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Reply To: Modulation


3 Basic Types of modulation are :
1. FSK – Frequency Shift Keying.
2. ASK – Amplitude -,,-
3. PSK – Phase -,,-

All the modulation such as QPSK, GMSK etc are derieved from these basic types.

GSM uses GMSK(Gaussian Minimum Shift Keying) and WCDMA-FDD used QPSK (Quadrature Phase Shift Keying)