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为保证OFDM系统的性能不受信道的多径和衰落效应的影响,需要采用信道估计的方法来跟踪信道响应的变化。目前使用比较多的是导频辅助信道估计,首先利用某种估计算法得到导频处信道响应,再通过某种一维或二维的内插算法获得完整的信道响应。研究了各种内插算法,包括常值内插、线性内插、高斯内插、Cubic内插、Sinc内插和变换域内插,并对各算法在不同信道环境下进行了仿真比较。
In order to ensure that the performance of an OFDM system is not affected by the multipath and fading effects of the channel, a channel estimation method is required to track the channel response variation. At present, Pilot Auxiliary Channel Estimation is more commonly used. First, the channel response at the pilot frequency is obtained by using some estimation algorithm, and then the complete channel response is obtained through a one-dimensional or two-dimensional interpolation algorithm. Various interpolation algorithms are studied, including constant value interpolation, linear interpolation, Gaussian interpolation, Cubic interpolation, Sinc interpolation and transform domain interpolation. The algorithms are compared under different channel conditions.