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An EM-Based Time-Domain Channel Estimation Algorithm Using a priori Information

Feng YANG, Yu ZHANG, Jian SONG, Changyong PAN, Zhixing YANG

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Summary :

Based on the expectation-maximization (EM) algorithm, an iterative time-domain channel estimation approach capable of using a priori information is proposed for orthogonal frequency division multiplexing (OFDM) systems in this letter: it outperforms its noniterative counterpart in terms of estimation accuracy as well as bit error rate (BER) performance. Numerical simulations demonstrate that an SNR gain of 1 dB at BER=10-4 with only one iteration and estimation mean square error (MSE) which nearly coincides with the Cramer-Rao bound (CRB) in the low SNR region can be obtained, thanks to the efficient use of a priori information.

Publication
IEICE TRANSACTIONS on Communications Vol.E91-B No.9 pp.3041-3044
Publication Date
2008/09/01
Publicized
Online ISSN
1745-1345
DOI
10.1093/ietcom/e91-b.9.3041
Type of Manuscript
LETTER
Category
Broadcast Systems

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