CN101594337B - Device for generating pre-distorted signals - Google Patents
Device for generating pre-distorted signals Download PDFInfo
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- CN101594337B CN101594337B CN 200810028320 CN200810028320A CN101594337B CN 101594337 B CN101594337 B CN 101594337B CN 200810028320 CN200810028320 CN 200810028320 CN 200810028320 A CN200810028320 A CN 200810028320A CN 101594337 B CN101594337 B CN 101594337B
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Abstract
The invention discloses a device for generating pre-distorted signals, which can receive the input of an initial carrier signal of a first coupler and a combined signal of a second coupler, wherein the combined signal is formed by the initial carrier signal which is processed by power amplification and includes an intermodulation signal. The device comprises a delay timer, a second quadrature bridge, a third quadrature bridge, a first adjusting device, a second adjusting device and a fourth quadrature bridge, wherein the delay timer is used for delaying the initial carrier signal and synchronizing the initial carrier signal with the combined signal; the second quadrature bridge is used for dividing the delayed signal; the third quadrature bridge is used for combing a first path output of the second quadrature bridge and the combined signal to offset the carrier signal to output the intermodulation signal; the first adjusting device is used for fine-adjusting the intermodulation signal of the third quadrature bridge; the second adjusting device is used for fine-adjusting the second path output signal of the second quadrature bridge; the fourth quadrature bridge is used for forming a pre-distorted signal by combining the adjusted carrier signal and the intermodulation signal. The device can achieve higher working bandwidth and working efficiency when applied to a pre-distorted radio frequency amplifier and can be applied to different working environments.
Description
[technical field]
The present invention relates to Modern Mobile Communications Systems intermediate power amplifier field, relate in particular to a kind of device for generating pre-distorted signals.
[technical background]
For a long time, the efficient that is used for the power amplifier of communication system develops skill and linearization technique is the focus of industry research.
Modern wireless communication systems is owing to having adopted the modulation system of various non-constant envelopes (such as QPSK, QAM, OFDM etc.), greatly improved the utilance of frequency resource, transmission rate under the wireless environment is along with the update (2G of equipment, 2.5G, 3G, 4G, LTE) rapid growth, down link all needs high efficiency, high power amplifier linear, multicarrier to amplify to satisfy the covering requirement of base station (long-distance radio frequency unit RRU, repeater, indoor covering system etc.) equipment in system.
Known, it is several that the linearization technique of power amplifier is divided into feedforward, feedback and predistortion etc. by different Technical Architectures, pre-distortion technology is divided into again analog predistortion and digital pre-distortion, analog predistortion refers to utilize analog circuit to produce distorted signal in radio frequency domains, and digital pre-distortion refers to produce pre-distorted signals and upconvert to radio frequency domains on the basis of the numeric field of baseband signal.
Because the non-constant envelope signal of modulation technique will make power amplifier produce larger nonlinear characteristic, the conventional Multi-Carrier Power Amplifier that adopts feedforward (FF) Technical Architecture, although have that cancellation performance is good, bandwidth of operation is wide, the characteristics such as can multi-modulation scheme hold altogether, but, because the technical sophistication degree is high, efficient is low, the high in cost of production factor has restricted its development.
The analog predistortion technologies such as envelope-tracking can not be operated in the situation of multicarrier owing to being subject to the impact that bandwidth of operation is narrow, offset the factors such as weak effect.
Digital pre-distortion technology is a kind of more promising linearization technique, have high efficiency and moderate characteristics that offset, but owing to being subject to people to the restriction of the understanding of the non-linear table intrinsic characteristics of semiconductor device and the restriction of the operating rates such as A/D, D/A, DSP, bandwidth of operation is limited, and its application has been subject to certain restriction.
In addition, the angle of no matter still putting into practice from theory, the patent documentation that relates to digital pre-distortion technology both at home and abroad all discloses, the complexity that produces digital predistortion signal in the prior art is higher, and fail the self adaptation adjustment and adapt to different electric circumstances, therefore fail to reach preferably linearization technique effect.
[summary of the invention]
Purpose of the present invention will overcome above-mentioned deficiency exactly, a kind of device for generating pre-distorted signals is provided, be applied in the pre-distorted radio frequency amplifier, produce pre-distorted signals in order to carrier signal is amplified in radio frequency domains, realize higher bandwidth of operation and operating efficiency, and can be fit to be applied to different operational environments.
For realizing this purpose, the present invention adopts following technical scheme:
A kind of device for generating pre-distorted signals of the present invention, acceptance is from the original carrier signal of the first coupler with from the input of closing signal behind the road of the second coupler, be used for producing pre-distorted signals in radio frequency domains, signal was comprised by the original carrier signal formation that has carried out power amplification and included intermodulation signal after this closed the road:
Delayer, the second quadrature bridge, the first adjusting device, the second adjusting device, the 3rd quadrature bridge and the 4th quadrature bridge,
Delayer, will from the original carrier signal of the first coupler delay time to keep with described from the second coupler close the road after signal synchronous in time;
The second quadrature bridge, the signal that delayer is exported carries out shunt output;
The 3rd quadrature bridge closes the output of the first via of the second quadrature bridge and the signal behind the road of closing from the second coupler to export intermodulation signal after the road offsets wherein carrier signal;
The first adjusting device will be finely tuned from the intermodulation signal of the 3rd quadrature bridge;
The second adjusting device will be finely tuned from the second tunnel output signal of the second quadrature bridge;
The 4th quadrature bridge closes the road to form described pre-distorted signals with the carrier signal of the first adjusting device and the intermodulation signal of the second adjusting device output.
Described the first adjusting device comprises attenuator, and the intermodulation signal from the 3rd quadrature bridge is carried out the intensity adjustment.
Described the first adjusting device also comprises phase shifter, and the intermodulation signal from this attenuator is carried out the intensity adjustment.
Described the second adjusting device comprises power amplifier, and the second tunnel signal of exporting from the second quadrature bridge is carried out power amplification.
Described the second adjusting device also comprises the automatic control electric controlled attenuator, and the signal that its signal that utilizes a wave detector to detect the described power amplifier output of the second adjusting device is exported power amplifier carries out automatic fine to be regulated with correction signal intensity.
Described the second adjusting device also comprises phase shifter, and the signal that the automatic control electric controlled attenuator is exported carries out micro-phase modulation.
The phase shifter that described the second adjusting device adopts is voltage controlled phase shifter.
Be prepended to described the 3rd quadrature bridge, also be provided with closing from the second coupler that signal carries out the attenuator that intensity is adjusted behind the road.
The described first, second, third and the 4th quadrature bridge all adopts 90 degree 3db electric bridges.
Compared with prior art, advantage of the present invention is mainly manifested in three aspects:
At first, the pre-distorted signals that produces not is the intermodulation signal for amplifier, not only comprised carrier signal simultaneously but also comprised intermodulation signal in its output signal, when it is applied to pre-distorted radio frequency amplifier, the architectural framework of middle employing, the performance index that obtain (offseting effect, working is Time Bandwidth, operating efficiency) are: in the 2100MHz frequency range, can under the instant bandwidth of operation of 60MHz, produce the effect that offsets of 20dBc, in the 800MHz frequency range, can under the instant bandwidth of operation of 25MHz, produce the effect that offsets of 20dBc; Owing to not needing to adopt error amplifier, so operating efficiency has raising by a relatively large margin, ideally, can reach the efficiency index of digital pre-distortion technology;
Secondly, bandwidth of operation is wider, can satisfy all wireless communication frequency band bandwidth that existing ITU divides;
At last, compare with existing feedforward and digital pre-distortion technology, the technical sophistication degree is low and larger cost advantage arranged.
[description of drawings]
Fig. 1 is a kind of theory diagram of device for generating pre-distorted signals;
Fig. 2 is the theory diagram of pre-distortion unit among Fig. 1.
[embodiment]
The present invention is further illustrated below in conjunction with drawings and Examples:
See also Fig. 1, the device for generating pre-distorted signals that its linearization technique that has disclosed the device for generating pre-distorted signals according to the present invention is realized, this kind device for generating pre-distorted signals can be directly used in the Mobile communication direct base station (not shown), up link and/or the down link of access repeater, upward signal and/or downstream signal in radio frequency domains are carried out power amplification, omnidistance processing is all complete in radio frequency domains, need not digitized processing.
Among Fig. 1, the indicated direction of arrow RFin is the input direction of radio frequency original carrier signal, and arrow RFout then indicates the outbound course of this radio frequency original carrier signal after two link processing.
In the device for generating pre-distorted signals, towards the RFin indicated direction, the original carrier signal is at first finely tuned to proofread and correct its signal strength signal intensity at attenuator 11 places, then export a power amplifier 12 to, it adopts class-a amplifier that this original carrier signal is amplified in advance, then punishes into two paths of signals at the first coupler 21 and enters two radio frequency links and process respectively.
The first link is straight-through link, in this link, the original carrier signal attenuator 31 of at first flowing through carries out signal strength signal intensity trace and regulates, then carry out micro-phase shift (though indication phase shifter of the present invention can adopt the fixed phase shifter of secured adjusted amount through phase shifter 32, but preferably can adopt voltage controlled phase shifter, lower same), amplify in advance through a class-a amplifier 33 again, carrying out power amplification finally by continuous two stage power amplifier 34 and 35 processes, become amplified signal output, this amplified signal has comprised the intermodulation signal that original carrier signal and original carrier signal form in link, become a kind of mixed signal.Described two stage power amplifier 34 and 35 adopts the AB power-like amplifier.Jointly form the first power amplification device by attenuator 31, phase shifter 32, class-a amplifier 33, two stage power amplifier 34 and 35, its processing procedure to signal will be applied in the second following link symmetrically.
Amplified signal further with following the second link in after the amplification that produces pre-distorted signals in the first quadrature bridge 5, close the road, form close the road after signal export towards the RFout direction through circulator 3.
In the first link because the different characteristic of each electronic device, can make close the road after signal generate intermodulation signal, also be distorted signal, to close behind the road in the signal noise proportional higher thereby make, the processing of these intermodulation signals can be cooperated by the second link and be solved.
In the second link, at first, by the described original carrier signal of described the first coupler 21 couplings, the signal behind the road that closes by 5 outputs of described the first quadrature bridge of the second coupler 22 coupling, the two-way carrier signal is closed the road and is processed at pre-distortion unit 6 places, formation has comprised the pre-distorted signals that described intermodulation signal and original carrier signal mix, with described the second coupler 22 obtain close the road after signal compare, the intensity of pre-distorted signals is attenuated, and its phase place, time delay etc. also all are corrected.
After pre-distorted signals produces, export the second power amplification device to, the first power amplification device full symmetric in the second power amplification device and described the first link, pre-distorted signals is equivalent to the amplification of above-mentioned the first power amplification device, for this reason, the second power amplification device adopts and the identical electronic device structure of the first power amplification device, comprises attenuator 41, phase shifter 42, class-a amplifier 43, the two stage power amplifier 44 and 45 of successively electric connection by the path of pre-distorted signals transmission.After the equivalence amplification through the second power amplification device, form and amplify rear pre-distorted signals.
Because in the processing procedure of the various electronic devices of pre-distortion unit 6 and the second power amplification device, can adjust the phase place of its carrier signal that comprises and intermodulation signal, thereby, make the pre-distorted signals carrier signal that comprises and the intermodulation signal that comprises differ 180 degree in phase place, make that amplified signal differs 90 degree in phase place in carrier signal that pre-distorted signals comprises and the first link, because the carrier signal and its intermodulation signal homophase that comprises that comprise in the amplified signal of the first link, so, the carrier signal that the pre-distorted signals of the carrier signal that the amplified signal of the first link comprises and the second link comprises, mutually stack in the process of closing the road through described the first quadrature bridge 5, and the intermodulation signal that the pre-distorted signals of the intermodulation signal that the amplified signal of the first link comprises and the second link comprises is owing to passing by in the journey closing, both differ 180 degree in phase place, and amplitude equates, therefore can cancel out each other, at this moment, through after the output of the first quadrature bridge 5 close behind the road signal for high linearizing close the road after signal, reach the purpose of the original carrier signal of radio frequency domains being carried out high linearisation power amplification, the circulator 112 in described the first link can directly take back the upper of communication link such as repeater, in the down link.
Described pre-distortion unit 6 inside are to original carrier signal and the correct generation of closing the pre-distorted signals of dealing with relationship of signal behind the road, thereby directly affect the performance of device for generating pre-distorted signals of the present invention.
Please in conjunction with Fig. 1 and Fig. 2, Fig. 2 is the theory diagram that utilizes the pre-distortion unit 6 that method for generating pre-distorted signals realizes among Fig. 1, the direction that enters for the original carrier signal that is obtained by the first coupler 21 of the indicated direction of arrow RFc wherein, arrow RFc+i then represents the direction of closing signal input behind the road that the second coupler 22 obtains from the first quadrature bridge 5 (consulting Fig. 1).
Signal is also asynchronous in time after noting that original carrier signal herein and closing the road, if the first coupler 21 constantly obtains the original carrier signal and inputs pre-distortion unit 6 at T0, the second coupler 22 obtains close the road after signal then by the first link the original carrier signal is processed rear acquisition, life period consumes Tp, then herein close signal input behind the road time the moment be T1=T0+Tp, also namely, there are the time difference that is spaced apart Tp in T0 and T1.For signal after making the original carrier signal and closing the road is realized synchronously herein, thus can be first by the Tp processing of delaying time of 611 pairs of original carrier signals of a delayer, then, utilize original carrier signal after 612 pairs of time-delays of attenuator to carry out appropriateness adjustment on the intensity.
In like manner, described closing also utilizes attenuator 641 to carry out appropriate intensity adjustment after signal enters pre-distortion unit 6 behind the road.
The original carrier signal, enters the second quadrature bridge 652 and carries out shunt through after the above-mentioned processing in pre-distortion unit 6.After the first along separate routes original carrier signal and decay close the road after signal close the road through the 3rd quadrature bridge 653, close and pass by in the journey, described from the closing signal comprises behind the road carrier signal and differ 180 degree and equate and mutually offset in amplitude in phase place from the carrier signal of the second quadrature bridge 652 of the second coupler 22, only remaining intermodulation signal is exported through the 3rd quadrature bridge 653.
The signal of the 3rd quadrature bridge 653 outputs in succession carries out the intensity adjustment and after a delayer 682 carries out time fine tuning, exports the 4th quadrature bridge 654 to through an attenuator 681.Form the first whole accent device by described attenuator 681 and delayer 682.
The second quadrature bridge 652 isolated second original carrier signal along separate routes is then in succession after merit amplifier (employing class-a amplifier) 621 amplifies in advance, carry out the signal strength signal intensity adjustment through automatic control electric controlled attenuator 622, carry out exporting described the 4th quadrature bridge 654 to after the phase place fine setting through phase shifter 623 again.Wherein, automatic control electric controlled attenuator 622 adopts a wave detector 6220 to detect.Jointly form the second adjusting device by power amplifier 621, automatic control electric controlled attenuator 622, wave detector 6220 and phase shifter 623
Described the 4th quadrature bridge 654, will from second along separate routes the original carrier signal and close the road from the first along separate routes intermodulation signal, make both differ 180 degree in phase place, so just form described pre-distorted signals.
The of the present invention first, second, third and the 4th quadrature bridge all adopts 90 degree 3db electric bridges.
Pre-distortion unit of the present invention has following features:
1, utilizes the signal generation pre-distorted signals behind the road that closes of original carrier signal and feedback, namely comprised carrier signal in the pre-distorted signals and comprised again intermodulation signal (being distorted signal);
2, the ratio of intermodulation signal and carrier signal can be by adjusting the control end of automatic control electric controlled attenuator 622, voltage controlled phase shifter 623, according to output situation such as the linear index of power amplifier, offset situation etc. and carry out the self adaptation adjustment, to guarantee being issued to good performance at different extraneous circumstances;
3, have ALC function (ALC, the control of Automatic Level Control automatic electric-level), detect automatic control electric controlled attenuator 622 by 6220 pairs of carrier signals of wave detector and realize;
4, under the condition of the better performance of guaranteed output amplifier, gain constant.
Device for generating pre-distorted signals of the present invention has following features:
1, utilize the radio frequency amplification link of two-way full symmetric to amplify respectively carrier signal and contain carrier signal and the pre-distorted signals of intermodulation signal;
2, the generation of intermodulation signal comes from the first affiliated link of amplified signal, by forming the pre-distorted signals that has comprised intermodulation signal and carrier signal after the described pre-distortion unit;
3, generation is finished by the first quadrature bridge 5 the synthetic of slake carrier signal, in the building-up process of signal, the intermodulation signal that this intermodulation signal not only will comprise the amplified signal that produces in the first link produces predistortion, and secondary closes in the process on road after feedback, offseted the intermodulation signal that the amplified signal of the first link comprises, made the multi-carrier signal that amplifier can output linearity;
4, can utilize attenuator and the phase shifter of the power amplification device of two symmetries, to guaranteeing relevant performance index because the deterioration situation of the linear index that the factors such as the dynamic range of amplifier demand, temperature change cause is carried out the self adaptation adjustment;
5, the body series framework has AGC (automatic gain control) function, and in the situation of keeping optimum cancellation performance, it is constant that the gain of amplifier under any circumstance keeps.
Above-described embodiment is the better execution mode of the present invention; but embodiments of the present invention not merely are restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (4)
1. device for generating pre-distorted signals, acceptance is from the original carrier signal of the first coupler with from the input of closing signal behind the road of the second coupler, be used for producing pre-distorted signals in radio frequency domains, signal be is characterized in that comprising by the original carrier signal formation that has carried out power amplification and included intermodulation signal after this closed the road:
Delayer, the second quadrature bridge, the first adjusting device, the second adjusting device, the 3rd quadrature bridge and the 4th quadrature bridge,
Delayer, will from the original carrier signal of the first coupler delay time to keep with described from the second coupler close the road after signal synchronous in time;
The second quadrature bridge, the signal that delayer is exported carries out shunt output;
The 3rd quadrature bridge closes the output of the first via of the second quadrature bridge and the signal behind the road of closing from the second coupler to export intermodulation signal after the road offsets wherein carrier signal;
The first adjusting device will be adjusted from the intermodulation signal of the 3rd quadrature bridge;
The second adjusting device will be adjusted from the second tunnel output signal of the second quadrature bridge;
The 4th quadrature bridge closes the road to form described pre-distorted signals with the carrier signal of the first adjusting device and the intermodulation signal of the second adjusting device output;
Described the first adjusting device comprises attenuator, and the intermodulation signal from the 3rd quadrature bridge is carried out the intensity adjustment;
Described the first adjusting device also comprises phase shifter, and the intermodulation signal from this attenuator is carried out the intensity adjustment;
Described the second adjusting device comprises power amplifier, and the second tunnel signal of exporting from the second quadrature bridge is carried out power amplification;
Described the second adjusting device also comprises the automatic control electric controlled attenuator, and it utilizes a wave detector to detect the signal of the described power amplifier output of the second adjusting device, and the signal that power amplifier is exported automatically adjusts with correction signal intensity;
Described the second adjusting device also comprises phase shifter, and the signal that the automatic control electric controlled attenuator is exported carries out phase modulation.
2. device for generating pre-distorted signals according to claim 1, it is characterized in that: the phase shifter that described the second adjusting device adopts is voltage controlled phase shifter.
3. device for generating pre-distorted signals according to claim 1 is characterized in that: be prepended to described the 3rd quadrature bridge, also be provided with to from the second coupler close the road after signal carry out the attenuator that intensity is adjusted.
4. the described device for generating pre-distorted signals of any one in 3 according to claim 1 is characterized in that: described second, third and the 4th quadrature bridge all adopt 90 degree 3db electric bridges.
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| CN1390022A (en) * | 2001-06-01 | 2003-01-08 | 华为技术有限公司 | Linear power amplifying method and device |
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