JP2009200654A5 - - Google Patents
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- JP2009200654A5 JP2009200654A5 JP2008038122A JP2008038122A JP2009200654A5 JP 2009200654 A5 JP2009200654 A5 JP 2009200654A5 JP 2008038122 A JP2008038122 A JP 2008038122A JP 2008038122 A JP2008038122 A JP 2008038122A JP 2009200654 A5 JP2009200654 A5 JP 2009200654A5
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- amplitude
- distortion
- distortion compensation
- compensation
- input signal
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Claims (12)
前記第１および第２誤差演算部での演算結果がそれぞれ書込まれる第１および第２補償テーブルと、
入力信号の振幅が前回の入力時よりも上昇したか下降したかに応じて前記歪補償データを演算する誤差演算部を切替える第１切替器と、
入力信号の振幅が前回の入力時よりも上昇したか下降したかに応じて前記歪補償データを読出す補償テーブルおよび読出しアドレスを切替える第２切替器とを含むことを特徴とする歪補償回路。 First and second error calculation units for calculating distortion compensation data of the amplifier based on an input signal and a feedback signal of the amplifier;
First and second compensation tables in which calculation results in the first and second error calculation units are written, respectively;
A first switch that switches an error calculation unit that calculates the distortion compensation data according to whether the amplitude of the input signal has increased or decreased from the previous input;
A distortion compensation circuit, comprising: a compensation table for reading out the distortion compensation data and a second switch for switching a read address according to whether the amplitude of the input signal has increased or decreased from the previous input.
かつ入力信号の振幅が前回の入力時よりも上昇した場合に前記歪補償データが前記第１補償テーブルから読出され、下降した場合に前記第２補償テーブルから読出されることを特徴とする請求項１記載の歪補償回路。 When the amplitude of the input signal increases from the previous input, the distortion compensation data is calculated by the first error calculation unit, and when it decreases, the distortion calculation data is calculated by the second error calculation unit,
The distortion compensation data is read from the first compensation table when the amplitude of the input signal is higher than that at the previous input, and is read from the second compensation table when it is lowered. The distortion compensation circuit according to 1.
入力信号の振幅が前回の入力時よりも上昇したか下降したかを判定しその結果を前記第２切替器に通知する振幅比較部とを含むことを特徴とする請求項１または２記載の歪補償回路。 An amplitude determination unit that determines whether the amplitude of the input signal has increased or decreased compared to the previous input and notifies the first switch of the result;
3. The distortion according to claim 1, further comprising: an amplitude comparison unit that determines whether the amplitude of the input signal has increased or decreased compared to the previous input and notifies the second switch of the result. Compensation circuit.
前記誤差演算部による演算結果を前記誤差演算部に対応する第１または第２補償テーブルに書込む第２ステップと、
入力信号の振幅が前回の入力時よりも上昇したか下降したかに応じて前記歪補償データを読出す補償テーブルおよび読出しアドレスを前記第１または第２補償テーブルに切替える第３ステップとを含むことを特徴とする歪補償方法。 A first step of switching the error calculation unit for calculating distortion compensation data of the amplifier to the first or second error calculation unit according to whether the amplitude of the input signal has increased or decreased compared to the previous input;
A second step of writing a calculation result by the error calculation unit into a first or second compensation table corresponding to the error calculation unit;
A compensation table for reading out the distortion compensation data and a third step for switching the readout address to the first or second compensation table according to whether the amplitude of the input signal has increased or decreased from the previous input. A distortion compensation method characterized by the above.
かつ入力信号の振幅が前回の入力時よりも上昇した場合に前記歪補償データが前記第１補償テーブルから読出され、下降した場合に前記第２補償テーブルから読出されることを特徴とする請求項８記載の歪補償方法。 When the amplitude of the input signal increases from the previous input, the distortion compensation data is calculated by the first error calculation unit, and when it decreases, the distortion calculation data is calculated by the second error calculation unit,
The distortion compensation data is read from the first compensation table when the amplitude of the input signal is higher than that at the previous input, and is read from the second compensation table when it is lowered. 9. The distortion compensation method according to 8.
入力信号の振幅が前回の入力時よりも上昇したか下降したかを判定しその結果を前記第３ステップに通知する第５ステップとを含むことを特徴とする請求項７または９記載の歪補償方法。 A fourth step of determining whether the amplitude of the input signal has increased or decreased from the previous input, and notifying the result to the first step;
10. The distortion compensation according to claim 7, further comprising: a fifth step of determining whether the amplitude of the input signal has increased or decreased from the previous input and notifying the result to the third step. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008038122A JP5228521B2 (en) | 2008-02-20 | 2008-02-20 | Distortion compensation circuit, transmission apparatus, communication system, and distortion compensation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008038122A JP5228521B2 (en) | 2008-02-20 | 2008-02-20 | Distortion compensation circuit, transmission apparatus, communication system, and distortion compensation method |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2009200654A JP2009200654A (en) | 2009-09-03 |
| JP2009200654A5 true JP2009200654A5 (en) | 2011-02-17 |
| JP5228521B2 JP5228521B2 (en) | 2013-07-03 |
Family
ID=41143719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2008038122A Expired - Fee Related JP5228521B2 (en) | 2008-02-20 | 2008-02-20 | Distortion compensation circuit, transmission apparatus, communication system, and distortion compensation method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5228521B2 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003347944A (en) * | 2002-05-24 | 2003-12-05 | Fujitsu Ltd | Distortion compensation transmission apparatus |
| JP4282955B2 (en) * | 2002-07-02 | 2009-06-24 | 株式会社日立国際電気 | Distortion compensation device |
| WO2004055976A1 (en) * | 2002-12-17 | 2004-07-01 | Matsushita Electric Industrial Co., Ltd. | Distortion compensation table creation method and distortion compensation method |
| AU2003289101A1 (en) * | 2002-12-17 | 2004-11-19 | Matsushita Electric Industrial Co., Ltd. | Distortion compensation device and distortion compensation method |
| JP3819874B2 (en) * | 2003-05-29 | 2006-09-13 | 株式会社東芝 | Path search device, communication terminal device, and path search method |
-
2008
- 2008-02-20 JP JP2008038122A patent/JP5228521B2/en not_active Expired - Fee Related
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