Title :
Observed time difference (OTD) estimation for mobile positioning in IS-136 in the presence of BTS clock drift
Author :
Wylie-Green, Marilynn P. ; Wang, S.S.
Author_Institution :
Nokia Res. Center, Irving, TX, USA
fDate :
6/23/1905 12:00:00 AM
Abstract :
The enhanced observed time difference (E-OTD) method is one of the emergency positioning technologies that has been standardized for GSM systems in the USA. In this paper, we apply the E-OTD approach to a (30 kHz) IS-136 TDMA system in order to study the effect of BTS clock drift on OTD estimation accuracy. We show that the presence of a constant BTS clock drift systematically biases the OTD estimates and causes the RMS OTD error to grow with increasing observation time
Keywords :
cellular radio; direction-of-arrival estimation; BTS clock drift; GSM systems; IS-136 TDMA; OTD estimation; RMS error; emergency positioning; enhanced observed time difference; AWGN; Area measurement; Base stations; Clocks; Coordinate measuring machines; GSM; Position measurement; Time difference of arrival; Time division multiple access; Time measurement;
Conference_Titel :
Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th
Conference_Location :
Atlantic City, NJ
Print_ISBN :
0-7803-7005-8
DOI :
10.1109/VTC.2001.957246
