Modulation techniques in satellite communication ppt

The most fundamental digital modulation techniques are based on keying: PSK (phase-shift keying): a finite number of phases are used. FSK (frequency-shift keying): a finite number of frequencies are used. ASK (amplitude-shift keying): a finite number of amplitudes are used.

The advantages provided by digital modulation techniques include: Better performance . Better Error detection and correction efficiency. Better Signal to noise ratio so less prone to interference or noise.

Modulation is the process of converting data into electrical signals optimized for transmission. Modulation techniques are roughly divided into four types: Analog modulation, Digital modulation, Pulse modulation , and Spread spectrum method .

A satellite modem or satmodem is a modem used to establish data transfers using a communications satellite as a relay . A satellite modem’s main function is to transform an input bitstream to a radio signal and vice versa.