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Joint Power and Time Allocation Scheme with QoS Constraints in Overlay Multi-user Cognitive Radio Networks

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Abstract

This paper studies the case of an overlay cognitive radio network where the primary user leases spectral resources to the secondary user in exchange for cooperation, considering that both type of users have specific quality of service requirements. We investigate the problem of joint power and time allocation for the secondary access during the cooperative phase, with a view to optimizing the effective capacity of the primary user given an average energy constraint for the secondary user. Afterwards, the optimal power allocation of the secondary user for its own transmission phase is investigated in order to maximize the effective capacity of the secondary link. The proposed joint power and time allocation mechanism is compared with an optimal time/constant power allocation scheme and a less sophisticated baseline allocation scheme, i.e. power allocation under constant time and its superiority is proven for various network parameters. The reference model of one primary–one secondary user is extended to a general multi user cognitive radio network through the proposed pairing mechanism based on matching theory. Particularly, considering the remarks of the reference scenario, we propose two different matching schemes (with/without consideration of primary users’ quality of service requirements) and we confirm their superiority compared to other matching mechanisms.

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Authors and Affiliations

  1. School of Electrical and Computer Engineering, National Technical University of Athens, Iroon Polytexneiou 9, Athens, Greece

    Anargyros J. Roumeliotis, Stavroula Vassaki & Athanasios D. Panagopoulos

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  1. Anargyros J. Roumeliotis
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  2. Stavroula Vassaki
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  3. Athanasios D. Panagopoulos
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Correspondence to Athanasios D. Panagopoulos.

Appendix: Matching Algorithm for Multi-user CRNs

Appendix: Matching Algorithm for Multi-user CRNs

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Roumeliotis, A.J., Vassaki, S. & Panagopoulos, A.D. Joint Power and Time Allocation Scheme with QoS Constraints in Overlay Multi-user Cognitive Radio Networks. Wireless Pers Commun 98, 337–362 (2018). https://doi.org/10.1007/s11277-017-4872-1

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