2021. 2nd Issue

Volume XIII, Number 2

Table of contents 

Full issue  (9,7 MB)



Pal Varga
Recent Advances in Communication System Management, Security and Performance 
SINCE its first issue just over a decade ago Infocommunications Journal authors, readers, and especially the Editorial Board have wished to witness the journal ranking improve. Due to the sometimes exhaustive review process, the quality of the papers is high – but still, the wide acceptance of our journal got delayed. This has recently changed, and the Infocommunications Journal got ranked into the Q3 quartile in both of its domains, namely in Computer Science and in Electrical and Electronic Engineering – and it is getting closer to receiving an impact factor > 1. Climbing up one quartile and receiving an impact factor is a great recognition; our authors’ work keeps getting more visible and cited widely. Let us all keep up the excellent work and – on behalf of the Editorial Board – let me thank you, dear authors and reviewers, that our journal has passed this milestone.




Gábor Lencse
Checking the Accuracy of Siitperf 
Siitperf is the world’s first free software RFC 8219 compliant SIIT (Stateless IP/ICMP Translation, also called as Stateless NAT64) tester, which implements throughput, frame loss rate, latency and packet delay variation tests. In this paper, we show that the reliability of its results mainly depends on the accuracy of the timing of its frame sender algorithm. We also investigate the effect of Ethernet flow control on the measurement results. Siitperf is calibrated by the comparison of its results with that of a commercial network performance tester, when both of them are used for determining the throughput of the IPv4 routing of the Linux kernel.

DOI: 10.36244/ICJ.2021.2.1


Botond L. Márton, Dóra Istenes and László Bacsárdi
Enhancing the operational efficiency of quantum random number generators 
Random numbers are of vital importance in today’s world and used for example in many cryptographical protocols to secure the communication over the internet. The generators producing these numbers are Pseudo Random Number Generators (PRNGs) or True Random Number Generators (TRNGs). A subclass of TRNGs are the Quantum based Random Number Generators (QRNGs) whose generation processes are based on quantum phenomena. However, the achievable quality of the numbers generated from a practical implementation can differ from the theoretically possible. To ease this negative effect post-processing can be used, which contains the use of extractors. They extract as much entropy as possible from the original source and produce a new output with better properties. The quality and the different properties of a given output can be measured with the help of statistical tests. In our work we examined the effect of different extractors on two QRNG outputs and found that witg the right extractor we can improve their quality.

DOI: 10.36244/ICJ.2021.2.2


András Mihály and László Bacsárdi
Effects of selected noises on the quantum memory satellite based quantum repeaters 
Quantum repeaters are a key part of long-range free-space quantum key distribution. They allow us to circumvent the negative effects of the no-cloning theorem. Quantum repeaters are also a key point in point-to-point communication since otherwise, a direct line of sight would be necessary. In our simulation, we examined the QKD capabilities of quantum repeaters in a satellite-based network, along with selected types of noises.

DOI: 10.36244/ICJ.2021.2.3


Wei Zhang, Zhongqiang Luo, Xingzhong Xiong, and Kai Deng
An Enhanced Impulsive Noise Suppression Method Based on Wavelet Denoising and ICA for Power Line Communication 
Aiming at the problem of noise suppression in power lines, traditional noise suppression methods need to know prior knowledge and other defects. In this paper, blind source separation methods that do not need prior knowledge are selected. In the case of low signal-to-noise ratio, the basic independent component analysis algorithm has poor denoising effect. Therefore, this paper proposes a joint independent component analysis algorithm based on Wavelet denoising and Power independent component analysis (WD-PowerICA). In this work, firstly, the pseudo observation signal is constructed by weighted processing, and the blind separation model of single channel is transformed into a multi-channel determined model. Then, the proposed WD-PowerICA algorithm is used to separate noise and source signals. Finally, the simulation results demonstrate that the proposed algorithm in this paper can effectively separate noise and source signal under low SNR. At the same time, the stronger the α pulse noise is, the closer the WD-PowerICA separated signal is to the source signal. The proposed algorithm is better than the state of the art PowerICA algorithm.

DOI: 10.36244/ICJ.2021.2.4


George Matta, Sebastian Chlup, Abdelkader Magdy Shaaban, Christoph Schmittner, Andreas Pinzenöhler, Elke Szalai and Markus Tauber
Risk Management and Standard Compliance for Cyber-Physical Systems of Systems 

The Internet of Things (IoT) and cloud technologies are increasingly implemented in the form of Cyber-Physical Systems of Systems (CPSoS) for the railway sector. In order to satisfy the security requirements of Cyber-Physical Systems (CPS), domainspecific risk identification assessment procedures have been developed. Threat modelling is one of the most commonly used methods for threat identification for the security analysis of CPSoS and is capable of targeting various domains. This paper reports our experience of using a risk management framework identify the most critical security vulnerabilities in CPSoS in the domain and shows the broader impact this work can have on the domain of safety and security management. Moreover, we emphasize the application of common analytical methods for cyber-security based on international industry standards to identify the most vulnerable assets. These will be applied to a meta-model for automated railway systems in the concept phase to support the development and deployment of these systems. Furthermore, it is the first step to create a secure and standard complaint system by design.

DOI: 10.36244/ICJ.2021.2.5


John Baghous
5G system throughput performance evaluation using Massive-MIMO technology with Cluster Delay Line channel model and non-line of sight scenarios 

The fourth-generation system for mobile cellular communications (4G) has achieved great developments. The main problem here is that, with the passage of time and technical development, the need for new applications and services has emerged, and thus we need a new system that supports these matters in addition to the problems and limitations. One of the main challenges that the 4G system suffers from is the ability to support a larger number of devices, low latency, working in real time, provide greater capacity, in addition to providing a high data rate (bit rate) – hence 4G stands unable to support many new applications. This is what made researchers aspire to overcome these problems or reduce their impact to the maximum extent and this is what we expect to achieve in the new generation (5G). In this research, a presentation was made of the 5G system regarding with one of its most important techniques (Massive MIMO technology), clarification of some concepts related to the study such as throughput and NLOS (Non-Line of Sight), as well as the channel model used. The results of the experiments were presented with the discussion.

DOI: 10.36244/ICJ.2021.2.6



CINTI 2021 / IEEE 21st International Symposium on Computational Intelligence and Informatics
CINTI 2021, Budapest, Hungary

IEEE NOMS 2022 / 18th IEEE/IFIP Network Operations and Management Symposium
IEEE NOMS 2022, Budapest, Hungary

IEEE ICC2022 / IEEE International Conference on Communications
IEEE ICC2022, Seoul, Korea



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National Cooperation Fund, Hungary