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

Over-Complete Source-Mapping Aided AMR-WB Using Iteratively Detected Differential Space-Time Spreading
Over-Complete Source-Mapping Aided AMR-WB Using Iteratively Detected Differential Space-Time Spreading
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.
978-1-4244-2519-8
1-5
Othman, Noor
8c5f8c7c-9618-4a01-8ed3-aaeb06a7641a
El-Hajjar, Mohammed
3a829028-a427-4123-b885-2bab81a44b6f
Pham Quang, Anh
58696985-042b-43ce-97cf-428e0632119c
Alamri, Osamah
292e7399-6cdb-4eb6-b0f4-51f738ea04c1
Ng, Soon
e19a63b0-0f12-4591-ab5f-554820d5f78c
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Othman, Noor
8c5f8c7c-9618-4a01-8ed3-aaeb06a7641a
El-Hajjar, Mohammed
3a829028-a427-4123-b885-2bab81a44b6f
Pham Quang, Anh
58696985-042b-43ce-97cf-428e0632119c
Alamri, Osamah
292e7399-6cdb-4eb6-b0f4-51f738ea04c1
Ng, Soon
e19a63b0-0f12-4591-ab5f-554820d5f78c
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

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. 2010 IEEE 71st Vehicular Technology Conference (VTC 2010-Spring), , Taipei, Taiwan. 16 - 19 May 2010. pp. 1-5 . (doi:10.1109/VETECS.2010.5493798).

Record type: Conference or Workshop Item (Paper)

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.

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Published date: May 2010
Venue - Dates: 2010 IEEE 71st Vehicular Technology Conference (VTC 2010-Spring), , Taipei, Taiwan, 2010-05-16 - 2010-05-19
Organisations: Southampton Wireless Group

Identifiers

Local EPrints ID: 271162
URI: http://eprints.soton.ac.uk/id/eprint/271162
ISBN: 978-1-4244-2519-8
PURE UUID: fbf9ee91-d518-4e54-bf3f-a1aaacaede0c
ORCID for Mohammed El-Hajjar: ORCID iD orcid.org/0000-0002-7987-1401
ORCID for Soon Ng: ORCID iD orcid.org/0000-0002-0930-7194
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 25 May 2010 19:56
Last modified: 18 Mar 2024 03:21

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Contributors

Author: Noor Othman
Author: Mohammed El-Hajjar ORCID iD
Author: Anh Pham Quang
Author: Osamah Alamri
Author: Soon Ng ORCID iD
Author: Lajos Hanzo ORCID iD

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