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)

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