075-QAM Digital Communications
By: Raymond L. Barrett, Jr., PhD, PE
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Course Objective
This continuing education course is written specifically for professional engineers with the objective of relating to and enhancing the practice of engineering.
Course Description
This course introduces both analog and digital communications concepts and some of the reasons for the migration from analog to digital technologies. Pertinent analog signal and system concepts are reviewed for comparison and contrast to corresponding digital concepts. Digital representation of analog signals is introduced in both the time and frequency domains so that analog transmission of digital signals could be compared.
Versions of "Suppressed Carrier" modulation progressing from the original Weaver modulator architecture are developed for "Single-Sideband, Suppressed Carrier" analog voice applications through variations to other applications. We add phase modulation and amplitude modulation to the Weaver architecture showing the development of quadrature techniques for using both upper and lower Weaver sidebands to produce independent "I" and "Q" communications channels. Only one bit of information is discussed for each of the phase modulation and amplitude modulation in a simple QAM example, but the groundwork is laid for extending the system. The concept of symbol rate and bit rates is introduced. The importance of frequency and phase synchronization of the receiving Weaver modulator is introduced and examples of issues discussed. The practicing engineer should be able to understand the important issues of QAM digital communication and choose system components in a meaningful way on completion of the course.
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Could have been a little more "concise" in emphasizing what might be considered some "basic truths". Juxtaposition of diagrams to text was excellent. A reference to some real world hardware might have been appropriate in a few places. A few typos still exist.
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This course presents dificult course material well. I graduated in 1968 and was able after about 16-hours complete the course. However, there are a number of typographical errors mostly having to do with figure numbers that make the course more difficult than it should be.
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