小波变换在OFDM系统频偏估计中的应用

Frequency Offset Estimation in the OFDM System Using Wavelets Transform

提出了一种基于小波变换的正交频分复用(OFDM)系统频偏估计的新方法,这种方法与其他频偏估计方法的不同在于,它不需要知道不稳定信号的平均接收功率,也不需要变化的时间观察窗,仿真显示,它可以跟踪频偏的变化,具有自适应特性,估计方法简单易行,且精度较高.

A suggestion, based on wavelet transform, was proposed to estimate the frequency offset in the orthogonal frequency division multiplexing (OFDM) system. Compared with the existed methods, the new method of frequency offset estimation does not have to know the received averaging power of unsteady signals and to open the windows for varied time observation. Also, the new form of wavelet transform is adaptive and is able to track the swing of frequency offset. The simulation shows that it has higher precision. With the help of it, the estimation for frequency offset in the OFDM system could be done very well.