基于L型延迟阵列调制宽带转换器的信号载频和二维到达角联合估计  

Joint estimation of carrier frequency and two-dimensional arrival angle based on L-shaped delay array modulation wideband converter

作　　者：姜思仪 付宁 乔立岩 彭喜元 Jiang Si-Yi;Fu Ning;Qiao Li-Yan;Peng Xi-Yuan(School of Electronics and Information Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学电子与信息工程学院,哈尔滨150001

出　　处：《物理学报》2021年第8期186-194,共9页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62071149,61671177)资助的课题。

摘　　要：针对现有的基于欠采样的频率和二维到达角的联合估计存在结构复杂问题,本文提出了一种基于调制宽带转换器技术的L型延迟阵列接收结构.利用延迟通道与未延迟通道采样值之间的相位差可直接估计载频,进而计算二维到达角,无需额外的参数配对操作,避免了配对步骤引入的误差和复杂度的提升.并结合所提L型延迟阵列结构的特点构造相关矩阵和三线性模型,提出了两种参数估计算法,一种基于旋转不变子空间算法,计算量小,适用于需要实时处理的场景;另一种基于正则分解技术,鲁棒性较好,适用于信噪比较低的应用场景.仿真实验表明该方法能较好地从欠奈奎斯特样本中估计目标的载频和二维到达角参数.As the signal spectrum in modern information technology becomes wider and wider,multi-band signals are distributed in a frequency range of tens of GHz.It covers a very wide spectrum but each RF signal has a very narrow band,and the distribution location of the band(or carrier frequency)is completely unknown.For the receiver,the single-band signals transmitted together constitute a multi-band signal.The sampling rate required to jointly estimate the space domain and frequency domain parameters of these signals is getting higher and higher.Modulated wideband converter system is an analog information conversion system for multiband analog signals,which is based on compressed sensing theory and greatly reduces the sampling rate.First,we propose an L-shaped delay array structure based on modulated wideband converter,which can estimate carrier frequency and two-dimensional arrival angles with a small number of samples.Secondly,two parameterestimating algorithms are proposed based on the proposed structure.One is based on the estimating of signal parameter via rotational invariance technique(ESPRIT),which requires a small number of computations and is suitable for real-time processing application scenarios;the other algorithm is based on CANDECOMP/PARAFAC(CP)technique,which has better robustness and is suitable for applications with low signal-to-noise ratio.The samples of the delay channels can be directly used to estimate the carrier frequencies,and then the two-dimensional arrival angles are calculated.No additional pairing issue is required between the parameters.Then we give the time complexity analysis and space complexity analysis of the two methods.It can be found that the computational complexity and space storage occupation of the method based on ESPRIT are lower than those of the CP decomposition method.Then the conditions for unique parameter estimation are given.Finally,simulation experiments show that the proposed methods can estimate the carrier frequencies and twodimensional arrival angles from sub-Nyqui

关 键 词：压缩感知 阵列参数联合估计 二维到达角 阵列式调制宽带转换器 

分 类 号：TN911.7[电子电信—通信与信息系统]