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This paper describes the results of the investigation of nonlinear propagation of short optical pulses in a photonic crystal fibers. It has been observed that nonlinear intensity-dependent effect can be used to determine the transmission and rejection of propagating pulses. The optical switching is achieved using Kerr nonlinear effect to shift the band gap in the Photonic crystal fiber. It is found...
Device-to-Device (D2D)-communication is a promising way to improve area spectral efficiency (ASE), energy efficiency (EE) and mitigate traffic load of base station (BS). In this paper, received signal strength (RSS)-threshold approach is presented to analyze ASE and EE of D2D users in cellular networks. A mobile user equipment (UE) will choose to work in cellular mode only if RSS from nearest BS is...
Wireless Sensor Networks with mobile nodes are being used in various applications nowadays. Sensor deployment affects the usability and efficiency of these networks. Deployment strategies work to maximize coverage while minimizing number of sensors and cost of deployment. In this paper, three geometrical grids (rhombus, hexagonal and square) based deployment strategies have been simulated and analyzed...
The present paper proposes a method in which a multiuser system with different receivers having different Field of view (FOV) has been used to reduce channel correlation in visible light communication (VLC), which will be helpful for signal separation at the user terminal. FOV of receivers would be different at different room location based on RMS delay of reflected light from walls. In the simulation,...
the paper presents a cognitive radio networks which proposes a novel method of channel assessment analysis with dynamic channel allocation with the help of priority scheduling and improvement in data transmission. The paper first deals with the selection of a novel approach to sense the available spectrum in the area and then simulate a co-operative spectrum sensing system. The co-operative spectrum...
A Wireless Body Area Network (WBAN) is a network of wireless sensors and medical equipments located inside or outside the human body for collecting biological signals for various medical and non-medical applications. IEEE 802.15.6 was developed as the standard for WBAN where nodes can access the channel via contention access or contention free access. In this paper, only contention access is considered...
This paper presents a multiband, metamaterial loaded microstrip patch antenna. Closed C-shaped slot has been used to miniaturize both mushroom type electromagnetic bandgap structures and microstrip antenna. Bandgap of microstrip antenna has been shifted to 5.5 GHz from 6.5 GHz using Closed C slot. This bandgap structure, when used as a substrate of patch antenna, results in multiband operation due...
A comparative study of Gallium Arsenide (GaAs), a semiconductor materials more suitable than Silicon for high frequency circuits has been presented in this paper. A Yagi-Uda antenna, intended to work on millimeter wave integrated circuit is designed using both silicon and Gallium-Arsenide (GaAs) and the results have been compared. The designed antenna is suitable for on-chip application on millimeter...
Amplitude shift keying (ASK), Frequency shift keying (FSK) and Phase Shift keying (PSK) are important digital modulation techniques. To generate these types of modulation various circuits are available. A new simple circuit for generating amplitude shift keying, frequency-shift keying & phase-shift keying waves using sample & hold IC LF 398 is given. Simulation results which confirm the validity...
The exponential growth of the mobile users in ubiquitous manner has made it a timely need to attain increased capacity, higher data rate and decreased latency for better quality of service. This has led to the extensive research efforts towards the development of next generation wireless networks i.e. 5G. In this paper, we begin with the description of the salient features, requirements and potential...
This paper presents the physical implementation of an antenna system for 4-by-4 MIMO communication. Considering the size of the typical antenna for LTE-band wireless communication, it is very difficult to increase the number of the radiators more than two and integrate them in a limited volume of the smart phone. To circumvent this difficulty, compact radiators are designed based on the zeroth-order...
The aim of this manuscript is to propose a secure handoff scheme for cognitive radio network by ensuring a secure communication among cognitive users (CU). A coordinator cognitive user(CCU) is selected based on users trust values/factor (TV/TF) by periodically computing and updating these values of each CU depending upon their characteristics. The CCU is the controlling unit to allow the unused band/channel...
Statistical characteristics of radio waves scattered in the turbulent ionospheric plasma are investigated analytically by modify perturbation method taking into account both polarization coefficients and diffraction effects of both ordinary and extraordinary waves. Numerical investigations are carried out for anisotropic Gaussian correlation function containing anisotropy coefficient and the angle...
Nature-inspired approaches are powerful methods to solve many tough optimization problems. This paper proposes the two optimization approaches named, Big bang-big crunch and Firefly optimization algorithm to solve the optical channel-allocation problem in the optical wavelength division multiplexing systems by using the optimal Golomb ruler sequences. The simulation results conclude that both approaches...
In this paper, a novel approach of an extracted LC model of monopole antenna with T-slot at ground plane for ultra wide band application is proposed. For extraction of LC model, 50Ω matching between dielectric component and semi conducting at ground plane where T-slot is embedded is done. The monopole with T-slot antenna achieves wide band of 2.1GHz to 11GHz while extracted LC model is 2.1GHz to 10...
This research presents a novel approach to improving power consumption in a coherent optical network. The rationale of this paper is to examine a method of reutilizing an optical carrier wave at the receiving end of a transport system. This method provides a means to save energy associated with the creation of the carrier wave for the purpose of data transmission at the distant end. In this embodiment,...
Ultra-Wide Band (UWB) antenna with band notch possessions by means of artificial materials is suggested. This methodology makes use of uniplanar Electromagnetic Band Gap (EBG) structure that is capacitively attached to antenna feed to accomplish band-notched designs. One of the compulsory features of uniplanar EBG structures is elimination of perpendicular vias, thus simplifying fabrication method...
This paper describes a single amplify-and-forward relay assisted multiple user-pair free space optical (FSO) communication system. It is assumed a line-of-sight link does not exist between the nodes of a user-pair and the communication link between them is established using a relay. Among the multiple user-pairs, the user-pair having the maximum instantaneous signal-to-noise ratio is selected by the...
Microstrip patch antenna in wireless communication is gaining importance as powerful technological trend. This paper presents design and simulation of a dielectric coated rectangular microstrip patch array antenna conformed to the cylindrical surface for many wireless applications. The conformal rectangular microstrip patch antenna array is analyzed using HFSS and also made a comparison by varying...
Bandwidth pressure on Ethernet has increased recently because of 3G, 4G, Wi-Fi standards applied to smart phones, tablets, Internet protocol television, social media, gaming etc. Due to above network industries are forced to standardize 100, 400 gigabit Ethernet speeds presently and Terabit Ethernet speeds in near future. According to Moore's law the network bandwidth is doubling every 18 months,...
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