Channel capacity of MC-CDMA and impact of residual ICI

Koichi Adachi, Fumiyuki Adachi, Masao Nakagawa

Research output: Contribution to journalArticlepeer-review


Orthogonal frequency division multiplexing (OFDM), which uses a number of narrowband orthogonal sub-carriers, is a promising transmission technique. Also multi-carrier code division multi-access (MC-CDMA), which combines OFDM and frequency-domain spreading, has been attracting much attention as a future broadband wireless access. It was shown that MC-CDMA has lower channel capacity than OFDM, due to inter-code interference (ICI) resulting from orthogonality distortion caused by frequency-selective fading. Recently, many ICI cancellers have been proposed to mitigate the effect of ICI. In this paper, we derive a channel capacity expression for MC-CDMA assuming perfect ICI cancellation taking into account both frequency diversity gain and space diversity gain and compare it to that of OFDM. Furthermore, we derive a channel capacity expression for the case of imperfect ICI cancellation to discuss the impact of the residual ICI.

Original languageEnglish
Pages (from-to)219-227
Number of pages9
JournalIEICE Transactions on Communications
Issue number1
Publication statusPublished - 2009


  • Channel capacity
  • ICI cancellation
  • Theoretical study

ASJC Scopus subject areas

  • Software
  • Computer Networks and Communications
  • Electrical and Electronic Engineering

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