Article
Engineering, Electrical & Electronic
Nicola Piovesan, David Lopez-Perez, Antonio De Domenico, Xinli Geng, Harvey Bao, Merouane Debbah
Summary: This article proposes a novel model for accurately characterizing the power consumption of 5G base stations, based on a large data collection campaign. The model demonstrates high precision and can capture the benefits of energy saving mechanisms. This analytical model is believed to be a fundamental tool for understanding 5G base stations' power consumption and optimizing network energy efficiency.
IEEE COMMUNICATIONS MAGAZINE
(2022)
Article
Multidisciplinary Sciences
Daniel J. Rosenkrantz, Anil Vullikanti, S. S. Ravi, Richard E. Stearns, Simon Levin, H. Vincent Poor, Madhav Marathe
Summary: The ongoing COVID-19 pandemic highlights the importance of reliable forecasting models for decision makers. However, forecasting contagion dynamics remains challenging due to complex behavioral responses, data uncertainty, stochastic processes, and the sensitivity of disease parameters to environmental changes. This study offers a rigorous explanation of the difficulty in short-term forecasting on networked populations using computational complexity concepts and develops efficient algorithms or approximation algorithms for restricted versions of forecasting problems.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Management
Tamar Cohen-Hillel, Kiran Panchamgam, Georgia Perakisc
Summary: In-store promotions are an effective marketing tool that can greatly impact revenue. This research explores the dynamic planning of promotions in the face of Bounded-Memory Peak-End demand models. The study finds that a High-Low pricing policy is optimal under certain conditions and presents algorithms to find near-optimal solutions.
MANAGEMENT SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Anton Kullberg, Isaac Skog, Gustaf Hendeby
Summary: The method presents a computationally efficient way to jointly infer state and learn dynamical models online. By combining a priori known physical models and radial basis function expansion for unknown system dynamics, it reduces computational complexity. It works well for applications with limited correlation in system dynamics.
IEEE TRANSACTIONS ON SIGNAL PROCESSING
(2021)
Article
Engineering, Multidisciplinary
Ke Su, Shuanggen Jin
Summary: This study developed four Galileo five-frequency precise point positioning models and evaluated their performance, showing that multi-frequency observations can significantly improve Galileo PPP performance.
Article
Computer Science, Artificial Intelligence
Peikun Ni, Jianming Zhu, Guoqing Wang
Summary: This article investigates the problem of minimizing the influence of misinformation spread on multi-social networks through entity protection. By analyzing the hardness and approximation property of the problem, the authors propose a two-stage discrete gradient descent (TD-D) algorithm and a two-stage greedy (TG) algorithm. The results show that both algorithms have similar effectiveness in suppressing misinformation spread, but the TG algorithm has a significantly longer running time compared to the TD-D algorithm.
APPLIED INTELLIGENCE
(2023)
Article
Engineering, Electrical & Electronic
Tatsuaki Kimura, Masaki Ogura
Summary: This paper proposes a novel distributed 3D deployment method for unmanned aerial vehicle-mounted base stations, improving overall communication quality in dynamic networks through analyzing performance metrics and utilizing distributed push-sum.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Article
Computer Science, Information Systems
Guido Torrese, Paul Moriceau
Summary: The management of system complexity is crucial for successful system delivery. This study focuses on the definition of structural complexity and provides analytical expressions for both individual components and their interactions. Entropy-based complexity metrics are used to objectively quantify complexity according to the criteria introduced by Weyuker. The intrinsic descriptive complexity by Kolmogorov is applied to analyze the structural complexity of engineered systems, demonstrated using a graph representing system architecture.
IEEE SYSTEMS JOURNAL
(2023)
Article
Mathematics
Veronica Kelsey, Colva M. Roney-Dougal
Summary: We have shown that for a primitive subgroup G of S-n that is not large base, any irredundant base for G has a size of at most 5 log n. This is the first logarithmic bound on the size of an irredundant base for such groups, and it is the best possible.
PACIFIC JOURNAL OF MATHEMATICS
(2022)
Article
Mathematics, Applied
Florent Capelli, Yann Strozecki
Summary: The article discusses the enumeration of DNF formula models, providing solutions for two subclasses and showing how to achieve sublinear delay in formula size. The algorithms presented have constant delays for fixed k-DNF and quadratic delays for monotone formulas, regardless of the formula size.
DISCRETE APPLIED MATHEMATICS
(2021)
Article
Computer Science, Information Systems
Jun Zhang, Qi Zhu
Summary: This paper proposed a joint optimization algorithm based on DCA to maximize the cache hitting probability in a three-tier caching heterogeneous cellular network. The algorithm can achieve higher cache hitting probability with the same density by properly distributing caching contents based on caching devices density.
KSII TRANSACTIONS ON INTERNET AND INFORMATION SYSTEMS
(2021)
Article
Engineering, Geological
Hing-Ho Tsang
Summary: This paper introduces the geotechnical seismic isolation (GSI) technology and its application in engineering practice. The development of equivalent-linear foundation stiffness and damping models, as well as the derivation of dynamic properties for flexible-base systems, provide a theoretical basis for the design of GSI systems. The effectiveness of the proposed design models is verified through response history analyses and a detailed hand-calculation design procedure.
BULLETIN OF EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Aerospace
Ke Su
Summary: With the completed establishment of the Beidou global navigation satellite system (BDS-3), the BDS constellation is now capable of providing global positioning, navigation, and timing services. By simultaneously observing the B1I/B3I signals of the BDS-2 and BDS-3 satellites, a joint precise point positioning (PPP) solution for BDS-2/BDS-3 can be achieved. The study focuses on the analysis and estimation of the BDS pseudorange biases, including pseudorange bias variation, signal distortion bias (SDB), and time delay bias (TDB), and demonstrates that considering these biases can significantly improve the BDS PPP performance.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Computer Science, Artificial Intelligence
Ali Fallah Tehrani
Summary: This study aims to reduce complexity and presents a novel algorithm to enhance the quality of optimization results and computational efficiency of learning predictive models based on the Choquet integral.
Article
Mathematics, Interdisciplinary Applications
Adeeb Noor, Mohammed Bazuhair, Mohamed El-Beltagy
Summary: This study presents a method for modeling the combined stochastic and fractional effects using fractional Brownian motion (fBM) and fractional-order derivatives. Spectral techniques, such as iterated Ito fractional integrals like the fractional Wiener-Hermite (FWHE), are used to analyze models with fBM. The FWHE is generalized and adapted to be consistent with the Malliavin calculus approach, and the conditions for existence and uniqueness are outlined. Using FWHE, the stochastic fractional model is replaced by a deterministic fractional-order system, for which analytical solutions can be obtained. A general numerical algorithm is also described for cases where analytical solutions are not feasible. The algorithm is applied to analyze and simulate a population model with nonlinear losses, demonstrating the efficiency of FWHE in analyzing linear and nonlinear models.
FRACTAL AND FRACTIONAL
(2023)
Article
Chemistry, Analytical
Purva Sharma, Kwonhue Choi, Ondrej Krejcar, Pavel Blazek, Vimal Bhatia, Shashi Prakash
Summary: The deployment and development of optical network infrastructure and new network services are rapidly growing, but optical networks are vulnerable to various security threats. Blockchain technology, with its decentralized and distributed ledger, is a promising solution to protect transactions. However, the evolution of quantum computers may breach the security of blockchain. Therefore, researchers are combining quantum key distribution with blockchain to enhance its security, creating a new technology called quantum-secured blockchain.
Article
Telecommunications
Deepak Kumar, Praveen Kumar Singya, Ondrej Krejcar, Vimal Bhatia
Summary: This paper investigates the performance of overlay full-duplex cooperative cognitive radio network in the presence of imperfect self interference cancellation over generalized alpha - mu fading channels affected by nonlinearity of the propagation medium. The impact of transceiver hardware impairments (HIs) is considered, and a hybrid simultaneous wireless information and power transfer receiver is adopted to overcome the energy constraint problem. A hybrid relaying protocol combining both decode-and-forward and amplify-and-forward relaying protocols is used to improve reliability. Closed-form expressions for outage probability and asymptotic outage probability are derived, along with the diversity order, throughput, and energy efficiency of the network. Optimal values of time switching factor and power splitting factor are obtained to achieve optimum performance. Monte-Carlo simulations validate the derived closed-form expressions.
IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING
(2023)
Article
Optics
Rachna Sharma, Yogesh N. Trivedi, Kamal K. Garg, Vimal Bhatia, Mohammed Abdel-Hafez
Summary: This paper investigates cooperative horizontal and vertical underwater visible light communication (UWVLC) systems using best relay selection. The vertical UWVLC system has the source at the sea surface and the destination at a depth of 60 m. The link between them is modeled with concatenated layers considering non-uniform optical turbulence due to variable refractive index caused by underwater parameters changing with depth. The horizontal communication link is analyzed for two different levels of turbulence at 10 m and 50 m depths. Path losses caused by absorption and scattering are taken into account, and a comprehensive performance comparison is conducted between the horizontal and vertical UWVLC systems. The insights show that vertical links require an extra relay for the same level of performance as horizontal links, and the outage performance of the horizontal system improves with depth.
Article
Engineering, Biomedical
Sumanta Kumar Nanda, Guddu Kumar, Vimal Bhatia, Abhinoy Kumar Singh
Summary: This paper proposes a new model called SEIRRPV model, which considers exposed, infected, recovered, passed away, and vaccinated populations. The model enhances the practicality of administrative measures. The paper also analyzes the characteristics of the model and validates its performance using real COVID-19 outbreak data.
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2023)
Article
Engineering, Electrical & Electronic
R. K. Hindustani, Dharmendra Dixit, Sanjeev Sharma, Vimal Bhatia
Summary: This paper presents the outage probability (OP) performance analysis of a single-input-single-output (SISO) wireless communication system with multiple intelligent reflecting surfaces (IRS) over Rician fading channels, considering the selection of IRS panels. The closed-form expressions for OP are derived using the central limit theorem and Laguerre series expansion. Additionally, the diversity order and coding gain are obtained through simple asymptotic expressions.
PHYSICAL COMMUNICATION
(2023)
Article
Computer Science, Information Systems
Amit Singh, Sanjeev Sharma, Kuntal Deka, Vimal Bhatia
Summary: This paper introduces a deep learning based orthogonal time frequency space (DL-OTFS) modulation system, which can handle doubly dispersive channels and address hardware impairments in high mobility scenarios. Data augmentation is also used to enhance the system performance.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2023)
Article
Computer Science, Information Systems
Abhinav Singh Parihar, Pragya Swami, Kwonhue Choi, Peter Brida, Vimal Bhatia
Summary: This letter examines the performance of PB-assisted downlink cooperative NOMA in a WPCN with a realistic non-linear EH model. An analytical methodology is proposed to improve the performance of blocked users at the network edge through an IN acting as a decode-and-forward relay. IN employs NOMA to serve IoT devices with different quality of service requirements and uses a non-linear EH model to power cooperative transmission. The proposed scheme achieves better performance in terms of outage probability, system throughput, and energy efficiency compared to orthogonal multiple access.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2023)
Article
Telecommunications
Deepak Kumar, Praveen Kumar Singya, Kwonhue Choi, Vimal Bhatia
Summary: This study explores the performance of a simultaneous wireless information and power transfer (SWIPT) enabled cooperative cognitive radio sensor network (CRSN) over generalized Nakagami-m faded channels. A time switching (TS) protocol for SWIPT is used to consider the impact of TS factor on different phases of energy harvesting, information transmission, information processing, and broadcasting. The study also considers the impact of a non-linear power amplifier (NLPA) on network performance, and obtains analytical expressions for outage probability, system throughput, energy efficiency, and ergodic capacity. Monte-Carlo simulations are conducted to validate the obtained analytical expressions.
IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING
(2023)
Article
Computer Science, Information Systems
Sumanta Kumar Nanda, Guddu Kumar, Amit Kumar Naik, Mohammed Abdel-Hafez, Vimal Bhatia, Ondrej Krejcar, Abhinoy Kumar Singh
Summary: This study proposes a new filtering method for the challenging task of state estimation in practical machine-to-machine and IoT deployments, which integrates physical models and measurements to accurately estimate dynamic states. The study addresses the issue of cyber attacks and delayed measurements in a specific type of stochastic nonlinear system, and introduces a new cyber attack model that combines false data injection attacks and delayed measurement. The proposed filter is analyzed for its stochastic stability, and sufficient conditions are established to ensure that the filtering error remains bounded even in the presence of randomly occurring cyber attacks and delayed measurements. The effectiveness and usefulness of the proposed methodology are demonstrated and compared with other widely used approaches using simulated data.
Proceedings Paper
Computer Science, Information Systems
Justin Jose, Parvez Shaik, Shubham Bisen, Vimal Bhatia
Summary: Recently, there has been growing interest in the concept of simultaneously transmitting and reflecting based reconfigurable intelligent surface (STARRIS) due to its ability to serve both halves of a space. This paper analyzes the ergodic rate (ER) of full-duplex based STAR-RIS communication and maximizes it while considering quality-of-service constraints. The paper presents closed-form expressions for the ER of both uplink and downlink users in generalized Nakagami-m fading channels. To mitigate inter-user interference and residual self-interference, a particle swarm optimization algorithm is used to jointly optimize transmission amplitude, element partitioning, and user transmit powers. Extensive Monte Carlo simulations are conducted to verify the accuracy of the results and draw useful insights.
2023 JOINT EUROPEAN CONFERENCE ON NETWORKS AND COMMUNICATIONS & 6G SUMMIT, EUCNC/6G SUMMIT
(2023)
Proceedings Paper
Computer Science, Hardware & Architecture
Deepak Kumar, Praveen Kumar Singya, Vimal Bhatia
Summary: In this paper, the performance of a full-duplex IoT network with hardware impairments over generalized alpha-mu fading channels is investigated. The network employs simultaneous wireless information and power transfer enabled relay nodes for IoT devices to transmit their information to the access point. The alpha-mu fading channel, including various fading channels as special cases, is used to capture the non-linearity of the medium. The impact of hardware impairments, residual self-interference, power splitting factor, and other system parameters on the network performance is highlighted. The derived closed-form expressions are validated through Monte-Carlo simulations.
2023 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE, WCNC
(2023)
Proceedings Paper
Computer Science, Hardware & Architecture
Shubham Bisen, Vimal Bhatia
Summary: Wireless-powered relaying based on backscatter communication is an effective solution to extend transmission range of energy-constrained nodes with improved power efficiency. Non-orthogonal multiple access (NOMA) is a key technology for next-generation wireless communication system, offering massive connectivity, improved spectrum efficiency, and user fairness. Incorporating backscatter communication into NOMA enables more efficient resource utilization and improved performance.
2023 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE, WCNC
(2023)
Proceedings Paper
Computer Science, Hardware & Architecture
Justin Jose, Parvez Shaik, Shubham Bisen, Vinat Goyal, Vimal Bhatia
Summary: Virtual full-duplex (VFD) has emerged as a smart and attractive alternative to full-duplex (FD) systems due to high residual self-interference (RSI) problems. However, existing VFD models based on successive relaying (SR) require extra time and double the number of relays compared to FD. In this work, we propose a novel frequency division duplex (FDD) based VFD (FDD-VFD) that matches FD in resource utilization and outperforms SRVFD and FD in performance. We consider practical scenarios of absence of inter relay interference (A-IRI) and presence of IRI (PIRI), and present closed-form outage probability expressions for both over Nakagami-m fading channels. Particle swarm optimization (PSO) algorithm is utilized to minimize relay interferences in the P-IRI scenario and improve outage performance. Extensive evaluations are conducted to validate the effectiveness of the proposed FDD scheme and obtain optimal design insights.
2023 15TH INTERNATIONAL CONFERENCE ON COMMUNICATION SYSTEMS & NETWORKS, COMSNETS
(2023)
Article
Computer Science, Information Systems
Justin Jose, Anirudh Agarwal, Parvez Shaik, Vinat Goyal, Kwonhue Choi, Vimal Bhatia
Summary: This paper investigates a D2D underlayed cellular system with both D2D and cellular networks enabled with NOMA, which is more efficient and outperforms previous D2D and NOMA models. The authors present closed-form expressions and a deep neural network-based power control mechanism to analyze system performance and minimize SOP. Extensive simulations validate the analytical results and highlight the importance of optimizing power values.
IEEE SYSTEMS JOURNAL
(2023)
Article
Computer Science, Information Systems
Vivek Pathak, Rahul Jashvantbhai Pandya, Vimal Bhatia, Onel Alcaraz Lopez
Summary: This article discusses the potential of utilizing the 0.1 to 10 THz spectrum in next-generation wireless communication networks, as well as the related privacy and security concerns. It proposes an integrated solution of Blockchain Technology (BCT) and Machine Learning (ML) and thoroughly examines their benefits in network security, decentralization, and data sharing. Various distinct topics, such as spectrum refarming, radar-based communication, reconfigurable intelligent surfaces, and visible light communication, are also explored. Additionally, the integration of ML and BCT in novel communication technologies, including molecular, holographic, and semantic communication, is investigated. The article concludes by identifying open issues, challenges, solutions, and future research scope.