Channel Coding Techniques for AMR and Its DSP Implementation
Yubing Zhang · Audio Engineering · 2005
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.