Performance of error protected binary pulse excitation coders at 11.4 kb/s over mobile radio channels

The performance of error protected transformed binary pulse excited (TBPE) coders over Rayleigh fading channels is investigated. The TBPE coder is a stochastically excited linear predictive coding (LPC) coder which produces near-toll quality speech in the vicinity of 8 kb/s utilizing an extremely simple excitation search procedure. A TBPE coder operating at 7.4 kb/s is used, and two methods of embedding channel coding into the speech coder are studied, aiming at the overall bit rate of 11.4 kb/s specified for the half-rate GSM coder. A method of embedding Reed-Solomon codes into speech coding is presented, and it is compared with rate-compatible punctured convolutional (RCPC) codes. Results show the superiority of the proposed scheme over RCPC codes in both performance and implementation simplicity.<<ETX>>

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