Fair subcarrier-power allocation scheme for multiuser multicarrier systems
来源期刊：中南大学学报(英文版)2015年第8期
论文作者：Mohammed Abd-Elnaby Germien G. Sedhom Nagy W. Messiha Xu Zhu Fathi E. Abd El-Samie
文章页码：3033 - 3041
Key words：multiuser orthogonal frequency division multiple access (MU-OFDM); subcarrier-allocation; power allocation; fairness; capacity
Abstract: The main objective of multiuser orthogonal frequency division multiple access (MU-OFDM) is to maximize the total system capacity in wireless communication systems. Thus, the problem in MU-OFDM system is the adaptive allocation of the resources (subcarriers, bits and power) to different users subject to several restrictions to maximize the total system capacity. In this work, a proposed subcarrier allocation algorithm was presented to assign the subcarriers with highest channel gain to the users. After the subcarrier allocation, subcarrier gain-based power allocation (SGPA) was employed for power and bit loading. The simulation results show that the proposed subcarrier-power allocation scheme can achieve high total system capacity and good fairness in allocating the resources to the users with slightly high computational complexity compared to the existing subcarrier allocation algorithms.
Mohammed Abd-Elnaby1, Germien G. Sedhom1, Nagy W. Messiha1, Xu Zhu2, Fathi E. Abd El-Samie1
(1. Faculty of Electronic Engineering, Menoufia University, Menouf 32952, Egypt;
2. Deptartment of Electrical Engineering and Electronics, University of Liverpool, L69 3GJ, UK)
Abstract:The main objective of multiuser orthogonal frequency division multiple access (MU-OFDM) is to maximize the total system capacity in wireless communication systems. Thus, the problem in MU-OFDM system is the adaptive allocation of the resources (subcarriers, bits and power) to different users subject to several restrictions to maximize the total system capacity. In this work, a proposed subcarrier allocation algorithm was presented to assign the subcarriers with highest channel gain to the users. After the subcarrier allocation, subcarrier gain-based power allocation (SGPA) was employed for power and bit loading. The simulation results show that the proposed subcarrier-power allocation scheme can achieve high total system capacity and good fairness in allocating the resources to the users with slightly high computational complexity compared to the existing subcarrier allocation algorithms.
Key words:multiuser orthogonal frequency division multiple access (MU-OFDM); subcarrier-allocation; power allocation; fairness; capacity
