S. K. Sudheer

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In this paper, performance of cooperative spectrum sensing (CSS) has been assessed in the presence of Rayleigh fading. Cognitive radio (CR) users which employ improved energy detectors (IEDs) are censored depending on the quality of radio channels between them and a fusion center (FC). A training based channel estimator is used at the FC to estimate the(More)
As a rule, a video signal has high temporal redundancies due to the high correlation between successive frames. This redundancy has not been deflated enough by current video compression techniques. In this paper, we present a new video compression technique which tends to hard exploit the relevant temporal redundancy in the video to improve solidity(More)
The LHC magnet tests operation team developed various innovative techniques, particularly since early 2004, to complete the superconductor magnet tests by Feb. 2007. Overall and cryogenic priority handling, rapid on-bench thermal cycling, rule-based goodness evaluation on round-the-clock basis, multiple, mashed web systems are some of these techniques(More)
This paper proposes a modified and simple method for high capacity Steganography in case of color images. This algorithm is usually based on wavelet fusion technique which was not attempted for color images and it proves to be a simplest method than other techniques or algorithms for color images. Even though it uses transform domain technique which only(More)
Unregistered fishing boats and those displaying fake registration numbers is being used for criminal activities in the coastal areas. Recent terrorist attacks in Mumbai and the warnings from the intelligence agencies necessitate tamper-proof Holographic Registration Plates with GPRS (HRPG) networking system on all sea going vessels to augment the coastal(More)
In the present investigation we have proposed a solid core photonic crystal fiber (PCF) with octagonal ring structured cladding. In order to compare, two cases has been obtained with different air filling ratio and filled with high refractive index material. Different optical parameters of the photonic crystal fiber like effective area, Nonlinear(More)
Silver/tungsten oxide multi-layer films are deposited over quartz substrates by RF magnetron sputtering technique and the films are annealed at temperatures 200, 400 and 600°C. The effect of thermal annealing on the phase evolution of silver tungstate phase in Ag/WO3 films is studied extensively using techniques like X-ray diffraction, micro-Raman analysis,(More)
Photonic Crystal Fibers (PCFs) are a new class of optical waveguides which offer exceptional light guiding mechanism and deliver significantly improved performance compared to conventional optical fibers. In the present investigation, we propose an solid core PCF for three different values of air filling fraction. The proposed PCF is simulated by using(More)
Here, we designed a highly nonlinear and low loss Photonic Crystal Fiber (PCF) structure with square lattice using COMSOL multiphysics. Propagation properties of proposed PCF has been analysed. The analysis has been carried out using finite element method. The proposed fiber obtained low confinement loss, minimum dispersion for wide range of wavelength.(More)
We investigate a linear light propagation mechanism in the photonic crystal fibers infiltrated with nematic liquid crystals which is used for Radio over Fiber (ROF) applications. PCF core region consists of soft glass and has nematic liquid crystal filled holes in the cladding region. Using the designed hexagonal solid core liquid crystal PCF, the(More)