正交复用二进制偏移载波信号的多参数估计  

Parameters Estimation of Quadrature Multiplexing Binary Offset Carrier Signal

作　　者：吴超 张天骐[1] 熊天 闻斌 WU Chao;ZHANG Tianqi;XIONG Tian;WEN Bin(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《北京邮电大学学报》2023年第1期84-89,共6页Journal of Beijing University of Posts and Telecommunications

基　　金：重庆市自然科学基金项目(cstc2021jcyj-msxmX0836)。

摘　　要：在低信噪比环境下,针对正交复用二进制偏移载波(QMBOC)信号的多参数盲估计问题,提出了基于频域累加平均的循环谱估计算法。首先,根据信号模型求得QMBOC信号循环自相关函数,该循环自相关函数等效为2个子信号循环自相关函数的和;然后,利用傅里叶变换分别求取循环谱,对循环谱进行频域累加平均;最后,根据QMBOC信号循环频率截面的特征进行谱峰值搜索,实现对伪码速率、副载波速率和载波频率的盲估计。实验结果表明,所提算法可以实现在-9.5 dB下对QMBOC信号的有效多参数估计。In the low signal-to-noise ratio environment,the problem of multi-parameter blind estimation for quadrature multiplexed binary offset carrier(QMBOC)signals is existed.To solve this problem,a cyclic spectral estimation algorithm is proposed based on frequency domain cumulative averaging.First,the cyclic autocorrelation function of QMBOC signal is obtained from the signal model.The cyclic autocorrelation function is equivalent to the sum of the cyclic autocorrelation function of two subsignals.Then the cyclic autocorrelation function is used to derive the cyclic spectrum by Fourier transform,and the cyclic spectrum is averaged by frequency domain accumulation.Finally,the spectral peak is searched to realize the blind estimation of pseudo-code rate,subcarrier rate and carrier frequency according to the spectral line characteristics of the cyclic frequency section of QMBOC signal.The experimental results show that the proposed algorithm can effectively estimate multiple parameters of QMBOC signal at-9.5 dB.

关 键 词：正交复用二进制偏移载波 循环谱 多参数估计 

分 类 号：TN911.7[电子电信—通信与信息系统]