Robust Audio Coding Over Wireless Channels
In this paper, a concatenated system combining turbo product codes and convolutional codes with soft decision Viterbi decoding algorithm and diversity is proposed to enhance the robustness of Unequal Error Protection (UEP) scheme for wireless transmission of MPEG-4 Advanced Audio Coding. The proposed scheme has been tested over the Gaussian and Rician fading channels. Under severe channels with random, burst and mixed bit error rates (BER) of 6.00 ×10-2 and above, the proposed scheme provides a 90％ improvement in residual BER performance, which is approximately 3 dB, with 19％ increase in bandwidth over the original UEP scheme. At a high channel BER of 6.00 × 10-2, the proposed scheme gives an error-free header frame. Compared with the concatenated convolutional codes, the proposed scheme provides 0.5 dB BER performance improvements with the same bandwidth. With diversity, the performance can be further improved by 3 dB at low SNR for proposed scheme.
Error Protection Tool soft-decision Viterbi decoding Turbo product codes
Yong Zhang YuHong Yang
The National Engineering Research Center for Multimedia Software of Wuhan University
国际会议
武汉
英文
2006-09-01（万方平台首次上网日期，不代表论文的发表时间）