CN1270544C - Adaptive tracking cancellation control method of feed forward type linear power amplifier and equipment - Google Patents
Adaptive tracking cancellation control method of feed forward type linear power amplifier and equipment Download PDFInfo
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Abstract
The present invention relates to an adaptive tracking cancellation control method of a feed forward type linear power amplifier, which at least comprises the steps that a pilot signal is inserted into a cancellation loop of an adaptive tracking cancellation control device of the feed forward type linear power amplifier, a pilot cancellation effect can be detected at real time when the signal does not exist, and an adaptive tracking process is carried out by referring to the pilot; when the signal is provided, the pilot cancellation effect can be detected at real time, and the adaptive tracking process is carried out by referring to an actual signal. Adaptive simulated closed ring detection and tracking control are respectively carried out to a main ring and an error ring. The present invention can overcome the respective defects of the existing fixed pilot reference technique and the existing actual signal reference technique, automatically switches over a fixed pilot reference method and an actual signal reference method according to the working state, and has adaptive detecting and control capability and high tracking speed to finally make a working signal and an intermodulation product have optimal cancellation effect. The present invention has the advantages of simple processing method and control structure, high detecting precision, high processing speed and high reliability.
Description
Technical field
The present invention relates to a kind of method and device that adopts feed-forward technique to realize linear power amplifier signal cancellation tracking Control, especially a kind of feed forward type linear power amplifier adaptive tracking cancellation control method and device with reference to pilot tone tracking and real work signal adaptive control technology.Belong to the mobile communication technology field.
Background technology
Because a large amount of digital modulation techniques that adopt, Modern Mobile Communications Systems requires to gather increase to the power amplifier linearity that is positioned at the sender end.In general, linear characteristic for the guaranteed output amplifier, adopt the linear power amplifier that the high power amplifier back-off realizes (to be generally called high power amplifier-HPA) fully, because power tube is fully operational in linearity range (being pure category-A), direct current conversion efficiency very low (generally can surpass 5%) not only, and working signal dynamic range very little (because generally will promptly 1% of peak power output using) from the 1dB compression point rollback of power tube 20dB at least.Therefore, be extensive use of various linearisation means (such as feed-forward technique, pre-distortion technology etc.) now and realize linear power amplifier, particularly in conjunction with LDMOS (metal-oxide semiconductor extending transversely) high power amplifiers that use in a large number at moving communicating field at present, make power tube be operated in AB class state, not only can improve system's direct current conversion efficiency (can reach 7%-15%), increase signal trend of work scope, and because the system power dissipation reduction, equipment dependability improves, and application is expanded.
Feed-forward technique is a kind of power amplifier linearization means that grow up nineteen seventies, because adopt this technology not only to realize performance index height (working band is wide, linearisation is effective), and technology maturation, the realization difficulty is less, the design risk is lower, so be used widely in various fields.
Feedforward linear power amplifier mainly adopts two signal cancellation loop---and main ring and error loop realize the linearisation purpose of power amplifier.Main ring uses the carrier frequency composition in the anti-phase counteracting elimination of the input sampled signal power amplifier output sampled signal, extracts non-linearity of power amplifier intermodulation distortion information, obtains error signal; Error loop then is adjusted to the error signal amplification level that equates with inter-modulated signal in the power amplifier output, and in system's output and the anti-phase counteracting of power amplifier output signal, eliminate the intermodulation component in the power amplifier output signal, obtain pure high-power RF signal.
The principle of signal cancellation is exactly that two amplitudes equate, the simulation addition of the signal of phase phasic difference 180 degree, and neutralization effect is directly determined by the amplitude and phase place (the departing from 180 degree) error of two paths of signals.In the main ring and error loop signal cancellation process of linear power amplifier, because the gain of main power amplifier and error amplifier and delay character can change with factors such as the supply power voltage of system, ambient temperature, power output, operating frequencies, the signal of participating in counteracting can't guarantee best neutralization effect with fixing amplitude and phase place attitude, therefore need two to have the circuit machine-processed follower amplifier respectively gain of adaptive ability and amplitude and the phase response that time-delay changes and control main ring and error loop, offset with the best that guarantees carrier frequency and inter-modulated signal.
The adaptive control technology that is used for feedforward linearized scheme at present mainly contains two classes:
The one, complete adaptive control technology with reference to the real work signal.System detects real work CF signal neutralization effect, and amplitude and the phase adjusted parts in the main ring are adjusted in control, offsets with the best that guarantees the working carrier frequency signal; Detect the intermodulation neutralization effect, adjust amplitude and phase adjusted parts in the error loop, offset with the best that guarantees inter-modulated signal.This scheme can retrieve in national patent 98107377.8, and its advantage is theoretical tracking effect the best (because system keeps track is to carry out with reference to the real work signal fully).But because Modern Mobile Communications Systems, CDMA mobile communication system particularly, real work radiofrequency signal excursion very wide (especially for overloading frequency operational environment), in addition, owing to adopt a lot of new technologies (such as variable bit rate and voice activation etc.) in the system, the scope of this variation and speed further increased.Therefore, to the tracking of real work signal, require detection and control system and amplitude and phase place adjustment component response speed and precision very high.So difficulty and complexity that this technology realizes are very high, develop very risky;
The 2nd, with reference to the adaptive control technology of pilot signal.Introduce pilot signal in signal cancellation loop, detect the pilot counteracting effect in real time, span of control limit of control and phase place adjustment component are to follow the amplitude-frequency characteristic that signal amplification circuit changes.The defective that though this technology has can't complete simulation real work signal (be actual signal offset always can't reach ideal effect), but because technology maturation, realize that difficulty is little, adopt some compensatory devices after, can reach the effect of approximate ideal, be widely adopted at present.
And pilot tone is with reference to dual mode is also arranged:
The one, the frequency sweep mode.Introduce the pilot signal that a fixed amplitude, frequency change in the interscan of system works frequency band from offsetting the loop input, offset amplitude and the phase adjusted component controls voltage that remains in pilot signal and the corresponding adjustment loop in the output synchronous detecting, with the neutralization effect that guarantees that pilot signal is best all the time.This method is found in U.S. Pat 5130663 " Feed forward amplifier network withfrequency swept pilot tone ".Because tracking Control dynamic scan in whole working band carries out and gets average,, can reach extraordinary effect so the self adaptation operation at utmost has been similar to the actual working state of signal amplification circuit.But because the difficulty that Sweep Source realizes is bigger, and how sweep velocity also be a great problem with tracking Control speed best fit, control implementation algorithm more complicated.This all is very disadvantageous to control hardware cost, reduction exploitation and production difficulty;
The 2nd, decide the frequency mode.The pilot signal of a fixed amplitude, frequency is introduced the counteracting loop, and detect the pilot signal neutralization effect in real time, control loop amplitude, phase place adjustment component make pilot counteracting the best.Though this method artificial actual signal working result is relatively poor,, still be widely used at present owing to realize the advantage simple, that production cost is low.
Summary of the invention
Main purpose of the present invention is adaptive tracking cancellation control method and the device that a kind of feed forward type linear power amplifier is provided at the deficiency of prior art, it can overcome existing fixedly pilot tone with reference to technology and actual signal with reference to technology shortcoming separately, based on fixing pilot tone with reference to technology and in conjunction with actual signal with reference to technology, realize that the feed forward type linear power amplifier intermodulation offsets control.
Another purpose of the present invention is to provide a kind of adaptive tracking cancellation control method and device of feed forward type linear power amplifier, it can be according to operating state automatically switch fixedly pilot tone reference pattern and actual signal reference pattern, have self-adapting detecting and control ability, tracking velocity is fast, the best results that working signal and intermodulation product are offset.
Another object of the present invention is to provide a kind of adaptive tracking cancellation control method and device of feed forward type linear power amplifier, its processing mode and control structure are simple, the accuracy of detection height, and processing speed is fast, the reliability height.
A further object of the present invention is to provide a kind of adaptive tracking cancellation control method and device of feed forward type linear power amplifier, and its versatility is stronger, realizes that easily cost is lower.
The invention provides following technical scheme for this reason and realize above-mentioned purpose:
Main thought of the present invention is: dominant pilot and error pilot tone are inserted major loop and the error loop that feed forward type linear power amplifier adaptive tracking cancellation control device is offset respectively.During no signal, major loop and error loop detect the pilot signal neutralization effect of dominant pilot and error pilot tone respectively in real time, and the adaptive tracing process is carried out with reference to pilot tone; When signal, the neutralization effect of major loop real time detection signal; Error loop detects error pilot signal neutralization effect in real time, and adaptive tracing process contrast signal carries out.
Particularly, comprise following step:
The first step, the structure vector modulator;
In second step, the structure pilot tone takes place and the introducing circuit;
The 3rd step, structure quadrature phase discriminator;
The 4th goes on foot, and sets up the closed loop detection and tracking control circuit of adaptive cancellation;
The 5th step, tuning adaptive cancellation tracking effect.
Described step 1 structure vector modulator further comprises following process:
At first, two identical quarter-phase modulators of performance of structure; Two PIN diode are synthetic by orthogonal loads, form a quarter-phase modulator, the performance that it has, and attenuation can change within the specific limits continuously, phase-shift phase but only differs two kinds of step states of 180 °;
Secondly, set up vector modulator and introduce signal cancellation loop; Two synthetic vector modulators of quarter-phase modulator orthogonal vector, it has that attenuation can change within the specific limits, phase-shift phase is can 0-360 ° continuous adjustable, and the adjustment of attenuation and phase-shift phase is chain rather than independently carries out, then with this vector modulator respectively as amplitude in two signal cancellation loop and phase place adjustment component, insert in the transmission channel of participating in the two-way offseting signal, realize the amplitude and the phase place external control adjustment function of main ring and error loop.
Described step 2 structure pilot tone takes place and introduces circuit further to comprise following process:
At first, set up two pilot tones (dominant pilot and error pilot tone) circuit takes place; The single-point radiofrequency signal that voltage controlled oscillator (VCO) produces is by output one tunnel pilot signal after the amplitude adjustment of electrically controlled attenuator, two fully independently pilot signal respectively as dominant pilot and error pilot tone;
Secondly, the structure pilot tone is introduced circuit; In two loop input channels, insert directional coupler, dominant pilot and error pilot tone can be coupled respectively and introduce in main ring and the error loop.
Described step 3 structure quadrature phase discriminator further can be summarized as: according to the quadrature phase-demodulating principle, set up orthogonal polarization, radio frequency mixing, intermediate frequency phase demodulation, low-pass filtering, the bias amplifier of one group of cascade, detect the amplitude and the phase error of two-way input radio frequency signal, generate the direct voltage of two quadratures.
The closed loop detection and tracking control circuit that described step 4 is set up adaptive cancellation further comprises following process:
At first, structure detects the sample circuit of radiofrequency signal; Insert directional coupler in the passage before and after signal cancellation point, sampling is participated in one road input signal of counteracting and is offset output signal;
Secondly, detect the amplitude and the phase error of sampled signal; Two sampled signals enter two inputs of quadrature phase detector respectively, detect the amplitude and the phase difference of signal before and after offsetting;
Then, generate vector modulator control voltage; Quadrature phase detector two-way current/voltage output, mutually orthogonal is the corresponding control pin of feed-in vector modulator respectively, forms the analog closed-loop detection and tracking control circuit that main ring and error loop self-adaptive are offset.
The tuning adaptive cancellation tracking effect of described step 5 further comprises following process:
At first, regulate quadrature phase detector output control voltage, make vector modulator work in the quadrant of amplitude, phase response and control voltage characteristic orthogonal balanced, reach the closed-loop adaptation tracking Control effect of signal cancellation;
Then, adjust pilot tone output frequency, amplitude, the best results that working carrier frequency signal and intermodulation product are offset.
Linear power amplifier device provided by the invention comprises five circuit modules: input module (32), main power amplifier module (33), carrier cancellation module (34), intermodulation cancellation module (35), adaptive tracing control module (36).
Described input module (32) further comprises: coupler 1 (321), power splitter 1 (322);
Described main power amplifier module (33) further comprises: coupler 2 (331), main power amplifier (332);
Described carrier cancellation module (34) further comprises: coupler 3 (341), delay line 2 (343), coupler 6 (344), vector modulator 1 (346), power splitter 2 (347);
Described intermodulation cancellation module (35) further comprises: delay line 1 (351), coupler 4 (352), coupler 5 (353), vector modulator 2 (354), error amplifier (355), coupler 7 (356);
Described adaptive tracing control module (36) comprises adaptive tracing controller (361);
Described input module (32) is responsible for feedthrough system input signal (31), and with dominant pilot (323) drawing-in system input channel, then system input signal (containing dominant pilot) is divided into two paths of signals---offset main signal (324) and drive main signal (325), give carrier cancellation module (34) and main power amplifier module (33) respectively; Main power amplifier module (33) is responsible for error pilot signal (334) is introduced in the driving main signal (325), and carries out power amplification, presents main power amplifier output signal (333) and gives carrier cancellation module (34); The carrier cancellation module is then with after main power amplifier output signal (333) sampling, eliminate wherein carrier wave composition (comprising dominant pilot) with counteracting main signal (324) through delay line 2 (343) time-delay and vector modulator 1 (346) amplitude, phase modulated, obtain error signal (348) and send into intermodulation cancellation module (35), go back the preceding partial offset main signal (324) of sampling vector modulation in addition and give adaptive tracing control module (36); Intermodulation cancellation module (35) is responsible for delivering to coupler 4 (352) after main power amplifier output signal (342) time-delay that carrier cancellation module (34) is straight-through, finish the counteracting of intermodulation component with error signal at this through amplitude, phase modulated and linear amplification, and give adaptive tracing controller (361) with offset result sampling, straight-through as system output signal (37) output, the error signal sampling after this module also will be amplified is in addition given adaptive tracing detector (361) as error sample signal (366); Adaptive tracing detector (361) is responsible for producing dominant pilot (323) and error pilot tone (334), and will take a sample and offset main signal (345) and error sample signal (366) and carry out the quadrature phase demodulation and obtain mutually orthogonal control voltage 362,363 and give vector modulator 1 (346), error sample signal (366) and intermodulation offset result sampled signal (367) are carried out the quadrature phase demodulation obtain mutually orthogonal control voltage 364,365 to vector modulator 2 (354), their amplitude of closed-loop control, phase modulated characteristic.
According to the technique scheme analysis as can be known, the present invention is based on fixedly pilot tone with reference to tracking technique, and in conjunction with quadrature phase demodulation and Vector Modulation means, realize the method for signal feedforward cancellation adaptive tracing control and a kind of linear power amplifier device of realizing based on the method, have following tangible advantage:
One, with low cost, technical difficulty is little.The present invention is based on fixedly pilot tone reference pattern, and owing to adopt the coherent detection means, extremely low to pilot carrier frequency and range stability requirement, prevailing VCO output can be satisfied system requirements.In addition, the quadrature phase demodulation that the present invention adopts adds Vector Modulation closed-loop adaptation control method, constitutes simply, and technology maturation without any need for special or special-purpose circuit or device, is very easy to realize.
Two, function admirable, the tracking accuracy height.The present invention chooses the pilot tone frequency and is positioned at outside the Linear Power Amplifier working band, can not take system frequency resource, causes the fixed frequency of native system to disturb.Simultaneously, because linear power amplifier is generally between base station sender and antenna diplexer, pilot amplitude and frequency rationally are set, on the basis that guarantees the tracking Control precision, rely on the outer inhibition ability of band of filter, the pilot power signals of exporting with the working signal one can not cause the outer interference of band.In addition, the present invention adopts accurate actual signal to realize signal trace with reference to scheme, because the pilot signal amplitude is than real work signal little a lot (general little 20-30dB), so when linear power amplifier does not have the input of working carrier frequency signal, the adaptive tracing control procedure is carried out with reference to pilot tone, and in case the input of working carrier frequency signal is arranged, adaptive tracking system will be that the basis skips to the actual signal reference pattern immediately with the pilot tone tracking results, amplitude and phase information with actual signal are foundation, the real-time tracking system state variation, the adjustment loop parameter.Therefore, system keeps track result not only speed is fast, and tracking effect is good.Certain this technology is to realize on the basis that does not increase system cost and circuit complexity.
Three, the technology versatility is fine.One of key technology of the present invention is exactly quadrature phase demodulation and Vector Modulation technology.General counteracting output pilot detection method is that narrow-band filtering adds the detection sampling, promptly utilizes narrow band filter to leach from offset output signal and offsets the residue pilot signal, obtains remaining pilot frequency information with the detection sample circuit then.The present invention adopts the relevant phase demodulation of quadrature to add low-pass filtering is directly extracted the two paths of signals of participating in counteracting from offset output signal amplitude and phase error information, and not only circuit is simple but also accuracy of detection is high; General amplitude and phase control mode are that amplitude adjustment and phase place adjustment are controlled respectively as two individual components, control procedure not only complexity but also speed slow, realize that circuit is loaded down with trivial details.The present invention adopts the vector modulator of a kind of amplitude and the chain adjustment of phase place to realize amplitude and phase place adjustment together, and not only circuit is simple but also control is sensitive.These two kinds of technology are used in combination, the counteracting that can directly realize analog form detects and control, without any need for the digital processing process, signal processing mode is simple, speed is fast, reliability is high, with low cost, and do not use any dedicated devices, be applicable to the radio-frequency power amplifier linearisation mechanism of any modulation system communication system.
Description of drawings
Fig. 1 is a method flow diagram of the present invention;
Fig. 2 is existing feed forward type linear power amplifier structure drawing of device;
Fig. 3 is a feed forward type linear power amplifier structure drawing of device of the present invention;
Fig. 4 is the principle assumption diagram that adaptive tracing detects controller among Fig. 3 of the present invention;
Fig. 5 is the principle assumption diagram of vector modulator among Fig. 3 of the present invention;
Fig. 6 is the performance diagram of quarter-phase modulator among Fig. 5 of the present invention;
Fig. 7 is the performance diagram of vector modulator among Fig. 3 of the present invention;
Fig. 8 is the principle assumption diagram of quadrature phase detector among Fig. 4 of the present invention;
Fig. 9, the 10th, the present invention detect the attenuation and control voltage characteristic curve of control system;
Figure 11, the 12nd, the present invention detect the phase-shift phase and control voltage characteristic curve of control system.
Embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is a method flow diagram of the present invention, has specifically reflected the performing step of feedforward linear power amplifier adaptive cancellation tracking and controlling method provided by the invention, further can be described below:
The first step, the structure vector modulator; Vector modulator is amplitude and the phase place adjustment component that a kind of attenuation and phase-shift phase can be subjected to the chain variation of external control circuit, attenuation can change within the specific limits continuously, phase-shift phase can be implemented in the 0-360 degree and adjust continuously, not only simple in structure, and control highly sensitive, needing simultaneously to be highly suitable for the controlling mechanism (such as Dynamic Signal counteracting loop) of amplitude and phase place adjustment, so the present invention selects the specific implementation parts of this circuit as the signal cancellation adaptive control;
In second step, the structure pilot tone takes place and the introducing circuit; Because the present invention adopts relevant phase demodulation technology to carry out input, and pilot tone is only as the auxiliary reference tracking signal (during no working carrier frequency signal, the loop tracks reference pilot signal, there is the working carrier frequency signal then to jump to the actual signal tracking mode immediately), therefore amplitude and the phase stability to pilot signal requires very low, common VCO output to satisfy;
The 3rd step, structure quadrature phase discriminator; Amplitude and phase place adjustment component that the present invention adopts---vector modulator needs one group of mutually orthogonal control voltage to control its performance change, the output of quadrature phase discriminator just in time has this characteristic, therefore general all with these two kinds of circuit pairing uses, and the quadrature phase discriminator has the advantage of discriminator sensitivity height, inhibition mirror image noise, so the present invention adopts the quadrature phase discriminator to detect the amplitude and the phase error of participating in offseting signal;
The 4th goes on foot, and sets up the closed loop detection and tracking control circuit of adaptive cancellation; The present invention uses and offsets residual signal and offset front signal (wherein a tunnel) and carry out the quadrature phase demodulation, and be equipped with auxiliary circuit identified result is converted into vector modulator control voltage, control the decay and the phase-shift phase of vector modulator, thereby reach the tracking effect of closed-loop adaptation;
The 5th step, tuning adaptive cancellation tracking effect; Key of the present invention will find the amplitude and the phase equilibrium point of Detection ﹠ Controling closed circuit exactly, and make two balance points and and be one, so possess enough tuning links in the design circuit.
Fig. 2 is existing feed forward type linear power amplifier structure drawing of device.The input radio frequency signal is by behind power splitter (1) five equilibrium, one the tunnel amplifies output for main power amplifier (2), one the tunnel sends into main power amplifier output signal with road device (9) and sampling coupler (3) sampling after carrying out amplitude and phase place adjustment through delay line 2 (6) time-delay and by electrically controlled attenuator 1 (7) and voltage controlled phase shifter 1 (8) eliminates main power amplifier and exports input radio frequency signal component in the sampled signal, only stays owing to the intermodulation distortion of the non-linear generation of main power amplifier (2) is exported as error signal; After the amplitude and phase place adjustment and error amplifier (12) linear amplification of error signal by electrically controlled attenuator 2 (10) and voltage controlled phase shifter 2 (11), enter the main channel by directional coupler (5), with the intermodulation product of offsetting through the straight-through main power amplifier output signal of the sampling coupler (3) of delay line 1 (4) time-delay in the main power amplifier output signal of elimination, be met the high Linear Great Power signal output of system requirements.
The front is mentioned, so-called signal cancellation is exactly that the two-way amplitude equates, the simulation addition of 180 ° of signals of phase phasic difference, electrically controlled attenuator 1 (7) and voltage controlled phase shifter 1 (8) are exactly to locate to participate in the amplitude of two paths of signals of counteracting and phase error (utilizing the automatically controlled amplitude of electrically controlled attenuator 7 to adjust the automatically controlled position adjusting function mutually of function and voltage controlled phase shifter 8) for the external control compensation with road device (9), and same electrically controlled attenuator 2 (10) and voltage controlled phase shifter 2 (11) are used to compensate the two paths of signals amplitude and the phase error of locating to participate in counteracting at directional coupler (5).Because the system works CF signal is in the certain frequency scope, occur with the variation attitude in amplitude is dynamic, and the amplitude-phase response of main power amplifier (2) and error amplifier (12) changes (promptly having AM-AM (amplitude modulation-amplitude modulation) and AM-PM (amplitude modulation-phase modulation) modulating characteristic) with operating frequency and amplitude non-linearity, the amplitude and the phase characteristic of main simultaneously power amplifier (2) and error amplifier (12) also can be subjected to operating voltage, the influence of factor such as ambient temperature and device aging changes, so the control voltage of electrically controlled attenuator 1 (7) and voltage controlled phase shifter 1 (8) and electrically controlled attenuator 2 (10) and voltage controlled phase shifter 2 (11) can not be fixed level, and answer real-time change, to adapt to main power amplifier (2), the amplitude of error amplifier (12) and phase characteristic still keep the basic needs of optimum signal neutralization effect when changing.
By last surface analysis, can reach a conclusion: feed forward type linear power amplifier will be implemented in linearisation index best in certain working band, the dynamic range of signals, and the technology of most critical is the adaptive control means of real-time tracking signal amplification circuit amplitude and phase change characteristic.Therefore need on Fig. 1 scheme basis, add detection and control circuit again with adaptive tracing ability.
Fig. 3 is a feed forward type linear power amplifier structure drawing of device of the present invention.Input radio frequency signal (31) at first enters input module (32), in input module (32), to detect dominant pilot (323) the introducing input channel of control module (36) from adaptive tracing by coupler 1 (312), and be divided into counteracting main signal (324) and drive main signal (325) incoming carrier cancellation module (34) and main power amplifier module (33) respectively by power splitter 1 (322); In main power amplifier module (33), the error pilot tone of being introduced by coupler 2 (331) (334) that detects control module (36) from adaptive tracing enters main power amplifier (332) and carries out power amplification with driving main signal (325), obtains powerful, as to comprise working carrier frequency signal and the non-linear intermodulation distortion signals of main power amplifier main power amplifier output signal (333) to carrier cancellation module (34); In carrier cancellation module (34), the through connect signal (342) of coupler 3 (341) is exported to intermodulation cancellation module (35), pass to power splitter 2 (347) under the sampled signal, with 2 (343) time-delays of process delay line, coupler 6 (344) is straight-through, the counteracting main signal (324) that vector modulator 1 (346) amplitude and phase place are adjusted is carried out signal cancellation, eliminate the carrier frequency composition in the main power amplifier output sampled signal, obtaining the representative of main power amplifier non-linear distortion products---error signal (348) is given intermodulation cancellation module (35), and the sampling of coupler 6 time-delay is simultaneously offset main signal (345) and detected control module (36) to adaptive tracing; After error signal (345) enters the intermodulation cancellation module, by vector modulator 2 modulation, error amplifier (355) linear amplification and coupler 7 (356) are straight-through, be coupled into the main channel by coupler 4 (352), main power amplifier output signal (342) the high-power signal that through delay line 1 (351) time-delay arrive straight-through with carrier cancellation module (34) eliminates non-linear distortion products, obtain linearizing high-power RF signal, and through coupler 5 (353) samplings, sampled signal (367) is given adaptive tracing controller (361), and through connect signal is exported as system output signal (37); Adaptive tracing control module (36) only comprises an adaptive tracing controller (361), dominant pilot (323) and error pilot tone (334) that its generation main ring and error loop need, and detection main ring and error loop signal cancellation effect, vector modulator in the control loop, reach the tracking Control target of adaptive cancellation, its principle constitutes sees Fig. 4 and explanation.
Fig. 4 is that the principle of the adaptive tracing controller in the apparatus structure shown in Figure 3 constitutes.It comprises that main ring detects control module (41) and error loop detects control module (42) two parts circuit, wherein each part include a quadrature phase detector (main ring 411, error loop 412) and pilot tone generation circuit (voltage controlled oscillator 2 (423) that the voltage controlled oscillator 1 (413) of main ring adds electrically controlled attenuator 3 (412), error loop adds electrically controlled attenuator 4 (422)).The working mechanism of this part circuit is: main ring detects control module (41) and amplifies output sampled signal (366) amplitude, phase difference by quadrature phase detector 1 (411) detection sampling counteracting main signal (345) and error, monitor carrier signal neutralization effect (monitor signal when the working carrier frequency signal is arranged in real time, monitoring dominant pilot during no signal), produce the control voltage 362,363 of vector modulator 1 (346) and send into corresponding control pin, thereby, reach the self adaptation effect of closed-loop control main ring signal cancellation; Error loop detects control module (42) is offset the output sampled signal by quadrature phase detector 2 (421) detection errors amplification output sampled signals (366) and intermodulation amplitude, phase difference, the neutralization effect of monitoring intermodulation in real time (monitoring intermodulation product when signal is arranged, monitoring error pilot tone during no signal), produce the control voltage 364,365 of vector modulator 2 (354) and send into corresponding control pin, thereby, reach the self adaptation effect that the intermodulation of closed-loop control error loop is offset.
Fig. 5 is that the principle of vector modulator in the device shown in Figure 3 constitutes.Vector modulator is that it comprises 3dB electric bridge (52) and road device (55), quarter-phase modulator 1 (53) and quarter-phase modulator 2 (54) by synthetic adjustable continuously, the phase-shift phase 0-360 ° chain tuning part of variable amplitude-phase of a kind of attenuation that obtains of two quarter-phase modulator quadratures.The quarter-phase modulator is to have impedance under the forward dc voltage control with two to be taken place to the short circuit attitude by the open circuit attitude that the synthetic a kind of attenuation of the PIN diode orthogonal loads of pure resistive variation characteristic is adjustable continuously, phase place has only antipodal two states (being defined as 0 ° of attitude and 180 ° of attitudes) electrically controlled attenuator, and its control characteristic as shown in Figure 6.Correspondingly, two quarter-phase modulator quadratures are synthetic obtains vector modulator characteristic shown in Figure 7.
Fig. 6 is the performance diagram of quarter-phase modulator.Along with the increase of control voltage, the ascending descending again variation of its attenuation, phase characteristic but has only the saltus step from a kind of stationary state (0 ° of attitude) to another kind of antipodal stationary state (180 ° of attitudes).
Fig. 7 is the performance diagram that the present invention adopts vector modulator.The signal attenuation vector of two quadratures (90 ° of phase phasic differences) simulation addition reaches that a kind of attenuation A is adjustable within the specific limits, phase-shift phase θ continually varying Vector Modulation effect between 0-360 °.
Fig. 8 is the principle pie graph that adaptive tracing shown in Figure 4 detects the quadrature phase detector that adopts in the controller.Owing to be difficult to directly realize the phase demodulation computing than higher rf frequency scope, need earlier it to be reduced to lower frequency, finish the phase demodulation operation again, this principle that just is being based on phase discriminator of the present invention realizes, certainly the present invention has realized a quadrature phase discriminator also in conjunction with the quadrature synthetic technology.It comprises three circuit modules: quadrature frequency mixing module (81), phase demodulation module (82) and local oscillator module (83).In the quadrature frequency mixing module, one tunnel signal (345 or 366) of participating in phase demodulation through 3dB electric bridge (811) be divided into that the two-way amplitude equates, the signal of 90 ° of phase phasic differences, sneak into intermediate frequency local oscillator (818) deviation frequency and participate in phase discrimination signal (366 or 367) mixing with process frequency mixer 3 (815) respectively, obtain two mutually orthogonal intermediate-freuqncy signals 813,817 by another road of power splitter (814) homophase five equilibrium; In the phase demodulation module, 813 and 817 pass through intermediate frequency amplifier 1 (821) and intermediate frequency amplifier 2 (826) amplifications respectively, input phase discriminator 1 (822) and phase discriminator 2 (827), simultaneously with intermediate frequency local oscillator (818) phase demodulation, phase demodulation output is exported direct-current control voltage 362,363 or 364,365 by the centre cap of potentiometer 824 and 829 again with after an adjustable dc voltage (825) addition respectively by low pass filter 1 (823) and the non-flip-flop of low pass filter 2 (828) filterings; In addition, the local oscillator module is made up of intermediate-frequency oscillator (831) and low pass filter 3 (832), for quadrature mixing and phase demodulation process provide the intermediate carrier signal---intermediate frequency local oscillator (818), promptly when the quadrature mixing, give one the tunnel to participate in mixed frequency signal adding intermediate-frequency deviation, make the mixing results intermediate-freuqncy signal carry out amplitude and phase error information that two-way is participated in mixed frequency signal, and in follow-up phase demodulation process, obtain representing the amplitude of participating in mixed frequency signal and the direct voltage of phase error information with same intermediate frequency local oscillator (818) signal phase demodulation.
Fig. 9 and Figure 10 are two kinds of amplitudes control poised states that adaptive tracing control procedure that the present invention proposes finally should reach.Control voltage and vector modulator amplitude response (being attenuation) are when characteristic is just in time opposite, control will reach balance, and certain this balance has two states, as Fig. 9 and 10, and actual can only select a kind of, one of this task that tuning work will be finished among the present invention just.
Figure 11 and Figure 12 are two kinds of phase control poised states that adaptive tracing control procedure that the present invention proposes finally should reach.Control voltage and vector modulator phase response (being phase-shift phase) are when characteristic is just in time opposite, control will reach balance, and certain this balance has two states, as Figure 11 and 12, and actual can only select a kind of, this another task that tuning work will be finished among the present invention just.
Vector modulator has nothing in common with each other in the control characteristic of each quadrant (total I, II, III and four quadrants of IV) as can be seen from Figure 5.Suppose to cause the attenuation of vector attenuator 1 (346) or vector attenuator 2 (354) improper because the amplitude performance of main power amplifier (332) or error amplifier (355) (and gain) changes, corresponding meeting causes offsetting output and changes, promptly 366 or 367 mould value changes (but phase angle is constant), must find a vector modulator attenuation variation characteristic and the quadrant of controlling change in voltage characteristic just in time opposite (as Fig. 8 and shown in Figure 9).B among the figure and B ' are the balance point of closed loop locking.Equally, suppose because the phase-shift characterisitc of main power amplifier (332) or error amplifier (355) changes, cause vector attenuator 1 (346) or vector attenuator 2 (354) phase-shift phases improper, corresponding meeting causes offsetting output and changes, promptly 366 or 367 mould value and phase angle change must find a vector modulator phase-shift phase variation characteristic and the quadrant of controlling change in voltage characteristic just in time opposite (as shown in Figure 10 and Figure 11).P among the figure and P ' are the balance point of closed loop locking.In the real work, main power amplifier (332) or error amplifier (355) amplitude and phase characteristic may change at any time, how to find and make B or B ' and P or P ' to be positioned at same quadrant and and and be one to be exactly to the invention provides the key point that method is achieved.Considered abundant debugging method in the circuit design of the present invention, can this key technology of realization of debugging by following debugging:
The first step is regulated amplitude balance point B or B ' that 825 point voltages find main ring and error loop;
In second step, regulate phase equilibrium point P or P ' that 414 and 424 point voltages find main ring and error loop;
The 3rd step, regulate and 414 and 424 point voltages at 825, make amplitude and phase equilibrium point be positioned at same quadrant;
The 4th step, regulate 824 and 829, amplitude balance point and phase equilibrium point are overlapped.
In addition, because the present invention adopts the pilot signal frequency to be positioned at outside the system works frequency band, counteracting can not be the pilot tone optimum, therefore should add the work signal at system works band center point during system debug, and make the power output maximum, regulate 824 and 829 then, observation system output simultaneously, offsetting the best with actual signal and intermodulation is target.
Above embodiment is only unrestricted in order to explanation the present invention, although the present invention is had been described in detail with reference to above preferred embodiment, those of ordinary skill in the art is to be understood that, can make amendment, be out of shape the present invention or be equal to replacement, and not breaking away from the spirit and scope of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (20)
1, a kind of adaptive tracking cancellation control method of feed forward type linear power amplifier, it is characterized in that: which comprises at least: the adaptive tracking cancellation control device that pilot signal is inserted a feed forward type linear power amplifier is offset loop, during no signal, detect the pilot counteracting effect in real time, the adaptive tracing process is carried out with reference to pilot tone; When signal, the neutralization effect of real time detection signal, adaptive tracing process contrast signal carries out.
2, the adaptive tracking cancellation control method of feed forward type linear power amplifier as claimed in claim 1, it is characterized in that: the pilot signal of insertion is divided into dominant pilot and error pilot tone, primary pilot signal is inserted the input port of the adaptive tracking cancellation control device of described feed forward type linear power amplifier, and the error pilot tone is to insert the input of the adaptive tracking cancellation control device master power amplifier module of described feed forward type linear power amplifier.
3, the adaptive tracking cancellation control method of feed forward type linear power amplifier as claimed in claim 2 is characterized in that: pilot signal is with coupling drawing-in system radio-frequency channel after the adjustment of single-point radiofrequency signal process amplitude.
4, as the adaptive tracking cancellation control method of claim 2 or 3 described feed forward type linear power amplifiers, it is characterized in that: detect the main ring that the pilot counteracting effect is included in the adaptive tracking cancellation control device of described feed forward type linear power amplifier in real time and detect the dominant pilot neutralization effect in real time, detect error pilot counteracting effect in real time in the error loop of the adaptive tracking cancellation control device of described feed forward type linear power amplifier.
5, the adaptive tracking cancellation control method of feed forward type linear power amplifier as claimed in claim 1, it is characterized in that: the neutralization effect of real time detection signal is the main ring real-time detection practical signal cancellation effect at the adaptive tracking cancellation control device of described feed forward type linear power amplifier, detects error pilot counteracting effect in real time in the error loop of the adaptive tracking cancellation control device of described feed forward type linear power amplifier.
6, the adaptive tracking cancellation control method of feed forward type linear power amplifier as claimed in claim 1 is characterized in that: main ring and error loop are carried out adaptive modeling closed loop detection and tracking control respectively.
7, the adaptive tracking cancellation control method of feed forward type linear power amplifier as claimed in claim 6 is characterized in that: the adaptive modeling closed loop detects to participating in one road input signal of offsetting and offsetting output signal sampling and give an adaptive controller.
8, the adaptive tracking cancellation control method of feed forward type linear power amplifier as claimed in claim 6 is characterized in that: adaptive modeling closed loop tracking Control makes working signal and intermodulation product neutralization effect the best for regulating pilot tone output.
9, the adaptive tracking cancellation control method of feed forward type linear power amplifier as claimed in claim 8 is characterized in that: the adjusting pilot tone is output as regulates dominant pilot and error pilot tone respectively.
10, the adaptive tracking cancellation control method of feed forward type linear power amplifier as claimed in claim 7, it is characterized in that: the adaptive modeling closed loop detects and comprises that the tributary voltage that adopts quadrature phase demodulation technology to produce two quadratures respectively to the amplitude-phase adjuster of main ring and error loop, directly extracts amplitude and the phase error information of participating in the two paths of signals of offsetting from offset output signal.
11, the adaptive tracking cancellation control method of feed forward type linear power amplifier as claimed in claim 10 is characterized in that: the quadrature phase demodulation further comprises low-pass filtering and to the adjustment of direct current biasing and amplitude.
12, the adaptive tracking cancellation control method of feed forward type linear power amplifier as claimed in claim 6 is characterized in that: adaptive modeling closed loop tracking Control adopts vector modulation method to realize the chain adjustment of amplitude and phase place, offsets control.
13, as the adaptive tracking cancellation control method of claim 10 or 11 described feed forward type linear power amplifiers, it is characterized in that: the input signal of vector modulation is the output signal of quadrature phase demodulation, directly realizes offsetting at analog form and detects and control.
14, a kind of adaptive tracking cancellation control device of feed forward type linear power amplifier, which comprises at least an input module that contains first power splitter, by first delay line, the main power amplifier module of the first amplitude-phase adjusting module constitutes main ring, and by second delay line, the error loop of the formation of the second amplitude-phase adjusting module, in the middle of main ring and the error loop is first coupling module, the carrier cancellation module that second power splitter constitutes, the signal output part that second coupler constitutes, it is characterized in that: the sampling output signal of described main ring and error loop signal connects adaptive tracing and detects controller, adaptive tracing detects controller output pilot signal and gives input module, the input of main power amplifier module, adaptive tracing detects the neutralization effect that controller is used to detect pilot tone and signal.
15, the adaptive tracking cancellation control device of feed forward type linear power amplifier as claimed in claim 14, it is characterized in that: described adaptive tracing detects controller output control signal and gives first and second amplitude-phase adjusting module, in order to the neutralization effect of control signal.
16, the adaptive tracking cancellation control device of feed forward type linear power amplifier as claimed in claim 14, it is characterized in that: described adaptive tracing detects controller and comprises that main ring detects control module and error loop detects control module, constitute by first, second quadrature phase detector and electrically controlled attenuator, voltage controlled oscillator respectively, be used to produce primary pilot signal and error pilot signal, detect neutralization effect.
17, the adaptive tracking cancellation control device of feed forward type linear power amplifier as claimed in claim 16 is characterized in that: described quadrature phase detector comprises that quadrature frequency mixing module, local oscillator module and input connect the phase demodulation module of quadrature frequency mixing module output.
18, the adaptive tracking cancellation control device of feed forward type linear power amplifier as claimed in claim 17 is characterized in that: described quadrature frequency mixing module is by connecting 3dB electric bridge, two middle frequency mixers, power splitters with preface and exporting frequency mixers and form; Wherein, middle frequency mixer output connects the input of phase demodulation module, and the output of 3dB electric bridge connects the sampled signal of main ring and error loop, and the input of output frequency mixer connects the output sampled signal.
19, the adaptive tracking cancellation control device of feed forward type linear power amplifier as claimed in claim 17, it is characterized in that: described phase demodulation module is by connecting two-way intermediate frequency amplifier as input, phase discriminator and constituting as the low pass filter of output with preface, output connects the first or second amplitude-phase adjusting module.
20, as the adaptive tracking cancellation control device of claim 14 or 15 or 16 described feed forward type linear power amplifiers, it is characterized in that: the described first or second amplitude-phase adjusting module comprise the 3dB electric bridge that connects with preface, two quarter-phase modulators and and the road device, its quarter-phase modulator is that attenuation is adjustable continuously, phase place is opposite fully, and phase place is in the chain adjusting of the variable amplitude-phase of 0-360 degree.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011316705A CN1270544C (en) | 2001-12-31 | 2001-12-31 | Adaptive tracking cancellation control method of feed forward type linear power amplifier and equipment |
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| CNB011316705A CN1270544C (en) | 2001-12-31 | 2001-12-31 | Adaptive tracking cancellation control method of feed forward type linear power amplifier and equipment |
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| CN1430425A CN1430425A (en) | 2003-07-16 |
| CN1270544C true CN1270544C (en) | 2006-08-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1700690B (en) * | 2004-05-18 | 2010-04-21 | 华为技术有限公司 | Feedforward linear power amplifier counteracting and regulating method and apparatus |
| CN103138685B (en) * | 2011-11-28 | 2015-06-10 | 中国科学院上海微***与信息技术研究所 | Orthogonal frequency division multiplexing (OFDM) self-adaption feedforward linear power amplifying device |
| CN103199808B (en) * | 2013-02-07 | 2016-05-04 | 武汉凡谷电子技术股份有限公司 | A kind of intermodulation canceller for passive device |
| CN103219948B (en) * | 2013-03-14 | 2015-12-16 | 武汉正维电子技术有限公司 | There is the high efficiency power amplifier of error signal compensation function |
| CN104573772B (en) * | 2015-02-02 | 2019-03-01 | 周立明 | Radio frequency identification positioning and tracing equipment and mode |
| CN105227146A (en) * | 2015-10-20 | 2016-01-06 | 中国人民解放军空军工程大学 | A kind of feed forward power amplifier |
| CN109302198B (en) * | 2017-07-24 | 2020-04-10 | 深圳市中兴微电子技术有限公司 | Wireless transceiver system and mixer circuit thereof |
| CN107453783B (en) * | 2017-09-11 | 2020-11-06 | 湖北工业大学 | Adaptive co-location interference suppression system and method capable of reducing trapped wave bandwidth |
| CN107579716B (en) * | 2017-09-19 | 2020-08-07 | 中国人民解放军海军工程大学 | Linear power amplifier based on analog cancellation |
| CN110823140B (en) * | 2019-11-11 | 2021-04-30 | 华滋奔腾（苏州）安监仪器有限公司 | Demodulator and demodulation method based on frequency mixer and power detector strain sensor |
| CN114448471B (en) * | 2021-12-22 | 2023-02-28 | 海鹰企业集团有限责任公司 | Underwater energy and signal transmission system based on self-adaptive feedforward signal anti-interference |
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