Predictive closed loop power control for mobile CDMA systems

In this paper, a predictive closed power control loop for mobile communication systems is simulated employing actual multiuser interference. The system parameters are derived from those used in a CDMA system uplink transmission at urban mobile speeds. It is shown by COSSAP (Communications Simulation and System Analysis Program of CADIS GmbH, Germany) simulations that when the estimates of the received power level are noisy, and the control loop response is inherently delay-limited, predictive lowpass filtering can be applied to improve the received power level estimates and overall system performance. In this paper, comparative bit error rate, relative transmitter power consumption, received power level estimate behavior and power control action simulation results between a predictive and a conventional control scheme are presented.