Joint versus separate spectrum sensing and resource allocation in OFDMA-based cognitive radio networks

In this study, the authors investigate the resource allocation issue for sensing-based orthogonal frequency-division multiple access (OFDMA) cognitive radio networks. They consider a network consisting multiple secondary users (SUs) and a secondary base station (BS) implementing a two-phase protocol...

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Veröffentlicht in:IET communications Jg. 10; H. 7; S. 839 - 847
Hauptverfasser: Janatian, Nafiseh, Modarres-Hashemi, Mahmood, Sun, Sumei
Format: Journal Article
Sprache:Englisch
Veröffentlicht: The Institution of Engineering and Technology 05.05.2016
Schlagworte:
bandwidth 1.25 MHz
bandwidth 2.5 MHz
bilevel optimisation problem
channel allocation
Cognitive radio
cognitive radio network
computational complexity
cooperative communication
Detection
Energy conservation
energy consumption
frequency division multiple access
joint optimisation method
Mathematical models
mixed binary integer programming problem
Networks
NP‐hard
OFDM modulation
OFDMA
optimisation
Optimization
orthogonal frequency division multiple access
protocols
quality of service
radio spectrum management
Resource allocation
secondary base station
secondary user
separate optimisation
signal detection
signal‐to‐noise ratio
soft cooperative spectrum sensing
SU sensing parameter
subchannel assignment
transmit power
two‐phase protocol
Uplinking
secondary base station
NP-hard
bilevel optimisation problem
optimisation
resource allocation
cognitive radio
bandwidth 1.25 MHz
mixed binary integer programming problem
bandwidth 2.5 MHz
joint optimisation method
OFDM modulation
OFDMA
subchannel assignment
protocols
channel allocation
energy consumption
transmit power
radio spectrum management
signal detection
frequency division multiple access
orthogonal frequency division multiple access
quality of service
separate optimisation
cooperative communication
soft cooperative spectrum sensing
secondary user
signal-to-noise ratio
SU sensing parameter
two-phase protocol
cognitive radio network
computational complexity
ISSN:1751-8628, 1751-8636
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Beschreibung
Zusammenfassung:In this study, the authors investigate the resource allocation issue for sensing-based orthogonal frequency-division multiple access (OFDMA) cognitive radio networks. They consider a network consisting multiple secondary users (SUs) and a secondary base station (BS) implementing a two-phase protocol. In the first phase, cooperative spectrum sensing is carried out to detect the vacant subchannels. In the second phase, SUs transmit data in the uplink to the BS by using OFDMA. They optimise the sensing parameters, transmit power and subchannel assignments jointly to minimise the total energy consumption with the constraints on SUs’ quality of service and detection probability of the primary user. This is a mixed binary integer programming problem which is NP (non-deterministic polynomial-time)-hard and generally intractable. They represent the problem as a bilevel problem and propose two efficient algorithms to solve the slave and master subproblems. They also study the separate optimisation, in which the sensing parameters of SUs are set regardless of the allocated resources. They investigate the energy savings of joint versus separate optimisation using numerical experiments. The results show that the joint optimisation method can introduce up to 16% of energy saving in zero sensing signal-to-noise ratio with the same total transmission bandwidth of 2.5 MHz.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1751-8628
1751-8636
DOI:10.1049/iet-com.2015.0912