Three-Stage Iterative Detection of a MIMO-Aided Precoded AMR-WB Speech Transceiver

Ajointlyoptimisediterativesource and chan- nel decoding (ISCD) scheme invoking the Adaptive Multi RateWideband (AMR-WB)speech codec isproposed. More explicitly, the transceiver investigated consists of serially concatenated Recursive Convolutional (RSC)codes, aUnity Rate Code (URC) referred to as a precoder and the AMR- WB speech codec, where the resultant bitstream is trans- mittedusingDifferential Space-Time Spreading (DSTS) and Sphere Packing (SP) modulation over narrowband tempo- rallycorrelated Rayleigh fading channels. Theconvergence behaviour of the advocated scheme is investigated with the aid of Extrinsic Information Transfer (EXIT) charts, which suggests that potential performance improvements can be achieved by combining a serially concatenated precoder with the AMR-WB speech codec. The proposed system exhibits an Eb/N0 gain of about 1.5 dB in comparison to the benchmark scheme carrying out iterative source- and channel-decoding as well as DSTS aided SP-demodulation, but dispensing with the precoder, when using Isystem =4 system iterations.

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