Outage Performance Analysis of NOMA in Wireless Powered Cognitive Radio Networks with AF and DF Relaying Techniques

Improving spectral efficiency under a certain energy limitation is an important design metric for future wireless communications as a response to the growing transmission demand of wireless devices. In order to improve spectral efficiency for communication systems without increasing energy consumpti...

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Autores principales:	Hui Wang, Jian Dong, Kun Tang, Heyuan Shi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	relay-assisted NOMA cognitive radio network energy harvesting amplified-and-forward relaying decoded-and-forward relaying Science Q Astrophysics QB460-466 Physics QC1-999
Acceso en línea:	https://doaj.org/article/6212e1e72a694c8ab354fd4096015e49
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spelling	oai:doaj.org-article:6212e1e72a694c8ab354fd4096015e492021-11-25T17:29:51ZOutage Performance Analysis of NOMA in Wireless Powered Cognitive Radio Networks with AF and DF Relaying Techniques10.3390/e231114631099-4300https://doaj.org/article/6212e1e72a694c8ab354fd4096015e492021-11-01T00:00:00Zhttps://www.mdpi.com/1099-4300/23/11/1463https://doaj.org/toc/1099-4300Improving spectral efficiency under a certain energy limitation is an important design metric for future wireless communications as a response to the growing transmission demand of wireless devices. In order to improve spectral efficiency for communication systems without increasing energy consumption, this paper considers a non-orthogonal multiple access (NOMA)–based cognitive radio network, with the assistance of a wireless-powered relay station (RS), and then analyzes the system outage performance under amplified-and-forward (AF) and decoded-and-forward (DF) cooperative transmission modes. Specifically, the base station (BS) has the opportunity to cooperate by transmitting information through the RS, depending on whether the RS can harvest sufficient RF energy for cooperative transmission. That is to say, when the energy stored by the RS is sufficient for cooperative transmission, the RS will assist the BS to forward information; otherwise, the BS will send information through direct links, while the RS converts the radio frequency (RF) signals sent by the BS into energy for future transmission. Moreover, the transmission power required by the RS for cooperative transmission is usually relatively large, while the amount of harvested energy by the RS in a transmission slot is usually low, so it takes several consecutive time slots to accumulate enough transmission energy. To this end, we utilize a discrete-time Markov chain to describe the processes of charging and discharging of the RS. Subsequently, we derive the closed-form outage probabilities of both the primary and secondary systems for the considered system in AF and DF modes through mathematical analysis, and verify the accuracy of the analyses through Monte Carlo simulation. The simulation results show that the two proposed cooperative transmission schemes with AF and DF relaying techniques outperform both direct transmission and other similar schemes in both the primary and secondary system, while the DF scheme can provide better performance than the AF scheme within the range of setting values.Hui WangJian DongKun TangHeyuan ShiMDPI AGarticlerelay-assisted NOMAcognitive radio networkenergy harvestingamplified-and-forward relayingdecoded-and-forward relayingScienceQAstrophysicsQB460-466PhysicsQC1-999ENEntropy, Vol 23, Iss 1463, p 1463 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	relay-assisted NOMA cognitive radio network energy harvesting amplified-and-forward relaying decoded-and-forward relaying Science Q Astrophysics QB460-466 Physics QC1-999
spellingShingle	relay-assisted NOMA cognitive radio network energy harvesting amplified-and-forward relaying decoded-and-forward relaying Science Q Astrophysics QB460-466 Physics QC1-999 Hui Wang Jian Dong Kun Tang Heyuan Shi Outage Performance Analysis of NOMA in Wireless Powered Cognitive Radio Networks with AF and DF Relaying Techniques
description	Improving spectral efficiency under a certain energy limitation is an important design metric for future wireless communications as a response to the growing transmission demand of wireless devices. In order to improve spectral efficiency for communication systems without increasing energy consumption, this paper considers a non-orthogonal multiple access (NOMA)–based cognitive radio network, with the assistance of a wireless-powered relay station (RS), and then analyzes the system outage performance under amplified-and-forward (AF) and decoded-and-forward (DF) cooperative transmission modes. Specifically, the base station (BS) has the opportunity to cooperate by transmitting information through the RS, depending on whether the RS can harvest sufficient RF energy for cooperative transmission. That is to say, when the energy stored by the RS is sufficient for cooperative transmission, the RS will assist the BS to forward information; otherwise, the BS will send information through direct links, while the RS converts the radio frequency (RF) signals sent by the BS into energy for future transmission. Moreover, the transmission power required by the RS for cooperative transmission is usually relatively large, while the amount of harvested energy by the RS in a transmission slot is usually low, so it takes several consecutive time slots to accumulate enough transmission energy. To this end, we utilize a discrete-time Markov chain to describe the processes of charging and discharging of the RS. Subsequently, we derive the closed-form outage probabilities of both the primary and secondary systems for the considered system in AF and DF modes through mathematical analysis, and verify the accuracy of the analyses through Monte Carlo simulation. The simulation results show that the two proposed cooperative transmission schemes with AF and DF relaying techniques outperform both direct transmission and other similar schemes in both the primary and secondary system, while the DF scheme can provide better performance than the AF scheme within the range of setting values.
format	article
author	Hui Wang Jian Dong Kun Tang Heyuan Shi
author_facet	Hui Wang Jian Dong Kun Tang Heyuan Shi
author_sort	Hui Wang
title	Outage Performance Analysis of NOMA in Wireless Powered Cognitive Radio Networks with AF and DF Relaying Techniques
title_short	Outage Performance Analysis of NOMA in Wireless Powered Cognitive Radio Networks with AF and DF Relaying Techniques
title_full	Outage Performance Analysis of NOMA in Wireless Powered Cognitive Radio Networks with AF and DF Relaying Techniques
title_fullStr	Outage Performance Analysis of NOMA in Wireless Powered Cognitive Radio Networks with AF and DF Relaying Techniques
title_full_unstemmed	Outage Performance Analysis of NOMA in Wireless Powered Cognitive Radio Networks with AF and DF Relaying Techniques
title_sort	outage performance analysis of noma in wireless powered cognitive radio networks with af and df relaying techniques
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/6212e1e72a694c8ab354fd4096015e49
work_keys_str_mv	AT huiwang outageperformanceanalysisofnomainwirelesspoweredcognitiveradionetworkswithafanddfrelayingtechniques AT jiandong outageperformanceanalysisofnomainwirelesspoweredcognitiveradionetworkswithafanddfrelayingtechniques AT kuntang outageperformanceanalysisofnomainwirelesspoweredcognitiveradionetworkswithafanddfrelayingtechniques AT heyuanshi outageperformanceanalysisofnomainwirelesspoweredcognitiveradionetworkswithafanddfrelayingtechniques
_version_	1718412288403177472

Outage Performance Analysis of NOMA in Wireless Powered Cognitive Radio Networks with AF and DF Relaying Techniques

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