Pilot-assisted channel estimation for orthogonal multi-carrier DS-CDMA with frequency-domain equalization

Tomoyuki Shima, Hiromichi Tomeba, Fumiyuki Adachi

Research output: Contribution to journalArticlepeer-review


Orthogonal multi-carrier direct sequence code division multiple access (orthogonal MC DS-CDMA) is a combination of time-domain spreading and orthogonal frequency division multiplexing (OFDM). In orthogonal MC DS-CDMA, the frequency diversity gain can be obtained by applying frequency-domain equalization (FDE) based on minimum mean square error (MMSE) criterion to a block of OFDM symbols and can improve the bit error rate (BER) performance in a severe frequency-selective fading channel. FDE requires an accurate estimate of the channel gain. The channel gain can be estimated by removing the pilot modulation in the frequency domain. In this paper, we propose a pilot-assisted channel estimation suitable for orthogonal MC DS-CDMA with FDE and evaluate, by computer simulation, the BER performance in a frequency-selective Rayleigh fading channel.

Original languageEnglish
Pages (from-to)2874-2881
Number of pages8
JournalIEICE Transactions on Communications
Issue number9
Publication statusPublished - 2009 Sept


  • Frequency-domain equalization
  • Orthogonal MC DS-CDMA
  • Pilot-assisted channel estimation


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