Vellore Institute of Technology (VIT) is a private university located in&nbsp;Tamil Nadu, India. Founded in 1984, as Vellore Engineering College, the institution offers 20 undergraduate, 34 postgraduate, four integrated and four research programs. It has campuses in Vellore, Amravati, Bhopal and Chennai.

VIT is one of the top ranked private universities in India according to NIRF, THE and QS Rankings.&nbsp;Govt. of India has recognized&nbsp;VIT, Vellore as an&nbsp;Institution of Eminence. This has allowed VIT to take independent quality initiatives and move up in world ranking.

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VIT University

Department of Communication Engineering

VIT Unitversity

School of Electronics Engineering

Vellore Campus

BioNanoScience

Investigating the Antimicrobial Activities of the Biosynthesized Selenium Nanoparticles and Its Statistical Analysis

Wireless smart sensor networks (WSSNs) are emerging as the physical backbone of the internet of things (IoT) technology. On the basis of the IoT platform, web-based systems and services are been developing such as e-surveillance, industrial-IoT, and precision agriculture. For farmland monitoring systems, WSSNs need to be scalable in terms of coverage area. Sensor nodes are energy-constrained devices, and hence, many energy-efficient clustering protocols are developed in the literature. But these methods overload the cluster leaders (CLs) with cluster computation and data communication costs. An improper CL selection may lead to the early death of such nodes and hence does not prolong the network lifetime stability. We propose a fuzzy logic (FL)–based distributed clustering protocol to enhance the energy efficiency of WSSN while maximizing the coverage area. The load of CLs is shared by originators and super-CLs (SCLs) selected in the network. The wireless link and received signal strength (RSS) are greatly affected by environmental conditions and thus cannot be considered as ideal network parameters. We use FL systems to tackle the uncertainty of such network parameters. The proposed protocol is simulated for different scalable WSSNs. The results indicate that the proposed protocol provides better lifetime stability than the recent conventional protocols. The functionalities of the protocol are proposed considering the recent wireless standards. Hence, the proposed protocol can be suitably implemented for farmland monitoring systems. © 2019 John Wiley &amp; Sons, Ltd.

International Journal of Communication Systems

Fuzzy logic-based distributed clustering protocol to improve energy efficiency and stability of wireless smart sensor networks for farmland monitoring systems

The Polynomial EVD (PEVD) was developed to achieve broadband subspace decomposition as a part of two-stage convolutive Blind Source Separation (BSS) algorithm. It has the ability to accomplish strong (total) decorrelation and spectral majorization on convolutive signals. We explore different algorithms for constructing FIR paraunitary (PU) matrices with the aim of performing broadband subspace decomposition. We adopt a set of new iterative PEVD algorithms for this task: a) Sequential matrix diagonalization (SMD) b) Maximum element sequential matrix diagonalization (ME-SMD). We also present a procedure to find out the total number of source signals in the convolved data, without having prior knowledge, based on the energy of individual polynomial eigen values. This helps us to find out exact signal and noise subspaces. To measure the performance of PEVD for broadband subspace decomposition, we use the diagonalization performance measure and subspace estimation measure. We present the results both for simulated data and for actual convolved speech data in the presence of noisy environment to show the effectiveness of the adopted algorithms over existing SBR2/SBR2C algorithms in the literature. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

Multimedia Tools and Applications

Broadband subspace decomposition of convoluted speech data using polynomial EVD algorithms

This paper studies the achievable total throughput of an energy harvesting cooperative cognitive radio (CR) network.A CR transmitter cooperates with a primary user (PU) transmission if PU is found to be present in the given channel while it transmits its own data in the absence of PU. The CR transmitter is an energy harvesting node which harvests simultaneously from non-RF signal as well as RF signal of PU. The CR transmitter uses the harvested energy on shared basis for cooperation and transmission. The same study is also extended for cooperation of multiple CRs in multiple PU band scenario. In cooperation in muti-band scenario, all CRs sense all PU channels and sensing informations are fused at fusion centre to know about the status of PU.Performance is investigated in terms of total network throughput for several parameters such as sensing time, energy splitting parameter, and energy allocation ratio etc. Novel analytical expressions for total useful throughput and optimal energy allocation ratio parameter under the considered network scenario are developed. Useful throughput and optimal energy allocation ratio parameter are also estimated for a target secondary network (CR network) throughput under a quality of service constraint of PU such as collision probability. It is observed that the value of optimal energy allocation parameter gets reduced if the number of CRs in cooperation increases or the number of PU channels increases. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.

World University root node

Wireless Networks

Allocation of optimal energy in an energy-harvesting cooperative multi-band cognitive radio network

Journal of Natural Fibers

Characterization of microfiber isolated from Hibiscus sabdariffa var. altissima fiber by steam explosion

Fulltext

Digital Communications and Networks

Design and analysis of multi-channel drop filter using dual L defected hexagonal photonic crystal ring resonator

One of the most attractive and challenging areas in the upcoming next-generation 5G wirelessnetworkistheverticalhandover(VHO).Recently,manyoftheheterogeneous wireless communication technologies are introduced to satisfy the demands of users in all situations. Due to the deployment of heterogeneous networks, the users can access the internet anywhere, anytime through different wireless networks. To obtain seamless service and service continuity, the device should be handed over to the best wireless networks. Here, a half handover scheme for Device-to-Device (D2D) communication is implemented for the selection of the best network. The target network selection for vertical handover can be handled using multiple attribute decision making (MADM) methods. An intelligent and fast vertical handover decision is much needed, which should be reliable even for random and uncertain environments. Fuzzy logic is proved to be effective in handling imprecise data. Hence, in this work, the impact of combining fuzzy with the conventional MADM scheme, simple additive weighting(SAW)isanalyzedandthehybridschemeiscomparedwiththeconventional MADM schemes like SAW, Techniques for order preference by similarity to ideal solution (TOPSIS), VlseKriterijumska optimizacija I Kompromisno Resenje (VIKOR) in terms of handover decision delay. Since, the numbers of handovers executed are low,thehandoverdecisiondelayperformanceoftheproposedschemeissuperiorthan the considered classical MADM schemes.

Indonesian Journal of Electrical Engineering and Computer Science

A fuzzy based vertical handover network selection scheme for device-to-device communication

In this article, a single-feed, miniaturized, circularly polarized (CP) microstrip patch antenna (MPA) using Koch fractal geometry for RFID applications is presented. The design consists of a probe-fed slotted square-shaped patch with the fractal edge and two pairs of capacitively coupled grounded metal strips. The proposed design methodology is validated by designing two prototypes (Antenna 1 and Antenna 2), which are operating at 2.435 GHz and 5.78 GHz respectively. Both antennas show right-hand circular polarization (RHCP) characteristics with 3 dB axial ratio bandwidth (ARBW) covering 2.433–2.439 GHz and 5.75–5.8 GHz respectively. This design leads to a reduction in the overall size of the antennas, to meet the demands of portable wireless devices. © 2020 Elsevier GmbH

AEU - International Journal of Electronics and Communications

Design and modelling of a compact circularly polarized antenna for RFID applications

In wireless body area network (WBAN) the data gets corrupted during transmission and reception due to noises and inter-WBAN interference. WBAN must support the combination of low energy consumption and high reliability, but powerful encryption code increase the processing energy consumption of the receiver. So there is a trade-off between the transmitter and the processing energy consumption in the network. For e-health monitoring in WBAN systems transmission of body signals must be fast to ensure immediate diagnosis and health assistance. This requires a high power and energy efficient lightweight codes to reduce the power consumption to enhance the network lifeline. © 2020 SERSC.

International Journal of Advanced Science and Technology

Design and implementation of lightweight encryption algorithm for WBAN

This communication presents the design of a compact loop antenna with independent frequency tuning. The proposed antenna consists of a feed line fed by a 50Ω coaxial probe and four resonating arms on the adjacent sides of the feed line. The two outer resonating arms are directly coupled to the feed line and the other two inner resonating arms are coupled to the outer arms. The proposed antenna has a footprint of 25 mm × 10 mm ×0.2 mm. The designed antenna operates at 0.9, 2.4, 3.5, and 5.5 GHz. Each of these bands is individually tuned using varactor diodes. Thus, the aggregation of these tunable bands provides wide bandwidth. The impedance bandwidth and percentage bandwidth of the antenna are 270/1000/400/700 MHz and 33%/47.6%/11%/12.7%, respectively. Furthermore, the gain and efficiency of the antenna are 1.7/1.3/2.1/2 dBi and 60%/63%/65%/69%, respectively. The prototype antenna is fabricated and tested. The measured impedance and radiation characteristics of the antenna are in good correlation with the simulation results. © 1963-2012 IEEE.