Invention Grant
US09025686B2 Method, radio unit and radio base station for adjusting thresholds for crest factor reduction
有权
方法，无线电单元和无线电基站，用于调整波峰因数降低的阈值
- Patent Title: Method, radio unit and radio base station for adjusting thresholds for crest factor reduction
- Patent Title (中): 方法，无线电单元和无线电基站，用于调整波峰因数降低的阈值
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Application No.: US13982413Application Date: 2011-02-17
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Publication No.: US09025686B2Publication Date: 2015-05-05
- Inventor: Tao Gu
- Applicant: Tao Gu
- Applicant Address: SE Stockholm
- Assignee: Telefonaktiebolaget L M Ericsson (Publ)
- Current Assignee: Telefonaktiebolaget L M Ericsson (Publ)
- Current Assignee Address: SE Stockholm
- Agency: Coats & Bennett, PLLC
- International Application: PCT/CN2011/000245 WO 20110217
- International Announcement: WO2012/109768 WO 20120823
- Main IPC: H04L5/12
- IPC: H04L5/12 ; H04L27/08 ; H04L27/26 ; H04L27/36
Abstract:
The present invention relates to clipping thresholds adjustment for Crest Factor Reduction CFR in a radio unit, wherein the radio unit comprises one or more clipping stages that apply respective clipping thresholds to clip input signals, comprising: determining a target threshold for the clipping stages based on a target PAR and the amplitudes or powers of the input signals, estimating the direction in which original PAR of the input signals changes by comparing amplitudes of the clipped signals from the clipping stages with the target threshold, and adjusting the clipping thresholds based on the estimated direction. The present invention also relates to dynamic stage control. With the present invention, clipping thresholds and clipping stages are adaptively changes with dynamic original PAR of input signals and the efficiency of power amplifier is increased with a low implementation cost.
Public/Granted literature
- US20130329819A1 Method, Radio Unit and Radio Base Station for Adjusting Thresholds for Crest Factor Reduction Public/Granted day:2013-12-12
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