Theoretical Analysis of Power Saving In Cognitive Radio with Arbitrary Inputs
Sohail, A, Al-Imari, M, Xiao, P and Evans, BG (2014) Theoretical Analysis of Power Saving In Cognitive Radio with Arbitrary Inputs IEEE Transactions on Vehicular Technology.
|
Text
IEEE_tvt_ahmed.pdf - ["content_typename_Submitted version (pre-print)" not defined] Available under License : See the attached licence file. Download (112kB) | Preview |
|
|
Text (licence)
SRI_deposit_agreement.pdf Available under License : See the attached licence file. Download (33kB) | Preview |
Abstract
In Orthogonal Frequency Division Multiplexing (OFDM) based cognitive radio systems, power optimization algorithms have been evaluated to maximize the achievable data rates of the Secondary User (SU). However, unrealistic assumptions are made in the existing work, i.e. a Gaussian input distribution and traditional interference model that assumes frequency division multiplexing modulated Primary User (PU) with perfect synchronization between the PU and the SU. In this paper, we first derive a practical interference model by assuming OFDM modulated PU with imperfect synchronization. Based on the new interference model, the power optimization problem is proposed for the Finite Symbol Alphabet (FSA) input distribution (i.e., M-QAM), as used in practical systems. The proposed scheme is shown to save transmit power and to achieve higher data rates compared to the Gaussian optimized power allocation and the uniform power loading schemes. Furthermore, a theoretical framework is established in this paper to estimate the power saving by evaluating optimal power allocation for the Gaussian and the FSA input. Our theoretical analysis is verified by simulations and proved to be accurate. It provides guidance for the system design and gives deeper insights into the choice of parameters affecting power saving and rate improvement.
Item Type: | Article |
---|---|
Divisions : | Faculty of Engineering and Physical Sciences > Electronic Engineering > Centre for Communication Systems Research |
Authors : | Sohail, A, Al-Imari, M, Xiao, P and Evans, BG |
Date : | 10 July 2014 |
DOI : | 10.1109/TVT.2014.2338054 |
Additional Information : | © 2014 IEEE. Author's version of an article accepted for publication in IEEE Transactions on Vehicular Technology. 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 : | 05 Aug 2014 10:45 |
Last Modified : | 06 Jul 2019 05:14 |
URI: | http://epubs.surrey.ac.uk/id/eprint/805749 |
Actions (login required)
![]() |
View Item |
Downloads
Downloads per month over past year