Title:
【発明の名称】電力増幅器の適応線形化
Document Type and Number:
Japanese Patent JP2003513498
Kind Code:
A
Abstract:
A method and apparatus adaptively compensates for nonlinearities of a power amplifier by measuring a distortion characteristic across the power amplifier during amplification of a distortion detection signal. The distortion detection signal has a well-defined input power versus time relationship, such as ramp-up signal or ramp-down signal. Due to this well-defined relationship, the distortion characteristic can be calculated as a function of the input power level. This calculated function is then utilized to update a predistortion lookup table.
Inventors:
Jonas, Parson
Application Number:
JP2001533620A
Publication Date:
April 08, 2003
Filing Date:
October 16, 2000
Export Citation:
Assignee:
Telefon Acty Bora Get Elm Ericsson (Pubble)
International Classes:
H03F1/32; H04B1/04; (IPC1-7): H03F1/32; H04B1/04
Domestic Patent References:
| JPH11243430A | 1999-09-07 | |||
| JPH11136302A | 1999-05-21 | |||
| JPH0969733A | 1997-03-11 | |||
| JPH11127206A | 1999-05-11 | |||
| JPH05218752A | 1993-08-27 | |||
| JP2000216640A | 2000-08-04 | |||
| JPS6278902A | 1987-04-11 | |||
| JPH0879143A | 1996-03-22 |
Foreign References:
| US4462001A | 1984-07-24 | |||
| US5892397A | 1999-04-06 | |||
| EP0513402A1 | 1992-11-19 |
Attorney, Agent or Firm:
Yasunori Otsuka (3 others)