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

Feng YANG  Yu ZHANG  Jian SONG  Changyong PAN  Zhixing YANG  

IEICE TRANSACTIONS on Communications   Vol.E91-B    No.9    pp.3041-3044
Publication Date: 2008/09/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.9.3041
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Broadcast Systems
time-domain channel estimation,  EM algorithm,  a priori information,  iterative processing,  

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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.