Determination of cyclic delay for CDD utilizing RMS delay spread in OFDMA multiuser scheduling systems

Seong Ho Hur, Min Joong Rim, Bhaskar D. Rao, James R. Zeidler

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

The multiuser diversity gain increases with the degree and dynamic range of channel fluctuations. For a multi-antenna orthogonal frequency division multiplexing (OFDM) system operating in a channel with limited fluctuations, cyclic delay diversity (CDD) was proposed to increase frequency selectivity. This is achieved by introducing a cyclic delay between the different transmit antennas thereby increasing the effective number of paths in the resulting channel. In this paper, for a multiuser system, we propose a scheme to determine peruser optimal cyclic delay value based on the knowledge of the root-mean-square (RMS) delay spread of the channel. We show that the proposed technique achieves better performance than a conventional fixed cyclic delay scheme and that the throughput is very close to the optimal sum rate possible with CDD.

Original languageEnglish
Title of host publicationConference Record of the 44th Asilomar Conference on Signals, Systems and Computers, Asilomar 2010
Pages506-510
Number of pages5
DOIs
StatePublished - 2010
Event44th Asilomar Conference on Signals, Systems and Computers, Asilomar 2010 - Pacific Grove, CA, United States
Duration: 7 Nov 201010 Nov 2010

Publication series

NameConference Record - Asilomar Conference on Signals, Systems and Computers
ISSN (Print)1058-6393

Conference

Conference44th Asilomar Conference on Signals, Systems and Computers, Asilomar 2010
Country/TerritoryUnited States
CityPacific Grove, CA
Period7/11/1010/11/10

Keywords

  • CDD
  • Multiuser diversity
  • OFDMA

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