Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2006-04-18
2006-04-18
Deppe, Betsy L. (Department: 2637)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S260000, C375S302000
Reexamination Certificate
active
07031397
ABSTRACT:
Communication systems employing subchannel communication such as OFDM or multicode CDMA have a disadvantage of power variation of the transmitted signal. The present invention provides reduced power variation without compromising performance or bandwidth. Information symbols to be transmitted on the individual subchannel are fed to encoders which map the information symbols into channel symbols by increasing their order. The encoding in response to a forward error correction scheme and includes selection between redundant symbol values to reduce power variation. Preferably the encoder includes a trellis coder jointly encoding the symbols and a compensation data set to reduce power variation.
REFERENCES:
patent: 5329552 (1994-07-01), de Couasnon et al.
patent: 5502744 (1996-03-01), Marshall
patent: 5642384 (1997-06-01), Ramesh
patent: 5835536 (1998-11-01), May et al.
patent: 5862182 (1999-01-01), Awater et al.
patent: 5894498 (1999-04-01), Kotzin et al.
patent: 5914933 (1999-06-01), Cimini et al.
patent: 5982818 (1999-11-01), Krueger et al.
patent: 6125103 (2000-09-01), Bauml et al.
patent: 6128351 (2000-10-01), Jones et al.
patent: 6130918 (2000-10-01), Humphrey et al.
patent: 6175551 (2001-01-01), Awater et al.
patent: 6556557 (2003-04-01), Cimini et al.
patent: 19625054 (1996-06-01), None
patent: 0822690 (1998-02-01), None
patent: WO96/13918 (1996-05-01), None
patent: WO97/26743 (1997-07-01), None
patent: WO98/11698 (1998-03-01), None
Wilkinson T.A. Et Al.: “Minimisation Of The Peak To Mean Envelope Power Ration Of Multicarrier Transmission Schemes By Block Codeing”, Proceedings Of The Vehicular Technology Conference, Chicago, Jul. 25-28, 1995, vol. 2, Jul. 25, 1995, Institute Of Electrical And Electronics Engineers, pp. 825-829, Xp000551649.
Fernando, W.A.C., Rajatheva, R.M.A.P., “Performance of COFDM for Leo Satellite Channels in Global Mobile Communications”, IEEE, 1998, XP002118737m pp. 1503-1507.
Morrison, I.S. ACE-QPSK: A New Method Of Coding QPSK For The Nonlinear Transmitter; Australian Space Centre for Signal Processing, University of South Australia; XP-002118738.
Ochiai, H. and Pmai, H.: “OFDM-CDMA with Peak Power Reduction Based on the Spreading Sequences”; Institute of Industrial Science, University of Toyko; IEEE 1998; pp. 1299-1303.
Deppe Betsy L.
Haas Kenneth A.
Mancinci Brian M.
May Steven A.
Motorola Inc.
LandOfFree
Communication system with reduced power variation and method... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Communication system with reduced power variation and method..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Communication system with reduced power variation and method... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3544556