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73 articles for “Phase shifts.”
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Signal Transmission in Underwater Using Passive Time Reversal for Single and Multiuser
Abstract: This paper describes passive time reversal communications, which enables multiple users to send information simultaneously to the time reversal array. Experimental results at 3.5 kHz with a 1 kHz bandwidth demonstrate that as many as six users can transmit information over a 4 km range in a 120 m deep water using quaternary phase-shift keying (QPSK) modulation, achieving an aggregate data rate of 6 kb/s. Moreover, the same data rate …
Published in Current Trends in Signal Processing · Vol. 6, Issue 2, 2016 · pp. 49–54 Read article
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Spike Detection and Processing of TDEM Signals using Wavelet Transform
Abstract: This paper presents a new method for spike detection, parameterization and processing in ground based Time Domain Electromagnetic (TDEM) signals. Time Domain Electromagnetic methods are used for mineral exploration by sub-surface conductivity measurement of Earth. The Earth’s response measured using inductive sensors are contaminated by spikes in form of sferics and due to load and phase shift in power distribution lines. The spikes present in the measured signal can significantly …
Published in Current Trends in Signal Processing · Vol. 2, Issue 1-3, 2012 · pp. 82–92 Read article
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Designing of OFDM and FBMC System using QAM and QPSK Modulation Technique
Abstract: AbstractThe Fourth generation (4G) and Fifth generation (5G) are the new evolution of the mobile communication system. The fourth generation had been launched in almost all countries and the 5G is very soon launched in many countries. In India, the 5G is launched in the years of 2020s. In this article, we hut the light on the potential and implementation on the multicarrier technology system which is the 5G based …
Published in Journal of Electronic Design Technology · Vol. 9, Issue 3, 2018 · pp. 24–29 Read article
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Circuit Topologies, Operation, Control Schemes and Modulation Techniques of Modular Multilevel Inverter
Abstract: The Modular Multilevel Converter (MMC) is one of the developing topology. MMC has several attractive features such as a modular structure, transformer-less operation, easily scalable in terms of voltage and current, low expense for redundancy and fault tolerant operation and excellent output waveforms quality. Due to these attractive features industry and researcher increased the interest in this converter. This interest results in the development of new power topologies, modulation strategies …
Published in Journal of Power Electronics and Power Systems · Vol. 7, Issue 1, 2017 · pp. 28–40 Read article
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Application and Limitation of Metal Thermochemical Processing
Abstract: The technically intriguing and monetarily feasible technique for enhancing the surface layer of materials is surface engineering. The aim is to establish a vast scope of useable attributes that are separate from the core substrate, together with physical, chemical, electrical, electronic, magnetic, or mechanical, even though the material surface monitors the operational life throughout many implementations. The thermochemical intervention, a type of surface engineering, uses heat diffusion to incorporate non-metal …
Published in Journal of Thin Films, Coating Science Technology & Application · Vol. 9, Issue 3, 2022 · pp. 25–29 Read article
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Power Quality Enhancement in Distribution System using D-STATCOM
Abstract: New solutions based on power electronics have been developed to safeguard commercial and industrial clients against power quality issues on the electrical distribution system, referred to as Custom Power Products. Custom power devices are classified into three categories by their structures such as dynamic voltage regulator (DVR), distribution static compensator (STATCOM) and unified power quality compensator (UPQC).The Distribution Static Compensator (D-STATCOM), one of the custom power product, is a shunt-connected …
Published in Recent Trends in Electronics Communication Systems · Vol. 8, Issue 2, 2021 · pp. 17–22 Read article
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A Review on STATCOM Controller for Power Quality Enhancement in Distributed System
Abstract: New technologies, using power Electronics-based concepts, have been Developed to provide protection for Commercial and industrial customers from Power quality problems on the electrical Distribution system known as Custom Power Products. Custom power devices are classified into three categories by their structures such as dynamic voltage regulator (DVR), distribution static compensator (STATCOM) and unified power quality compensator (UPQC).The Distribution Static Compensator (D-STATCOM), one of the custom power product, is a …
Published in Trends in Electrical Engineering · Vol. 11, Issue 2, 2021 · pp. 24–29 Read article
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Performance Analysis of a Subcarrier Multiplexed Qpsk Modulated Free Space Optical Mimo Transmission Link through Atmospheric Turbulence
Abstract: AbstractFree space optical (FSO) communication shows potential technology for communication. But the main weakness is atmospheric turbulence which causes major transmission destruction for an open air optical communication system. In this paper, the performance of free space optical (FSO) is analyzed using subcarrier multiplexed QPSK intensity modulated OFS link with optical intensity modulation and direct detection for a single input single output (SISO) system considering strong atmospheric turbulence. To overcome …
Published in Trends in Opto-electro & Optical Communication · Vol. 1, Issue 1-3, 2011 · pp. 32–40 Read article
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Performance Analysis of DE-QPSK and π/4 QPSK with MRC Receiver over η-µ fading channel
Abstract: This study presents approximate but simple expression for the average symbol error rate of differentially encoded quadrature phase shift keying (DE-QPSK) and π/4 QPSK with Maximal Ratio Combining (MRC) diversity over independent η-µ fading channels. Numerical results demonstrate the error performance for different values of fading parameter µ for Lth order MRC for Format 1 and Format 2. Furthermore, error performance of both modulation techniques has also been analyzed for …
Published in Journal of Communication Engineering & Systems · Vol. 8, Issue 3, 2018 · pp. 53–59 Read article
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Simulation of Differential Space Time Block Coding
Abstract: AbstractIn such a coherent system, the underlying assumption is that the channel does not change during one frame of data. Thus, it can also be interpreted as the frame length is chosen such that the path gain change during one frame is negligible. This is basically the quasi-static fading assumption that we have used so far. There is a bandwidth penalty due to the number of transmitted pilot symbols. Of …
Published in Journal of Communication Engineering & Systems · Vol. 6, Issue 1, 2016 · pp. 19–25 Read article
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Voltage Stabilization of Electric Vehicle Charger Using Fractional Order PID Controller
Abstract: In this study, a comprehensive analysis of the stability of Phase-Shifted Full Bridge DC-DC converter with zero voltage crossing is carried out by applying PID controller tuned using Ziegler Nichols tuning method, Cohen Coon method and Fractional Order PID controller using Genetic Algorithm optimization technique. First, the system specifications for the fast charging of electric vehicles were defined, from which converter parameters were then calculated. From the converter topology, the …
Published in Journal of Control & Instrumentation · Vol. 13, Issue 2, 2022 · pp. 14–26 Read article
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Development of a DSP Prototype on QPSK Modulator and Demodulator Using Code Composer Studio for Radio Communication Systems
Abstract: As day by day there is increase in mobile telephone users, the bandwidth requirement for each user is mutually increasing. Due to this there is spectral congestion caused and drastic improvements have been taken in the field of mobile communications. Numerous approaches are taken to minimize the bandwidth requirement of each user. One such approach is called as quadrature phase shift keying (QPSK) technique for mobile and satellite applications. QPSK …
Published in Recent Trends in Sensor Research & Technology · Vol. 1, Issue 2, 2014 · pp. 7–15 Read article
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Multiport Bidirectional DC-DC Converter for Hybrid Energy Storage Systems
Abstract: Multiport DC-DC converters are widely used in hybrid energy generation systems, microgrids and electric vehicles to provide stable power to key loads with high power density. In this project, a multiport isolated bidirectional DC-DC converter is anticipated for hybrid energy storage system in microgrids. Microgrids are connected to the nearby renewable energy generation systems as solar, wind, etc. These systems do not provide pure DC voltage for conversion into AC …
Published in Journal of Power Electronics and Power Systems · Vol. 5, Issue 1, 2015 · pp. 9–13 Read article
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Vapor Compression Refrigeration System
Abstract: Refrigeration has been achieved in a variety of methods throughout history, but due to their efficiency anddurability, vapor-compression refrigeration systems (VCRS) have become the favored option. A vapor-compression refrigeration system, in essence, is a system that uses liquid refrigerant in a closed systemthat circulates it through four stages of compression and expansion, transforming it from liquid to vapor.As a result of this change, heat is either absorbed or ejected by …
Published in Journal of Refrigeration, Air conditioning, Heating and ventilation · Vol. 8, Issue 3, 2021 · pp. 30–33 Read article
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Predictive model of wind turbine rotor-blade deflection
Abstract: A simulation process has been developed to predict wind turbine rotor-blade deflection caused by gravity effects. The model is based on the rotor-blade segmentation in finite elements, each one considered as an independent structure. The simulation has been extended to n-elements to make a more precise approach to the real performance. The range of deformation has been determined for a wind turbine rotor-blade analysing the effects of forces that creates …
Published in Journal of Offshore Structure and Technology · Vol. 8, Issue 2, 2021 · pp. 49–63 Read article
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Incorporating Material Fatigue Parameter Determine in The Rolling & Sliding Contact Fatigue Analysis of Gears
Abstract: As the material's intricate stresses and strains are always shifting during phases of loading, determining the predicted equipment working under rolling-sliding contact loads and their fatigue lives (wheels, bearings, and gears) is particularly difficult. Another difficulty is not knowing the precise characteristics of the material used to make the components, which is particularly noticeable. when it comes to heat-treated components, where the material characteristics' values can differ greatly among the …
Published in Journal of Polymer & Composites · Vol. 12, Issue 4, 2024 · pp. 1–5 Read article
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Variation in Diurnal Phase of Cosmic Ray Intensity during 1986–2017
Abstract: Variations of cosmic ray diurnal phase for Oulu, Apatity, Kiel and Moscow neutron monitoring stations through harmonic analysis by Fourier technique have been investigated in the present study. The period of investigation has been taken to be the period of solar cycle 22, 23 and major portion of solar cycle 24; i.e. 1986 to 2017. Diurnal phase is found have tendency to shift towards later hour direction during 1989, 2000 …
Published in Research & Reviews : Journal of Physics · Vol. 7, Issue 3, 2018 · pp. 20–23 Read article
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Novelty of Cascaded Inverter Based Two Stage Power Conditioning Systems for Constant Wind Power Applications
Abstract: Wind energy has proved to be the most promising renewable energy source because of its environmental friendly nature. Wind energy can be generated by harnessing the kinetic energy of atmospheric air. The present concern towards wind turbines is to increase the size of turbine in order to harvest more energy and also to reduce cost of per megawatt capacity. This paper proposes a 2-stage power conversion technique. The first stage …
Published in Journal of Power Electronics and Power Systems · Vol. 6, Issue 1, 2016 · pp. 1–11 Read article
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Performance Analysis of Carrier Frequency Offset (CFO) and Phase Noise in 4G Communication System
Abstract: For telecommunication services the dramatic shift in the market has been made in beginning of 21st century. In these days' communication network the key challenges is to integrate numerous serves, convey the additional data as expeditiously as doable through limited bandwidth and providing high information data rates. For 4G communication systems 3GPP introduced two features Higher Order Modulation and Multiple Input Multiple Output (MIMO) in OFDM system but one limiting …
Published in Journal of Telecommunication, Switching Systems and Networks · Vol. 3, Issue 1, 2016 · pp. 33–46 Read article
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Stretchable Elastomer–Phase Change Composites for Passive Thermal Management in Wearable Electronics
Abstract: Elastomer-embedded phase change material (EPCM) composites are developed as stretchable, leakage-free, and electrically insulating thermal regulation layers for wearable electronics operating under stringent skin-safety requirements. The EPCM architecture comprises microencapsulated organic phase change materials (μPCM, 30–70 wt%) uniformly dispersed within soft elastomer matrices based on PDMS or SEBS-type thermoplastic elastomers, together with low loadings (1–8 wt%) of electrically insulating hexagonal boron nitride (h-BN) fillers to enhance lateral heat transport. Differential …
Published in Journal of Polymer & Composites · Vol. 14, Issue 2, 2026 · pp. 30–41 Read article