Searched for: subject%3A%22cognitive%255C%2Bradio%22
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den Boer, Hans (author)
Recently, interest in the use of deep learning technology for RF applications has increased. However, many of these studies are focused on developing deep learning models for a particular RF application. Therefore this master thesis focuses on the implementation of these kinds of deep learning models by using FPGAs such that these deep learning...
master thesis 2021
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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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Pan, N. (author)
Energy-harvesting cognitive radio network has emerged as a solution to increase energy and spectrum efficiency. In this thesis, we propose short-term offline optimal power allocation algorithms for multi-user energy-harvesting cognitive radio networks considering interference between secondary users. Assuming finite and rechargeable batteries...
master 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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Kalyanasundaram, P. (author)
Wireless Body Area Network (WBAN) is used for communication among sensor nodes operating on, in or around the human body in order to monitor vital body parameters and movements. A typical sensor node in WBAN should ensure accurate sensing of the signal from the body, carry out low-level processing of the sensor signal, and wirelessly transmit...
master thesis 2012
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Tessema, N.M. (author)
The wide deployment of wireless sensor nodes for varieties of applications calls the need for distributed beamforming as a cooperative scheme to efficiently use spectrum, to improve communication range and to save precious battery power during transmission. Given that there are a large set of cooperative cognitive radio users, ensuring the...
master thesis 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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Rao, V.S. (author)
Cognitive Radios (CRs) address the problems of spectrum scarcity and under-utilization of the spectrum. However, realizing a CR network is neither easy nor straight-forward. The link layer in CR Ad hoc Networks is responsible for allocating suitable channels, out of the currently available channels. It is also responsible for setting up...
master 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
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Abdulrahman, H. (author)
The demand for high data rates in wireless communication systems is increasing as well the demand for new (communication) services. Expanding of existing services or introducing new services needs a portion in the radio spectrum. Mean while the radio spectrum is a scarce resource and is regulated by governmental regulations and policies....
master thesis 2009
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Lamelas Polo, Y. (author)
It has been widely recognized that utilization of radio spectrum by licensed wireless systems, e.g., TV broadcasting, aeronautical telemetry, is quite low. In particular, at any given time and spatial region, there are frequency bands where there is no signal occupancy. There has been recent interest in improving spectrum utilization by...
master thesis 2008
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