Low-frequency am modulation simulation with labview software

Vissim includes, for example, passive and active low. Modulation techniques pwm and pulse code modulation. Use a convolutional neural network cnn for modulation classification. Lowfrequency am modulation simulation with labview duration. For more information about the awr design environment and vss software, please visit. Sep 03, 2016 i want to do amplitude modulation of an audio signal. Feb 19, 2015 60 understanding rf circuits with multisim additional challenge doubleclick on the am source of figure 121 to change its modulation index parameter to 1. More than 40 million people use github to discover, fork, and contribute to over 100 million projects.

Pdf a labviewbased analog modulation tool for virtual. Spectrum sensing and blind automatic modulation classification in real time michael paul steiner thesis submitted to the faculty of the virginia polytechnic institute and state university in partial fulfillment of the requirements for the degree of master of science in electrical and computer engineering tamal bose jeffrey reed s. Although it may not be quite as straightforward as amplitude modulation, nevertheless frequency modulation, fm, offers. Amplitude modulation am mathematics 1 this module refers to labview, a software development environment that features a graphical programming language. Dynamic frequency estimation under low frequency ampm modulation m b martins, r m debatin, a m r franco. Use a highpass filter to remove the lower sideband signal. I use the cow in most communication systems classes to demonstrate the concepts covered on that days topic. The design was initiated with the simulation of the complete system in labview. Question asked by terokaija on mar 19, 2006 latest reply on mar 20, 2006 by wrivas. A two channels am modulator is used to create the 2 signals which feed the two equivalent blade electrodes by using the carrier frequency w hich feed the probe.

Aug 28, 2015 double polarity pulse amplitude modulation. It is also possible to change the frequency of a signal to give frequency modulation or fm. In the context of radio communication, near the end of the 2oth century, few modulated signals contain a significant component at carrier frequency. The demodulator is the circuit, or for a software defined radio, the software that is used to recover the information content from the overall incoming modulated signal. In single polarity pulse amplitude modulation, there is fixed level of dc bias added to the message signal or modulating signal, so the output of modulating signal is always positive. A software defined radio consists of a programmable communication system where functional changes can be made by merely updating software. The modulation of a signal is essential if one wishes to transmit it over long distances.

Modulation is the process of varying a higher frequency carrier wave to transmit. Modulation is a process of mixing a low frequency information and high frequency carrier through a nonlinear device. Envelope detection has numerous applications in the fields of signal processing and communications, one of which is amplitude modulation am detection. The correct performance of the simulated system was successful. Am, fm, and fsk modulation are available am modulation can also be done on the arbitrary waveforms. Amplitude, phase and frequency are the three key parameters of a sine wave.

In amplitude modulation, the amplitude signal strength of the carrier wave is varied in proportion to that of the message signal being transmitted. Manuscripts by academy of information and management sciences journal. Using the virtual model in teaching digital signal processing. I searched the forums but couldnt find a problem similar to mine. While simulation results show that low latency and high tracking bandwidth can.

Modulation capabilities vary from generalpurpose am, fm and. As part of the modulation practices we simulated this am modulator circuit to test the effects of the modulation quotient in the signal we plan to transfer. Project a is a programming and measurement exercise that emphasizes and explores the use of labview daq software, the discrete nature of analogtodigital and digitaltoanalog conversions, labviewbased voltmeters with autoranging, ac voltmeters, and simultaneous sending and receiving of waveforms initiated with a function generator. Simulation and measurement of bilayer sensor characteristics. Software defined radio devices are tunable universal software radio peripheral usrp transceivers. Amplitude modulation am is a modulation technique used in electronic communication, most commonly for transmitting information via a radio carrier wave. Lowfrequency am modulation simulation with labview. They are often used in automotive applications camcrankshaft position, aeronautics flap position, as well as servos and industrial. Fm frequency modulation modulation and demodulation circuit simulation using bc107 with multisim software. As an example, the following figure shows the amplitude modulation with mtsi n2. This software is targeted at third grade universities which might not have the capacity to purchase expensive devices such as spectrum analyzers and the likes.

Amplitude modulation am is a one of the conventional technique used to transmit message signals using a carrier wave. Application note resolver simulation using an arbitrary waveform generator introduction. Labview programs are called virtual instruments or vis, because their. Hi, having recorded a 3150hz test tone on my turntablerecord player, i wish to demodulate the resulting fm signal using labview. A graphical programming software labview and hardware daq boards, gpib interface etc. The use of simulation software in education is one of the modern training methods. Please see the labview quickstart guide 2 module for tutorials and documentation that will help you. Pdf a labviewbased analog modulation tool for virtual and. Dynamic frequency estimation under low frequency ampm modulation. What is fm, frequency modulation electronics notes. Enables prototyping of wireless communication systems with labview powered radios. A labview based analog modulation tool for virtual and real experimentation article pdf available in ieee antennas and propagation magazine 546. Application note resolver simulation using an arbitrary. Study of modulation using graphical programming and.

Each offers synthesized frequency accuracy and stability, excellent calibrated level accuracy, and remote programmability. Construct a labview vi that transmits and receives a signal in software using am. Understanding rf circuits with multisim 10 a workbook with 21 circuit experiments by tracy shields notice to the reader the reader is expressly warned to consider and adopt all safety precautions that might be indicated by activities described herein and to avoid all potential hazards. This lab introduces students to communications theory with amplitude modulation and demodulation. Demonstration of amplitude modulation am using the toolkit. These two signals were generated using two wien bridge oscillators. Study of modulation using graphical programming and virtual instruments. The simulation only runs for 100 microseconds time, as otherwise the data sizes would be too large at this sampling rate. Jul 18, 2019 we can analyze the waveforms and do comparisons with the theory due to the simulation results are performed by waveforms. Run the simulation and note the difference in the waveform at the output of the detector. Lowfrequency am modulation simulation with labview youtube.

In the double polarity pulse amplitude modulation, the output of modulating signal will have both positive and. The output of the vi, however, does not seem coherent and i was wondering if anyone could tell me why. A new highperformance digital fm modulator and demodulator for software defined radio and its fpga implementation. This included the modulation of two sine waves, a reference and a sensor signal under the amplitude modulation principle, and their demodulation via the lockin technique. Modulation techniques can be broadly divided into analog modulation and digital modulation. Set channel a to output an am signal with fc30khz, vc1v fm1khz, and m0. The implementation of the qpsk communication system is developed in labview. Simulation of rotating blades which vibrates using arbitrary. Hello, i am new to labview and am trying to implement a basic bpsk modulator vi. Amplitude 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.

Modulation toolkit is a software addon with functions and tools for signal generation, analysis, visualization, and processing of analog and digital modulated signals. Labview is a software development environment that contains numerous components and tools for building a wide variety of applications. Labview co simulation within the awr design environment enables a broad range of applications including hardwareintheloop, correlation between simulation and test, and advanced system design. Introduction to labview cosimulation in awr visual system.

The signals envelope is equivalent to its outline, and an envelope detector connects all the peaks in this signal. Fm modulation and demodulation circuit multisim live. In this paper, a software defined radio 4qam quadrature amplitude modulation modem system is implemented in labview. This generator can generate 1 hz to 25 mhz sine and square waves, 1 hz to 5 mhz triangle and ramp waveforms, and 1 mhz to 10 mhz pulses. Amplitude modulation am is one form of analog modulation. Design and simulation of amplitude modulation network for. Labview modulation toolkit download national instruments. Niknejad university of california, berkeley eecs 142 lecture 15 p. Fpga implementation of an amplitudemodulated continuouswave. This tutorial is part of the national instruments measurement. Computers and internet social sciences, general laboratories equipment and supplies laboratory equipment. A labview based analog modulation tool for virtual and. Am modulation we can see that an upconversion mixer is a. The usage of labview software and its vi programs are explained in this paper and it has taken as.

Seven guiding principles motivate the design and organization of communication systems projects with labview. Electronic design software solutions free trial orcad. Simulation time is chosen to be 2 secs for the spectrum analyzers. For this research simulations were first developed in matlab. Observe the results on the scope and spectrum analyzer for 25, 50, 75, and 100 percent modulation sketch roughly in lab notebook. A resolver is an electromagnetic sensor that is used to determine the mechanical angle and velocity of a shaft or axle. A modulator, followed by a filter, is sufficient to obtain an amplitude modulated signal, but it should be pointed out that this type of modulation generates numerous distortions. That design wasnt meant for passing frequencies high enough to be able to pass an audio file, e. Frequency modulation is used in a radio broadcast in the 88108mhz vhf band. Communication systems projects with labview has been designed to augment existing communication systems laboratory projects, or to serve as the complete laboratory component of an introductory engineering communication systems course. These parameters can be modified in accordance with a low frequency information signal to obtain the modulated signal.

Amplitude modulation am is the simplest and the oldest of modulation methods, primarily because the stage of demodulation, at the receiver, is simple to carry out. The amplitude modulated ultrasonic signal and the ir signals were sent and received at targeted distance by the matching receivers. Amplitude modulation is one of the oldest forms of modulation in analog. Learn more about national instruments software for digital filter design. Is this the correct way to create fm modulated signal in ads or is. Dynamic frequency estimation under low frequency ampm modulation m b martins, r m debatin, a m r franco inmetro email. From top to bottom, they are coloured blue, red and purple, and are mathematically described by the following. Design and implementation of amplitude modulator and demodulator introduction communication is the most important needs from the very beginning of civilization. Amplitude modulation am interactive simulations edumedia.

The low frequency generator is used to modulate the blade passing frequency in order to simulate the vibration. Introduction to matlabsimulink am modulator and demodulator. Highsensitivity operation of singlebeam optically pumped. Labview is a widely used graphical programming environment which allows. A simulation of a complete digital communication system with different modulation schemes in matlab for. This work proposes the utilization of an iterative algorithm applied to some fitness functions to estimate accurately the frequency of a sampled signal with. Tdm, tdma, am, fm simulations using labview ni community. Similarly, answer the questions in task2 based on this model. The radio wave was called a carrier, since it was seen to carry the speech information with it.

This application proposes a data hiding scheme for amplitude modulation am radio broadcasting systems. Simulate lowfrequency am modulation withlabview learn more about national instruments tools for rf and communications applications in academia view additional multimedia resources, examples, and more, to learn more aboutnational instruments software and hardware for rf and communications applications in academia. This will enable me to examine the wow and flutter present possibly displaying such on a polar plot. National instruments labview is an industryleading graphical software tool for designing test. Short paper simulation of analog modulation and demodulation techniques in virtual instrumenta fig 1 explains the operation of amplitude modulation in which the amplitude of carrier signal is. Hi, id like to do the following simulations using labview. What are the options i have for modelling amplitude. Modulation also provides a means for simultaneous transmission of several signals, using the same transmission channel hertzian, cable. Am modulation of audio file matlab answers matlab central.

Mar 22, 2007 this brief demo shows how to use graphical programming in national instruments labview to quickly build a simple simulation showing low frequency am modulation. Basic bpsk modulator in labview ni community national. The message signal is, for example, a function of the sound to be reproduced by a. Specifically, i have a hard time determining if the output is correct using a waveform chart because it does not display a. The tool can generate and display the time and frequencydomain behaviors of modulated. The fm modulator baseband block applies frequency modulation to a real input signal and returns a complex output signal. To understand the theoretical foundations of analog communications as well as of doublesideband amplitude modulation and demodulation dsbam. Teach the basics of frequency modulation and demodulation. A software defined radio comparison of received power with.

Apply labview to audio signal processing get started with labview. Labview page 5,741 ni community national instruments. Fm modulacao por frequencia ofdm sim4 matlab code for fading channel. In order for the lowpass to detect the information envelope, the frequency of the.

Pcm based digital communication system using labview. The national instruments developer zone o ers twentytwo software simulation and examples that explore a. Dynamic frequency estimation under low frequency ampm. The process of demodulation for signals using amplitude modulation can be achieved in a number of different techniques, each of which has its own advantage. Frequency division multiplexing simulink matlab jobs. If any of the lo leaks into the rf path, then it will selfmix and produce a dc offset. Amplitude modulation am, frequency modulation fm and phase modulation are the most common analog modulation techniques. Modulation is the process in which some property of the high frequency wave, also called as carrier wave is altered in such way by low frequency information signal, called as. Cannot see ni gnss simulation toolkit palette in labview. I got the idea for this circuit from one of my professors. Students will explore the mathematical theory behind amplitude modulation and use the analog discovery 2 to visualize the effects of amplitude modulation in the time and frequency domains. Explorations in communication systems using a virtual toolkit. National instruments labview is an industryleading graphical software tool for designing test, measurement, and automation systems. Multisim simulation of amplitude modulation youtube.

Pdf this tutorial discusses analogmodulation techniques with the. Close labview and open a fresh instance of the software. Then, students will use labview to program an am demodulator and use it to explore and visualize the. Pcm based digital communication system using labview habibur rahman, mehadi hassan, faruque hossain. Simulate lowfrequency am modulation with labview learn more about national instruments tools for rf and communications applications in academia view additional multimedia resources, examples, and more, to learn more about national instruments software and hardware for rf and communications applications in academia. Pdf simulation of analog modulation and demodulation. The simulation is based on multisim and labview co simulation. A labviewbased analog modulation tool for virtual and real experimentation article pdf available in ieee antennas and propagation magazine 546. Amplitude modulation this is lab 2 of 12 in the course by dr. Frequency modulation is widely used on frequencies above 30 mhz, and it is particularly well known for its use for vhf fm broadcasting. Get access to the full version of the latest release of orcad electronic design software solutions for free, including orcad capture cis, orcad pspice designer, orcad pcb designer professional, orcad sigrity erc, and more. The simulation results are presented to compare the system performance in virtual.

It does signal encoding and decoding, filtration, modulation and even has awgn noise option incorporated into it. Psk, quadrature amplitude modulation qam, frequency. Tdm timedivision multiplexing tdma timedivision multiple access am amplitude modulation fm frequency modulation any info would be helpful. What are the options i have for modelling amplitude modulation of a low frequency signal with a very high frequency ghz range carrier in simulink. Amplitude modulation and demodulation circuit simulation in multisim. Fm generation vi accepts two types of message signal input waveform or array. The instrument comes with a serial port and an optional ieee488 gpib port.

You then test the cnn with software defined radio sdr hardware and overtheair. This method of spwm simulation has some software and harmonic which must be taken into account while using it in the real power grid. The nirfmx demod provides an api to perform measurements on digital and analog modulated signals including qam, ask, fsk, msk, psk, am, fm, and pm modulation formats. The amplitude or strength of the high frequency carrier wave is modified in accordance with amplitude of the message signal. Using the generated waveforms as training data, you train a cnn for modulation classification.

An advantage of frequency modulation is that it has a larger signaltonoise ratio and therefore rejects radio frequency interference better than an equal power amplitude modulation am signal. This vi generates frequency modulated signal output according to wired message signal. The process and the signal were called amplitude modulation, or am for short. A labview based analog modulation tool for virtual and real. If you are a newbie to simulink, please read our article introduction to simulink.

So any virtual instrument or vi, a term used for labview programs that i develop and save on the network drive may be easily run in any classroom. An interactive demo which enables you to both see and hear the result of multiplying a sine wave with a cosine amplitude envelope. Quadrature amplitude modulation qam is the modulation scheme used by modern dialup modems. Study of modulation using graphical programming and virtual. The theoretical analysis indicates that at low frequency the modulation method is beneficial, especially because it reduces laser technical noise by shifting the measured signal to high frequency, and at high frequency, modulation does not give any benefit and leads to some additional complexities of signal processing.