Cellular Phone in Communication Engineering

Cellular Phone in Communication Engineering:

What Is Cellular Phone ?

A Cellular Phone is a device that can make and receive telephone calls over a radio link while moving around a wide geographic area. Mobile Phone Is Also Known As Cellular Phone.



It does so by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network. By contrast, a cordless telephone is used only within the short range of a single, private base station.

Structure of Cellular Phone :

A Cell-phone handset is basically composed of two sections.

1. RF Section

2. Base band Section

What is RF Section :

                               
RF refers to radio frequency, the mode of communication for wireless technologies of all kinds, including cordless phones, radar, ham radio, GPS, and radio and television broadcasts. RF technology is so much a part of our lives we scarcely notice it for its ubiquity. From baby monitors to cell phones, Bluetooth® to remote control toys, RF waves are all around us. RF waves are electromagnetic waves which propagate at the speed of light, or 186,000 miles per second (300,000 km/s). The frequencies of RF waves, however, are slower than those of visible light, making RF waves invisible to the human eye.

What is Baseband Section :

In signal processing, base band and describes signals and systems whose range of frequencies is measured from zero to a maximum bandwidth or highest signal frequency. It is sometimes used as a noun for a band of frequencies starting at zero.