Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2007-02-06
2007-02-06
Phu, Phuong (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S262000, C375S265000, C375S341000, C714S792000, C714S794000, C714S795000
Reexamination Certificate
active
09816810
ABSTRACT:
A Viterbi decoding system interprets bits in received QAM constellations as many-valued parameters rather than binary valued parameters. It performs the Viterbi algorithm using these many-valued parameters to provide results superior to hard decision decoding. Rather than applying a hard 0-1 function to the QAM data, the system uses a non-stepped linear or curved transfer function to assign values to the bits. In another aspect, a system differentiates between data bits based on their estimated reliability, giving more emphasis to decoding reliable bits than unreliable bits using any of a variety of techniques. By differentiating between god and bad bits and de-emphasizing or ignoring unreliable bits, the system can provide a significant reduction in uncorrectable errors and packet loss.
REFERENCES:
patent: 6158041 (2000-12-01), Raleigh et al.
patent: 6353637 (2002-03-01), Mansour et al.
patent: 6442130 (2002-08-01), Jones et al.
Gilbert Jeffrey M.
Hustad Paul J.
McFarland William J.
Tehrani Ardavan M.
Thomson John S.
Atheros Communications Inc.
Bever Hoffman & Harms LLP
Harms Jeanette S.
Phu Phuong
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