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Search Results: 1 - 10 of 8011 matches for " Anindya Sundar Das "
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Design of RS (255, 251) Encoder and Decoder in FPGA
Anindya Sundar Das,,Satyajit Das,Jaydeb Bhaumik
International Journal of Soft Computing & Engineering , 2013,
Abstract: Detection and correction of errors in digital data is an important issue for the modern communication systems. Therefore an efficient error control code is needed to protect the digital data. In high speed communication system Reed-Solomon codes are widely used to provide error protection especially against the burst errors. Reed-Solomon codes are cyclic, non-binary codes. In this paper RS(255, 251)encoder and decoder have been designed and implemented on an FPGA platform.
Architecture for Programmable Generator Polynomial Based Reed-Solomon Encoder and Decoder
Jaydeb Bhaumik,Anindya Sundar Das,Jagannath Samanta
International Journal of Soft Computing & Engineering , 2013,
Abstract: Reed-Solomon Codes are popularly used for error correction in many applications like storage devices (CD, DVD), wireless communications, high speed modems and satellite communications. In this paper, a modified scheme for programmable generator polynomial based Reed-Solomon encoder and decoder has been proposed. The works reported in this paper corrects errors in derived equations and decoder architecture proposed by Shayan et al. Moreover, modified architectures for programmable generator polynomial based Reed-Solomon encoder and decoder are reported.
A Novel Radio over Fiber System for Long Haul Single-Mode-Fiber Transmission
Ardhendu Sekhar Patra,Anindya Sundar Das,Banibrata Bag,Akinchan Das
International Journal of Soft Computing & Engineering , 2013,
Abstract: We have proposed and demonstrated a novel architecture of a radio over fiber (RoF) system in this paper. In this downlink system, the base band data signals are carried by the optical millimeter-wave generated at the central station and converted to the electrical RF signal by a converter at the base station before we distribute them through antenna. Here we generate and transmit the optical millimeter-wave by using external modulation technique and carrier suppression method. The performance is investigated by the good eye diagram and the significantly low BER at different lengths of the single mode fiber (SMF).
Error-Correcting Functional Index Codes, Generalized Exclusive Laws and Graph Coloring
Anindya Gupta,B. Sundar Rajan
Mathematics , 2015,
Abstract: We consider the \emph{functional index coding problem} over an error-free broadcast network in which a source generates a set of messages and there are multiple receivers, each holding a set of functions of source messages in its cache, called the \emph{Has-set}, and demands to know another set of functions of messages, called the \emph{Want-set}. Cognizant of the receivers' \emph{Has-sets}, the source aims to satisfy the demands of each receiver by making coded transmissions, called a \emph{functional index code}. The objective is to minimize the number of such transmissions required. The restriction a receiver's demands pose on the code is represented via a constraint called the \emph{generalized exclusive law} and obtain a code using the \emph{confusion graph} constructed using these constraints. Bounds on the size of an optimal code based on the parameters of the confusion graph are presented. Next, we consider the case of erroneous transmissions and provide a necessary and sufficient condition that an FIC must satisfy for correct decoding of desired functions at each receiver and obtain a lower bound on the length of an error-correcting FIC.
Decoding Network Codes using the Sum-Product Algorithm
Anindya Gupta,B. Sundar Rajan
Mathematics , 2015,
Abstract: While feasibility and obtaining a solution of a given network coding problem are well studied, the decoding procedure and complexity have not garnered much attention. We consider the decoding problem in a network wherein the sources generate multiple messages and the sink nodes demand some or all of the source messages. We consider both linear and non-linear network codes over a finite field and propose to use the sum-product (SP) algorithm over Boolean semiring for decoding at the sink nodes in order to reduce the computational complexity. We use traceback to further lower the computational complexity incurred by SP decoding. We also define and identify a sufficient condition for fast decodability of a network code at a sink that demands all the source messages.
FEM Simulation and Experimental Validation of Cold Forging Behavior of LM6 Base Metal Matrix Composites  [PDF]
Hillol Joardar, Goutam Sutradhar, Nitai Sundar Das
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.1110100
Abstract: The present paper examines the deformation behavior of solid cylinders of an aluminium alloy metal matrix composite (MMC) undergoing axial compression in a Universal Testing Machine under dry condition. The composite was pre- pared by the stir casting method from LM6 aluminium alloy using silicon carbide particles (SiC) as reinforcing agent. The effect of weight percentage of silicon carbide on microstructure, hardness and upsetting load is studied. The friction factor at die metal interface is evaluated by ring compression tests and its effect on non-uniform deformation is investi- gated. The experimental results are finally compared with those obtained by FEM simulation.
Many-body approach to low-lying collective excitations in a BEC approaching collapse
Anindya Biswas,Tapan Kumar Das
Physics , 2008, DOI: 10.1088/0953-4075/41/23/231001
Abstract: An approximate many-body theory incorporating two-body correlations has been employed to calculate low-lying collective multipole frequencies in a Bose-Einstein condensate containing $A$ bosons, for different values of the interaction parameter $\lambda=\frac{Aa_{s}}{a_{ho}}$. Significant difference from the variational estimate of the Gross-Pitaevskii equation has been found near the collapse region. This is attributed to two-body correlations and finite range attraction of the realistic interatomic interaction. A large deviation from the hydrodynamic model is also seen for the second monopole breathing mode and the quadrupole mode for large positive $\lambda$.
DIRECT DIGITAL FREQUENCY SYNTHESIZER DESIGN WITH MODIFIED PARABOLIC METHOD
Snigdha Madhab Ghosh,Anindya Sundar Dhar,Sunandan Bhunia
International Journal of Soft Computing & Engineering , 2012,
Abstract: The efficiency of the traditional DDFS is greatly depends on the large size of memory. The ROM less architecture for generating sine wave and its necessary corrective measure based on parabola has already been developed. This paper proposes a modified parabola by adding a triangular wave to achieve a sine wave with less distortion. This architecture gives better performance.
Kolkata Paise Restaurant Problem in Some Uniform Learning Strategy Limits
Asim Ghosh,Anindya Sundar Chakrabarti,Bikas K. Chakrabarti
Computer Science , 2009,
Abstract: We study the dynamics of some uniform learning strategy limits or a probabilistic version of the "Kolkata Paise Restaurant" problem, where N agents choose among N equally priced but differently ranked restaurants every evening such that each agent can get dinner in the best possible ranked restaurant (each serving only one customer and the rest arriving there going without dinner that evening). We consider the learning to be uniform among the agents and assume that each follow the same probabilistic strategy dependent on the information of the past successes in the game. The numerical results for utilization of the restaurants in some limiting cases are analytically examined.
Rapid green synthesis of silver nanoparticles from silver nitrate by a homeopathic mother tincture Phytolacca Decandra
Soumya Sundar Bhattacharyya,Jayeeta Das
Zhong Xi Yi Jie He Xue Bao , 2012,
Abstract: OBJECTIVE: To examine if a homeopathic mother tincture (Phytolacca Decandra) is capable of precipitating silver nanoparticles from silver nitrate (AgNO3) and to characterize the biosynthesized nanoparticles for evaluating their biological activities.METHODS: A total of 100 mg of AgNO3 was added to 20 mL of Milli-Q water and stirred vigorously. Then 5 mL of the homeopathic mother tincture of Phytolacca Decandra (ethanolic root extract of Phytolacca decandra) was added and stirred continuously. Reduction took place rapidly at 300 K and completed in 10 min as shown by stable light greenish-yellow color of the solution which gave colloid of silver nanoparticles. The colloid solution was then centrifuged at 5 000×g to separate the nanoparticles for further use. The nanoparticles were characterized by spectroscopic analysis, particle size analysis and zeta potential measurements, and morphology was analyzed by atomic force microscopy. The drug-DNA interaction was determined by circular dichroism spectrophotometry and melting temperature profiles by using calf thymus DNA as the target. The biological activities were determined using a cancer cell line A549 in vitro and using bacteria Escherichia coli and fungus Saccharomyces cerevisiae as test models.RESULTS: Phytolacca Decandra precipitated silver nanoparticles in ambient conditions. The nanoparticles had 91 nm particle size, with polydispersity index of 0.119 and zeta potential of -15.6 mV. The silver nanoparticles showed anticancer and antibacterial properties, but no clear antifungal properties.CONCLUSION: This could be a novel environment-friendly method to biosynthesize silver nanoparticles using a cost-effective, nontoxic manner. The homeopathic mother tincture may utilize this property of nano-precipitation in curing diseases or disease symptoms.
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