OFDM中基于导频的加窗FFT信道估计

Channel Estimation for Pilot-based Windowed FFT in OFDM System

正交频分复用(OFDM)是一种正交的多载波复用技术,分析了OFDM系统中基于导频的信道估计模型;基于导频的信道估计需要进行插值,为了降低插值算法的复杂度,研究了基于导频的FFT信道估计算法。由于直接FFT信道估计算法存在能量频谱泄露问题,提出了基于汉明窗函数的优化型加窗FFT信道估计的算法。实验仿真表明:在多径衰落信道下,该算法能够有效地提高OFDM系统的信道估计性能。

Orthogonal Frequency Division Multiplexing（OFDM） is multiplexing technology of orthogonal multi-carrier,and the channel estimation model based on pilot in OFDM system is analyzed;For the channel estimation based on pilot demands interpolation,and in order to reduce the complexity of interpolation algorithm,the FFT channel estimation algorithm based on pilot is studied.For the existence of energy spectrum leakage problems,in FFT channel estimation algorithm,the optimized FFT channel estimation algorithm based on the Hamming windowed function is proposed.The simulation results show that,in the multi-path fading channel,the proposed algorithm could effectively improve the channel estimation performance of OFDM system.