Simplified multiaccess interference reduction for MC-CDMA with carrier frequency offsets

Layla Tadjpour*, Shang-Ho Tsai, C. C.Jay Kuo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Multicarrier code-division multiple-access (MC-CDMA) system performance can severely be degraded by multiaccess interference (MAI) due to the carrier frequency offset (CFO). We argue that MAI can more easily be reduced by employing complex carrier interferometry (CI) codes. We consider the scenario with spread gain $N$, multipath length $L$ , and $N$ users, i.e., a fully loaded system. It is proved that, when CI codes are used, each user only needs to combat $2(L - 1)$ (rather than $N - 1$) interferers, even in the presence of CFO. It is shown that this property of MC-CDMA with CI codes in a CFO channel can be exploited to simplify three multiuser detectors, namely, parallel interference cancellation (PIC), maximum-likelihood, and decorrelating multiuser detectors. The bit-error probability (BEP) for MC-CDMA with binary phase-shift keying (BPSK) modulation and single-stage PIC and an upper bound for the minimum error probability are derived. Finally, simulation results are given to corroborate theoretical results.

Original languageEnglish
Article number5409560
Pages (from-to)2543-2555
Number of pages13
JournalIEEE Transactions on Vehicular Technology
Volume59
Issue number5
DOIs
StatePublished - 1 Jun 2010

Keywords

  • Carrier frequency offset
  • Complexity reduction
  • Decorrelating detection
  • Interferometry codes
  • Maximum likelihood detection
  • Multiaccess interference
  • Multicarrier codedivision multiple-access (MC-CDMA)
  • Multiuser detection
  • Orthogonal codes
  • Parallel interference cancellation

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