Type of Document	Master's Thesis
Author	Sharma, Rohit
Author's Email Address	rohitspage@yahoo.com
URN	etd-04132005-181109
Title	Effect of Multiuser Interference on Subscriber Location in CDMA Networks
Degree	Master of Science in Electrical Engineering (M.S.E.E.)
Department	Electrical & Computer Engineering
Advisory Committee	Advisor Name Title Morteza Naraghi-Pour Committee Chair Guoxiang Gu Committee Member Xue-Bin Liang Committee Member
Keywords	radiolocation subscriber location ToA estimation position estimator simulated annealing Gaussian approximation home base station non-home base station non-linear least squares steepest descent shadowing losses time of arrival intercellular interference intracellular interference Matlab mathematical model MAI multi user interference MAI CDMA per user interference
Date of Defense	2005-04-07
Availability	unrestricted
Abstract The last few years have witnessed an ever growing interest in the field of mobile location systems for cellular systems. The motivation is the series of regulations passed by Federal Communications Commission, requiring that wireless service providers support a mobile telephone callback feature and cell site location mechanism. A further application of the location technology is in the rapidly emerging field of intelligent transportation systems, which are intended to enhance highway safety, location based billing etc. Many of the existing location technologies use GPS and its derivatives which require a specialized subscriber equipment. This is not feasible for popular use, as the cost of such equipments is very high. Hence, for a CDMA network, various methods have been studied that use the cellular network as the sole means to locate the mobile station (MS), where the estimates are derived from the signal transmitted by the MS to a set of base station's (BS) This approach has the advantage of requiring no modifications to the subscriber equipment. While subscriber location has been previously studied for CDMA networks, the effect of multiple access interference has been ignored. In this thesis we investigate the problem of subscriber location in the presence of multiple access interference. Using MATLAB as a simulation tool, we have developed an extensive simulation technique which measures the error in location estimation for different network and user configurations. In our studies we include the effects of log-normal shadow and Rayleigh fading. We present results that illustrate the effects of varying shadowing losses, number of BS's involved in position location, early-late discriminator offset and cell sizes in conjunction with the varying number of users per cell on the accuracy of radiolocation estimation.
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