Digital communication lab amplitude shift keying experiment this video gives the basic connections involved in ask. It is widely used for wireless lans, rfid and bluetooth communication. The multiplier can be modeled by analog multiplier or by analog switch figure. At least 10 experiments are to performed by students in the semester. Amplitude shift keying is simply an amplitude modulation where the modulation is not a continuous analogue signal, where all levels are present, but a digital one where only a few levels are present. Frequency shift keying fskamplitude shift keying ask. Any din scheme uses a finite number of distinct signals to represent digital data. The experiment was divided into parts discussed below. Analog communication is an information transmitting mechanism, i. Joshita gupta assistant professor raj kumar goel engineering college. To study and perform phase shift keying modulation and demodulation. In ook, either bursts of a carrier wave are transmitted or nothing is transmitted depending whether the input message signal is 1 or 0.
Binary phase shift keying digital modulation technique for. Practical 1 in this assignment you will generate an amplitude shift keyed ask signal. Ask is similar to standard amplitude modulation except there are only two output amplitudes possible. The modulation is accomplished by varying the sine and cosine inputs at a precise time. In an ask system, the binary symbol 1 is represented by transmitting a fixed amplitude carrier wave and fixed frequency for a bit duration of t seconds. In this lab project, design of the transmitter and design of the receiver each present challenges and opportunities for investigation. Decision maker preparation generation amplitude shift keying ask in the context of.
Amplitude shift keying is one of the basic types of digital modulation techniques. This script simulates the binary amplitude shift keying. Jul 10, 2017 amplitude shift keying ask is one of the methods to squeeze more bits into each pulse of a signal transmission. Generation and demodulation of an amplitude shift keyed ask signal. Bpsk, qpsk, msk frequency shift keying, fsk quadrature amplitude modulation, qam. To understand the signal waveform of the ask modulation. In this form of modulation the sine carrier takes 2 amplitude values, determined by the binary data signal. Amplitude shift keying ask is a form of amplitude modulation that represents digital data as variations in the amplitude of a carrier wave.
To generate and demodulate amplitude shift keyed ask signal using matlab theory generation of ask amplitude shift keying askis a modulation process, which imparts to a sinusoid two or more discrete amplitude levels. Amplitude shift keying ask in the context of digital communications is a modulation. Frequency shift keying fskamplitude shift keying ask receiver uaa3220ts ordering information block diagram type number package name description version uaa3220ts ssop24 plastic shrink small outline package. The information is conveyed by changing the amplitude. Matlab tutorial amplitude modulation how to generate amplitude modulation am using matlab. Ask can be considered a digital version of analog amplitude modulation. The amplitude of an analog carrier signal varies in accordance with the bit stream modulating signal, keeping frequency and phase constant. These are related to the number of levels adopted by the digital message. The ask amplitude shift keying is a modulation method to compress bits into each pulse of a signal transmission where the amplitude of the carrier wave is changed according to the digital inp ut signal, therefore, making it analogous to am analog modulation. This is code for bask only, means it can only modulated two digital states. We can clearly see the long and short bursts of signal.
To understand the operation theory of amplitude shift keying ask. To study and perform frequency shift keying modulation and demodulation. Modulation is defined as a process in which the amplitude of the carrier wave ct is varied linearly with the instantaneous amplitude of the message signal mt. Experiment 1 amplitude shift keying in this laboratory experiment we use emona telecomstrainer 101 to generate an ask signal using the switching method. Amplitude modulation, am frequency modulation, fm double and single sideband, dsb and ssb digital modulation phase shift keying. Since bask is a digital modulation scheme, you can modulate as many bits as you want. In amplitude shift keying ask, the amplitude of the carrier changes in discrete levels in accordance with the input digital signal, while the frequency of the carrier remains the same. Oscilloscope theory amplitude shift keying ask in the context of digital communications is a modulation process, which imparts to a. The simplest and most common form of amplitude shift keying operates as a switch using the presence of a carrier wave to indicate a binary one and its carrier wave to indicate a binary zero. Later, the foundation of transatlantic communication systems had been taken place. Amplitude shift keying theory amplitude shift keying. To implement the ask modulator by using xr2206 ic and mc1496. For a binary message sequence there are two levels, one of which is typically zero. Amplitudeshift keying ask gju electrical and communication.
The lab project is consequently divided into several parts. Amplitude shift keying amplitude shift keying ask is a type of amplitude modulation which represents the binary data in the form of variations in the. To study and perform amplitude shift keying modulation and demodulation. The receiver part investigates demodulation, matched. To generate and demodulate an amplitude shift keyed ask signal and a binary fsk signal. If the digital signal value is 1 then the carrier w ave amplitude remains the same. The technology is used for communication systems such as telemetry, weather balloon radiosondes, caller id, garage door openers, and low frequency radio transmission in the vlf and elf bands. Amplitude shift keying source code file exchange matlab. Amplitude shift keyingask file exchange matlab central. Amplitude shift keying ask modulation code in matlab. Phase shift keying psk is a digital modulation process which conveys data by changing modulating the phase of a constant frequency reference signal the carrier wave.
Aug 23, 2016 experiment of amplitude shift keying by mrs. Experiment 17 amplitude shift keying preliminary discussion an essential part of electronic communications and telecommunications is the ability to share. Binary amplitude shift keying file exchange matlab central. Aug 09, 2016 ask amplitude shift keying amplitudeshift keying ask is a form of modulation that represents digital data as variations in the amplitude of a carrier wave. The binary signal when ask modulated, gives a zero value for low input while it gives the carrier output for high input. This matlab function performs apsk modulation on the input data, x, based on the specified number of constellation points per psk ring, m, and the radius of each psk ring, radii. These signals were examined in the experiment entitled ask amplitude shift keying in this volume. Frequency shift keying fsk is a frequency modulation scheme in which digital information is transmitted through discrete frequency changes of a carrier signal. Our aim is to generate and demodulate an ask signal using an envelope detector.
Frequency shift keying fsk amplitude shift keying ask receiver uaa3220ts ordering information block diagram type number package name description version uaa3220ts ssop24 plastic shrink small outline package. The transmitter part investigates creation of the ask signal and the effect of transmitted pulse shape on the bandwidth of the transmitted signal. As long the state is 1, dual analog switch permits the flow of carrier signal. It would be advantageous to have completed some of the experiments in volume a1 involving linear modulation and demodulation. As an instructor, you can create and edit instances of this lab, assign them to students, and view student progress. Communications experiment 1 amplitude shift keying scratch analysis. If amplitude is the only parameter of the carrier wave to be altered by the information signal, the modulating method is called amplitudeshift keying ask.
In this experiment, we utilize 2206 ic waveform generator and mc1496. The significant invention made by marconi in 1895 was a radio. Based on your location, we recommend that you select. Amplitude shift keying ask is one of the earliest and simplest digital modulations used in telecommunications. Pdf experiment 1 amplitude shift keying kothanda thiliban. Amplitude shift keying article about amplitude shift keying. Amplitude shift keying ask in the context of digital communications is a modulation process which imparts to a sinusoid two or more discrete amplitude levels 1.
Rfic amplitude shift keying ask or onoff keying ook superheterodyne receivers are replacing regenerative receivers in garage door openers, remote keyless entry rke systems, tire pressure monitoring tpm systems, home automation systems and other applications. Out of body experience 432 hz ultra deep isochronic tones meditation music duration. Jun 23, 2015 the bright regions represent signals of high amplitude while the dark areas represent signals of low amplitude. Amplitude shift keying ask is a type of amplitude modulation which represents the binary data in the form of variations in the amplitude of a signal. What are the applications of amplitude shift keying. Amplitude phase shift keying apsk modulation matlab.
This is an online, interactive lab that contains instructions, multimedia, and assessments where students can learn at their own pace. Experiment 1 amplitude shift keying experiment 1 amplitude. This is why it is called onoff keying or amplitude shift keying. Mar 18, 20 amplitude shift keying ask is a form of modulation that represents digital data as variations in the amplitude of a carrier wave. Experiment 20 quadrature phase shift keying 2007 emona instruments 203 at the input to the modulator, the digital datas even bits that is, bits 0, 2, 4. Intro to generation of ask amplitude shift keying ask in the context of digital communications is a modulation process, which imparts to a sinusoid two or more discrete amplitude levels. Am is a method of transmitting signals, such as sound or digital information, in which the amplitude. To understand the methods of measuring and adjusting the ask modulation circuit. Amplitude shift keying ask in the context of digital signal communications is a modulation process, which imparts to. Other articles where amplitudeshift keying is discussed. Choose a web site to get translated content where available and see local events and offers. Amplitude shift keying ask is a modulation process, which imparts to a sinusoid two or more discrete amplitude levels. To plot the wave form for binary amplitude shift keying bask signal using matlab for a stream of bits.
415 787 887 1223 154 641 1444 1302 236 39 21 702 372 1037 923 644 935 807 1421 1401 1079 1034 1517 657 959 1112 1511 1473 326 130 1154 456 248 509 630 844 1434 854 895 482 1211 1420