摘要
载波频偏估计是数字中继卫星通信系统中的一个关键技术。对非线性变换FFT载波频偏估计算法进行了推导,采用基于周期图峰值位置的三点插值法对FFT算法进行了改进,进一步采用二叉搜索法实现更高精度的载波频偏估计。给出了计算机仿真结果,表明该方案能够有效抑制噪声,在有限的计算量下具有良好的频偏估计性能。
Carrier frequency offset estimation is one of key technologies in digital relay satellite systems. A nonlinear transform FFT algorithm for observing carrier frequency offset is derived. An interpolation algorithm based on the peak and two adjacent points is used to improve the FFT algorithm, A dichotomous search algorithm is then proposed to achieve a more accurate result, Computer simulations have been made and the results show this scheme is effective in prohibiting noise and has good performance with considerable calculation
出处
《现代电子技术》
2007年第21期85-87,共3页
Modern Electronics Technique
关键词
载波频偏估计
FFT插值
二叉搜索
carrier frequency offset estimation
FFT
interpolation
dichotomous search
