- ISBN: 9788188849505
- Author: Dr. K N Hari Bhat & DR. D. Ganesh Rao
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About this eBook
This book presents the basic principles and analysis involved in Analog Communication Systems. The text material provided may be broadly divided in to two viz Analog communication techniques and their behavior under the in uence of noise. The mathematical techniques involved in this book is at a moderate level. This is kept in mind in view of the readers who have a moderate background of differential and integral calculus. And still, the book provides exposure to some of the sophisticated analytical techniques such as Fourier transform, Spectral analysis and the performance of systems in the presence of noise. The material has been developed in an organized manner by including the necessary basic topics in separate chapters. For example, Chapter 1 gives an overview on Fourier transforms and its properties keeping in mind that knowledge of the subject is necessary to understand the various techniques discussed on Analog communication. Chapter 2 develops various forms of Amplitude modulation techniques that include conventional AM, Double Side Band DSB , Single Side Band SSB , and Vestigial Side Band VSB . Various forms of generation and detection of these schemes have been discussed. A detailed study in terms of bandwidth, spectral forms and other factors has been provided for each of the modulation techniques. A brief introduction on Television has been provided at the end of the chapter. The major forms of Angle modulation techniques have been developed in Chapter 3. This includes Phase modulation and Frequency modulation. Starting with the basic terms such as time and frequency domain representations, it develops estimation of transmission bandwidth and discusses in detail the different types of generating wide-band and narrow band modulation techniques. Various forms of demodulation processes have been considered. An article on FM stereo multiplexing has been provided. A discussion on Probability, Random Variables and Random Processes have been introduced in Chapter 4, in view of the essentiality of the subject to understand the behavior of noise present in different communication systems. This chapter is developed by discussing the basic elements and properties of probability and random process and focus on Gaussian distribution, Stationarity, white noise process, power spectral density and autocorrelation function. Two chapters have been devoted to noise in view of the importance of the subject. Chapter 5 discusses the various forms of noise and their power spectral densities and bandwidths in a general perspective. The concept of noise gure and effective noise temperature are introduced. Analysis of cascade noisy system is performed. Chapter 6 deals with the noise in continuous-wave modulation systems. Noise in various types of AM and FM receivers and terms like signal-to-noise ratios, carrier-to-noise ratios, gure of merit have been developed. vii
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Appendix A provides an insight to the basics of communication system discussing various points such as Electromagnetic wave propagation, their frequency ranges and typical applications, bandwidth spectrum and application of decibel gain, loss, measurement, reference standards etc. Appendix B provides a brief introduction to radio receivers and related terms like sensitivity and selectivity. Importance is given to Superheterodyne principle, different stages used and its advantages over other receivers.