Performance evaluation of data transmission over multicarrier CDMA systems

Feng Tsun Chien, Chien Hwa Hwang, Chang Su Kim, C. C.Jay Kuo

Research output: Contribution to journalArticle

Abstract

The performances of direct sequence-code division multiple access (DS-CDMA), multicarrier-CDMA (MC-CDMA) and multicarrier-direct sequence-CDMA (MC-DS-CDMA) systems under different channel conditions are compared in this work. In a frequency-selective slowly fading channel, MC-CDMA and MC-DS-CDMA outperform DS-CDMA, since the former two systems partition the frequency band into sub-channels, each of which has a nearly constant frequency response. Thus, MC-CDMA and MC-DS-CDMA do not suffer much from the multipath effect. The performance of MC-CDMA and MC-DS-CDMA can be further differentiated in severe fading conditions. In a frequency-selective fast fading channel, the larger spreading ratio of MC-DS-CDMA in the time domain prevents the chip duration of a sub-carrier from being longer than the channel coherence time. Hence, the sub-carrier orthogonality is maintained in MC-DS-CDMA, leading to its better performance in this case.

Original languageEnglish
Pages (from-to)42-52
Number of pages11
JournalProceedings of SPIE-The International Society for Optical Engineering
Volume4740
DOIs
Publication statusPublished - 2002 Jan 1

Keywords

  • Code division multiple access (CDMA)
  • Direct sequence-CDMA (DS-CDMA)
  • Frequently-selective
  • Multicarrier-CDMA (MC-CDMA)
  • Multicarrier-direct sequence-CDMA (MC-DS-CDMA)
  • Rayleigh fading channel
  • Time-selective

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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