Combined Speech and Channel Coding for Wireless Communications

Authors:
Chung-Hsuan Wang;Chi-Chao Chao
Affiliations:
Department of Electrical Engineering, National Tsing Hua University, Hsinchu, Taiwan;Department of Electrical Engineering, National Tsing Hua University, Hsinchu, Taiwan
Venue:
Wireless Personal Communications: An International Journal
Year:
2001

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Abstract

In this paper, we propose acombined variable-rate code-excited linearly predictive (QCELP)speech coding and unequal error protection (UEP) channel codingsystem for wireless communications. In contrast to theconventional schemes, our system employs a concatenatedsuper-imposed rate-compatible punctured convolutional (SI-RCPC)channel coding scheme which can provide UEP with respect to notonly the bit-significance of speech packets but also the speechactivity and local channel characteristics. Verified by thesimulation results, the combined system achieves an averagetransmission rate less than 8 kb/s as well as an average 2 dBsignal-to-noise ratio (SNR) gain over the conventional equal errorprotection system.