In this paper, a combination of Space-Time BlockCoding (STBC) and Discrete Fourier Transform (DFT) frequency coding for OFDMA systems is proposed which provides low computational complexity, low envelope fluctuations of the transmit signals at each transmit antenna and significant performance gains for transmission over mobile radio channels due to exploitation of spatial diversity. The resulti...

An enormous amount of images or videos are collected from laptops, mobiles, storage devices during the investigation by Police or intelligence agencies or digital forensic team. These collected images/videos to be analyzed to ascertain the source device that was used to capture these during the investigation. An every camera has its fingerprint in the form of Photo Response NonUniformity (PRNU)...

This paper presents an algorithm to estimate the parameters of two closely spaced sinusoids, providing a frequency resolution that is more than 800 times greater than that obtained by using the Discrete Fourier Transform (DFT). The strategy uses a highly optimized grid search approach to accurately estimate frequency, amplitude and phase of both sinusoids, keeping at the same time the computati...

A new technique is described for visualizing the subvalvular chamber of discrete membraneous subaortic stenosis. A Lehman ventriculography catheter is positioned so that its side holes lie within the chamber while its tip passes through the stenotic orifice into the body of the ventricle. A small amount of contrast injected directly into the subvalvular chamber outlines the membrane clearly. Du...

In ten normal subjects, we observed an initial hump in the aortic root echocardiogram after the onset of the QRS complex, following which a sharp anterior motion was noted. The onset of the anterior motion of the aortic root coincided with the onset of the upstroke of the aortic root pressure pulse and the onset of the velocity signal in five of seven patients with coronary arterial disease; in...

the hemodynamic findings in detail. The hemodynamic responses of such patients to various drugs have been studied in a number of laboratories.4 8 Angiographic studies have portrayed certain anatomic features of this disorder,9' 10 but recently the existence of the chamber obstruction has been questioned."' Although the anatomic features and physiological responses of the left ventricle in hyper...

Of 89 patients with idiopathic hypertrophic subaortic stenosis who had M-mode echocardiagrams recorded, seven patients with coexisting moderate to large pericardial effusions were identified. The clinical profile, M-mode echocardiograms, and cardiac catheterization and angiocardiographic studies in two of the seven patients were analyzed. That the two entities were not associated was suggested ...

This paper presents an evaluation of different image fusion techniques. There are many image fusion techniques which have been developed in a number of applications. Image fusion incorporates the data from several images of one scene to obtain an enlightening image which is more appropriate for human visual perception or additional vision processing. Image quality is closely connected to image ...

Main goal of steganography is to communicate securely in a completely undetectable manner. It is an art of hiding secret data in an innocently looking dummy container. In the Steganographic process, communication is masked to make the hidden message not discernible to the observer. Hidden message may be textual or image. In this paper, a novel image steganography method based on randomized bit ...

We have studied the optical properties of metallic nanoparticles with arbitrary shape. We performed theoretical calculations of the absorption, extinction and scattering efficiencies, which can be directly compared with experiments, using the Discrete Dipole Approximation (DDA). In this work, the main features in the optical spectra have been investigated depending of the geometry and size of t...