Design and analysis of adaptive full-duplex cognitive relay cooperative strategy based on primary system behavior
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Design and analysis of adaptive full-duplex cognitive relay cooperative strategy based on primary system behavior Suoping Li1
•
Wei Li1 • Jaafar Gaber2 • Kejun Jia3 • Fan Wang4
Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The core problem of cognitive radio networks is the accurate sensing and the efficient use of spectrum holes without interfering the communication of the primary system. This paper proposes a cooperative strategy with two full-duplex cognitive base stations (FDCBS) where in-band full-duplex technology and cognitive radio are integrated. If the primary channel is in the ‘‘busy’’ state, the FDCBS assist the primary system in the retransmission of the failed packet and receive the cognitive packets simultaneously. We derive the outage probability and the average spectral efficiency of the primary system and the cognitive system for two scenarios where the 2-state Discrete Markov Chain describes the primary system behaviour (2-SDMC) and a non-identically distributed Nakagami-m fading channel is assumed. We determine the average spectral efficiency of the cognitive system in the case of incomplete self-interference, and the lower bound of the outage probability of the cognitive system when the primary channel is in the ‘‘busy’’ state. Numerical results show that our proposed scheme achieves a better improvement on the efficiency of the cognitive system and the primary system simultaneously than the traditional Half-Duplex relay mode. Keywords Adaptive cooperative transmission Behavior of primary system Full-duplex cognitive base station Self-interference suppression capability Nakagami-m fading channel
1 Introduction
& Suoping Li [email protected] Wei Li [email protected] Jaafar Gaber [email protected] Kejun Jia [email protected] Fan Wang [email protected] 1
School of Science, Lanzhou University of Technology, Lanzhou 730050, China
2
Universite de Technologie Belfort-Montbeliard, 90010 Belfort, France
3
School of Computer and Communication, Lanzhou University of Technology, Lanzhou 730050, China
4
School of Electrical and Information Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Two most promising technologies are in-band full-duplex technology and cognitive radio to enhance the usage of spectrum resources. The core idea of cognitive radio is to exploit the dynamic spectrum sharing paradigm for spectrum utilization efficiency. Essentially, the concept of cognitive radio allows the transmission of secondary users in the licensed spectrum of the primary radio system without inferring the regular communication of the primary system [1, 2]. The secondary users monitor the licensed spectrum opportunistically send packets in the licensed channel when the primary users are inactive. However, an in-band full-duplex (FD) mode has been proposed to enhance throughputs for cognitive radio networks [3–6]. Theoretically, the transmit rate of the in-band FD can be a twice of the traditional Half-Duplex mode [3–6].
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