Most recent issue published online in the International Journal of Ultra Wideband Communications and Systems.
International Journal of Ultra Wideband Communications and Systems
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International Journal of Ultra Wideband Communications and Systems
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http://www.inderscience.com/browse/index.php?journalID=335&year=2022&vol=5&issue=3
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Preconditioning conjugate-gradient-based LAS detection for massive MIMO systems
http://www.inderscience.com/link.php?id=126774
In massive multiple-input multiple-output (MIMO) wireless systems, the computational load of data detection increases along with the increasing number of antennas. The neighbourhood search algorithms achieve near-optimal performance and these are derived from an inversion of large-dimensional matrices. Recently, linear iterative solvers, such as conjugate-gradient (CG) have been introduced to address this issue. It motivates the design of a less-complex data detection algorithm that is proficient in achieving near-optimal performance in an unconstrained ML space. Preconditioned conjugate-gradient is an approach towards further enhancement of the performance. This article proposes the computationally efficient preconditioned conjugate-gradient-based likelihood ascent search (PCGLAS) detector. PCGLAS detection algorithm achieves a fast update vector within unconstrained ML space in conjugate descent direction with little iteration. Simulation results demonstrate that the proposed algorithm can exert more influence rather than other recent state-of-the-art detection algorithms that achieve promising performance with superior running time efficiency.
Preconditioning conjugate-gradient-based LAS detection for massive MIMO systems
Mitesh Solanki; Shilpi Gupta
International Journal of Ultra Wideband Communications and Systems, Vol. 5, No. 3 (2022) pp. 117 - 125
In massive multiple-input multiple-output (MIMO) wireless systems, the computational load of data detection increases along with the increasing number of antennas. The neighbourhood search algorithms achieve near-optimal performance and these are derived from an inversion of large-dimensional matrices. Recently, linear iterative solvers, such as conjugate-gradient (CG) have been introduced to address this issue. It motivates the design of a less-complex data detection algorithm that is proficient in achieving near-optimal performance in an unconstrained ML space. Preconditioned conjugate-gradient is an approach towards further enhancement of the performance. This article proposes the computationally efficient preconditioned conjugate-gradient-based likelihood ascent search (PCGLAS) detector. PCGLAS detection algorithm achieves a fast update vector within unconstrained ML space in conjugate descent direction with little iteration. Simulation results demonstrate that the proposed algorithm can exert more influence rather than other recent state-of-the-art detection algorithms that achieve promising performance with superior running time efficiency.]]>
10.1504/IJUWBCS.2022.126774
International Journal of Ultra Wideband Communications and Systems, Vol. 5, No. 3 (2022) pp. 117 - 125
Mitesh Solanki
Shilpi Gupta
Department of Electronics Engineering, Sardar Vallabhbhai National Institute of Technology Surat, Gujarat, India ' Department of Electronics Engineering, Sardar Vallabhbhai National Institute of Technology Surat, Gujarat, India
massive MIMO
preconditioned conjugate-gradient
unconstrained likelihood ascent search
maximum-likelihood
2022-11-07T23:20:50-05:00
Copyright © 2022 Inderscience Enterprises Ltd.
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117
125
2022-11-07T23:20:50-05:00
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Energy efficient deployment of multiple UAV mounted base stations: a machine learning-based approach
http://www.inderscience.com/link.php?id=126775
This paper presents an energy efficient approach for the deployment of multiple 5G enabled unmanned aerial vehicle-mounted base stations (UmBSs) in the area where existing network infrastructure has got demolished due to a natural disaster. In our proposed approach, K-means, a machine learning-based technique, is used to position UmBSs based upon which their transmit power is optimised by solving a convex optimisation problem under the constraints of maximum transmit power of UmBS, maximum height of UmBS, and channel capacity. To ensure the QoS requirements, the association of UEs and UmBS is subjected to the constraint of minimum signal to interference plus noise ratio (SINR) threshold. The effectiveness of the proposed approach is demonstrated in terms of average SINR, average channel capacity, and the number of users served. The performance of the proposed approach is compared with the two baseline approaches through MATLAB simulations.
Energy efficient deployment of multiple UAV mounted base stations: a machine learning-based approach
Dilip Mandloi; Rohit Sharma; Rajeev Arya
International Journal of Ultra Wideband Communications and Systems, Vol. 5, No. 3 (2022) pp. 126 - 135
This paper presents an energy efficient approach for the deployment of multiple 5G enabled unmanned aerial vehicle-mounted base stations (UmBSs) in the area where existing network infrastructure has got demolished due to a natural disaster. In our proposed approach, K-means, a machine learning-based technique, is used to position UmBSs based upon which their transmit power is optimised by solving a convex optimisation problem under the constraints of maximum transmit power of UmBS, maximum height of UmBS, and channel capacity. To ensure the QoS requirements, the association of UEs and UmBS is subjected to the constraint of minimum signal to interference plus noise ratio (SINR) threshold. The effectiveness of the proposed approach is demonstrated in terms of average SINR, average channel capacity, and the number of users served. The performance of the proposed approach is compared with the two baseline approaches through MATLAB simulations.]]>
10.1504/IJUWBCS.2022.126775
International Journal of Ultra Wideband Communications and Systems, Vol. 5, No. 3 (2022) pp. 126 - 135
Dilip Mandloi
Rohit Sharma
Rajeev Arya
Department of ECE, National Institute of Technology Patna, Patna, Bihar, 800005, India ' Department of ECE, National Institute of Technology Patna, Patna, Bihar, 800005, India ' Department of ECE, National Institute of Technology Patna, Patna, Bihar, 800005, India
5G enabled UmBS
machine learning
transmit power optimisation
SINR-based user association
2022-11-07T23:20:50-05:00
Copyright © 2022 Inderscience Enterprises Ltd.
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126
135
2022-11-07T23:20:50-05:00
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Reconfigurable sub-6 GHz 5G user-terminal MIMO antenna integrated with ISM 2.4 GHz band
http://www.inderscience.com/link.php?id=126776
In this paper, a two-element, the two-mode reconfigurable multiple-input-multiple-output antenna is reported. The antenna is designed for the 5G 3.5 GHz and ISM 2.45 GHz integrated services. The antenna radiators are meander line-inspired and investigated for different configurations onboard to ensure self-isolation. The switching is realised using a single pin diode-based active circuit. The prototype of the antenna exhibits good impedance matching better than -10 dB, a reasonable gain of 1.2 dBi in ISM 2.4 GHz and 1.8 dBi in 3.5 5G bands and co and cross-polarisation isolation of above -15 dB. The optimised position and orientation of the two antenna elements exhibit excellent self-isolation of 27.6 dB ensuring better MIMO performance parameters with better coverage. The matching between simulation and measurement results are appreciable.
Reconfigurable sub-6 GHz 5G user-terminal MIMO antenna integrated with ISM 2.4 GHz band
Varsharani Madhukar Lad; Kshama Vishwanath Kulhalli; Jayendra Kumar
International Journal of Ultra Wideband Communications and Systems, Vol. 5, No. 3 (2022) pp. 136 - 141
In this paper, a two-element, the two-mode reconfigurable multiple-input-multiple-output antenna is reported. The antenna is designed for the 5G 3.5 GHz and ISM 2.45 GHz integrated services. The antenna radiators are meander line-inspired and investigated for different configurations onboard to ensure self-isolation. The switching is realised using a single pin diode-based active circuit. The prototype of the antenna exhibits good impedance matching better than -10 dB, a reasonable gain of 1.2 dBi in ISM 2.4 GHz and 1.8 dBi in 3.5 5G bands and co and cross-polarisation isolation of above -15 dB. The optimised position and orientation of the two antenna elements exhibit excellent self-isolation of 27.6 dB ensuring better MIMO performance parameters with better coverage. The matching between simulation and measurement results are appreciable.]]>
10.1504/IJUWBCS.2022.126776
International Journal of Ultra Wideband Communications and Systems, Vol. 5, No. 3 (2022) pp. 136 - 141
Varsharani Madhukar Lad
Kshama Vishwanath Kulhalli
Jayendra Kumar
Department of Technology, Shivaji University, Maharashtra †416004, India ' Department of Computer Science and Engineering, D.Y. Patil College of Engineering and Technology, Kolhapur, Maharashtra †416006, India ' School of Electronics Engineering, VIT-AP University, Amaravathi, Andhra Pradesh †522237, India
5G
meander-line
MIMO antenna
reconfigurable antenna
user terminal antenna
2022-11-07T23:20:50-05:00
Copyright © 2022 Inderscience Enterprises Ltd.
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136
141
2022-11-07T23:20:50-05:00
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A comprehensive review of ultra-wideband antennas for 5G applications
http://www.inderscience.com/link.php?id=126777
Globally, wireless communication technology is expanding quickly due to the increasing number of wireless devices. About 20 billion devices were connected to the internet at the end of 2020. As current 1G, 2G, 3G, and 4G LTE technologies have their limitations; researchers have been prompted to seek alternative solutions that can connect billions of devices with higher facilities like smart cities, virtual reality, e-healthcare, and different types of real-time communications. This paper presents an extensive review of concepts and techniques of ultra-wideband (UWB) antennas for fifth-generation (5G) communications and their recent uses in wireless communications leading to higher performance. Fifth-generation antennas are capable of connecting 1 million devices per square kilometre, transmitting high speed data up to 2 GBps, and with a latency less than 10 ms. The goal of this article is to provide microwave researchers with in-depth information on 5G antenna technologies and recent developments.
A comprehensive review of ultra-wideband antennas for 5G applications
Md. Zulfiker Mahmud; Md. Ashik Jiddney; Mahbubur Rahman; M. Samsuzzaman; Ayman A. Althuwayb; Mohammad Tariqul Islam
International Journal of Ultra Wideband Communications and Systems, Vol. 5, No. 3 (2022) pp. 142 - 155
Globally, wireless communication technology is expanding quickly due to the increasing number of wireless devices. About 20 billion devices were connected to the internet at the end of 2020. As current 1G, 2G, 3G, and 4G LTE technologies have their limitations; researchers have been prompted to seek alternative solutions that can connect billions of devices with higher facilities like smart cities, virtual reality, e-healthcare, and different types of real-time communications. This paper presents an extensive review of concepts and techniques of ultra-wideband (UWB) antennas for fifth-generation (5G) communications and their recent uses in wireless communications leading to higher performance. Fifth-generation antennas are capable of connecting 1 million devices per square kilometre, transmitting high speed data up to 2 GBps, and with a latency less than 10 ms. The goal of this article is to provide microwave researchers with in-depth information on 5G antenna technologies and recent developments.]]>
10.1504/IJUWBCS.2022.126777
International Journal of Ultra Wideband Communications and Systems, Vol. 5, No. 3 (2022) pp. 142 - 155
Md. Zulfiker Mahmud
Md. Ashik Jiddney
Mahbubur Rahman
M. Samsuzzaman
Ayman A. Althuwayb
Mohammad Tariqul Islam
Department of Computer Science and Engineering, Jagannath University, Dhaka-1100, Bangladesh ' Department of Computer Science and Engineering, Jagannath University, Dhaka-1100, Bangladesh ' Department of Computer Science and Engineering, Jagannath University, Dhaka-1100, Bangladesh ' Faculty of CSE, Patuakhali Science and Technology University, Patuakhali-8602, Bangladesh ' Department of Electrical Engineering, College of Engineering, Jouf University, Sakaka, Aljouf 72388, Saudi Arabia ' Centre of Advanced Electronic and Communication Engineering, Universiti Kebangsaan Malaysia, Bangi-43600, Selangor, Malaysia
fifth generation
5G
ultra-wideband
UWB
wireless communication
high speed communication
2022-11-07T23:20:50-05:00
Copyright © 2022 Inderscience Enterprises Ltd.
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142
155
2022-11-07T23:20:50-05:00
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Design of dual-band pass filter with two end-to-ends T-shaped resonator and open ended stubs for wireless LAN applications
http://www.inderscience.com/link.php?id=126785
A compact dual-band band pass filter using two end-to-end T-shaped resonator with two symmetrical vertical open-ended stubs and defective ground surface (DGS) is proposed in this article. The proposed filter resonates at 2.41 and 5.52 GHz, which are suitable for application in wireless local area network (WLAN). In addition, mathematical analysis for the equivalent circuit analysis is presented. The proposed dual-band band pass filter provides 3 dB fractional bandwidth of 16.97% and 11.16%, return loss (|RL|) of 20 dB and 24 dB and insertion loss (|IL|) of 0.82 dB and 0.81 dB respectively at resonance frequencies. The simulation of the proposed filter is done with HFSS13 and to validate the simulation, a prototype is fabricated with optimised and miniaturised size found to be (24.7 × 16) mm<SUP align="right">2</SUP>.
Design of dual-band pass filter with two end-to-ends T-shaped resonator and open ended stubs for wireless LAN applications
Anirban Neogi; Jyoti Ranjan Panda
International Journal of Ultra Wideband Communications and Systems, Vol. 5, No. 3 (2022) pp. 156 - 163
A compact dual-band band pass filter using two end-to-end T-shaped resonator with two symmetrical vertical open-ended stubs and defective ground surface (DGS) is proposed in this article. The proposed filter resonates at 2.41 and 5.52 GHz, which are suitable for application in wireless local area network (WLAN). In addition, mathematical analysis for the equivalent circuit analysis is presented. The proposed dual-band band pass filter provides 3 dB fractional bandwidth of 16.97% and 11.16%, return loss (|RL|) of 20 dB and 24 dB and insertion loss (|IL|) of 0.82 dB and 0.81 dB respectively at resonance frequencies. The simulation of the proposed filter is done with HFSS13 and to validate the simulation, a prototype is fabricated with optimised and miniaturised size found to be (24.7 × 16) mm<SUP align="right">2</SUP>.]]>
10.1504/IJUWBCS.2022.126785
International Journal of Ultra Wideband Communications and Systems, Vol. 5, No. 3 (2022) pp. 156 - 163
Anirban Neogi
Jyoti Ranjan Panda
Supreme Knowledge Foundation Group of Institution, Hooghly, 721139, West Bengal, India; School of Electronics Engineering, Kalinga Institute of Industrial Technology (Deemed to be University), Bhubaneswar, 751024, Odisha, India ' Supreme Knowledge Foundation Group of Institution, Hooghly, 721139, West Bengal, India; School of Electronics Engineering, Kalinga Institute of Industrial Technology (Deemed to be University), Bhubaneswar, 751024, Odisha, India
dual-band pass filter
T-shaped resonator
vertical open ended stub
transmission zero
equivalent circuit
defective ground surface
DGS
2022-11-07T23:20:50-05:00
Copyright © 2022 Inderscience Enterprises Ltd.
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156
163
2022-11-07T23:20:50-05:00
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Characterisation of path loss models in wireless sensor networks: scenarios, variables, and open problems
http://www.inderscience.com/link.php?id=126795
Path loss models (PLMs) play a fundamental role in the deployment of wireless sensor networks (WSNs) since they support tasks related to positioning, tracking, and power control, making the end nodes coexist in complex scenarios. Such models are used on design to choose the transmission parameters, guaranteeing that the waves can be demodulated at the receiver. Different models have been proposed to quantify the path loss for general applications; however, WSNs exhibit constraints that make its application unsuitable regarding prediction accuracy. These constraints motivate proposing niche-specific PLMs that meet the WSNs' requirements. This paper identifies the trends in PLMs for WSNs. We have found the variables considered in the models, typical scenarios, reference models used to assess each approach, the most used frequency bands, specific modulations, and the research opportunities and open problems. This characterisation helps designers to establish the PLMs to achieve energy savings, accurate positioning, and reliable links.
Characterisation of path loss models in wireless sensor networks: scenarios, variables, and open problems
Mauricio González-Palacio; Lina M. Sepúlveda-Cano; Diana P. Tobón-Vallejo; César Azurdia-Meza
International Journal of Ultra Wideband Communications and Systems, Vol. 5, No. 3 (2022) pp. 164 - 188
Path loss models (PLMs) play a fundamental role in the deployment of wireless sensor networks (WSNs) since they support tasks related to positioning, tracking, and power control, making the end nodes coexist in complex scenarios. Such models are used on design to choose the transmission parameters, guaranteeing that the waves can be demodulated at the receiver. Different models have been proposed to quantify the path loss for general applications; however, WSNs exhibit constraints that make its application unsuitable regarding prediction accuracy. These constraints motivate proposing niche-specific PLMs that meet the WSNs' requirements. This paper identifies the trends in PLMs for WSNs. We have found the variables considered in the models, typical scenarios, reference models used to assess each approach, the most used frequency bands, specific modulations, and the research opportunities and open problems. This characterisation helps designers to establish the PLMs to achieve energy savings, accurate positioning, and reliable links.]]>
10.1504/IJUWBCS.2022.126795
International Journal of Ultra Wideband Communications and Systems, Vol. 5, No. 3 (2022) pp. 164 - 188
Mauricio González-Palacio
Lina M. Sepúlveda-Cano
Diana P. Tobón-Vallejo
César Azurdia-Meza
Department of Telecommunications Engineering, Universidad de MedellÃn, Carrera 87 #30-65, MedellÃn, Colombia ' Department of Accountancy, Universidad EAFIT, Carrera 49 # 7 Sur †50, MedellÃn, Colombia ' Department of Telecommunications Engineering, Universidad de MedellÃn, Carrera 87 #30-65, MedellÃn, Colombia ' Department of Electric Engineering, Universidad de Chile, Av. Libertador Bernardo O'Higgins 1058, Santiago, Región Metropolitana, Chile
empirical models
internet of things
IoT
path loss
wireless sensor networks
WSNs
2022-11-07T23:20:50-05:00
Copyright © 2022 Inderscience Enterprises Ltd.
5
3
164
188
2022-11-07T23:20:50-05:00