CDMA系统中一种基于代价函数的联合功率控制算法

A Joint Power Control Algorithm based on Cost Function in CDMA System

功率控制技术是CDMA系统中克服远-近效应、降低多址干扰、增大系统容量的一项关键技术。首先比较了传统功率控制和联合功率控制算法,然后提出了一种基于联合系数的功率控制算法,该算法结合了功率控制技术和MM SE多用户检测技术。仿真结果表明,采用提出的功率控制算法,在系统内发射总功率一定的条件下,可以使各用户获得更高的信干比服务质量,系统容量也具有进一步提高的潜力。

In CDMA systems, power control is a key technology that cope with near-far effect, reduce multiple access interfererence and increase capacity of communication. In this paper, at first, traditional power control and joint power control algorithm are compareded,then a power control algorithm based on coefficiency is introduced,of which combined power control and MMSE multiuser detection. Tests show that on condition that the total transmitted power in the CDMA system is given,user can obtain a high SIR and the capacity of the system can be also improved with the proposed algorithm.