基于插值和周期图法的高动态信号载波频偏粗估计  

Coarse carrier offset estimation of high dynamical signal based on interpolation and periodogram algorithm

作　　者：魏苗苗 刘洲峰[1] 李春雷[1] 孙俊[1,2] Wei Miaomiao;Liu Zhoufeng;Li Chunlei;Sun Jun(School of Electronics&Information,Zhongyuan University of Technology,Zhengzhou 450007,China;School of Information Enginee-ring,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]中原工学院电子信息学院,郑州450007 [2]郑州大学信息工程学院,郑州450001

出　　处：《计算机应用研究》2022年第2期548-551,556,共5页Application Research of Computers

摘　　要：针对卫星通信系统中接收信号载波动态范围大、信噪比低造成的信号载波同步困难的问题进行了研究。基于联合插值和频域移位平均周期图法的载波频偏估计算法,通过对半符号周期频域移位平均周期图法中各并行支路输出的功率谱峰值波形进行双谱线插值,以进一步降低载波频偏变化率估计误差,进而改善原算法捕获概率。仿真结果显示,当比特信噪比为2.5 dB时,相比于半符号周期频域移位平均周期图法,该算法只增加了一次插值计算就可以实现将载波频偏变化率估计误差降低27%。在同等估计精度和参数设置下,相比于半符号周期频域移位平均周期图法和带补零频域移位评价周期图法,基于联合插值和周期图法的载波频偏粗估计算法可达到更高的捕获概率。In satellite communication systems,the received signal usually has the characteristics of high dynamic range and low signal-to-noise ratio(SNR),which leads to difficulty of carrier synchronization.The carrier estimation algorithm based on interpolation and frequency domain shifted average periodogram method could reduce the estimation error of frequency offset derivative,and increase the acquisition probability by bispectrum interpolation on the peak waveform of power spectrum output by parallel branches in the semi-symbol frequency domain shifted average periodogram method.The simulation results show that when bit SNR is 2.5 dB,compared with the semi-symbol frequency domain shifted average periodogram method,the estimation error of the frequency offset derivative can be reduced by 27%with only one interpolation calculation added.With the same accuracy requirement and parameter setting,compared with semi-symbol frequency domain shifted average periodogram method and zero-padding frequency domain shifted average periodogram method,the proposed algorithm reaches a higher probability of acquisition.

关 键 词：频偏估计 载波同步 频域移位 插值估计 高动态 

分 类 号：TN927.23[电子电信—通信与信息系统]