基于DCT的OFDM信道估计  

DCT-based Channel Estimation for OFDM Systems

作　　者：李晓晗[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2008年第4期31-33,共3页Radio Engineering

摘　　要：在宽带移动环境下,由于多普勒频移以及多径的影响,信道是时变的。为了消除信道对传输信号的影响,需要对信道进行估计。给出了2种基于离散余弦变换(DCT)的信道估计方法,可以很好的降低频谱泄露造成的混叠失真,适用于非整数倍的抽样信道。其中一种性能较好,另一种实现更加方便。仿真结果表明,这两种算法的性能均优于基于DFT的信道估计算法。Under wideband mobile condition, the channel is time-varying by the effect of Doppler and mutipath. It is necessary to estimate the channel information for eliminating the effect of the channel to the transmitted signals. Two channel estimation methods based on DCT are proposed for OFDM systems. They can mitigate the abasing error caused by spectral leakage well and are applicable for non integer sampled channel. One of the method has a better performance,while the other has the advantage of easy realization The simulation results show that the performance of both the two algorithms are better than that of algorithms based on DFT.

关 键 词：正交频分复用 信道估计 离散余弦变换 

分 类 号：TN914[电子电信—通信与信息系统]