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Performance and Capacity Enhancement Techniques of WCDMA Systems for Data Users


Ehab H. Abdelhay, Fayz W. Zaki


Vol. 10  No. 4  pp. 94-103


One of the principle characteristics of CDMA and WCDMA systems is that its capacity is a function of total interference experienced by the network. The most common approaches investigated in this paper to enhance the system capacity are: Wideband CDMA, Power control accuracy, interference power, Frequency reuse, cell sectoring, power based call admission control, and etc. Since CDMA is interference limited system, the uplink signal-to-interference (SIR) is used in evaluating system capacity with each of the previous techniques under different environmental conditions, e.g., AWGN and Rayleigh fading using Perfect Power Control (PPC) and IPC. These techniques enhanced the WCDMA system capacity with high QoS. All other studies concerned with speech users but this study is concerned with data users. Data transmission use higher data rates than speech transmission so for the same bandwidth the total system capacity for data users will be less than it for speech users.


CDMA, WCDMA, Mobile communications, CDMA Uplink Capacity, Call Admission Control (CAC)