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. In, 2010 IEEE 71st Vehicular Technology Conference (VTC 2010-Spring), Taipei, TW, 16 - 19 May 2010. , 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 specific 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)
ISBNs: 9781424425198 (electronic)
9781424425181 (print)
ISSNs: 1550-2252 (print)
Subjects: Q Science > QA Mathematics > QA75 Electronic computers. Computer science
T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > Comms, Signal Processing & Control
ePrint ID: 271162
Date Deposited: 25 May 2010 19:56
Last Modified: 14 Apr 2014 11:33
Research Funder: EPSRC
Projects:
India-UK advanced technology centre
Funded by: EPSRC (EP/J016640/1)
Led by: Lajos Hanzo
1 January 2012 to 30 June 2014
Further Information:Google Scholar
ISI Citation Count:0
URI: http://eprints.soton.ac.uk/id/eprint/271162

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