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An EM-based channel estimation algorithm for OFDM with transmitter diversity

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2 Author(s)
Xie, Yongzhe ; Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA ; Georghiades, C.

We study channel estimation for OFDM systems utilizing transmitter diversity and operating over multipath fading channels. An expectation-maximization (EM) based estimation algorithm is introduced and compared to least-squares based estimation algorithms. At each iteration and for every OFDM link, the EM algorithm partitions the problem of estimating a multi-input channel into independent channel estimations for each transmit-receive antenna pair. It is shown that the EM algorithm is more robust to multipath channel delay profile variations and can be implemented more efficiently compared to a previously proposed algorithm

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Global Telecommunications Conference, 2001. GLOBECOM '01. IEEE  (Volume:2 )

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