An improved hybrid Time of Arrival (ToA)/ Angle of Arrival (AoA) location algorithm by adopting Gauss-Newton iterative algorithm is proposed. It is with the advantage of fast convergence and combining with the grid-se...An improved hybrid Time of Arrival (ToA)/ Angle of Arrival (AoA) location algorithm by adopting Gauss-Newton iterative algorithm is proposed. It is with the advantage of fast convergence and combining with the grid-search-based method to optimize the initial object coordinates of the iteration, meanwhile, under the condition of small measurement errors caused by noises of ToA and AoA, the algorithm performance can be improved effectively. In the Non-Line-of-Sight (NLoS) environments of the Wireless Sensor Network (WSN), simulation results show that improved accuracy is gained with moderate flexibility and fast steady convergence compared with the existing algorithms.展开更多
波达方向(direction of arrival,DOA)估计是阵列信号处理中的一个关键领域,而波达角(angle of arrival,AOA)则是其核心参数。将AOA估计作为主要研究目标,提高其在任意结构阵列中的准确性。通过分析现有文献中关于任意结构阵列的系统模型...波达方向(direction of arrival,DOA)估计是阵列信号处理中的一个关键领域,而波达角(angle of arrival,AOA)则是其核心参数。将AOA估计作为主要研究目标,提高其在任意结构阵列中的准确性。通过分析现有文献中关于任意结构阵列的系统模型,基于E-子空间理论,结合最大似然原理与Lloyd-like迭代算法,提出了一种新的子空间逼近迭代算法。此外,为了降低计算复杂度,结合MUSIC算法,提出了基于MUSIC峰值范围的迭代改进算法。最后,通过仿真验证了以上方法在毫米波信道估计中的有效性,相较于传统的MUSIC算法性能显著提升。展开更多
针对无线传感器网络中的联合接收信号强度(received signal strength,RSS)和到达角度(angle of arrival,AOA)定位问题,提出一种全新的凸组合定位方法。该方法使用某些特定点(称为虚拟点)的凸组合来估计目标点的位置。提出了基于二次约...针对无线传感器网络中的联合接收信号强度(received signal strength,RSS)和到达角度(angle of arrival,AOA)定位问题,提出一种全新的凸组合定位方法。该方法使用某些特定点(称为虚拟点)的凸组合来估计目标点的位置。提出了基于二次约束二次规划(quadratically constrained quadratic programming,QCQP)和半正定规划(semidefinite programming,SDP)两种虚拟点构造方法。在此基础上,将目标定位的极大似然(maximum likelihood,ML)估计问题进行凸化,得到组合系数,进一步得到目标定位结果。数值实验表明,所提出的凸组合方法比文献中的几种定位方法具有更高的精度,特别是相对于线性最小二乘(linear least squares,LLS)方法,精度最高提升约40%。此外,其定位结果可以作为ML估计方法的初始化,进一步提升定位性能。展开更多
基金supported by National Natural Science Foundation of China under Grant No.61172073State Key Laboratory of Networking and Switching Technology (Beijing Universityof Posts and Telecommunications) under Grant No.SKLNST-2009-1-09+1 种基金Open Research Fund of National Mobile Communications Research Laboratory, Southeast University, P. R.ChinaChina Fundamental Research Funds for the Central Universities:Beijing Jiaotong University
文摘An improved hybrid Time of Arrival (ToA)/ Angle of Arrival (AoA) location algorithm by adopting Gauss-Newton iterative algorithm is proposed. It is with the advantage of fast convergence and combining with the grid-search-based method to optimize the initial object coordinates of the iteration, meanwhile, under the condition of small measurement errors caused by noises of ToA and AoA, the algorithm performance can be improved effectively. In the Non-Line-of-Sight (NLoS) environments of the Wireless Sensor Network (WSN), simulation results show that improved accuracy is gained with moderate flexibility and fast steady convergence compared with the existing algorithms.
文摘波达方向(direction of arrival,DOA)估计是阵列信号处理中的一个关键领域,而波达角(angle of arrival,AOA)则是其核心参数。将AOA估计作为主要研究目标,提高其在任意结构阵列中的准确性。通过分析现有文献中关于任意结构阵列的系统模型,基于E-子空间理论,结合最大似然原理与Lloyd-like迭代算法,提出了一种新的子空间逼近迭代算法。此外,为了降低计算复杂度,结合MUSIC算法,提出了基于MUSIC峰值范围的迭代改进算法。最后,通过仿真验证了以上方法在毫米波信道估计中的有效性,相较于传统的MUSIC算法性能显著提升。
文摘针对无线传感器网络中的联合接收信号强度(received signal strength,RSS)和到达角度(angle of arrival,AOA)定位问题,提出一种全新的凸组合定位方法。该方法使用某些特定点(称为虚拟点)的凸组合来估计目标点的位置。提出了基于二次约束二次规划(quadratically constrained quadratic programming,QCQP)和半正定规划(semidefinite programming,SDP)两种虚拟点构造方法。在此基础上,将目标定位的极大似然(maximum likelihood,ML)估计问题进行凸化,得到组合系数,进一步得到目标定位结果。数值实验表明,所提出的凸组合方法比文献中的几种定位方法具有更高的精度,特别是相对于线性最小二乘(linear least squares,LLS)方法,精度最高提升约40%。此外,其定位结果可以作为ML估计方法的初始化,进一步提升定位性能。
