A Comparison of Timing Methods in Orthogonal Frequency Division Multiplexing (OFDM) Systems

Abstract

Orthogonal frequency division multiplexing (OFDM) is being used by wireless local area network (WLAN) standards, such as IEEE 802.11a, and wireless metropolitan area network (MAN) standards, such as IEEE 802.16a. OFDM is a very efficient communications scheme for wireless ADHOC networks. However, the wireless environment causes inter-symbol interference (ISI) and inter-carrier interference (ICI). Estimating the starting point of an OFDM symbol must be handled efficiently and effectively to reduce the errors. OFDM must be time synchronized to prevent inter-symbol interference (ISI) and inter-carrier interference (ICI). Many techniques exist to realize timing synchronization in OFDM systems. In this thesis, the need for timing synchronization, the timing errors, and the performance of different techniques under a variety of mobile channel models (indoor and outdoor) are investigated, and simulation performance results for each technique under different channel models are presented.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2004
Accession Number
ADA427440

Entities

People

  • Ersoy Oz

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Channel Models
  • Coding
  • Communication Channels
  • Communication Systems
  • Decoding
  • Digital Communications
  • Doppler Effect
  • Electrical Engineering
  • Local Area Networks
  • Mobile Communications
  • Modulation
  • Modulators
  • Multiple Access
  • Multiplexing
  • Orthogonal Frequency Division Multiplexing
  • Simulations
  • Wireless Communications

Fields of Study

  • Engineering

Readers

  • Radio communications and signal processing.