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Parallel inverters are commonly adopted in high power applications, for instance wind energy system, smart transformer, and power conditioners. Meanwhile, interleaved PWM is usually considered as an optimal approach to reduce the current ripple and harmonics of the parallel inverters. However, in case of a common dc-link, the problem of circulating current emerges and leads to performance degradation...
In this paper, a new critical-conduction-mode (CRM)-based modulation is proposed for three-phase inverters. With this modulation, soft switching is achieved and the efficiency of the inverter is improved, especially for high frequency operation with SiC MOSFET. In three-phase string PV inverter applications, by operating at switching frequency above 300 kHz, power density of the inverter is estimated...
Following the recent trend in the development of the renewable energy market, complemented with the future and emerging technologies, the leading role of the grid connected converter is well established. In the future energy market, as an interconnecting element, it will serve to secure reliable power supply with extraordinary power quality characteristics. This paper will aim at presenting the basic...
High-speed, image-sensor visible light communication using rolling shutter has been studied. Symbol synchronization method by sequential estimation is applied to the line scan sampling using the rolling shutter of the image sensor and achievable symbol rate is simulated. Over 1400 symbols per second can be realized by the symbol synchronization at the frame rate of 30 fps with a QVGA screen. Acceptable...
The SATURN Enhanced Data Rate (SEDR) waveform has been introduced by Line Of Sight (LOS) NATO standardization group as the new coalition standard for military airborne Ultra High Frequency (UHF) communications. However, the current design of its physical layer presents several shortcomings since it is a straightforward transposition of SATURN definition to wider channels. Indeed, new generation wide-band...
We propose an effective synchronization and digital signal processing scheme for OFDM spectrum slicing transmissions in the presence of a large timing mismatch. Without loss of generality, a 76.8 Gbaud DP-16QAM OFDM three-slice spectrum slicing system was considered.
Automatic Modulation Classification (AMC) has been deeply studied in the context of Cognitive Radio (CR) where it represents a required step between signal detection and demodulation. Several blind methods were proposed in the case of Additive White Gaussian Noise (AWGN) channels. In this context, Analytical Mth-Power nonlinear Transformation (AMPT) was especially studied to tackle the blind AMC of...
In time-slotted molecular communication systems, clock synchronization between transmitter and receiver is crucial. In this paper, training-based synchronization schemes in a molecular communication system with quantity-based modulation are proposed by utilizing the information of arrival times of molecules. For timing offset estimation, three estimators are proposed, including maximum likelihood...
This paper documents development and basic testing of an asymmetric FHSS network. Asymmetric in a way that the network HUB or master consumes a lot of power, while the peripherals or slaves consume as little power as possible. To achieve good consumption, the input only sensors are sleeping most of the time and quickly synchronize into the FHSS scheme upon an event. The main idea explored in this...
All-digital radio frequency transmitters (DRFTx) offer many potential benefits for future RF applications. However, their design requires the use of nonlinear models that can describe the memory induced, nonlinear behavior of these circuits. The model needs to cover a huge bandwidth and incorporate the behavior of the digital-analog-converter within the DRFTx. Gaining highly synchronous recordings...
In this paper, we concentrate on equalization algorithms for amplitude and phase-modulated (APM) signals in non-cooperative burst communication, and have designed a multi-modulus blind equalization algorithm based on cyclic iteration. The algorithm could achieve a faster and more effective blind equalization while just using the samples of the receiver. Proposed scheme has a lower complexity, better...
Industry 4.0 (I4.0) closed-loop control applications require ultra low-latency and ultra high reliability. Generalized Frequency Division Multiplexing (GFDM) promises to meet these requirements in conjunction with low Out-Of-Band (OOB) emissions. We present latency measurements of an open-source, modular, portable GFDM software implementation using the GNU Radio framework. The used implementation...
This paper develops a brand new approach towards data transfer using position-modulated pulses. The core idea is to encode a data value in terms of the time gap between two transmitted pulses whose positions are modulated accordingly. It is shown that this concept allows sending a data value using significantly less number of pulses or logical bits as used in conventional packet-based transports....
Cascaded Multi-level inverter for synchronization of power generated from PV system to utility grid is reported in this paper. Inverters are prone to several types of faults e.g. switch failure or dc link capacitor failure. Failure mode analysis of cascaded H-Bridge is widely discussed in the literature. Various methods for post-fault operation with reduced capacity (due to module failure) but with...
Attractors over OFDM is an emerging research concept which has immense potential for secured communication. The dynamic behavior of Rucklidge system leads to various strange attractors according to varying initial conditions and parameters. In our work one such new strange attractor has been developed and transmitted through OFDM and its behavior has been studied using MATLAB simulation. The performance...
Power Electronic Transformer(PET) is a promising component in the future power system. The PET can offer not only the functions of conventional low frequency transformer, but also many additional functions. Among all the additional functions, the reactive power control function is considered one of the most important one. This paper is discussing the application of reactive power control function...
This work studies the impact of time-synchronization in molecular timing (MT) channels by analyzing three different modulation techniques. The first requires transmitter-receiver synchronization and is based on modulating information on the release timing of information particles. The other two are asynchronous and are based on modulating information on the relative time between two consecutive releases...
The fifth generation of wireless networks (5G) necessitates the use of waveforms with loose constraints on synchronization in multiuser scenarios. Also, carrier aggregation, as a way to better utilize the spectrum in 5G, needs a waveform with low out-of-band (OOB) emissions. Generalized frequency division multiplexing (GFDM) and circular filter bank multicarrier (C-FBMC) are two candidate waveforms...
Deep space optical communications promises orders of magnitude growth in communication capacity, supporting high data rate applications such as video streaming and high- bandwidth science instruments. Pulse position modulation is the modulation format of choice for deep space applications, and by inserting inter-symbol guard times between the symbols, the signal carries the timing information needed...
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