Copyright © 2008 The Institute of Electronics, Information and Communication Engineers
Regular Section -- Papers -- Wireless Communication Technologies |
Resource Allocation Scheme in MIMO-OFDMA System for User's Different Data Throughput Requirements
1 The authors are with the Department of Information and Computer Science, Keio University, Yokohama-shi, 223-8522 Japan. E-mail: sannmaw{at}sasase.ics.keio.ac.jp; sasase{at}ics.keio.ac.jp
In the subcarrier and power allocation schemes in Multi-Input Multi-Output and Orthogonal Frequency Division Multiple Access (MIMO-OFDMA) systems, only equal fairness among users has been considered and no scheme for proportional data rate fairness has been considered. In this paper, a subcarrier, bit and power allocation scheme is proposed to maximize the total throughput under the constraints of total power and proportional data rate fairness among users. In the proposed scheme, joint subchannel allocation and adaptive bit loading is firstly performed by using singular value decomposition (SVD) of channel matrix under the constraint of users' data throughput requirements, and then adaptive power loading is applied. Simulation results show that effective performance of the system has been improved as well as each throughput is proportionally distributed among users in MIMO-OFDMA systems.
Key Words: adaptive resource allocation, MIMO, OFDMA, SVD
Manuscript received April 13, 2007. Manuscript revised August 17, 2007.
Reference
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