Waterfilling Power Control on Proportional Fair Algorithm to Maintain Fairness and Saves Power for MIMO-OFDMA 2×2

Abstract

The energy consumption level become a new consideration in resources management scheme. This works proposed power transmit allocation using waterfilling method combined with proportional fair allocation algorithm on Multiple Input Multiple Output (MIMO) 2×2 OFDMA system. Waterfilling power allocation is a scheme that try to optimize the energy consumption level by giving more transmit power to user that has bad channel condition, and less power to user that good channel condition. The purpose of this waterfilling scheme is to decrease the energy consumption level of the system. This waterfilling power allocation performed on the system after proportional fair allocation algorithm. The proposed system (waterfilling-proportional fair algorithm) is compared with basic proportional fair algorithm with equal power allocation (EPA). Both are tested on varied user and cell radius. Simulation shows that, proposed waterfilling scheme give improvement in fairness by 4.12% and decrease transmitted power by 11.84% or 4.74 watt.