摘要: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、Sine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.%The channel estimation technique for the OFDM systems based on the pilot arrangement is investigated.The interpolation algorithm which always follows the channel estimation of the pilot sub-carriers is focused. The estimation of the pilot sub-carriers is based on the LS and MMSE and the channel interpolation is done with the nearest interpolation, linear interpolation, Gaussian interpolation, cubic interpolation, sine interpolation and the transform-domain interpolation. All the schemes are compared with both theoretical analysis and computer simulations.