An efficient hybrid spectrum access algorithm in OFDM-based wideband cognitive radio networks

In cognitive radio networks, wideband spectrum sensing is a promising technology which allows a secondary user (SU) to detect the signals of primary users (PUs) over multiple channels, the sensing overhead is reduced effectively. Together with spectrum sensing, spectrum access strategy affects the s...

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Vydáno v:Neurocomputing (Amsterdam) Ročník 125; s. 33 - 40
Hlavní autoři: Yang, Chao, Fu, Yuli, Zhang, Yan, Yu, Rong, Liu, Yi
Médium: Journal Article Konferenční příspěvek
Jazyk:angličtina
Vydáno: Amsterdam Elsevier B.V 11.02.2014
Elsevier
Témata:
Algorithmics. Computability. Computer arithmetics
Algorithms
Applied sciences
Channels
Coding, codes
Cognitive radio
Cognitive radio networks
Computer science; control theory; systems
Detection
Equipments and installations
Exact sciences and technology
Hybrid access strategy
Information, signal and communications theory
Mobile radiocommunication systems
Networks
Optimization
Orthogonal Frequency Division Multiplexing
Radiocommunications
Selection
Signal and communications theory
Strategy
Telecommunications
Telecommunications and information theory
Theoretical computing
Throughput maximization
Transmitters. Receivers
Wideband
Wideband spectrum sensing
Throughput maximization
Hybrid access strategy
Cognitive radio networks
Wideband spectrum sensing
Selection
Performance evaluation
Ergodic theory
Cellular radio
Frequency division multiple access
Frequency allocation
Ergodicity
Computational complexity
Modeling
Spectral analysis
Hybrid system
Dynamic allocation
Wide band
Channel estimation
Orthogonal frequency division multiplexing
Wireless network
Transmission rate
Multiple channel
Mathematical programming
Software radio
ISSN:0925-2312, 1872-8286
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Shrnutí:In cognitive radio networks, wideband spectrum sensing is a promising technology which allows a secondary user (SU) to detect the signals of primary users (PUs) over multiple channels, the sensing overhead is reduced effectively. Together with spectrum sensing, spectrum access strategy affects the system performance. In this paper, we propose an efficient hybrid access algorithm in OFDM-based wideband uplink model. An SU senses multiple channels via wideband spectrum sensing, and accesses these channels via a hybrid access strategy. The sensing time and transmission power of each channel are jointly optimized, in order to maximize the ergodic throughput of SUs, while the interferences to PUs are under the predefined thresholds. It is shown that the optimization problem can be formulated as a convex problem. Moreover, in order to reduce the computational complexity, two low complexity spectrum sensing and access schemes are proposed, in which the SU selects several specific channels to sense, and accesses all channels via a modified hybrid access strategy. For sensing channels selection, we present an effective selection criterion and an optimal selection order. Simulation results show that the proposed algorithm can effectively improve the system performance.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0925-2312
1872-8286
DOI:10.1016/j.neucom.2012.07.041