Analog modulation techniques

The technology behind the Global System for Mobile communication (GSMTM) uses Gaussian Minimum Shift Keying (GMSK) modulation a variant of Phase Shift Keying (PSK) with Time Division Multiple Access (TDMA) signalling over Frequency Division Duplex (FDD) carriers.

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.

Modulation is the process of converting data into radio waves by adding information to an electronic or optical carrier signal . A carrier signal is one with a steady waveform — constant height, or amplitude, and frequency.