Over-complete source-mapping aided AMR-WB using iteratively detected differential space-time spreading

N. S. Othman, M. El-Hajjar, A. Q. Pham, O. Alamri, S. X. Ng, L. Hanzo

Research output: Chapter in Book/Report/Conference proceedingConference contribution


The achievable performance of a jointly optimized iterative source and channel decoding (ISCD) arrangement invoking the Adaptive MultiRateWideband (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 E b/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.

Original languageEnglish
Title of host publication2010 IEEE 71st Vehicular Technology
Publication statusPublished - 30 Jul 2010
Event2010 IEEE 71st Vehicular Technology Conference, VTC 2010-Spring - Taipei, Taiwan, Province of China
Duration: 16 May 201019 May 2010

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252


Other2010 IEEE 71st Vehicular Technology Conference, VTC 2010-Spring
CountryTaiwan, Province of China


All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics

Cite this

Othman, N. S., El-Hajjar, M., Pham, A. Q., Alamri, O., Ng, S. X., & Hanzo, L. (2010). Over-complete source-mapping aided AMR-WB using iteratively detected differential space-time spreading. In 2010 IEEE 71st Vehicular Technology [5493798] (IEEE Vehicular Technology Conference). https://doi.org/10.1109/VETECS.2010.5493798