Title :
A Novel Subspace based Method for Direction of Arrival Estimation of Signals in a Multi-Path CDMA System
Author :
Beygi, Maryam Abolfath ; Olfat, Ali
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Tehran, Tehran
Abstract :
This paper presents a method for finding the directions of arrival of coherent signals in a multi-path asynchronous DS-CDMA system. The method is a time-space processing method and works with the temporal-spatial signatures of the signals. It is a blind method which exclusively uses the desired user´s spreading code sequence and the path delays of the desired user to eliminate the contribution of undesired paths. The basic idea is to exploit the desired user´s temporal characteristics to apply a linearly transformation to the existing signal subspace to find a new subspace onto which the desired path´s signal´s temporal-spatial signature lies. Once it is accomplished, the well-known MUSIC algorithm can be applied to find the desired direction of arrival. For evaluation purposes, some simulation results are presented.
Keywords :
code division multiple access; direction-of-arrival estimation; signal classification; spread spectrum communication; MUSIC algorithm; blind method; coherent signals; direction of arrival estimation; multipath CDMA system; multipath asynchronous DS-CDMA system; signal subspace; spreading code sequence; subspace based method; temporal-spatial signatures; time-space processing method; Array signal processing; Delay; Direction of arrival estimation; Interference; Multiaccess communication; Multiple signal classification; Receiving antennas; Signal processing; Signal processing algorithms; Signal resolution; CDMA system; Coherent signals; MUSIC algorithm; Subspace methods; Temporal spatial signature;
Conference_Titel :
Sarnoff Symposium, 2008 IEEE
Conference_Location :
Princeton, NJ
Print_ISBN :
978-1-4244-1843-5
DOI :
10.1109/SARNOF.2008.4520110
