Mobile Location Estimation in CDMA Cellular Networks by Using Fuzzy Logic

An adaptive fuzzy logic estimator for locating mobiles in a direct sequence code division multiple access (DS/CDMA) cellular system is proposed. The location estimation is based on the measured pilot signal strengths by the mobile station (MS) from a number of nearby base stations (BSs). A smoother, which uses past and current output data from the fuzzy estimator to produce a more accurate estimate, is used to improve the accuracy of the location estimation. Numerical performance results under various path loss and channel shadowing conditions are presented to demonstrate the viability of the proposed fuzzy estimator.