TAILIEUCHUNG - Báo cáo hóa học: " Soft and Joint Source-Channel Decoding of Quasi-Arithmetic Codes"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Soft and Joint Source-Channel Decoding of Quasi-Arithmetic Codes | EURASIP Journal on Applied Signal Processing 2004 3 393-411 2004 Hindawi Publishing Corporation Soft and Joint Source-Channel Decoding of Quasi-Arithmetic Codes Thomas Guionnet Projet TEMICS IRISA-INRIA Campus Universitaire de Beaulieu 35042 Rennes Cedex France Email Christine Guillemot Projet TEMICS IRISA-INRIA Campus Universitaire de Beaulieu 35042 Rennes Cedex France Email Received 20 November 2002 Revised 7 August 2003 Recommended for Publication by Antonio Ortega The issue of robust and joint source-channel decoding of quasi-arithmetic codes is addressed. Quasi-arithmetic coding is a reduced precision and complexity implementation of arithmetic coding. This amounts to approximating the distribution of the source. The approximation of the source distribution leads to the introduction of redundancy that can be exploited for robust decoding in presence of transmission errors. Hence this approximation controls both the trade-off between compression efficiency and complexity and at the same time the redundancy excess rate introduced by this suboptimality. This paper provides first a state model of a quasi-arithmetic coder and decoder for binary and M-ary sources. The design of an error-resilient soft decoding algorithm follows quite naturally. The compression efficiency of quasi-arithmetic codes allows to add extra redundancy in the form of markers designed specifically to prevent desynchronization. The algorithm is directly amenable for iterative source-channel decoding in the spirit of serial turbo codes. The coding and decoding algorithms have been tested for a wide range of channel signal-to-noise ratios SNRs . Experimental results reveal improved symbol error rate SER and SNR performances against Huffman and optimal arithmetic codes. Keywords and phrases robust arithmetic and quasi-arithmetic coding joint source-channel coding soft decoding estimation mAp. 1. INTRODUCTION Entropy coding producing variable .

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