AMR的信道编码设计及其DSP实现

Channel Coding Techniques for AMR and Its DSP Implementation

对于超短波移动通信系统中AMR语音业务的传输，提出了基于码率兼容的删余卷积码和码率兼容的删余Turbo码这2种可变的不等差错保护信道编码方案。通过设计最优的删余方案和合适的速率匹配方法，这2种不等差错保护方案都可达到类内不等保护的目的，将对具有不同重要性的信源比特的作更精确不等保护。并基于DSP芯片TMS320C6416实时实现了这2种方案对AMR语音的不等差错保护。实验结果表明，这种方法具有合理的系统复杂度和很短的处理延时，适合于语音业务的应用。

In terms of speech transmission over VHF-Mobile radio system, two variable channel-coding schemes with unequal error protection(UEP)are proposed, which are separately based on rate-compatible punctured convolution(RCPC) code scheme and rate-compatible punctured turbo(RCPT) code scheme. With optimum puncturing designation and suitable scheme of rate matching, these two UEP schemes can achieve intra-class unequal error protection, which makes the protection for source bits with different importance more accurate. This paper also presents its real time implementation based on a TMS320C6416 digital signal processor. The experimental results show that this method has reasonable system complexity and short processing delay, and can be turned into practical application in speech service.