Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2005-08-09
2005-08-09
Ghayour, Mohammed (Department: 2631)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
C375S295000
Reexamination Certificate
active
06928121
ABSTRACT:
A constrained-envelope digital communications transmitter (10) places constraints on the envelope of spectrally constrained, digitally modulated communication signals (46) converted into diverse frequency channels (54) and combined into a composite signal (58). The envelope constraints achieve lower peak-to-average power ratio without allowing significant spectral regrowth. The composite signal (58) is applied to a plurality of cascade-coupled constrained-envelope generators (64). Each constrained-envelope generator (64) detects overpeak events (66) and configures corrective impulses (68) for the overpeak events (66). The corrective impulses (68) are distributed to the respective frequency channels (54) in accordance with a predetermined distribution profile (102) and are filtered into allocated shaped pulses (120) that exhibit a constrained spectrum. The allocated shaped pulses (120) are coherently converted into the respective frequency channels (54) and combined with the composite signal (58) to reduce an unwanted signal peak.
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MacFarlane Shearer, III Daniel D.
Sills James A.
Ghayour Mohammed
Gresham Lowell W.
Intersil America's Inc.
Meschkow Jordan M.
Meschkow & Gresham P.L.C.
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