OFDM系统信道估计技术研究

Research on Channel Estimation of OFDM

论文介绍了信道的估计算法和插值算法,对FFT插值算法进行了优化,通过加窗处理解决了FFT算法中频谱能量泄露的问题。针对变换域滤波算法中导频信息不能集中在低频区域的问题,提出了内插和变换域滤波结合的算法,使导频信息变化平缓,更好的集中在了低频区,通过仿真分析表明,信道的估计性能得到提高,运算量增加不大。

The paper introduces the channel estimation algorithm,based on pilot estimation algorithm were studied,and dis-cuss the pilot insertion and selection,channel estimation algorithm and the interpolation algorithm. The FFT interpolation algorithmhas been optimized through the window approach to solving the problem of leakage of spectral energy in the FFT algorithm. Pilot in-formation can not be concentrated in the low frequency region for the transform domain filtering algorithm,interpolation and combi-nation of transform domain filtering algorithm is given. The pilot information changes smoothly and can be concentrated in the lowfrequency region. The results show that the algorithm could improve channel estimation performance with small additional computing.