Quadrature amplitude modulation qam is the modulation scheme used by modern dialup modems. Quadrature amplitude modulation qam uses four predetermined amplitude levels to determine digital bits. Direct current dc comes from a source of constant voltage and is. A labviewbased analog modulation tool for virtual and real experimentation article pdf available in ieee antennas and propagation magazine 546. Labview will now generate the code for the function. Palette object description mt modulate am performs amplitude modulation am on an rf carrier wave, with optional suppression of the carrier wave, according to a.
Musical signal processing with labview modulation synthesis. This lab introduces students to communications theory with amplitude modulation and demodulation. Amplitude modulation am is normally associated with communications systems. Please see the labview quickstart guide 1 module for tutorials and documentation that will help you. Execution is determined by the structure of a graphical block diagram the lv. This tutorial is part of the national instruments measurement fundamentals series. For a perfect modulation, the value of modulation index should be 1, which implies the percentage of modulation should be 100%. Quadrature amplitude modulation qam requires changing the phase and amplitude of a carrier sine wave. This amplitude modulation is tested in ni usrp rio 2920 as transmitter. For future reference, this manual is available both electronically and in print. Amplitude modulation am is an analog modulation scheme where the amplitude a of a fixedfrequency carrier signal is continuously modified to represent data in a message. Pdf simulation of analog modulation and demodulation.
Pdf a labviewbased analog modulation tool for virtual. Watch other videos like ask and fsk video also i provide the videos in endscreen. Am, fm, and pm modulation formats, and is capable of if to iq conversion, iq. Quadrature amplitude modulation tutorial qam tutorial. The labview modulation otolkit o ers a powerful way to quickly implement and explore a wide arietvy of. Equalization labview modulation toolkit documentation. One of the easiest ways to implement qam with hardware is to generate and mix two sine waves that are 90 degrees out of phase with one another. Fourier transform, pulse amplitude modulation, pulse code modulation, line codes and. Preparation of a virtual toolkit for communication systems. Note that this is on the very low end of the recommended voltage range.
Introduction to communication systems using national. Pdf an analog method to modulate and demodulate signals is. The modulation toolkit employs an adaptive feedforward equalizer, which implies that the equalizer taps continuously adapts its coefficients to compensate for the action of. Quadrature amplitude modulation qam national instruments. In this video you will see amplitude modulation using different type of signals and channels. Pdf implementation of analog modulation techniques using. Then, students will use labview to program an am demodulator and use it to explore and visualize the effects. 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. Amplitude modulation a continuouswave goes on continuously without any intervals and it is the baseband message signal, which contains the information.
Pdf a labviewbased analog modulation tool for virtual and. The programming language used in labview, called g, is a dataflow language. The second is to investigate classical analog amplitude modulation and the envelope detector. Pdf lab manual, labview code instructor resources labview code solutions. Analog use the vis on the modulation subpalette to perform analog modulation of amplitude am, frequency fm, and phasemodulated pm signals. This tutorial discusses analogmodulation techniques with the labviewbased analogmod package, developed for the illustration of different modulation types in undergraduate labs. Lowersinglesideband amplitude modulation was taken.1102 294 424 522 564 1079 1183 639 319 254 936 1349 756 257 550 1160 978 515 87 389 1174 448 1509 1433 1590 95 157 631 48 373 1551 874 605 1599 460 1554 628 281 2 1346 1268 646 589 1252 1270 587 331 1233