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1
Content available Time-slot based architecture for power beam-assisted relay techniques in CR-WSNs with transceiver hardware inadequacies
Umer Mushtaq Muhammad, Jiang Hong, Zhang Qiuyun, Manlu Liu, Muhammad Owais
Bulletin of the Polish Academy of Sciences. Technical Sciences
|
2023
|
Vol. 71, nr 5
art. no. e146620
EN
Over the past two decades, numerous research projects have concentrated on cognitive radio wireless sensor networks (CR-WSNs) and their benefits. To tackle the problem of energy and spectrum shortfall in CR-WSNs, this research proposes an underpinning decode-&-forward (DF) relaying technique. Using the suggested time-slot architecture (TSA), this technique harvests energy from a multi-antenna power beam (PB) and delivers source information to the target utilizing energy-constrained secondary source and relay nodes. The study considers three proposed relay selection schemes: enhanced hybrid partial relay selection (E-HPRS), conventional opportunistic relay selection (C-ORS), and leading opportunistic relay selection (L-ORS). We present evidence for the sustainability of the suggested methods by examining the outage probability (OP) and throughput (TPT) under multiple primary users (PUs). These systems leverage time switching (TS) receiver design to increase end-to-end performance while taking into account the maximum interference constraint and transceiver hardware inadequacies. In order to assess the efficacy of the proposed methods, we derive the exact and asymptotic closed-form equations for OP and TPT & develop an understanding to learn how they affect the overall performance all across the Rayleigh fading channel. The results show that OP of the L-ORS protocol is 16% better than C-ORS and 75% better than E-HPRS in terms of transmitting SNR. The OP of L-ORS is 30% better than C-ORS and 55% better than E-HPRS in terms of hardware inadequacies at the destination. The L-ORS technique outperforms C-ORS and E-HPRS in terms of TPT by 4% and 11%, respectively.
2
Content available remote Study and analysis of a novel compact cubic antenna design for WSN applications
Gahgouh Salem, Raggad Hedi, Saidi Imen, Gharsallah Ali
Przegląd Elektrotechniczny
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2022
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R. 98, nr 6
164--167
EN
This paper presents a novel miniaturized 3-D cubic antenna to be used for wireless sensor network (WSN) applications. The geometry of this antenna is designed as a cube including a meander dipole antenna. A truly omnidirectional pattern is produced by this antenna in both E-plane and H-plane, which allows for non-intermittent communication that is orientation independent. The operating frequency lies in the ISM band (centred in 2.45 GHz). The cubic shape of the antenna allows for smart packaging, as sensor equipment may be easily integrated into the hallow cube interior. All results of the simulations were performed by CST Microwave Studio simulation software and validated with HFSS.
PL
W artykule przedstawiono nowatorską, miniaturową antenę sześcienną 3D do zastosowania w bezprzewodowej sieci czujników (WSN). Geometria tej anteny jest zaprojektowana jako sześcian zawierający meandrową antenę dipolową. Ta antena wytwarza prawdziwie dookólny wzór zarówno w płaszczyźnie E, jak i H, co pozwala na nieprzerwaną komunikację, która jest niezależna od orientacji. Częstotliwość pracy leży w paśmie ISM (scentrowanym w 2,45 GHz). Sześcienny kształt anteny pozwala na sprytne pakowanie, ponieważ wyposażenie czujnika można łatwo zintegrować z wnętrzem sześcianu. Wszystkie wyniki symulacji zostały przeprowadzone przez oprogramowanie symulacyjne CST Microwave Studio i zweryfikowane za pomocą HFSS.
3
Content available Telematics in the technical condition monitoring of concrete dams structures using wireless sensor networks
Keosysano S., Szpytko J.
Archives of Transport System Telematics
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2019
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Vol. 12, iss. 1
22--28
EN
The safety of concrete dams, such as gravity dams, buttress dams, and arch dams, is directly related to not only its social and economic benefits, but also the personal and property safety of residents around the reservoir area. Therefore, it is of great importance to monitor the health of concrete dams using the obtained real-time information. In this paper, reviewed using an automatic wireless sensor monitoring system for temperature and humidity monitoring within concrete structures and A Real-Time Temperature Data Transmission Approach for Intelligent Cooling Control of Mass Concrete by using temperature sensors in arch dam. Structural Health Monitoring (SHM) aims to develop automated systems for the continuous monitoring, inspection, and damage detection of structures with minimum labour involvement.
4
Content available remote A randomization of parameters in Wireless Sensor Networks
Rajba S., Rajba T.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 9
240-244
EN
In this paper we present a model of single-hop type wireless sensor networks with random access and one-way transmission. We replace deterministic network parameters by random variables. This applies to parameters such as: the total number of nodes, the number of groups, the nodes percentage in each group, the average time between transmissions of each node in subsequent groups. We obtain formulas for the collision probability for different cases. The purpose of this approach is to match better the network model with random access to exact applications.
PL
W pracy przedstawiono model bezprzewodowej sieci czujników z losowym dostępem typu single-hop z jednokierunkową transmisją. Zastąpiono deterministyczne parametry sieci zmiennymi losowymi. Dotyczy to takich parametrów jak: całkowita liczba węzłów, liczba grup węzłów, udział procentowy węzłów w poszczególnych grupach, średnie czasy pomiędzy transmisjami węzłów w grupach. Otrzymano wzory na prawdopodobieństwo kolizji dla różnych przypadków. Celem jest lepsze dopasowanie modelu sieci z losowym dostępem do konkretnych aplikacji.
5
Content available remote A new study regarding the comparison of calculated and measured RSSI values under different experimental conditions
Malajner M., Benkic K., Planinsic P.
Przegląd Elektrotechniczny
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2013
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R. 89, nr 11
214-219
EN
This paper presents a new detailed study of comparison measured Received Signal Strength Indicator (RSSI) values, with the values being calculated by two electromagnetic (EM) wave propagation models, log-normal, and two ray ground-reflection models, respectively. Different experimental conditions were considered. We used different numbers of transmitting and receiving antennas, antennas geometrical placement and orientations-polarizations. This study was performed for long-range and short-range measurements inside and outside buildings.
PL
W artykule porównano metody pomiaru współczynnika RSSI (wskaźnik siły otrzymanego sygnału) dla dwóch modeli propagacji fali elektromagnetycznej. Stosowane różne warunki – różną liczbę anten, różne położenie anten i różne polaryzacje.
6
Content available remote The probability of collisions in Wireless Sensor Network with random sending
Rajba S., Rajba T.
Przegląd Elektrotechniczny
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2012
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R. 88, nr 9a
243-246
EN
The goal of this work is to define and to test the assumptions for the accomplishment of a wireless sensor network (WSN ) as a collective network (many-to-one) with random transmitting time of of sensor-senders to WSN (Wireless Sensor Network) receiving base. Innovativeness of this work lies in the concept of WSN network with random time of one-way transmission using one single radio frequency. Using PASTA system (Poisson Arrivals See Time Averages) for modeling WSN network, probability of transmission collision occurrence has been determined.
PL
Celem pracy jest zdefiniowanie i zbadanie założeń realizacji bezprzewodowej sieci czujników w systemie simpleksowej transmisji na jednej częstotliwości radiowej, jako sieci zbiorczej z losowym czasem nadawania czujników-nadajników do stacji odbiorczej (Wireless Sensor Network - WSN). Wykorzystując strumień zgłoszeń Poissona do modelowania sieci zbiorczej WSN, wyznaczamy prawdopodobieństwo występowania kolizji w transmisji.
7
Content available remote Position-based Wireless Sensor Network Routing Protocol for Strip Area
Qiao G., Zeng J.
Przegląd Elektrotechniczny
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2012
|
R. 88, nr 9b
188-191
EN
Limited by the terrain, lots of Wireless sensor network (WSN) applications have to be deployed in a narrow strip area. Due to the narrow and strip network structure, traditional WSN routing algorithms such as LEACH and PEGASIS can not be applied in such applications directly, it’s very necessary to develop a new routing protocol suit for the strip WSN. In order to improving communication efficiency of the strip network and saving the energy of the nodes, in this paper a Position-based Cluster routing (PBCR) protocol is proposed, which combines the clustering techniques with the chain routing techniques. The PBCR protocol divided the strip WSN into many belt-shaped region clusters and elected the cluster head through the position and dump energy of the nodes in the cluster, and forward data by cluster head chain. Simulation results show that the PBCR protocol can ensure a balanced use of node energy and prolong lifetime of the network, and has the obviously advantages in the narrow strip area than the LEACH and PEGASIS protocol.
PL
Przy wąskich pasku przestrzeni tradycyjne metody routing bezprzewodowej sieci czujników takie jak LEACH czy PEGASIS nie zdają egzaminu. W artykule zaproponowano nowy protokół PBCR – position based wireless network routing który łącz w sobie technikę klastrów i technikę łańcucha routingu.
8
Content available remote An Application of Canonical Decomposition to TDOA Estimation for 3D Wireless Sensor Network Node Localization
Jiang H., Liu C., Sun X.
Przegląd Elektrotechniczny
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2012
|
R. 88, nr 9b
92-95
EN
In this paper, a time difference of arrival (TDOA) estimation algorithm is proposed by extending canonical correlation decomposition (CCD) to measure multipath delays for determining node positions in Ultra-wideband wireless sensor networks (WSNs). Multilateral localization based on 3D Chan algorithm is employed to solve the non-linear problems for performance improvement. The method can perform well in the environment with unknown noise. The effectiveness is validated by simulations and the effects of noise and the number of anchor nodes are analyzed.
PL
Przedstawiono algorytm TDOA (time difference of arrival) do określania wielościeżkowych opóźnień w szerokopasmowej bezprzewodowej sieci czujników. Metoda jest przydatna w środowisku o nieznanych szumach.
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