Soft decision decoder, and log likelihood ratio calculator...

Details Soft decision decoder, and log likelihood ratio calculator... Soft decision decoder, and log likelihood ratio calculator...

2008-01-22

2008-01-22

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S340000

Reexamination Certificate

active

07321643

ABSTRACT:
Disclosed is a soft decision decoder, and a log likelihood ratio calculator for soft decision decoding and a method thereof, for realizing a generalized log likelihood ratio algorithm in consideration of channel estimation errors for performing soft decision decoding on QAM signals, which comprises multipliers for multiplying reference signals and channel estimation signals, subtractors for subtracting a receive signal of a receiver from output signals of the multipliers, first and second square calculators for squaring the subtractors' output signals and reference signals, dividers for dividing output signals of the first and second square calculators by addition values, and a comparator for comparing output signals of the dividers.

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patent: 2006/0078075 (2006-04-01), Stamoulis et al.
patent: 1020010010277 (2001-02-01), None
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Wang et al., “Soft Decision Generation for QAM with Channel Estimation Error,”IEEE Transaction on Communications, vol. 50, No. 7, Jul. 2002, pp. 1058-1061.
Mustapha, “On Reliability Metrics for Soft-Input Decoding in Presence of Channel estimation Errors,” IEEE, 2006, pp. 2548-2552.
IEEE Journal on Selected Areas in Communications, vol. 16, No. 2, Feb. 1998, pp. 276-296.

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