NDLI: Dynamic interference-limited relay sharing in cognitive radio networks by using hierarchical modulation

Content Provider	IET Digital Library
Author	Khakzad, Hamidreza Taherpour, Abbas Shakeri, Reza Khattab, Tamer
Abstract	Sharing a relay in cognitive radio (CR) networks in order to enhance the secondary user's (SU's) performance in an interference-limited scheme is investigated. It is assumed, by utilising hierarchical modulation, a shared relay is used simultaneously between both primary user (PU) and SU. The proposed scheme relies on both power adaptation and rate scheduling. Based on channel side information and tolerable interference limitation at the PU, the SU adapts its power and the transmission data rates are regulated by the PU's status and channels condition. Theoretical analyses and simulation results are provided to evaluate the performance of the proposed dynamic spectrum sharing scheme. It is shown that rate adaptation leads to significant improvement of the throughput of the SU, at the cost of negligible degradation in performance of the PU. The results also demonstrate that sharing CR relay with the PU can compensate the side effects of spectrum sharing and interference caused by the SU, which for instance is equivalent to ∼8 dB (low signal-to-noise ratio (low-SNR) regime) and to 15 dB (high-SNR regime) SNR improvement.
Starting Page	1903
Ending Page	1912
Page Count	10
ISSN	17518628
Volume Number	11
e-ISSN	17518636
Issue Number	Issue 12, Aug (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-com/11/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-com.2016.0816
Journal	IET Communications
Publisher Date	2017-05-08
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Channel Side Information Cognitive Radio Cognitive Radio Network Dynamic Interference-limited Relay Sharing Dynamic Spectrum Sharing Scheme Electromagnetic Compatibility Hierarchical Modulation Interference Power Adaptation Primary User Radio Frequency Interference Radio Link And Equipment Radio Network Radio Spectrum Management Rate Adaptation Rate Scheduling Relay Network Secondary User Performance Signal to Noise Ratio SNR Telecommunication Telecommunication Scheduling Transmission Data Rates
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering Computer Science Applications

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