Title :
Margin adaptive resource allocation with long-term rate fairness considered in downlink OFDMA systems
Author :
Hou, Liming ; Lin, Xiaokang
Author_Institution :
Dept. of Electron. & Eng., Tsinghua Univ., Beijing, China
Abstract :
In this paper, a suboptimal resource allocation algorithm is proposed with considered the long-term fairness in the downlink of the multiuser OFDM systems. The intention of this work is to minimize the total transmission power under the constraint of the target system data rate. After formulating the optimization problem, the subcarrier allocation algorithm, considered long-term rate fairness, is proposed with a water-filling bit assignment method. In order to guarantee the long-term fairness, the average date rate is introduced to weight the allocating factor in the process of the subcarrier allocation. Furthermore, the water-filling factor is also derived by a novel method in bit assignment procedure. In a conclusion, compared with the convention short term fairness algorithm, the proposed scheme not only guarantees the long term fairness, but also saves the power consumption obviously. The simulation results have shown the advanced performance of the proposed algorithm.
Keywords :
OFDM modulation; Rayleigh channels; frequency division multiple access; minimisation; multiuser channels; resource allocation; Rayleigh fading channel; downlink OFDMA system; long-term rate fairness; margin adaptive resource allocation; multiuser OFDM system; optimization problem; subcarrier allocation algorithm; total transmission power minimization; water-filling bit assignment method; Bit error rate; Data communication; Downlink; Educational institutions; Energy consumption; Frequency conversion; OFDM; Optimization methods; Quality of service; Resource management; OFDMA; dynamical resource allocation; long-term fairness; water-filling rate allocation;
Conference_Titel :
EUROCON 2009, EUROCON '09. IEEE
Conference_Location :
St.-Petersburg
Print_ISBN :
978-1-4244-3860-0
Electronic_ISBN :
978-1-4244-3861-7
DOI :
10.1109/EURCON.2009.5167909