Channel decoding using adaptive interframe and intraframe bit prediction in GSM system
Channel decoding using adaptive interframe and intraframe bit prediction in GSM system
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GSM 系统中使用自适应帧间和帧内比特预测的信道解码
DOI：
10.1109/icassp.2000.860990
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
A. Gilloire
中科院分区：
文献类型：
--
作者：
C. Veaux;P. Scalart;A. Gilloire
信源控制信道解码的目的是利用语音编码数据的剩余冗余来提高信道解码器的性能。原始方法只利用比特之间的帧间相关性，并且为了使用帧内相关性，已经设计了一些简单的方案。在这方面的贡献，我们提出了一种有效的方法来利用帧内相关性在信道解码过程中。我们预测的软值的比特被解码从已经解码的比特沿着的网格路径。我们的比特相关性的估计是自适应估计的软比特值在解码器的输出。最后，将帧间预测和帧内预测相结合应用于GSM系统中的全速率和增强型全速率语音编解码器。
The goal of source controlled channel decoding is to improve the performance of the channel decoder by using the residual redundancy of the speech encoded data. The original approach exploits only the interframe correlation between bits and few simple schemes have been devised in order to use the intraframe correlation. In this contribution, we present an efficient method to exploit the intraframe correlation during the channel decoding process. We predict the soft value of the bit being decoded from the bits already decoded along the trellis path. Our estimator of bit correlation is adaptively estimated from the soft bits values at the decoder output. Finally, the combination of interframe and intraframe prediction is applied to the full-rate and enhanced full-rate speech codecs in the GSM system.