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by Dongxu Shen, Student Member, Chuanyi Ji
http://www.rpi.edu/~shend/publications/JSACcapacity2001.pdf
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Abstract:
Abstract-- In this paper, we study the capacity of code-derision multiple-access (CDMA) networks in the support of heterogeneous traffic over fading channels. We first present a CDMA cell model developed in our prior work, which provides a comprehensive yet simple foundation for theoretical analysis. Based on the model, we propose two concepts related to cell capacity: the interference bandwidth and transmission capability. We further point out the cell model is similar to the server model in wireline networks, and a CDMA cell can be viewed as a bufferless server. Such a similarity makes it possible to bring concepts in wireline networks into CDMA. We indeed show the capacity of a CDMA cell can be expressed using effective bandwidth. However, the asymptotic approximations commonly used for the derivation of effective bandwidth are not suitable for CDMA, due to practical considerations. Therefore, we develop accurate and easily calculable approximation techniques for estimating network capacity over large scale fading channels. We then obtain closed form capacity expression for users having heterogeneous traffic and using parallel transmission channels. From our analysis, we show that user bandwidth demand, transmission capability and outage requirement have significant impact on network capacity. The above factors can be traded-off with each other, which is also demonstrated by our numerical results.
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