OFDM系统中一种低复杂度的信道估计算法  

Low-Complexity Channel Estimation Method for OFDM Systems

作　　者：胡蝶[1] 周小林[1] 

机构地区：[1]复旦大学通信科学与工程系,上海200433

出　　处：《数据采集与处理》2010年第6期677-682,共6页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金(60902007;60802011)资助项目;高等学校博士学科点专项科研基金(200802461141)资助项目;上海市教育委员会和上海市教育发展基金会"晨光计划"(09CG01)资助项目;国家科技重大专项(2009ZX03002-003)资助项目

摘　　要：提出一种适用于正交频分复用(Orthogonal frequency division multiplexing,OFDM)系统的低复杂度信道时域响应估计算法。在发送端,算法基于最小均方误差(Mean-square error,MSE)准则以及给定的导频分布对导频功率及相位进行设计;在接收端,算法直接对接收到的导频符号进行求和,通过对求和结果进行简单加权后得到信道时域响应的估计。由于该算法在估计信道时只需进行很少量的复数乘法运算,因此接收端的计算复杂度非常低。理论分析与仿真结果表明,当信道时不变或慢时变时,该算法具有较小的估计均方误差。A low-complexity channel estimation method for orthogonal frequency division multiplexing（OFDM） systems is proposed.At the receiver,the power and phases of the pilots are designed based on the minimum mean-square error（MSE） criteria and the given pilot placement.At the receiver,the estimation of the channel impulse response is obtained by directly adding the received pilots and then multiplying the sum by a weighted factor.Since only a small number of complex multiplications are needed in the estimation,the computational complexity at the receiver is very low.Theoretical analysis and simulation results show that,when the channel is time-invariant or slowly time-varying,the method has a relatively small estimation MSE.

关 键 词：正交频分复用 信道估计 导频设计 

分 类 号：TN911.23[电子电信—通信与信息系统]