歪み補償器

Distortion compensator

Abstract

PROBLEM TO BE SOLVED: To automatically perform stop control/stop cancel control over distortion compensating operation by monitoring input/output levels. SOLUTION: The output level of the output signal D1 of a distortion compensating circuit 122 is monitored and when a variation permissible range is exceeded, a control signal C2 stopping update of a compensation table is sent to the distortion compensating circuit 122 to stop the compensating operation, so that the output level of the distortion compensating circuit 122 is fixed at a limit value. Further, the input level of the monitor output signal B1 of a power amplifier 14 is monitored and when the permissible range is entered, a control signal C3 canceling the stop of the compensation table update is sent to the distortion compensating circuit 122 to restart the compensating operation. COPYRIGHT: (C)2007,JPO&INPIT
【課題】 入出力レベルを監視し、ひずみ補償動作の停止制御/停止解除制御を自動的に行なえるようにする。 【解決手段】 歪み補償回路122の出力信号D1の出力レベルを監視し、変動許容範囲を越える場合に補償テーブル更新を停止させる制御信号C2を歪み補償回路122に送って補償動作を停止させ、歪み補償回路122の出力レベルを制限値に固定させる。また、電力増幅器14のモニタ出力信号B1の入力レベルを監視して許容範囲に入る場合に、補償テーブル更新停止を解除する制御信号C3を歪み補償回路122に送って補償動作を再開させる。 【選択図】図1

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Cited By (2)

    Publication numberPublication dateAssigneeTitle
    US-8553522-B2October 08, 2013Nec CorporationOFDMA-based radio communication apparatus and learning signal generation method for compensation of non-linear distortion in the radio communication apparatus
    US-9225364-B1December 29, 2015Fujitsu LimitedDistortion compensation method, distortion compensation apparatus, and non-transitory computer readable storage medium