Question

Explain the concept of modulation and its need in long distance communication

Answer 1

The basic concept of modulation is that the message signal in its original form cannot be transmitted through the channel as it will get distorted therefore we superimpose our message signal over a carrier having high frequency, energy and amplitude

There are two types of modulation

Frequency modulationAmplitude modulation

Modulation is used in wireless communication such as

WifiMobile communication

AMPLITUDE MODULATION

When instantaneous amplitude of the carrier varies with respect to instantaneous amplitude the message signal and frequency remains uneffected.

FREQUENCY MODULATION

When the instantaneous frequency of carrier signal varies with respect to instantaneous frequency message signal and amplitude remains constant.