| 摘要 |
A channel estimator (300) for obtaining a processed channel estimate for a symbol position in time or frequency using existing channel estimates for a plurality of symbol positions in time or frequency comprises a determinator (310) for determining quality measures describing a reliability of data estimates corresponding to the existing channel estimates of data transmitted in at least two different symbol positions. The channel estimator further comprises a weighter (330) for weighting the quality measures in dependence on filter coefficients of a symbol-position-filter (360) to derive a weighted quality measure, wherein the coefficients of the symbol-position-filter are adapted so that filtered channel estimates are less affected by channel distortions than channel estimates before filtering with the symbol-position-filter. Besides, the channel estimator comprises a comparator (340) for comparing the weighted quality measure with a threshold value, and a processor for obtaining the processed channel estimate by filtering, using the filter coefficients, at least two channel estimates from the existing channel estimates, if the weighted quality measure indicates reliability exceeding a reliability threshold. The channel estimator can be implemented as a computer program. The channel estimator allows for an improved iterative channel estimation when compared to conventional channel estimators.
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