Patent ID: 7346105

Claim:
In a communications receiver having a decision feedback equalizer filter, the communications receiver responsive to a received signal that is over-sampled with respect to a symbol rate, an apparatus comprising: a forward filter that receives the over-sampled signal and is adaptive based on a first feedback signal; a first adder that sums an output of the forward filter with a second feedback signal to produce a new over-sampled signal; a de-interleaver, clocked at an over-sampling rate associated with the over-sampled signal, that receives the new over-sampled signal; a slicer, coupled to the de-interleaver, for quantizing on-baud samples from the new over-sampled signal; an estimator, coupled to receive off-baud samples from the de-interleaver and receive the guantized samples from the slicer, for calculating approximate mid-level voltages for off-baud samples from the new over-sampled signal; an error term calculator, coupled to receive the on-baud samples and the quantized samples from the new over-sampled signal, for calculating the first feedback signal; an interleaver, clocked at the over-sampling rate, and coupled to the de-interleaver, wherein the interleaver receives the quantized samples and receives off-baud samples from the new over-sampled signal; and a feedback filter coupled to receive an output signal from the interleaver and to produce the second feedback signal for the first adder, wherein the feedback filter is adaptive based on the first feedback signal from the error term calculator.