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一种高效的APSK调制信号载波频偏估计算法
李东波, 欧阳喜
作者单位
李东波 Institute of Information System EngineeringInformation Engineering UniversityZhengzhou Henan 450001China 
欧阳喜 Institute of Information System EngineeringInformation Engineering UniversityZhengzhou Henan 450001China 
摘要:
提出一种有效的幅度相位键控(APSK)调制信号载波频偏估计算法。该算法针对定时同步后的信号数据,根据APSK调制信号星座图数据点幅度半径不同的特点,将星座图上幅度半径最小的数据点保留,其余幅度半径较大的数据点的值均置零。对置零处理后的数据进行4次方谱线提取,从而估计信号的载波频偏。仿真试验表明该算法计算复杂度低, 具有很强的实用性。当数据量为500,信噪比大于15 dB时,频偏估计均方误差低于-80 dB。
关键词:  幅度相位键控  载波频偏估计  星座图  4次方谱
DOI:10.11805/TKYDA201705.0849
分类号:
基金项目:
An efficient algorithm for estimating carrier frequency offset of APSK modulated signal
LI Dongbo, OUYANG Xi
Institute of Information System Engineering,Information Engineering University,Zhengzhou Henan 450001,China
Abstract:
An effective algorithm is presented for estimating carrier frequency offset of Amplitude Phase Shift Keying(APSK) modulated signal. The data of the signal is obtained after the process of timing synchronization. The algorithm is based on the characteristic that the radiuses of the points of the constellation of APSK modulated signal are different. The value of the data is set to zero except the points with the smallest radius. The spectrum line of the quartic spectrum of the zeroing data is extracted to estimate carrier frequency offset. Simulation results show that this algorithm has low complexity and high practicality. The mean square error of the estimation of carrier frequency offset is below -80 dB when the number of symbol is 500 and the signal to noise ratio is above 15 dB.
Key words:  Amplitude Phase Shift Keying  carrier frequency offset estimation  constellation  quartic spectrum

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