Method and apparatus for computing soft decision input...

Details Method and apparatus for computing soft decision input... Method and apparatus for computing soft decision input...

2007-02-06

2007-02-06

Ha, Dac (Department: 2611)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S341000, C375S280000

Reexamination Certificate

active

10600889

ABSTRACT:
A method and apparatus for computing soft decision input metrics to a turbo decoder includes circuits associated with eight-ary phase shift keyed (8PSK) modulation and sixteen-ary quadrature amplitude modulation (16QAM). In both implementations log-likelihood ratio (LLR) metrics on code symbols are estimated as products of various constant values and various combinations of the in-phase and quadrature components of a demodulated soft decision. In the implementation associated with the 16QAM modulation scheme, an estimate of the carrier-signal-to-interference (C/I) ratio is also used to estimate some of the LLR metrics. Estimates of the LLR metrics may also be obtained in association with generalized square QAM and M-ary PSK modulation schemes including, e.g., 64QAM, 256QAM, and 16PSK.

REFERENCES:
patent: 5657354 (1997-08-01), Thesling et al.
patent: 5805017 (1998-09-01), Razzell

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