快衰落信道下OFDM系统的信道估计简化算法  

A simplified channel estimation method for OFDM system with fast fading channels

作　　者：焦淑蓉[1] 罗汉文[1] 杨峰[1] 

机构地区：[1]上海交通大学无线通信研究所,上海200030

出　　处：《信息技术》2005年第12期7-9,111,共4页Information Technology

基　　金：国家自然科学基金重点项目(60332030);国家高技术研究发展计划(863计划);重大专项项目(2003AA123310)

摘　　要：在快衰落时变信道中,正交频分复用(OFDM:Orthogonal Frequency Division Multiplexing)系统子载波间的正交性会遭到破坏,由此引起的载波间干扰(ICI:Inter-Carrier Interference)会对系统性能带来很大的影响。本文提出了一种利用时域线性模型的信道估计算法,利用随时间线性变化的模型描述信道。仿真结果表明,本算法能够有效地消除载波间干扰,降低系统的BER。与类似算法相比,当系统的BER性能相同时,算法复杂度大大的降低。A loss of subchannel orthogonality due to time- variant muhipath channels in Orthogonal Frequency Division Multiplexing （OFDM） systems leads to intercarrier interference （ICI） which increases the error of system. In this paper, a simplified channel estimation method using time - domain linear model is proposed, assuming that the channel impulse response varies in a linear fashion during an OFDM symbol time - duration. The simulation result shows that this method can reduce ICI effectively and maintain the performance of the system while reducing the complexity effectively.

关 键 词：OFDM 载波间干扰 线性内插 

分 类 号：TN973.3[电子电信—信号与信息处理]