تصفح حسب الموضوع "Modulation"
السجلات المعروضة 1 -- 20 من 25
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A downlink index-modulation based nonorthogonal multiple access scheme
( Institute of Electrical and Electronics Engineers Inc. , 2020 , Conference Paper)Massive connectivity and spectral efficiency are among the main defining terms of the future communications era. Therefore, revolutionary technologies are required to keep up with the connectivity and spectrum demands. ... -
A modified modulation scheme for capacitor voltage control of renewable energy-fed grid-connected Z-Source Inverters
( IEEE , 2012 , Conference Paper)An important issue in grid connection applications is boosting the limited output voltage of the renewable energy sources. Two-stage converters are most commonly employed for successful grid connection and optimum power ... -
A new five-phase to three-phase back-to-back current source converter based wind energy conversion system
( IEEE , 2013 , Conference Paper)Wind energy is one of the fastest growing renewable energy sources. The increased penetration of wind power into the utility grid brings challenges such as voltage and frequency fluctuations, generator torque ripples, and ... -
A novel multiport converter switching scheme to integrate multiple renewable energy sources
( John Wiley and Sons Ltd , 2022 , Article)In this paper, an innovative switching scheme named simultaneous space vector modulation (SSVM) is proposed for integrating various AC sources in the energy industry using a unified multiport converter. The proposed SSVM ... -
A Pulsewidth Modulation Technique for High-Voltage Gain Operation of Three-Phase Z-Source Inverters
( Institute of Electrical and Electronics Engineers Inc. , 2016 , Article)Z-source inverter (ZSI) was recently proposed as a single-stage buck-boost dc-ac power conversion topology. It augments voltage boost capability to the typical voltage buck operation of the conventional voltage source ... -
A switched-capacitor multilevel inverter topology employing a novel variable structure nearest-level modulation
( John Wiley and Sons Ltd , 2021 , Article)This article introduces a nine-level switched-capacitor multilevel inverter with twice voltage boosting feature. It also aims at proposing a novel variable structure nearest-level modulation scheme that has been implemented ... -
Adaptive hierarchical cooperative communication using energy harvesting relay
(2013 , Conference Paper)In this paper, we present an adaptive wireless communication system with energy harvesting relay where, two sources wish to send data to a destination via an energy harvesting relay that utilizes hierarchical constellation. ... -
Capacitor voltage balancing using redundant states of space vector modulation for five-level diode clamped inverters
( IEEE , 2010 , Article)A redundancy balancing technique for the five-level diode-clamped inverter is presented, which balances the four dc-link capacitor voltages at high modulation index and high power factor. The technique is based on dividing ... -
Channel modelling and performance analysis of V2I communication systems in blind bend scattering environments
( EMW Publishing , 2014 , Article)In this paper, we derive a new geometrical blind bend scattering model for vehicle-to- infrastructure (V2I) communications. The proposed model takes into account single-bounce and double- bounce scattering stemming from ... -
Cognitive relay-sharing by using hierarchical modulation under interference constraints
( Institute of Electrical and Electronics Engineers Inc. , 2014 , Conference Paper)In this paper, we investigate relay-sharing in cognitive radio (CR) networks to improve the secondary user's (SU's) performance in the presence of interference. It is assumed that the relay is shared simultaneously between ... -
DC-link capacitor voltage balancing for a five-level diode-clamped active power filter using redundant vectors
(2013 , Article)This paper investigates the compensation and modulation processes of the five- level diode-clamped active power filter, compensating a three-phase rectified resistor-inductor load with redundant vectors. From the analysis, ... -
Evaluation of a multilevel cascaded-type dynamic voltage restorer employing discontinuous space vector modulation
( IEEE Industrial Electronics Society , 2010 , Article)In this paper, the application of a cascaded multilevel inverter as a dynamic voltage restorer (DVR) is investigated. Two discontinuous multilevel space vector modulation (SVM) techniques are implemented for DVR control ... -
Grid integration of multiple wind turbines using a multi-port converter - A novel simultaneous space vector modulation
( Elsevier Ltd , 2022 , Article)In this paper, an innovative approach of integrating multiple doubly-fed induction generator (DFIG)-based wind turbines using a single multi-port converter unit, named as a unified expandable power converter (UEPC) is ... -
HVDC shunt tap based on three single-phase half-bridge series-connected MMCs operated under 2L modulation
( Institution of Engineering and Technology , 2019 , Article)In this study, a cost-effective HVDC shunt tap with low-number of relatively low-voltage semiconductor devices and small-sized passive components is proposed. The proposed architecture is based on employing three single-phase ... -
Modified modulation scheme for photovoltaic fed grid-connected three-phase boost inverter
( IEEE , 2013 , Conference Paper)Transformer-less photovoltaic (PV) inverters are the major functional units of modern grid-connected PV energy production systems. In general, two power conversion stages are required when low-voltage unregulated photovoltaic ... -
Multiuser scheduling on downlink communications by using adaptive hierarchical modulation
( Institute of Electrical and Electronics Engineers Inc. , 2015 , Conference Paper)In this paper, we propose a novel downlink system that is able to maximize the number of users which could be served with high correct decoding probability while, minimizing the total consumed energy for data reconstruction ... -
Performance Analysis of Index Modulation Based Multiple Access under Imperfect Channel Estimation
( Institute of Electrical and Electronics Engineers Inc. , 2020 , Conference Paper)Future generations of wireless communication systems are expected to serve a large number of users with different quality of service requirements. Given the limited spectrum resources, the current multiple access schemes ... -
Precoding-Aided Spatial Modulation for the Wiretap Channel with Relay Selection and Cooperative Jamming
( Hindawi Limited , 2018 , Article)We propose in this paper a physical-layer security (PLS) scheme for dual-hop cooperative networks in an effort to enhance the communications secrecy. The underlying model comprises a transmitting node (Alice), a legitimate ... -
Pulse width modulation technique for a three-to-five phase matrix converter with reduced commutations
( Institution of Engineering and Technology , 2016 , Article)Variable-speed multiphase drive systems have become an increasingly important topics compared with conventional three-phase one due to their distinct advantages. This study presents a new pulse width modulation (PWM) ... -
Quasi seven-level operation of multilevel converters with selective harmonic elimination
( Institute of Electrical and Electronics Engineers Inc. , 2014 , Conference Paper)Generally, selective harmonic elimination (SHE) complexity for multilevel inverters increases with the increase in number of levels. In this paper, a novel approach for SHE is introduced. This approach is based on cancelling ...