Pulse or digital communications – Transmitters – Antinoise or distortion
Patent
1998-08-28
2000-08-15
Pham, Chi H.
Pulse or digital communications
Transmitters
Antinoise or distortion
375261, 375285, 375298, 332103, H04K 102, H04L 2503, H04L 2549
Patent
active
061047619
ABSTRACT:
A constrained-envelope digital-communications transmitter circuit (22) in which a binary data source (32) provides an input signal stream (34), a phase mapper (44) maps the input signal stream (34) into a quadrature phase-point signal stream (50) having a predetermined number of symbols per unit baud interval (64) and defining a phase point (54) in a phase-point constellation (46), a pulse-spreading filter (76) filters the phase-point signal stream (50) into a filtered signal stream (74), a constrained-envelope generator (106) generates a constrained-bandwidth error signal stream (108) from the filtered signal stream (74), a delay element (138) delays the filtered signal stream (74) into a delayed signal stream (140) synchronized with the constrained-bandwidth error signal stream (108), a complex summing circuit (110) sums the delayed signal stream (140) and the constrained-bandwidth error signal stream (108) into a constrained-envelope signal stream (112), and a substantially linear amplifier (146) amplifies the constrained-envelope signal stream (112) and transmits it as a radio-frequency broadcast signal (26).
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Badke Bradley P.
Cochran Bruce A.
McCallister Ronald D.
Corrielus Jean B.
Gresham, Esq. Lowell W.
Meschkow, Esq. Jordan M.
Pham Chi H.
SiCOM, Inc.
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