Distortion compensation apparatus

Details Distortion compensation apparatus Distortion compensation apparatus

2005-06-24

2009-11-03

Pathak, Sudhanshu C (Department: 2611)

Pulse or digital communications

Transmitters

Antinoise or distortion

C375S297000, C375S298000, C375S346000, C455S126000

Reexamination Certificate

active

07613250

ABSTRACT:
Provided is a distortion compensation apparatus which can correspond to the number of carriers adaptively. The apparatus includes a distortion compensation processing circuit multiplying an input signal by a distortion compensation coefficient; a distortion compensation coefficient storage storing the distortion compensation coefficient correspondingly to the input signal power; a distortion compensation coefficient calculator calculating an update value of the distortion compensation coefficient stored in the distortion compensation coefficient storage, based on the input signal and a feedback signal being feedbacked from the output side of a distortion device; a digital filter inputting the output of the distortion compensation processing circuit. Further is included a modifying unit, which modifies the passband of the digital filter so as to reduce a distortion compensation control bandwidth in the predistortion portion, in response to the reduction of the number of carriers in the input signal.

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3GPP TS 25.104, 3rdGeneration Partnership Project; Technical Specification Group Radio Access Network; Base Station (BS) radio transmission and reception (FDD).
European Search Report dated Jun. 21, 2007, from the corresponding European Application.

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