Title :
Estimation of directions of arrival of multipath signals in CDMA systems
Author :
Lei, Zhongding ; Lim, Teng Joon
Author_Institution :
Center for Wireless Commun., Nat. Univ. of Singapore, Singapore
fDate :
6/1/2000 12:00:00 AM
Abstract :
An algorithm is proposed for estimating the directions of arrival (DOAs) of multipath signals received from multiple users on the uplink of a code-division multiple-access system. The correlation matrices of the received signal before and after code-matched filtering are used to provide unique estimates even when the number of required DOAs exceeds the number of antenna array elements. This scenario is well known to cause conventional direction-finding algorithms (such as MUSIC) to fail. Both intersymbol interference (ISI) and multiple-access interference (MAI) are modeled exactly, and so the algorithm performs much better than those which model ISI and MAI as Gaussian noise
Keywords :
AWGN; array signal processing; code division multiple access; correlation methods; direction-of-arrival estimation; filtering theory; intersymbol interference; land mobile radio; matched filters; matrix algebra; multipath channels; multiuser channels; radio links; radiofrequency interference; spread spectrum communication; DOA estimation algorithm; DS-CDMA systems; Gaussian noise; ISI; MUSIC; antenna array elements; code-division multiple-access; code-matched filtering; correlation matrices; direction-finding algorithms; directions of arrival estimation; interference suppression; intersymbol interference; multipath signals; multiple-access interference; received signal; uplink; Antenna arrays; Direction of arrival estimation; Filtering; Gaussian noise; Intersymbol interference; Multiaccess communication; Multiple access interference; Multiple signal classification; Navigation; Receiving antennas;
Journal_Title :
Communications, IEEE Transactions on
