Fuzzy logic based closed loop adaptive power control for minimization of near-far interference in CDMA systems

Abstract

CDMA implementation is widely used in various communication systems because of its high spectral efficiency. But near- far interference proves to be a serious problem tending to reduce the performance of CDMA systems. This problem can be reduced by implementing adaptive power control techniques. In this research paper, fuzzy logic based closed loop adaptive power control has been proposed for minimization of near-far interference. A fuzzy inference system has been developed which gives power control information on the basis of Received Signal Strength Indicator (RSSI), Signal to Noise Ratio (SNR), distance between base station and mobile station and degree of obstacles occurred in communication path. The results reveal that Fuzzy logic based closed loop adaptive power control system minimizes the near-far interference and improves the performance of CDMA systems in terms of spectral efficiency and system capacity.