A near-optimal multiuser joint speech source-channel resource-allocation scheme over downlink CDMA networks

In downlink of code-division multiple-access (CDMA) networks, the maximal number of real-time calls can be increased by smoothly increasing the end-to-end distortions. In this paper, a cross-layer optimization system is developed to control each user's distortion by adapting source coding rates...

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Bibliographic Details
Published in:IEEE transactions on communications 2006-09, Vol.54 (9), p.1682-1692
Main Authors: Zhu Han, Kwasinski, A., Liu, K.J. Ray
Format: Article
Language:English
Subjects:
Access methods and protocols, osi model
Algorithms
Applied sciences
Base stations
Channel coding
Code division multiple access
Coding
Coding, codes
communication networks
communication protocols
Control systems
Distortion
Downlink
Dynamical systems
Dynamics
Exact sciences and technology
Information, signal and communications theory
Multiaccess communication
Networks
Proportional control
Resource management
Signal and communications theory
Source coding
Speech
Speech analysis
speech communication
Studies
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Teleprocessing networks. Isdn
Transmission and modulation (techniques and equipments)
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Summary:In downlink of code-division multiple-access (CDMA) networks, the maximal number of real-time calls can be increased by smoothly increasing the end-to-end distortions. In this paper, a cross-layer optimization system is developed to control each user's distortion by adapting source coding rates, channel coding rates, and transmit powers. In addition, the channel-induced distortion is controlled to be only a small proportion of the total end-to-end distortion, such that the subjective quality of the received signal is high. The formulated problem is to reduce the overall end-to-end distortion in downlink single-cell systems, under the constraints of users' maximal acceptable distortions and maximal total transmit power from the base station. To solve this problem, a near-optimal algorithm is constructed to allocate resources. A performance upper bound is developed and compared with the performance of the proposed algorithm. A dynamic system considering speech activities and different offered loads is also analyzed. From the simulation results, the proposed algorithm significantly reduces distortion and the necessary maximal transmit power when the number of users is large, compared with the traditional voice over CDMA schemes
ISSN:0090-6778
1558-0857
DOI:10.1109/TCOMM.2006.878837