Pulse or digital communications – Transmitters
Reexamination Certificate
2006-02-14
2006-02-14
Vanderpuye, Kenneth (Department: 2631)
Pulse or digital communications
Transmitters
Reexamination Certificate
active
06999522
ABSTRACT:
A constrained-envelope digital communications transmitter (10) places constraints on the envelope of a spectrally constrained, digitally modulated communication signal (42) to lower peak-to-average power ratio without allowing significant spectral regrowth. A communication signal (14,42) is applied to a plurality of cascade-coupled constrained-envelope generators (50). Each constrained-envelope generator (50) detects overpeak events (52) and configures corrective impulses (54) for the overpeak events (52). The corrective impulses (54) are filtered into shaped pulses (88) that exhibit a constrained spectrum and combine with the communication signal (14, 42) to reduce an unwanted signal peak. Trailing portions (92) of the shaped pulses (88) are fed-back and combined with the communication signal (14,42) so that future overpeak events (52) are identified after compensation is made for the influence of the trailing portions (92) of any recently past shaped pulses (88) on the communication signal (14,42).
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Gresham Lowell W.
Intersil America's Inc.
Meschkow Jordan M.
Meschkow & Gresham P.L.C.
Nguyen Dung X.
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