Partial FFT Demodulation: A Detection Method for Doppler Distorted OFDM Systems

Abstract

In mobile OFDM systems, such as underwater acoustic and digital video broadcasting (DVB) systems, time variation causes severe inter-carrier interference (ICI) which limits data detection performance. To address this problem, a signal processing strategy using several partial-interval FFTs instead of a conventional full-interval single FFT is proposed. Weighted combining of the partial FFT outputs coupled with standard OFDM processing, allows high performance symbol-by-symbol detection even in highly time-varying channels. Numerical examples show performance gains of several dB over a conventional receiver, thus indicating that an order of magnitude reduction in BER is achievable at a minimal increase in complexity.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2010
Accession Number
ADA531988

Entities

People

  • Milica Stojanovic
  • Srinivas Yerramalli
  • Urbashi Mitra

Organizations

  • University of Southern California

Tags

Communities of Interest

  • Human Systems

DTIC Thesaurus Topics

  • Acoustic Communications
  • Algorithms
  • Channel Estimation
  • Computational Complexity
  • Demodulation
  • Demodulators
  • Detection
  • Detectors
  • Filtration
  • Frequency
  • Frequency Bands
  • Frequency Domain
  • Frequency Response
  • Inter-Carrier Interference
  • Intervals
  • Orthogonal Frequency Division Multiplexing
  • Signal Processing

Fields of Study

  • Engineering

Readers

  • Approximation Theory.
  • Radio communications and signal processing.