Cyclic delay diversity with linear precoding technique adopted in OFDM systems

Bing Hui, Kyung Hi Chang

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

1 Scopus citations

Abstract

Cyclic delay diversity (CDD) is considered a simple approach to exploit the frequency diversity, to improve the system performance in orthogonal frequency division multiplexing (OFDM) systems. Also, the linear precoding technique can significantly improve the performance of communication systems by exploiting the channel state information (CSI). In order to achieve enhanced performance, we propose applying linear precoding to the conventional CDD-OFDM transmit diversity schemes over Rayleigh fading channels. The proposed scheme works effectively with the accurate CSI in time-division-duplex (TDD) OFDM systems with CDD, where the reciprocity is assumed instead of channel state feedback. For a bit error rate (HER) of 10-4 and the mobility of 3 km/h, simulation results show that a gain of 6 dB is achieved by the proposed scheme over both flat fading and Pedestrian A (Ped A) channels, compared to the conventional CDD-OFDM system. On the other hand, for a mobility of 120 km/h, a gain of 2.7 dB and 3.8 dB is achieved in flat fading and Vehicular A (Veh A) channels, respectively.

Original languageEnglish
Title of host publication11th International Conference on Advanced Communication Technology, ICACT 2009 - Proceedings
Pages487-492
Number of pages6
StatePublished - 2009
Event11th International Conference on Advanced Communication Technology, ICACT 2009 - Phoenix Park, Korea, Republic of
Duration: 15 Feb 200918 Feb 2009

Publication series

NameInternational Conference on Advanced Communication Technology, ICACT
Volume1
ISSN (Print)1738-9445

Conference

Conference11th International Conference on Advanced Communication Technology, ICACT 2009
Country/TerritoryKorea, Republic of
CityPhoenix Park
Period15/02/0918/02/09

Keywords

  • Cyclic delay diversity
  • Frequency-division-duplex (FDD)
  • Linear precoding
  • OFDM
  • Reciprocity
  • TDD

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