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Joint detection and channel estimation for block transmission schemes

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3 Author(s)
Coelho, F. ; Dept. de Eng. Electrotec., Univ. Nova de Lisboa, Caparica, Portugal ; Dinis, R. ; Montezuma, P.

SC-FDE (Single-Carrier with Frequency-Domain Equalization) block transmission technique can have excellent performance in severely time-dispersive channels provided that accurate channel estimates are available at the receiver. In this paper we consider joint detection and channel estimation for SC-FDE schemes where a coarse channel estimate is obtained with the help of a training sequence and we employ iterative receivers where for each iteration the data estimates are used to improve the channel estimates. However, since the frequency-domain data blocks can have large envelope fluctuations, a decision-directed channel estimation might have significant noise enhancement effects. To overcome this problem, we combine channel estimates based on the training sequence with decision-directed channel estimates. Our performance results show that these techniques allow good performances without requiring high-power pilots or training blocks.

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Date of Conference:

Oct. 31 2010-Nov. 3 2010