Auto-tuning Fuzzy Power Control for Multi-rate WCDMA Systems

This paper describes an auto-tuning fuzzy power control architecture for the multi-rate WCDMA systems. The auto-tuning fuzzy power control architecture is utilized to adaptively control the transmission power and select the suitable transmission rate for the uplink transmission. Unlike the conventional power control mechanisms, the proposed power control architecture would dynamically adjust the membership function of the fuzzy system by the input signal-to-interference (SIR) error and the error change. The performance of the proposed power control architecture and the conventional selective power control (SPC) method were evaluated by computer simulations. According to the simulation results, the auto-tuning fuzzy power control architecture has a smaller outage probability and a higher average transmission rate than that of the conventional SPC method in a wireless fading channel.