Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2007-05-29
2007-05-29
Ghayour, Mohammed (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S261000, C375S341000, C375S213000, C375S213000
Reexamination Certificate
active
10422083
ABSTRACT:
A method and apparatus for decoding trellis-coded digital data. Digital data samples that have been convolutionally encoded by trellis-coded modulation (TCM) for purposes of forward error correction require a computationally intensive Viterbi decoder for best performance. A technique known as pragmatic trellis-code modulation (PTCM) reduces decoder complexity but at the expense of degraded performance in some situations. This disclosure provides a solution that retains the reduced complexity of PTCM, but uses a full trellis approach that yields significantly better performance in terms of bit error rate (BER).
REFERENCES:
patent: 6233712 (2001-05-01), Rhee et al.
patent: 6366624 (2002-04-01), Balachandran et al.
A.J. Viterbi et al., “A Pragmatic Approach to Trellis-Coded Modulation.” Jul. 1989 IEEE Communications Magazine, pp. 11-19.
M.D. Ross et al., “Pragmatic Trellis Coded Modulation: A Hardware Implementation Using 24-Sector 8-PSK,” ICC '92, pp. 1578-1582.
J.K. Wolf et al., “p2 Codes: Pragmatic Trellis Codes Utilizing Punctured Convolutional Codes,” Feb. 1995 IEEE Communications Magazine, pp. 94-98.
Enserink Scott W.
Holmes Michael J.
Long Jeffrey P.
File Erin M.
Ghayour Mohammed
Northrop Grumman Corporation
Tarolli, Sundheim Covell & Tummino LLP
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