【発明の名称】無線周波数電力増幅器のクリッピング制御方法および無線周波数通信システム用送信機

Title:

【発明の名称】無線周波数電力増幅器のクリッピング制御方法および無線周波数通信システム用送信機

Document Type and Number:

Japanese Patent JPH05507834

Kind Code:

A

Abstract:

In a QAM microwave radio communications system an IF (intermediate frequency) input signal is amplified and predistorted, and the amplified IF signal is mixed with a local oscillator signal to produce an RF (radio frequency) signal which is amplified in a power amplifier for transmission, the predistortion compensating for non-linear gain of the power amplifier. Clipping in the power amplifier is controlled by down-converting part of the RF signal to produce an IF output signal, monitoring amplitude distortion of the RF signal by comparing the IF output signal with the IF input signal, and controlling the IF amplifier gain in dependence upon the monitored amplitude distortion.

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Inventors:

McNicol John Duncan
Herman Stefan George

Application Number:

JP51619891A

Publication Date:

November 04, 1993

Filing Date:

October 11, 1991

Export Citation:

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Assignee:

Northern Telecom Limited

International Classes:

H03G3/20; H03G11/04; H04B1/04; H03G3/30; (IPC1-7): H03G3/30; H03G11/04

Attorney, Agent or Firm:

Kazuto Izumi

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