Results for "Čedomir Stefanović"

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Finite-Length Analysis of Frameless ALOHAOct 28 2016Nov 02 2016In this paper we present an exact finite-length analysis of frameless ALOHA that is obtained through a dynamical programming approach. Monte Carlo simulations are performed in order to verify the analysis. Two examples are provided that illustrate how ... More
Finite-Length Analysis of Frameless ALOHAOct 28 2016In this paper we present an exact finite-length analysis of frameless ALOHA that is obtained through a dynamical programming approach. Monte Carlo simulations are performed in order to verify the analysis. Two examples are provided that illustrate how ... More
Finite-Length Analysis of Frameless ALOHAOct 28 2016Nov 16 2016In this paper we present an exact finite-length analysis of frameless ALOHA that is obtained through a dynamical programming approach. Monte Carlo simulations are performed in order to verify the analysis. Two examples are provided that illustrate how ... More
Joint Estimation and Contention-Resolution Protocol for Wireless Random AccessOct 02 2012We propose a contention-based random-access protocol, designed for wireless networks where the number of users is not a priori known. The protocol operates in rounds divided into equal-duration slots, performing at the same time estimation of the number ... More
Analysis of the Communication Traffic for Blockchain Synchronization of IoT DevicesNov 01 2017Feb 12 2018Blockchain is a technology uniquely suited to support massive number of transactions and smart contracts within the Internet of Things (IoT) ecosystem, thanks to the decentralized accounting mechanism. In a blockchain network, the states of the accounts ... More
Anti-Jamming Strategy for Distributed Microgrid Control based on Power Talk CommunicationDec 21 2016Dec 22 2016In standard implementations of distributed secondary control for DC MicroGrids (MGs), the exchange of local measurements among neighboring control agents is enabled via off-the-shelf wireless solutions, such as IEEE 802.11. However, Denial of Service ... More
Repeat-Authenticate Scheme for Multicasting of Blockchain Information in IoT SystemsApr 15 2019We study the problem of efficiently disseminating authenticated blockchain information from blockchain nodes (servers) to Internet of Things (IoT) devices, through a wireless base station (BS). In existing blockchain protocols, upon generation of a new ... More
Delay and Communication Tradeoffs for Blockchain Systems with Lightweight IoT ClientsJul 19 2018Oct 17 2018The emerging blockchain protocols provide a decentralized architecture that is suitable of supporting Internet of Things (IoT) interactions. However, keeping a local copy of the blockchain ledger is infeasible for low-power and memory-constrained devices. ... More
Distributed Proportional-Fairness Control in MicroGrids via Blockchain Smart ContractsMay 03 2017May 16 2017Residential microgrids (MGs) may host a large number of Distributed Energy Resources (DERs). The strategy that maximizes the revenue for each individual DER is the one in which the DER operates at capacity, injecting all available power into the grid. ... More
Interference Spins: Scheduling of Multiple Interfering Two-Way Wireless LinksJan 06 2015Feb 04 2015Two-way is a dominant mode of communication in wireless systems. Departing from the tradition to optimize each transmission direction separately, recent work has demonstrated that, for time-division duplex (TDD) systems, optimizing the schedule of the ... More
Efficient Blockchain Synchronization for Internet of Things using Signature AmortizationApr 15 2019Apr 18 2019We study the problem of efficiently disseminating authenticated blockchain information from blockchain nodes (servers) to Internet of Things (IoT) devices, through a wireless base station (BS). In existing blockchain protocols, upon generation of a new ... More
Finite-Length Analysis of Frameless ALOHAOct 28 2016Nov 21 2016In this paper we present an exact finite-length analysis of frameless ALOHA that is obtained through a dynamical programming approach. Monte Carlo simulations are performed in order to verify the analysis. Two examples are provided that illustrate how ... More
Assessment of LTE Wireless Access for Monitoring of Energy Distribution in the Smart GridAug 11 2015Nov 30 2015While LTE is becoming widely rolled out for human-type services, it is also a promising solution for cost-efficient connectivity of the smart grid monitoring equipment. This is a type of machine-to-machine (M2M) traffic that consists mainly of sporadic ... More
What Can Wireless Cellular Technologies Do about the Upcoming Smart Metering Traffic?Feb 04 2015Jul 01 2015The introduction of smart electricity meters with cellular radio interface puts an additional load on the wireless cellular networks. Currently, these meters are designed for low duty cycle billing and occasional system check, which generates a low-rate ... More
Communication Aspects of the Integration of Wireless IoT Devices with Distributed Ledger TechnologyMar 05 2019The pervasive need to safely share and store information between devices calls for the replacement of centralized trust architectures with the decentralized ones. Distributed Ledger Technologies (DLTs) are seen as the most promising enabler of decentralized ... More
Reengineering GSM/GPRS Towards a Dedicated Network for Massive Smart MeteringOct 24 2014GSM is a synonym for a major success in wireless technology, achieving widespread use and high technology ma- turity. However, its future is questionable, as many stakeholders indicate that the GSM spectrum should be refarmed for LTE. On the other hand, ... More
Efficient LTE Access with Collision Resolution for Massive M2M CommunicationsOct 24 2014LTE random access procedure performs satisfactorily in case of asynchronous, uncorrelated traffic arrivals. However, when the arrivals are correlated and arrive synchronously, the performance of the random access channel (RACH) is drastically reduced, ... More
Software-Defined Microgrid Control for Resilience Against Cyber AttacksFeb 08 2018Microgrids (MGs) rely on networked control supported by off-the-shelf wireless communications. This makes them vulnerable to cyber-attacks, such as denial-of-service (DoS). In this paper, we mitigate those attacks by applying the concepts of (i) separation ... More
Secure and Robust Authentication for DC MicroGrids based on Power Talk CommunicationDec 21 2016Dec 22 2016We propose a novel framework for secure and reliable authentication of Distributed Energy Resources to the centralized secondary/tertiary control system of a DC MicroGrid (MG), networked using the IEEE 802.11 wireless interface. The key idea is to perform ... More
Coded Pilot Access: A Random Access Solution for Massive MIMO SystemsMay 19 2016We present a novel access protocol for crowd scenarios in massive MIMO (Multiple-input multiple-output) systems. Crowd scenarios are characterized by a large number of users with intermittent access behavior, whereby orthogonal scheduling is infeasible. ... More
Wireless Access in Ultra-Reliable Low-Latency Communication (URLLC)Oct 16 2018The future connectivity landscape and, notably, the 5G wireless systems will feature Ultra-Reliable Low Latency Communication (URLLC). The coupling of high reliability and low latency requirements in URLLC use cases makes the wireless access design very ... More
On Throughput Maximization of Grant-Free Access with Reliability-Latency ConstraintsFeb 21 2019Enabling autonomous driving and industrial automation with wireless networks poses many challenges, which are typically abstracted through reliability and latency requirements. One of the main contributors to latency in cellular networks is the reservation-based ... More
Oscillation modes of dc microdischarges with parallel-plate geometryApr 29 2011May 19 2011Two different oscillation modes in microdischarge with parallel-plate geometry has been observed: relaxation oscillations with frequency range between 1.23 and 2.1 kHz and free-running oscillations with 7 kHz frequency. The oscillation modes are induced ... More
Spatiotemporal profile of emission from oscillating dc micro dischargesApr 29 2011May 19 2011The axial light distributions in parallel-plate dc microdischarges in argon show similar behavior to large scale discharges. Between the low-current Townsend mode and the high current glow mode exists a large region of currents where different oscillations ... More
Axial light emission and Ar metastable densities in a parallel plate dc micro discharge in steady state and transient regimesApr 28 2011Sep 12 2011Axial emission profiles in a parallel plate dc micro discharge (feedgas: argon; discharge gap d=1mm; pressure p=10Torr) were studied by means of time resolved imaging with a fast ICCD camera. Additionally, volt-ampere (V-A) characteristics were recorded ... More
Reliable Reporting for Massive M2M Communications with Periodic Resource PoolingApr 04 2014This letter considers a wireless M2M communication scenario with a massive number of M2M devices. Each device needs to send its reports within a given deadline and with certain reliability, e. g. 99.99%. A pool of resources available to all M2M devices ... More
Coded Splitting Tree ProtocolsJan 30 2013This paper presents a novel approach to multiple access control called coded splitting tree protocol. The approach builds on the known tree splitting protocols, code structure and successive interference cancellation (SIC). Several instances of the tree ... More