CN201830205U - TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) digital predistortion power amplifier - Google Patents
TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) digital predistortion power amplifier Download PDFInfo
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- CN201830205U CN201830205U CN2010205582097U CN201020558209U CN201830205U CN 201830205 U CN201830205 U CN 201830205U CN 2010205582097 U CN2010205582097 U CN 2010205582097U CN 201020558209 U CN201020558209 U CN 201020558209U CN 201830205 U CN201830205 U CN 201830205U
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Abstract
The utility model provides a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) digital predistortion power amplifier comprising a signal processing unit, a digital predistortion power amplifier unit, and a digital demodulation control unit, wherein the signal processing unit conducts frequency conversion, analog-to-digital conversion and compression peak-to-average ratio processing on signals; the digital predistortion power amplifier unit conducts pre-correction processing on the signals; the signal processing unit is connected with the digital predistortion power amplifier unit; the digital demodulation control unit is used for demodulating downstream each-time-slot occupying state information distributed by a base station, and controlling the on and off of the power amplifier; and one end of the digital demodulation control unit is connected with the signal processing unit, and the other end is connected with the digital predistortion power amplifier unit. The power amplifier can obtain the current downstream each-time-slot occupying state information distributed by the base station, and control the on and off of the power amplifier, so that the power amplifier can be kept at the on state at a current occupying time slot and at the off state at an idle time slot to further reduce the power consumption of equipment, and save a great deal of the power consumption of the equipment.
Description
[technical field]
The utility model relates to a kind of power amplifier, particularly a kind of power amplifier of linearization process.
[background technology]
In mobile communication system, for the signal that guarantees certain limit covers, we use power amplifier to come signal is amplified usually, and then launch by radio-frequency front-end and antenna system.But along with the continuous development of communication modulating technology, the peak-to-average force ratio of modulation signal improves greatly, and this linear index for power amplifier has proposed new requirement.In order effectively to solve power amplifier because effect of nonlinear produces the spectral re-growth effect, must carry out linearization process to it, it can solve the spectral re-growth problem of signal preferably.Realize that the linearizing method of radio-frequency power amplifier is generally digital pre-distortion method, digital pre-distortion is because operating frequency is low, can realize with digital circuit, adaptability is strong, and can offset the high-order intermodulation distortion by increasing sample rate and increasing the way that quantizes exponent number, it is little that this technology has a volume, efficient height, advantage such as adaptive ability is strong.Therefore, this linearization technique has development prospect most.
As shown in Figure 1, a kind of circuit theory diagrams of common digital pre-distorting power amplifier.It comprises signal processing unit 1, digital pre-distortion power amplifying unit 2.The input port of this power amplifier is a radiofrequency signal, is fit to be applied in repeater, the tower amplifier equipment.The upper and lower converter unit of the radio frequency of this power amplifier adopts independently local oscillator respectively.Described signal processing unit 1 is treated to intermediate-freuqncy signal with the radiofrequency signal of input through first down-conversion 11, after described intermediate-freuqncy signal is carried out the outer unwanted signal of bandpass filtering removal band by first filter 12 again, through A/D converter 13, Digital Down Convert 14 backs are zero intermediate frequency signals, enter peak clipping unit 15 then and carry out the peak-to-average force ratio compression processing of digital signal, to improve back level Doherty (doherty) power amplification efficiency.First local oscillation circuit 16 can be adjusted accordingly according to the different frequency of input radio frequency signal, so that the intermediate-freuqncy signal centre frequency after first down-conversion remains unchanged.
Described digital pre-distortion power amplifying unit 2, signal after the peak clipping is inputed to digital pre-distortion unit 21 finish precorrection input signal, after passing through D/A converter 22, up-conversion 23, second filter 24 more successively, amplify at last to radio frequency delivery outlet (not shown) by power amplifier unit 25 at last.Simultaneously after feedback path inputs to second down-conversion 27, the 3rd filter 28, second A/D converter 29 respectively through coupler 26 coupling unit power amplifier signals, enter an end of digital predistortion adaptation controller 20, the other end of digital predistortion adaptation controller 20 extracts 15 raw digital signal of handling through the peak clipping unit, adjust digital pre-distortion unit 21 by the signal after comparing raw digital signal and handling, feasible precorrection effect to power amplifier reaches optimum state, realizes the function of closed-loop adaptation control.Second local oscillation circuit 231 and the 3rd local oscillation circuit 271 can independently be adjusted respectively flexibly, can both export comparatively pure spectrum signal by unwanted signals such as second filter 24 and the 28 filtering mirror image interference of the 3rd filter when adapting to different radio frequency signal frequency.
Although adopt the circuit of the predistortion scheme of Fig. 1 to have through peak clipping processing and predistortion correction, make the efficient and the linear index of whole digital pre-distorting power amplifier all obtain improving largely, if but when being applied in the time slot signal system of TDD standard, base station crack no signal output at one's leisure, and power amplifier still has quiescent dissipation at this idle time slot, particularly in the relatively notr busy time period of traffic carrying capacity, its quiescent dissipation amount proportion is particularly outstanding.Greatly reduce the energy-efficient performance of equipment like this.
[utility model content]
The technical problems to be solved in the utility model is to provide a kind of TD-SCDMA digital pre-distorting power amplifier, and it can reach the purpose of further reduction equipment power dissipation.
The utility model is achieved in that
A kind of TD-SCDMA digital pre-distorting power amplifier of the utility model, it comprises: a pair of signal carries out the signal processing unit of frequency conversion, analog-to-digital conversion, the processing of compression peak-to-average force ratio; A pair of signal carries out the digital pre-distortion power amplifying unit that precorrection is handled; Described signal processing unit connects described digital pre-distortion power amplifying unit, and it also comprises: descending each the Time Slot Occupancy state information of a demodulation base station assigns, and control the digital demodulation control unit that power amplifier opens or closes; Described digital demodulation control unit one end connects described signal processing unit, and the other end connects described digital pre-distortion power amplifying unit.
Further, described digital demodulation control unit comprises connection successively: digital demodulation unit and timing control signal generation unit.
Further, described signal processing unit comprises connection successively: first down-conversion, first filter, A/D converter, Digital Down Convert and peak clipping unit, described first down-conversion connects first local oscillation circuit, and described Digital Down Convert connects described digital demodulation unit.
Further, described digital pre-distortion power amplifying unit comprises connection successively: digital pre-distortion cells D/A transducer, up-conversion, second filter, power amplifier unit, described power amplifier unit connects second down-conversion by coupler, described second down-conversion is by the 3rd filter, second A/D converter, the digital predistortion adaptation controller is connected to the digital pre-distortion unit, described up-conversion connects second local oscillation circuit, second down-conversion connects the 3rd local oscillation circuit, described digital pre-distortion unit, the digital predistortion adaptation controller all connects described peak clipping unit, and described power amplifier unit connects described timing control signal generation unit.
Advantage of the present utility model is:
1. the utility model makes the efficient of whole digital pre-distorting power amplifier and linear index all obtain improving largely through peak clipping processing and predistortion correction;
2. the utility model has adopted signal feedback, the digital predistortion adaptation controller is adjusted the digital pre-distortion unit by the signal after comparing raw digital signal and handling, feasible precorrection effect to power amplifier reaches optimum state, has realized the function of closed-loop adaptation control;
3. digital demodulation control unit of the present utility model can be realized by demodulation base station common signal channel parameter information, thereby get access to current descending each the Time Slot Occupancy state information of distributing in base station, and the switching that produces a way word timing control signal control power amplifiers, make it be in opening at the current time slot that takies, the crack is in off state at one's leisure, to reach the purpose of further reduction equipment power dissipation, saved the power consumption of equipment in a large number.
[description of drawings]
In conjunction with the embodiments the utility model is further described with reference to the accompanying drawings.
Fig. 1 is the circuit theory diagrams of existing digital pre-distorting power amplifier.
Fig. 2 is circuit theory diagrams of the present utility model.
[embodiment]
Consulting Fig. 2 is described in detail the utility model embodiment.
As shown in Figure 2, the utility model embodiment comprises the signal processing unit 1 that signal is carried out frequency conversion, analog-to-digital conversion, the processing of compression peak-to-average force ratio; Signal is carried out the digital pre-distortion power amplifying unit 2 that precorrection is handled; Descending each the Time Slot Occupancy state information of demodulation base station assigns, and control the digital demodulation control unit 3 that power amplifier opens or closes; Described signal processing unit 1 connects described digital pre-distortion power amplifying unit 2, and described digital demodulation control unit 3 one ends connect described signal processing unit 1, and the other end connects described digital pre-distortion power amplifying unit 2.
Described signal processing unit 1 comprises connection successively: first down-conversion, 11, the first filters 12, and A/D converter 13, Digital Down Convert 14 and peak clipping unit 15, described first down-conversion 11 connects first local oscillation circuit 16.Described digital pre-distortion power amplifying unit 2 comprises connection successively: digital pre-distortion unit 21, D/A converter 22, up-conversion 23, second filter 24, power amplifier unit 25, described power amplifier unit 25 connects second down-conversion 27 by coupler 26, described second down-conversion 27 is by the 3rd filter 28, second A/D converter 29, digital predistortion adaptation controller 20 is connected to digital pre-distortion unit 21, described up-conversion 23 connects second local oscillation circuit 231, second down-conversion 27 connects the 3rd local oscillation circuit 271, described digital pre-distortion unit 21, digital predistortion adaptation controller 20 all connects described peak clipping unit 15.
Described digital demodulation control unit 3 comprises connection successively: digital demodulation unit 31 and timing control signal generation unit 32, described digital demodulation unit 31 connects described Digital Down Convert 14, and described timing control signal generation unit 32 connects described power amplifier unit 25.
Principle of the present utility model is as follows:
Described signal processing unit 1 is treated to intermediate-freuqncy signal with the radiofrequency signal of input through first down-conversion 11, after carrying out the outer unwanted signal of bandpass filtering removal band by first filter 12 again, through A/D converter 13, Digital Down Convert 14 backs are zero intermediate frequency signals, enter peak clipping unit 15 then and carry out the peak-to-average force ratio compression processing of digital signal, to improve back level Doherty (doherty) power amplification efficiency.First local oscillation circuit 16 can be adjusted accordingly according to the different frequency of input radio frequency signal, so that the intermediate-freuqncy signal centre frequency after first down-conversion remains unchanged.
Described digital pre-distortion power amplifying unit 2, signal after the peak clipping is inputed to digital pre-distortion unit 21 finish precorrection input signal, after passing through D/A converter 22, up-conversion 23, second filter 24 more successively, amplify at last to radio frequency delivery outlet (not shown) by power amplifier unit 25 at last.Simultaneously after feedback path inputs to second down-conversion 27, the 3rd filter 28, second A/D converter 29 respectively through coupler 26 coupling unit power amplifier signals, enter an end of digital predistortion adaptation controller 20, the other end of digital predistortion adaptation controller 20 extracts 15 raw digital signal of handling through the peak clipping unit, adjust digital pre-distortion unit 21 by the signal after comparing raw digital signal and handling, feasible precorrection effect to power amplifier reaches optimum state, realizes the function of closed-loop adaptation control.Second local oscillation circuit 231 and the 3rd local oscillation circuit 271 can independently be adjusted respectively flexibly, can both export comparatively pure spectrum signal by unwanted signals such as second filter 24 and the 28 filtering mirror image interference of the 3rd filter when adapting to different radio frequency signal frequency.
Described digital demodulation control unit 3 inputs to digital demodulation unit 31 with the signal of Digital Down Convert 14, solve base station common signal channel parameter information, thereby get access to current descending each the Time Slot Occupancy state information of distributing in base station, parse a 5ms synchronizing sub-frame signal simultaneously, and inputing to timing control signal generation unit 32, final output power amplifier enables control signal and gives power amplifier unit 25 after calculation process.With the switching of this control power amplifiers, make it be in opening at the current time slot that takies, the crack is in off state at one's leisure, to reach the purpose of further reduction equipment power dissipation, has saved the power consumption of equipment in a large number.
The above, it only is the utility model preferred embodiment, so can not limit the scope that the utility model is implemented according to this, i.e. the equivalence of doing according to the utility model claim and description changes and modifies, and all should still belong in the scope that the utility model contains.
Claims (4)
1. TD-SCDMA digital pre-distorting power amplifier, it comprises: a pair of signal carries out the signal processing unit that frequency conversion, analog-to-digital conversion, compression peak-to-average force ratio are handled; A pair of signal carries out the digital pre-distortion power amplifying unit that precorrection is handled; Described signal processing unit connects described digital pre-distortion power amplifying unit, it is characterized in that it also comprises:
Descending each the Time Slot Occupancy state information of one demodulation base station assigns, and control the digital demodulation control unit that power amplifier opens or closes;
Described digital demodulation control unit one end connects described signal processing unit, and the other end connects described digital pre-distortion power amplifying unit.
2. a kind of TD-SCDMA digital pre-distorting power amplifier according to claim 1 is characterized in that: described digital demodulation control unit comprises successively and to connect: digital demodulation unit and timing control signal generation unit.
3. a kind of TD-SCDMA digital pre-distorting power amplifier according to claim 1 and 2, it is characterized in that: described signal processing unit comprises successively and to connect: first down-conversion, first filter, A/D converter, Digital Down Convert and peak clipping unit, described first down-conversion connects first local oscillation circuit, and described Digital Down Convert connects described digital demodulation unit.
4. a kind of TD-SCDMA digital pre-distorting power amplifier according to claim 1 and 2, it is characterized in that: described digital pre-distortion power amplifying unit comprises successively and to connect: the digital pre-distortion unit, D/A converter, up-conversion, second filter, power amplifier unit, described power amplifier unit connects second down-conversion by coupler, described second down-conversion is by the 3rd filter, second A/D converter, the digital predistortion adaptation controller is connected to the digital pre-distortion unit, described up-conversion connects second local oscillation circuit, second down-conversion connects the 3rd local oscillation circuit, described digital pre-distortion unit, the digital predistortion adaptation controller all connects described peak clipping unit, and described power amplifier unit connects described timing control signal generation unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205582097U CN201830205U (en) | 2010-10-13 | 2010-10-13 | TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) digital predistortion power amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205582097U CN201830205U (en) | 2010-10-13 | 2010-10-13 | TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) digital predistortion power amplifier |
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| CN201830205U true CN201830205U (en) | 2011-05-11 |
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| CN2010205582097U Expired - Fee Related CN201830205U (en) | 2010-10-13 | 2010-10-13 | TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) digital predistortion power amplifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190885A (en) * | 2019-05-28 | 2019-08-30 | 清华大学 | Based on airspace feedback towards the digital pre-distortion structure for mixing extensive MIMO array |
| CN110611534A (en) * | 2019-09-10 | 2019-12-24 | 三维通信股份有限公司 | Optical fiber repeater and method and system for detecting passive intermodulation signal thereof |
-
2010
- 2010-10-13 CN CN2010205582097U patent/CN201830205U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110190885A (en) * | 2019-05-28 | 2019-08-30 | 清华大学 | Based on airspace feedback towards the digital pre-distortion structure for mixing extensive MIMO array |
| CN110611534A (en) * | 2019-09-10 | 2019-12-24 | 三维通信股份有限公司 | Optical fiber repeater and method and system for detecting passive intermodulation signal thereof |
| CN110611534B (en) * | 2019-09-10 | 2021-03-23 | 三维通信股份有限公司 | Optical fiber repeater and method and system for detecting passive intermodulation signal thereof |
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| 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 |
Granted publication date: 20110511 Termination date: 20151013 |
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| EXPY | Termination of patent right or utility model |