Method and apparatus for determining the log-likelihood...

Details Method and apparatus for determining the log-likelihood... Method and apparatus for determining the log-likelihood...

2007-05-15

2007-05-15

Kumar, Pankaj (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S341000

Reexamination Certificate

active

10305587

ABSTRACT:
An apparatus and method for recovering data transmitted in a wireless communication system is claimed. A plurality of signal points, the signal point including a plurality of modulation symbols from a plurality of coded bits, is received. A first subset of signal points for which a bit is equal to a first value and a second subset of signal points for which the bit is equal to a second value is determined. The first and second subsets are signal points from an expanded signal constellation. The probability that the bit is equal to the first value or the second value is determined as a function of the received signal point. A soft decision symbol may then be determined, based on the probability that the bit is equal to the first value or the second value. The soft decision symbols may be represented as log likelihood ratios.

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