Joint frequency-domain equalization and despreading for DS-CDMA cyclic delay transmit diversity

Tetsuya Yamamoto, Kazuki Takeda, Fumiyuki Adachi

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

Abstract

Cyclic delay transmit diversity (CDTD) using frequency-domain equalization (FDE) based on the minimum mean squire error (MMSE) criterion is a powerful technique to improve the bit error rate (BER) performance of direct sequence code division multiple access (DS-CDMA) signal transmission in a frequency-selective fading channel. CDTD simultaneously transmits the same signal from different antennas after adding different cyclic delays to increase the number of equivalent propagation paths and hence achieves the larger frequency diversity gain. However, the BER performance of DS-CDMA with CDTD using MMSE-FDE is limited by the residual inter-chip interference (ICI) after FDE. In this paper, we propose a new joint FDE and despreading suitable for CDTD, which can simultaneously perform equalization and despreading in the frequency-domain. We evaluate the achievable BER performance by computer simulation. copyright

Original languageEnglish
Title of host publication2008 14th Asia-Pacific Conference on Communications, APCC 2008
Publication statusPublished - 2008 Dec 1
Event2008 14th Asia-Pacific Conference on Communications, APCC 2008 - Akihabara, Tokyo, United States
Duration: 2008 Oct 142008 Oct 16

Publication series

Name2008 14th Asia-Pacific Conference on Communications, APCC 2008

Other

Other2008 14th Asia-Pacific Conference on Communications, APCC 2008
CountryUnited States
CityAkihabara, Tokyo
Period08/10/1408/10/16

Keywords

  • Cyclic delay transmit diversity
  • DS-CDMA
  • Frequency-domain equalization

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Communication

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