Searched for: subject%3A%22cognitive%255C+radio%22
(1 - 13 of 13)
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Kazaz, T. (author), Janssen, G.J.M. (author), van der Veen, A.J. (author)
The multipath radio channel is considered to have a non-bandlimited channel impulse response. Therefore, it is challenging to achieve high resolution time-delay (TD) estimation of multipath components (MPCs) from bandlimited observations of communication signals. It this paper, we consider the problem of multiband channel sampling and TD...
conference paper 2020
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Stein, M.S. (author), Fauß, Micheal (author)
We consider the problem of making a quick decision in favor of one of two possible physical signal models while the numerical measurements are acquired by sensing devices featuring minimal digitization complexity. Therefore, the digital data streams available for statistical processing are binary and exhibit temporal and spatial dependencies....
journal article 2019
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Kazaz, T. (author), Rajan, R.T. (author), Janssen, G.J.M. (author), van der Veen, A.J. (author)
Achieving high resolution time-of-arrival (TOA) estimation in multipath propagation scenarios from bandlimited observations of communication signals is challenging because the multipath channel impulse response (CIR) is not bandlimited. Modeling the CIR as a sparse sequence of Diracs, TOA estimation becomes a problem of parametric spectral...
conference paper 2019
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Sarijari, M.A.B. (author), Abdullah, M.S. (author), Janssen, G.J.M. (author), Van der Veen, A.J. (author)
The growing number of wireless devices for in-house use is causing a more intense use of the spectrum to satisfy the required quality-of-service such as throughput. This has contributed to spectrum scarcity and interference problems particularly in home area networks (HAN). Cognitive radio (CR) has been recognized as one of the most important...
journal article 2015
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Shi, H. (author)
With the rapid development in wireless devices, applications and networks, radio frequencies have become scarce resources. Therefore, it is critical to make efficient use of the radio frequencies. A promising way to solve this problem is the use of cognitive radio (CR). In CR, radio frequencies are allocated to licensed users, also called...
doctoral thesis 2014
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Anker, P.D.C. (author)
This paper is intended to contribute to the debate on the best way forward in governance of the radio spectrum. The traditional spectrum management regime has shown a number of weaknesses: Some of the portions of the spectrum are hardly used, when considered in time and place, and the regime is slow in responding to changes in the market and to...
conference paper 2013
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Maleki, S. (author)
Dynamic spectrum access employing cognitive radios has been proposed, in order to opportunistically use underutilized spectrum portions of a heavily licensed electromagnetic spectrum. Cognitive radios opportunistically share the spectrum, while avoiding any harmful interference to the primary licensed users. One major category of cognitive...
doctoral thesis 2013
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Lian, X. (author)
Cognitive Radio (CR) is an energy efficient technique that is capable of optimizing the premium radio resources, such as power and spectrum. In this thesis, we focus on exploiting spatial diversity for CR. We have adopted two spatial signal processing techniques, i.e., Adaptive Beamforming (ABF) and Distributed Beamforming (DB) for CR users and...
doctoral thesis 2013
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Anker, P.D.C. (author), Lemstra, W. (author)
This paper proposes to use the perspective of the business case to deal with the alignment between the introduction of new technology and the regulatory environment. Although this perspective can be used more generally this paper deals with this perspective in the context of the alignment between the introduction of Cognitive Radio technology...
conference paper 2012
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Lian, X. (author), Nikookar, H. (author), Ligthart, L.P. (author)
Cognitive radio (CR) is an intelligent radio system and is able to share the spectrum with licensed users (LU). By adopting adaptive beam forming techniques, CR can reuse the spectrum with LU via directing main beams towards CR users while displaying nulls towards LU. In this article, we present a new distributed beam forming (DB) technique, and...
journal article 2012
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Budiarjo, I. (author)
Cognitive Radio is a new paradigm in the wireless communications. It puts the intelligence and awareness dimension to the radio communication system. A Cognitive Radio system will be aware of the changing condition in its environment. The awareness in this thesis is related to the spectrum and the channel stipulation. By intelligent learning and...
doctoral thesis 2009
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Doerr, C. (author), Grunwald, D. (author), Sicker, D.C. (author)
In a network deployment, a cognitive radio will have to perform two fundamental tasks. First, each cognitive radio needs to optimize its internal operation, and second, it needs to derive a configuration that will enable and optimize communication with other nodes in the network. This latter requirement, however, relies on knowledge about the...
journal article 2009
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Pawelczak, P. (author)
doctoral thesis 2009
Searched for: subject%3A%22cognitive%255C+radio%22
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