Capacity and power allocation for spectrum sharing in cognitive radio systems under unknown channel state information and imperfect spectrum sensing

Ahhmadfard, A.; Jamshidi, Ali; Biguesh, Mehrzad

doi:10.1049/iet-com.2011.0819

Cited by 6 publications

(6 citation statements)

References 12 publications

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“…In the underlay method, the interference tolerance is required all the time because of the parallel transmission of the PU and SU. Furthermore, the capacity of the SUs in the underlay mode increases as the ITL increases . This restriction is not imposed in the overlay method since the SUs can transmit their data with the maximum available power.…”

Section: Overlay Vs Underlay Methodsmentioning

confidence: 99%

“…It is not unexpected because as it increases, there will be less spectrum opportunity available for the SUs for data transmission, leading to reduced performance of the overlay method. Furthermore, when the primary network's spectrum access probability decreases, the overlay method may outperform the underlay one …”

Section: Overlay Vs Underlay Methodsmentioning

confidence: 99%

“…Furthermore, the capacity of the SUs in the underlay mode increases as the ITL increases. 17 This restriction is not imposed in the overlay method since the SUs can transmit their data with the maximum available power. In Senthuran et al, 19 the interference threshold constraint (⋎ s ) at the primary receiver is obtained as…”

Section: Interference Tolerancementioning

confidence: 99%

“…Furthermore, when the primary network's spectrum access probability decreases, the overlay method may outperform the underlay one. 17…”

Section: Primary Network's Spectrum Access Probabilitymentioning

confidence: 99%

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A survey of overlay and underlay paradigms in cognitive radio networks

Kumar

Dhurandher

Woungang

2017

Int J Communication

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Summary In the recent years, wireless applications and services have grown tremendously, resulting to a shortage of radio spectrum. On one hand, most of the available radio spectrum has already been allocated to different users and service providers. On another hand, research and statistics have revealed that the spectrum utilization usability is very limited. To address this dilemma, the concept of cognitive radio has emerged, which promotes the use of overlay and underlay transmission techniques to boost the utilization of radio spectrum resources. This paper provides a comprehensive survey of these 2 techniques and compares them qualitatively based on several network parameters. Next, this paper simulates overlay and underlay transmission techniques in OMNeT++ simulator on different network parameters, namely, Primary user arrival rate, throughput, sensing duration, and energy consumption. Our findings reveal that neither the overlay nor the underlay technique is sufficient itself to fulfill the demands for future wireless systems, and adopting a hybrid access technique consisting of a joint utilization of overlay and underlay approaches is desirable. Furthermore, the key challenges and open research issues in radio spectrum resources utilization are discussed.

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Section: Overlay Vs Underlay Methodsmentioning

confidence: 99%

Section: Overlay Vs Underlay Methodsmentioning

confidence: 99%

Section: Interference Tolerancementioning

confidence: 99%

“…Furthermore, when the primary network's spectrum access probability decreases, the overlay method may outperform the underlay one. 17…”

Section: Primary Network's Spectrum Access Probabilitymentioning

confidence: 99%

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A survey of overlay and underlay paradigms in cognitive radio networks

Kumar

Dhurandher

Woungang

2017

Int J Communication

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“…In cooperative spectrum sensing, the number of cognitive users is related with the sensing performance [34,35]. However, plenty of participant SUs will not only lead to higher computational complexity and system overhead, but also make more detected values of cooperative users lie between the fuzzy regions in conventional dual threshold method at low SNR.…”

Section: Determination Of K Optmentioning

confidence: 99%

Dynamic dual threshold cooperative spectrum sensing for cognitive radio under noise power uncertainty

Wan

Ding

Xiong

et al. 2019

Hum. Cent. Comput. Inf. Sci.

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The rapid development of wireless communications has brought endless new types of services or applications for human beings. The emergence of many kinds of communication equipments makes the public frequency band more and more crowded [1]. At present, most of the wireless communication systems employ fixed spectrum allocation mechanism. Only authorized users can be allowed to access the corresponding authorized spectrum resources, which will lead to inefficient usage of the licensed spectrum. From the report issued by International Telecommunication Union (ITU), there are still plenty of free spectrum resources within certain authorized bands at specific temporal and spatial scenarios. In cognitive radio (CR) system, by dynamically adjusting transmission power, carrier frequency, modulation and other parameters, SUs can utilize the spectrum holes as well as avoid interference with primary users (PUs). By applying cognitive radio technology, the SUs can fully access free authorized bands and apply suitable

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