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\indent\indent With immense pleasure and a deep sense of gratitude, I wish to express my sincere thanks to my supervisor {\bf Dr. Suchetha M}, Associate Professor, School of Electronics Engineering, Vellore Institute of Technology(VIT), Chennai without her motivation and continuous encouragement, this research would not have been successfully completed.

\indent\indent I am grateful to the Chancellor of VIT, {\bf Dr. G.Viswanathan}, the Vice Presidents, the Vice Chancellor for motivating me to carry out research in the Vellore Institute of Technology and also for providing me with infrastructural facilities and many other resources needed for my research.

\indent\indent I express my sincere thanks to {\bf Dr. Susan Elias}, Dean, School of Electronics Engineering, Vellore Institute of Technology, Chennai  for his kind words of support and encouragement. I like to acknowledge the support rendered by {\bf my colleagues} in several ways throughout my research work.

\indent\indent I wish to extend my profound sense of gratitude to my friend {\bf Venkata Chaitanya Reddy Chappidi} being there for me, and being such an amazing friend.  I can never go wrong in life because I have your support. You have always been there, offered me wisdom, and encouraged me during my research and also providing me with moral support whenever required.   

Last but not least, I would like to thank my Parents, \textbf{Siva reddy ,Sasikala}, and my wife, \textbf{Priyamrutha} for their constant encouragement and moral support along with patience and understanding.

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Place: Chennai
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Date: 23/09/2022 \qquad  \qquad \qquad \qquad \qquad \qquad \qquad \textbf{SATEESH KUMAR REDDY C}
