Maximum likelihood a posteriori probability detector

A communication device comprising:

• a maximum likelihood a posteriori probability (ML-APP) detector for generating at least a subset of symbol candidates, at least W log likelihood ratio (LLR) units configured to perform a conversion operation on candidates from the subset of symbol candidates to generate additional symbol candidates and calculate a cost by comparing a received symbol to all of the generated symbol candidates, wherein the at least W LLR units operate in staggered fashion, where W is an integer equal to V/U where V represents the number of clock cycles that elapses during a conversion operation by an LLR unit and U is an integer equal to the number of clock cycles that elapses between reception of symbols by the LLR units;
• and
• at least two antennas coupled to the detector.

A communication device comprising:

• a maximum likelihood a posteriori probability (ML-APP) detector for generating at least a subset of symbol candidates, at least one LLR unit configured to perform a conversion operation on candidates from the subset of symbol candidates to generate additional symbol candidates and calculate a cost by comparing a received symbol to all of the generated symbol candidates, the at least one LLR unit determines hard decision values for each bit position of a selected symbol candidate, the hard decision values are based on soft information associated with the selected symbol candidate, the soft information is generated by the at least one LLR unit;
• and
• at least two antennas coupled to the detector.

A communication device comprising:

• a maximum likelihood a posteriori probability (ML-APP) detector for generating at least a subset of symbol candidates, at least one LLR unit configured to perform a conversion operation on candidates from the subset of symbol candidates to generate additional symbol candidates and calculate a cost by comparing a received symbol to all of the generated symbol candidates, wherein the ML-APP detector comprises at least one Hx unit coupled to the at least one LLR unit, the at least one Hx unit is configured to generate at least the subset of symbol candidates, the at least one Hx unit and the at least one LLR unit operate in synchronization with a clock;
• and
• at least two antennas coupled to the detector.

A communication device comprising:

• a maximum likelihood a posteriori probability (ML-APP) detector for generating at least a subset of symbol candidates, at least one LLR unit configured to perform a conversion operation on candidates from the subset of symbol candidates to generate additional symbol candidates and calculate a cost by comparing a received symbol to all of the generated symbol candidates, wherein the subset of symbol candidates to be converted by the at least one LLR unit are obtained from an Hx register coupled to a Hx unit, the Hx register stores the generated symbol candidates created from an H matrix and a transmit bit pattern generator coupled to the Hx unit, and the Hx register is updated when the H matrix has changed;
• and
• at least two antennas coupled to the detector.