Modified branch metrics for processing soft decisions to...

Details Modified branch metrics for processing soft decisions to... Modified branch metrics for processing soft decisions to...

2006-11-14

2006-11-14

Kim, Kevin (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

C375S265000, C375S317000, C375S322000, C714S796000

Reexamination Certificate

active

07136435

ABSTRACT:
Modified branch metrics for processing bit-soft decisions to account for phase noise impact on cluster variance (CV). The present invention is able to partition a modulation scheme's constellation into two or more regions, so that the bit-soft decision branch metrics may be adjusted based on the CV of the various constellation points. A confidence level may be attached to the various constellation points based on their particular CVs. There are a number of methods to ascertain the CV of the constellation's points, including finding characteristics of various components in a communication system (transmitter, communication channel and receiver), and any method may be used within various embodiments. The modification of the branch metrics/confidence level may be performed in a communication receiver; the communication receiver may be implemented in a communication system employing the vector orthogonal frequency division multiplexing (VOFDM) portion of the broadband wireless internet forum (BWIF).

REFERENCES:
patent: 5710793 (1998-01-01), Greenberg
patent: 6005893 (1999-12-01), Hyll
patent: 6167095 (2000-12-01), Furukawa et al.
patent: 6396803 (2002-05-01), Hornsby et al.
patent: 6463106 (2002-10-01), Prasanna

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