π/4-CQPSK信号的频偏估计算法  

A Carrier Frequency-offset Estimation Algorithm for π/4-CQPSK Signal

作　　者：牛景昌 周德强 NIU Jingchang;ZHOU Deqiang(Equipment Engineering Technology Rresearch Laboratory,Shijiazhuang 050081,China)

机构地区：[1]装备工程技术研究实验室,河北石家庄050081

出　　处：《无线电工程》2020年第5期353-356,共4页Radio Engineering

基　　金：国家科技计划专项经费(2016QY10W1802)。

摘　　要：针对π/4-CQPSK信号频偏估计问题,借鉴基于四次方谱的QPSK信号的频偏估计方法,从理论上分析了π/4-CQPSK信号和QPSK信号四次方谱的不同之处,给出了π/4-CQPSK信号四次方谱中谱线位置与频偏的关系,提出了π/4-CQPSK信号的频偏估计算法,并从理论上给出了算法的使用条件。仿真结果表明,当信噪比大于0 dB时,算法估计的归一化频偏的均方误差小于5×10^-12。To estimate the carrier frequency-offset of π/4-CQPSK,referring to the carrier frequency-offset estimation method of QPSK based on quartic spectrum,the difference between QPSK quartic spectrum and π/4-CQPSK quartic spectrum is analyzed theoretically.The relationship between the position of spectral line in the π/4-CQPSK quartic spectrum and the carrier frequency-offset is shown.A carrier frequency-offset estimation algorithm for π/4-CQPSK is proposed and the situation in which this algorithm is effective is also derived.Simulation results show that the mean square error of the unitary frequency offset of the estimation is below 5×10^-12 when the signal to noise ratio is above 0 dB.

关 键 词：π/4-CQPSK QPSK 频偏估计 四次方谱 

分 类 号：TN911[电子电信—通信与信息系统]