Iterative AMR-WB Source and Channel Decoding Using Differential Space-Time Spreading-Assisted Sphere-Packing Modulation

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 (RS...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2009-01, Vol.58 (1), p.484-490
Main Authors: Othman, N.S., El-Hajjar, M., Alamri, O., Soon Xin Ng, Hanzo, L.
Format: Article
Language:English
Subjects:
Adaptive multirate wideband (AMR-WB) speech codec
Adaptive systems
Applied sciences
Channels
Coding, codes
Convolution
Convolutional codes
Decoding
Demodulation
differential space-time spreading (DSTS)
Exact sciences and technology
Fading
Information, signal and communications theory
Iterative decoding
Mathematical models
MIMO
Modulation
Modulation, demodulation
Noise levels
Protection
Resilience
Signal and communications theory
Signal processing
soft-bit-based iterative speech decoding
Speech
Speech codecs
Speech coding
Speech processing
sphere decoder
sphere-packing (SP) modulation
System performance
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
three-stage iterative detection
Transmission and modulation (techniques and equipments)
turbo
Wideband
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Summary: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 / N 0 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 I system = 2 system iterations and when communicating over narrow-band correlated Rayleigh fading channels.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2008.924977