Pulse or digital communications – Transmitters – Antinoise or distortion
Patent
1996-04-04
1997-12-09
Chin, Stephen
Pulse or digital communications
Transmitters
Antinoise or distortion
375298, 375308, H04L 100, H04L 2720, H04L 2736
Patent
active
056967942
ABSTRACT:
A digitally modulated signal is conditioned, such as to facilitate amplification (500). The digitally modulated signal is derived from a digital information stream which is mapped onto a symbol constellation to generate a sequence of channel symbols. From a signal envelope representing the sequence of channel symbols, signal envelope minimum values are determined for the signal envelope as it transitions through successive channel symbols of the sequence (510). A modified sequence of channel symbols is generated by adjusting at least some channel symbols of the sequence, preferably based on response characteristics of a spectral shaping filter, to avoid signal envelope minimum values below a threshold value, thereby conditioning the digitally modulated signal (515, 520, 530, 540, 545, 555).
REFERENCES:
patent: 4291277 (1981-09-01), Davis et al.
patent: 4410955 (1983-10-01), Burke et al.
patent: 4646326 (1987-02-01), Backof, Jr. et al.
patent: 5093637 (1992-03-01), Isota et al.
patent: 5204881 (1993-04-01), Cardini et al.
patent: 5600676 (1997-02-01), Ramesh
patent: 5621762 (1997-04-01), Miller et al.
patent: 5629961 (1997-05-01), Kawabata
Chin Stephen
Fuller Andrew S.
Gluck Jeffrey W.
Motorola Inc.
LandOfFree
Method and apparatus for conditioning digitally modulated 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 Method and apparatus for conditioning digitally modulated signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for conditioning digitally modulated signal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1613950