Two-Stage Adaptive Relay Selection and Power Allocation Strategy for Cooperative CR-NOMA Networks in Underlay Spectrum Sharing
Source abstract
Abstract
In this paper, we consider a novel cooperative underlay cognitive radio network based on non-orthogonal multiple access (CR-NOMA) with adaptive relay selection and power allocation. In secondary networks, dedicated relay assistance and user assistance are used to achieve communication between the base station and the far (and near) user. Here, a two-stage adaptive relay selection and power allocation strategy is proposed to maximize the achievable data rate of the far user while ensuring the service quality of near user. Furthermore, the closed-form expressions of outage probability of two secondary users are derived, respectively, under interference power constraints, revealing the impact of transmit power, number of relays, interference threshold and target data rate on system outage probability. Numerical results and simulations validate the advantages of the established cooperation and show that the proposed adaptive relay selection and power allocation strategy has better outage performance.
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Research context
OpenAlex topics: Advanced Wireless Communication Technologies · Cooperative Communication and Network Coding · Wireless Communication Security Techniques
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Affiliations
School of Sciences, Lanzhou University of Technology, Lanzhou 730050, China
School of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Department of Communications, Universidad Politécnica de Valencia, 46022 Valencia, Spain
Funding
National Natural Science Foundation of China
References (35)
Show source-provided references
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