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2008 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CrownCom 2008)

Date 15-17 May 2008

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  • Proceedings of the The Third International Conference on Cognitive Radio Oriented Wireless Networks and Communications

    Publication Year: 2008, Page(s): 1
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  • [Copyright notice]

    Publication Year: 2008, Page(s): 1
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  • CrownCom 2008 General Co-Chairs' Message

    Publication Year: 2008, Page(s): 1
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  • Steering Committee

    Publication Year: 2008, Page(s): 1
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  • Organizing Committee

    Publication Year: 2008, Page(s): 1
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  • Technical Program Committees

    Publication Year: 2008, Page(s):1 - 2
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  • Table of contents

    Publication Year: 2008, Page(s):1 - 8
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  • [Breaker page]

    Publication Year: 2008, Page(s): 1
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  • [Breaker page]

    Publication Year: 2008, Page(s): 1
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    Publication Year: 2008, Page(s): 1
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    Publication Year: 2008, Page(s): 1
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    Publication Year: 2008, Page(s): 1
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  • [Breaker page]

    Publication Year: 2008, Page(s): 1
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  • Blind Spectrum Sensing for Cognitive Radio Based on Model Selection

    Publication Year: 2008, Page(s):1 - 4
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1226 KB) | HTML iconHTML

    Cognitive radio devices will be able to seek and dynamically use frequency bands for network access. This will be done by autonomous detection of vacant sub-bands in the radio spectrum. In this paper, we propose a new method for blind detection of vacant sub-bands over the spectrum band. The proposed method exploits model selection tools like Akaike information criterion (AIC) and Akaike weights t... View full abstract»

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  • Parametric Density Estimation Using EM Algorithm for Collaborative Spectrum Sensing

    Publication Year: 2008, Page(s):1 - 6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (283 KB) | HTML iconHTML

    Collaborative sensing of spectral occupancy can increase accuracy and relax the required sensitivity of individual sensing units. Collaborative sensing requires knowledge about the densities of collected sensing statistics to form the correct decision statistics for the optimum likelihood ratio test. In this paper, a parametric density estimation scheme using the expectation-maximization (EM) algo... View full abstract»

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  • Sensing Optimization Considering Sensing Capability of Cognitive Terminal in Cognitive Radio System

    Publication Year: 2008, Page(s):1 - 6
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB) | HTML iconHTML

    Cognitive radio is a promising technology to over-come the insufficiency of available communication spectrums. In the cognitive radio system, many important issues exist. Spectrum sensing is one of the important issues, which has been studied throughout recently. In this paper, we propose a new distributed spectrum sensing scheme which considers the difference of sensing capabilities among cogniti... View full abstract»

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  • Double Threshold Energy Detection of Cooperative Spectrum Sensing in Cognitive Radio

    Publication Year: 2008, Page(s):1 - 5
    Cited by:  Papers (60)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (365 KB) | HTML iconHTML

    Cognitive radio has become an effective theory to solve the inefficiency of the spectrum usage, and cooperative spectrum sensing among the secondary users to detect the primary user accurately is broadly studied before. In this paper, we employ a double threshold method in energy detector to perform spectrum sensing, while a fusion center in the cognitive radio network collects the local decisions... View full abstract»

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  • Adaptive Sensing Threshold Control Based on Transmission Power in Cognitive Radio Systems

    Publication Year: 2008, Page(s):1 - 6
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (221 KB) | HTML iconHTML

    Spectrum sensing is a key enabling technology for cognitive radio. Since there is a tradeoff between the probability of missed detection and the probability of false alarm according to a value of sensing threshold, it is very important to determine the sensing threshold suitable for cognitive radio environments. In this paper, we propose a novel method to determine the sensing threshold in the cog... View full abstract»

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  • A Spread Signals Detection Algorithm based on the Second Order Statistics in Semi-Blind Contexts

    Publication Year: 2008, Page(s):1 - 4
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (774 KB) | HTML iconHTML

    In this contribution, we propose a spread signal detector based on the averaged-power of its autocorrelation function. A cost function that tests this property is build and some results are given on its estimation. We also explain how to use it to detect signals in SISO and SIMO cases. We conclude this paper with some numerical estimation of the proposed algorithm performances. View full abstract»

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  • [Breaker page]

    Publication Year: 2008, Page(s): 1
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  • Impact of Cognitive Radio on Future Management of Spectrum

    Publication Year: 2008, Page(s):1 - 6
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (667 KB) | HTML iconHTML

    Cognitive radio is a breakthrough technology which is expected to have a profound impact on the way radio spectrum will be accessed, managed and shared in the future. In this paper I examine some of the implications of cognitive radio for future management of spectrum. Both a near-term view involving the opportunistic spectrum access model and a longer-term view involving a self-regulating dynamic... View full abstract»

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  • Policy and Technology of Dynamic Spectrum Access in Korea

    Publication Year: 2008, Page(s):1 - 4
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (701 KB) | HTML iconHTML

    In this paper, we introduce spectrum policies and dynamic spectrum access technologies in Korea. In the past, Korea spectrum management was the command and control with exclusive usage rights and small portions of spectrum commons bands. With the development of the radio technologies, recently, Korea government, MIC (Ministry of Information and Communication), has been adopting new spectrum polici... View full abstract»

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  • Spectrum Survey in Singapore: Occupancy Measurements and Analyses

    Publication Year: 2008, Page(s):1 - 7
    Cited by:  Papers (147)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6106 KB) | HTML iconHTML

    We study the 24-hour spectrum usage pattern in Singapore in the frequency bands ranging from 80 MHz to 5850 MHz. The objectives are to find how the scarce radio spectrum allocated to different services is utilized in Singapore and identify the bands that could be accessed for future opportunistic use due to their low or no active utilization. The results from the spectrum measurements taken over 1... View full abstract»

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  • From Maxwell's Equations to Cognitive Radio

    Publication Year: 2008, Page(s):1 - 5
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (411 KB) | HTML iconHTML

    Maxwell's equations that were published around 1865 caused Heinrich Hertz to prove the existence of electromagnetic waves. He succeeded in 1887/88. Around 1900, Marconi established the first long distance radio communication connections. During the following five decades, analog radio communication was brought to perfection. A big change in radio development was launched by Shannon with the public... View full abstract»

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  • Making the Best out of Spectral Efficiency; Studies on The Introduction of Open-Spectrum Policy

    Publication Year: 2008, Page(s):1 - 4
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4467 KB) | HTML iconHTML

    Open spectrum policy mostly deals with the shared-use of spectrum resources which again utilizes the orthogonality in different spectral domains - geography, space, power, frequency and time. Among these, temporal share of the spectrum, known as CR or cognitive radio technology, allows secondary licensees to opportunistically access the spectrum during the absence of the first. This paper provides... View full abstract»

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