Radio resource allocation for uplink OFDMA systems with finite symbol alphabet inputs

Al-Imari, M., Xiao, P., Imran, M. A. and Tafazolli, R. (2014) Radio resource allocation for uplink OFDMA systems with finite symbol alphabet inputs. IEEE Transactions on Vehicular Technology, 63(4), pp. 1917-1921. (doi:10.1109/TVT.2013.2287809)

[img]
Preview
Text
136185.pdf - Accepted Version

206kB

Abstract

In this paper, we consider the radio resource allocation problem for uplink orthogonal frequency-division multiple-access (OFDMA) systems. The existing algorithms have been derived under the assumption of Gaussian inputs due to its closed-form expression of mutual information. For the sake of practicality, we consider the system with finite symbol alphabet (FSA) inputs and solve the problem by capitalizing on the recently revealed relationship between mutual information and minimum mean square error (MMSE). We first relax the problem to formulate it as a convex optimization problem, and then, we derive the optimal solution via decomposition methods. The optimal solution serves as an upper bound on the system performance. Due to the complexity of the optimal solution, a low-complexity suboptimal algorithm is proposed. Numerical results show that the presented suboptimal algorithm can achieve performance very close to the optimal solution and that it outperforms the existing suboptimal algorithms. Furthermore, using our proposed algorithm, significant power saving can be achieved in comparison to the case when a Gaussian input is assumed.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Imran, Professor Muhammad
Authors: Al-Imari, M., Xiao, P., Imran, M. A., and Tafazolli, R.
College/School:College of Science and Engineering > School of Engineering
Journal Name:IEEE Transactions on Vehicular Technology
Publisher:IEEE
ISSN:0018-9545
ISSN (Online):1939-9359
Published Online:30 October 2013
Copyright Holders:Copyright © 2013 IEEE
First Published:First published in IEEE Transactions on Vehicular Technology 63(4): 1917-1921
Publisher Policy:Reproduced in accordance with the publisher copyright policy

University Staff: Request a correction | Enlighten Editors: Update this record