多载波系统的功率控制方法  

A Power Correction Method Based on EESM in Multi-Carrier System

作　　者：王军虎[1] 王永生[1] 姜静[1] 郭晓静[2] 

机构地区：[1]西北工业大学电子信息学院,陕西西安710072 [2]航天动力技术研究院47所,陕西西安710025

出　　处：《计算机仿真》2009年第5期341-344,352,共5页Computer Simulation

基　　金：十一.五预研项目(513250404);航天科技创新基金资助项目(N7CH0001)

摘　　要：功率控制是无线通信系统的关键技术之一,为了克服多载波通信系统中功率调整量的振荡起伏,以及频繁功率校正带来的信令开销增大的问题,提出了基于指数有效信干噪比映射的功率校正算法和步骤。方法较传统的功率控制在功率控制效率上有更优的性能。采用基于指数有效信干噪比映射的功率校正算法,将多个子载波测量得到的信干噪比映射为AWGN信道下的一个有效值,与对应的目标参考功率值比较,从而确定功率校正值,通过信令反馈给移动终端。仿真实验结果表明,基于指数有效信干噪比映射的功率校正算法与传统算法相比,能够较短的时间内把功率校正到参考目标值,并减少了信干燥比的振荡起伏,提高了功率控制的效率,从而增强了系统性能。Power control is one of the key techniques in wireless telecommunication system. In order to overcome the fluctuation of the power correction and reduce the overhead caused by frequent correction messages, a power correction method based on EESM （Exponent Effective SINR Mapping） is proposed for multi - cartier telecommunication system, and its procedures are explained. The proposed method outperforms the traditional power correction in accuracy and efficiency. By mapping the multiple SINRs of multi - carrier signal into an effective SINR in AWGN. it determines the correction amount of power level through comparing it to the reference target SINR. The correction value is fedback to the motile terminals through messages. The simulation proved that the power correction method based on EESM can adjust the transmission power to an ideal value in a shorter time, and reduce the overall correction times, and mitigate the fluctuation of power level, thus improving the efficiency of power control and performance of the system.

关 键 词：多载波系统 正交频分复用 有效信干噪比 指数有效信噪比映射 功率控制 

分 类 号：TN911.7[电子电信—通信与信息系统]