Title page for ETD etd-07232003-144922


Type of Document Master's Thesis
Author Chan, Raymond
Author's Email Address rachan@vt.edu
URN etd-07232003-144922
Title Channel Prediction for Adaptive Modulation in Wireless Communications
Degree Master of Science
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Buehrer, Richard Michael Committee Chair
Pratt, Timothy J. Committee Member
Woerner, Brain D. Committee Member
Keywords
  • Channel Prediction
  • Pilot Symbol Assisted Modulation
  • Rayleigh Fading
  • Forward Error Correction
  • Adaptive Modulation
  • Channel Estimation
  • Linear Prediction
Date of Defense 2003-07-15
Availability unrestricted
Abstract
This thesis examines the benefits of using adaptive modulation and coding in terms of spectral efficiency and probability of bit error. Specifically, we examine the performance enhancement made possible by using linear prediction along with channel estimation in conjunction with adaptive modulation. We begin this manuscript with basic fundamentals of our study, followed by a detailed view of simulations, their results, and our conclusions from them. The study includes simulations in slow and moderately fast flat fading Rayleigh channels.

We present our findings regarding the advantages of using predictive measures to foresee the state of the channel and make adjustments to transmissions accordingly.

In addition to finding the general advantages of channel prediction in adaptive modulation, we explore various ways to adjust the prediction algorithm when we are faced with high Doppler rates and fast fading.

By the end of this work, we should have a better understanding of when channel prediction is most valuable to adaptive modulation and when it is weakest, and how we can alleviate the problems that prediction will have in harsh environments.

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