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Ing. Alexandru Moucha, Ph.D.

Publikace

Optimization of Distributed Phase Shift Beamforming Configuration by using Convex Hull

Autoři
Černý, V.; Moucha, A.; Kubr, J.
Rok
2020
Publikováno
2020 10th International Conference on Advanced Computer Information Technologies, ACIT 2020 - Proceedings. IEEE Xplore, 2020. p. 273-277. vol. 10. ISBN 978-1-7281-6760-2.
Typ
Stať ve sborníku
Anotace
This article deals with a problem of disconnected wireless sensor networks. Our team investigates a usage of distributed or collaborative beamforming for creation of new long-distance connections between loose network clusters. We focus on decreasing the complexity of searching for network modules which are suitable for creation of inter-cluster connection using distributed/collaborative beamforming techniques.

Application of neural networks for decision making and evaluation of trust in ad-hoc networks

Rok
2017
Publikováno
13th International Wireless Communications and Mobile Computing Conference(IWCMC). IEEE, 2017. p. 371-377. ISBN 978-1-5090-4372-9.
Typ
Stať ve sborníku
Anotace
In this paper, we demonstrate that neural networks (NNs) are capable of trust estimation and evaluation in ad-hoc networks. The concept of trust in distributed systems arose from the notion of social trust. By the trust problem, we understand the problem of measuring the confidence in the fact that individual nodes behave correctly. We model trust in ad-hoc networks using the packet delivery ratio (PDR) metric. We have developed a method to apply NNs for solving the trust problem in ad-hoc networks. We have conducted a series of simulation experiments and measured the quality of our new method. The results show in average 98% accuracy of the classification and 94% of the regression problem. An important contribution of our research is a verification of the hypothesis that synthetic generation of ad-hoc network traffic in a simulator is sufficient for training of a NN that is then capable to accurately estimate trust in an ad-hoc network.

Distributed phase-shift beamforming power balancing in ad-hoc and sensor networks

Autoři
Rok
2014
Publikováno
Telecommunication Systems. 2014, 57(4), 367-377. ISSN 1018-4864.
Typ
Článek
Anotace
Ad-hoc and sensor networks are a well-studied area which gained a lot of attention in the research in the last decades. Two of the problems of battery-powered radio devices are limited transmitter power and finite amount of energy. This paper continues the path opened by the development of a new technology for radio communication which allows cluster communication beyond the horizon of each individual transmitter and the distribution of power need among the modules forming a cluster. This in terms decreases the average power need per device and contributes to a longer lifetime of the entire network.

Interference Cancellation by the Usage of Distributed Phase Shift Beamforming

Autoři
Černý, V.; Moucha, A.; Kubr, J.
Rok
2014
Publikováno
2014 Eighth International Conference on Next Generation Mobile Applications, Services and Technologies. Los Alamitos: Conference publishing Services, 2014. p. 248-253. ISBN 978-1-4799-5073-7.
Typ
Stať ve sborníku
Anotace
There are many ways to deal with interference in wireless networks: topology control, scheduling, channel surfing, etc. All try to prevent interference from taking place (by allocating transmissions to different frequencies, to different time slots, etc). The novelty of the proposed approach in this paper is inspired from the way today headphones use noise cancellation – our approach is to use adjacent modules to one transmitter to cancel the signals of that transmitter to desired areas and thus to decrease interference in the network.

Optimal algorithm for phase shift searching for the DPSBF

Autoři
Černý, V.; Moucha, A.; Kubr, J.
Rok
2014
Publikováno
Proceedings of the 2nd Prague Embedded Systems Workshop. 2014. p. 17-21.
Typ
Stať ve sborníku
Anotace
The distributed phase shift beamforming is the great technique for spatial signal filtering in wireless networks. We already showed that this technique can be exploited for the interference reduction in wireless networks. This paper deals with optimal phase shift search for this method.

Distributed phase-shift beamforming power balancing in ad-hoc and sensor networks

Autoři
Rok
2013
Publikováno
Telecommunication Systems. 2013, 2013 1-11. ISSN 1572-9451.
Typ
Článek
Anotace
Ad-hoc and sensor networks are a well-studied area which gained a lot of attention in the research in the last decades. Two of the problems of battery-powered radio devices are limited transmitter power and finite amount of energy. This paper continues the path opened by the development of a new technology for radio communication which allows cluster communication beyond the horizon of each individual transmitter and the distribution of power need among the modules forming a cluster. This in terms decreases the average power need per device and contributes to a longer lifetime of the entire network.

Cluster discovery in phase-shift beamformed ad-hoc and sensor networks

Rok
2011
Publikováno
Wireless Communications and Mobile Computing 2011. Piscataway: IEEE, 2011. pp. 1069-1074. ISBN 978-1-4244-9539-9.
Typ
Stať ve sborníku
Anotace
The area of interfering radio waves has been studied thoroughly when the antennas are powered by the same radio chip (smart antennas, MIMO, antenna arrays, etc.), however the science of achieving good results in a distributed manner (one antenna per device) and over multiple layers in the communication stack (e. g. routing tables based on radio wave interference) is still in its infancy. The work of the authors is exactly to explore this realm of phase-shift interfering waves and this paper brings into attention the possibility of cluster discovery that will proceed communication between two clusters through phase-shift distributed beamforming.