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.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-04132005-181109 |
| Date | 21 April 2005 |
| Creators | Sharma, Rohit |
| Contributors | Xue-Bin Liang, Morteza Naraghi-Pour, Guoxiang Gu |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-04132005-181109/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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