Transmit pre-equalization in a modem environment

Details Transmit pre-equalization in a modem environment Transmit pre-equalization in a modem environment

2005-04-12

2005-04-12

Chin, Stephen (Department: 2634)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S298000

Reexamination Certificate

active

06879641

ABSTRACT:
The signal distortion present in a transmitted signal is measured and used to generate filter coefficients. The coefficients are stored in memory. A modulator generates an intermediate frequency signal. The modulator inputs the signal to a programmable predistortion filter. The characteristics of the filter are altered by the filter coefficients that have been programmed into the filter. The resulting filtered signal is upconverted to a frequency in a transmit frequency band.

REFERENCES:
patent: 5113414 (1992-05-01), Karam et al.
patent: 5268848 (1993-12-01), Coker et al.
patent: 6141390 (2000-10-01), Cova
patent: 6342810 (2002-01-01), Wright et al.
patent: 6373902 (2002-04-01), Park et al.
patent: 20030018982 (2003-01-01), Zeidler et al.

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