摘要
导频辅助信道估计法是OFDM系统中的主要信道估计方法,使用LS方法估计导频点处的信道,使用插值法可以获得信道的全响应。文章详细地介绍了各种插值算法,包括多项式插值算法、时域插值算法、低通插值算法和基于FFT的插值算法,并在不同信道因素影响下,对各种算法进行了对比分析,然后进行了时域滤波改进,达到了对信道估计值进一步去噪的效果。
Pilot symbol aided channel estimation is the main channel estimation method in OFDM system. The pilot symbol estimation is based on LS method and the whole channel response can be got by interpolation. In this paper, the interpolation algorithms, such as polynomial interpolation, time domain interpolation, low pass filter interpolation and FFT based interpolation are introduced in detail, and they are analyzed and compared in different channel factors. Then the improvement of time domain filtering is made at the end and much more noise of channel estimation values are eliminated.
出处
《电力系统通信》
2005年第9期10-13,共4页
Telecommunications for Electric Power System
