2019_1 - Infocommunications

2019. 1^st Issue

Volume XI, Number 1

GUEST EDITORIAL

Pál Varga
Infocommunications Journal: over 10 years – HTE: over Seven Decades
INFOCOMMUNICATIONS – the domain that integrates information technology, telecommunications, audiovisual systems from user access to information storage and processing – has changed our quality of life in the last decades. The everincreasing speed of data-exchange, the ultra-high resolution of affordable visual systems, or the ”extraordinary” storage capacity that we instantly access every day became ”ordinary” – we actually got used to the speed how things change around us. It is not simply that we realize such changes, but we build it into our everyday experience, and improve our ”digitalized skills”: we buy our train tickets, get around abroad, or communicate with our relatives much differently than one decade ago.

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PAPERS FROM OPEN CALL

Ani Bicaku, Christoph Schmittner, Patrick Rottmann, Markus Tauber and Jerker Delsing
Security Safety and Organizational Standard Compliance in Cyber Physical Systems
In Industry 4.0 independent entities should interoperate to allow flexible and customized production. To assure the parties that individual components are secured to inter-operate, we investigate automated standard compliance. The standard compliance is defined based on given sets of security and safety requirements for which measurable indicator points are derived. Those reflect configurations of systems recommended by security, safety or process management relevant standards and guidelines, which help to demonstrate the state of compliance. We propose in this paper an approach to automate such an assessment when components are inter-operating with each other by using a monitoring and standard compliance verification framework. The framework will assure the parties that services or devices within their organizations operate in a secure and standard compliant way, without compromising the underlying infrastructure.

Reference:
DOI: 10.36244/ICJ.2019.1.1
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Dimitris Kanellopoulos
Inter-destination Multimedia Synchronization: A Contemporary Survey
The advent of social networking applications, media streaming technologies, and synchronous communications has created an evolution towards dynamic shared media experiences. In this new model, geographically distributed groups of users can be immersed in a common virtual networked environment in which they can interact and collaborate in real- time within the context of simultaneous media content consumption. In this environment, intra-stream and inter-stream synchronization techniques are used inside the consumers’ playout devices, while synchronization of media streams across multiple separated locations is required. This synchronization is nown as multipoint, group or Inter-Destination Multimedia Synchronization (IDMS) and is needed in many applications such as social TV and synchronous e-learning. This survey paper discusses intraand inter-stream synchronization issues, but it mainly focuses on the most well-known IDMS techniques that can be used in emerging distributed multimedia applications. In addition, it provides some research directions for future work.

Reference:
DOI: 10.36244/ICJ.2019.1.2
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Cebrail Çiflikli and Musaab Alobaidi
Combining Alamouti Scheme with Block Diagonalization Beamforming precoding for 5G Technology over Rician Channel
Wireless communication faces a number of adversities and obstacles as a result of fading and co-channel interference (CCI). Diversity with beamformer techniques may be used to mitigate degradation in the system performance. Alamouti space-time-block-code (STBC) is a strong scheme focused on accomplishing spatial diversity at the transmitter, which needs a straightforward linear processing in the receiver. Also, high bit-error-rate (BER) performance can be achieved by using the multiple-input multiple-output (MIMO) system with beamforming technology. This approach is particularly useful for CCI suppression. Exploiting the channel state information (CSI) at the transmitter can improve the STBC through the use of a beamforming precoding. In this paper, we propose the combination between Alamouti STBC and block diagonalization (BD) for downlink multi-user MIMO system. Also, this paper evaluates the system performance improvement of the extended Alamouti scheme, with the implementation of BD precoding over a Rayleigh and Rician channel. Simulation results show that the combined system has performance better than the performance of beamforming system. Also, it shows that the combined system performance of extended Alamouti outperforms the combined system performance without extended Alamouti. Furthermore, numerical results confirm that the Rician channel can significantly improve the combined system performance.

Reference:
DOI: 10.36244/ICJ.2019.1.3
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Gang Qiao, Zeeshan Babar, Lu Ma and Xue Li
Cost Function based Soft Feedback Iterative Channel Estimation in OFDM Underwater Acoustic Communication
Underwater Acoustic (UWA) communication is mainly characterized by bandwidth limited complex UWA channels. Orthogonal Frequency Division Multiplexing (OFDM) solves the bandwidth problem and an efficient channel estimation scheme estimates the channel parameters. Iterative channel estimation refines the channel estimation by reducing the number of pilots and coupling the channel estimator with channel decoder. This paper proposes an iterative receiver for OFDM UWA communication, based on a novel cost function threshold driven soft decision feedback iterative channel technique. The receiver exploits orthogonal matching pursuit (OMP) channel estimation and low density parity check (LDPC) coding techniques after comparing different channel estimation and coding schemes. The performance of the proposed receiver is verified by simulations as well as sea experiments. Furthermore, the proposed iterative receiver is compared with other non-iterative and soft decision feedback iterative receivers.

Reference:
DOI: 10.36244/ICJ.2019.1.4
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Zhongqiang Luo, Wei Zhang, Lidong Zhu and Chengjie Li
Minimum BER Criterion Based Robust Blind Separation for MIMO Systems
In this paper, a robust blind source separation (BSS) algorithm is investigated based on a new cost function for noise suppression. This new cost function is established according to the criterion of minimum bit error rate (BER) incorporated into maximum likelihood (ML) principle based independent component analysis (ICA). With the help of natural gradient search, the blind separation work is carried out through optimizing this constructed cost function. Simulation results and analysis corroborate that the proposed blind separation algorithm can realize better performance in speed of convergence and separation accuracy as opposed to the conventional ML-based BSS.

Reference:
DOI: 10.36244/ICJ.2019.1.5
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Sergey Smolskiy and Alexander Bortsov
Opto-Electronic Oscillator with Mach-Zender Modulator
The non-standard opto-electronic oscillator (OEO) operation is discussed in the generation mode of a single-side optical harmonic on the base of external and internal modulation of the laser signal. The OEO mathematical model is formed basing on laser differential equations for the closed radiofrequency network. With the help of the model offered, the phase noise of OEO radiofrequency oscillations is analyzed. It is shown that phase noise reduction in the circuit with external modulation depends not only on the increased laser power and growth of the geometric length of the optical fiber, but on reduction of the laser phase noise.

Reference:
DOI: 10.36244/ICJ.2019.1.6
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PRACTICAL PAPERS OF APPLIED RESEARCH

Roland Szabo and Aurel Gontean
Sun Tracker Robotic Arm Optical Distance Measurement Evaluation at Different Positions Using Six Sigma Tools
This paper presents an optical distance evaluation solution, for a sun tracker robotic arm, with the help of Six Sigma. With the help of statistical tools any measurement system can be evaluated and a measurement system analysis (MSA) can be easily made. Like every measurement system, optical distance measurement can have errors. Six Sigma tools can evaluate the measurement system and can give useful data about its accuracy. Sometimes measurement system evaluation is done twice. First, initial tests are done, after some fine tuning and error correction is performed, and finally a repeated test is done, to show that the measurement errors were corrected.

Reference:
DOI: 10.36244/ICJ.2019.1.7
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