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Primary Users and
"... Cognitive radios hold tremendous promise for increasing spectral efficiency in wireless systems. A cognitive radio as an intelligent wireless Communication device that exploits side information about its environment to ..."
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Cognitive radios hold tremendous promise for increasing spectral efficiency in wireless systems. A cognitive radio as an intelligent wireless Communication device that exploits side information about its environment to
Sequential Decoder at the Primary User
"... Interference-free spectrum sharing using a sequential decoder at the primary user This document has been downloaded from Chalmers Publication Library (CPL). It is the author´s version of a work that was accepted for publication in: ..."
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Interference-free spectrum sharing using a sequential decoder at the primary user This document has been downloaded from Chalmers Publication Library (CPL). It is the author´s version of a work that was accepted for publication in:
Coexistence with primary users of different scales
"... Abstract — Opportunistic radio systems aim to exploit ‘spectrum holes ’ by finding bands and transmission characteristics that will not cause harmful interference to the primary users of that band. This paper explores whether it is harder/easier to peacefully coexist with primary systems that operat ..."
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Cited by 21 (1 self)
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Abstract — Opportunistic radio systems aim to exploit ‘spectrum holes ’ by finding bands and transmission characteristics that will not cause harmful interference to the primary users of that band. This paper explores whether it is harder/easier to peacefully coexist with primary systems
Authentication of Primary User in Cognitive Radio
"... Cognitive Radio (CR) or soft ware defined radio is a new concept for maximizing the utilization of the radio spectrum. The CR can sense the unused frequency spectrum at any time from the wide range of wireless radio spectrum. This gives the efficient use of radio resources. In cognitive radio enviro ..."
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environment, a primary licensed user (PU) can share spectrum availability information with a secondary user, the secondary user will then be able to access available frequency spectrum. However, a secondary user should always need to verify the authenticity of the spectrum occupancy information whether
Implementation issues in spectrum sensing for cognitive radios
- in Proc. the 38th. Asilomar Conference on Signals, Systems, and Computers
, 2004
"... Abstract- There are new system implementation challenges involved in the design of cognitive radios, which have both the ability to sense the spectral environment and the flexibility to adapt transmission parameters to maximize system capacity while co-existing with legacy wireless networks. The cri ..."
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Cited by 440 (7 self)
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. The critical design problem is the need to process multi-gigahertz wide bandwidth and reliably detect presence of primary users. This places severe requirements on sensitivity, linearity, and dynamic range of the circuitry in the RF front-end. To improve radio sensitivity of the sensing function through
Primary Users in Cellular Networks: A Large-Scale . . .
"... Most existing studies of spectrum usage have been performed by actively sensing the energy levels in specific RF bands including cellular bands. In this paper, we provide a unique, complementary analysis of cellular primary usage by analyzing a dataset collected inside a cellular network operator. O ..."
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Cited by 57 (5 self)
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Most existing studies of spectrum usage have been performed by actively sensing the energy levels in specific RF bands including cellular bands. In this paper, we provide a unique, complementary analysis of cellular primary usage by analyzing a dataset collected inside a cellular network operator
Primary User Localization Schemes in Cooperative Sensing
"... In cognitive radio networks secondary users access licensed fre-quency bands if they are free to use. Since it is inevitable that trans-missions of the licensed users must not be interfered with different sensing and transmission techniques have to be utilized by the sec-ondary users. For example th ..."
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the knowledge of a primary user loca-tion can be exploited to reduce the interference with that particular user. Thereby applicable techniques are directed transmissions and transmission power control of the secondary users. However the localization is not trivial and is tainted with uncertainties due
Multiple Primary Users over Nakagami-m Fading
, 2013
"... The performance of cognitive spectrum sharing systems with opportunistic relay selection over Nakagami-m fading is analyzed in the presence of multiple primary users (PUs). In particular, we derive an exact closed-form expression for the outage probability (OP) of the considered cognitive relay syst ..."
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The performance of cognitive spectrum sharing systems with opportunistic relay selection over Nakagami-m fading is analyzed in the presence of multiple primary users (PUs). In particular, we derive an exact closed-form expression for the outage probability (OP) of the considered cognitive relay
Arb: A software environment for sequence data
- Nucleic Acids Res
, 2004
"... The ARB (from Latin arbor, tree) project was initiated almost 10 years ago. The ARB program package comprises a variety of directly interacting software tools for sequence database maintenance and analysis which are controlled by a common graphical user interface. Although it was initially designed ..."
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Cited by 421 (10 self)
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The ARB (from Latin arbor, tree) project was initiated almost 10 years ago. The ARB program package comprises a variety of directly interacting software tools for sequence database maintenance and analysis which are controlled by a common graphical user interface. Although it was initially designed
Results 1 - 10
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7,853
