EM-Based Iterative Receivers for OFDM and BICM/OFDM Systems in Doubly Selective Channels

In this paper, we resort to the expectation-maximization (EM) algorithm to tackle the inter-carrier interference (ICI) problem, caused by time-variant multipath channels, for both orthogonal frequency division multiplexing (OFDM) systems and bit-interleaved coded modulation (BICM)/OFDM systems. We f...

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Bibliographic Details
Published in:IEEE transactions on wireless communications 2011-05, Vol.10 (5), p.1405-1415
Main Authors: KU, Meng-Lin, CHEN, Wen-Chuan, HUANG, Chia-Chi
Format: Article
Language:English
Subjects:
Applied sciences
bit-interleaved coded modulation
Channel estimation
Coding, codes
Detection, estimation, filtering, equalization, prediction
Detectors
Equalizers
Exact sciences and technology
expectation-maximization algorithms
Frequency domain analysis
Information, signal and communications theory
inter-carrier interference
Modulation
Modulation, demodulation
Multiplexing
OFDM
Orthogonal frequency division multiplexing
Receivers
Signal and communications theory
Signal, noise
Telecommunications and information theory
turbo receivers
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Summary:In this paper, we resort to the expectation-maximization (EM) algorithm to tackle the inter-carrier interference (ICI) problem, caused by time-variant multipath channels, for both orthogonal frequency division multiplexing (OFDM) systems and bit-interleaved coded modulation (BICM)/OFDM systems. We first analyze the ICI in frequency domain with a reduced set of parameters, and following this analysis, we derive an EM algorithm for maximum likelihood (ML) data detection. An ML-EM receiver for OFDM systems and a TURBO-EM receiver for BICM/OFDM systems are then developed to reduce computational complexity of the EM algorithm and to exploit temporal diversity, the main idea of which is to integrate the proposed EM algorithm with a groupwise ICI cancellation method. Compared with the ML-EM receiver, the TURBO-EM receiver further employs a soft-output Viterbi algorithm (SOVA) decoder to exchange information with a maximum a posteriori (MAP) EM detector through the turbo principle. Computer simulation demonstrates that the two proposed receivers clearly outperform the conventional one-tap equalizer, and the performance of the TURBO-EM receiver is close to the matched-filter bound even at a normalized maximum Doppler frequency (MDF) up to 0.2.
ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2011.030911.090611