基于自适应多步预测的前向链路功率控制算法

Adaptive Algorithm of Forward Link Power Control Based on Mult Step Forecast

为了克服码分多址系统中前向链路功率控制中的延时差错问题，提出了一种新的基于多步预测的前向链路功率控制模型，即考虑到功率控制中控制延时的影响，将信道变化和干扰变化统一为一个时变量，对无线环境变化做出动态的多步相关性预测，移动台根据预测的结果对基站发射功率进行控制．在此基础上,提出了一种利用自适应技术实现多步预测的前向链路功率控制算法,采用这种算法可以动态地跟踪无线环境变化，并且部分地克服了由于信道环境时变造成的功率控制失误问题．通过与传统固定步长算法仿真的对比，证明了上述算法的有效性．

To solve the delay error problem of forward link power control in CDMA (code division multiple access) system, a new multi step forecast model for FPC(forward link power control) is analyzed. The impact of power control delay is considered, and the wireless channel changing and interference changing are uniformed as a new variable to dynamically predict the multi step relevance of the radio environment. The mobile station controls the output power of the forward link based on the prediction. From the model, an adaptive FPC algorithm is developed which tracks the variation of the radio environment changes with self adaptive prediction technique, as a result, it reduces the power control error caused by the time variation of the radio channels. Simulation is performed to demonstrate the above features and to validate the algorithm.