Title :
Improved wireless location accuracy using antenna arrays and interference cancellation
Author :
Tarighat, Alireza ; Khajehnouri, Nima ; Sayed, Ali H.
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
Location finding for CDMA subscribers using an antenna array at the base station is studied. Two methods are considered for radio location that are based on time of arrival (TOA) and angle of arrival (AOA) measurements. For TOA estimates, a maximum likelihood algorithm and a practical structure are proposed when an antenna array is available. For AOA estimates, a least-squares (LS) algorithm is used. The LS module is combined with a multiple access interference (MAI) cancellation technique to improve the AOA estimation accuracy in multiuser multipath scenarios.
Keywords :
antenna arrays; array signal processing; code division multiple access; direction-of-arrival estimation; interference suppression; maximum likelihood estimation; mobile radio; multipath channels; multiuser channels; radio direction-finding; radiofrequency interference; CDMA subscriber location finding; E911; MAI cancellation; angle of arrival estimation; base station antenna array; least-squares algorithm; maximum likelihood algorithm; mobile telephones; multipath scenarios; multiple access interference cancellation; multiuser scenarios; radio location; time of arrival estimation; wireless location accuracy; Antenna arrays; Antenna measurements; Base stations; FCC; Interference cancellation; Maximum likelihood estimation; Multiaccess communication; Multiple access interference; Time measurement; Wireless communication;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on
Print_ISBN :
0-7803-7663-3
DOI :
10.1109/ICASSP.2003.1202718
