Modulation and its Necessity
Modulation is the process of variation of some characteristics of a carrier wave in accordance with the instantaneous value of a modulating signal.
Types of...
Bandwidth of Signals
The bandwidth of a signal is defined as the difference between the upper and lower frequencies of signal. In a communication system, the message...
Propagation of Electromagnetic Waves
Propagation of electromagnetic waves
Ground (surface) wave propagation:
Ground or surface waves are the radio waves which travel along the surface of the earth as shown...
Elements of Communication System
Each and every communication system has 3 essential elements and they are
Transmitter
Communication Channel
...
Amplitude Modulation
Amplitude Modulation
In amplitude modulation, the amplitude of the carrier is varied in accordance with the information signal.
AM can be represented by expression
Let c(t) =...