Unequal error protection and source-channel decoding of CELP speech
A. Nazer, Fady Alajaji · Electronics Letters · 2002
The reliable communication of FS CELP 1016 encoded speech over very noisy channels is investigated. Using second-order Markov chains it is shown that over one-quarter of the CELP bits in every frame of speech are redundant. An unequal error protection coding scheme, which exploits this residual redundancy, is proposed for sending the CELP parameters over Gaussian and Rayleigh fading channels. Simulations indicate substantial coding gains over conventional systems.