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 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
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
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
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
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
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
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
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
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
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
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
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