OFDM系统中一种改进的线性内插方法

In the OFDM system, the channel estimation is so significant that it affects the reliability of coherent detection at the receiver side. Interpolation is an important step for pilot aided channel estimation. In this paper, an improved linear interpolation method combined with exponential smoothing in time series analysis is proposed. A study of exponential smoothing has helped to get a view of theoretical principles of how exponential smoothing suppresses the noise. Under the assumption of slow fading wireless channel, the proposed method is compared with linear interpolation by simulation. The result of simulation indicates that the proposed method is superior to linear interpolation.