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The Filter Bank Multi-Carrier (FBMC) based systems are being seriously considered for 5G Radio Access Technology (RAT). As FBMC-OQAM is a multi-carrier technique, it suffers from the high Peak-to-Average Power Ratio (PAPR) and directly applying the PAPR reduction schemes proposed for OFDM to FBMC-OQAM turns out to be ineffective, due to its overlapping structure. In this paper, a scheme named as Dispersive...
The focus of this work is put on a cognitive network wherein the secondary users (SUs), based on bit-interleaved-coded orthogonal frequency division multiplexing, share the same band of primary users (PUs). In this context, we develop a distributed power allocation (PA) strategy which minimizes the coded packet error rate (PER) of the noncooperative SU links under the constraint of satisfying the...
A strategy for an indirect matrix converter with two outputs to supply energy to a vector controlled open-end winding induction machine is presented. The modulation schemes for the input and two output stages aim to reduce the virtual DC link voltage for low speed operation and eliminate the zero sequence voltage in the load.
The matrix converter (MC) is an array of controlled bidirectional semi-conductor switches that allows direct ac-ac conversion without an intermediate dc link. To extend its future application, multilevel matrix converter can be a proposed solution due to its merits in multilevel output, high voltage application, high power conversion, improved harmonics issue and less voltage step, etc. This paper...
This paper presents a new, simple and generalized approach to calculate flying capacitor currents for an n-level flying capacitor converter without the use of look-up tables. The performance of the proposed method has been studied for a three-, four- and five-level flying capacitor converter in MATLAB/Simulink environment.
This paper proposes a new five-level voltage source converter (VSC) for medium-voltage high-power applications. The features and operation of the proposed converter is studied. The Space Vector Modulation (SVM) technique is developed to regulate voltages of flying capacitors. The performance of the proposed converter is evaluated by simulation and experimental results.
This paper presents three-phase four-level FLC based electric motor drive for mining application supplied directly from a 6 kV ac-grid. It describes complete control algorithms of the drive with active voltage balancing control. The proposed control is verified by experiments carried out on down-scale drive prototype of rated power of 35 kVA.
This paper has summarized and compared various topologies of three-level non-regenerative rectifiers for aerospace applications. The converter maximum power capacity and current ripple with relation to the input inductance and dc-link voltage has been analytically derived. A modulation method is proposed to dynamically constrain the reference voltage during fast transient response and in case of high...
This paper has proposed a new non-regenerative three-phase four-level rectifier topology with only half of the active devices of the conventional four-level rectifier. Each phase leg has only three active devices. The operation of the rectifier with regards to current path and output voltage levels are analysed. The available voltage vectors in this type of rectifier are constrained by the current...
Passive three-phase rectifier circuits are very popular for ac-dc power conversion. However, they do not have the capability to reverse the power flow, which is demanded by some recent potential smart-grid applications, such as vehicle-to-grid (V2G) power transfer. As an alternative, this paper analyzes the behavior of three-phase ac-dc matrix converters. Among the modulation strategies that minimize...
Adaptive Digital Pre-distortion (DPD) is applied to the typical traveling wave tube amplifier for high-speed 32-APSK satellite communication system. The paper presents research and implementation of adaptive digital pre-distortion. We show first the transmission system model and the adaptive algorithm based on QR decomposition RLS algorithm to achieve adaptive digital pre-distortion. We also present...
Spectrally Efficient Frequency Division Multiplexing (SEFDM) is a non-orthogonal multi-carrier communication technique that can pack more sub-carriers than Orthogonal Frequency Division Multiplexing (OFDM) for a given bandwidth. In this paper, we propose a hybrid soft Iterative Detection (ID) together with Fixed Sphere Decoding (FSD) for QAM modulation schemes from 4QAM to 16QAM. In terms of 4QAM,...
A paradigm to obtain magnetic-free, linear non-reciprocal devices is presented based on biasing with the angular-momentum vector, achieved either by directly spinning a loading material or by imparting spatiotemporal modulation over a substrate. This technique is shown to be applicable to any range of the electromagnetic spectrum, and even to different types of waves, such as acoustic waves. Furthermore,...
Direct Torque Control (DTC) is becoming one of the most popular control methods for induction motors. This technique was introduced in the mid 1980's for voltage fed PWM inverter drives. Matrix converter (MC) has been studied widely for its advantages over the traditional converters. It is gradually employed for applications with its maturity in theoretical studies. A novel control strategy is put...
We propose a simple realization of a 2-dimensonal (2D) PT-symmetric photonic structure: a honeycomb arrangement of alternating cylinders with gain or loss in a dielectric background. The structure provides a periodic modulation of the refractive index on the wavelength scale, which combined with an anti-symmetric gain/loss distribution on the same scale, leads to non-reciprocal light coupling at resonance...
In this work a full characterization in the Stokes space is presented of diverse polarization issues associated with non-linear effects such as Cross Phase Modulation (XPM) and Four Wave Mixing (FWM). A high resolution spectral polarimetry technique has been applied that allows simultaneous visualization of the polarization parameters in the full spectral range of interest. The state of polarization...
The demand of energy is increasing day by day and the fossil fuels are moving towards the end. There comes the portance of non-ending sources like wind energy. The proposed system is a wind energy conversion system consisting of Z source inverter(ZSI). Z source inverter is the one which can invert DC and buck boost operation is also possible. It carries more advantages than conventional buck boost...
This paper presents a review of modulation and control strategies for matrix converters applied to permanent magnet synchronous generator (PMSG) in wind power generation systems. Modulation techniques already discussed in scientific literature for the command of matrix converters are mostly divided into three categories: the scalar modulations, the pulse width modulations and the predictive control...
The paper presents study of a drive system with matrix converter fed permanent magnet synchronous motor. In the control system is implemented a rotor-oriented vector control and a space vector modulation of output currents. The system simulation, experimental test results and comparison of both are presented. The main aim is to show a drive system with a matrix converter as an alternative solution...
Two-phase induction motor (TPIM) can be controlled using a 4-leg voltage source inverter (VSI) topology. A space vector based space vector pulse width modulation (SVM) is proposed in this paper for the 4-leg VSI by decomposing it into a dual single phase full-bridge VSIs. The switching algorithm is envisaged by exploiting the principles of SVM of three-phase VSIs. The implementation of the proposed...
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