Digital Communications Part 2: Advanced Topics

EC ENGR 715.02

In this 2-hour webinar you will be learning to follow an orderly approach when characterizing multipath systems.  You will learn how to use advanced OFDM techniques to mitigate the degrading effects of multipath.


What you can learn.

  • Understand how to characterize fading and what is required to mitigate its degrading effects
  • Gain insight into an efficient signal-processing technique, OFDM
  • Discover the intricacies of OFDM, starting with its time-frequency description
  • Identify the importance of the cyclic prefix (CP)
  • Assess how OFDM waveforms are synthesized
  • Determine why we need to transform Linear Convolution into Circular Convolution

About this course:

The degrading effects of a fading (or multipath) channel stem from the multiple echoes that might be received for each transmitted symbol.  With an ordinary receiver, such echoes often result in distortion due to inter-symbol interference (ISI).  In this course, we characterize the various types of fading:  frequency-selective and flat fading, fast and slow fading.  A classical mitigation method for such fading is a RAKE receiver within a spread-spectrum system.  The receiver effectively "rakes in" individual echoes and then coherently combines them.  In this course, we emphasize a more elegant application:  Orthogonal Frequency Division Multiplexing (OFDM) which can mitigating the deleterious effects of fading.  We examine the intricacies of OFDM, and the clever “tricks” that have been designed into it.  Also, we focus on OFDM’s special variant, Single-Carrier OFDM (SC-OFDM).  We look at successful design examples, such as OFDM in WiFi, and LTE.

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