DocumentCode :
1745537
Title :
Performance of a TDOA-AOA hybrid mobile location system
Author :
Thomas, N.J. ; Cruickshank, D.G.M. ; Laurenson, D.I.
Author_Institution :
Edinburgh Univ., UK
fYear :
2001
fDate :
2001
Firstpage :
216
Lastpage :
220
Abstract :
A time difference of arrival (TDOA) technique has been proposed for providing location services in future UMTS networks. The performance of such a system is limited by errors in the time difference (TD) measurements primarily cause by non-line of sight (NLOS) propagation conditions. In future systems angle of arrival (AOA) measurements at the serving base station (BS) may be available, primarily as a requirement to increase downlink capacity via beamforming. These measurements may also be useful far location purposes, though they will also be subject to errors caused by NLOS propagation conditions between the mobile (MS) and the serving BS. In this paper the performance improvement of a TDOA location system utilising the AOA measurement from the serving BS, over a TDOA only system is evaluated. Simulation results are presented which show that location accuracy improvement is possible even in highly NLOS conditions. Furthermore location estimation is now possible when only two BSs are detectable, rather than the three BSs required in the TDOA only system, thus increasing the coverage of the system
Keywords :
angular measurement; array signal processing; channel capacity; land mobile radio; radio direction-finding; radio links; radiowave propagation; AOA measurement; AOA measurements; NLOS propagation conditions; TDOA-AOA hybrid mobile location system; UMTS networks; angle of arrival measurements; base station; beamforming; downlink capacity; location accuracy; location services; mobile station; nonline of sight propagation; simulation results; system coverage; system performance; time difference measurement errors; time difference of arrival;
fLanguage :
English
Publisher :
iet
Conference_Titel :
3G Mobile Communication Technologies, 2001. Second International Conference on (Conf. Publ. No. 477)
Conference_Location :
London
ISSN :
0537-9989
Print_ISBN :
0-85296-731-4
Type :
conf
DOI :
10.1049/cp:20010044
Filename :
923541
Link To Document :
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