CN203775240U - DPD MCPA (Digital Pre-Distortion Multi-Carrier Power Amplifier) feedback device and MCPA equipment - Google Patents
DPD MCPA (Digital Pre-Distortion Multi-Carrier Power Amplifier) feedback device and MCPA equipment Download PDFInfo
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Abstract
The utility model relates to a DPD MCPA (Digital Pre-Distortion Multi-Carrier Power Amplifier) feedback device and MCPA equipment. A radio frequency bandpass filter carries out filter processing on received feedback radio frequency signals and the processed signals are outputted to a feedback down converter; feedback intermediate frequency signals outputted by the feedback down converter are filtered via an intermediate frequency bandpass filter and then transmitted to a feedback analog to digital converter; and the feedback analog to digital converter carries out analog to digital conversion on the received signals, feedback digital signals are obtained and outputted to a DPD processor of the DPD MCPA, and the signals serve as reference data of DPD processing. When the radio frequency signal bandwidth is increased, intermodulation clutters in the feedback radio frequency signals can be removed via the radio frequency bandpass filter, overcorrection due to interference caused by the intermodulation clutters to the DPD processing can be avoided, and reducing of linear indexes can be effectively prevented. In addition, feedback intermediate frequency signals sent by the feedback down converter can be filtered again by the intermediate frequency bandpass filter, non-carrier interference signals in the feedback intermediate frequency signals can be removed, clutter interference can be further suppressed, and correction accuracy is improved.
Description
Technical field
The utility model relates to communication technical field, particularly relates to feedback device and the MCPA equipment of a kind of DPD MCPA.
Background technology
Along with people are explosive increase to demand data, need to carry out dilatation to base station.More conventional way is by adopting the form that base station+new subcarrier plate+base is put, and reaches the object of dilatation, reduces equipment investment.
Base is put also referred to as base station, its core devices is broadband MCPA(Multi-Carrier Power Amplifier, Multi-Carrier Power Amplifier), for amplifying the broad band multicarrier signal of base station output, belong to a kind of high-end devices that linear index and efficiency are had relatively high expectations.For broadband MCPA, main feed-forward technique and employing DPD(Digital Pre-Distortion, the digital pre-distortion of adopting at present) technology.Traditional DPD MCPA, first carries out down-conversion to radio-frequency input signals and modulus sampling processing obtains digital baseband signal, then utilizes DPD processor to carry out digital pre-distortion processing to digital baseband signal, produces digital predistortion signal.The radiofrequency signal of digital predistortion signal being carried out digital-to-analogue conversion and upconversion process and obtained predistortion, power amplifier carries out power amplification to the radiofrequency signal of predistortion and obtains radio frequency output signal.
In the time that radiofrequency signal bandwidth increases, traditional DPD MCPA can produce intermodulation clutter after power amplifier, in being coupled the radiofrequency signal obtaining, feedback circuit also can comprise intermodulation clutter, be delivered to DPD processor through feedback down-conversion together with main signal after modulus sampling, because the overcorrect of DPD processor causes linear index low.
Utility model content
Based on this, embodiment of the present utility model, for the problems referred to above, provides feedback device and the MCPA equipment of a kind of DPD MCPA that can prevent linear index reduction in the time that radiofrequency signal bandwidth increases.
The feedback device of a kind of DPD MCPA, comprise the radio frequency band filter connecting successively, feedback down-conversion device, if bandpas filter and feedback modulus transducer, described radio frequency band filter receives the feedback radiofrequency signal of DPD MCPA to carry out exporting described feedback down-conversion device to after filtering, described feedback down-conversion device output feedback intermediate-freuqncy signal is to described if bandpas filter, described if bandpas filter carries out exporting described feedback modulus transducer to after filtering to described feedback intermediate-freuqncy signal, described feedback modulus transducer carries out to the signal receiving the DPD processor that analog-to-digital conversion obtains feedback digital signal and exports DPD MCPA to.
A kind of MCPA equipment, comprise the radio frequency down-conversion device, analog to digital converter, DPD processor, digital to analog converter, radio-frequency-up-converter, Multi-Carrier Power Amplifier and the coupler that connect successively, also comprise the feedback device of above-mentioned DPD MCPA, described coupler connects the radio frequency band filter of described feedback device, and the feedback modulus transducer of described feedback device is connected with described DPD processor.
The feedback device of above-mentioned DPD MCPA and MCPA equipment, radio frequency band filter receives the feedback radiofrequency signal of DPD MCPA to carry out exporting feedback down-conversion device to after filtering processing.The feedback intermediate-freuqncy signal of feedback down-conversion device output is delivered to feedback modulus transducer after if bandpas filter filtering.Feedback modulus transducer carries out to the signal receiving the DPD processor that analog-to-digital conversion obtains feedback digital signal and exports DPD MCPA to, the reference data of processing as DPD.In the time that radiofrequency signal bandwidth increases, owing to having removed the intermodulation clutter comprising in feedback radiofrequency signal by radio frequency band filter, can avoid intermodulation clutter to process generation to DPD and disturb and cause overcorrect, can effectively prevent that linear index from reducing.In addition the feedback intermediate-freuqncy signal that if bandpas filter sends feedback down-conversion device is carried out filtering again, removes the non-carrier-in-interference signal in feedback intermediate-freuqncy signal, and further clutter reduction disturbs, and improves calibration accuracy.
Brief description of the drawings
Fig. 1 is the structure chart of the feedback device of DPD MCPA in an embodiment;
Fig. 2 is the structure chart of MCPA equipment in an embodiment.
Embodiment
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.A lot of details are set forth in the following description so that fully understand the utility model.But the utility model can be implemented to be much different from alternate manner described here, those skilled in the art can do similar improvement without prejudice to the utility model intension in the situation that, and therefore the utility model is not subject to the restriction of following public specific embodiment.
Unless otherwise defined, all technology that use are herein identical with the implication that belongs to the common understanding of those skilled in the art of the present utility model with scientific terminology.The term using in specification of the present utility model herein, just in order to describe the object of specific embodiment, is not intended to be restriction the utility model.Term as used herein " and/or " comprise one or more relevant Listed Items arbitrarily with all combinations.
A feedback device of DPD MCPA, as shown in Figure 1, comprises the radio frequency band filter 110, feedback down-conversion device 120, if bandpas filter 130 and the feedback modulus transducer 140 that connect successively.
Radio frequency band filter 110 receives the feedback radiofrequency signal of DPD MCPA to carry out exporting feedback down-conversion device 120 to after filtering.Feedback down-conversion device 120 carries out down-converted to the signal receiving, export the orthogonal feedback intermediate-freuqncy signal of I/Q to if bandpas filter 130, if bandpas filter 130 carries out exporting feedback modulus transducer 140 to after filtering to feedback intermediate-freuqncy signal, and feedback modulus transducer 140 carries out to the signal receiving the DPD processor that analog-to-digital conversion obtains feedback digital signal and exports DPD MCPA to.
The filtering frequency range of radio frequency band filter 110 is corresponding with the digital pre-distortion processing frequency range of DPD processor in DPD MCPA, in the time that the radiofrequency signal bandwidth of DPD MCPA processing increases, after amplifying, the radiofrequency signal of output can produce intermodulation clutter, and is contained in the feedback signal that obtains of coupling.The intermodulation clutter that radio frequency band filter 110 comprises for filtering feedback radiofrequency signal, avoids intermodulation clutter to process generation interference and cause overcorrect DPD.In the present embodiment, radio frequency band filter 110 can be microstrip filter or ceramic filter, good stability, and antijamming capability is strong.
The filtering frequency range of if bandpas filter 130 is corresponding with the carrier frequency band of the feedback radiofrequency signal that coupling obtains, for the signal beyond filtering carrier frequency band.The feedback intermediate-freuqncy signal that if bandpas filter 130 sends feedback down-conversion device 120 is carried out filtering again, removes the non-carrier-in-interference signal in feedback intermediate-freuqncy signal, and further clutter reduction disturbs, and improves the calibration accuracy of DPD processor in DPD MCPA.The present embodiment if bandpas filter 130 can adopt LC filter, and cost simple in structure is low.
The signal that feedback modulus transducer 140 sends if bandpas filter 130 carries out analog-to-digital conversion and obtains feedback digital signal output, the reference data of processing as DPD.In the present embodiment, feedback modulus transducer 140 is the analog to digital converter that successively compares type, and conversion speed is high, low in energy consumption, has improved signal treatment effeciency, has reduced equipment power dissipation.
The feedback device of above-mentioned DPD MCPA, radio frequency band filter 110 carries out exporting feedback down-conversion device 120 to after filtering processing to the feedback radiofrequency signal receiving.The feedback intermediate-freuqncy signal that feedback down-conversion device 120 is exported is delivered to feedback modulus transducer 140 after if bandpas filter 130 filtering.Feedback modulus transducer 140 carries out to the signal receiving the DPD processor that analog-to-digital conversion obtains feedback digital signal and exports DPD MCPA to, the reference data of processing as DPD.In the time that radiofrequency signal bandwidth increases, owing to having removed the intermodulation clutter comprising in feedback radiofrequency signal by radio frequency band filter 110, can avoid intermodulation clutter to process generation to DPD and disturb and cause overcorrect, can effectively prevent that linear index from reducing.
The utility model also provides a kind of MCPA equipment, as shown in Figure 2, comprise the radio frequency down-conversion device 210, analog to digital converter 220, DPD processor 230, digital to analog converter 240, radio-frequency-up-converter 250, Multi-Carrier Power Amplifier 260 and the coupler 270 that connect successively, also comprise the feedback device 100 of above-mentioned DPD MCPA.Coupler 270 connects the radio frequency band filter 110 of feedback device 100, and the feedback modulus transducer 140 of feedback device 100 is connected with DPD processor 230.
Radio frequency down-conversion device 210 received RF input signals, carry out down-converted to radio-frequency input signals and obtain analog if signal, and are sent to analog to digital converter 220.
Analog to digital converter 220 carries out analog-to-digital conversion to analog if signal, obtains digital medium-frequency signal and is sent to DPD processor 230.In the present embodiment, analog to digital converter 220 can be the analog to digital converter that successively compares type equally, and conversion speed is high, low in energy consumption, has improved signal treatment effeciency, has reduced equipment power dissipation.
DPD processor 230 receives digital medium-frequency signal and feedback digital signal, and exports digital predistortion signal to digital to analog converter 240.Particularly, the feedback digital signal that DPD processor 230 sends according to feedback modulus transducer 140, carries out pre-distortion to digital medium-frequency signal, obtains digital predistortion signal and is sent to digital to analog converter 240.
Digital to analog converter 240 carries out digital-to-analogue conversion processing to digital predistortion signal, obtains the analog if signal after predistortion and is sent to radio-frequency-up-converter 250.In the present embodiment, digital to analog converter 240 can be the digital to analog converter of Voltage-output type, and conversion speed is fast, has improved signal treatment effeciency.
Radio-frequency-up-converter 250 receives the analog if signal after predistortion, and exports predistortion RF signal to Multi-Carrier Power Amplifier 260.Be in the present embodiment, to utilize radio-frequency-up-converter 250 to carry out upconversion process to the analog if signal after predistortion, obtain and export predistortion RF signal to Multi-Carrier Power Amplifier 260.
Multi-Carrier Power Amplifier 260 amplifies processing to predistortion RF signal, obtains radio frequency output signal and exports through coupler 270.Predistortion RF signal is carried out to power amplification, obtain radio frequency output signal, realize the power amplification to radio-frequency input signals.
The radio frequency output signal that coupler 270 is exported Multi-Carrier Power Amplifier 260 is sampled, and a part of obtaining radio frequency output signal is sent to radio frequency band filter 110 as feedback radiofrequency signal.
The intermodulation clutter comprising in radio frequency band filter 110 filtering feedback radiofrequency signals, prevents that intermodulation clutter from dropping in multiple Nyquist district of feedback modulus transducer 140.Feedback radiofrequency signal is fed after analog to digital converter 140 samplings, signal in multiple outer Nyquist district is all adopted while getting back in a Nyquist district can avoid intermodulation clutter to be also contained in main signal, thereby avoids intermodulation clutter to process generation interference and cause overcorrect DPD.In the present embodiment, coupler 270 is directional coupler, and transmission frequency bandwidth, isolation are good and low in energy consumption.Feedback modulus transducer 140 is exported feedback digital signal to DPD processor 230, the reference data of processing as DPD.
Above-mentioned MCPA equipment, the feedback radiofrequency signal that radio frequency band filter 110 sends coupler 270 carries out exporting feedback down-conversion device 120 to after filtering processing.The feedback intermediate-freuqncy signal that feedback down-conversion device 120 is exported is delivered to feedback modulus transducer 140 after if bandpas filter 130 filtering.Feedback modulus transducer 140 carries out analog-to-digital conversion to the signal receiving and obtains feedback digital signal and be sent to DPD processor 230, the reference data of processing as DPD.In the time that radiofrequency signal bandwidth increases, owing to having removed the intermodulation clutter comprising in feedback radiofrequency signal by radio frequency band filter 110, can avoid intermodulation clutter to process generation to DPD and disturb and cause overcorrect, can effectively prevent that linear index from reducing.In addition the feedback intermediate-freuqncy signal that if bandpas filter 130 sends feedback down-conversion device 120 is carried out filtering again, removes the non-carrier-in-interference signal in feedback intermediate-freuqncy signal, and further clutter reduction disturbs, and improves calibration accuracy.
The above embodiment has only expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (8)
1. a feedback device of DPD MCPA, is characterized in that, comprises the radio frequency band filter, feedback down-conversion device, if bandpas filter and the feedback modulus transducer that connect successively,
Described radio frequency band filter receives the feedback radiofrequency signal of DPD MCPA to carry out exporting described feedback down-conversion device to after filtering, described feedback down-conversion device output feedback intermediate-freuqncy signal is to described if bandpas filter, described if bandpas filter carries out exporting described feedback modulus transducer to after filtering to described feedback intermediate-freuqncy signal, and described feedback modulus transducer carries out to the signal receiving the DPD processor that analog-to-digital conversion obtains feedback digital signal and exports DPD MCPA to.
2. the feedback device of DPD MCPA according to claim 1, is characterized in that, described radio frequency band filter is microstrip filter or ceramic filter.
3. the feedback device of DPD MCPA according to claim 1, is characterized in that, described if bandpas filter is LC filter.
4. the feedback device of DPD MCPA according to claim 1, is characterized in that, described feedback modulus transducer is the analog to digital converter that successively compares type.
5. a MCPA equipment, it is characterized in that, comprise the radio frequency down-conversion device, analog to digital converter, DPD processor, digital to analog converter, radio-frequency-up-converter, Multi-Carrier Power Amplifier and the coupler that connect successively, also comprise the feedback device of the DPD MCPA described in claim 1 to 4 any one, described coupler connects the radio frequency band filter of described feedback device, and the feedback modulus transducer of described feedback device is connected with described DPD processor.
6. MCPA equipment according to claim 5, is characterized in that, described analog to digital converter is the analog to digital converter that successively compares type.
7. MCPA equipment according to claim 5, is characterized in that, described digital to analog converter is the digital to analog converter of Voltage-output type.
8. according to the MCPA equipment described in claim 5 to 7 any one, it is characterized in that, described coupler is directional coupler.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420009834.4U CN203775240U (en) | 2014-01-07 | 2014-01-07 | DPD MCPA (Digital Pre-Distortion Multi-Carrier Power Amplifier) feedback device and MCPA equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420009834.4U CN203775240U (en) | 2014-01-07 | 2014-01-07 | DPD MCPA (Digital Pre-Distortion Multi-Carrier Power Amplifier) feedback device and MCPA equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743491B (en) * | 2014-12-08 | 2018-09-28 | 核工业西南物理研究院 | Microwave source system and its Microwave Diagnostics System based on filtering feedback locking phase |
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2014
- 2014-01-07 CN CN201420009834.4U patent/CN203775240U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105743491B (en) * | 2014-12-08 | 2018-09-28 | 核工业西南物理研究院 | Microwave source system and its Microwave Diagnostics System based on filtering feedback locking phase |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 510663 No. 10 Shenzhou Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 No. 10 Shenzhou Road, Science City, Luogang District, Guangzhou City, Guangdong Province Patentee before: COMBA TELECOM SYSTEMS (CHINA) Ltd. |
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| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140813 |
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| CX01 | Expiry of patent term |