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基于谱相关的CBOC信号参数盲估计
刘董华,张天骐,梁先明,袁帅
0
(重庆邮电大学 信号与信息处理重庆市重点实验室,重庆400065;中国西南电子技术研究所,成都610036)
摘要:
针对低信噪比下组合二进制偏移载波(CBOC)调制信号的参数盲估计问题,提出了利用谱相关对CBOC信号进行参数估计方法。首先给出了CBOC信号模型,然后根据CBOC信号的数据通道和导频通道之间有良好的正交性特点,详细推导出其谱相关函数可以化简为两个BOC信号谱相关函数的叠加,最后根据CBOC信号循环频率截面的特点进行峰值检索后,实现对伪码速率、载频速率和副载波速率的盲估计。推导结果和计算机仿真分析表明,该方法可以实现在低信噪比下对伪码速率、载频速率和副载波速率的有效估计。
关键词:  组合二进制偏移载波(CBOC)  谱相关函数  循环频率截面  参数估计
DOI:
基金项目:国家自然科学基金资助项目(61671095,61371164,61702065,61701067,61771085);信号与信息处理重庆市重点实验室建设项目(CSTC2009CA2003);重庆市研究生科研创新项目(CYS17219);重庆市教育委员会科研项目(KJ1600427,KJ1600429)
Blind parameter estimation of CBOC signals based on spectral correlation
LIU Donghua,ZHANG Tianqi,LIANG Xianming,YUAN Shuai
(Chongqing Key Laboratory of Signal and Information Processing,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Southwest China Institute of Electronic Technology,Chengdu 610036,China)
Abstract:
For the blind parameter estimation of combined binary offset carrier(CBOC) modulated signals under low signal-to-noise ratio(SNR),a method based on spectral correlation is proposed to estimate CBOC signal parameters.Firstly,the CBOC signal model is given.Secondly,based on the good orthogonality characteristic between the data channel and the pilot channel of the CBOC signal,it is deduced that the spectral correlation function can be simplified as the superposition of the spectral correlation functions of two BOC signals.Finally,the pseudo code rate,carrier frequency rate and subcarrier rate can be blindly estimated according to the characteristics of the CBOC signal cyclic frequency section.The derivation results and computer simulation analysis show that the proposed method can estimate the pseudo code rate,carrier frequency rate and subcarrier rate effectively in low SNR.
Key words:  composite binary offset carrier(CBOC)  spectral correlation function  cyclic frequency section  parameter estimation
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