Digital Modulation Techniques ppt
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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. ... QAM (quadrature amplitude modulation): a finite number of at least two phases and at least two amplitudes are used.
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- 1. PRESENTATION ON “DIGITAL MODULATION TECHNIQUES” SAM HIGGINBOTTOM INSTITUTE OF AGRICULTURE, TECHNOLOGY & SCIENCES PRESENTED BY:- PANKAJ SINGH ID- 13BTECE029 PRESENTED TO:- Er. MANVENDRA YADAV Er. PRINU C. PHILIP
- 2. INTRODUCTION • In a digital communication system, the source to be transmitted is discrete both in time and amplitude • The source information is normally represented as a baseband (low-pass) signal • In digital modulation a high frequency analog carrier signal is modulated by digital bit stream
- 3. 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
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- 6. Digital modulation technique • ASK (Amplitude shift keying) • PSK (Phase shift keying) • FSK (Frequency shift keying)
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- 9. Frequency shift keying In FSK,we change the frequency in response to information one particular frequency for 1 and another frequency for a 0.
- 10. advantages • Digital modulation can easily detect and correct the noise. • Security is more in digital modulation. • Digital modulation signal can travels a long distance.
- 11. Thank you..