Pulse or digital communications – Receivers – Angle modulation
Reexamination Certificate
2003-10-08
2010-06-15
Payne, David C (Department: 2611)
Pulse or digital communications
Receivers
Angle modulation
C375S261000, C375S316000, C375S324000, C375S340000
Reexamination Certificate
active
07738599
ABSTRACT:
In a quadrature amplitude (QAM) demodulator, an auxiliary symbol may be utilized in place of the decision symbol to adjust the decision-feedback loops within the demodulator. For the formation and definition of the auxiliary symbol, the radius and angle information of the received signal or of the preliminary symbol may be used. Through use of the auxiliary symbol instead of the decision symbol, any error in the angle information due to the unknown frequency and phase deviation of the local oscillator may be ignored. An auxiliary symbol generator may be provided which, instead of assigning to the received signal an element from the predetermined symbol alphabet, generates an auxiliary symbol that lies on the most probable one of the nominal radii. Nominal radii may mean those radii on which in QAM the predetermined symbols of the alphabet lie in the plane determined by the quadrature signal pair. For the angle component of the auxiliary symbol, the angle information of the sampled digital signal may be used. In polar coordinates, the auxiliary symbol may thus correspond to the vector intersection point of the sampled digital signal with the most probable nominal radius.
REFERENCES:
patent: 4646173 (1987-02-01), Kammeyer et al.
patent: 4843616 (1989-06-01), Hoffmann
patent: 4958360 (1990-09-01), Sari
patent: 5471508 (1995-11-01), Koslov
patent: 5519356 (1996-05-01), Greenberg
patent: 5640417 (1997-06-01), Barabash et al.
patent: 5748674 (1998-05-01), Lim
patent: 7283599 (2007-10-01), Herbig
patent: 2001/0017897 (2001-08-01), Ahn
patent: 2003/0058967 (2003-03-01), Lin et al.
patent: 2005/0220220 (2005-10-01), Belotserkovsky
patent: 195 30 250 (1997-02-01), None
patent: 195 40 250 (1997-02-01), None
patent: 0 537 587 (1993-04-01), None
patent: 0 583 643 (1994-02-01), None
patent: 6500914 (1994-07-01), None
patent: WO97/16002 (1997-05-01), None
patent: WO 00/67441 (2000-11-01), None
K. D. Kammeyer, “Nachrichtenübertragung”, published by B. G. Teubner, Stuttgart, 2nd edition, 1996, pp. 196-215, 424-438.
Bock Christian
Noeske Carsten
Temerinac Miodrag
DLA Piper (LLP) US
Flores Leon
Payne David C
Trident Microsystems (Far East) Ltd.
LandOfFree
Method and circuit for generating an auxiliary symbol for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and circuit for generating an auxiliary symbol for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and circuit for generating an auxiliary symbol for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4184013