Novel predictive power control in a CDMA mobile radio system

A novel prediction-based decisive power control algorithm has been proposed in the reverse link of a CDMA mobile radio system. An adaptive transversal filter, with the tap weights updated using the recursive least-squares (RLS) algorithm, is constructed to predict the power gain in the next power measurement period. With two different measurement periods defined, the power gain in the next power control period is then predicted. Based on the predicted power gains, five signal-to-interference power ratio (SIR) estimation-based decision rules have been proposed to determine the power control commands for the mobiles. The novel algorithm has been observed to accomplish a lower outage probability when compared with the conventional power control algorithm with optimum power control threshold. Moreover, the effects of the number of measurement periods used for prediction, the mobile speeds, the prediction methods and the decision algorithms have been examined.