Pilot-assisted channel estimation based on MMSE criterion for DS-CDMA with frequency-domain equalization

Kazuaki Takeda, Fumiyuki Adachi

Research output: Contribution to journalConference articlepeer-review

14 Citations (Scopus)


The bit error rate (BER) performance of DS-CDMA in a frequency-selective fading channel can be significantly improved by the use of frequency-domain equalization (FDE). Accurate estimation of the channel transfer function is necessary for FDE. Direct application of pilot-assisted channel estimation (CE) degrades the BER performance, since the frequency spectrum of the pilot chip sequence is not constant over the spreading bandwidth. In this paper, we propose a pilot-assisted frequency-domain CE based on minimum mean square error (MMSE) criterion. The BER performance with MMSE-CE in a frequency-selective Rayleigh fading channel is evaluated by computer simulation. It is found that MMSE-CE always provides a good BER performance irrespective of the choice of pilot chip sequence. For a spreading factor SF of 16, the Eb/N0 degradation with MMSE-CE from the ideal CE case is as small as 0.4 dB at BER=10-4 (a 0.28 dB loss due to the pilot insertion is included).

Original languageEnglish
Pages (from-to)447-451
Number of pages5
JournalIEEE Vehicular Technology Conference
Issue number1
Publication statusPublished - 2005
Event2005 IEEE 61st Vehicular Technology Conference -VTC 2005 - Spring Stockholm: Paving the Path for a Wireless Future - Stockholm, Sweden
Duration: 2005 May 302005 Jun 1


  • Channel estimation
  • Frequency-domain equalization
  • MMSE criterion


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