Pulse or digital communications – Transmitters – Quadrature amplitude modulation
Patent
1996-12-30
2000-04-11
Pham, Chi H.
Pulse or digital communications
Transmitters
Quadrature amplitude modulation
375295, H04L 2736
Patent
active
060495723
ABSTRACT:
A digital modulator is disclosed for handling primary and auxiliary frames of binary information as part of a two channel communication system. The modulator includes a primary frame-to-vector mapper for generating primary symbol vectors in accordance with quadrature amplitude and phase shift keying (QAM), and an auxiliary frame-to-vector mapper for generating auxiliary vectors in the In-Phase and Quadrature (I-Q) signal space. For those auxiliary vectors having endpoints lying within a given first area, the endpoints are mapped into a second area that represents an optimum auxiliary signal content given a primary symbol constellation in the I-Q plane. A mapped auxiliary vector is then added to an associated primary symbol vector. A carrier is then modulated in accordance with the sum vector.
REFERENCES:
patent: 5105443 (1992-04-01), Betts et al.
patent: 5237292 (1993-08-01), Chethik
patent: 5440585 (1995-08-01), Partridge, III
patent: 5515400 (1996-05-01), Arai
patent: 5521942 (1996-05-01), Betts et al.
patent: 5524025 (1996-06-01), Lawrence et al.
patent: 5559791 (1996-09-01), Bremer et al.
patent: 5661718 (1997-08-01), Bremer et al.
Bayard Emmanuel
Intel Corporation
Pham Chi H.
LandOfFree
Optimization of QAM constellation space for auxiliary I-Q signal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optimization of QAM constellation space for auxiliary I-Q signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optimization of QAM constellation space for auxiliary I-Q signal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1182263