Entity

Time filter

Source Type

New Delhi, India

Bharat Sanchar Nigam Limited is an Indian state-owned telecommunications company headquartered in New Delhi, India. It was incorporated on 15 September 2000 and took over the business of providing of telecom services and network management from the erstwhile Central Government Departments of Telecom Services and Telecom Operations , with effect from 1 October 2000 on a going concern basis. It is the largest provider of fixed telephony, largest broadband services provider with more than 60% Market share, and fourth largest mobile telephony provider in India. However, in recent years the company's revenues and market share have plummeted into heavy losses due to intense competition in the Indian telecommunications sector.BSNL is India's oldest and largest communication service provider . It had a customer base of 117 million as of January 2014. It has footprints throughout India except for the metropolitan cities of Mumbai and New Delhi, which are managed by Mahanagar Telephone Nigam . Wikipedia.


Audhya G.K.,Bharat Sanchar Nigam | Sinha K.,Honeywell | Ghosh S.C.,Indian Statistical Institute | Sinha B.P.,Indian Statistical Institute
Wireless Communications and Mobile Computing | Year: 2011

Efficient allocation of channels for wireless communication in different network scenarios has become an extremely important topic of recent research. The main challenge lies in the fact that the channel allocation problem is NP-complete. Because of a maximum allowable time limit imposed in practical situations for allocation of channels, sometimes we may need to be satisfied with a near-optimal solution. In this correspondence, we present a discussion on the various challenges and approaches that have been used by different researchers to solve the problem of channel allocation taking into account different interference issues and efficient utilization of available communication channels for cellular mobile (including multimedia communication) environment and cognitive radio based networks. Copyright © 2010 John Wiley & Sons, Ltd. Efficient allocation of channels for wireless communication in different network scenarios has become an extremely important topic of recent research. The primary difficulty arises from the fact that the channel allocation problem is NP-complete. In this paper, we describe the challenges involved and also present a survey of the different approaches that have been adopted to solve the problem, taking into account different interference issues and efficient utilization of available communication channels for cellular mobile (including multimedia communication) environments and cognitive radio based networks. Copyright © 2010 John Wiley & Sons, Ltd. Source


Singh R.K.,Bharat Sanchar Nigam
Indian Journal of Radio and Space Physics | Year: 2012

There is a strong perception relating to existence of a high level of non-ionizing electromagnetic radiation in the vicinity of base station antennas. In the present paper, electromagnetic radiation from base station antennas installed for various wireless communication purposes has been investigated based on equivalent isotropically radiated power calculations. For this purpose, a typical wireless communication site has been selected where GSM, CDMA, 3G/UMTS, and WiMAX antennas are installed. The overall ratio of equivalent isotropically radiated power (EIRP) and threshold EIRP combining all services at this particular site has been calculated at ground level and nearby buildings. It has been found that the ratio of EIRP and threshold EIRP is less than unity and thus, the particular site is normally compliant and does not impose any adverse health effects. For general public, the exclusion zone (compliance distance) from GSM, CDMA, 3G/UMTS, and WiMAX antennas have been found at 7.30, 6.076, 7.436, and 6.861 m, respectively. Source


Sharma S.K.,Bharat Sanchar Nigam | Rattan M.,Guru Nanak Institutions
IETE Journal of Research | Year: 2010

This paper presents the investigations of various broad banding and minimization techniques for square patch antenna. For bandwidth enhancement, square patch antenna with U shaped slot and L probe feed have been considered. Using these techniques, bandwidth in the range of 30 - 40% has been achieved. In addition to this, techniques to minimize patch antenna′s surface area have also been analyzed. The shorting pin and shorting wall methods have been used for minimization. Simulation has been carried out using IE3D software. Copyright © 2010 by the IETE. Source


Singh R.K.,Bharat Sanchar Nigam | Singh R.K.,Banaras Hindu University
International Journal of Applied Electromagnetics and Mechanics | Year: 2012

A self-consistent nonlinear simulation model has been presented to analyze the nonlinear behaviour of a gyro-TWT amplifier. It employs a slow-time scale formulation such that the numerical calculation time and the number of numerical integration steps have been drastically reduced. Beam-wave interaction mechanism has been presented with the help of electron flight diagram. The effect of variation of the static magnetic field on the bunching of the electrons along axial direction has also been clearly presented. The electron flight diagram thus obtained clearly demonstrates the electron defocusing and its effect on the saturation behaviour of the device. © 2012 IOS Press and the authors. All rights reserved. Source


Dheeba J.,Noorul Islam Center for Higher Education | Albert Singh N.,Bharat Sanchar Nigam | Tamil Selvi S.,National Engineering College
Journal of Biomedical Informatics | Year: 2014

Breast cancer is the second leading cause of cancer death in women. Accurate early detection can effectively reduce the mortality rate caused by breast cancer. Masses and microcalcification clusters are an important early signs of breast cancer. However, it is often difficult to distinguish abnormalities from normal breast tissues because of their subtle appearance and ambiguous margins. Computer aided diagnosis (CAD) helps the radiologist in detecting the abnormalities in an efficient way. This paper investigates a new classification approach for detection of breast abnormalities in digital mammograms using Particle Swarm Optimized Wavelet Neural Network (PSOWNN). The proposed abnormality detection algorithm is based on extracting Laws Texture Energy Measures from the mammograms and classifying the suspicious regions by applying a pattern classifier. The method is applied to real clinical database of 216 mammograms collected from mammogram screening centers. The detection performance of the CAD system is analyzed using Receiver Operating Characteristic (ROC) curve. This curve indicates the trade-offs between sensitivity and specificity that is available from a diagnostic system, and thus describes the inherent discrimination capacity of the proposed system. The result shows that the area under the ROC curve of the proposed algorithm is 0.96853 with a sensitivity 94.167% of and specificity of 92.105%. © 2014. Source

Discover hidden collaborations