Reducing distortion of signals

Details Reducing distortion of signals Reducing distortion of signals

2006-09-12

2006-09-12

Ghebretinsae, Temesghen (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C330S278000, C330S291000, C330S295000, C330S302000, C702S086000

Reexamination Certificate

active

07106806

ABSTRACT:
A predistorter (26) comprises an array (44) of band pass filters (46to52) which divide an input signal into components. Each of the components is manipulated using coefficients retrieved from respective look-up tables (54to60). The amplitude of each component is used to retrieve a coefficient from its respective look-up table. The amplitude of each component is then multiplied with its respective retrieved coefficient to generate a predistorted amplitude for that component. The predistorted amplitudes are summed (at80) to produce a predistorted input signal. The predistortion of the input signal is arranged to counter the distortion characteristic of a signal handling element (such as non-linear power amplifier22in FIG.1) to which the predistorted input signal is subsequently supplied. The coefficients in the look-up tables (54to60) can be adapted using feed back from the output of the signal handling means (FIG.5). Fast Fourier transformation and inverse fast Fourier transformation can be used in place of band pass filter array (44) and combiner (80), respectively (FIG.4).

REFERENCES:
patent: 5164678 (1992-11-01), Puri
patent: 5347529 (1994-09-01), Noe
patent: 5732333 (1998-03-01), Cox et al.
patent: 5748678 (1998-05-01), Valentine et al.
patent: 5760646 (1998-06-01), Belcher et al.
patent: 5867065 (1999-02-01), Leyendecker
patent: 5892397 (1999-04-01), Belcher et al.
patent: 6104239 (2000-08-01), Jenkins
patent: 6216100 (2001-04-01), Meghdadi et al.
patent: 6591234 (2003-07-01), Chandran et al.
patent: 6614854 (2003-09-01), Chow et al.
patent: 6674324 (2004-01-01), Ocenasek et al.
patent: 6798843 (2004-09-01), Wright et al.
patent: 19 637 582 (1998-03-01), None
patent: 0 498 456 (1992-08-01), None
patent: 0 513 402 (1992-11-01), None
patent: 0 896 426 (1999-02-01), None
patent: WO 98/12800 (1998-03-01), None
patent: WO 99/22444 (1999-05-01), None
Newton, “Newton's Telecom Dictionary”. Ed 10th, 2004. p. 336.

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