the source-to-relay and relay-to-destination links at the destination. Computer simulations show that the iterative channel estimator performs satisfactorily and converges rapidly.

引用

页数：5

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