| 摘要 |
A decision feedback channel equalizer of a digital receiver includes a feedforward filter to receive and filter a demodulated signal to remove one or more ghost signals, a hard decision unit to decide a decision value based on a first signal outputted from the feedforward filter, a feedback filter to receive and filter the decision value, and to output a second signal, and a hard decision error estimator to estimate a hard decision error rate based on the demodulated signal, the first signal and the decision value, and to control the equalizer to update tap coefficients of the feedforward filter and the feedback filter according to the hard decision error rate. Accordingly, the tap coefficients of the feedforward filter and the feedback filter may be adjusted adaptively based on the hard decision error rate.
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