Approximate soft-information computation in multi-level...

Details Approximate soft-information computation in multi-level... Approximate soft-information computation in multi-level...

2007-11-07

2011-11-15

Ahn, Sam K (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

Reexamination Certificate

active

08059763

ABSTRACT:
Apparatus and methods are provided for calculating soft information in a multi-level modulation scheme using one or more nearest neighbors. The nearest neighbors correspond to signal points in a signal constellation set nearest to the value of a received signal. For the nearest neighbors of a received symbol of information, a detector can determine whether the nearest neighbors have a same bit value at a bit position of the symbol. When the bit values are the same at that bit position, soft information in the form a log-likelihood ratio can be computed based on the nearest neighbors and a predetermined scaling factor. The predetermined scaling factor can be optimized for system performance.

REFERENCES:
patent: 2002/0122510 (2002-09-01), Yakhnich et al.
patent: 2007/0291864 (2007-12-01), Ma et al.

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