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Power control is an important issue in a DS-CDMA cellular radio system. A high system capacity could not be achieved for such a system unless a power control mechanism is employed in the system. In past works, the fixed-step strength-based and SIR-based power control mechanism on the uplink communication were studied, by simulation analysis. This thesis extend the study to the variable-step strength-based as well as the SIR-based power control mechanisms. A novel method of simulating the short-term fading signal is proposed to save the simulation time. From the simulation results, we find that the variable-step power control could achieve a lower outage probability than the fixed-step power control could do.
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