Abstract
A trellis decoder which incorporates the residual redundancy in low bit rate speech coder parameters is used to decode Reed Solomon (RS) codes. As not all the transmitted speech parameters and bits are equally sensitive to errors, unequal error protection has been employed to enhance speech quality. Subcodes of RS codes, which have been introduced by Shin and Sweeney (1995), are used for this purpose. A trellis decoding method is tailored to combat bursty errors in a mobile communication channel. Simulation results on a land mobile channel show a noticeable increase in performance and computational efficiency of the decoder.
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