Journal
IEEE TRANSACTIONS ON COMMUNICATIONS
Volume 53, Issue 4, Pages 581-586Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCOMM.2005.844920
Keywords
carrier-frequency offset (CFO); expectation-maximization (EM) algorithm; multiple-input multiple-output (MIMO); orthogonal frequency-division multiplexing (OFDM)
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In this letter, we study the design of expectation-maximization (EM)-based iterative receivers for multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing systems with the presence of carrier-frequency offset (CFO). Motivated by the spirit of maximum-likelihood estimation in the EM algorithm, we first present a pilot-aided CFO estimation scheme that allows fast Fourier transform-based fast implementation. Then this CFO estimation is incorporated into the initialization step of the iterative receiver. Experimental results show the effectiveness of our receiver design in combating CFO.
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