TD-SCDMA系统中低代价信道估计方法的改进  

Improvement of the low-cost channel estimation method used in TD-SCDMA system

作　　者：康绍莉[1] 裘正定[1] 李世鹤 

机构地区：[1]北方交通大学信息科学研究所,北京100044 [2]大唐电信集团TDD开发部,北京100083

出　　处：《通信学报》2002年第10期108-113,共6页Journal on Communications

基　　金：国家自然科学基金资助项目(69971002);大唐电信基金资助项目

摘　　要：TD-SCDMA系统中运用的B.Steiner估计器是一种低代价的信道估计器,其估计精度受信道中加性噪声的影响,导致估计值与真实值相比误差较大,影响系统性能。本文提出一种门限处理方法,对Steiner估计器得到的信道响应进行改进,削弱噪声影响。模拟实验表明,改进的信道响应更接近真实值,能提高系统性能。并且,这种后处理方法简单、易于实现,很小或几乎不增加系统的运算量。B.Steiner estimator used in the time-division synchronous code-division multiple access (TD-SCDMA) system is a low cost estimator. The precision of the estimated channel impulse responses (CIRs) is affected by noises in the channel, which result in big errors compared to real CIRs. In this paper we proposed a gate method which processes the output of the Steiner estimator and thus decreases noises. Simulation results show that the improved CIRs are closer to the ideal ones and also they can improve the system performance. In addition, this gate method is very simple and can be easily realized without or nearly not adding the computation of the system.

关 键 词：TD-SCDMA系统 低代价信道估计方法 时分同步码分多址 B.Steiner估计器 门限处理 移动通信 

分 类 号：TN929.533[电子电信—通信与信息系统]