Title :
Cramer-Rao bound for location estimation of a mobile in asynchronous DS-CDMA systems
Author :
Botteron, Cyril ; Høst-Madsen, Anders ; Fattouche, Michel
Author_Institution :
Dept. of Electr. & Comput. Eng., Calgary Univ., Alta., Canada
Abstract :
Commercial applications for the location of subscribers of wireless services continue to expand. Consequently, finding the Cramer-Rao bound (CRB), which serves as an optimality criterion for the location estimation problem, is of interest. We derive the CRB for the estimation of channel parameters and mobile position in an asynchronous direct sequence code division multiple access (DS-CDMA) system operating over fading channels. It is assumed that the location estimates are obtained from the bearings and/or propagation delays estimated at one or more cluster(s) of antenna arrays of arbitrary geometry. Among other applications, the CRB on the positioning accuracy may serve as a design tool to find an optimum antenna placement, or to evaluate the practicability of a legal demand for emergency location
Keywords :
antenna arrays; code division multiple access; delay estimation; direction-of-arrival estimation; mobile radio; optimisation; spread spectrum communication; CRB; CramerRao bound; antenna array; asynchronous DS-CDMA; bearing estimation; channel parameter estimation; direct sequence code division multiple access; emergency location; fading channels; location estimation; mobile position; optimality criterion; propagation delay estimation; wireless services; Antenna arrays; Antennas and propagation; Delay estimation; Direct-sequence code-division multiple access; Fading; Geometry; Law; Multiaccess communication; Parameter estimation; Propagation delay;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2001. Proceedings. (ICASSP '01). 2001 IEEE International Conference on
Conference_Location :
Salt Lake City, UT
Print_ISBN :
0-7803-7041-4
DOI :
10.1109/ICASSP.2001.940439
