079-DSSS Digital Communication
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 signal and system concepts are reviewed for comparison and contrast.
The course develops the theory and practical issues and examples leading up to Direct Sequence Spread Spectrum (DSSS) Communication. The information theoretic foundation for trading bandwidth and improved Signal-to-Noise Ratio (SNR) is introduced mathematically, but other useful properties associated with particular spreading sequence properties are introduced by example. The gradual development based on the Weaver architecture for frequency translation of single-sideband, suppressed carrier signals through digital QPSK examples into pseudo-noise (PN) sequence spreading of QPSK of sub-carrier sidebands and finally to direct-sequence, spread-spectrum QPSK is employed to build awareness of the relationships between the spectral energy and the modulation processes. The PN sequence generation, its auto-correlation and cross-correlation attributes are introduced and employed in example with a justification for the development of the matched-filter/correlator approach to sequence de-spreading. Some issues of carrier synchronization and problems are introduced but not developed in detail. Finally, the statistical properties of the correlator approach are shown to be the basis for Code-Division, Multiple Access (CDMA) spectrum sharing to ameliorate the extra bandwidth occupied by the spreading.
The practicing engineer should be able to understand the important issues of DSSS digital communication and choose system components in a meaningful way on completion of the course.
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Excellent material and course organization with many examples that support text.
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Excellent course. However, some of the equations are "tricky". For example, Shannons equations does is not proportional to S/N by the definition of proportionality - x = Ky. Only after you make the asssumption S<
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Only recommended for EE's with a strong background in theoretical communications. I would consider this course to be at the advanced graduate level.
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