低信噪比下基于L型阵列的信源个数和DoA估计  

Source number and DoA estimation for l-shape array under low SNR region

作　　者：李小兵[1] 刘雪峰[2] 杨洋[2] 景小荣[2] 

机构地区：[1]中兴通讯股份有限公司,深圳518057 [2]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《数字通信》2014年第3期28-33,共6页Digital Communications and Networks

基　　金：国家科技重大专项(2014ZX03001004-003)

摘　　要：低信噪比(signal-to-noise ratio,SNR)或小接收快拍数条件下,经典波达方向(direction of arrival,DoA)估计算法存在估计误差较大的缺点。针对该问题,充分利用L型阵列接收数据的自、互相关信息,给出一种适用于低SNR和小接收快拍数据环境的信源个数及DoA估计算法。该算法首先利用接收数据互协方差矩阵所得自相关矩阵的特征值,给出了一种信源个数估计方法;进而提出了一种新的二维DoA估计方法。计算机仿真验证了该算法在低SNR及小接收快拍数情况下的有效性。Under low SNR region or with the small number of the snapshots, the classic DoA algorithms have the drawback of larger estimation error. To resolve the problem, by fully taking advantage of the autocorrelation and cross-correlation in- formation of the received dates of L-shape sensor arrays, the paper presents an algorithm of source number and DoA estima- tion suitable for low SNR region and small number of the snapshots. In the algorithm, a method is firstly proposed to esti- mates the source number by utilizing the eigenvalues, which are obtained from the autocorrelation matrix of the received dates＇ cross-correlation. Then the new 2D DoA estimation method is proposed. The computer simulations verify the effec- tiveness of the proposed algorithm under low SNR region and with the small number of the snapshots.

关 键 词：波达方向估计 低信噪比 小快拍数 信源个数 

分 类 号：TN911.23[电子电信—通信与信息系统]