Efficient decoding of trellis coded modulation waveforms

Details Efficient decoding of trellis coded modulation waveforms Efficient decoding of trellis coded modulation waveforms

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.

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