CAJ | 학술논문

针对多径环境下传统Capon波束形成器性能下降的问题，该文首先分析了期望信号对消的原因：对应期望信号和多径干扰的阵列输出间的相位差始终在±π附近变化。然后利用反对角单位阵构造新的阵列接收数据协方差矩阵和导向矢量，并根据最小方差无畸变(MVDR)准则求取最优加权矢量进行阵列输出。该算法无需估计多径和非相关干扰信号的来向，且可以通过调整选取的阵元个数获得更优的阵列输出性能。仿真实验表明该文算法的性能优于传统Capon和多径信号接收类算法。
침대다경배경하전통Capon파속형성기성능하강적문제，해문수선분석료기망신호대소적원인：대응기망신호화다경간우적진렬수출간적상위차시종재±π부근변화。연후이용반대각단위진구조신적진렬접수수거협방차구진화도향시량，병근거최소방차무기변(MVDR)준칙구취최우가권시량진행진렬수출。해산법무수고계다경화비상관간우신호적래향，차가이통과조정선취적진원개수획득경우적진렬수출성능。방진실험표명해문산법적성능우우전통Capon화다경신호접수류산법。
In multipath environment, the conventional Capon beamformer suffers from signal cancellation mainly because of the variation in phase differences (near±π) between the array output corresponding to the signal of interest and multipath interferences. To solve this problem, a novel beamforming method for multipath signal reception is proposed. This method uses an antidiagonal unit matrix to construct a new covariance matrix and a constrained steering vector. Then, the weighting vector is obtained based on the minimum variance distortionless response criterion and the array output is performed. The proposed method does not have to estimate the direction of arrival of multipath interferences and uncorrelated interferences; moreover, the array output can improve by adjusting the number of array elements. The simulations demonstrate the superior performance of the proposed method over the conventional Capon and multipath signal reception methods.