Phase Errors and Doppler Effect in Digital Communications

Abstract

The rollout of IEEE 802.16e for high speed mobile communications poses challenges to the design of equalizers for a time-varying multipath fading channel. This thesis investigates the effects of Doppler shift induced phase error in a wireless environment. It presents the performance of QPSK and MQAM waveforms with Doppler in a Rayleigh channel condition. It investigates the performance of ideal coherent modulation and pilot symbol-aided modulation in a Rayleigh channel with Doppler phase errors. The degradation in performance of pilot symbol-aided demodulation as compared to ideal coherent demodulation is presented. The study concludes with results of simulations of QPSK and MQAM waveforms in a Rayleigh Channel with Doppler phase errors.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2007
Accession Number
AD1185843

Entities

People

  • Chee Wai Ng

Organizations

  • Naval Postgraduate School

Tags

DTIC Thesaurus Topics

  • Bandwidth
  • California
  • Communications Techniques
  • Computers
  • Demodulation
  • Digital Communications
  • Doppler Effect
  • Engineering
  • Frequency
  • Mobile Communications
  • Mobile Phones
  • Modulation
  • Modulators
  • Multiple Access
  • Simulations
  • Simulators
  • Waves
  • Wireless Communications
  • Wireless Networks

Fields of Study

  • Engineering

Readers

  • Radio communications and signal processing.