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Joint iterative detection and decoding in the presence of phase noise and frequency offset

IEEE TRANSACTIONS ON COMMUNICATIONS 2007年第1期55卷 171-179页

作者： Barbieri, Alan Colavolpe, Giulio Caire, Giuseppe Univ Parma Dept Informat Engn I-43100 Parma Italy Univ So Calif Viterbi Sch Engn Dept Elect Engn Los Angeles CA 90089 USA

We present a new algorithm for joint detection and decoding of iteratively decodable codes transmitted over channels affected by a time-varying phase noise (PN) and a constant frequency offset. The proposed algorithm is obtained as an application of the sum-product algorithm to the factor graph representing the joint a posteriori distribution of the information symbols and the channel parameters given the channel output. The resulting algorithm employs the soft-output information on the coded symbols provided by the decoder and performs forward-backward recursions, taking into account the joint probability distribution of phase and frequency offset. We present simulation results for high-order coded modulation schemes based on low-density parity-check codes and serially concatenated convolutional codes, showing that, despite its low complexity, the algorithm is able to cope with a strong PN and a significant uncompensated frequency offset, thus avoiding the use of complicated data-aided frequency-estimation schemes operating on a known preamble. The robustness of the algorithm in the presence of a time-varying frequency offset is also discussed.

关键词： detection and decoding in the presence of phase noise and frequency offset factor graphs (FGs) iterative detection and decoding low-density parity-check (LDPC) codes serially concatenated convolutional codes (SCCCs) sum-product algorithm (SPA) turbo codes (TCs)

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Joint iterative detection and decoding in the presence of phase noise and frequency offset

Joint iterative detection and decoding in the presence of ph...

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IEEE International Conference on Communications (ICC 2005)

作者： Barbieri, Alan Colavolpe, Giulio Caire, Giuseppe Univ Parma Dept Informat Engn I-43100 Parma Italy Univ So Calif Viterbi Sch Engn Dept Elect Engn Los Angeles CA 90089 USA

ISBN: (纸本)0780389387

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