Energy-Efficient Subcarrier-and-Bit Allocation in Multi-User OFDMA Systems
Energy efficiency is becoming increasingly important for wireless communication systems in order to minimize carbon footprint of wireless networks and to increase the battery life of mobile terminals. The spectral-energy efficiency trade-off is of primary significance to determine how much energy per bit is required in a wireless communication system to achieve a specific spectral efficiency. In this paper, the authors study energy-efficient resource allocation scheme for Orthogonal Frequency-Division Multiple Access (OFDMA) systems with multiple users. The trade-off between spectral and energy efficiencies is analyzed under the constraint of maintaining the fairness among users. They first formulate the energy-efficient optimization problem as an integer fractional programming.