National Institute of Technology, Meghalaya

About: National Institute of Technology, Meghalaya is a education organization based out in Shillong, India. It is known for research contribution in the topics: Control theory & Electric power system. The organization has 503 authors who have published 1062 publications receiving 6818 citations. The organization is also known as: NIT Meghalaya & NITM.

A Low-Power Split-Controlled Single Ended Storage Content Addressable Memory

Abstract: Content addressable memory (CAM) is a hardware search engine used for high speed searching/accessing. The utilization of CAM is still constrained in some applications by large power dissipation. Especially, the search approach contributes more power in overall power dissipation. This paper proposes a low-power CAM cell using split-controlled single ended storage (SCSES) technique to achieve energy-efficient hardware search engine. A 64×32-bit CAM array is designed using GPDK 45-nm CMOS technology and the post-layout simulations are performed in SPECTRE simulator to verify the power efficiency. The proposed design can achieve search result in 0.558 ns with energy efficiency of 0.83 fJ/bit/search at 1.0 V.

Rectangular microstrip antenna with cross headed dumbbell defected patch surface for improved polarization purity

Abstract: A simple and compact rectangular microstrip antenna with cross headed dumbbell defected patch surface is proposed for noteworthy suppression of cross polarized (XP) radiation, eliminating higher order orthogonal resonance without altering its dominant mode field configuration. The proposed antenna has been studied experimentally with theoretical justifications. More than 28 dB of XP radiation isolation from peak co polarized (CP) radiation is revealed.

Design and Control of A Switched-Diode Multilevel Inverter for Photovoltaic Application

Abstract: Extensive renewable power generation growth has increased the research effort in power converter technology. To improve the power quality in such applications, it is desirable to interface the system with multilevel inverter (MLI) instead of traditional two/three-level inverters. The conventional MLIs however need isolated dc sources with higher switch count. To address this issue, this paper presents a novel reduced switch switched-diode module MLI (SDM MLI). The proposed SDM MLI is designed using n basic repeating units and a half-bridge module. This module enables the MLI to produce 4n+5 voltage levels instead of 2n+3 at the output. In view of switch count, source count, blocking voltage, loss, and design cost, the MLI topologies are compared. Selective harmonic elimination (SHE) technique is used to control the proposed seventeen-level SDM MLI. MATLAB/SIMULINK platform is used for extensive simulation of the SDM MLI in dynamic environment. Furthermore, under different modulation indices, change in frequency and load dynamic conditions, the theoretical and simulated findings are validated experimentally on a prototype developed in the laboratory.

Nonidentical Chaotic Secure Communication Using Proportional Integral Sliding Mode Control Technique

Abstract: This paper puts forward a secure communication scheme based on synchronisation between nonidentical (topologically non-equivalent) chaotic systems using sliding mode control (SMC) technique. A drive-response philosophy is used where one chaotic system is known as a transmitter and other chaotic system with controller is termed as a receiver. Lu chaotic system is considered as a drive system and Bhalekar-Gejji (BG) chaotic system is considered as a response system. Proportional integral (PI) sliding surfaces are designed to achieve synchronisation between nonidentical chaotic systems to achieve secure communication. Sliding mode control law is designed to ensure the system trajectories to the designed sliding surfaces. Required asymptotic stability condition is derived using Lyapunov stability theory. MATLAB simulation environment is used for numerical simulation of the proposed communication scheme. Simulation results reveal the successful achievement of the proposed nonidentical chaotic systems synchronisation based concept to secure communication.