Performance of a Prediction Based Closed Loop Power Control Algorithm in WCDMA

In this paper, we present a prediction based closed loop fast transmit power control algorithm on the downlink in wideband CDMA. We use an order predictor to predict the received signal power for comparison with the target received power. We evaluate the performance of the prediction based closed loop power control (CLPC) as a function of mobile speed and propagation and processing delays. We show that the prediction based CLPC performs better than the CLPC without prediction by about 1 dB over a range of mobile speeds of interest. For example, on a flat Rayleigh fading channel, a coded BER of is achieved at an of 4.7 dB with prediction and 5.9 dB without prediction. This improved performance can reduce the interference and hence can increase the CDMA system capacity.