HYBRID TOA/AOA SCHEMES FOR MOBILE LOCATION IN CELLULAR COMMUNICATION SYSTEMS

Wireless location is to determine the position of the mobile station (MS) in wireless communicationnetworks. Due to the measurements with large errors, location schemes give poorer performance innon-line-of-sight (NLOS) environments. This paper illustrates methods to integrate all the availableheterogeneous measurements to achieve more accurate location estimation. The proposed hybridschemes combine time of arrival (TOA) at seven BSs and angle of arrival (AOA) information at theserving BS to give location estimation of the MS. The schemes mitigate the NLOS effect simply by theweighted sum of the intersections between seven TOA circles and the AOA line without requiring prioriknowledge of NLOS error statistics. Different NLOS models were used to evaluate the proposed methods. It is shown by the simulation results that the proposed methods provide better location accuracycomparing with Taylor series algorithm (TSA) and the hybrid lines of position algorithm (HLOP).