Over-Complete Source-Mapping Aided AMR-WB Using Iteratively Detected Differential Space-Time Spreading


Othman, Noor, El-Hajjar, Mohammed, Pham Quang, Anh, Alamri, Osamah, Ng, Soon and Hanzo, Lajos (2010) Over-Complete Source-Mapping Aided AMR-WB Using Iteratively Detected Differential Space-Time Spreading At 2010 IEEE 71st Vehicular Technology Conference (VTC 2010-Spring), Taiwan, Province of China. 16 - 19 May 2010. , pp. 1-5. (doi:10.1109/VETECS.2010.5493798).

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Description/Abstract

The achievable performance of a jointly optimised iterative source and channel decoding (ISCD) arrangement in-voking the Adaptive MultiRate Wideband (AMR-WB) speech codec is characterized, which exploits the intentional redundancy imposed by the proposed Over-Complete source-Mapping (OCM) scheme. The resultant OCM-aided AMR-WB bitstream is protected by a Recursive Systematic Convolutional (RSC) code and mapped to a Differential Space-Time Spreading (DSTS) arrangement using Sphere Packing (SP) modulation for transmission over narrowband temporally correlated Rayleigh fading channels. The effect of appropriately apportioning the total amount of redundancy between the source and channel codecs on the attainable system performance is demonstrated, while keeping the overall coding rate constant. The decoding convergence of the proposed scheme is studied with the aid of Extrinsic Information Transfer (EXIT) charts. Explicitly, our experimental results show that the speci?c scheme using a 2/3-rate channel encoder and a 3/4-rate OCM scheme exhibits an Eb /N0 gain of 0.7 dB at the SegSNR degradation point of 1 dB, when compared to the system that assigns all the redundancy to the OCM scheme. By contrast, the scheme using a 3/4-rate channel encoder and a 8/9-rate OCM results in an Eb /N0 gain of 1.0 dB.

Item Type: Conference or Workshop Item (Paper)
Digital Object Identifier (DOI): doi:10.1109/VETECS.2010.5493798
Venue - Dates: 2010 IEEE 71st Vehicular Technology Conference (VTC 2010-Spring), Taiwan, Province of China, 2010-05-16 - 2010-05-19
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Organisations: Southampton Wireless Group
ePrint ID: 271162
Date :
Date Event
May 2010Published
Date Deposited: 25 May 2010 19:56
Last Modified: 17 Apr 2017 18:21
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/271162

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