Dual-Mode Equalizer in an Atsc-Dtv Receiver
AssigneeThomson Licensing
InventorIvonete Markman
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Abstract
A decision feedback equalizer for processing a data signal provides concurrent equalizer outputs (Zok, Z1k) for hard decision directed and soft decision directed modes. The joint architecture in accordance with the present invention takes advantage of the fact, herein recognized, that for each equalizer output symbol soft decision bit representation, a subset of these bits corresponds to the hard decision representation. As a result, the invention permits the concurrent output of two distinct modes with essentially the same hardware as a one output equalizer.
Claims43
A receiver, comprising:
- an equalizer that has at least two coefficient modes of operation;
- wherein in a first coefficient mode, the equalizer starts with a preset non-zero value in at least one tap;
- while in a second coefficient mode, the equalizer starts such that all taps are set equal to the same value.
A method for use in a receiver, the method comprising:
- setting an equalizer to one of a number of coefficient modes of operation;
- and
- equalizing a signal in accordance with the set coefficient mode;
- wherein in a first coefficient mode, the equalizer starts with a preset non-zero value in at least one tap;
- while in a second coefficient mode, the equalizer starts such that all taps are set equal to the same value.
Dependencies are inferred from the claim text.