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基于迭代结构的联合信源信道GSM语音解码 被引量：2

Iterative Source-Channel Decoding for GSM
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摘要 由于算法复杂度和延迟的限制,语音编码参数仍然保留了一定的冗余信息,这些冗余量表现为参数的非等概分布和时间相关性。该文在比特级上利用信源编码参数的冗余信息在软输入、软输出信道解码和信源参数估计之间进行迭代运算,并将此联合解码算法运用于GSM EFR系统。仿真结果表明此算法降低了编码参数的BER,提高了解码语音的信噪比,具有一定的可行性和有效性。 In speech signal transmission system, residual redundancy is still left in the parameters after source encoding. The redundancy includes non-uniform distribution and time correlation of subsequent frame. Exploiting the redundancy on bit-level, the paper is proposed iterative algorithm based on soft-in/soft-out channel and parameter estimation, and applies the algorithm to GSM EFR system. The result shows this method reduces the BER and improves SNR of decoded speech.
作者 周琳 吴镇扬
机构地区 东南大学无线电工程系
出处 《电子与信息学报》 EI CSCD 北大核心 2005年第6期884-887,共4页 Journal of Electronics & Information Technology
关键词 迭代算法 软输入软输出解码器 参数估计 Iterative decoding, Soft-in/soft-out decoder, Parameter estimation
分类号 TN911.22 [电子电信—通信与信息系统]
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参考文献11

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同被引文献18

  • 1Shannon C E. A mathematical theory of communication [J]. Bell Syst. Tech. J. 1948, 27: 379-423.
  • 2Fingscheidt T, Hindelang T, and Cox R V, etal.. Joint source-channel (de-) coding for mobile communications [J]. IEEE Trans. on Communications, 2002, 50(2): 200-211.
  • 3Hagenauer J. Source-controlled channel decoding[J]. IEEE Trans. on Communications, 1995, 43(9): 2449-2457.
  • 4Fingscheidt T and Vary P. Soft bit speech decoding: A new approach to error concealment[J]. IEEE Trans. on Speech and Audio Processing, 2001, 9(3): 240-251.
  • 5Adart M, Heanel R, and Vary P. On joint source-channel decoding for correlated Source[C]. In Proceedings of ICASSP-02. Orlando, Florida. 2002, 3: 2505-2508.
  • 6Subramaniam A D, Gardner W R, and Rao B D. Iterative joint source-channel decoding of speech spectrum parameters over an additive white Gaussian noise channel [J]. IEEE Trans. on Audio Speech and Language Processing, 2006, 14(1) 152-162.
  • 7Liu Xiaobei and Koh Soo Ngee. Iterative joint source-channel decoding with combined a prior information of source and channel [J]. IEEE Communication Letters, 2005, 9(4): 355-357.
  • 8Cox R V, Kleijn W B, and Kroon P. Robust CELP coders for noisy backgrounds and noisy channels [C]. In the Proceedings of ICASSP'89. Glascow, Scotland, 1989, 2: 739-742.
  • 9Kroon P and Atal B S. Strategies for improving the performance of CELP coders at low rates [C]. In the Proceedings of ICASSP'88. New York, USA, 1988, 1: 151-154.
  • 10Kaindl M and Hindelang T. Estimation of bit error probabilities using a priori information [C]. Proceedings of GLOBECOM'99. Rio de Janeiro, Brazil, 1999, 5: 2422-2426.

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电子与信息学报
2005年 第6期

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