变步长功控算法在TD-HSUPA系统中的运用

An adaptive power control algorithm in TD-HSUPA system

功率控制技术和多用户联合检测技术是在3G移动通信系统中有效克服远近效应和多址干扰,从而提高系统容量的关键技术。针对固定步长功率控制算法对快衰落跟踪效果不是很理想的情况,提出一种适用于时分高速上行分组接入(time division-high speed uplink packet access,TD-HSUPA)系统的不对称自适应变步长功率控制算法。此算法考虑了TD-HSUPA系统中的时延和非连续传输模式,根据前3次发射功率控制(transmit power control,TPC)命令来决定下一次功率控制的步长,并将多用户联合检测技术引入到功率控制中,通过TD-HSUPA物理层仿真平台进行仿真,证明了基于迫零线性块均衡器(zero-forcing block linear equalizer,ZF-BLE)的联合功率控制算法较固定步长功率控制算法,在降低误比特率(bit error ratio,BER)和信干比(signal-to-interference ratio,SIR)收敛性方面有较大提高。

Power control technology and muhi-user joint detection technology are the key techniques in order to improve capacity in the 3rd generation mobile conununication systems which can get rid of near-far effect and muhi-aecess interference. This paper proposes a novel asymmetric adaptive variable step power control algorithm in TD-HSUPA system to compensate the fixed step power control algorithm, bec, ause fixed step power control algorithm can＇t keep up with the fast fading signaling ideally. This algorithm takes into account delay performance and non-continuous transmission mode in TD-HSUPA system, and the next power eontrol step is decided by the first three TPC commands. At the same time, the multi-user joint detection algorithm is introduced into the power control technology. By the simulation in the physical layer simulation platform of TD-HSUPA system, joint power control algorithm based on ZF-BLE is more effective on decreasing BER and the convergence of SIR than fixed step power control algorithm.