The MPEG-4 TwinVQ audio codec and the AMR-WB speech codec are investigated in the context of a jointly optimised turbo transceiver capable of providing unequal error protection. The transceiver advocated consists of serially concatenated Space-Time Trellis Coding (STTC), Trellis Coded Modulation (TCM) and two different-rate Non-Systematic Convolutional codes (NSCs) used for unequal error protection. A benchmarker scheme combining STTC and a single-class protection NSC is used for comparison with the proposed scheme. The audio and speech performance of both schemes is evaluated, when communicating over uncorrelated Rayleigh fading channels. An $E_b/N_0$ value of about 2.5 (3.5)~dB is required for near-unimpaired audio (speech) transmission, which is about 3.07 (4.2)~dB from the capacity of the system.
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Othman, N. S., Ng, S. X. and Hanzo, L. (2005) Turbo-Detected Unequal Protection Audio and Speech Transceivers Using Serially Concantenated Convolutional Codes, Trellis Coded Modulation and Space-Time Trellis Coding At IEEE VTC'05 (Fall), United States. 25 - 28 Sep 2005. , pp. 1044-1048.
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