Pilot-Assisted Channel Estimation for Orthogonal Multi-Carrier DS-CDMA with Frequency-Domain Equalization

Tomoyuki SHIMA  Hiromichi TOMEBA  Fumiyuki ADACHI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E92-B   No.9   pp.2874-2881
Publication Date: 2009/09/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E92.B.2874
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
Keyword: 
orthogonal MC DS-CDMA,  frequency-domain equalization,  pilot-assisted channel estimation,  

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Summary: 
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.