期刊
IEEE TRANSACTIONS ON MULTIMEDIA
卷 13, 期 1, 页码 125-131出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMM.2010.2086441
关键词
Code division multiple access (CDMA); convolutional codes; cross-layer; H.264; joint source-channel coding; multimedia communications; power control; resource allocation; spread spectrum; visual sensor network
资金
- Marie Curie International Reintegration Grant within the 7th European Community Framework Programme
In this paper, we propose an approach to manage network resources for a direct sequence code division multiple access (DS-CDMA) visual sensor network where nodes monitor scenes with varying levels of motion. It uses cross-layer optimization across the physical layer, the link layer, and the application layer. Our technique simultaneously assigns a source coding rate, a channel coding rate, and a power level to all nodes in the network based on one of two criteria that maximize the quality of video of the entire network as a whole, subject to a constraint on the total chip rate. One criterion results in the minimal average end-to-end distortion amongst all nodes, while the other criterion minimizes the maximum distortion of the network. Our experimental results demonstrate the effectiveness of the cross-layer optimization.
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