Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Sriram Kumar, D.S.

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    CAD tools for antennas
    (2008) Bhavatharini, S.; Raghavan, S.; Sriram Kumar, D.S.
    There are a number of CAD tools available in the market today for microwave designs. They enable the designer to try his hand at even very complex design very easily and quickly. They optimize MEMS designs prior to fabrication, which reduces prototype development cycle time and cuts manufacturing costs. This paper attempts to list a few of the popular CAD tools that are available in the market today and highlights on their special features that makes each tool unique. © 2008 IEEE.
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    Antenna gain determination using a microwave CAD tool-HFSS
    (2008) Bojja Venkatakrishnan, B.V.; Srivatsan, R.; Raghavan, S.; Sriram Kumar, D.S.
    Antennas have been increasingly studied in recent years. Different antennas have been designed for different applications based on the characteristics of the receiving side. Antennas cannot be fabricated as such and then be studied on. This leads to waste of material and requires a lot of iterations until we get the final design. In order to study the characteristics of an antenna without fabricating it, we need a special tool called a "SIMULATOR TOOL". It can determine all possible characteristics of an antenna under test. In this paper we'll be simulate few of the antennas using HFSS simulator tool. © 2008 IEEE.
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    Fading mitigation technique for MIMO in free space optical system
    (Institute of Electrical and Electronics Engineers Inc., 2016) Jeyaseelan, J.; Sriram Kumar, D.S.; Ramya, S.
    Free space optical (FSO) communications is the line of sight technology and its cost-effective and wide-bandwidth access technique for high data rates applications. In FSO system, the performance analysis over turbulence channels is limited, when using multiple apertures at both transmitter and receiver sides. Fading mitigation technique conditions is generalized to explore the ergodic capacity of multiple-input multiple-output (MIMO) system. The gamma-gamma distribution is used to analyze the fluctuations of the irradiance of optical channels distorted by atmospheric conditions. To evaluate the receiver performance analytically, we use an α-μ distribution to efficiently approximate probability density function (PDF) of the sum of independent and identical distributed ET RVs through moment-based estimators. The sum of independent and but not necessarily identically distributed RVs is used to efficiently approximate PDF of Distribution. High signal to noise ratio is achieved for fading scheme to get insights into impact of system and channel parameter on ergodic capacity. Monte-carlo simulations is validated in our proposed results. © 2015 IEEE.