CN203800956U - Digital pre-distortion system of off-line estimation pre-distortion coefficient - Google Patents
Digital pre-distortion system of off-line estimation pre-distortion coefficient Download PDFInfo
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- CN203800956U CN203800956U CN201420192199.8U CN201420192199U CN203800956U CN 203800956 U CN203800956 U CN 203800956U CN 201420192199 U CN201420192199 U CN 201420192199U CN 203800956 U CN203800956 U CN 203800956U
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Abstract
The utility model relates to a digital pre-distortion system of an off-line estimation pre-distortion coefficient. According to the system, an open-loop digital pre-distortion structure is used within a transmitter; a special calibration device receives a power amplifier signal through an antenna; the digital pre-distortion transmitter receives the pre-distortion coefficient which is acquired by estimation through a wireless interface and updates the pre-distortion coefficient. According to the utility model, the complexity, the volume, the weight and the cost of the digital pre-distortion transmitter can be reduced; the system can adapt to the change of the nonlinear characteristic of a power amplifier and carries out pre-distortion coefficient updating; the calibration device can work far away from the pre-distortion transmitter; a calibration device can correct the pre-distortion coefficients for a number of digital pre-distortion transmitters in the system; and the digital pre-distortion system is especially suitable for a satellite communication system.
Description
Technical field
The present invention relates to the processing method of power amplifier linearization, relate in particular to the digital pre-distortion system of satellite communication intermediate power amplifier.
Background technology
Along with improving constantly of message transmission rate, it is more and more crowded that wireless communication frequency band becomes, and band resource is more and more nervous.In order to improve spectrum efficiency, people have applied many new wideband digital transmission technologys, and these efficient Digital Modulation transmission technologys are nearly all based on non-constant envelope, and this just requires power amplifier to have the good linearity.But, consider the efficiency of power amplifier, amplifier is generally operational in saturation region, has very strong nonlinear distortion.The availability of frequency spectrum and power utilization are a pair of contradiction that needs solution, and carrying out linearization process for radio-frequency power amplifier is the key that solves this contradiction.
Pre-distortion technology is one of effective method of compensation power amplifier nonlinear distortion, and before predistorter is positioned over amplifier, its characteristic is the contrary characteristic of amplifier nonlinearity characteristic, thereby the combining characteristic of predistorter and amplifier is linearity.Pre-distortion technology becomes the Major Technology of power amplifier linearization at present.Digital pre-distortion is along with the development of Digital Signal Processing has obtained developing rapidly.Cause the drift of power amplifier nonlinear characteristic in order to compensate the surrounding environment change such as Yin Wendu, time, digital pre-distortion generally adopts closed-loop structure, significantly promote digital predistorter to temperature and aging adaptive capacity, promote the performance of power amplifier and the stability of system.Digital pre-distortion technology is the hot technology of current power amplifier linearization.
The general structure of adaptive digital pre-distortion transmitter as shown in Figure 1, first pre-distortion of digital baseband input signal, gives D/A and is converted to analog signal, and after filtering, direct orthogonalization is modulated to intermediate-frequency band, through the processing such as up-conversion, filter and amplification, after finally being amplified by power amplifier, export again.In figure, in the dotted line frame of below, be the feedback path of the required power amplifier output signal of adaptive digital pre-distortion, a part of power amplifier output signal is coupled, after down-conversion, quadrature demodulation is to base band, enter coefficient estimation module through filtering, A/D conversion again, coefficient estimation module is according to original base-band input signal and the power amplifier output signal of feedback, carry out pre-distortion coefficients estimation, revise the coefficient of predistortion module.
The structure of open loop digital pre-distortion does not have feedback path and pre-distortion coefficients to estimate, system is simple, is easy to realize.But due to pre-distortion coefficients be solidificated in transmitter inside, can not self adaptation adjustment, longevity of service, due to the factor such as aging, the nonlinear characteristic of power amplifier can change, the performance of open loop digital pre-distortion method also can decline.
Summary of the invention
The object of the invention is to reduce transmitter system complexity and cost, provide a kind of off-line to estimate the digital pre-distortion system of pre-distortion coefficients, to reach the same with closed-loop adaptation digital pre-distortion, and digital pre-distortion transmitter does not need complicated RF feedback loops, system stability, simple in structure, greatly reduce the complexity on transmitter software and hardware, improve transmitter frequency.
The present invention for the technical scheme that realizes goal of the invention and adopt is:
As shown in Figure 2, this digital pre-distortion system comprises: spaceborne open loop digital pre-distortion transmitter and ground calibrator (-ter) unit, spaceborne open loop digital pre-distortion transmitter and ground calibrator (-ter) unit wireless connections.
Described spaceborne open loop digital pre-distortion transmitter architecture, comprise: coefficient receives storage, predistortion module, D/A modular converter, filtering, direct modulation module, amplification and power amplifier module, coefficient receives storage and connects predistortion module, predistortion module connects D/A modular converter, D/A modular converter connects filtering, filtering connects direct modulation module, and directly modulation module is connected to and amplifies and power amplifier module.
Described ground calibrator (-ter) unit comprises: down-conversion assembly, oscilloscope and computer, and down-conversion assembly is connected to oscilloscope, and oscilloscope is connected to computer, and computer is connected to ground station.
The invention has the beneficial effects as follows: by the signal of wireless receiving satellite power amplifier output, then send new pre-distortion coefficients to satellite transmitter by ground station, open loop predistortion module is used new pre-distortion coefficients work, thereby obtains good predistortion effect.Can reduce complexity, volume, weight and the cost of spaceborne pre-distortion transmitter, can adapt to the variation of power amplifier nonlinear characteristic again and carry out pre-distortion coefficients renewal.
Brief description of the drawings
Fig. 1 is the general structure block diagram of adaptive digital pre-distortion transmitter;
Fig. 2 is the digital pre-distortion structural representation that off-line of the present invention is estimated pre-distortion coefficients.
Embodiment
Below in conjunction with accompanying drawing 2, the present invention is described in detail.
Digital pre-distortion system comprises: spaceborne open loop digital pre-distortion transmitter and ground calibrator (-ter) unit, spaceborne open loop digital pre-distortion transmitter and ground calibrator (-ter) unit wireless connections.
Described spaceborne open loop digital pre-distortion transmitter architecture, comprise: coefficient receives storage, predistortion module, D/A, filtering, direct modulation module, amplification and power amplifier module, coefficient receives storage and connects predistortion module, predistortion module connects D/A, D/A connects filtering, filtering connects direct modulation module, and directly modulation module is connected to and amplifies and power amplifier module.
Described ground calibrator (-ter) unit comprises: down-conversion assembly, oscilloscope and computer, and down-conversion assembly is connected to oscilloscope, and oscilloscope is connected to computer, and computer is connected to ground station.
By the signal of wireless receiving satellite power amplifier output, then send new pre-distortion coefficients to satellite transmitter by ground station, open loop predistortion module is used new pre-distortion coefficients work, thereby obtains good predistortion effect.
Claims (1)
1. off-line is estimated the digital pre-distortion system of pre-distortion coefficients, comprise: spaceborne open loop digital pre-distortion transmitter and ground calibrator (-ter) unit, it is characterized in that, spaceborne open loop digital pre-distortion transmitter and ground calibrator (-ter) unit wireless connections, described spaceborne open loop digital pre-distortion transmitter architecture, comprise: coefficient receives storage, predistortion module, D/A, filtering, directly modulation module, amplify and power amplifier module, coefficient receives storage and connects predistortion module, predistortion module connects D/A, D/A connects filtering, filtering connects direct modulation module, directly modulation module is connected to and amplifies and power amplifier module,
Described ground calibrator (-ter) unit comprises: down-conversion assembly, oscilloscope and computer, and down-conversion assembly is connected to oscilloscope, and oscilloscope is connected to computer, and computer is connected to ground station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420192199.8U CN203800956U (en) | 2014-04-21 | 2014-04-21 | Digital pre-distortion system of off-line estimation pre-distortion coefficient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420192199.8U CN203800956U (en) | 2014-04-21 | 2014-04-21 | Digital pre-distortion system of off-line estimation pre-distortion coefficient |
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| Publication Number | Publication Date |
|---|---|
| CN203800956U true CN203800956U (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420192199.8U Expired - Fee Related CN203800956U (en) | 2014-04-21 | 2014-04-21 | Digital pre-distortion system of off-line estimation pre-distortion coefficient |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105764075A (en) * | 2014-12-15 | 2016-07-13 | 联想(北京)有限公司 | Method for obtaining digital pre-distortion calibration value and terminal equipment |
| WO2017113785A1 (en) * | 2015-12-28 | 2017-07-06 | 中兴通讯股份有限公司 | Predistortion model adjusting method and device |
-
2014
- 2014-04-21 CN CN201420192199.8U patent/CN203800956U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105764075A (en) * | 2014-12-15 | 2016-07-13 | 联想(北京)有限公司 | Method for obtaining digital pre-distortion calibration value and terminal equipment |
| CN105764075B (en) * | 2014-12-15 | 2019-04-26 | 联想(北京)有限公司 | Obtain the method and terminal device of digital pre-distortion calibration value |
| WO2017113785A1 (en) * | 2015-12-28 | 2017-07-06 | 中兴通讯股份有限公司 | Predistortion model adjusting method and device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 Termination date: 20170421 |