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Residual ISI cancellation and EM-based channel estimation for STBC/SFBC OFDM with insufficient cyclic prefix  

Won, Hui-Chul (대구대학교 정보통신대학 컴퓨터.IT공학부)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.32, no.11A, 2007 , pp. 1154-1163 More about this Journal
Abstract
For orthogonal frequency division multiplexing (OFDM), cyclic prefix (CP) should be longer than the length of channel impulse response. In order to prevent a loss of bandwidth efficiency due to the use of a CP, residual intersymbol interference cancellation (RISIC) method has recently been developed. In this paper, we first apply the RISIC algorithm to the space-time block coded (STBC) OFDM and the space-frequency block coded (SFBC) OFDM with insufficient CP. It is shown that in the STBC OFDM, tail cancellation as well as cyclic restoration of the RISIC should be repeated. Second, we propose iterative channel estimation method for the RISIC in the STBC OFDM system with insufficient CP. Based on the expectation-maximization (EM) algorithm, the proposed estimation method exploits the extrinsic probabilities of the channel decoder iteratively. The performance of the proposed method is evaluated by computer simulation in a multipath fading environment.
Keywords
Orthogonal Frequency Division Multiplexing; Residual Intersymbol Interference Cancellation; Channel Estimation; Space-Time Block Code; Space-Frequency Block Code;
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