Asymptotic performance of transmit diversity via OFDM for multipath channels

Nadeem Ahmed, Richard G. Baraniuk

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

3 Scopus citations

Abstract

Many wireless systems exploit transmit diversity for more reliable detection of signals at the receiver. To accomplish this, coding is spread across multiple transmit antennas. An example of this is the well known "Alamouti transmit diversity", where a very simple coding scheme across multiple transmit antennas allows systems to attain performance similar to systems with multiple receive antennas. The major drawback is that this system only works when a "flat-fading" model for the channel is assumed; when used in a multipath environment, the system breaks down. Here we show that when the Alamouti code is placed within an OFDM structure, using adjacent frequency bands rather than consecutive symbol intervals, it can asymptotically achieve the same performance in multipath fading as the Alamouti code in flat-fading.

Original languageEnglish
Title of host publicationConference Record / IEEE Global Telecommunications Conference
Pages691-695
Number of pages5
Volume1
StatePublished - Dec 1 2002
EventGLOBECOM'02 - IEEE Global Telecommunications Conference - Taipei, Taiwan, Province of China
Duration: Nov 17 2002Nov 21 2002

Other

OtherGLOBECOM'02 - IEEE Global Telecommunications Conference
CountryTaiwan, Province of China
CityTaipei
Period11/17/0211/21/02

Keywords

  • Frequency selective fading
  • Multicarrier
  • Multipath
  • OFDM
  • Transmit diversity

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Global and Planetary Change

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