Enhancing Location Estimation Accuracy Using Cooperative Relay Station In WiMAX

Yit, Sin Nee (2015) Enhancing Location Estimation Accuracy Using Cooperative Relay Station In WiMAX. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Location and Positioning (L&P) based services plays an important role in wireless communication system. Many researches were done to enhance the location estimation accuracy, but much improvements are yet to be done to satisfy the requirement of Federal Communications Commission (FCC). In wireless communication system, location estimation accuracy can be increased by utilizing more base stations (BS), however there are some restrictions such as high building cost of BS. In this project, a novel technique is developed, where through the usage of relay station (RS) in Worldwide Interoperability for Microwave Access (WiMAX) network, the location estimation accuracy can be enhanced by using only one BS and two RSs. An algorithm including four main parts for locating the coordinates of BSs, RSs and mobile stations (MS), time of arrival (TOA) estimation based on two non-light-of-sight (NLOS) error calibration method, generating the NLOS error using Circular Disk Scatterer Model (CDSM), and calculating the location estimation error using Linear Least Square (LLS) and Non Linear Least Square (NLLS) method. An algorithm to select the suitable RS location is developed as well. Simulation results shown that the location estimation accuracy for the deployment of one BS and two RSs is the best among all the cases. The result obtained will lead to a major development to the location estimation technologies in WiMAX network.

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