Multiplex communications – Generalized orthogonal or special mathematical techniques – Quadrature carriers
Reexamination Certificate
2007-09-25
2007-09-25
Sam, Phirin (Department: 2616)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Quadrature carriers
C375S261000
Reexamination Certificate
active
10130589
ABSTRACT:
A hierarchical QAM system allows the transmission of different sources by embedding the relative constellation points. A QAM transmitting system, includes a source of a level 1 and a level 2 data stream, each data stream carrying successive symbols. A hierarchical QAM transmitter, coupled to the level 1 and level 2 data stream source, generates a hierarchical QAM signal in which a level 1 symbol is represented by a data point in one of four quadrants in the I-Q plane, and a level 2 symbol is represented by the data point in one of four sub-quadrants surrounding a center point of the quadrant containing the level 1 data point. The level 2 data point is spaced away from the center point by a grouping factor set to more closely match the bit error rate performance of the level 1 and level 2 data streams.
REFERENCES:
patent: 5471508 (1995-11-01), Koslov
patent: 5710754 (1998-01-01), Kaku et al.
patent: 5815531 (1998-09-01), Dent
patent: 6160855 (2000-12-01), Nakamura et al.
patent: 6359934 (2002-03-01), Yoshida
patent: 6597750 (2003-07-01), Knutson et al.
patent: 2001/0004767 (2001-06-01), Gordon et al.
patent: 0594505 (1994-04-01), None
D. Kim et al “Performance of Multiresolution OFDM on Frequency-Selective Fading Channels” Global Telecommunications Conference (GLOBECOM) US, IEEE, Nov. 3, 1997 pp. 16-20.
M. Russell et al “Terrestrial Digital Video Broadcasting for Mobile Reception Using OFDM” Wireless Personal Communications, NL vol. 2, No. ½, 1995, pp. 45-66.
Krauss Thomas Peter
Ramaswamy Kumar
Settle Timothy Forrest
Kurdyla Ronald H.
Laks Joseph J.
Sam Phirin
Thomson Licensing
LandOfFree
Hierarchical QAM transmission system with varying grouping... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hierarchical QAM transmission system with varying grouping..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hierarchical QAM transmission system with varying grouping... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3761227