基于DCT的OFDM信道估计算法研究

OFDM Channel Estimation Algorithms Based on DCT

信道估计技术是OFDM技术的关键技术之一。文章首先简要介绍了信道估计的基本算法,重点研究了离散余弦变换(DCT)理论,在此基础上设计了一种的新的插值方法,并将其运用到信道估计算法中。该算法实现简单,不仅能降低干扰误差,而且能减少基于离散傅里叶变换(DFT)的信道估计算法在多径衰落信道中的高频失真,估计效果也优于基于DFT的算法。文章最后对两种算法做了仿真,给出了均方误差和误码率的比较曲线图,得出了较理想的结论。

Channel estimation technology is one of the key technologies of the OFDM technology.In this paper,the basic algorithm of channel estimation is briefly introduced.Then it emphatically studies the discrete cosine transform（DCT） theory,designs a new interpolator based on DCT for channel estimation.This method has the advantage of easy implementation,and can mitigate the aliasing error and high-frequency distortion of discrete Fourier transform（DFT） –based channel estimator used in multipath fading channels,and the performance of the proposed estimator outperforms the DFT-based estimator.Finally,the mean square error and symbol error rate curves are given and compared,and the conclusion is satisfactory.