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Radio Resource Allocation for Uplink OFDMA Systems with Finite Symbol Alphabet Inputs

Al-Imari, M, Xiao, P, Imran, MA 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.

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Abstract

In this paper, we consider the radio resource allocation problem for uplink OFDMA system. 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, 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 outperforms the existing suboptimal algorithms. Furthermore, using our proposed algorithm, significant power saving can be achieved in comparison to the case when Gaussian input is assumed.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Communication Systems Research
Authors :
AuthorsEmailORCID
Al-Imari, MUNSPECIFIEDUNSPECIFIED
Xiao, PUNSPECIFIEDUNSPECIFIED
Imran, MAUNSPECIFIEDUNSPECIFIED
Tafazolli, RUNSPECIFIEDUNSPECIFIED
Date : 4 May 2014
Identification Number : 10.1109/TVT.2013.2287809
Additional Information : © 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Depositing User : Symplectic Elements
Date Deposited : 11 Jul 2014 12:51
Last Modified : 12 Aug 2014 10:31
URI: http://epubs.surrey.ac.uk/id/eprint/804340

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