Digital data is represented as variations in the amplitude of a carrier wave in amplitude-shift keying (ASK), a type of modulation. In an ASK system, a symbol, representing one or more bits, is sent by transmitting a fixed-amplitude carrier wave at a fixed frequency for a specific time duration. A simple form of ASK modulation is considered that amplitude modulates a carrier based on a direct mapping of the source data bits to the waveform symbol. The most rudimentary form of ASK is given the special name On–Off Keying (OOK) modulation.

1. AMPLITUDE SHIFT KEYING (ASK)
SubmittedTo:
Mr. Rifat Ahommed
Lecturer
Department of Computer
Science & Engineering
Southeast University
Group Members:
Lamisa Sobnom Faria
2019000000097
Md. Faysal Khandker
2019000000099
Shanta Akter
2019000000103

2. CONTENTS
• Introduction
• Modulation
• Demodulation
• Waveform
• Equation
• Advantages
• Disadvantages
• Applications

3. INTRODUCTION
•Amplitude-shift keying (ASK) is a form of
modulation that represents digital data as
variations in the amplitude of a carrier wave.
•The amplitude of an analog carrier signal
varies in accordance with the bit stream
(modulating signal), keeping frequency and
phase constant.
•The level of amplitude can be used to
represent binary logic 0s and 1s.

4. MODULATION
• Generate carrier signal.
• Start FOR loop
• Generate binary data, message
signal(on-off form)
• Generate ASK modulated signal.
• Plot message signal and ASK
modulated signal.
• End FOR loop.
• Plot the binary data and carrier.

5. DEMODULATION
• Perform correlation of ASK signal
with carrier to get decision variable.
• Make decision to get demodulated
binary data. If x>0, choose ‘1’ else
choose ‘0’
• Plot the demodulated binary data.
• Some sort of decision-making
circuitry to get the bit stream back.

6. WAVEFORM

7. EQUATIONS

8. ADVANTAGES
• It can be used to transmit digital data over optical fiber.
• The receiver and transmitter have a simple design
which also makes it comparatively inexpensive.
• It uses lesser bandwidth as compared to FSK thus it
offers high bandwidth efficiency.
• The wave generated is quite simple to detect and
generate

9. DISADVANTAGES
• It has very poor bandwidth efficiency .
• Not suitable for wireless communication.
• It is not fit for high bit rate data transmission.
• High power consumption.

10. APPLICATIONS
• Low-frequency RF applications.
• Home automation devices.
• Industrial networks devices.
• Wireless base stations.
• Tire pressuring monitoring systems.
• Used in satellite link.

11. THANK YOU