Title :
Over-Complete Source-Mapping Aided AMR-WB Using Iteratively Detected Differential Space-Time Spreading
Author :
Othman, N.S. ; El-Hajjar, M. ; Pham, A.Q. ; Alamri, O. ; Ng, S.X. ; Hanzo, L.
Author_Institution :
Sch. of ECS, Univ. of Southampton, Southampton, UK
Abstract :
The achievable performance of a jointly optimised iterative source and channel decoding (ISCD) arrangement invoking 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.
Keywords :
Rayleigh channels; channel coding; convergence; convolutional codes; iterative decoding; source coding; space-time codes; speech codecs; AMR-WB; DSTS arrangement; RSC code; Rayleigh fading channels; adaptive multirate wideband speech codec; coding rate constant; decoding convergence; extrinsic information transfer charts; iterative source and channel decoding; iteratively detected differential space-time spreading; over-complete source-mapping scheme; recursive systematic convolutional code; sphere packing modulation; Convolutional codes; Fading; Gain; Iterative decoding; Modulation coding; Narrowband; Protection; Speech codecs; System performance; Wideband;
Conference_Titel :
Vehicular Technology Conference (VTC 2010-Spring), 2010 IEEE 71st
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-2518-1
Electronic_ISBN :
1550-2252
DOI :
10.1109/VETECS.2010.5493798