Digital modulation techniques. Modulations systems.

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Presentation transcript:

Digital modulation techniques

Modulations systems

Channel capacity

Reasons for choosing encoding techniques

What is modulation ? Modulation = Adding information to a carrier signal The sine wave on which the characteristics of the information signal are modulated is called a carrier signal

Analog modulation

Digital modulation and demodulation

Signal characteristics that can be modified signal x(t) = A cos(2πft + Φ) A – amplitude f – frequency Φ – phase (initial angle of the sinusoidal function at its origin

Modulation

Modulation (1)

Digital modulation techniques

ASK ASK On-off keying (Amplitude Shift Keying) – frequency is kept constant, amplitude has 2 levels (for bit 1 and for bit 0) The binary sequence

FSK (Frequency shift keyring)

PSK (Phase shift keyring)

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