Performance evaluation of asynchronous multicarrier CDMA systems with frequency offsets and correlated fading

Feng-Tsun Chien*, C. C Jay Kuo

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review


The effects of frequency offsets and aperiodic random spreading sequences on the performance of asynchronous multicarrier code division multiple access (CDMA) systems with correlated fading are investigated in this research. Random parameters including asynchronous delays, correlated Rayleigh fading and spreading sequences are averaged to determine the covariance matrix of the interference-plus-noise vector. An analytic expression for the average signal-to-interference-plus-noise ratio (SINK) is obtained. Furthermore, average bit error probability (BEP) based on the Gaussian approximation is also derived. We show that the system degrades significantly if the frequency offset of the desired user is present, while the system is insensitive to interferers' frequency offsets. In consequence, it is crucial to estimate and compensate the desired user's synchronization imperfection. Finally, design tradeoff among the number of sub-carriers, fading correlations, and inter-carrier interference (ICI) are presented in simulation results.

Original languageEnglish
Article number01
Pages (from-to)9-20
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1 Dec 2004
EventDigital Wireless Communications VI - Orlando, FL, United States
Duration: 12 Apr 200413 Apr 2004


  • Carrier frequency offset
  • Code division multiple access (CDMA)
  • Direct sequence-CDMA (DS-CDMA)
  • Inter-carrier interference (ICI)
  • Multicarrier-direct sequence-CDMA (MC-DS-CDMA)

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