Fast soft value computation methods for gray-mapped QAM

Details Fast soft value computation methods for gray-mapped QAM Fast soft value computation methods for gray-mapped QAM

2008-01-01

2008-01-01

Ghayour, Mohammed (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S316000, C455S060000, C370S902000, C329S304000

Reexamination Certificate

active

07315578

ABSTRACT:
A method and apparatus use unified equations to provide computationally efficient but exact solutions to bit soft value computations for Gray-coded QAM symbols in a received communication symbol as compared to carrying out region-specific equations that are keyed to particular regions of a nominal modulation constellation. Such unified equations further may include one or more correction terms that compensate the bit soft value computations for the effects on symbol samples of more than one “nearest” neighbor in the nominal modulation constellation. While the computations offer particular advantages for receivers making use of the HS-DSCHs used in WCDMA, the method and apparatus can be used in essentially any wireless receiver or system employing Gray-coded QAM.

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