A joint channel estimation and detection for frequency-domain equalization using an approximate EM algorithm

Authors:
Jinho Choi
Affiliations:
School of Electrical Engineering and Telecommunications, The University of New South Wales, Sydney, NSW 2052, Australia
Venue:
Signal Processing
Year:
2004

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Abstract

For orthogonal frequency division multiplexing (OFDM) and block-based single-carrier transmission with cyclic prefix (SCCP), the joint channel estimation and data detection in the frequency-domain has been considered with the expectation-maximization (EM) algorithm. While the computational complexity of the EM algorithm is reasonable in OFDM, it becomes prohibitively high in SCCP. Hence, we propose an approximate EM algorithm to reduce the complexity in this paper. It is shown that the channel estimation accuracy has been improved due to the joint processing and thereby the bit error rate (BER) is also improved.