A Simulation Testbed for Performance Evaluation of Open Loop Power Control Algorithms for Cellular CDMA

ABSTRACT Power control algorithms are very important for increasing the average traffic and quality of service in CDMA systems. Recently some interesting open loop power control schemes, namely ‘Power Truncation’ and ‘Power Limitation’ have been proposed. The paper describes a simulation testbed developed for carrying out performance studies on the two algorithms. It also verifies some of the analytical results. 1. Introduction Power control can substantially impact the cellular capacity and quality of service in cellular CDMA systems. Several power control algorithms have been suggested in the literature [1-2]. Conventionally each mobile estimates the channel power gain G(t) at time t and adjusts the transmit power such that a target received power S R is received at the base station(BS). In this method a mobile may be required to transmit a large average power to compensate for deep fading. Thereby the interference caused to other cells by the boundary mobiles increases. Recently one interesting power control algorithm called ‘Truncated power control’ has been suggested in [3] to overcome the above-mentioned problem. According to this algorithm a user adjusts its transmit power to compensate for the channel power gain above a certain cut off fade depth γ