[...]... acquisition of real signals is typically straightforward and efficient And third, we will see that LabVIEW has loads of built-in signal processing tools that are simple to drop into a VI and start using And finally, you will find that most of the hardware available out there is compatible with LabVIEW We have seen that LabVIEW can accommodate both a conventional digital receiver and an all -digital receiver... left blank LabVIEW Digital Signal Processing This page intentionally left blank Part 1 Getting Started 1 Copyright © 2005 by The McGraw-Hill Companies, Inc Click here for terms of use This page intentionally left blank Chapter 1 Digital Communications and LabVIEW When most people think of digital communications, they probably imagine that it has something to do with computers talking back and forth... a digital communication system in a LabVIEW environment and assemble those pieces into a digital receiver Of course the LabVIEW tools that are developed in this book are by no means considered real time There will be a lot of overhead due to the PC running Windows, then overhead from LabVIEW all on top of the computations and display updates involved in demodulating our Digital Communications and LabVIEW. .. a book about how to use LabVIEW or even a book on learning digital signal processing (DSP) Instead it is more of a practical guide on how to enable LabVIEW to tackle some real-world DSP and communication problems This book assumes that the reader has a good grasp of many of the complex issues encountered in DSP and digital communications and also is at least skilled enough in LabVIEW to build a VI When... Y Tsui, and J Caschera, “Direct Bandpass Sampling of Multiple Distinct RF Signals,” IEEE Transactions on Communications, vol 47, pp 983–988, July 1999 2 Liu, J., X Zhou, and Y Peng, “Spectral Arrangement and Other Topics in First-Order Bandpass Sampling Theory,” IEEE Transactions on Signal Processing, vol 49, pp 1260–1263, June 2001 3 Vaughan, R G., N L Scott, and D R White, “The Theory of Bandpass... Transactions on Signal Processing, vol 39, pp 1973–1984, September 1991 Chapter 2 Getting a Signal into LabVIEW Before we can start performing any sort of digital processing with LabVIEW, we have to somehow obtain the signal that we would like to analyze Chapter 1 outlined two types of digital receivers The first type was the conventional digital receiver that heterodynes the radio frequency (RF) signal down... box that takes in a high-frequency RF signal with some specified bandwidth and pipes digital samples right into LabVIEW You could also build your own RF interface to perform the filtering and mixing and present a suitable IF signal to some off-the-shelf A/D acquisition card But the focus of this book is really on the digital communication capabilities of LabVIEW and not on the design of RF hardware... that exist, there are even more digital communication protocols: GSM, CDMA, OFDM, 802.11(b and g), Ethernet, APCO-25, as well as emerging protocols such as EDGE and W-CDMA The list of wireless digital communication standards in Table 1.1 is only a fraction of the digital communication systems in use today and each of them has its own unique frequency band, signaling format, and multiple access method These... data acquisition, and excellent display utilities for viewing these digital signals at various points in the communication system We will see how simple LabVIEW virtual instruments (VIs) can be built and combined to produce a flexible and powerful digital communication test system Building such a LabVIEW- based communication system will allow for new interface standards to be quickly and easily integrated... what they do not realize is that digital communications is really about sending digital data through some kind of medium that is much more suited to analog signals Let’s face it—the world is an analog place and, in fact, digital communications actually involves the transmission of a set of discrete analog waveforms Perhaps digital communications should be renamed discrete communications At least we can .