Iterative AMR-WB source and channel decoding using differential space-time spreading-assisted sphere-packing modulation

Noor Shamsiah Othman, Mohammed El-Hajjar, Osamah Alamri, Soon Xin Ng, Lajos Hanzo

Research output: Contribution to journalArticle

8 Citations (Scopus)


In this paper, we present a novel system that invokes jointly optimized iterative source and channel decoding for enhancing the error resilience of the adaptive multirate wideband (AMR-WB) speech codec. The resultant AMR-WB-coded speech signal is protected by a recursive systematic convolutional (RSC) code and transmitted using a noncoherently detected multiple-input-multiple-output (MIMO) differential space-time spreading (DSTS) scheme. To further enhance the attainable system performance and to maximize the coding advantage of the proposed transmission scheme, the system is also combined with multidimensional sphere-packing (SP) modulation. Furthermore, the convergence behavior of the proposed scheme is evaluated with the aid of extrinsic information transfer (EXIT) charts. The proposed system exhibits an Eb/N0 gain of about 1 dB, as compared with the benchmark scheme carrying out joint channel decoding and DSTS-aided SP demodulation in conjunction with separate AMR-WB decoding, when using only Isystem = 2 system iterations and when communicating over narrow-band correlated Rayleigh fading channels.

Original languageEnglish
Pages (from-to)484-490
Number of pages7
JournalIEEE Transactions on Vehicular Technology
Issue number1
Publication statusPublished - 12 Feb 2009


All Science Journal Classification (ASJC) codes

  • Automotive Engineering
  • Aerospace Engineering
  • Applied Mathematics
  • Electrical and Electronic Engineering

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