Title :
A Rate-Difference Based Energy-Efficient Resource Allocation Algorithm for Downlink OFDMA Systems
Author :
Xiao Liang ; Guixia Kang ; Minliang Li ; Jing Wang ; Yingjiao Zhao
Author_Institution :
Beijing Univ. of Posts & Telecommun., Beijing, China
Abstract :
For the limitation of resource and the requirement of environment, energy-efficient OFDMA systems gradually play an important role in wireless communication. In this paper, we present a novel resource allocation algorithm for downlink energy-efficient OFDMA systems, under the given QoS requirement and power limitation constraints. Compared with the existing works, we propose a sub carrier and power allocation scheme from the perspective of rate-difference and suggest a simple algorithm to find the solution with fewer iteration times. The algorithm includes two parts: the Rate-Difference Based Sub carrier Assignment Algorithm (RBSA) and the Rate-Difference Based Power Allocation Algorithm (RBPA). It can be seen that the general trend of maximum energy efficiency decreases with larger ε and fluctuates between the maximum value and zero, where ε is the proportional power parameter. The simulation results show the significant improvement of energy efficiency with the proposed schemes and demonstrate the effectiveness of the proposed algorithms.
Keywords :
OFDM modulation; channel allocation; energy conservation; frequency division multiple access; quality of service; radiocommunication; telecommunication power management; QoS requirement; energy efficient resource allocation algorithm downlink OFDMA Systems; maximum energy efficiency; power limitation constraints; rate difference based power allocation algorithm; rate difference based resource allocation; rate difference based subcarrier assignment algorithm; subcarrier allocation; wireless communication; Algorithm design and analysis; Downlink; Energy efficiency; OFDM; Quality of service; Resource management; Wireless communication; Energy Efficiency; OFDMA; downlink; rate-difference; resource allocation;
Conference_Titel :
Computational Intelligence and Design (ISCID), 2013 Sixth International Symposium on
Conference_Location :
Hangzhou
DOI :
10.1109/ISCID.2013.166