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Preprint ARTICLE | doi:10.20944/preprints202306.0367.v1

Design of Antenna Polarization Plane for Concurrent Uplink/Downlink Drone Networks

Gia Khanh Tran, Takuma Okada

Subject: Engineering, Telecommunications Keywords: Aerial base station; Multiple drones; Circular polarization; Two-ray model; Antennas

Online: 6 June 2023 (03:46:35 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.0343.v1

Design and Implementation of a Versatile openHab IoT Testbed with a Variety of Wireless Interfaces and Sensors

Sotirios Tsakalidis, George Tsoulos, Dimitrios Kontaxis, Georgia Athanasiadou

Subject: Engineering, Telecommunications Keywords: IoT; OpenHAB; Sensors; Wireless communication; Energy efficiency; Occupant comfort; Smart building; Data analysis

Online: 5 June 2023 (16:04:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202306.0144.v1

On Scalability of FDD-based Cell-Free Massive MIMO Framework

Beenish Hassan, Sobia Baig, Saad Aslam

Subject: Engineering, Telecommunications Keywords: cell-free; massive MIMO; scalable FDD; angular reciprocity; dynamic cooperation clustering

Online: 2 June 2023 (07:11:23 CEST)

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Cell-free massive multiple input multiple output (MIMO) has the potential of providing joint services including joint initial access, efficient clustering of access points (APs) and pilot allocation to user equipments (UEs) over large coverage area with reduced interference. In cell-free massive MIMO, large coverage area corresponds to provision and maintenance of scalable quality of service requirements for infinitely large number of UEs. The research in cell free massive MIMO is mostly focused on time division duplex mode due to availability of channel reciprocity which aids in avoiding feedback overhead. However, frequency division duplex (FDD) protocol still dominates the current wireless standards and the provision of angle reciprocity aids in reducing this overhead. The challenge of providing a scalable cell-free massive MIMO system in FDD setting is also prevalent, since computational complexity regarding signal processing tasks such as channel estimation, precoding/combining and power allocation, becomes prohibitively high with increase in number of UEs. In this work, we consider an FDD based scalable cell-free network with angular reciprocity and dynamic cooperation clustering approach. We have proposed scalability for our FDD cell-free and perform comparative analysis with reference to channel estimation, power allocation and precoding/combining techniques. We present expressions for scalable spectral efficiency, angle based precoding/combining schemes and provide comparison of overhead between conventional and scalable angle based estimation as well as combining schemes. Simulations confirm that the proposed scalable cell-free network based on FDD scheme outperforms the conventional matched filtering scheme based on non-scalable precoding/combiming schemes. The angle based LP-MMSE in FDD cell-free network provides 14.3% improvement in spectral efficiency and 11.11% improvement in energy efficiency compared to non-scalable MF scheme.

Preprint ARTICLE | doi:10.20944/preprints202305.1814.v1

Twisted Silica Few-Mode Hollow GeO₂-Doped Ring Core Microstructured Optical Fiber

Anton V. Bourdine, Vladimir V. Demidov, Egishe V. Ter-Nersesyants, Grigori A. Pchelkin, Dmitriy N. Shurupov, Alexander V. Khokhlov, Alexandra S. Matrosova, Andrey I. Kashin, Sergei V. Bureev, Michael V. Dashkov, Alexander S. Evtushenko, Elena S. Zaitseva, Azat R. Gizatulin, Ivan K. Meshkov, Amogh A. Dyavangoudar, Ankur Saharia, Manish Tiwari, Alexander A. Vasilets, Vasiliy S. Elagin, Ghanshyam Singh, Konstantin V. Dukelskii

Subject: Engineering, Telecommunications Keywords: hollow ring core fiber; twisted microstructured optical fiber; chirality; silica GeO2-doped supporting elements; laser beam profile; laser-based few-mode optical signal transmission

Online: 25 May 2023 (14:56:07 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.1700.v1

Research on the Handover Strategy of Heterogeneous Network Based on the Dwell Time of Communication Blind Area

Cheng Zhang, Yanfeng Tang, Xiuzhuo Wang, Yan Zhang, Xiuyang Li

Subject: Engineering, Telecommunications Keywords: visible light communication; heterogeneous networking; ACO-OFDM; communication blind area; horizontal-vertical collaborative handover

Online: 24 May 2023 (05:19:55 CEST)

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Preprint COMMUNICATION | doi:10.20944/preprints202305.1656.v1

Laser-induced Graphene in Polyimide for Antenna Applications

Aivaras Sartanavičius, Justina Žemgulytė, Paulius Ragulis, Karolis Ratautas, Romualdas Trusovas

Subject: Engineering, Telecommunications Keywords: picosecond laser; graphene; LIG; antenna

Online: 23 May 2023 (12:28:55 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0980.v1

Development of a Decision Model for Korean OTT Service Users to Adopt Wireless D2D Caching Networks on Their Mobile Devices

Yumi Jang, Seongcheol Kim

Subject: Engineering, Telecommunications Keywords: Mobile OTT service; wireless D2D caching networks; mobile communication technology; OTT content delivery; the analytic hierarchy process (AHP)

Online: 15 May 2023 (05:32:34 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0689.v1

Cross-Tier Interference Mitigation for RIS-Assisted Heterogeneous Networks

Abdel Nasser Soumana Hamadou, Ciira Wa Maina, Moussa Moindze Soidridine

Subject: Engineering, Telecommunications Keywords: RIS; HetNet; Spectral Efficiency; Cross-tier Interference; Optimization; MIMO

Online: 10 May 2023 (04:54:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0514.v1

Compact UHF Circularly Polarized Multi-band quadrifilar antenna for CubeSat

Manh Thao Nguyen, Fabien Ferrero, Trinh Le Huy

Subject: Engineering, Telecommunications Keywords: Circular Polarization; CubeSat; Multi-band Antenna; Antenna on Structure

Online: 8 May 2023 (10:26:45 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202305.0470.v1

Research of a Fiber Sensor Based on Fiber Bragg Grating for Road Surface Monitoring

Gulzhan Kashaganova, Ainur Kozbakova, Timur Kartbayev, Gani Balbayev, Kulzhan Togzhanova, Zhuldyz Alimseitova, Sandugash Orazaliyeva

Subject: Engineering, Telecommunications Keywords: fiber sensor; fiber Bragg grating; monitoring; road surface; temperature; deformation

Online: 8 May 2023 (08:33:44 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0751.v1

Sustainable Soundscape Monitoring of Modified Psycho-Acoustic Annoyance Model With Edge Computing for 5G IoT Systems

Jaume Segura-Garcia, Juan Jose Perez-Solano, Santiago Felici-Castell, Jose Montoya-Belmonte, Jesus Lopez-Ballester, Juan Miguel Navarro

Subject: Engineering, Telecommunications Keywords: 5G-enabled IoT; Sound Quality Metrics; Psycho-acoustic Annoyance; JND

Online: 23 April 2023 (03:46:56 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0657.v1

Physical Layer Security Performance Analysis of RIS-aided Cognitive Radio Networks

Zhangyu Liu, Ji Wang, Hao Jiang, Jun Wang, Xingwang Li, Wenwu Xie

Subject: Engineering, Telecommunications Keywords: Intelligent reflecting surface; Cognitive radio; Physical layer security; Transmit beamforming; Artificial noise

Online: 21 April 2023 (02:27:26 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0474.v1

SpaceSheep: Satellite Communications for Ovine Smart Grazing

Pedro Gonçalves, Daniel Corujo

Subject: Engineering, Telecommunications Keywords: Animal monitoring; IoT; Alarm systems; Satellite communications

Online: 18 April 2023 (03:54:40 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0443.v1

Direction of Arrival (DoA) Estimation Performance for Satellite Applications with Spatial Correlation in a Multipath Environment

Mutmainnah Hasib, Sithamparanathan Kandeepan, Wayne S. T. Rowe, Akram Al-Hourani

Subject: Engineering, Telecommunications Keywords: Direction of Arrival (DoA) Estimation; Multipath Environment; Geostationary Earth Orbit (GEO); Low Earth Orbit (LEO); and Spatial Correlation

Online: 17 April 2023 (10:21:49 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202304.0176.v1

Circular Polarization Annular Leaky-Wave Antenna with Conical and Broadside Beams

Yuchen Ma, Haijiao Yang, Junhong Wang, Ying Zhu, Chong Pan, Xiang Wu

Subject: Engineering, Telecommunications Keywords: Annular leaky-wave antenna; conical and broadside beams; circular polarization

Online: 11 April 2023 (03:13:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints202211.0040.v1

Towards Outdoor Electromagnetic Field Exposure Mapping Generation Using Conditional GANs

Mohammed Mallik, Angesom Ataklity Tesfay, Benjamin Allaert, Esteban Egea Lopez, Jose-Maria Molina-Garcia Pardo, Redha Kassi, Joe Wiart, Davy P. Gaillot, Laurent Clavier

Subject: Engineering, Telecommunications Keywords: EMF exposure; conditional generative adversarial network; optimization

Online: 2 November 2022 (03:43:14 CET)

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Preprint ARTICLE | doi:10.20944/preprints202102.0550.v1

Optical Data Transmission at 44 Tb/s with a Single Integrated Chip Source

Mengxi Tan, Mike Xu, David Moss

Subject: Engineering, Telecommunications Keywords: microcombs; data transmission; filters; high bandwidth; optical

Online: 24 February 2021 (12:59:47 CET)

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Preprint ARTICLE | doi:10.3390/sci2020044

Lasers for Satellite Uplinks and Downlinks

Mark Dmytryszyn, Matthew Crook, Timothy Sands

Subject: Engineering, Telecommunications Keywords: telescopes; lightweight telescope mirrors; adaptive optics; better resolution; increased accuracy; more bandwidth; cluster of satellites; innovative platform; more capabilities into smaller packages; far-shorter time from click to customer

Online: 12 June 2020 (00:00:00 CEST)

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The use of Light Amplification by Stimulated Emission of Radiation (i.e., LASERs or lasers) by the U.S. Department of Defense is not new and includes laser weapons guidance, laser-aided measurements, even lasers as weapons (e.g., Airborne Laser). Lasers in support of telecommunications is also not new. The use of laser light in fiber optics shattered thoughts on communications bandwidth and throughput. Even the use of lasers in space is no longer new. Lasers are being used for satellite-to-satellite crosslinking. Laser communication can transmit orders-of-magnitude more data using orders-of-magnitude less power and can do so with minimal risk of exposure to the sending and receiving terminals. What is new is using lasers as the uplink and downlink between the terrestrial segment and the space segment of satellite systems. More so, the use of lasers to transmit and receive data between moving terrestrial segments (e.g., ships at sea, airplanes in flight) and geosynchronous satellites is burgeoning. This manuscript examines the technological maturation of employing lasers as the signal carrier for satellite communications linking terrestrial and space systems. The purpose of the manuscript is to develop key performance parameters (KPPs) to inform U.S. Department of Defense initial capabilities documents (ICDs) for near-future satellite acquisition and development. By appreciating the history and technological challenges of employing lasers rather than traditional radio frequency sources for satellite uplink and downlink signal carrier, this manuscript recommends ways for the U.S. Department of Defense to employ lasers to transmit and receive high bandwidth, large-throughput data from moving platforms that need to retain low probabilities of detection, intercept, and exploitation (e.g., carrier battle group transiting to a hostile area of operations, unmanned aerial vehicle collecting over adversary areas). The manuscript also intends to identify commercial sector early-adopter fields and those fields likely to adapt to laser employment for transmission and receipt.

Preprint ARTICLE | doi:10.3390/sci2010016

Preparing for Satellite Laser Uplinks and Downlinks

Mark Dmytryszyn, Matthew Crook, Timothy Sands

Subject: Engineering, Telecommunications Keywords: telescopes; lightweight telescope mirrors; adaptive optics; better resolution; increased accuracy; more bandwidth; cluster of satellites; innovative platform; more capabilities into smaller packages; far-shorter time from click to customer

Online: 18 March 2020 (00:00:00 CET)

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The use of Light Amplification by Stimulated Emission of Radiation (i.e., LASERs or lasers) by the U.S. Department of Defense is not new and includes laser weapons guidance, laser-aided measurements, even lasers as weapons (e.g., Airborne Laser). Lasers in support of telecommunications is also not new. The use of laser light in fiber optics shattered thoughts on communications bandwidth and throughput. Even the use of lasers in space is no longer new. Lasers are being used for satellite-to-satellite crosslinking. Laser communication can transmit orders-of-magnitude more data using orders-of-magnitude less power and can do so with minimal risk of exposure to the sending and receiving terminals. What is new is using lasers as the uplink and downlink between the terrestrial segment and the space segment of satellite systems. More so, the use of lasers to transmit and receive data between moving terrestrial segments (e.g., ships at sea, airplanes in flight) and geosynchronous satellites is burgeoning. This manuscript examines the technological maturation of employing lasers as the signal carrier for satellite communications linking terrestrial and space systems. The purpose of the manuscript is to develop key performance parameters (KPPs) to inform U.S. Department of Defense initial capabilities documents (ICDs) for near-future satellite acquisition and development. By appreciating the history and technological challenges of employing lasers rather than traditional radio frequency sources for satellite uplink and downlink signal carriers, this manuscript recommends ways for the U.S. Department of Defense to employ lasers to transmit and receive high bandwidth, large-throughput data from moving platforms that need to retain low probabilities of detection, intercept, and exploitation (e.g., carrier battle group transiting to a hostile area of operations, unmanned aerial vehicle collecting over adversary areas). The manuscript also intends to identify commercial sector early-adopter fields and those fields likely to adapt to laser employment for transmission and receipt.

Preprint ARTICLE | doi:10.20944/preprints201908.0173.v1

Performance Analysis of Large-Scale MU-MIMO With a Simple and Effective Chanel Estimator

Felipe Augusto Pereira de Figueiredo, Claudio Ferreira Dias, Eduardo Rodrigues de Lima, Gustavo Fraidenraich

Subject: Engineering, Telecommunications Keywords: massive MIMO; multi-cell; pilot contamination; channel estimation

Online: 16 August 2019 (07:16:53 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201908.0169.v1

On the Distribution of an Effective Channel Estimator for Multi-Cell Massive MIMO

Felipe Augusto Pereira de Figueiredo, Claudio Ferreira Dias, Fabbryccio A. C. M. Cardoso, Gustavo Fraidenraich

Subject: Engineering, Telecommunications Keywords: massive MIMO; multi-cell; pilot-contamination; channel estimation

Online: 15 August 2019 (14:59:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201908.0165.v1

Initial Results on Deep Learning-Based Pilot Contamination Mitigation in Massive MIMO Systems

Felipe Augusto Pereira de Figueiredo

Subject: Engineering, Telecommunications Keywords: massive MIMO; pilot contamination; deep learning; machine learning

Online: 14 August 2019 (16:01:48 CEST)

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Preprint REVIEW | doi:10.20944/preprints201907.0239.v1

A Comprehensive Survey on Opportunistic Routing Protocols for MANETs: Issues, Challenges and Future Directions

Varun G Menon

Subject: Engineering, Telecommunications Keywords: ad hoc networks; classification; dynamic; mobility; opportunistic routing; performance improvement; review; survey

Online: 22 July 2019 (09:54:10 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201907.0011.v1

An Efficient FPGA-based Frequency Shifter for LTE/LTE-A Systems

Felipe Augusto Pereira de Figueiredo

Subject: Engineering, Telecommunications Keywords: LTE, LTE-A, 4G, PRACH, NCO, time-domain frequency shift, FPGA

Online: 1 July 2019 (11:52:58 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201906.0247.v1

Mitigating Pilot Contamination with Scrambling Sequences

Felipe Augusto Pereira de Figueiredo

Subject: Engineering, Telecommunications Keywords: massive MIMO; pilot contamination; scrambling

Online: 25 June 2019 (08:43:15 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201806.0263.v1

Modeling and Analyzing Multi-tier Millimeter/Micro Wave Hybrid Caching Networks

Jihong Zhao, Shuyuan Zhao, Hua Qu, Gongye Ren

Subject: Engineering, Telecommunications Keywords: Multi-tier hybrid caching networks; stochastic geometry; millimeter wave; average successful delivery probability; performance analysis

Online: 15 June 2018 (15:24:27 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201806.0234.v1

A 35 MHz/105 MHz Dual-Element Focused Transducer for Intravascular Ultrasound Tissue Imaging Using the Third Harmonic

Junsu Lee, Ju-Young Moon, Jin Ho Chang

Subject: Engineering, Telecommunications Keywords: high-frequency ultrasound transducer; intravascular ultrasound; tissue harmonic imaging; dual-frequency IVUS transducer; dual-element IVUS transducer

Online: 14 June 2018 (11:46:44 CEST)

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Preprint ARTICLE | doi:10.20944/preprints201707.0034.v1

Localization in Low Power Wide Area Networks using Wi-Fi Fingerprints

Thomas Janssen, Maarten Weyn, Rafael Berkvens

Subject: Engineering, Telecommunications Keywords: localization; internet of things; low power wide area networks; Wi-Fi; sigfox; fingerprinting

Online: 14 July 2017 (11:30:28 CEST)

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