Enis Kocan

Enis Kocan
University of Montenegro | UCG · Faculty of Electrical Engineering

Professor

About

76
Publications
9,945
Reads
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349
Citations
Citations since 2017
32 Research Items
235 Citations
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201720182019202020212022202301020304050
201720182019202020212022202301020304050
Introduction
Research areas include: Phy and MAC layer solutions for 5G and beyond; Wireless IoT communication solutions; Low EMF exposure wireless communications; Advanced WLAN solutions; Maritime communications

Publications

Publications (76)
Article
Full-text available
We analysed bit error rate (BER) performance of dual-hop OFDM amplify and forward (AF) relay system with fixed gain (FG) at relay station (R), implementing ordered subcarrier mapping (SCM) at R. A scenario with Rayleigh fading statistics on both hops is assumed. In previous works we showed that in the region of small values of average signal-to-noi...
Article
Full-text available
A great number of Internet of Things (IoT) and machine-to-machine (M2M) based applications require energy efficient, long range and low data rate wireless communication links. In order to offer a competitive solution in these areas, IEEE 802.11 standardization group has defined the "ah" amendment, the first sub-1GHz WLAN standard, with flexible cha...
Conference Paper
Full-text available
Index modulation (IM) technique is introduced in orthogonal frequency division multiplexing (OFDM) based systems as an extension of spatial modulation (SM) principle, assuming that information is delivered to the receiver not only through symbols sent by the transmitter, but also through indices of the selected active subcarriers' set. Index modula...
Article
A multi-relay assisted orthogonal frequency division multiplexing (OFDM) system with index modulation (OFDM-IM) is proposed in this letter, assuming that amplify-and-forward (AF) relaying protocol is adopted at relays. Two commonly used AF protocols are considered: fixed-gain (FG) AF and variable-gain (VG) AF relaying protocols. To utilize relays i...
Article
This article is the first thorough study of average population exposure to third generation network (3G)-induced electromagnetic fields (EMFs), from both uplink and downlink radio emissions in different countries, geographical areas, and for different wireless device usages. Indeed, previous publications in the framework of exposure to EMFs general...
Conference Paper
Full-text available
In this paper, we present the core applications of data lakes and other big data infrastructure technologies for the purpose of enhancing the maritime interoperability framework and ensuring resilient collaboration among agencies. The approach is based on the deployment of multi-layered & semantically enabled Data Lakes for storing various maritime...
Article
Full-text available
In this article we deal with the issue of network traffic monitoring in large multi-channel wireless IoT networks. Assuming known link conditions on all radio channels, i.e. connectivity matrix defined through Packet Delivery Ratio on all frequencies and all links between nodes, we propose two methods for defining the number and the positions of sn...
Conference Paper
To obtain insight into the network traffic of wireless sensor networks that cover large areas and operate on multiple channels, more than one sniffer needs to be deployed. In an earlier work, we proposed a distributed sniffer solution, d-Argus, which enables remote access to captured traffic. d-Argus is designed to solve the problem of duplicate pa...
Article
Full-text available
This paper outlines an extensive analysis of the case of Montenegro’s maritime surveillance system becoming integrated within the European Common Information Sharing Environment (CISE). Threats to secure maritime borders across Europe are ever-present and regularly demand coordinated efforts between the member states to tackle and prevent them, e.g...
Preprint
This paper outlines an extensive analysis of the case of Montenegro’s maritime surveillance system becoming integrated within the European Common Information Sharing Environment (CISE). Threats to secure maritime borders across Europe are ever-present and regularly demand coordinated efforts between the member states to tackle and prevent them, e.g...
Conference Paper
Full-text available
The Common Information Sharing Environment (CISE) is an ongoing cooperative development initiative that incrementally incorporates new participants and countries through integrations of facilities for European maritime surveillance. This paper outlines some key processes and technicalities required for becoming a part of the CISE, specifically for...
Conference Paper
Full-text available
WiFi (Wireless Fidelity) networks are nowadays the most used technology for Internet access and besides this, they represent favorable communication solution for many Internet of things (IoT) application areas. However, the radiofrequency (RF) spectrum used by WiFi networks cannot satisfy increasing capacity demands of upcoming multimedia and IoT s...
Preprint
Full-text available
As wireless sensor networks grow larger, more complex and their role more significant, it becomes necessary to have an insight into the network traffic. For this purpose, sniffers play an irreplaceable role. Since a sniffer is a device of limited range, to cover a multi-hop network it is necessary to consider the deployment of multiple sniffers. Th...
Conference Paper
Full-text available
This paper presents exemplar cases of adjusting the operations and taskings of an existing maritime safety administration in the Adriatic towards the emerging technologies for enhanced patrolling in maritime surveillance. This work derives from ongoing COMPASS2020 project that aims to showcase the capabilities of unmanned systems (aerial, underwate...
Article
Full-text available
In this paper, the costs and benefits of the National Maritime Single Window (NMSW) for coastal countries that have limited human resources and infrastructure related to maritime traffic are researched. A general method for conducting a cost-benefit analysis of NMSW implementation is proposed. Using this method and the input data for Montenegro, as...
Article
Full-text available
Tens of thousands of wireless industrial monitoring deployments exist today, logging more than 18 billion operating hours. These solutions have been around for over a decade and are based on standards such as WirelessHART and ISA100.11a to provide performance guarantees to the applications. The new trend in industry deployments is the convergence o...
Conference Paper
The sixth generation of Wi-Fi standards, denoted as IEEE 802.11ax, is gathering research interest as the first Wi-Fi standard to address the Quality of Experience (QoE) in dense environments. Members of the Task Group AX have proposed several solutions for improving spectrum efficiency in high density scenarios. In this paper we analyze efficiency...
Conference Paper
In the development and testing phases of new WSNs, it is of paramount importance to get insight into the traffic exchanged within the network. For this purpose, the sniffers are an irreplaceable tool. In the case where WSN covers a large area, single sniffer cannot provide a trace of the complete data traffic, due to the attenuation of the wireless...
Conference Paper
IEEE 801.11 Working Group is developing the sixth generation of wireless local area network (WLAN) standards, denoted as 802.11ax. The main goal of the new standard is to improve 2,4GHz and 5GHz network performance, in scenarios with multiple overlapping and dense basic service sets (BSSs). In this paper we highlight two novel solutions proposed in...
Conference Paper
Recent expansion of Internet of Things (IoT) application areas has brought to significant number of tested applications and application proposals in maritime industry, which will significantly improve safety, efficiency and reliability of maritime transport. Such a development of different IoT applications in maritime industry is enabled by novel c...
Article
For the ITU-R defined enhanced mobile broadband (eMBB) type of generic services, 5G systems will deploy mmWave communications in indoor environments and open area scenarios in outdoor environment. Besides very high path-losses and reduced diffraction propagation mechanism, communications at these frequencies are known to be vulnerable to blockage e...
Conference Paper
Experimentation on testbeds with Internet of Things (IoT) devices is hard. The tedious firmware development, the lack of user interfaces, the stochastic nature of the radio channel, the testbed learning curve, are some of the factors that make the evaluation process error prone. The impact of such errors on published results can be quite unfortunat...
Conference Paper
OFDM-IM is modulation technique which is able to outperform classical OFDM modulation in terms of spectral and energy efficiency, by exploiting concept of Index Modulation (IM). However, this improvement can be achieved at the expense of worse bit-error-rate (BER) performance for the low to medium signal-to-noise ratio (SNR) values, while for the h...
Conference Paper
IEEE 802.11 standardization body has created and adopted its technical solution for dealing with M2M and IoT requirements, specified under “ah” amendment. 802.11ah represents the first sub-1GHz license-exempt wireless local area network (WLAN) standard. This flexible and scalable communication solution is applicable on wide range of possible use ca...
Conference Paper
We examine possibilities for transmit power reduction both from the relay station (R) and the base station (S - Source) on downlink in dual-hop OFDM decode-and-forward (DF) relay system. Two solutions, known for capacity enhancement in OFDM based relay systems, are applied for improving energy efficiency, while keeping end-user capacity on the same...
Conference Paper
Index modulation (IM) technique is introduced in orthogonal frequency division multiplexing (OFDM) based systems as an extension of spatial modulation (SM) principle, assuming that information is delivered to the receiver not only through symbols sent by the transmitter, but also through indices of the selected active subcarriers' set. Index modula...
Article
Ergodic capacity of dual-hop orthogonal frequency division multiplexing (OFDM) based decode-and-forward (DF) relay system may be significantly enhanced if ordered subcarrier mapping (SCM) is implemented at relay station (R). We proved earlier that this SCM scheme also brings certain bit error rate (BER) performance improvement to assumed system. Ho...
Conference Paper
Orthogonal frequency division multiplexing (OFDM) is modulation technique proven to enable high data rates even in frequency selective wireless fading channels. Recently, OFDM with index modulation (OFDM-IM) is proposed for OFDM performance improvement in terms of spectral and energy efficiency, but at the price of bit error rate (BER) degradation....
Conference Paper
It is expected that 5G communication systems will bring significant performance improvement over 4G. For example, peak data rates are foreseen to be 10 times higher than the ones in 4G (i.e. up to 10Gb/s), and radio link latency should be 10 times lower (less than 1ms). Among other proposed solutions for meeting these requirements is implementation...
Article
Full-text available
Explosive growth of different type of wireless networks in the last decade has raised an issue of influence of electromagnetic fields originating from radio frequencies to human health. Thus, more and more researchers working on the solutions for the next generation wireless communication systems now have in mind the necessity of keeping the level...
Conference Paper
In 2010 IEEE 802.11ah working group has started with work on designing their first standard in sub-GHz spectrum, with the goal to bring a WLAN standard with extended range, which, among other things, could provide communication services in the area of IoT applications. Enhancements of achievable communication range in IEEE 802.11ah are results of m...
Article
In this paper we propose a novel solution for performance enhancement of dual-hop Orthogonal Frequency Division Multiplexing (OFDM) based decode-and-forward (DF) relay system, which assumes that relay station (R) uses more than one antenna for downlink (DL) communications and implements transmit antenna selection (TAS) on subcarrier basis jointly w...
Technical Report
This deliverable D4.3 presents the final absolute exposure index evaluation. It completes the 5-steps common exposure evaluation methodology for each of the WP4 studied solutions. The consolidated results on components and radio link techniques are shown. WP4 analyses and conclusions are delivered and notably attempt to position these different sol...
Conference Paper
Full-text available
In this paper we analyze performance improvement of dual-hop OFDM based Decode-and-Forward (DF) mobile relay system attained through inter-carrier interference (ICI) reduction by pulse shaping techniques. We compare different pulse shaping techniques for ICI reduction in the considered system through analytical derivation of closed-form bit error r...
Conference Paper
Dual-hop OFDM based decode-and-forward (DF) relay system is adopted as a solution for extension of coverage area and performance improvement in LTE-Advanced systems. While the benefits of dividing the communication link between the base station (source – S) and end-user (destination – D) through implementation of relay (R) station are clear, there...
Technical Report
Based on a common evaluation 5-step methodology, initial performance assessments of the innovative solutions considered within WP4 are carried out. A dozen of radio components and transmission techniques solutions are developed and evaluated through ratio of the Exposure Index. The proposed intermediate performances assessments show a large range o...
Conference Paper
Full-text available
In this paper the experimental results and statistical evaluation of the characteristics of the radio signal envelope for the 2.4GHz band, in an indoor environment are presented. The measurements were performed in a hallway, in scenarios assuming different hallway widths and different number of obstacles (moving people) between the transmitter and...
Conference Paper
We derive bit error rate (BER) performance of DPSK modulated dual-hop OFDM amplify-and-forward (AF) relay system with fixed gain (FG) at relay station (R), which implements modified ordered subcarrier mapping (SCM). SCM scheme is modified in sense that one or more subcarriers having the worst channel frequency responses (CFRs) on both hops are omit...
Conference Paper
Full-text available
In this paper bit error rate (BER) performance of DPSK modulated dual-hop OFDM based relay systems implementing ordered subcarrier mapping (SCM) at relay station (R) is analyzed. We propose a new solution, where in the OFDM amplify-and-forward (AF) relay system with fixed gain (FG) at the R station, one or more subcarriers having the lowest signal-...
Technical Report
This work proposes hardware design and transmission techniques that are the state-of-the-art in terms of the development of future technologies to reduce human exposure to electromagnetic waves emanating from radiocommunications systems. Based on a detailled State of the Art review, partners have identified promising individual studies to carry on....
Conference Paper
Full-text available
In this paper we compare different pulse shaping techniques for ICI (inter-carrier interference) reduction in dual-hop OFDM based Decode-and-Forward (DF) relay system. For that purpose, analytical derivation of closed-form bit error probability relations is presented. Scenarios corresponding to downlink communication in cellular systems are conside...
Conference Paper
Full-text available
In this paper, the GRASS-RaPlaT open source radio planning tool is described. The tool is composed of GRASS modules calculating radio coverage prediction using different radio channel models, module considering the influence of antenna radiation pattern and module for calculating and storing the complete radio network coverage. The implemented modu...
Conference Paper
We analysed bit error rate (BER) performance of dual-hop OFDM amplify and forward (AF) relay system with fixed gain (FG) at relay station (R), implementing ordered subcarrier mapping (SCM) at R. A scenario with Rayleigh fading statistics on both hops is assumed. In previous works we showed that in the region of small values of average signal-to-noi...
Conference Paper
Full-text available
OFDM based infrastructure relay station (R), implementing decode-and-forward (DF) relaying, has been included in IMT-Advanced standards, in dual-hop scenarios. Ergodic capacity of such a relay system may be significantly enhanced if ordered subcarrier mapping (SCM) is implemented at R, and, at the same time, bit error rate (BER) performance is impr...
Conference Paper
Full-text available
In this paper we analytically examine the level of bit error rate (BER) performance degradation of dual-hop OFDM based Decode-and-Forward (DF) relay system due to presence of intercarrier interference (ICI). Scenarios which correspond to downlink communication in cellular systems are considered. This assumes Ricean fading channel on the first hop,...
Conference Paper
Full-text available
In this paper ergodic capacity analysis of the dual-hop OFDM decode-and-forward (DF) relay system implementing subcarrier mapping (SCM) at the relay station (R) has been conducted. A scenario with no direct communication between the source of information (S) and destination terminal (D), with Rayleigh fading statistics on both hops is considered. C...
Article
Full-text available
We analyzed the bit error rate (BER) and ergodic capacity performance improvement of dual-hop OFDM amplify and forward (AF) relay system with fixed gain (FG) at relay station (R), all attained through ordered subcarrier mapping (SCM) at R. In previous works we showed that in the region of small values of average signal-to-noise ratios (SNRs) on hop...
Conference Paper
Full-text available
Dual-hop OFDM amplify-and-forward (AF) variable gain (VG) relay systems may improve bit error rate (BER) performance if ordered subcarrier mapping (SCM) is applied at the relay station (R). In previous works we showed that in the region of small and medium values of average signal-to-noise ratios (SNRs) on hops best-to-best SCM (BTB SCM) scheme sho...
Conference Paper
In this paper bit error rate (BER) performance of dual-hop OFDM based Decode-and-Forward (DF) relay system is examined in a scenario with Rician fading channel on the first hop, and time selective Rayleigh fading channel on the second hop. Closed form BER expression is derived for the case of BPSK modulated assumed system. The obtained results are...
Article
Full-text available
It has been shown that cooperative communication schemes can solve many of the issues faced by future broadband WWAN and WLAN networks. It is about communication concept based on resource sharing and coordination among terminals in wireless network that provides significant performance improvements in terms of increased coverage, data rates, capaci...
Conference Paper
Full-text available
It has been shown that cooperative communication schemes can solve many of the issues faced by future broadband WWAN and WLAN networks. It is about communication concept based on resource sharing and coordination among terminals in wireless network that provides significant performance improvements in terms of increased coverage, data rates, capaci...
Conference Paper
Full-text available
In this paper ergodic capacity of dual-hop OFDM amplify-and-forward (AF) fixed gain (FG) relay system, implementing capacity maximizing best-to-best subcarrier mapping (BTB SCM) scheme at the relay (R) station, is examined. Scenario without direct communication between the source of information (S) and destination terminal (D) is considered, with R...
Conference Paper
Full-text available
In this paper the level of bit error rate (BER) performance enhancement achieved by subcarrier mapping (SCM) at the relay (R) station in dual-hop OFDM non-regenerative Variable Gain (VG) relay system, is examined. Closed form BER expressions are derived for the assumed M-QAM (M-ary Quadrature Amplitude Modulation) modulated system, in the case of R...
Data
Full-text available
In this paper we present analytical performance evaluation of dual-hop OFDM amplify-and-forward (AF) variable gain (VG) relay system implementing ordered subcarrier mapping (SCM) at the relay station (R), considered to be a very interesting solution for the next generation mobile cellular networks. A scenario with no direct communication between th...
Article
Recently, it has been shown that cooperative communication schemes can solve many of the issues faced by future broadband WWAN and WLAN networks. It is a novel communication concept based on resource sharing and coordination among units of wireless network, which enables significant performance improvements in terms of coverage, data rates, capacit...
Conference Paper
In this paper, an analitycal expression for the upper bound of the achievable capacity of OFDM amplify-and-forward (AF) relay system with two hops, implementing variable gain (VG) and BTB (Best-to-Best) subcarrier mapping (SCM) scheme at the relay (R) station, is derived. Scenario with the three communication nodes is considered, without direct com...
Conference Paper
Full-text available
BER performance of the DPSK (Differentially Phase Shift Keying) modulated dual-hop OFDM based DF (Decode and Forward) relay system, implementing subcarrier mapping (SCM) at the relay (R) station, is examined. Closed form BER expressions are derived for the two SCM schemes, denoted as BTB SCM (Best-to-Best Subcarrier Mapping) and BTW SCM (Best-to-Wo...
Conference Paper
In this paper, bit error rate (BER) performance of the MIMO OFDM-CDMA system, in case of Ricean frequency selective fading, is evaluated using originally developed computer simulation. The assumed system uses space-time block coding applied to two, three and four transmit antennas and has arbitrary number of receive antennas. Channel estimation is...
Conference Paper
The results given in this paper emphasize another advantage of the presented analytical model for signal decorrelation. It is in the fact that it covers various communication scenarios. Putting correlation coefficient p=0, this model further simplifies to known case of dual diversity with uncorrelated Ricean fading channels. For Ricean K factor K=0...
Conference Paper
Full-text available
BER performance of dual-hop OFDM based relay system can be improved through appropriate subcarrier mapping techniques at the relay (R) station. Depending on the average signal to noise ratio of the links involved, best-to-best subcarrier mapping (BTB SCM) or best-to-worst subcarrier mapping (BTW SCM) should be implemented. In this paper, bit error...
Conference Paper
Full-text available
Very efficient and robust frequency synchronization and channel estimation method based on pilot tone usage, for OFDM systems in the case of slow time varying channels is proposed. The presented method uses preamble consisting of just one OFDM symbol, for channel and frequency offset estimation and additional two pilot tones embedded in each data s...
Conference Paper
Full-text available
We perform error probability analysis of the uncoded OFDM fixed gain amplify-and-forward (AF) relaying system with subcarrier permutation (SCP). Two SCP schemes, named: the best-to-best SCP (BTB SCP) and the best-to-worst SCP (BTW SCP) are considered. Closed-form expressions for the bit error rate (BER) of the above SCP methods are derived. Numeric...
Conference Paper
Full-text available
A frequency synchronization method for the specific OFDM receive diversity system, with implemented frequency domain subcarrier selection combining (SC), is proposed. It has been shown that the assumed diversity system is even more sensitive to frequency synchronization errors than standard OFDM system. Thus, a novel frequency synchronization metho...
Conference Paper
This paper analyzes SER (symbol error rate) performance of OFDM (orthogonal frequency division multiplexing) system with polarization diversity. It is assumed that the system consists of dual polarized transmit and receive antennas. Propagation environment is characterized with Ricean fading and an original method for analytical determination of th...
Conference Paper
Full-text available
In this paper pilot based channel estimation technique with frequency offset correction for OFDM space-time diversity system is proposed. It is shown that the considered system becomes useless for the frequency offset of 0.3% of the subcarrier spacing, if frequency offset correction is not performed. With the proposed estimation technique, the syst...

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Projects (6)
Project
Support the development and inclusion of the national Open Science Cloud initiatives in 15 Member States and Associated Countries in the EOSC governance. Instill within the community the EOSC philosophy and FAIR principles for data Findability, Accessibility, Interoperability and Reusability. Provide technical and policy support for on-boarding of service providers into EOSC, including generic services (compute, data storage, data management), thematic services, repositories and data sets.
Project
EU H2020 Project - SU-BES03-2018-2019-2020 - Demonstration of applied solutions to enhance border and external security. This work has received funding from the European Union’s Horizon 2020 Research and Innovation Programme under Grant Agreement No 833881 (project ANDROMEDA). This article reflects only the author’s views and the Research Executive Agency (REA) is not responsible for any use that may be made of the information it contains. https://www.andromeda-project.eu/ https://cordis.europa.eu/project/id/833881 The project aims to unlock the full potential of CISE, by validating in a long period of time CISE-compatible command, control and coordination systems from several Coast and Border Agencies. At the same time it is envisaged to further enhance, validate and demonstrate CISE by extending its scope for land borders and adapting relevant C2 solutions and associated services. This will be accomplished by extending the CISE data model based on the use cases and requirements and adapting state-of-the-art command & control systems for full compliancy with the enhanced model and CISE message exchange patterns. The project architecture will follow a hybrid scheme in order to allow the usage of the End User CISE Nodes/Gateways and at the same time to allow the testing and validation of the extended data model. The project will leverage on the developments, results and experience of the consortium from current and previous research projects (PERSEUS, CloseEye, MARISA, RANGER), from National Procurement projects of CISE Nodes and Adaptors and on the CISE infrastructure of the End Users.
Archived project