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A new cascaded configuration of multi level inverter with reduced switching devices compared to conventional scheme is proposed. Proposed configuration has further advantages of less total harmonic distortion in output voltage and less current rating of the devices compared to the conventional scheme. Detailed analytical study has been made using proposed configuration for both 5-level and 11-level...
This paper presents a 15-bit ΔΣ ADC with 10kHz-BW which can handle 30V CM voltages with high AC CMRR (in excess of 115dB at 10kHz) while operating from a 1.8 V supply. An HV capacitively-coupled chopper at its input enables the accurate sampling of input signals beyond the supply rails. Chopping is used to mitigate the ADC's offset and to enhance its CMRR, especially at high frequencies.
A new architecture of monolithic THz imager adopting a VCO-based signal processing is proposed, and the enhancement of signal-to-noise ratio is analyzed. The 0.5/1.5 THz imagers, implemented in a 65 nm CMOS, show the lower noise equivalent power (NEP) than that of the detector itself, presenting the best NEP among the state-of-the-art imagers. The fully integrated THz imagers do not require external...
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...
LoRa-based (Long Range Communication based) localization systems make use of RSSI (Received Signal Strength Indicator) to locate an object properly in an outdoor environment for IoT (Internet of Things) applications in smart environment and urban networking. The accuracy of localization is highly degraded, however, by noisy environments (e.g., electronic interference, blocking). To address this issue,...
This paper studies on characteristics of common- mode voltage (CMV) of a four-leg matrix converter with balanced and unbalanced load. Four groups of switching states are divided and figures of the relationship between CMV peak value and inductance ratio k together with unbalanced factor are presented. The effect of ratio k on CMV amplitude is similar in balanced or unbalanced load. CMV peak value...
This paper proposes a three-phase grid- connected PV system based on dual-active-bridge (DAB) converters and cascaded multi-level DC/AC converters (CMCs). PV array strings will be connected to DAB converters which will be collected in series by the CMC. In this system, the output power of the PV arrays will be unbalanced once the operating states of the PV arrays are not identical. The unbalanced...
Both channel and phase noise blind recover are proposed and demonstrated to recover the orthogonal-frequency-division-multiplexing (OFDM) signal without using any training symbols or pilot subcarriers in direct-detection optical OFDM. The proposed receivers can achieve similar performance compared to conventional OFDM receivers.
In this paper, a novel two-phase orthogonal frequency division multiplexing-index modulation (OFDM-IM)-aided cooperative relaying protocol is proposed for overlay cognitive radio (CR) networks, where the primary and secondary networks work concurrently over the same spectrum band. In the proposed scheme, OFDM-IM technique is used at the secondary user (SU) to split the transmission space into the...
Transformerless AC voltage regulator with per phase switches which capable to increase of voltage without loss of system current quality is considered. Such a converter can be used as a voltage stabilizer or device for the quality of electricity improving. The results of mathematical modeling and analytical calculation of the rms values by the first currents and voltages harmonics are presented.
This paper presents a performance analysis of adaptive modulation (AM) schemes in multiple-input multiple-output (MIMO) orthogonal space-time block code (OSTBC) systems over Nakagami-M keyhole channels. We consider a constantpower variable discrete-rate AM strategy and assume that the maximum ratio combining (MRC) technique is used at the receiver. Analytical expressions for the average spectral efficiency...
Tree-based RFID identification adopts a binary-tree structure to collect IDs of an unknown set. Tag IDs locate at the leaf nodes and the reader queries through intermediate tree nodes and converges to these IDs using feedbacks from tag responses. Existing works cannot function well under random ID distribution as they ignore the distribution information hidden in the physical-layer signal of colliding...
The analysis of electromagnetic processes in an electric circuit with the semiconductor converter is presented in the paper. The mathematical model for the analysis of electromagnetic processes in the semiconductor converter with power width regulation of the output voltage has been created. The problem of using the method of multiple parameter modulating function has been solved in the research work.
This paper focused on the design of a 2+1- order Switched-current MASH Delta-Sigma ADC with the digital cancellation circuit in TSMC 0.18-µm 1P6M CMOS process. To combat errors in MASH architectures, we have to cancel the errors by utilizing a pertinent digital cancellation circuit; the output of digital code contains the numbers and position of characteristics to the latter part of the digital filter...
In Virtual Antenna Array (VAA) based wireless system, knowledge of users' locations can help the transmitter to achieve interference avoidance by steering the main beam towards the intended recipient. In this work, the idea has been applied to licensed shared access (LSA) based cognitive radio (CR) environment where location aware beam-forming has been implemented on spatially modulated Generalized...
In iMs paper, a novel method for extracting radar fingerprint using the unintentional modulation on radar signals is proposed. Proposed technique decomposes the unintentional modulations into its components using Variational Mode Decomposition (VMD) technique. Then, features that characterize each component are calculated. Simulations using real radar data show that proposed technique can classify...
The performance of a low-complexity detection technique for OFDM-IM over the Nakagami-m fading channel has been analyzed. The orthogonal frequency-division multiplexing with index modulation (OFDM-IM) has recently been used in conjunction with the subcarriers using on-off keying modulation. The result shows improved performance in comparison with the conventional OFDM. The closed-form expression for...
In this paper, a single-inductor dual-input dual-output (SIDIDO) power converter with sequential pulse-skip modulation (SPSM) is proposed for IoT applications. It manages power from a 1.4-V zinc-air battery and a 0.55-V to 0.7-V photovoltaic (PV) module to prolong the battery life. The proposed converter employs buck-boost mode and buck mode for PV module and the battery, respectively, to produce...
A new architecture of class-D amplifier with a multibit delta-sigma modulator control is presented in this paper. In the presented amplifier, the 3-bit 8-level digital outputs of the second-order delta-sigma modulator are utilized to generate switching signals with different pulse widths for the class-D power amplifier. A closed-loop class-D amplifier is adopted by feeding the analog output signal...
In this article, we propose low complexity transmitter and receiver architectures for Faster Than Nyquist communications. Both architectures are based on circular convolutions rather than linear convolutions. These circular architectures allow us to consider a turbo-equalization scheme based on linear MMSE equalization. We can consider low-values for the time compression factor without increasing...
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