Abstract
<p class="0abstract"><span lang="EN-IN">An analog method to modulate and demodulate signals is presented in this short paper. This paper discusses modulation techniques with the LabVIEW-based RF communications package, developed for the illustration of different modulation types in undergraduate virtual instrumentation labs. The tool can generate and display the time and frequency domain behaviours of modulated signals with the help of spectral and tone measurements icon. All the modulation parameters can be specified by the user. This signal processing tool in the block diagram is also enables adding noise to a modulated signal, and selecting among different types of baseband pulse-shaping filters. The transition between the virtual and the real world is accomplished via data-acquisition cards, installed in PCs. The results of simulation show that the interface of each system is beautiful, the parameters are easy to adjust and the process of modulation-demodulation is simpler than the traditional system which is designed by hardware circuit. </span>This Amplitude modulation is tested in NI USRP RIO 2920 as transmitter. The carrier frequency used is 555-1650 KHz for amplitude modulation and the carrier frequency is 88-108 MHz in India.</p>
Highlights
Communication is the process of exchanging information
The encoded symbols transmitted in the AWGN channel, at the receiver information is decoded and which recreates the original message signal [1]
The modulation schemes are broadly classified into two categories such as continuous and digital modulations [3].The topic for implementation is Amplitude & Frequency modulation followed by demodulation
Summary
Communication is the process of exchanging information. The encoded symbols transmitted in the AWGN channel, at the receiver information is decoded and which recreates the original message signal [1]. Modulation technique is used to reduce the antenna height and increases the range of communication, multiplexing and improves quality of reception [2]. As literature survey shows that few papers are available to describe about basic voice/signal modulation and demodulation in LabVIEW and TMS320C6748 DSP kit [4]. Hardware integration can be done rapidly which aids to acquire and visualize data sets from virtual I/O devices and real time signals. It is combined with graphical programming syntax that reduces programming time [5]. LabVIEW programs are called Virtual Instruments or VIs, because their appearance and operation imitate physical instruments such as oscilloscopes, multimeters, signal generators and other basic electronic input/output devices [6]. Graphical user interface system is explained for analog data.[7]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
