CN104218896B - Pilot tone is generated and compensation device and Feed Forward Power Amplifier system - Google Patents
Pilot tone is generated and compensation device and Feed Forward Power Amplifier system Download PDFInfo
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- CN104218896B CN104218896B CN201410472964.6A CN201410472964A CN104218896B CN 104218896 B CN104218896 B CN 104218896B CN 201410472964 A CN201410472964 A CN 201410472964A CN 104218896 B CN104218896 B CN 104218896B
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Abstract
The invention provides a kind of generation of pilot tone and compensation device and Feed Forward Power Amplifier system.Wherein, pilot tone generation and compensation device include：Processor, the first pilot tone generative circuit, the second pilot tone generative circuit, the first pilot tone cancellation circuit, the second pilot tone cancellation circuit.The pilot tone generation and compensation device that the present invention is provided have used two pilot signals, Mobile state adjustment can be entered to the frequency and amplitude of the first pilot signal and the second pilot signal according to the convergence state of the first voltage and second voltage of the first pilot signal and the second pilot signal in the output signal of Feed Forward Power Amplifier system, frequency and amplitude in system bandwidth of operation is set to be consistent with the frequency and amplitude of pilot signal, it is ensured that error offsets completely in Feed Forward Power Amplifier system.
Description
Technical field
The present invention relates to mobile communication technology field, more particularly to a kind of pilot tone is generated and compensation device and Feed Forward Power Amplifier
System.
Background technology
With the development of the global radio communication technology, wireless user increases rapidly, and adjoint is more calls and data
The increase of transmission quantity, at the same time, the importance of frequency spectrum resource is highlighted all the more.In order to farthest utilize frequency spectrum resource, adopt
With new modulation system and multicarrier linear technology.The appearance of these technologies and use cause signal peak-to-average force ratio increasingly
Height, the linearisation index request to power amplification system is also more and more stricter.And feed-forward technique has, and bandwidth of operation is wider, stability
Good, linear advantage high, is increasingly becoming a kind of linearization technique widely used in power amplification system.
In order to whether error in judgement signal is completely counterbalanced by, Feed Forward Power Amplifier system would generally use pilot tone system, insert in a link
Enter the pilot tone that a frequency is fixed, by the power of detection output pilot tone, if the power of output end pilot tone is changed to most by height
It is low, then it is assumed that pilot tone has been offseted.Due to the situation that offsets that situation reflects error power that offsets of pilot tone, so, by inspection
Whether the power for surveying pilot tone has been offseted with regard to energy error in judgement signal.
In conventional feed forward power amplifier system, the pilot point of insertion is fixed frequency, is carried out when error signal is offset with pilot tone
Cancellation level as systematic error signal cancellation degree foundation.So require the frequency and amplitude and whole system of pilot signal
Frequency and amplitude in bandwidth of operation are that completely the same can be only achieved best offsets effect.It is broadband during due to system application
, bandwidth is wider, and the frequency and amplitude in system bandwidth of operation are more difficult to ensure with the frequency of pilot signal and the uniformity of amplitude,
Effect is offseted so as to influence error signal in Feed Forward Power Amplifier system.
The content of the invention
In order to solve the frequency and the uniformity of amplitude of frequency and amplitude in said system bandwidth of operation and pilot signal
The technical problem being difficult to ensure that, the present invention provides a kind of pilot tone generation and compensation device and Feed Forward Power Amplifier system.
A kind of pilot tone generation and compensation device, including：Processor, the first pilot tone generative circuit, the second pilot tone generative circuit,
First pilot tone cancellation circuit, the second pilot tone cancellation circuit；
The input of the first amplitude modulation and phase modulation circuit in processor connection Feed Forward Power Amplifier first loop of system, and pass through
First pilot tone generative circuit connection Feed Forward Power Amplifier the first loop of system in the first amplitude modulation and phase modulation circuit output end, by second
Pilot tone generative circuit connects the output end of Feed Forward Power Amplifier the first amplifying circuit of system；
The input of the second amplitude modulation and phase modulation circuit in processor connection Feed Forward Power Amplifier second loop of system, and respectively
The output end of the 4th termination power of Feed Forward Power Amplifier system is connected by the first pilot tone cancellation circuit and the second pilot tone cancellation circuit；
The processor is used to control the first pilot tone generative circuit and the second pilot tone generative circuit to export the first pilot tone respectively
Signal and the second pilot signal, and be respectively loaded in main carrier signal；And by the first pilot tone cancellation circuit and second
Pilot tone cancellation circuit detects the of first pilot signal and the second pilot signal from the output signal of feedforward power amplification system
One voltage and second voltage, convergence state according to first voltage and second voltage obtain optimal the first pilot settings value and the
Two pilot settings values.The main carrier signal is that the input signal of Feed Forward Power Amplifier system is coupled into two-way letter through the power amplification system that feedovers
After number, wherein all the way signal through feedover power amplification system the first amplitude modulation and phase modulation circuit the processor control under amplitude modulation and phase modulation and
Into.
Above-mentioned pilot tone generation and compensation device have used two pilot signals, can be according to the output signal of Feed Forward Power Amplifier system
In the first pilot signal and the second pilot signal first voltage and second voltage convergence state to the first pilot signal and
The frequency and amplitude of two pilot signals enter Mobile state adjustment, make the frequency of the frequency and amplitude and pilot signal in system bandwidth of operation
Rate and amplitude can be consistent, it is ensured that error is offseted completely in Feed Forward Power Amplifier system, is improve and is offseted effect.
The present invention also provides a kind of Feed Forward Power Amplifier system, including above-mentioned pilot tone is generated and compensation device.
Above-mentioned Feed Forward Power Amplifier system, is generated and compensation device by above-mentioned pilot tone, solves pilot tone in traditional power amplification system
The problem that signal is difficult to ensure that with the uniformity of Feed Forward Power Amplifier system working signal, makes the error of Feed Forward Power Amplifier system offset effect
More preferably.
Brief description of the drawings
Fig. 1 is the pilot tone generation of one embodiment and compensation device structural representation；
Fig. 2 is the first pilot tone generative circuit structural representation of one embodiment；
Fig. 3 is the second pilot tone generative circuit structural representation of one embodiment；
Fig. 4 is the first pilot tone cancellation circuit structural representation of one embodiment；
Fig. 5 is the second pilot tone cancellation circuit structural representation of one embodiment；
Fig. 6 is first pilot signal of one embodiment and the arranges value adjustment flow chart of the second pilot signal；
Iterative algorithm flow chart in the step of Fig. 7 is one embodiment s3；
Fig. 8 is the Feed Forward Power Amplifier system structure diagram of one embodiment；
Fig. 9 offsets detection electrical block diagram for first loop of one embodiment.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with accompanying drawing
Step ground is described in detail.
With reference to shown in Fig. 1, pilot tone generations and compensation device structural representation of the Fig. 1 for one embodiment, the present embodiment
Pilot tone is generated and compensation device, including processor 600, the first pilot tone generative circuit 400, the second pilot tone generative circuit 500, first
Pilot tone cancellation circuit 700, the second pilot tone cancellation circuit 800；
The input of the first amplitude modulation and phase modulation circuit 301 in connection Feed Forward Power Amplifier the first loop of system of processor 600, and lead to
The output end of the first amplitude modulation and phase modulation circuit 301 crossed in connection Feed Forward Power Amplifier the first loop of system of the first pilot tone generative circuit 400,
The output end of the first amplifying circuit of Feed Forward Power Amplifier system 104 is connected by the second pilot tone generative circuit 500；
The input of the second amplitude modulation and phase modulation circuit 302 in connection Feed Forward Power Amplifier the second loop of system of processor 600, and point
Not Tong Guo the first pilot tone cancellation circuit 700 and the second pilot tone cancellation circuit 800 connect the 4th termination power of Feed Forward Power Amplifier system
205 output end；
Processor 600 is used to control the first pilot tone generative circuit 400 and the second pilot tone generative circuit 500 to export first respectively
Pilot signal and the second pilot signal, and the first pilot signal is loaded onto the first amplitude modulation and phase modulation circuit of Feed Forward Power Amplifier system
In the main carrier signal of 301 outputs, the second pilot signal is loaded onto in the main carrier signal that the first amplifying circuit 104 is exported；
And detected from the output signal of feedforward power amplification system by the first pilot tone cancellation circuit 700 and the second pilot tone cancellation circuit 800
The first voltage and second voltage of first pilot signal and the second pilot signal, according to first voltage and the receipts of second voltage
Hold back state and obtain optimal the first pilot settings value and the second pilot settings value.
The structure of the other parts of Feed Forward Power Amplifier system related to the present invention is also show with reference to shown in Fig. 1, in Fig. 1,
As shown in figure 1, input signal is divided into two paths of signals, signal is offseted for the main carrier of the loop of Feed Forward Power Amplifier system first all the way,
Another road signal is used for loading the first pilot signal and the second pilot signal successively as the main carrier signal of Feed Forward Power Amplifier system,
The output signal of Feed Forward Power Amplifier system, the output of Feed Forward Power Amplifier system are treated as by the amplification of Feed Forward Power Amplifier system, coupling etc.
Fraction signal into the first pilot tone cancellation circuit 700 and the second pilot tone cancellation circuit 800 is separated in signal.
Above-mentioned pilot tone generation and compensation device have used two pilot signals, can be according to the output signal of Feed Forward Power Amplifier system
In the first pilot signal and the second pilot signal first voltage and second voltage convergence state to the first pilot signal and
The frequency and amplitude of two pilot signals enter Mobile state adjustment, make the frequency of the frequency and amplitude and pilot signal in system bandwidth of operation
Rate and amplitude can be consistent, it is ensured that error offsets completely in Feed Forward Power Amplifier system.
In one embodiment, with reference to shown in Fig. 2, Fig. 2 shows for the structure of the first pilot tone generative circuit of one embodiment
It is intended to, the first pilot tone generative circuit can include the first frequency maker 410, the first filtration module 420, first that are sequentially connected
Attenuation control circuit 430, the amplifying circuit 450 of first switch circuit 440 and second；
The first frequency maker 410 is used to produce the first initial pilot signal under the control of processor 600；
First filtration module 420 is used to be filtered the first initial pilot signal；
First attenuation control circuit 430 is used to believe filtered first initial pilot under the control of processor 600
Number carry out power attenuation；
The first switch circuit 440 is used to control closure according to processor 600 or disconnects the first pilot signal channels；
The first initial pilot signal after second amplifying circuit 450 is used for decay carries out power amplification and obtains first
Pilot signal.
The first pilot tone generative circuit of above-described embodiment can obtain the first pilot signal under the control of processor 600, and
And the arranges value of above-mentioned first pilot signal can by processor 600 control adjust automatically, it is ensured that the first pilot signal offset with
The uniformity that Feed Forward Power Amplifier systematic error is offseted.
In one embodiment, with reference to shown in Fig. 3, Fig. 3 shows for the structure of the second pilot tone generative circuit of one embodiment
It is intended to, the second pilot tone generative circuit can include the second frequency maker 510, the second filtration module 520, second that are sequentially connected
Attenuation control circuit 530, the amplifying circuit 550 of second switch circuit 540 and the 3rd；
The second frequency maker 510 is used to produce the second initial pilot signal under the control of processor 600；
Second filtration module 520 is used to be filtered the second initial pilot signal；
Second attenuation control circuit 530 is used to believe filtered second initial pilot under the control of processor 600
Number carry out power attenuation；
The second switch circuit 540 is used to control closure according to processor or disconnects the second pilot signal channels；
The second initial pilot signal after 3rd amplifying circuit 550 is used for decay carries out power amplification and obtains second
Pilot signal.
The second pilot tone generative circuit of above-described embodiment can obtain setting for the second pilot signal under the control of processor 600
Value is put, and the arranges value of above-mentioned second pilot signal can be controlled adjust automatically by processor 600, it is ensured that the second pilot signal
Offset the uniformity offseted with Feed Forward Power Amplifier systematic error.
In one embodiment, with reference to shown in Fig. 4, Fig. 4 is the schematic diagram of the first pilot tone cancellation circuit of one embodiment,
First pilot tone cancellation circuit can include the first decay π nets 711, the first frequency mixer 720, the 3rd filtration module that are sequentially connected
730th, the first detection tube 740 and the 4th filtration module 750；And second for being connected with first frequency mixer 720 successively declines
Subtract π nets 712, the 5th filtration module 760 and the 3rd frequency generator 770；
The first decay π nets 711 and the second decay π nets 712 are π type attenuation networks, are respectively used to Feed Forward Power Amplifier system
The 4th coupled signal and the 3rd frequency generator 770 output signal power attenuation；
First frequency mixer 720 is used to be mixed the output signal of the first decay π nets 711 and the second decay π nets 712
Frequency exports the first intermediate-freuqncy signal of fixed frequency；
First detection tube 740 is used to carry out detection to filtered first intermediate-freuqncy signal of the 3rd filtration module 730；
3rd frequency generator 770 is used to be produced under the control of processor 600 has default difference with the first pilot signal
First local frequency of value.
The first pilot tone cancellation circuit of above-described embodiment is mixed into steady by the output signal to Feed Forward Power Amplifier system
Qualitative more preferable first intermediate-freuqncy signal, and after the 3rd filtration module 730 is filtered except making an uproar, with the first detection tube 740
To the first intermediate-freuqncy signal of Noise does not carry out detection after filtering, first leads in the output signal of the Feed Forward Power Amplifier system for detecting
Being obtained by processor 600 for the first voltage of frequency signal, is used to control the generation of the first pilot tone after judging its convergence state
The relative parameters setting of the first pilot signal of circuit.
In one embodiment, with reference to shown in Fig. 5, Fig. 5 is the schematic diagram of the second pilot tone cancellation circuit of one embodiment,
The 3rd decay π nets 811 that second pilot tone cancellation circuit includes being sequentially connected, the second frequency mixer 820, the 6th filtration module 830, the
Two detection tubes 840 and the 7th filtration module 850；And the 4th decay π nets being connected with second frequency mixer 820 successively
812nd, the 8th filtration module 860 and the 4th frequency generator 870；
The 3rd decay π nets 811 and the 4th decay π nets 812 are π type attenuation networks, are respectively used to Feed Forward Power Amplifier system
The 4th coupled signal and the 4th frequency generator 870 output signal power attenuation；
Second frequency mixer 820 is used to be mixed the output signal of the 3rd decay π nets 811 and the 4th decay π nets 812
Frequency exports the second intermediate-freuqncy signal of fixed frequency；
Second detection tube 840 is used to carry out detection to filtered second intermediate-freuqncy signal of the 6th filtration module 830；
4th frequency generator 870 is used to be produced under the control of processor 600 has default difference with the second pilot signal
Second local frequency of value.
The second pilot tone cancellation circuit of above-described embodiment is mixed into steady by the output signal to Feed Forward Power Amplifier system
Qualitative more preferable second intermediate-freuqncy signal, and after the 6th filtration module 830 is filtered except making an uproar, with the second detection tube 840
To the second intermediate-freuqncy signal of Noise does not carry out detection after filtering, second leads in the output signal of the Feed Forward Power Amplifier system for detecting
Being obtained by processor 600 for the second voltage of frequency signal, is used to control the generation of the second pilot tone after judging its convergence state
The relative parameters setting of the second pilot signal of circuit.
Further, above-mentioned 3rd filtration module 730 can include the first low pass filter 731, first being sequentially connected
Bandpass filter 732, the 4th amplifying circuit 733 and the second bandpass filter 734；Above-mentioned 6th filtration module 830 can be wrapped
Include the second low pass filter 831, the 3rd bandpass filter 832, the 5th amplifying circuit 833 and the filter of the 4th band logical being sequentially connected
Ripple device 834.The first intermediate-freuqncy signal and second for respectively exporting the first frequency mixer 720 and the second frequency mixer 820 in the embodiment
Intermediate-freuqncy signal carries out bandpass filtering again after carrying out LPF, bandpass filtering, power amplification successively respectively, makes above-mentioned intermediate-freuqncy signal
To greatest extent except while making an uproar, also ensure that first intermediate-freuqncy signal and the second intermediate-freuqncy signal respectively enters the first detection tube
740 and second detection tube 840 power.
In one embodiment, with reference to shown in Fig. 6, processor 600 detects first pilot signal and the second pilot tone letter
Number first voltage and second voltage, convergence state according to first voltage and second voltage obtains the first optimal pilot settings
The process of value and the second pilot settings value, specifically may include steps of：
The initial value of s1, the first pilot signal of setting and the second pilot signal, and they are inserted into Feed Forward Power Amplifier respectively
In first loop of system；
S2, the first pilot signal of detection and the second pilot signal are in the first pilot tone cancellation circuit and the second pilot tone cancellation circuit
In detecting circuit, judge whether the first pilot signal and the first voltage and second voltage of the second pilot signal restrain, if so,
Turn to remove s4, otherwise perform s3；
S3, frequency, amplitude that the first pilot signal and the second pilot signal are set gradually using iterative algorithm, judge first
Whether the first voltage and second voltage of pilot signal and the second pilot signal restrain, if it is not, continue iteration adjustment, if so, protecting
The optimal setting value after convergence is deposited, s4 is performed；
S4, the first voltage in the first pilot tone cancellation circuit is added with the second voltage in the second pilot tone cancellation circuit,
And determine whether whether the voltage after being added restrains, if it is not, s2 is returned, if so, each arranges value is set into current optimal setting
Value.
In one embodiment, the span of the initial value of first pilot signal and the second pilot signal can be
The outer 5MHz-10MHz of band at main carrier signal working frequency two ends in the loop of Feed Forward Power Amplifier system first, wherein, a pilot tone letter
Number initial value can be arranged on the low-frequency range of working frequency range, the initial value of another pilot signal can be arranged on work frequently
The high band of section.
Because offseting for error signal is to offset situation as foundation using pilot signal in Feed Forward Power Amplifier system.In pilot tone
When the phase flatness and larger amplitude flatness difference of signal and error signal, it is possible to pilot signal occur completely right
Disappeared the situation that still error signal is not offseted, and such case can show more obvious at broadband.
Above-described embodiment after two pilot signals using can effectively solve the above problems.Under the control of a processor generation with
The consistent pilot signal of Feed Forward Power Amplifier system working frequency range bandwidth, makes offseting in state and Feed Forward Power Amplifier system by mistake for pilot signal
The state that offsets of difference signal is consistent.Due to having used two pilot signals, in the height of Feed Forward Power Amplifier system working frequency range
Frequency range two ends have been all inserted into pilot signal, pilot tone generation proposed by the present invention and compensation device is obtained very close with working band
The main carrier signal for offseting effect, influenceing in working frequency range again, overcome bandwidth of operation it is higher when height frequency range offset
The inconsistent problem of effect, enables the system to obtain and more excellent offsets effect.
With reference to shown in Fig. 7, for the iterative algorithm in above-mentioned steps s3, as a kind of implementation method, can specifically include
Following steps：
S301, adjusts the set of frequency value of the first pilot signal, while keep other values constant, the first big stepping to set
(such as 1MHz) carries out upper and lower iteration, finally carries out upper and lower iteration with the small stepping (such as 200kHz) for setting；
S302, judges whether first voltage value restrains, if do not restrained, returns to s301, if convergence, turns s303；
S303, adjusts the amplitude arranges value of the first pilot signal, and its residual value temporarily keeps constant, first the big stepping to set
(such as 5dB) carries out upper and lower iteration, finally carries out upper and lower iteration with the small stepping (such as 0.1dB) for setting；
S304, judges whether first voltage value restrains, if do not restrained, returns to s301, if convergence, turns s305；
S305, adjusts the set of frequency value of the second pilot tone, and its residual value temporarily keeps constant, first the big stepping (example to set
Such as 1MHz) upper and lower iteration is carried out, upper and lower iteration is finally carried out with the small stepping (such as 200kHz) for setting；
S306, judges whether second voltage value restrains, if do not restrained, returns to s301, if convergence, turns s307；
S307, adjusts the amplitude arranges value of the second pilot tone, and its residual value temporarily keeps constant, first the big stepping (example to set
Such as 5dB) upper and lower iteration is carried out, upper and lower iteration is finally carried out with the small stepping (such as 0.1dB) for setting；
S308, judges whether second voltage value restrains, if do not restrained, returns to s301, if convergence, turns s309；
S309, preserves the optimal setting value after convergence, and first voltage is added with second voltage；
S310, judges whether the voltage after being added restrains, if do not restrained, s301 is returned to, if convergence, turns s311；
S311, preserves each arranges value.
In one embodiment, the processor can be using DSP (digital signal processor, numeral letter
Number treatment) chip realize.
The present invention also provides a kind of Feed Forward Power Amplifier system, including above-mentioned pilot tone is generated and compensation device.Led by above-mentioned
Frequency generation and compensation device, pilot signal is difficult with the uniformity of Feed Forward Power Amplifier system working signal in solving traditional power amplification system
With the problem for ensureing, making the error of Feed Forward Power Amplifier system, to offset effect more preferable.
Fig. 8 shows the Feed Forward Power Amplifier system structure diagram of present invention offer in one embodiment, it is illustrated that in, input letter
Number it is divided into two paths of signals in the first termination power 201：Main carrier signal A2 and signal A1.Signal A1 is used to offset the first ring
The main carrier on road.
First pilot signal is loaded onto the main carrier after the first amplitude modulation and phase modulation circuit 301 carries out amplitude modulation and phase modulation treatment
Signal A2, by after the amplification of the first amplifying circuit 104, to loading the second pilot signal in the signal after amplification.It is loaded with first
The main carrier signal A2 of pilot signal and the second pilot signal is by entering the 7th amplifying circuit after the treatment of Feed Forward Power Amplifier system
105 are amplified the main power amplifier output signal B of output, and the non-linear of the 7th amplifying circuit 105 makes main power amplifier output signal B produce mistake
Very.The main power amplifier output signal B of distortion couples signal B1 of the part containing distortion component by the second termination power 202, passes through
5th decay π nets 315 decay to equal with the power of signal A1, and signal B1 is combined with signal A1 in 3dB electric bridges 314, carries
Take out error signal D.
Signal A1 and signal B1 are respectively undistorted input signal and the signal containing distortion component, and they are by same load
Ripple is produced, if signal A1 is equal to the time delay that main carrier signal A2 enters 3dB electric bridges 314 by the time delay of paster delay line 312,
And the amplitude of the signal B1 containing distortion component and the amplitude phase of signal A1 are caused by the adjustment of the first amplitude modulation and phase modulation circuit 301
Deng 180 ° of phase difference, then, just main carrier signal is offseted can completely in 3dB 314 combinings of electric bridge, 3dB electric bridges 314
Output signal be the error signal D for comprising only distortion component.
Error signal D enters the 3rd termination power 203, divides from the coupled signal D of output the 3rd of the 3rd termination power 203
Go out a part of signal D1, signal D1 is input into the first loop and offsets in detection circuit and offsets situation for judge main carrier.3rd
Coupled signal D is by forming the error signal of amplification after the treatment of the second amplitude modulation and phase modulation circuit 302 and the 9th amplifying circuit 108
E.Because error signal D peak-to-average force ratios are high, in order to prevent producing distortion component again, the 9th amplifying circuit 108 need to use enough
Back-off is undistorted after amplifying to ensure the 3rd coupled signal D, it is ensured that it is carried out in the linear amplification region of error power amplifier
Amplify.Error signal E is missed with by the second coupled signal B of filtering wave by prolonging time device filtering 310 in the 4th termination power 205
Difference signal is offseted.Here the condition for making error signal offset completely is that the second coupled signal B enters by filtering wave by prolonging time device 310
The time delay that the time delay of four termination powers 205 and the 3rd coupled signal D enter the 4th termination power 205 is equal, and needs by the
The adjustment under the control of processor 600 of two amplitude modulation and phase modulation circuits 302 causes the error signal E and the of the output of the 8th amplifying circuit 107
The amplitude of two coupled signal B is equal, opposite in phase.Now, the output signal of the output of the 4th termination power 205 is used as Feed Forward Power Amplifier
The output signal of system is that the High Linear of input signal amplifies signal.
Above-mentioned Feed Forward Power Amplifier system can also offset detection circuit including the first loop, and with reference to Fig. 9, Fig. 9 shows one
First loop of the above-mentioned Feed Forward Power Amplifier system of embodiment offsets the structural representation of detection circuit.First loop offsets inspection
Slowdown monitoring circuit can include the 9th filtration module 910 and the 3rd detection tube 920 that are sequentially connected；9th filtration module 910 is used
A part of signal D1 separated in the 3rd coupled signal D exported to the 3rd termination power of above-mentioned Feed Forward Power Amplifier system 203 enters
Row filtering；3rd detection tube 920 is used to carry out detection to the filtered signal D1 of the 9th filtration module 910, detects
The voltage of signal D1 is used for the voltage according to signal D1 convergence state after being obtained by processor 600 judges the first loop main carrier
Offset state.
Used as one embodiment, above-mentioned 9th filtration module 910 can include the 3rd low pass filter being sequentially connected
911st, the 6th amplifying circuit 912, the 5th bandpass filter 913 and the 6th bandpass filter 914.
The 9th filtration module 910 makes the 3rd coupling by repeatedly filtering and amplification during above-mentioned first loop offsets detection circuit
A part of signal D1 is separated in signal D the signal power for entering the 3rd detection tube 920, this pair are ensure that while noise is filtered
The detection circuit that disappears is restrained situation by the control of processor 600 by the voltage of the detection signal D1 of the 3rd detection tube 920, for judging master
Whether carrier wave offsets completely, extracts the error signal without main carrier component, and the error signal extracted is used for Feed Forward Power Amplifier system
The error of second loop of uniting is offseted.
Embodiment described above only expresses several embodiments of the invention, and its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention can not be interpreted as.It should be pointed out that for one of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to guarantor of the invention
Shield scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
1. a kind of pilot tone is generated and compensation device, it is characterised in that including：Processor, the first pilot tone generative circuit, the second pilot tone
Generative circuit, the first pilot tone cancellation circuit, the second pilot tone cancellation circuit；
The input of the first amplitude modulation and phase modulation circuit in processor connection Feed Forward Power Amplifier first loop of system, and by first
Pilot tone generative circuit connection Feed Forward Power Amplifier the first loop of system in the first amplitude modulation and phase modulation circuit output end, by the second pilot tone
Generative circuit connects the output end of Feed Forward Power Amplifier the first amplifying circuit of system；
The input of the second amplitude modulation and phase modulation circuit in processor connection Feed Forward Power Amplifier second loop of system, and pass through respectively
The output end of the 4th termination power of the first pilot tone cancellation circuit and the second pilot tone cancellation circuit connection Feed Forward Power Amplifier system；
The processor is used to control the first pilot tone generative circuit and the second pilot tone generative circuit to export the first pilot signal respectively
With the second pilot signal, and it is respectively loaded in main carrier signal；And by the first pilot tone cancellation circuit and the second pilot tone
Cancellation circuit detects the first electricity of first pilot signal and the second pilot signal from the output signal of feedforward power amplification system
Pressure and second voltage, the convergence state according to first voltage and second voltage obtain optimal the first pilot settings value and second and lead
Frequency arranges value.
2. pilot tone according to claim 1 generation and compensation device, it is characterised in that the first pilot tone generative circuit include according to
The first frequency maker of secondary connection, the first filtration module, the first attenuation control circuit, first switch circuit and second are amplified
Circuit；
The first frequency maker is used to produce the first initial pilot signal under processor control；
First filtration module is used to be filtered the first initial pilot signal；
First attenuation control circuit is used to carry out power to filtered first initial pilot signal under processor control
Decay；
The first switch circuit is used to control closure according to processor or disconnects the first pilot signal channels；
Second amplifying circuit be used for decay after the first initial pilot signal carry out power amplification obtain the first pilot tone letter
Number；
And/or
Second pilot tone generative circuit includes the second frequency maker, the second filtration module, the second adjustable attenuation electricity that are sequentially connected
Road, second switch circuit and the 3rd amplifying circuit；
The second frequency maker is used to produce the second initial pilot signal under processor control；
Second filtration module is used to be filtered the second initial pilot signal；
Second attenuation control circuit is used to carry out power to filtered second initial pilot signal under processor control
Decay；
The second switch circuit is used to control closure according to processor or disconnects the second pilot signal channels；
3rd amplifying circuit be used for decay after the second initial pilot signal carry out power amplification obtain the second pilot tone letter
Number.
3. pilot tone according to claim 1 is generated and compensation device, it is characterised in that the first pilot tone cancellation circuit bag
Include the first decay π nets, the first frequency mixer, the 3rd filtration module, the first detection tube and the 4th filtration module being sequentially connected；
And the second decay π nets, the 5th filtration module and the 3rd frequency generator being connected with first frequency mixer successively；
The first decay π nets and the second decay π nets are π type attenuation networks, are respectively used to the 4th coupling of Feed Forward Power Amplifier system
The power attenuation of the output signal of signal and the 3rd frequency generator；
First frequency mixer is used to for the output signal of the first decay π nets and the second decay π nets to carry out the fixed frequency of mixing output
First intermediate-freuqncy signal of rate；
First detection tube is used to carry out detection to filtered first intermediate-freuqncy signal of the 3rd filtration module；
3rd frequency generator is used to produce under processor control the first for having preset difference value with the first pilot signal
Vibration frequency；
And/or
Second pilot tone cancellation circuit includes the 3rd decay π nets, the second frequency mixer, the 6th filtration module, the second inspection that are sequentially connected
Wave duct and the 7th filtration module；And the 4th decay π nets, the 8th filtration module being connected with second frequency mixer successively
And the 4th frequency generator；
The 3rd decay π nets and the 4th decay π nets are π type attenuation networks, are respectively used to the 4th coupling of Feed Forward Power Amplifier system
The power attenuation of the output signal of signal and the 4th frequency generator；
Second frequency mixer is used to for the output signal of the 3rd decay π nets and the 4th decay π nets to carry out the fixed frequency of mixing output
Second intermediate-freuqncy signal of rate；
Second detection tube is used to carry out detection to filtered second intermediate-freuqncy signal of the 6th filtration module；
4th frequency generator is used to produce under processor control have preset difference value with the second pilot signal second
Vibration frequency.
4. pilot tone according to claim 3 generation and compensation device, it is characterised in that the 3rd filtration module include according to
First low pass filter of secondary connection, the first bandpass filter, the 4th amplifying circuit and the second bandpass filter；Described 6th
Filtration module includes the second low pass filter, the 3rd bandpass filter, the 5th amplifying circuit and the 4th band logical that are sequentially connected
Wave filter.
5. pilot tone according to claim 1 is generated and compensation device, it is characterised in that the processor is further used for：
The initial value of s1, the first pilot signal of setting and the second pilot signal, and they are inserted Feed Forward Power Amplifier system respectively
The first loop in；
S2, the first pilot signal of detection and the second pilot signal are in the first pilot tone cancellation circuit and the second pilot tone cancellation circuit
Detecting circuit, judges whether the first pilot signal and the first voltage and second voltage of the second pilot signal restrain, if so, turning to go
S4, otherwise performs s3；
S3, frequency, amplitude that the first pilot signal and the second pilot signal are set gradually using iterative algorithm, judge the first pilot tone
Whether the first voltage and second voltage of signal and the second pilot signal restrain, if it is not, continue iteration adjustment, if so, preserve receiving
Optimal setting value after holding back, performs s4；
S4, the first voltage in the first pilot tone cancellation circuit is added with the second voltage in the second pilot tone cancellation circuit, gone forward side by side
One step judges whether the voltage after being added restrains, if it is not, s2 is returned, if so, each arranges value is set into current optimal setting value.
6. pilot tone according to claim 5 is generated and compensation device, it is characterised in that first pilot signal and second
The span of the initial value of pilot signal is the band at main carrier signal working frequency two ends in the loop of Feed Forward Power Amplifier system first
Outer 5MHz-10MHz.
7. pilot tone according to claim 1 is generated and compensation device, it is characterised in that the processor uses dsp chip
Realize.
8. a kind of Feed Forward Power Amplifier system, it is characterised in that including the pilot tone generation described in any one of claim 1 to 7 and offset
Device.
9. Feed Forward Power Amplifier system according to claim 8, also offsets detection circuit including the first loop, it is characterised in that
First loop offsets detection circuit includes the 9th filtration module and the 3rd detection tube that are sequentially connected；The 9th filtering mould
Block is used to be filtered the 3rd coupled signal of the termination power of Feed Forward Power Amplifier system the 3rd output；3rd detection tube is used for
Detection is carried out to filtered 3rd coupled signal of the 9th filtration module.
10. Feed Forward Power Amplifier system according to claim 9, it is characterised in that the 9th filtration module includes connecting successively
The 3rd low pass filter, the 6th amplifying circuit, the 5th bandpass filter and the 6th bandpass filter for connecing.
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| CN201410472964.6A CN104218896B (en) | 2014-09-16 | 2014-09-16 | Pilot tone is generated and compensation device and Feed Forward Power Amplifier system |
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| CN201410472964.6A CN104218896B (en) | 2014-09-16 | 2014-09-16 | Pilot tone is generated and compensation device and Feed Forward Power Amplifier system |
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| CN104218896B true CN104218896B (en) | 2017-07-07 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6404823B1 (en) * | 1998-07-01 | 2002-06-11 | Conexant Systems, Inc. | Envelope feedforward technique with power control for efficient linear RF power amplification |
| CN201174685Y (en) * | 2007-11-13 | 2008-12-31 | 福建三元达通讯股份有限公司 | Pilot signal adaptive detection apparatus for feed forward power amplifier with amplitude periodically jumping |
| CN103684306A (en) * | 2013-12-31 | 2014-03-26 | 京信通信系统（中国）有限公司 | Radio frequency feed-forward amplifier and loop self-adaptive control method |
-
2014
- 2014-09-16 CN CN201410472964.6A patent/CN104218896B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6404823B1 (en) * | 1998-07-01 | 2002-06-11 | Conexant Systems, Inc. | Envelope feedforward technique with power control for efficient linear RF power amplification |
| CN201174685Y (en) * | 2007-11-13 | 2008-12-31 | 福建三元达通讯股份有限公司 | Pilot signal adaptive detection apparatus for feed forward power amplifier with amplitude periodically jumping |
| CN103684306A (en) * | 2013-12-31 | 2014-03-26 | 京信通信系统（中国）有限公司 | Radio frequency feed-forward amplifier and loop self-adaptive control method |
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|---|---|
| CN104218896A (en) | 2014-12-17 |
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