Linearly precoded or coded OFDM against wireless channel fades?

Zhengdao Wang, G. B. Giannakis

Research output: Chapter in Book/Report/Conference proceedingConference contribution

130 Scopus citations

Abstract

Orthogonal frequency division multiplexing (OFDM) converts a dispersive channel into parallel subchannels and thus facilitates equalization. But when the channel has nulls close to or on the FFT grid, OFDM faces serious symbol recovery problems. As an alternative to various error-control coding techniques that have been proposed to ameliorate the problem, we linearly precode (LP) symbols before they are multiplexed. We identify the maximum achievable diversity order for iid or correlated Rayleigh fading channels and also provide design rules for achieving maximum diversity gains with LP-OFDM. Simulated performance comparisons of LP-OFDM with existing block and convolutionally coded OFDM alternatives favor LP-OFDM in a HiperLan2 experiment.

Original languageEnglish (US)
Title of host publication2001 IEEE 3rd Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2001
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages267-270
Number of pages4
ISBN (Electronic)0780367200
DOIs
StatePublished - Jan 1 2001
Event3rd IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2001 - Taoyuan, Taiwan, Province of China
Duration: Mar 20 2001Mar 23 2001

Publication series

NameIEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC
Volume2001-January

Other

Other3rd IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2001
CountryTaiwan, Province of China
CityTaoyuan
Period3/20/013/23/01

Keywords

  • AWGN
  • Convolution
  • Convolutional codes
  • DSL
  • Digital video broadcasting
  • Dispersion
  • Diversity methods
  • Fading
  • OFDM
  • Transmitters

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