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As a signal detection method for multiple-input multiple-output (MIMO) communications, this paper proposes multi-stream constrained search (MSCS) that achieves very good trade-off between computational complexity and bit error rate (BER) performance. The proposed method sets a minimum mean-squared error (MMSE) detection result to the starting point. From this point, MSCS searches for signal candidates...
Advanced power electronic converters can provide the means to control power flow and ensure proper and secure operation of future smart-grid networks. The three-phase, direct matrix converter is an alternative solution to the conventional AC-DC-AC converter for interfacing two AC systems at different voltages and/or frequencies. This paper presents a control analysis of a three-phase matrix converter...
In this paper, we investigate the design of linear precoders for multiple-input multiple-output (MIMO) multiple access channels (MAC). We assume that statistical channel state information (CSI) is available at the transmitters and consider the problem under the practical finite alphabet input assumption. First, we derive an asymptotic (in the large-system limit) weighted sum rate (WSR) expression...
In this paper, we propose a new hardware-efficient ML decoding algorithm for a spatial modulation scheme which is basically constructed by serially concatenating maximum-ratio receive combiners with traditional slicers. With respect to complex multiplications, the new algorithm has a greatly reduced decoding complexity compared to the conventional one, especially, for higher-order modulation. This...
The three-phase PWM delta-switch rectifier is an unidirectional topology that presents interesting features, such robustness and high efficiency. Most of the delta-switch rectifier modulation strategies require current sector identification in order to properly apply the according voltage vectors. This is typically neglected in power factor correction applications due to the low displacement angle...
In this paper we propose new coded modulation for multiple-input and multiple-output (MIMO) communication systems. This coded modulation is a genralised concatenated code. Its inner code is embedded Golden code which we introduce in this paper with a decoding algorithm. Its outer code is a product code with component Reed-Solomon code. We use iterative decoding algorithm for this product code. The...
Collision resolution via interference cancellation (IC) in packet-based random multiple access (RMA) systems is a promising technique to decrease number of retransmissions and increase overall throughput. This paper proposes novel iterative algorithm of IC in OFDM systems for the case when one of the interfering packets is known to the receiver. Comparing to well-known successive interference cancellation...
This paper presents a control technique for smoothing voltage oscillations in the sub-modules of Modular Multilevel Converter during start-up operations of high-power medium-voltage induction motor drive. At steady-state, the power fluctuations in each sub-module at fundamental and 2nd harmonic frequencies generate capacitor voltage oscillations which are much higher as the current frequency decreases...
An algorithm which allows the robot to avoid moving obstacles and to reach the assigned goal is proposed. For this purpose, a dynamical system (DS) modulation matrix is calculated using the distance from the obstacles and their velocity, without the need of an analytical representation of the obstacles. This matrix modulates a generic first order DS, used to generate the desired path, saving the equilibrium...
There has been a growing enthusiasm to use anthropomorphic hands of humanoid robots to manipulate every-day objects and tools designed for humans. However, multi-fingered grasping imposes a formidable control challenge due to the high dimensionality of the joint space and the difficulty to form a functional grip on objects. We propose a hybrid technique based on grasping synergies extracted from kinaesthetic...
Among the voltage vectors of even level inverters there is no voltage vector with zero common mode voltage. Therefore bearing currents, which may cause premature motor bearing failures, will not be eliminated due to generated common mode voltages. To eliminate these currents in even level inverters, instead of elimination of common mode voltage, the main idea is based on an extreme increment of the...
In this paper, the specific-band power minimization precoding technique is incorporated with spectrally precoded OFDM to suppress near spectral sidelobes more efficiently and thus improve the spectral compactness. When the total number of redundant symbols introduced by both spectral precoder and specific-band power minimization precoder is fixed, the proposed OFDM system can find a balance between...
In this paper, we propose algorithms for signal detection in large-scale multiuser {\em spatial modulation multiple-input multiple-output (SM-MIMO)} systems. In large-scale SM-MIMO, each user is equipped with multiple transmit antennas (e.g., 2 or 4 antennas) but only one transmit RF chain, and the base station (BS) is equipped with tens to hundreds of (e.g., 128) receive antennas. In SM-MIMO, in...
Subspace-based blind channel estimation for multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems with repetition index has been proposed in the literature. However, the full-row-rank probability of the signal matrix using the MIMO-based repetition index method is extremely low, especially when low-order modulation or few received OFDM symbols are used. In...
Matrix converter is a type of AC/AC conversion with great potential on the ongoing research and application field of power electronics. In this work, a direct matrix converter is investigated through a Simulink model with Space Vector Modulation (SVM) and the results are compared with the dynamical model of the same converter with Venturini modulation. The SVM technique is revised in a simple dq-plane...
In this paper, we propose a new angle quantization index modulation (AQIM) method, called the difference AQIM (DAQIM) method. The proposed method aims to improve the watermarking performance against gain attacks. Unlike the original AQIM method [1], the DAQIM method quantizes the difference of the two angles instead of the angles themselves. The experimental results demonstrate that our proposed method...
LCL filter is becoming an attractive choice over conventional L filters for grid-connected voltage source inverters (VSI) due to smaller inductor size and better attenuation of the ripple components in the grid current. The modulation of the VSI generates switched voltages which results in distorted currents. In this paper, a simple closed form analytical expression is derived for the higher order...
This paper proposes a novel direct torque control (DTC) scheme to reduce the torque and stator flux ripples for permanent-magnet synchronous motor (PMSM) drives using a relatively low sampling frequency. Unlike the conventional DTC in which the voltage vectors are determined by hysteresis controllers, the proposed DTC uses nonlinear saturation comparators and a duty ratio modulation scheme for switch...
This paper proposes a digital online efficiency optimization technique for DC/DC Dual Half-Bridge Series Resonant Converters. The proposed technique implements an advanced modulation scheme which exploits the degrees of freedom inherently available in the converter modulation space in order to simultaneously regulate the output voltage and maintain the system in its maximum efficiency point. Furthermore,...
The inverter often connects to load or grid through inductor-capacitor (LC) filter for feeding the filtered voltage and current. The carrier based modulation techniques, such as sinusoidal pulse width modulation (SPWM) and space vector modulation (SVM), require some kind of current control in LC filter connected inverter to damp out the LC resonance. The major advantage of flux vector modulation for...
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