张鹏,,
巴斌
信息工程大学信息系统工程学院 ??郑州 ??450001
基金项目:国家自然科学基金(61401513)
详细信息
作者简介:崔维嘉：男，1976年生，博士，副教授，研究方向为移动通信、信号处理等
张鹏：男，1993年生，硕士生，研究方向为通信信号处理、稀疏重构等
巴斌：男，1987年生，博士，讲师，研究方向为阵列信号处理、参数估计等
通讯作者:张鹏 ieu_zp@outlook.com
中图分类号:TN911.7计量
文章访问数:2000
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被引次数:0
出版历程
收稿日期:2018-05-14
修回日期:2018-10-24
网络出版日期:2018-11-14
刊出日期:2019-03-01
Time of Arrival Estimation Based on Sparse Reconstruction Loop Matching Pursuit Algorithm
Weijia CUI,Peng ZHANG,,
Bin BA
Institute of Information System Engineering, The Information Engineering University, Zhengzhou 450001, China
Funds:The National Natural Science Foundation of China (61401513)
摘要
摘要:在单样本(SMV)、低信噪比条件下，稀疏重构方法可提升时延估计精度，但现有的重构算法在支撑集元素的选择中存在错选和漏选的情况，从而导致估计精度受限。针对上述问题，该文提出一种基于循环匹配追踪(LMP)的稀疏重构时延估计算法。该方法引入了“循环删除，匹配添加”的思想，有效提升了直达径的估计精度。算法首先建立信道冲激响应稀疏表示模型；然后在获得初始支撑集的前提下，先循环删除支撑集内的元素，再从支撑集补集中依据与当前残差内积值最大来匹配添加新元素，直至残差内积基本不变；最后利用时延值与稀疏支撑集的关系得到了时延的估计值。仿真结果表明，所提算法相比于传统稀疏重构时延估计算法具有更高的估计精度。同时基于USRP平台，利用实际信号对所提算法进行了有效性验证。
关键词:时延估计/
稀疏重构/
循环匹配追踪/
支撑集/
USRP平台
Abstract:Under Single Measurement Vector (SMV) and low Signal-to-Noise Ratio (SNR) conditions, the sparse reconstruction method can improve the estimation accuracy of Time Of Arrival (TOA). However, the existing reconstruction algorithms have some mistakes and missing in the selection of sparse support set elements, which leads to limited estimation accuracy. In order to solve this problem, this paper proposes an algorithm based on sparse reconstruction Loop Matching Pursuit (LMP), which improves the estimation accuracy of the direct path. The algorithm first establishes a sparse representation model of channel impulse response. Then, under the premise of having obtained initial support set, the elements in the support set are removed cyclically. In addition, according to the maximum value of the current residual within the product, the remaining elements are used to match and add the new elements until the residual product is the same. Finally, the estimate of the TOA is obtained using the relationship between the time delay value and the sparse support set. The simulation results show that the proposed algorithm has higher estimation accuracy than the traditional sparse reconstruction time delay estimation algorithm. At the same time, based on the USRP platform, the effectiveness of the proposed algorithm is verified by the actual signal.
Key words:Time Of Arrival (TOA)/
Sparse reconstruction/
Loop Matching Pursuit (LMP)/
Support set/
USRP platform
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