NDLI: Cognitive two-way relaying using orthogonal channelisation: spectrum partition, subchannel permutation, and power allocation

Content Provider	IET Digital Library
Author	Li, Yong Wang, Tingting Lu, Na
Abstract	In cognitive radio networks, primary users can share some licensed spectrums with secondary users in exchange for cooperation. In this study, an overlay scenario is investigated where a secondary node provides two-way relaying service to a pair of primary users and thus is allowed to transmit its own messages by using some licensed spectrums. Orthogonal channelisation is assumed for the two-way relay channel to form a number of parallel subchannels. Hence, the licensed spectrums can be partitioned between primary and secondary signals transmitted by the relay in the broadcast phase. Moreover, subchannels in the two phases of two-way relaying can be permutated to further improve performance. The authors seek to maximise achievable data rate of secondary transmission subject to data rate requirements of the two primary users under individual power constraints. The joint spectrum partition, subchannel permutation, and power allocation problem is formulated into a mixed combinatorial programming problem, which is then transformed into a solvable form and finally yield an asymptotically optimal solution through dual decomposition method. They further prove that the solution to the relaxed problem is exactly the same as that to the original problem. Numerical results demonstrate performance gain of the proposed algorithm.
Starting Page	495
Ending Page	501
Page Count	7
ISSN	17518628
Volume Number	10
e-ISSN	17518636
Issue Number	Issue 5, Mar (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/10/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2015.0364
Journal	IET Communications
Publisher Date	2016-03-24
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Achievable Data Rate Maximisation Cognitive Radio Cognitive Radio Network Cognitive Two-way Relaying Combinatorial Mathematics Data Rate Requirements Dual Decomposition Method Joint Spectrum Partition Legislation, Frequency Allocation And Spectrum Pollution Licensed Spectrums Mixed Combinatorial Programming Problem Nonoverlapping Spectrum Partition Constraint Optimisation Optimisation Technique Orthogonal Channelisation Parallel Subchannels Power Allocation Power Allocation Problem Radio Link And Equipment Radio Spectrum Management Relaxed Problem Relay Network Telecommunication Two-way Relay Channel Wireless Channel
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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