Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2004-01-27
2008-09-30
Bayard, Emmanuel (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S295000
Reexamination Certificate
active
07430248
ABSTRACT:
A digital communications transmitter (100) includes a digital linear-and-nonlinear predistortion section (200) to compensate for linear and nonlinear distortion introduced by transmitter-analog components (120). A direct-digital-downconversion section (300) generates a complex digital return-data stream (254) from the analog components (120) without introducing quadrature imbalance. A relatively low resolution exhibited by the return-data stream (254) is effectively increased through arithmetic processing. Linear distortion is first compensated using adaptive techniques with an equalizer (246) positioned in the forward-data stream (112). Nonlinear distortion is then compensated using adaptive techniques with a plurality of equalizers (226) that filter a plurality of orthogonal, higher-ordered-basis functions (214) generated from the forward-data stream (112). The filtered-basis functions are combined together and subtracted from the forward-data stream (112).
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Bayard Emmanuel
Crestcom, Inc.
Gresham Lowell W.
Jacobsen Charlene R.
Meschkow Jordan M.
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