多载波DS-CDMA系统中的反向预测功率控制

Reverse-link predictive power control formulticarrier

摘 要:反向闭环功率控制算法在移动台高速运动的衰落信道情况下,功率控制将会带来较大的偏差,这里根据多载波DS CDMA系统反向链路功率控制命令帧的结构,提出了预测功率控制算法.该算法可以对多载波DS CDMA系统中的每个子载波信道的信道条件进行估计,提前预测出每个子载波信道下一个信号接收功率和信号的衰落,并以此为基础形成功率控制命令,对每个子载波信道的衰落进行补偿,从而减小基站接收功率的变化.仿真结果表明,预测算法能够有效改善系统的误码率性能,提高系统容量.

Under the quickly declining channel situation of a fast-moving mobile platform, the backward closed loop algorithm controlled by power can bring relatively great deviation. This study, according to the frame structure of reverse link power control order in multicarrier DS-CDMA, utilized a predictive power control algorithm. The algorithm can be used to estimate the condition in every subcarrier channel and predict the receiving power of the next carrier ahead. The algorithm can also compensate for fading in the subchannel and improve bit error rate performance of the system and the system's capacity.