一种WiMAX上行可变步长功率的控制算法

A WiMAX Uplink Power Control Algorithm with Variable Step

功率控制技术是无线通信系统需实现的关键技术,根据IEEE802.16协议要求和WiMAX系统同频干扰特性,WiMAX系统上行链路需要一种合理的功率控制算法.因此,通过改进传统闭环功率控制算法,使得算法中功率控制步长可根据上行链路信道质量而改变,并由此得到一种应用于WiMAX系统上行链路的可变步长功率控制算法.最后通过仿真对比得到算法收敛因子的合理取值,验证了可变步长功率控制算法可有效提高功率控制精度和收敛速度.

The power control technique is critical in wireless communication.According to governing terms in IEEE802.16 protocol and the co-channel interference in WiMAX system,a suitable power control algorithm is required for WiMAX system.Through improving the conventional close-loop power control algorithm,an algorithm with variable step is proposed,whose power control step can vary with the change of uplink channel state.The simulation result derives the suitable convergence factor and verifies the improvement of the proposed algorithm in terms of power control precision and convergence speed.