NDLI: Power allocation optimisation for high throughput with mixed spectrum access based on interference evaluation strategy in cognitive relay networks

Content Provider	IET Digital Library
Author	Jiang, Xianyang Shen, Lei Xu, Xiaorong Bao, Jianrong Yao, Yu Dong Zhao, Zhijin
Abstract	By introducing amplify-and-forward relaying into a cognitive radio system, typical cognitive relay networks are studied for the optimisation problems of the spectrum and power allocation. By applying the mixed spectrum access of overlay and underlay approaches, an interference evaluation strategy is proposed to use different spectrum and power allocation methods while the secondary users (SUs) are located in different service regions of the primary users (PUs). In the interference evaluation strategy, the service area of the PUs is divided according to the possible interference strength of the PUs from the SUs compared with the location-aware strategy in which the service area is divided only by the location information. An optimal power allocation algorithm is developed to maximise the throughput of the SUs under the condition of anti-interference performance of the PUs and the total power constraints of the SUs. A type of computing algorithm that joins the subgradient and the Newton's method is used in order to resolve the complex optimisation problem. Numerical results show that the performance using the interference evaluation strategy, such as the throughput, the power consumption, and the energy efficiency, outperforms that using the location-aware strategy.
Starting Page	1428
Ending Page	1435
Page Count	8
ISSN	17518628
Volume Number	10
e-ISSN	17518636
Issue Number	Issue 12, Aug (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/10/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2015.0849
Journal	IET Communications
Publisher Date	2016-08-11
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Amplify And Forward Communication Amplify-and-forward Relaying Method Cognitive Radio Cognitive Radio System Cognitive Relay Network Electromagnetic Compatibility Interference Interference Evaluation Strategy Location-aware Strategy Mixed Spectrum Access Mobile Radio System Optimal Power Allocation Algorithm Optimisation Optimisation Problem Optimisation Technique Power Allocation Optimisation Radio Frequency Interference Relay Network Spread Spectrum Communication Telecommunication
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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