Title :
Determination of the direction of arrival (DOA) and of the user through a single algorithm EM in CDMA systems
Author :
Zelenovsky, R. ; Lima, Andre G M ; Menezes, Leonardo R A X ; Grivet, M.A.
Author_Institution :
Brasilia Univ., Brazil
Abstract :
Smart antennas are an important factor for wireless improvement because they allow the reduction of interference and so increase the capacity of the cell. A related problem to these antennas is the determination of the direction of arrival (DOA) of a signal. This problem has been solved through several algorithms. When a CDMA environment is used, however, the techniques offer weak DOA estimation, because they are not able to do a code separation. This work intends to show this problem and propose a technique for estimation of DOA in a CDMA multiuser environment.
Keywords :
adaptive antenna arrays; code division multiple access; direction-of-arrival estimation; multiuser channels; optimisation; CDMA systems; DOA estimation; EM algorithm; direction of arrival; mobile communication; multiuser environment; smart antennas; AWGN; Additive white noise; Antenna arrays; Delay estimation; Direction of arrival estimation; Directive antennas; Interference; Multiaccess communication; Signal processing; Signal to noise ratio;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2004. IEEE
Print_ISBN :
0-7803-8302-8
DOI :
10.1109/APS.2004.1329661
