用一种新的空时导向矢量联合估计CDMA信号波达方向与多径时延

Joint Estimation of DOA and Multipath Time Delay Using the New Space-Time Steering Vector for CDMA System

本文针对CDMA系统提出了一种不需要训练信号而直接对接收的正常通信信号进行处理,实现感兴趣用户的波达方向(DOA)与多径时延联合估计的新方法.该方法是一种基于空时二维的MUSIC方法,首先建立了一种新的数据结构,并对其形成的相关矩阵进行特征分解,然后采用构造的新导向矢量对特征空间进行搜索.这种方法克服了要求接收信号数小于阵元数的局限,能有效估计时延不同、波达方向相差很小的多径信号的参数.

In this paper, based on the space-time two dimensional MUSIC algorithm, a new method utilizing the received information of user instead of pilot signal during the period of normal communication is proposed to estimate DOA and multipath time delay of the signal of interesting (SOI) user in CDMA system. The eigenvalues and eigenvectors of the covariance matrix formed by a new data model is computed first, then the DOA and time delay can be found by searching noise subspace with a new steering vector. It is not required that the number of the received signals be less than that of the array elements. The DOA closed in space (or the same DOA) and multipath time delay of the SOI of different time delay can be estimated.