S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Electrical and Computer Engineering (전기·정보공학부) Others_전기·정보공학부
Pilot Symbol Initiated Iterative Channel Estimation and Decoding for QAM Modulated OFDM Signals
- Kim, Seong-Cheol; Han, Jae Choong; Kim, Yong-Hwa; Lee, Jong-Ho
- Issue Date
- VTC 2003-Spring. The 57th IEEE Semiannual Vehicular Technology Conference, vol. 2, pp. 1322-1326, 2003
- In this papers, we consider the iterative channel estimation and decoding algorithms for quadrature amplitude modulation (QAM) modulated orthogonal frequency division multiplexing (OFDM) signals. We first describe the optimal sequence estimation based on the expectation-maximization(EM) algorithm. Using some approximations, we propose a sub-optimal iterative channel estimation and decoding algorithm, which is shown to have reduced computational complexity. The bit error rate(BER) perfomances of the proposed apgorithm are evaluated using computer simulations. The results show that the proposed algorithm performs nearly as well as the optimal EM algorithm, and outperforms the conventional minimum mean square error (MMSE)estimator.
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