The current issue of the IETE Journal of Research (Vol.65, No.6, Nov-Dec 2019) contains 14 articles. These articles present ongoing research and developments taking place in the broad areas of Computer Science, Microelectronics, Electromagnetics, Power Systems, Signal Processing and Control Systems.
The paper on “2 Stages-Region-based P300 Speller in Brain-Computer Interface,” studies the use of P300 waves in brain-computer communication for higher classification accuracy. The P300 speller for the communication purpose is used for 2-stage classification, one that is region-based speller and another that is row-column based speller. Experiments are performed using subjects and the classification performance improvement with the use of 2-stages is described in the paper.
The next paper titled “A 1.8V 8.62μW Inverter-based Gain-Boosted OTA with 109.3dB dc Gain for SC Circuits,” presents the design of a low-power inverter-based gain-boosted operational-trans-conductance amplifier (OTA) for switched capacitor circuits. The design has been mapped to 180 nanometer CMOS technology. The salient features of the OTA design are its stability without the need of a compensating capacitor, offers enhanced slew rate and increased bandwidth for same capacitive load while requiring less power. Various performance parameters are analyzed in simulations and inferences are drawn in the paper.
The paper on “A Consumer-based Smart Home with Indoor Air Quality Monitoring System,” presents a system based on renewable energy source that monitors and controls the overall power consumption in a home and monitors oxygen level, temperature, humidity, and provides analysis of indoor air quality. The air quality monitoring system design aims for compactness, cost-effectiveness, energy efficiency as its design parameters. Its hardware implementation, placement of sensors and other aspects are analyzed and discussed in detail in this paper.
The next paper titled “A Hybridized Fuzzy-Neural Predictive Intelligent (HFNPI) Modelling Approach-based Underlap FinFET Model,” is about the design of accurate FinFET model for Nano-circuits. The paper uses fuzzy inference system and artificial neural network based optimization to determine the model parameters. The paper presents the model design and its parameter estimates and draws inferences therefrom.
In “An Improved Fuzzy K-Nearest Neighbor Algorithm for Imbalanced Data using Adaptive Approach,” the authors present method for accurately determining membership from imbalanced data. This is done by combining adaptive K-nearest neighbor approach to address the issue of imbalanced data followed by fuzzy K-nearest neighbor. The performance of the method is studied statistically on several imbalanced datasets and inferences are drawn from the study.
The paper on “Compact Unit-cell-based Semi-Fractal Antenna with Filtering Properties of Interference Bands Embedded with CBP Strips,” presents the design of a compact coplanar waveguide fed ultra wideband semi-fractal antenna having dual-band filtering characteristics. The design aims at specific wireless standards. The radiation pattern, gain characteristics and other performance parameters are presented from simulation studies and fabricated antenna.
The paper titled “Detection of Islanding and Fault Disturbances in Microgrid using Wavelet Packet Transform,” deals with the fast detection of islanding phenomena for effective operation and control in distributed generation distribution networks. Wavelet transform and wavelet packet transform methods are studied for this purpose and fault disturbance detection in micro-grids. The detection capability is analyzed for different noisy conditions in simulation environment and the results are presented.
The following paper “Frequency Estimation of Sinusoidal Signals Using ASIQ-Rife Interpolation Method,” presents a method for estimating the frequency of a sinusoid with trade-off between complexity and performance. It uses a method of automatic segmentation improved Quinn-Rife (ASIQ-Rife). The differences over classic Quinn and Rife methods are brought out through numerical studies.
The next paper titled “Joint Throughput Optimization for Multichannel Multiradio Multirate Wireless Network with Network Coding,” presents a network coding method to improve network throughput. Joint throughput optimization for network coding is studied for multi-rate multichannel multi-radio wireless network. The effect of packet loss on performance degradation is reduced with congestion control. The performance of the network coding method is studied using simulations and observations regarding optimality of performance are made.
In the paper “Model Order Reduction by using the Balanced Truncation Method and Factor Division Methods,” a method for model order reduction for linear dynamical systems is presented. Model order reduction aims to reduce the model complexity of systems while preserving essential characteristics with error tolerances. The numerator and denominator polynomials of a rational transfer function are reduced in a manner that guarantees stability and steady-state value of the original system. Examples of model order reduction are presented using the given method and compared with other methods from the literature.
The paper “Modeling of DC–DC Converter Using Exact-Feedback Linearization Method: A Discussion”, presents an overview of mathematical modelling of DC-DC converters operating in continuous conduction as well as discontinuous conduction modes using exact feedback linearization (EFL). DC-DC converters are essentially based on nonlinear dynamics. The frequency response of EFL model is compared with nonlinear model to bring out the efficacy of the linearization.
The next paper titled “Optimal Partial Aggregation based Energy Delay Compromise Technique for Wireless Sensor Network,” presents a partial aggregation technique to balance between energy consumption in a network and the delay. These are two important performance parameters of a wireless sensor network that are considered together for optimization in this paper. The proposed method is studied in simulations that bring out the efficacy of the energy consumption and delay parameters and is compared with other data aggregation techniques.
The paper “Takagi–Sugeno Fuzzy-based CNF Control Approach Considering a Class of Constrained Nonlinear Systems,” gives a method for the control of a class of constrained nonlinear systems. The parallel distributed compensation based composite nonlinear feedback control using Takagi-Sugeno fuzzy models presents certain useful properties related to stability and convergence time, that are discussed. The application of the model is studied for practical systems compared with other results from the literature, and inferences are drawn from the study.
Finally, the paper titled “Trellis-Coded Multilevel Coset Codes,” presents two multilevel Coset code designs that combine convolutional codes and set partitioning of binary linear block codes. The performance is compared in terms of bit error rates with convolutional codes having similar trellis complexity to bring out the efficacy of the designed codes.
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Shiban K Koul
Shiban K Koul is an Emeritus Professor at the Indian Institute of Technology, Delhi. Earlier, he served IIT Delhi as Deputy Director (Strategy and Planning) from 2012–2016. Currently, he is the Mentor Deputy Director (Strategy & Planning, International Affairs) at IIT Jammu. He served Astra Microwave Products Limited, Hyderabad as its Chairman from 2009–2019 and as Dr R P Shenoy Astra Microwave Chair Professor at IIT Delhi from 2014–2019. His research interests include: RF MEMS, High Frequency Wireless Communication, Microwave Engineering, Microwave Passive and Active Circuits, Device modeling, Millimeter wave IC Design and Reconfigurable Microwave Circuits including Antennas. He has completed 38 major sponsored projects, 52 consultancy projects and 60 technology development projects. He has authored 435 Papers, 9 state-of-the-art Books and 3 Book Chapters. He holds 10 patents and 6 copyrights. He is a Fellow of IEEE, INAE and IETE. He is the Chief Editor of IETE Journal of Research, Associate Editor of the International Journal of Microwave and Wireless Technologies, Cambridge University Press. He served as a Distinguished Microwave Lecturer of IEEE MTT-S for the period 2012–2014.
Recipient of numerous awards including IEEE MTT Society Distinguished Educator Award (2014); Teaching Excellence Award (2012) from IIT Delhi; Indian National Science Academy (INSA) Young Scientist Award (1986); Top Invention Award (1991) of the National Research Development Council for his contributions to the indigenous development of ferrite phase shifter technology; VASVIK Award (1994) for the development of Ka-band components and phase shifters; IETE Ram Lal Wadhwa Gold Medal (1995); Academic Excellence Award (1998) from Indian Government for his pioneering contributions to phase control modules for Rajendra Radar; Shri Om Prakash Bhasin Award (2009) in the field of Electronics and Information Technology; Teaching Excellence Award (2012) from IIT Delhi; VASVIK Award (2012) for the contributions made to the area of Information, Communication Technology (ICT) and M N Saha Memorial Award (2013) from IETE.