physics principles in communication systems

Basic Principles of Wireless Radio Communication - Let us now discuss the basic principles of wireless radio communications. We shall mainly concentrate on the principle of amplitude modulation and demodulation. The simplest scheme of wireless ..

Previously, we were adding sine waves of exactly the same frequency. Now, we shall add sine waves of different frequencies, but close to each other. In this case, as time goes on, the sine waves would get increasingly out of phase with each other. The simplest case would be the sum of two equal sin..

When the amplitude of high frequency carrier wave is changed in accordance with the intensity of the signal, it is called amplitude modulation. In amplitude modulation, only the amplitude of the carrier wave is changed in accordance with the intensity of the signal. However, the frequency of the mo..

. Telephone and telegraph wires; audio, video, and radio cables; and the myriad nerve fibers in our bodies are all transmission lines. The interconnections of all electric circuits are transmission lines, and in a broad sense waveguides and optical fibers, and even radio links maybe regarded as tra..

Analog and Digital Communication - The concept of information is central to communication. There is no precise definition of the word "information". So, instead of information, we deal with "message..

..

..

..

..

..