US 2011/0075769 A1 · METHOD AND APPARATUS FOR GENERATING SOFT BIT VALUES

Abstract

Teachings presented herein offer reduced and stable computational complexity for symbol block detection using multi-stage assistance, and also provide for the generation of soft bit values. A demodulator generates these soft bit values by forming from a set of candidate symbol combinations, for each group of symbols in a symbol block, a subset of candidate symbol combinations for that group. The demodulator selects from the set the most likely combination, at least one combination that has a complementary bit value for a respective bit value in the most likely combination, and as many of the next most likely combinations not already selected as are needed for the size of the subset to conform to a pre-determined size. The demodulator generates soft bit values by limiting the candidate combinations of symbols considered for a symbol block according to the subsets formed for the groups of symbols in that symbol block.

Claims20

Dependent claims

A method implemented by a demodulator for generating soft bit values for a plurality of symbol blocks, each symbol block being a combination of two or more symbols, comprising:

forming a subset of candidate symbol combinations, for each of one or more groups of symbols in a symbol block, by selecting from a set of candidate symbol combinations for that group:
the most likely candidate symbol combination in said set;
at least one candidate symbol combination which is the most likely in said set that has a complementary bit value for a respective bit value in the most likely candidate symbol combination;
and
as many of the next most likely candidate symbol combinations not already selected as are needed for the size of the subset to conform to a pre-determined size;
and
generating soft bit values for the plurality of symbol blocks based on a joint detection process that limits the candidate combinations of symbols considered for a symbol block according to the one or more subsets formed for the one or more groups of symbols in that symbol block.

4 more elements

A demodulator configured to generate soft bit values for a plurality of symbol blocks, each symbol block comprising a combination of two or more symbols, comprising:

one or more assisting detectors and a final assisting detector, at least one of which is configured to form a subset of candidate symbol combinations, for each of one or more groups of symbols in a symbol block, by selecting from a set of candidate symbol combinations for that group:
the most likely candidate symbol combination in said set;
at least one candidate symbol combination which is the most likely in said set that has a complementary bit value for a respective bit value in the most likely candidate symbol combination;
and
as many of the next most likely candidate symbol combinations not already selected as are needed for the size of the subset to conform to a pre-determined size;
and
a detector configured to generate soft bit values for the plurality of symbol blocks based on a joint detection process that limits the candidate combinations of symbols considered for a symbol block according to the one or more subsets formed for the one or more groups of symbols in that symbol block.

4 more elements

Dependencies are inferred from the claim text.

Method and apparatus for generating soft bit values

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Method and apparatus for generating soft bit values

Life of this patent

Abstract

Claims20