Green communication has emerged as one of the most important research topics for radio systems. This leads us to develop an energy-efficient mechanism that adjusts transmission power according to the traffic load and reduces the energy per bit usage. For the vision of Europe 2020 as a smart, sustainable, and inclusive economy to become reality, the EU has set forth the 20:20:20 targets by which greenhouse gas emissions and energy reduction of primary use should be reduced by 20% while 20% of energy consumption should come from renewable resources.