There are three predominant methods of encoding a transmission signal. Amplitude modulation (AM), and frequency modulation (FM) are both analog modulation schemes. The third method is digital modulation.
In Digital modulation followings are involved. They are,
- QPSK( Quadrature Phase Shift Keying )DVB-S
- QAM( Qudrature Amplitude Modulation )CABLE
- COFDM( Coded Orthogonal Frequency Division Mulitiplexing )DVB-T
No comments:
Post a Comment