Software definable block adaptive decision feedback equalizer
AssigneeKoninklijke Philips Electronics N.V.
InventorKrishnamurthy Vaidyanathan
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Abstract
A block decision feedback equalizer is designed by deriving, from first principles, a block exact decision feedback equalizer and then systematically applying simplifying assumptions to obtain several block approximate decision feedback equalizers, each suitable for multipath channel equalization and having error convergence insensitive to filter length. The resulting block decision feedback equalizer is software definable may be dynamically adapted by choosing whether to update error correction coefficients.
Claims20
A block decision feedback equalizer for channel equalization comprising:
- a forward filter receiving and concurrently processing blocks containing input samples;
- a feedback filter receiving and concurrently processing blocks containing demapped equalized output samples;
- and
- a signal adder combining filtered input samples for a current block from the forward filter, filtered output samples for the current block from the feedback filter, and intra-block time varying output correction coefficients for the forward filter to produce equalized output samples for the current block.
A receiver comprising:
- an input for receiving an input signal;
- a channel decoder for decoding the input signals;
- and
- a block decision feedback equalizer within the channel decoder for channel equalization comprising:
- a forward filter receiving and concurrently processing blocks containing input samples from the input signal;
- a feedback filter receiving and concurrently processing blocks containing demapped equalized output samples;
- and
- a signal adder combining filtered input samples for a current block from the forward filter, filtered output samples for the current block from the feedback filter, and intra-block time varying output correction coefficients for the forward filter to produce equalized output samples for the current block.
A method of block channel equalization comprising:
- receiving and concurrently processing blocks containing input samples within a forward filter;
- receiving and concurrently processing blocks containing demapped equalized output samples within a feedback filter;
- and
- combining filtered input samples for a current block from the forward filter, filtered output samples for the current block from the feedback filter, and intra-block time varying output correction coefficients for the forward filter within a signal adder to produce equalized output samples for the current block.
Dependencies are inferred from the claim text.