CN102394845A - Digital predistortion device with drain modulation function - Google Patents
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Abstract
The invention relates to a digital predistortion device with a drain modulation function, which is connected with a power amplifier and comprises a digital baseband signal processor, a signal transformation module and a radio frequency and frequency conversion module which are sequentially connected by a circuit, wherein the digital baseband signal processor contains a digital clipping module as well as a predistortion processing module and a drain modulation module which are respectively connected with the output end of the digital clipping module by the circuit. When carrying out digital clipping and predistortion process, the device also can carry out drain modulation on the power amplifier, and can simultaneously achieve the benefits of improving power amplifier linearity and power amplifier dynamic effect as well as reducing peak-to-average power ratio (PAPR) and signal distortion.
Description
Technical field
The present invention relates to a kind of digital predistortion apparatus, belong to the power amplifier linearization technical field with drain modulation function.
Background technology
OFDM (OFDM has been widely used in the new generation of wireless communication; Orthogonal Frequency Division Multiplexing) new modulation technique such as; When improving the availability of frequency spectrum, make that the peak-to-average force ratio of signal is bigger, this reaches the power amplifier linearity and dynamically has higher requirement.In wireless telecommunications, for satisfy big peak-to-average force ratio, big dynamically, the requirement of high linearity, have to power amplifier is carried out rollback, this has caused the rapid decline of power amplification efficiency.
And adopt digital pre-distortion technology can effectively compensate the nonlinear effect of power amplifier, and make the linearity of power amplifier be able to promote, efficient also has raising simultaneously.
In addition, adopt digital slicing to handle the peak-to-average force ratio that can reduce signal, make the power amplifier rollback reduce, efficient gets a promotion.But digital wave absorption processing can bring certain distorted signals, so the peak-to-average force ratio of signal can only obtain reduction to a certain extent.
It is thus clear that, have the power amplification system of predistortion function at present, can't effectively solve the contradiction of peak-to-average force ratio and power amplification efficiency, can not reach simultaneously and both improve the power amplifier linearity, improve the power amplifier dynamic effect again, and reduce peak-to-average force ratio and these 3 beneficial effects of distorted signals.
Summary of the invention
The purpose of this invention is to provide a kind of digital predistortion apparatus with drain modulation function; When carrying out digital slicing and pre-distortion; Also can carry out drain modulation to power amplifier; Can reach simultaneously and both improve the power amplifier linearity, improve the power amplifier dynamic effect again, and reduce the beneficial effect of peak-to-average force ratio and distorted signals.
For realizing above-mentioned purpose, the present invention provides a kind of digital predistortion apparatus with drain modulation function, is connected with power amplifier, comprises the digital baseband signal processor, signal conversion module and the radio frequency frequency-variable module that connect through circuit successively; Wherein, described digital baseband signal processor comprises digital slicing module, the pre-distortion module and the drain modulation module that are connected through circuit with the output of this numeral slicing module respectively.
Described digital slicing module is carried out digital wave absorption to the baseband signal of input.
Described pre-distortion module is carried out pre-distortion to the output feedback signal of the baseband signal of accomplishing digital wave absorption and the power amplifier that receives; And according to the pre-distortion parameters of the output feedback signal correction pre-distortion module of power amplifier.
The output of described drain modulation module is connected with power amplifier, to the drain modulation of carrying out of power amplifier.
Described signal conversion module comprises first D/A converter module and analog-to-digital conversion module; Described radio frequency frequency-variable module comprises up-conversion module and down conversion module.
Described first D/A converter module and up-conversion module are connected between the input of output and power amplifier of pre-distortion module through circuit successively; This first D/A converter module is to transfer to the up-conversion module after the analog signal to carry out digital-to-analogue conversion through the baseband signal of pre-distortion; This up-conversion module up-converts to received intermediate frequency analog baseband signal radiofrequency signal and transfers to power amplifier.
Said analog-to-digital conversion module and down conversion module are connected between the feedback input end of feedback output end and pre-distortion module of power amplifier through circuit successively; This down conversion module down-converts to intermediate-freuqncy signal with the feedback radiofrequency signal of power amplifier coupling output, and transfers to analog-to-digital conversion module; It is the feedback input end that transfers to the pre-distortion module after the digital signal that this analog-to-digital conversion module carries out analog-to-digital conversion to received feedback intermediate-freuqncy signal.
Described drain modulation module comprises envelope detection module, drain modulation control module and second D/A converter module that connects through circuit successively; Described envelope detection module is carried out quick amplitude extraction and detection to the baseband signal of accomplishing digital wave absorption, obtains envelope detection signal and peak-to-average force ratio thereof; Described drain modulation control module is carried out drain modulation to the envelope detection signal, obtains the drain modulation control signal; Described second D/A converter module is carried out digital-to-analogue conversion with the drain modulation control signal, and output simulation drain modulation controls signal to power amplifier and carries out drain modulation.
Described drain modulation control module is used one dimension look-up table method, in look-up table, obtains drain electrode control voltage data according to different envelope detection signal correspondences, is the drain modulation control signal with the envelope detection conversion of signals.
Described drain modulation module also comprises the Threshold detection module that is connected with the output of envelope detection module; Described Threshold detection module detects the peak-to-average force ratio of envelope detection signal; When detection obtains peak-to-average force ratio greater than predetermined threshold value; Send the drain modulation signal to carry out drain modulation to the drain modulation control module; And, temporarily stop the pre-distortion module feedback signal of power amplifier is carried out pre-distortion to pre-distortion module transmission block signal.
Digital predistortion apparatus with drain modulation function of the present invention; Have following beneficial effect: the present invention adopts Digital Signal Processing; In being applied to the power amplifier linearization process; Input signal is carried out digital slicing and pre-distortion, reduce peak-to-average force ratio and effectively improve the power amplifier linearity; Obtain signal peak-to-average ratio through envelope detection simultaneously, and greatly dynamically the time, power amplifier is carried out drain modulation, control power amplifier drain electrode level is dynamically adjusted the power amplifier working point, and the transient behavior of power amplifier is got a promotion, and effectively improves power amplification efficiency.Thereby both guaranteed dynamic range, and can effectively improve power amplification efficiency again; In addition, in the drain modulation process, through the envelope detection signal is modulated power amplifier according to certain weighting modulation system, reduction factor word slicing is handled the signal waveform distortion that is brought.
Description of drawings
Fig. 1 is the theory diagram of the digital predistortion apparatus with drain modulation function among the present invention;
Fig. 2 is the theory diagram of the drain modulation module among the present invention.
Embodiment
Below in conjunction with Fig. 1～Fig. 2, specify a preferred embodiment of the present invention.
As shown in Figure 1; Digital predistortion apparatus with drain modulation function provided by the present invention; It is connected through circuit with power amplifier 4, specifically comprises the digital baseband signal processor 1, signal conversion module 2 and the radio frequency frequency-variable module 3 that connect through circuit successively.In the present embodiment, it is the power tube of Freescale MRF7S21210 that described power amplifier 4 adopts model.
Wherein, Described digital baseband signal processor 1 is by FPGA (field programmable gate array; Field Programmable Gata Array) constitutes; Comprise the digital slicing module 11 that is integrated among this FPGA, the pre-distortion module 12 and the drain modulation module 13 that are connected through circuit with the output of this numeral slicing module 11 respectively.In the present embodiment, described FPGA adopts the model of Altera Startix series to constitute digital baseband signal processor 1.
The baseband signal of 11 pairs of inputs of described digital slicing module is carried out digital wave absorption, reduces the peak-to-average force ratio of this baseband signal.12 pairs of baseband signals of accomplishing digital wave absorption of described pre-distortion module are further carried out pre-distortion; This pre-distortion module 12 is the nonlinear block with the contrary characteristic of power amplifier; Be used for nonlinear distortion, effectively improve the linearity of power amplifier 4 compensation and counteracting power amplifier 4.
Described signal conversion module 2 comprises first digital-to-analogue (DA) modular converter 21 (model as adopting Ti DAC5682 realizes) and modulus (AD) modular converter 22 (model as adopting Ti ADS61B49 realizes).Described radio frequency frequency-variable module 3 comprises up-conversion module 31 (model as adopting Ti TRF3703-33 realizes) and down conversion module 32 (model as adopting Hittite HMC483MS8 realizes).
A described DA modular converter 21 and up-conversion module 31 are connected between the input of output and power amplifier 4 of pre-distortion module 12 through circuit successively.It is to transfer to up-conversion module 31 after the analog signal that 21 pairs of baseband signals through pre-distortion of the one DA modular converter are carried out digital-to-analogue conversion, and this up-conversion module 31 up-converts to received intermediate frequency analog baseband signal radiofrequency signal and transfers to power amplifier 4.
Said AD modular converter 22 and down conversion module 32 are connected between the feedback input end of feedback output end and pre-distortion module 12 of power amplifier 4 through circuit successively.This down conversion module 32 down-converts to intermediate-freuqncy signal with the feedback radiofrequency signal of power amplifier 4 coupling outputs; And transferring to AD modular converter 22, it is the feedback input end that transfers to pre-distortion module 12 after the digital signal that 22 pairs of received feedback intermediate-freuqncy signals of this AD modular converter are carried out analog-to-digital conversion.The output feedback signal of 12 pairs of power amplifiers that receive 4 of described pre-distortion module carries out pre-distortion again, and passes through the dynamic change of the running parameter tracking power amplifier 4 of correction pre-distortion module 12 according to the output feedback signal of power amplifier 4.
As shown in Figure 2, the output of described drain modulation module 13 is connected with power amplifier 4, and it comprises envelope detection module 131, drain modulation control module 133 and second digital-to-analogue (DA) modular converter 134 that connects through circuit successively; This drain modulation module 13 also comprises the Threshold detection module 132 that is connected with the output of envelope detection module 131.
Wherein, 131 pairs of described envelope detection modules are accomplished the baseband signal of digital wave absorption and are carried out quick amplitude extraction and detection, obtain envelope detection signal and peak-to-average force ratio thereof.The peak-to-average force ratio of 132 pairs of envelope detection signals of described Threshold detection module detects; When detection obtains peak-to-average force ratio greater than predetermined threshold value; Explain that this moment, power amplifier 4 was in greatly dynamically, then send the drain modulation signal to proceed drain modulation to drain modulation control module 133.In the present embodiment, described predetermined threshold value is generally got about 6dB.133 pairs of envelope detection signals of described drain modulation control module carry out drain modulation according to certain weighting modulation system, obtain the drain modulation control signal.Described the 2nd DA modular converter 134 carries out digital-to-analogue conversion with the drain modulation control signal; And final output simulation drain modulation controls signal to power amplifier 4; Power amplifier 4 is carried out drain modulation; The transient behavior of power amplifier 4 is got a promotion, effectively improve the efficient of power amplifier 4.
Described drain modulation control signal is to be converted to through certain rule by the envelope detection signal, and for the different qualities of different power amplifiers, concrete modulation system also there are differences.In the present embodiment, use one dimension look-up table method, the drain electrode control store voltages that different envelope detection signals are corresponding is in look-up table, thereby realization obtains the drain modulation control signal with the envelope detection conversion of signals.And can control the data of voltage through the correspondence drain electrode of revising this look-up table storage, thus realize drain modulation function to the different qualities power amplifier, have higher flexibility.And the above-mentioned predetermined threshold value of mentioning to peak-to-average force ratio also can be upgraded setting through revising look-up table.
In addition; Owing to will inevitably cause the variation of power amplifier parameter when power amplifier 4 is carried out drain modulation; If carry out pre-distortion this moment simultaneously, the pre-distortion effect that then is used to compensate and offset the nonlinear distortion of power amplifier 4 will be had a greatly reduced quality, even run counter to desire.Therefore; The interference and the influence that pre-distortion are brought for fear of drain modulation; When Threshold detection module 132 detect obtain the envelope detection signal peak-to-average force ratio greater than predetermined threshold value; In the time of need carrying out drain modulation to power amplifier 4, this Threshold detection module 132 is sent block signal to pre-distortion module 12 simultaneously, and temporarily stop the feedback signal of 12 pairs of power amplifiers 4 of pre-distortion module and carry out pre-distortion this moment.
In sum, in fact the digital predistortion apparatus with drain modulation function of the present invention is divided into wave absorption, predistortion and drain modulation three parts, and wherein the slicing processing works alone, and predistortion and drain modulation are handled necessary collaborative work.For fear of mutual interference between drain modulation and the predistortion; The present invention has adopted two kinds of measures: the first, take the predistortion closedown mode, promptly when needs carry out drain modulation; The pre-distortion module is carried out locking, stop the power amplifier feedback signal is carried out pre-distortion; The second, take the Threshold detection mode, promptly the peak-to-average force ratio to the envelope detection signal carries out Threshold detection, has only when peak-to-average force ratio during greater than predetermined threshold value, just allows further power amplifier to be carried out drain modulation, with the negative effect of avoiding frequent modulation to be brought.
Digital predistortion apparatus with drain modulation function of the present invention; Have following beneficial effect: the present invention adopts Digital Signal Processing; In being applied to the power amplifier linearization process; Input signal is carried out digital slicing and pre-distortion, reduce peak-to-average force ratio and effectively improve the power amplifier linearity; Obtain signal peak-to-average ratio through envelope detection simultaneously, and greatly dynamically the time, power amplifier is carried out drain modulation, control power amplifier drain electrode level is dynamically adjusted the power amplifier working point, and the transient behavior of power amplifier is got a promotion, and effectively improves power amplification efficiency.Thereby both guaranteed dynamic range, and can effectively improve power amplification efficiency again; In addition, in the drain modulation process, through the envelope detection signal is modulated power amplifier according to certain weighting modulation system, reduction factor word slicing is handled the signal waveform distortion that is brought.
Therefore, the present invention can make the power amplification system with predistortion function reach simultaneously both to have improved the power amplifier linearity, and improved the power amplifier dynamic effect again, and reduce peak-to-average force ratio and these 3 beneficial effects of distorted signals.
Although content of the present invention has been done detailed introduction through above-mentioned preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited appended claim.
Claims (8)
1. the digital predistortion apparatus with drain modulation function is connected with power amplifier (4), it is characterized in that, comprises the digital baseband signal processor (1), signal conversion module (2) and the radio frequency frequency-variable module (3) that connect through circuit successively;
Described digital baseband signal processor (1) comprises digital slicing module (11), the pre-distortion module (12) and the drain modulation module (13) that are connected through circuit with the output of this numeral slicing module (11) respectively;
Described digital slicing module (11) is carried out digital wave absorption to the baseband signal of input;
Described pre-distortion module (12) is carried out pre-distortion to the output feedback signal of the baseband signal of accomplishing digital wave absorption and the power amplifier (4) that receives; And according to the pre-distortion parameters of the output feedback signal correction pre-distortion module (12) of power amplifier (4);
The output of described drain modulation module (13) is connected with power amplifier (4), to the drain modulation of carrying out of power amplifier (4).
2. the digital predistortion apparatus with drain modulation function as claimed in claim 1 is characterized in that, described signal conversion module (2) comprises first D/A converter module (21) and analog-to-digital conversion module (22).
3. the digital predistortion apparatus with drain modulation function as claimed in claim 2 is characterized in that, described radio frequency frequency-variable module (3) comprises up-conversion module (31) and down conversion module (32).
4. the digital predistortion apparatus with drain modulation function as claimed in claim 3; It is characterized in that described first D/A converter module (21) and up-conversion module (31) are connected between the input of output and power amplifier (4) of pre-distortion module (12) through circuit successively;
Described first D/A converter module (21) is to transfer to up-conversion module (31) after the analog signal to carry out digital-to-analogue conversion through the baseband signal of pre-distortion;
Described up-conversion module (31) up-converts to received intermediate frequency analog baseband signal radiofrequency signal and transfers to power amplifier (4).
5. the digital predistortion apparatus with drain modulation function as claimed in claim 3; It is characterized in that said analog-to-digital conversion module (22) and down conversion module (32) are connected between the feedback input end of feedback output end and pre-distortion module (12) of power amplifier (4) through circuit successively;
Described down conversion module (32) down-converts to intermediate-freuqncy signal with the feedback radiofrequency signal of power amplifier (4) coupling output, and transfers to analog-to-digital conversion module (22);
It is the feedback input end that transfers to pre-distortion module (12) after the digital signal that described analog-to-digital conversion module (22) carries out analog-to-digital conversion to received feedback intermediate-freuqncy signal.
6. the digital predistortion apparatus with drain modulation function as claimed in claim 1; It is characterized in that described drain modulation module (13) comprises envelope detection module (131), drain modulation control module (133) and second D/A converter module (134) that connects through circuit successively;
Described envelope detection module (131) is carried out quick amplitude extraction and detection to the baseband signal of accomplishing digital wave absorption, obtains envelope detection signal and peak-to-average force ratio thereof;
Described drain modulation control module (133) is carried out drain modulation to the envelope detection signal, obtains the drain modulation control signal;
Described second D/A converter module (134) is carried out digital-to-analogue conversion with the drain modulation control signal, and output simulation drain modulation controls signal to power amplifier (4) and carries out drain modulation.
7. the digital predistortion apparatus with drain modulation function as claimed in claim 6; It is characterized in that; Described drain modulation control module (133) is used one dimension look-up table method; In look-up table, obtaining drain electrode control voltage data according to different envelope detection signal correspondences, is the drain modulation control signal with the envelope detection conversion of signals.
8. the digital predistortion apparatus with drain modulation function as claimed in claim 6 is characterized in that, described drain modulation module (13) also comprises the Threshold detection module (132) that is connected with the output of envelope detection module (131);
The peak-to-average force ratio of described Threshold detection module (132) detected envelope rectified signal; When detection obtains peak-to-average force ratio greater than predetermined threshold value; Send the drain modulation signal to carry out drain modulation to drain modulation control module (133); And, temporarily stop pre-distortion module (12) feedback signal of power amplifier (4) is carried out pre-distortion to pre-distortion module (12) transmission block signal.
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| CN2011103410926A CN102394845A (en) | 2011-11-02 | 2011-11-02 | Digital predistortion device with drain modulation function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108631794A (en) * | 2018-04-09 | 2018-10-09 | 京信通信系统（中国）有限公司 | The control method and system of digital pre-distortion block output signal |
| CN111656682A (en) * | 2018-02-12 | 2020-09-11 | 华为技术有限公司 | Method and apparatus for power regulation |
| CN116366408A (en) * | 2022-12-30 | 2023-06-30 | 珠海笛思科技有限公司 | Signal processing method and device, electronic equipment and readable storage medium |
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| WO2000011816A1 (en) * | 1998-08-25 | 2000-03-02 | Ortel Corporation | In-line predistorter for linearization of electronic and optical signals |
| CN101247153A (en) * | 2008-03-13 | 2008-08-20 | 中兴通讯股份有限公司 | Method for improving power amplifier efficiency and digital predistortion broadband communicator |
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- 2011-11-02 CN CN2011103410926A patent/CN102394845A/en active Pending
Patent Citations (2)
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| WO2000011816A1 (en) * | 1998-08-25 | 2000-03-02 | Ortel Corporation | In-line predistorter for linearization of electronic and optical signals |
| CN101247153A (en) * | 2008-03-13 | 2008-08-20 | 中兴通讯股份有限公司 | Method for improving power amplifier efficiency and digital predistortion broadband communicator |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111656682A (en) * | 2018-02-12 | 2020-09-11 | 华为技术有限公司 | Method and apparatus for power regulation |
| US11075659B2 (en) | 2018-02-12 | 2021-07-27 | Huawei Technologies Co., Ltd. | Power adjustment method and apparatus |
| CN111656682B (en) * | 2018-02-12 | 2022-01-14 | 华为技术有限公司 | Method, apparatus, and medium for power adjustment |
| CN108631794A (en) * | 2018-04-09 | 2018-10-09 | 京信通信系统（中国）有限公司 | The control method and system of digital pre-distortion block output signal |
| CN108631794B (en) * | 2018-04-09 | 2020-03-13 | 京信通信系统（中国）有限公司 | Control method and system for output signal of digital predistortion module |
| CN116366408A (en) * | 2022-12-30 | 2023-06-30 | 珠海笛思科技有限公司 | Signal processing method and device, electronic equipment and readable storage medium |
| CN116366408B (en) * | 2022-12-30 | 2024-01-05 | 珠海笛思科技有限公司 | Signal processing method and device, electronic equipment and readable storage medium |
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Application publication date: 20120328 |