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Performance analysis of a CDMA ALOHA network with channel-sensing

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3 Author(s)
F. L. Lo ; Dept. of Electr. & Electron. Eng., Hong Kong Univ., Hong Kong ; T. S. Ng ; T. I. Yuk

It has been shown by Lo, Ng and Yuk (see IEEE JSAC issue on CDMA Networks III, 1996) that the throughput-delay performance of a CDMA ALOHA network, where each station is assigned a spreading code so that each effectively has its own `virtual channel', and where channel sensing and collision detection are also used, is much better than that of a simple CSMA-CD network. Such a system, however, is difficult to implement. A simpler system that may provide good performance and that is easy to implement is a CDMA ALOHA network with just channel sensing. The channel sensing can be provided by a simple correlator and threshold device. The performance of such a network is investigated, and some comparisons are made with those of the simple CSMA-CD network and the CDMA ALOHA network with both channel sensing and collision detection. It is shown that when the CDMA-CS network is stable, its performance is not much worse than that of a CDMA-CS/CD network, and much better than that of a simple single channel CSMA-CD system

Published in:

Spread Spectrum Techniques and Applications Proceedings, 1996., IEEE 4th International Symposium on  (Volume:3 )

Date of Conference:

22-25 Sep 1996