NDLI: Dynamic real time distortion management over multimedia downlink CDMA

Content Provider	IEEE Xplore Digital Library
Author	Kwasinski, A. Han, Z. Liu, K.J.R.
Copyright Year	2004
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Maryland Univ., College Park, MD, USA (Kwasinski, A.; Han, Z.; Liu, K.J.R.)
Abstract	In CDMA networks it is possible to increase the maximum number of users of real time applications by smoothly increasing each end-to-end distortion. We study a protocol for downlink CDMA that allocates source coding rate, channel coding rate and transmitted power based on each user's channel state. The allocation of resources is performed with the constraints of users' maximum distortion and base station's maximum transmitted power in such a way that users operate under carefully controlled distortions. The optimization goal is to minimize the overall distortion in downlink single-cell systems. When the system is highly loaded, the idea for the proposed solution is to initialize the resource allocation with that corresponding to maximum distortion for all users, and then incrementally allocate the remaining transmitted power quota to the user that, at each step, can reduce the distortion with the least use of power. We show that this user must have a high distortion, experience a good channel condition, or generate small interference. We also extend our study to include speech's talk spurt-silence nature and to consider a dynamic model with different offered loads. From simulation results, the proposed algorithm fundamentally reduces the distortions and the necessary maximum transmitted power when the number of users is large, compared with a traditional CDMA scheme (with no distortion control).
Starting Page	2214
Ending Page	2219
File Size	327677
Page Count	6
File Format	PDF
ISBN	0780383443
ISSN	15253511
DOI	10.1109/WCNC.2004.1311431
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-03-21
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Downlink Multiaccess communication Resource management Channel coding Interference Power control Nonlinear distortion Quality of service Educational institutions Application software
Content Type	Text
Resource Type	Article

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