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Cognitive Radio Systems: Multicarrier Modulation and Power Allocation Challenges

Sohail, A, Al-Imari, M, Xiao, P and Evans, B (2013) Cognitive Radio Systems: Multicarrier Modulation and Power Allocation Challenges Journal of Electrical & Electronic Systems, 3 (1). pp. 1-6.

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Abstract

The rapid development of modern communication services results in high data rate requirements from the end user. It is challenging to meet high data rate requirements because of prevailing issues such as spectrum scarcity and spectrum underutilization due to fixed spectrum assignment policy. Cognitive Radio (CR), being the enabler of dynamic spectrum management techniques, has the capability to tackle these issues by proficiently implementing spectrum sharing schemes using Multicarrier Modulation (MCM) techniques. In CR system, where the Primary User (PU) and the Secondary User (SU) co-exist in the same frequency band, mutual interference (i.e., from SU to PU and vice versa) is a limiting factor on the achievable capacity of both the PU and the SU. Power allocation in MCM based CR systems aims to dynamically control the transmit power on each subcarrier of the SU in order to reduce the mutual interference. Furthermore, combining multiple antennas with MCM is regarded as a very attractive solution for the CR communications to effectively enhance data rate without demanding additional bandwidth and transmit power.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Communication Systems Research
Authors :
AuthorsEmailORCID
Sohail, AUNSPECIFIEDUNSPECIFIED
Al-Imari, MUNSPECIFIEDUNSPECIFIED
Xiao, PUNSPECIFIEDUNSPECIFIED
Evans, BUNSPECIFIEDUNSPECIFIED
Date : 28 October 2013
Identification Number : 10.4172/2332-0796.1000116
Additional Information : © 2013 Sohail A, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Depositing User : Symplectic Elements
Date Deposited : 04 Jul 2014 15:06
Last Modified : 11 Jul 2014 01:33
URI: http://epubs.surrey.ac.uk/id/eprint/805671

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