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This presentation discusses digital modulation techniques. It begins by explaining that in digital communication systems, the source information is discrete in both time and amplitude and is normally represented as a baseband signal. It then defines digital modulation as adding an information bit stream to a high frequency analog carrier signal. The main digital modulation techniques discussed are Amplitude Shift Keying (ASK), Phase Shift Keying (PSK), and Frequency Shift Keying (FSK). ASK varies the amplitude of the carrier signal, PSK varies the phase, and FSK varies the frequency. Key advantages of digital modulation are that it can easily detect and correct noise, provides greater security, and allows signals to travel long distances.
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13btece029-161028031150 (1) (1).pptx
- 1. PRESENTATION ON DIGITAL MODULATION TECHNIQUES SAM HIGGINBOTTOM INSTITUTE OF AGRICULTURE, TECHNOLOGY & SCIENCES PRESENTED BY:- PANKAJ SINGH ID- 13BTECE029 PRESENTED TO:- Er. MANVENDRAYADAV Er. PRINU C. PHILIP
- 2. INTRODUCTI ON 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
- 5. Types of digital modulation technique Coherent Non coherent Coherent; In coherent modulation technique process received signal with a local carrier of same frequency and phase. Non coherent;In Non coherent digital modulation technique there is no requirment of reference wave.
- 6. Digital modulation technique ASK (Amplitude shift keying) PSK (Phase shift keying) FSK (Frequency shift keying)
- 7. Amplitude shift keying In ASK, the amplitude of the signal is changed in response to information. Bit 1 is transmitted by a signal of one particular amplitude to transmit 0, we change the amplitude keeping the frequency constant.it is shown below
- 8. Phase shift keying In PSK,we change the phase of the sinusoidal carrier to indicate information . To transmit 0,we shift the phase of the sinusoidal by 180 phase shift represents the change in the state of the information.
- 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..