无线定位中基于旋转不变 PM的时延估计

李海文; 陈松; 张龙; 郑娜娥

doi:doi:10.11805/tkyda201903.0418

太赫兹科学与电子信息学报, 2019, 17 (3): 418, 网络出版: 2019-07-25

无线定位中基于旋转不变 PM的时延估计

Time delay estimation based on rotation-invariance PM in wireless positioning

论文大纲

李海文 ^*陈松张龙郑娜娥

作者单位

战略支援部队信息工程大学数据与目标工程学院，河南郑州 450001

正交频分复用旋转不变传播算子时延估计 Orthogonal Frequency Division Multiplexing Estimating Signal Parameter via Rotational Invaria Propagator Method time delay estimation

摘要

定位参数的快速估计是无线定位系统的关键环节。针对超分辨时延估计算法计算复杂度较高这一问题，提出一种基于旋转不变传播算子 (PM)的时延估计算法。该算法首先对正交频分复用(OFDM)频域接收信号进行建模，然后计算协方差矩阵，再根据子载波流行矩阵的范德蒙矩阵属性，采用旋转不变 PM算法实现时延参数的闭式解，从而既无须特征值分解又避免了伪谱峰搜索，计算速度快。理论分析和仿真结果表明，该算法在计算量大幅度下降的同时，参数估计性能接近于基于旋转不变技术 (ESPRIT)估计信号参数算法，具有一定的可行性和有效性。

Abstract

Fast estimation of location parameters is the key for the wireless positioning system, but super-resolution time delay estimation algorithms commonly have high computational complexity. Aiming at solving this problem, a time delay estimation based on rotation-invariance Propagator Method(PM) is proposed in Orthogonal Frequency Division Multiplexing(OFDM) system. Firstly, the received signal in OFDM frequency domain is modeled, and then the covariance matrix is calculated. Finally, according to the Vandermonde matrix attribute of subcarriers steering matrix, the closed-form solution of time delay parameter is accomplished by rotation-invariance PM algorithm, which not only does not need eigenvalue decomposition but also avoids the pseudo spectral peak search, and the calculation speed is fast. Theoretical analysis and simulation results show that the performance of the proposed algorithm is close to that of the Estimating Signal Parameter via Rotational Invariance Techniques(ESPRIT) algorithm with a significant cut in the computational complexity, and the algorithm has good feasibility and effectiveness.

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李海文, 陈松, 张龙, 郑娜娥. 无线定位中基于旋转不变 PM的时延估计[J]. 太赫兹科学与电子信息学报, 2019, 17(3): 418. LI Haiwen, CHEN Song, ZHANG Long, ZHENG Na’e. Time delay estimation based on rotation-invariance PM in wireless positioning[J]. Journal of terahertz science and electronic information technology, 2019, 17(3): 418.

无线定位中基于旋转不变 PM的时延估计

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