2020_3 - Infocommunications

2020. 3^rd Issue

Volume XII, Number 3

MESSAGE FROM THE EDITOR-IN-CHIEF

Pal Varga
Signal processing, MIMO and 5G business opportunities – hear the latest in Infocommunications

The wide scope of Infocommunications Journal is presented in the current, 2020 autumn issue. Unlike the previous special issues this year, readers with wide range of interest find articles in various topics: from signal processing through RFID anti-collision method comparisons, and about an application for educating children on ear protection. As 5G keeps being the hot topic in applied Infocommunications, our journal provides room for disseminating the latest results in this area, repeatedly.

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PAPERS FROM OPEN CALL

Andrei A. Kalshchikov, Student Member IEEE, Vitaly V. Shtykov and Sergey M. Smolskiy, Member IEEE
The Processing Algorithm for Wideband Signals Propagating in Media with Frequency Dispersion
The new processing algorithm for wideband signals, which are propagating in frequency dispersion media, is developed in the context of the ground penetrating radar technology. The mathematical substantiation of offered method is presented on the base of linear functional spaces. The method is described for calculation acceleration on the base of the recursive approach. Results of numerical modeling of this method are presented for electromagnetic waves propagating in frequency dispersion media at utilization of chirp pulse signals. The Debye model is used as the model of electrical medium properties. The frequency dispersion of losses in the medium is taken into consideration at modeling. Results of operation modeling of the ground penetrating radar are described. Results of this paper will be useful for the ground penetrating radar technology and the ultrasonic flaw detection.

Reference:
DOI: 10.36244/ICJ.2020.3.1
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Chaofu Jing, Zhongqiang Luo, Yan Chen, and Xingzhong Xiong
Blind anti-collision methods for RFID system: a comparative analysis
Radio Frequency Identification (RFID) is one of the critical technologies of the Internet of Things (IoT). With the rapid development of IoT and the extensive use of RFID in our life, the step of RFID development should be faster. However, the tags in an RFID system are more and more utilized, both of them communicate in the same channel. The signal the reader received is mixed, and the reader cannot get the correct message the tags send directly. This phenomenon is often called a collision, which is the main obstacle to the development of the RFID system. Traditionally, the algorithm to solve the collision problem is called the anti-collision algorithm, the widely used anti-collision algorithm is based on Time Division Multiple Access (TDMA) like ALOHA-based and Binary search-based anti-collision algorithm. The principle of the TDMA-based anti-collision algorithm is to narrow the response of tags to one in each query time. These avoidance anti-collision algorithms performance poor when the number of tags is huge, thus, some researchers proposed the Blind Source Separation (BSS)-based anti-collision algorithm. The blind anti-collision algorithms perform better than the TDMA-based algorithms; it is meaningful to do some more research about this filed. This paper uses several BSS algorithms like FastICA, PowerICA, ICA_p, and SNR_MAX to separate the mixed signals in the RFID system and compare the performance of them. Simulation results and analysis demonstrate that the ICA_p algorithm has the best comprehensive performance among the mentioned algorithms. The FastICA algorithm is very unstable, and has a lower separation success rate, and the SNR_MAX algorithm has the worst performance among the algorithms applied in the RFID system. Some advice for future work will be put up in the end.

Reference:
DOI: 10.36244/ICJ.2020.3.2
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Dániel Szántó, Attila Zoltán Jenei, Miklós Gábriel Tulics and Klára Vicsi
Developing a Noise Awareness Rising Web Application within the “Protect your Ears” Project
Noise from our environment is causing evergreater problems such as hearing loss among the young. In many cases, children may be exposed to harmful noise even in the most common places such as schools and events. For this reason, we developed a web application in the frame the “Protect your Ears” project that aims the teaching of noise awareness. Playing with this web application helps children to be more aware in protecting their hearing. The web application was subjected to a cohort study where a test and control group was separated at an elementary school. The test group was able to use the web application for two weeks during the teaching sessions, while the control group could not. For objective measurement, the pedagogue used questionnaires before and after the examination. Statistical analyses were performed on the values obtained from the questionnaires. At the beginning of the study, we showed that the control and test groups were not heterogeneous at 5% significance level using the Mann Whitney U test. As a result, there was a significant difference between the preand post-condition for the test group using the Wilcoxon test at the 5% significance level compering to a control group. From this results, we can conclude that playing with the web application the children in the test group became more aware of the noise in their surrounding and mastered preventive behavior.

Reference:
DOI: 10.36244/ICJ.2020.3.3
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János Ladvánszky
Detection of 2x2 MIMO signals
In this paper, we investigate synchronization and equalization of 2 x 2 MIMO signals. We make a step further than that is described in our patent. In the patent, 3 PLLs and a four-channel adaptive filter was needed. Here we decrease the number of PLLs to two and use an adaptive filter of only four channels. In addition to that, we shortly introduce the filter method and the FFT method as well, for synchronization. False detection cancellation is also mentioned. The so-called 1-bit technique has been compared to our method. After briefly introducing the ideas, detailed Matlab or AWR analyses follow. Input data are real measurements, so the analyses serve also as experimental verifications. We take a glimpse on higher order MIMO and higher order modulations as well.

Reference:
DOI: 10.36244/ICJ.2020.3.4
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Gábor Soós, Dániel Ficzere, Tamás Seres, Sándor Veress and István Németh
Business opportunities and evaluation of non-public 5G cellular networks – a survey
The family of cellular mobile telecommunications standards – including 5G – is mostly defined by the 3GPP standardizing organization. While these are well known in are unfamiliar with the concepts and the content of these documents. It is essential to define and designate how 5G is different from existing wired and wireless technologies, what are the main business benefits, and what are the key potential areas according to the new technology achievements. In our work, we present some fundamental aspects of the 5G business potential, where the key motives lay regarding the Industry 4.0 revolution and the innovation of 5G industrial architectures, including vendors, industrial players, and network operators.

Reference:
DOI: 10.36244/ICJ.2020.3.5
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Botond Tamás Csathó, Bálint Péter Horváth and Péter Horváth
Modeling the near-field of extremely large aperture arrays in massive MIMO systems
Massive multiple-input multiple-output (MIMO) is a key technology in modern cellular wireless communication systems to attain a very high system throughput in a dynamic multi-user environment. Massive MIMO relies on deploying base stations equipped with a large number of antenna elements. One possible way to deploy base stations equipped with hundreds or thousands of antennas is creating extremely large aperture arrays. In this paper, we investigate channel modeling aspects of massive MIMO systems with large aperture arrays, in which many users are located in the near-field of the aperture. Oneand two-dimensional antenna geometries, different propagation models, and antenna element patterns are compared in terms of inter-user correlation, condition number of the multi-user channel matrix, and spectral efficiency to identify key design parameters and essential modeling assumptions. As our analysis reveals by choosing spectral-efficiency as a design objective, the size of the aperture is the critical design parameter.

Reference:
DOI: 10.36244/ICJ.2020.3.6
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