Elektronika ir Elektrotechnika Journal Impact Factor & Information

Current impact factor: 0.56

Impact Factor Rankings

2015 Impact Factor Available summer 2016
2014 Impact Factor 0.561
2013 Impact Factor 0.445
2012 Impact Factor 0.411
2011 Impact Factor 0.913
2010 Impact Factor 0.659
2009 Impact Factor 0.439

Impact factor over time

Impact factor

Additional details

5-year impact 0.36
Cited half-life 2.70
Immediacy index 0.13
Eigenfactor 0.00
Article influence 0.05
ISSN 1392-1215

Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: This letter proposes an effective pre-processing technique for robust estimation of signal parameters via rotational invariance techniques (ESPRIT)-based single-tone frequency estimation against an I/Q mismatch. For the implementation of a high-accuracy ranging/radar system, parametric-based algorithms such as MUSIC, ESPRIT and their variations have been adopted due to their superior estimation capability for single-tone frequency estimations. Since most ranging/radar system have the direct conversion architecture, I/Q imbalance problem occurs in the form of spurious frequencies of the frequency spectrum. For this reason, the proposed pre-processing technique is designed to make use of the Hilbert transform structure for received signals. The estimation performance of the proposed pre-processing technique in single-tone frequency is derived and compared with the results from a Monte-Carlo simulation. The root-mean-square error (RMSE) of the proposed method is compared with that of an ESPRIT-based method for various parameters.
    Elektronika ir Elektrotechnika 12/2015;
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    ABSTRACT: This paper is focused on investigation of psychological stress in speech signal using shapes of normalised glottal pulses. The pulses were estimated by two algorithms: the Direct Inverse Filtering and Iterative and Adaptive Inverse Filtering. Normalised glottal pulses are divided into opening and return phase, and a feature vector characterizing each glottal pulse is calculated for a series of n percentage interval in time domain. Each feature vector is created by parameters describing its return to opening phase ratio, namely chosen intervals, kurtosis, skewness, and area. Further, psychological stress is detected by feature vector and four different classifiers. Experimental results show, that the best accuracy approaching 95 % is reached with Gaussian Mixture Models classifier. All the best results were obtained regarding only the interval of 5 % from both phase durations, i.e. for and after pulse peak, where the most significant differences between normal and stressed speech in feature vector are occurred. Presented experiments were performed on our own speech database containing both real stressed speech and normal speech.
    Elektronika ir Elektrotechnika 10/2015; 21(5):59-63. DOI:10.5755/j01.eee.21.5.13336
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    ABSTRACT: This paper presents a meshed microstrip patch antenna for UHF band radio communications. Meshed elements allow making antenna flexible, light and more suitable for wearable devices. Several antennas, intended for PMR446 band with different meshing configurations, have been designed. Un-meshed, semi-meshed and fully meshed microstrip patch antennas have been compared. The analysis was focused on the best tradeoffs between concentration of conductor, gain and front to back ratio. Results below are showing that more than 50 % of conductor can be removed without significant gain reduction. In some cases the meshing gives a reduction of back radiation. The meshed antenna has smaller dimensions in comparison with the unmeshed antenna on the same frequency.
    Elektronika ir Elektrotechnika 08/2015; 21(4). DOI:10.5755/j01.eee.21.4.12778
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    ABSTRACT: In this research paper, a signal propagation for microcells, based on building heights and distance from base station, is examined. The tests were carried out in an urban area. There were measured the signals' path losses from two mobile network base stations depending on buildings highs and distances to them. The "Anritsu Cell Master MT8212A" spectrum analyser was used for signal strength measurements. The results are compared with well-known models. Based on experiment results a new propagation model is proposed for the examined area.
    Elektronika ir Elektrotechnika 08/2015; 21(4). DOI:10.5755/j01.eee.21.4.12786
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    ABSTRACT: This paper proposes and investigates dual-hop Nrelay assisted transmission scheme for interleave-division multiple access with decode-and-forward relaying. In the considered system, chip-by-chip detection method is employed to suppress multiuser interference at relay and destination nodes. We assumed binary phase shift keying modulation and analyse the system under study in terms of bit error rate when the source-relay and relay-destination links experience Weibull fading. Our simulation results show that the dual-hop N-relay assisted decode-and-forward relaying can be a promising alternative for the performance improvement of interleavedivision multiple access by efficiently mitigating the multiuser interference at the relay nodes as well as destination node.
    Elektronika ir Elektrotechnika 08/2015; 21(4). DOI:10.5755/j01.eee.21.4.12787
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    ABSTRACT: Generating electrical power from solar energy is very popular. There are many studies aiming at increasing the efficiency and designing simpler systems. Electrical power generated by PV cells depends on solar irradiances, ambient temperatures and electrical loads. To transfer maximum available power from PV cells to the grid, Maximum Power Point Tracker (MPPT) algorithms have been developed and implemented. In this study, a simpler single-phase single-stage grid connected system has been designed and analysed. The proposed circuit does not require complex circuitries and modulation techniques. A 175 Watt prototype system is implemented. Under different environmental conditions, the control unit forces the system to operate at the maximum available power.
    Elektronika ir Elektrotechnika 08/2015; 21(4). DOI:10.5755/j01.eee.21.4.12782

  • Elektronika ir Elektrotechnika 08/2015; 21(4). DOI:10.5755/j01.eee.21.4.12774
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    ABSTRACT: It is critical in terms of security that numbers used in cryptographic systems are generated by hardware such as Field Programmable Gate Array (FPGA). The most common method to develop high-quality and fast True Random Number Generators (TRNGs) is to use Ring Oscillator (RO). Jitter is mostly used as an approach to provide randomness source in clock signals generated by RO so that random numbers can be generated. Numbers generated by RO based TRNGs are random because jitter generated by RO is random. However, it is a disadvantage that these numbers do not have good statistical properties. Post-processing is applied so as to overcome this disadvantage. In this article, a duplicate system to generate numbers with statistically good properties without post-processing is proposed. The system consists of two TRNGs developed by ROs on two different FPGA boards. The proposed system has six different scenarios with different frequencies and quantity of ROs. It is shown in the proposed system that post-processing is not needed, and numbers are generated in high data rates such as 47.68, 71.52 and 95.37 Mbit/s. The proposed system also successfully passed NIST 800.22 tests.
    Elektronika ir Elektrotechnika 08/2015; 21(4). DOI:10.5755/j01.eee.21.4.12779
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    ABSTRACT: A small-signal stability problem of a synchronous generator influencing a power grid was studied. A thorough theoretical analysis of a simplified linearized model of the synchronous generator connected to an infinite bus was carried out. The described analysis pointed out disadvantages of the conventional linear power system stabilizer. In contrast to the conventional, an original self-tuning power system stabilizer was developed. This stabilizer compacts a linear quadratic regulator and a recursive least square identification method. The study involving numerical simulations and laboratory experiments reveals encouraging results with displayed advantages and feasibility of this novel approach in considered applications.
    Elektronika ir Elektrotechnika 08/2015; 21(4). DOI:10.5755/j01.eee.21.4.12773
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    ABSTRACT: This paper describes the control of multilevel voltage source active rectifier connected directly to ac grid. The proposed topology of multilevel converter is composed of three cascaded H-bridge converters (CHB), thus in this case seven level converter. Designed control algorithm provides direct current control in each phase even under unbalanced load. The main attention is paid to voltage balancing of the individual power cells (H-bridge). The voltage balancing algorithm is designed separately for each power cell. The paper presents simulation and experimental results of designed low-voltage laboratory prototype with rated power of 10 kW.
    Elektronika ir Elektrotechnika 08/2015; 21(4). DOI:10.5755/j01.eee.21.4.12777
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    ABSTRACT: Long and smooth tungsten probe is useful for nano-manipulation. In this paper, an ameliorated straightforward dynamic electrochemical etching method and process for long and smooth tungsten probe fabrication have been developed. The relationships between the apex diameter and the aspect ratio of the probe and the fabrication process parameters have been systematically investigated. It's noticed that by process parameter control, the apex size and the shape of the ultra-sharp probe are controllable and reproducible, and the diameter of the probe can be consistently less than 200 nm while its aspect ratio larger than 8 with the same gradient. To get high efficient yield, the consuming time is also researched. Through practical testing and applications as end-effectors in nano-manipulation, the usability and good quality of the fabricated probes have been verified because of their easy availability, high hardness and wear resistance.
    Elektronika ir Elektrotechnika 08/2015; 21(4). DOI:10.5755/j01.eee.21.4.12775
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    ABSTRACT: In this paper, a hybrid method which combines homothetic multi-hypothesis tracker (HPMHT) and artificial neural networks (ANNs) is presented to solve multiple target tracking problem. The performances of the proposed neural network aided homothetic multi-hypothesis tracker (NNAHPMHT) and the HPMHT are compared for two different test scenarios. It was observed that the estimation performances obtained from the NNAHPMHT are better than those obtained from only the HPMHT. The NNAHPMHT method doesn't require additional complex modeling for tracking multiple targets. The additional implementation time originated from NNAHPMHT is only recall time of the ANN. For this reason, the proposed method is very suitable for realtime implementation.
    Elektronika ir Elektrotechnika 08/2015; 21(4). DOI:10.5755/j01.eee.21.4.12772
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    ABSTRACT: Design of a two axis sun tracking system is much more complex compared to one axis. Tracking the sun could be accomplished by either running algorithms integrated to system or using photoresistances. In this study, mathematical formulation of sun tracking system using photoresistances and its mechanical components, is derived. A new sun tracking system is proposed considering the results of calculation. The system capable of moving in two axis tracks the sun from sunrise to sunset as sunlight is always normal to its surface. So, it profited from sunlight optimally. System stops during cloudy weather or after sunset and so inessential power consumption is prevented. Moreover, consumed energy by the motors providing movement of system is minimized by the new system. Designed two axis sun tracking system is compared with a fixed system and it is observed that 30 % more electrical energy is produced annually.
    Elektronika ir Elektrotechnika 08/2015; 21(4). DOI:10.5755/j01.eee.21.4.12780
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    ABSTRACT: The 2012 World Radiocommunication Conference allocated the 694 MHz-790 MHz (700 MHz) band to the International Telecommunication Union Region 1, which includes also Europe, for the mobile service on a co-primary basis with other services to which this band is allocated on a primary basis, and was identified to the International Mobile Telecommunications. However, countries of Region 1 will also be able to continue the use of these frequencies for their digital terrestrial television services, if necessary. This allocation will be effective immediately after the 2015 World Radiocommunication Conference. The objective of this paper is to assess the electromagnetic compatibility of Digital Video Broadcasting - Terrestrial operating below 694 MHz and mobile broadband (LTE) operating in 700 MHz band. The Minimum Coupling Loss method and Monte Carlo simulation within SEAMCAT software was used for interference analysis. An adjacent channel scenario between Digital Video Broadcasting - Terrestrial and LTE was performed to evaluate the impact of Digital Video Broadcasting - Terrestrial on LTE systems. The results obtained provide the minimum coupling distance required between Digital Video Broadcasting -Terrestrial and LTE in the 700 MHz band to maintain the necessary performance level of the LTE system.
    Elektronika ir Elektrotechnika 08/2015; 21(4). DOI:10.5755/j01.eee.21.4.12788
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    ABSTRACT: This paper proposes an improved Genetic Algorithms (GA) based sparse multipath channels estimation technique with Superimposed Training (ST) sequences. A nonrandom and periodic training sequence is proposed to be added arithmetically on the information sequence for energy efficient channel estimation within the future generation of wireless receivers. This eliminates the need of separate overhead time/frequency slots for training sequence. The results of the proposed technique are compared with the techniques in the existing literature -the notable first order statistics based channel estimation technique with ST. The normalized channel mean-square error (NCMSE) and bit-error-rate (BER) are chosen as performance measures for the simulation based analysis. It is established that the proposed technique performs better in terms of the accuracy of estimated channel; subsequently the quality of service (QoS), while retrieving information sequence at the receiver. With respect to its comparable counterpart, the proposed GA based scheme delivers an improvement of about 1dB in NCMSE at 12dB SNR and a gain of about 2dB in SNR at 10-1 BER, for the population size set at twice the length of channel. It is also demonstrated that, this achievement in performance improvement can further be enhanced at the cost of computational power by increasing the population size.
    Elektronika ir Elektrotechnika 06/2015;