OFDM系统中两种变换域信道估计模型及其应用环境  

Two Transform Domain Estimation Methods for OFDM System and Their Application Environment

作　　者：侯春萍[1] 宋胜辉[1] 贾蕾[1] 曹达仲[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2004年第2期105-110,共6页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(60172068).

摘　　要：移动通信用户的急剧增加需要开发以较低发送功率提供高传输率的移动通信系统.该文介绍了正交频分多路复用(OFDM)系统中两种采用辅助导频信号的信道估计模型,两种模型分别采用了时域 频域以及频域 变换域的变换方法;分析了在相同信道冲激响应条件下两种估计模型的性能,并讨论了两种方法的优缺点和适用环境.时域 频域模型被应用于自适应OFDM系统中的辅助导频信道和比特分配算法.通过与理想自适应系统相比较,研究了信道估计的误差对于系统性能的影响.Two pilots-aided channel estimation methods, which use time-frequency and frequency-transform domains, were presented. Their performances were contrasted by using them in the same channel conditions, and their favorite application environments were analyzed. The time-frequency method was used in adaptive orthogonal frequency division multiplex (OFDM) system in assistance of the channel and bit allocation. A study of the effect of estimation error on system performance was also performed on the basis of comparison.

关 键 词：OFDM系统 变换域信道估计模型 正交频分多路复用 信道分配 比特分配 

分 类 号：TN911.23[电子电信—通信与信息系统]