Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2008-05-27
2008-05-27
Burd, Kevin (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
Reexamination Certificate
active
07379504
ABSTRACT:
A wireless device and system employs a two-dimensional (2-D) Trellis code that can be applied to Quadrature Phase Shift Keying (QPSK) and higher order Quadrature Amplitude Modulation (QAM) constellations. The Trellis codes employed have optimal Euclidean distance properties for QPSK constellations, and have very good Euclidean distance properties for higher-order QAM constellations. The Trellis codes are suited for transmission systems that adopt multi-mode QPSK and QAM constellations with different data rates since the same Trellis code can be applied to all modulation formats and the same decoder can be used at the receiver for all modulation formats. Modulation formats include QPSK, 8-QAM, 16-QAM, 32-QAM, and 64-QAM and may be extended to even higher order modulations formats.
REFERENCES:
patent: 5621761 (1997-04-01), Heegard
Ungerboeck G; “Trellis-Coded Modulation with Redundant Signal Sets Part II: State of the Art”, IEEE Communication Magazine, vol. 25, No. 2, Feb. 1, 1987, pp. 12-21, IEEE, Piscataway, Nj.
Heegard C et al: “Practical Coding for QAM Transmission of HDTV”, IEEE Journal on Selected Areas in Communications, vol. 11, No. 1, 1993, pp. 111-1118, XP000378002, IEEE, New York, US.
Ungerboeck G: “Trellis-Coded Modulation with Redundant Signal Sets Part II: State of the Art”, IEEE Communications Magazine, vol. 25, No. 2, Feb. 1, 1987, pp. 12-21 XP000565140, IEEE, Piscataway, NJ, US.
Chan F. et al.: “Performance of punctured trellis coded modulation over fading channels” Vehicular Technology Conference, May 4-7, 1997, pp. 339-343, XP 0120228807, IEEE, New York, US.
Bryan D A et al: “Channel coding, modulation, and transmission for North American digital television” Philips Journal of Research, vol. 50, No. 1, 1996, pp. 131-157, XP004008207 Elsevier, Amsterdam, NL.
Karaoguz Jeyhan
Ungerboeck Gottfried
Broadcom Corporation
Burd Kevin
Garlick Bruce E.
Garlick & Harrison & Markison
LandOfFree
Optimal trellis code design for QPSK and higher order... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optimal trellis code design for QPSK and higher order..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optimal trellis code design for QPSK and higher order... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2748608