Frequency-domain ICI cancellation with MMSE equalization for DS-CDMA downlink

Kazuaki Takeda, Koichi Ishihara, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


Frequency-domain equalization (FDE) based on the minimum mean square error (MMSE) criterion can replace the conventional rake combining while offering significantly improved bit error rate (BER) performance for the downlink DS-CDMA in a frequency-selective fading channel. However, the presence of residual inter-chip-inference (ICI) after FDE produces orthogonality distortion among the spreading codes and the BER performance degrades as the level of multiplexing increases. In this paper, we propose a joint MMSE frequency-domain equalization (FDE) and ICI cancellation to improve the BER performance of the DS-CDMA downlink. In the proposed scheme, the residual ICI replica in the frequency-domain is generated and subtracted from each frequency component of the received signal after MMSE-FDE. The MMSE weight at each iteration is derived taking into account the residual ICI. The effect of the proposed ICI cancellation scheme is confirmed by computer simulation.

Original languageEnglish
Pages (from-to)3335-3343
Number of pages9
JournalIEICE Transactions on Communications
Issue number12
Publication statusPublished - 2006 Dec
Externally publishedYes


  • Frequency-domain equalization
  • ICI cancellation
  • MMSE

ASJC Scopus subject areas

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


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