An EM-based time-domain channel estimation algorithm using a priori information

作者：Yang Feng^*; Zhang Yu; Song Jian; Pan Changyong; Yang Zhixing

来源：IEICE - Transactions on Communications, 2008, E91B(9): 3041-3044.

DOI：10.1093/ietcom/e91-b.9.3041

• time-domain channel estimation
• EM algorithm
• a priori information
• iterative processing

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.

• 出版日期2008-9
• 单位清华大学