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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 Auxiliary Channel Estimation is the main channel estimation method in OFDM system. The LS method is used to estimate the channel at the pilot point, and the full response of the channel can be obtained by interpolation. In this paper, various interpolation algorithms are introduced in detail, including polynomial interpolation, time-domain interpolation, low-pass interpolation and FFT-based interpolation. And under the influence of different channel factors, various algorithms are compared and analyzed The time domain filtering improves the effect of denoising the channel estimation value further.