Performance analysis of closed loop uplink power control schemes in cellular radio system

Transmit Power control plays an important role to reduce the co-channel interference, minimizing the near-far effect and maintaining the quality of service (QoS) of cellular radio system. In this paper several closed loop uplink power control schemes are analyzed for different speed mobile users in cellular radio system. We aim at solving the trade-off between conflicting constraints on the bounds of the two relevant variables of the cellular system - the uplink power and the signal-to-interference plus noise ratio (SINR) - that is to keep on maintaining the SINR at a high value with a low power. This paper focuses on the performance comparisons of different feedback controllers i.e. Relay control, PID control, Self-predictive and Fuzzy based controllers used in uplink power control for the pedestrian and high-speed mobile users. The performances of the different feedback uplink power control schemes are investigated in three different ways i.e. comparing the SINR responses, MSE responses and computing the outage probabilities using the simulation in MATLAB Simulink^® models. After proper investigation and analysis it is anticipated that the significant performance improvement is achieved by using fuzzy based uplink power control scheme in both low-speed as well as high-speed mobile scenario.