CN103441735B - Balance amplification system and antenna system - Google Patents
Balance amplification system and antenna system Download PDFInfo
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- CN103441735B CN103441735B CN201310213595.4A CN201310213595A CN103441735B CN 103441735 B CN103441735 B CN 103441735B CN 201310213595 A CN201310213595 A CN 201310213595A CN 103441735 B CN103441735 B CN 103441735B
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Abstract
The present invention provides a kind of balance amplification system and antenna system.This amplification system includes linear process unit, amplification channel and feedback channel；Amplification channel includes same frequency combiner and N road amplifier.Described feedback channel includes signal synthesizer and N bar feedback branch；The outfan of jth road amplifier is connected with the input of j-th strip feedback branch, and the outfan of every feedback branch is respectively connecting to the input of signal synthesizer, and the outfan of signal synthesizer is connected to linear process unit；Wherein, j is more than or equal to 1 and less than or equal to each natural number between N；N bar feedback branch is at least provided with phase compensating circuit in a feedback branch, phase compensating circuit carries out reverse compensation for the interference signal that the outfan from described system enters into the feedback branch at place, and the output signal of the amplifier that feedback branch connects is carried out positive compensation；The interference signal of every feedback branch output is cancelled out each other.
Description
Technical field
The present embodiments relate to electronic technology, particularly relate to a kind of balance amplification system and antenna system.
Background technology
Four-path balance amplification system framework as shown in Figure 1, at input, enters same frequency combiner 11, same frequency combiner 11 will export after input signal branch to two amplifiers 12 after the linear processing unit processes of input signal；At outfan, generally carried out closing road to the outfan of two-way amplifier with frequency combiner 11 by one.It addition, the feedback channel of outfan includes the control module for controlling linear processing unit, linear process unit is controlled by control module by the output signal of system.Can be 3dB electric bridge with frequency combiner, the usually 3dB electric bridge of 90 degree.Balance amplifier has the advantage that the concordance of power amplifier is good；The standing wave closing road port is good；Power amplifier stability is high；Balance amplifier is closed road by multiple passages, and the power of each passage is less, and therefore balance amplifier can use low-power device to realize；Balance amplifier can use harmonic tuning technology to promote power amplification efficiency；The plurality of advantages such as bandwidth performance is good.
Outer signals in order to avoid entering from outfan affects the performance of linear processing unit in feedback channel, as shown in Figure 1, existing balance amplification system, is provided with a circulator 13 or isolator between outfan and feedback channel, to isolate the outer signals interference to feedback channel.Due to circulator or the increase of isolator so that the cost of balance amplification system improves.
Summary of the invention
The embodiment of the present invention provides one balance amplification system and antenna system, for reducing the cost of balance amplification system, eliminates the outer signals interference to processing unit linear in amplification system simultaneously.
First aspect, the embodiment of the present invention provides one balance amplification system, including: linear process unit, amplification channel and feedback channel；Described amplification channel includes combiner and N road amplifier；The input of No. i-th amplifier and the input of i+1 road amplifier are respectively connected to the outfan of same combiner, the outfan of No. i-th amplifier and the outfan of i+1 road amplifier and close road by a combiner；N is even number, and i is all odd numbers less than N；The input signal of described system enters described amplification channel after described linear process cell processing, it is characterised in that:
Described feedback channel includes signal synthesizer and N bar feedback branch；Described feedback channel is for coupling the output signal of described system and processing coupled signal, and the signal after processing is input to described linear process unit；Described linear process unit, for the input signal of system being contrasted with the output signal of system, makes described system become linearized system；
The outfan of jth road amplifier is connected with the input of j-th strip feedback branch, and the outfan of every feedback branch is respectively connecting to the input of described signal synthesizer, and the outfan of described signal synthesizer is connected to described linear process unit；Wherein, j is more than or equal to 1 and less than or equal to each natural number between N；
Described N bar feedback branch is at least provided with phase compensating circuit in a feedback branch, described phase compensating circuit carries out reverse compensation for the interference signal that the outfan from described system enters into the feedback branch at place, and the output signal of the amplifier that described feedback branch connects is carried out positive compensation；
Under the common effect of described phase compensating circuit and described signal synthesis circuit, the interference signal of every feedback branch output is cancelled out each other.
In conjunction with first aspect, in the first mode in the cards, enter into the interference signal of described signal synthesis circuit through i-th feedback branch, and enter into the interference signal of described signal synthesis circuit through i+1 bar feedback branch, cancel out each other after described signal synthesizer processes.
In conjunction with first aspect, or, the first of first aspect mode in the cards, in the implementation that the second is possible, if the phase place of each combiner is 90 degree in described amplification channel, phase compensating circuit in described i-th feedback branch and the phase difference value of the phase compensating circuit in described i+1 bar feedback branch are equal with the phase place of the combiner for No. i-th amplifier carries out conjunction road with i+1 road amplifier.
In conjunction with first aspect, or, the first of first aspect and the second mode in the cards, in the implementation that the third is possible, if N is 2, the phase place of the phase compensating circuit of the 2nd article of feedback branch is equal with the phase place of the combiner that the outfan of No. 2nd amplifier connects.
In conjunction with first aspect, or, the first of first aspect is to the third mode in the cards, in the 4th kind of possible implementation, if N is 4, article 2, the phase place of the phase compensating circuit of feedback branch is equal with the phase place of the combiner A that the outfan of No. 2nd amplifier connects, article 3, the phase place of the phase compensating circuit in feedback branch is equal with the phase place of the combiner B that the outfan of No. 3rd amplifier connects, article 4, the phase place of the phase compensating circuit in feedback branch is, the phase place of the combiner B that the outfan of No. 4th amplifier connects and the phase place sum of combiner C, described combiner C is for carrying out closing road to the output signal of combiner A and combiner B.
In conjunction with first aspect, or, the first of first aspect is to the 4th kind of mode in the cards, in the 5th kind of possible implementation, between the input of the combiner connected at the outfan of the outfan of jth road amplifier and described jth amplifier, it is provided with the wave filter disturbing signal except useful signal in addition in the output signal for filtering every road amplifier.
Between outfan that the coupling port of j-th strip feedback branch is arranged on jth road amplifier by the embodiment of the present invention and the input of combiner being connected with jth road amplifier, in order to make the output signal being input to the Signals & Systems outfan of control module 24 keep consistent, the embodiment of the present invention arranges phase compensating circuit at least one feedback branch.The outfan of every feedback branch is connected to signal synthesizer 24, in feedback branch under the common effect of phase compensating circuit and signal synthesizer 24, each road interference signal of signal synthesis circuit 24 is entered into through every feedback branch, cancel out each other after signal synthesis circuit 24 synthesizes, and the output signal of the Signals & Systems of signal synthesizer output keeps consistent.Avoid from the extraneous interference signal interference to linear process unit 20, also achieve purpose linear process unit being controlled by the output signal of system simultaneously.Therefore, the embodiment of the present invention uses the simple signal synthesizer of circuit and phase compensating circuit to eliminate the outer signals interference to linear process unit, need not the outfan in balance amplification system and isolator or circulator are set, reduce the manufacturing cost of balance amplification system.
Second aspect, the embodiment of the present invention provides a kind of antenna system, including: linear process unit, feedback channel and N number of transmission channel；
Each described transmission channel includes combiner, N number of beamformer and N road amplifier and N number of antenna；The outfan of every road amplifier is connected to an antenna, and the input of No. i-th amplifier and the input of i+1 road amplifier access the different outfans of same combiner respectively through different beamformer；N is even number, and i is all odd numbers less than N；Enter the input signal of described system from the input of described system after described linear process cell processing, enter described transmission channel:
Described feedback channel includes signal synthesizer and N bar feedback branch；Described feedback channel is for coupling the output signal of described system and processing coupled signal, and the signal after processing is input to described linear process unit；Described linear process unit, for the input signal of system being contrasted with the output signal of system, makes described system become linearized system；
The outfan of jth road amplifier is connected with the input of j-th strip feedback branch, and the outfan of every feedback branch is respectively connecting to the input of described signal synthesizer；The outfan of described signal synthesizer is connected to described linear process unit；Wherein, j is more than or equal to 1 and less than or equal to each natural number between N；
At least arranging a beamformer in a feedback branch in feedback branch described in N bar, if being provided with waveform figuration device in xth bar feedback branch, the waveform figuration device in xth bar feedback branch, for carrying out positive compensation to the output signal of xth road amplifier.X is for more than or equal to 1 and less than or equal to any one natural number between N；
In feedback branch under the common effect of waveform figuration device and described signal synthesis circuit, the signal of described signal synthesis circuit output keeps consistent with described system at the signal of the main lobe direction of synthesis of eating dishes without rice or wine.
In conjunction with second aspect, or, the first of first aspect mode in the cards, in the implementation that the second is possible, every feedback branch is provided with beamformer, the beamformer arranged in j-th strip feedback branch.The opposite in phase of the waveform figuration device being connected with the input of jth road amplifier.
In conjunction with second aspect, or, the first of first aspect and the second mode in the cards, in the implementation that the third is possible, N number of wave filter, jth wave filter are arranged between outfan and the i-th antenna of No. i-th amplifier.
In conjunction with second aspect, or, the first of first aspect to the third mode in the cards, in the 4th kind of possible implementation, described linear process unit is digital pre-distortion system or analog predistortion system.
In the antenna system that the embodiment of the present invention provides, the feedback branch of every road amplifier is arranged between the outfan of amplifier and the antenna being connected with this amplifier, N bar feedback branch at least arranges a beamformer in a feedback branch, in feedback branch under the common effect of waveform figuration device and signal synthesis circuit, signal synthesis circuit 62 output signal keeps consistent with antenna system at the signal of the main lobe direction of synthesis of eating dishes without rice or wine, achieve control module and pass through the antenna system purpose at the signal control line processing unit of the main lobe direction of synthesis of eating dishes without rice or wine, reach Liao Ge road amplifier and share the purpose of a feedback channel.
Accompanying drawing explanation
A kind of four-path balance amplification system structural representation that Fig. 1 provides for prior art
A kind of balance amplification system structural representation that Fig. 2 provides for the embodiment of the present invention；
A kind of two-way balance amplification system structural representation that Fig. 3 provides for the embodiment of the present invention；
A kind of four-path balance amplification system structural representation that Fig. 4 provides for the embodiment of the present invention；
The another kind of balance amplification system structural representation that Fig. 5 provides for the embodiment of the present invention；
The antenna system configuration schematic diagram that Fig. 6 A provides for prior art；
A kind of antenna system configuration schematic diagram that Fig. 6 B provides for the embodiment of the present invention；
The another kind of antenna system configuration schematic diagram that Fig. 7 provides for the embodiment of the present invention；
A kind of antenna system configuration schematic diagram including digital pre-distortion system that Fig. 8 provides for the embodiment of the present invention.
Detailed description of the invention
A kind of balance amplification system structural representation that Fig. 2 provides for the embodiment of the present invention.As in figure 2 it is shown, the balance amplification system that the present embodiment provides includes: linear process unit 20, amplification channel and feedback channel.Amplification channel includes the combiner 25 being positioned at outfan and is positioned at the combiner 22 and N road amplifier 21 of outfan.In this balance amplification system total way of amplifier be N, N be even number.Wherein, combiner can be 3dB electric bridge, such as 90 degree 3dB electric bridges, 180 degree of 3dB electric bridges.
As shown in Figure 2, in amplification channel, the input of No. i-th amplifier and the input of i+1 road amplifier are respectively connected to the outfan of same combiner, the outfan of No. i-th amplifier and the outfan of i+1 road amplifier carry out closing road by a combiner, and i is all odd numbers less than N.After input signal linear processing unit 20 processes, after the combiner branch of one end ground connection, have respectively entered the combiner 25 being connected with each road amplifier in.Fig. 2 illustrate only four-path balance amplification system, often increases two-way amplifier, needs to increase a combiner respectively at input side and outlet side.
Feedback channel includes signal synthesizer 24 and N bar feedback branch.Feedback channel is for coupling the output signal of described balance amplification system and processing coupled signal, and the signal after processing is input to linear process unit 20.Linear process unit 20, for the input signal of system being contrasted with the output signal of system, makes described balance amplification system become linearized system.Wherein, linear process unit 20 can be pre-distortion system, such as analog predistortion (AnalogPredistortion is called for short APD) system or digital pre-distortion (DigitalPredistortion is called for short DPD) system.
The outfan of jth road amplifier also input with j-th strip feedback branch is connected, and wherein, j is any one natural number more than or equal to 1 and less than or equal to N.It is, the feedback branch that outfan that j-th strip feedback branch is j-th strip amplifier connects, between outfan that the coupling port of j-th strip feedback branch is arranged on jth road amplifier and the input of combiner being connected with jth road amplifier.
The outfan of every feedback branch is respectively connecting to the input of signal synthesizer 24, and the outfan of signal synthesizer 24 is connected to linear process unit 20.
Further, as in figure 2 it is shown, feedback channel may also include control module 23.The outfan of signal synthesizer 24 is connected with the input of control module 23, and the outfan of control module 23 is connected with linear process unit 20.Control module 23 controls linear processing unit 20 by the output signal of system, i.e. by the signal control line processing unit 20 exported from the outfan shown in Fig. 2.
The signal entering into signal synthesis circuit includes that the output signal of every road amplifier and the outfan from system enter into each branch signal of the external interference signal of feedback channel.The output signal of every road amplifier enters into signal synthesis circuit through respective feedback branch.The interference signal entered from the outfan of system, after the combiner branch being positioned at system output, has respectively entered the combiner 22 being connected with each road amplifier out, enters into feedback channel after combiner 22 branch.It is, the interference signal after combiner 22 branch, enter into j-th strip feedback branch from the input of combiner 22.
In above-mentioned N bar feedback branch, at least a feedback branch is provided with phase compensating circuit, the such as phase shifter.Phase compensating circuit, is used for, to the interference signal entering into this feedback branch from the outfan of system, the output signal of the amplifier that this feedback branch connects being carried out positive compensation.The signal entering into feedback channel from the outfan of system is referred to as inversion signal, and the signal entering into feedback channel from the outfan of each road amplifier is referred to as positive phase signals or useful signal.
Signal synthesis circuit 24, for synthesizing the signal of every feedback branch output so that the interference signal of every feedback branch output is cancelled out each other.This signal synthesis circuit 24, it is also possible that the signal of described signal synthesis circuit output is consistent with the holding of signal that the outfan of described system exports, all keeps consistent including features such as making both amplitude and phase place.The signal of every feedback branch output is after signal synthesis circuit 24 synthesizes, and the interference signal of every feedback branch output is cancelled out each other.Further, the useful signal of every feedback branch output, after signal synthesizer 24 processes and is overlapped mutually, keeps consistent with the signal of the outfan of system output.Therefore, the sampled signal that signal synthesis circuit 24 exports to control module 23, it is that the signal that the outfan with system exports keeps consistent signal, do not include the interference signal entered from the outfan of system, achieve purpose linear process unit being controlled by the output signal of system, avoid from the interference signal of outfan entrance system the interference of the output signal of useful signal Ji Ge road amplifier feedback channel simultaneously, thus avoid from the extraneous interference signal interference to linear process unit 20.Therefore, the present embodiment need not to arrange isolator or circulator is avoided from the extraneous interference signal interference to linear process unit 20 at the outfan of balance amplification system.
By foregoing description, between outfan that the coupling port of j-th strip feedback branch is arranged on jth road amplifier by the embodiment of the present invention and the input of combiner being connected with jth road amplifier, in order to make the output signal being input to the Signals & Systems outfan of control module 24 keep consistent, the embodiment of the present invention arranges phase compensating circuit at least one feedback branch.The outfan of every feedback branch is connected to signal synthesizer 24, in feedback branch under the common effect of phase compensating circuit and signal synthesizer 24, each road interference signal of signal synthesis circuit 24 is entered into through every feedback branch, cancel out each other after signal synthesis circuit 24 synthesizes, and further such that the output signal of Signals & Systems of signal synthesizer output keeps consistent.Avoid from the extraneous interference signal interference to linear process unit 20, also achieve purpose linear process unit being controlled by the output signal of system simultaneously.Therefore, the embodiment of the present invention uses the simple signal synthesizer of circuit and phase compensating circuit to eliminate the outer signals interference to linear process unit, need not the outfan in balance amplification system and isolator or circulator are set, reduce the manufacturing cost of balance amplification system.
Phase compensating circuit all can be set in every feedback branch, it is also possible to arranges phase compensating circuit in partial feedback branch road.Can be according to following principle, determine and phase compensating circuit and the phase value of set phase compensating circuit are set in which feedback branch: the interference signal of every feedback branch output is cancelled out each other after signal synthesizer 24 synthesizes, or, the output signal of the Signals & Systems that interference signal is cancelled out each other after signal synthesizer 24 synthesizes and signal synthesis circuit 24 exports of every feedback branch output keeps consistent.
Further, can be according to following condition setting phase compensating circuit: enter into the interference signal of signal synthesis circuit 24 through i-th feedback branch, with enter into the interference signal of described signal synthesis circuit 24 through i+1 bar feedback branch, cancel out each other after signal synthesizer 24 processes.It is, the interference signal of the feedback branch output of every two-way amplifier is cancelled out each other after signal synthesizer 24 synthesizes, so that the signal of signal synthesizer 24 output does not include disturbing signal.
For example, if the phase place of each combiner is 90 degree in amplification channel.In the embodiment of the present invention, the phase place of combiner refers to that two inputs of described combiner are to the phase contrast between two paths of outfan.Combiner has two inputs, has two paths, the phase contrast between two paths to be referred to as the phase place of combiner from input to outfan.
For reaching above-mentioned condition, phase compensating circuit all can be set in every feedback branch.The phase place of the phase compensating circuit in each feedback branch meets following condition: the phase difference value of the phase compensating circuit in i-th feedback branch and the phase compensating circuit in i+1 bar feedback branch, equal with the phase place of the combiner for the output signal of No. i-th amplifier to be carried out conjunction road with the output signal of i+1 road amplifier, i is all odd numbers less than N, and N is even number.Wherein, the phase place of the phase compensating circuit in the 1st article of feedback branch is zero, or, phase compensating circuit can be not provided with in the 1st article of feedback branch.After every feedback outlet arranges and meets the phase compensating circuit of above-mentioned phase condition, as shown in Figure 2, phase relation from the Coupling point of j-th strip feedback branch to system output, keep consistent with the phase relation between the Coupling point of j-th strip feedback branch to the input of signal synthesizer 24, the output signal making the Signals & Systems that signal synthesis circuit 24 exports keeps consistent, meanwhile, the signal of signal synthesizer 24 output does not include from extraneous interference signal.Wherein, j is all natural numbers more than 0 and less than or equal to N.
As a example by two-way balance amplification system and four-path balance amplification system, illustrate, in the case of outfan omits circulator or isolator, how to make linear process unit not affected by external interference signal individually below.
Two-way balance amplification system as shown in Figure 3, including two amplifiers 31 and 32 and two combiners: combiner 33 and combiner 34.In Fig. 3, each combiner is the 3dB electric bridge of 90 degree.The outfan of No. 1st amplifier 31 is connected with the signal synthesizer 36 in feedback channel, it is, be not provided with phase compensating circuit in the feedback branch of No. 1st amplifier 31.Article 2, the coupling port of feedback branch is arranged between outfan and the combiner 34 of No. 2nd amplifier.Article 2, the phase place of the phase shifter 35 in feedback branch is equal with the phase place of the combiner 34 that the outfan of No. 2nd amplifier connects.The phase place of combiner 34 is 90 degree, then the phase shifter 35 is 90 degree for phase place.For outer signals, combiner 34 is shunt, and outer signals enters two-way balance amplification system from combiner 34, after combiner 34 branch, is separately input to the 1st article of feedback branch and the 2nd feedback branch.The signal being input to the 2nd article of feedback branch differs 90 degree with original outer signals, and the signal being input to the 1st article of feedback branch differs 0 degree with original outer signals.Due to the displacement of combiner 34, the signal being input to the 1st article of feedback branch differs 90 degree with the signal entering the 2nd feedback branch.Afterwards, after being input to signal shifted device 35 displacement of the 2nd feedback branch, differing 180 degree from the signal of the 1st article of feedback branch output and the signal of the 2nd feedback branch output, two signals differing 180 degree are cancelled out each other after signal synthesizer synthesizes.
Enter the output signal of No. 2nd amplifier in the 2nd article of feedback branch after phase shifter 35 phase shift of 90 degree, 90 degree are differed with the output signal of No. 2nd amplifier, it is, the signal that the 2nd article of feedback branch is input to signal synthesizer 36 differs 90 degree with the output signal with No. 2nd amplifier.And the output signal of the output signal of No. 2nd amplifier and No. 2nd amplifier is after combiner 34 closes road, the output signal of No. 2nd amplifier also differs 90 degree with the output signal of system, therefore, to be input to the output signal of the useful signal of signal synthesizer 34 and No. 2nd amplifier identical for the 2nd article of feedback branch.Article 1, being not provided with the phase shifter in feedback branch, the signal that the output signal of No. 1st amplifier is input to signal synthesis circuit 36 with the 1st article of feedback branch does not has phase contrast, and the output signal of No. 1st amplifier and the output signal of system do not have phase contrast yet.Therefore, the 1st article of feedback branch is input to the useful signal of signal synthesis circuit, identical with the output signal of No. 1st amplifier.Thus, the 1st article of feedback branch is input to the useful signal of signal synthesis circuit and the 2nd article of feedback branch is input to the useful signal of signal synthesis circuit, keeps consistent with the output signal of system after signal synthesis circuit 36 is the most superimposed.
Four-path balance amplification system as shown in Figure 4, is the combiner of 90 degree including four amplifiers and six phase places.Wherein, following combiner is included: for the output signal of No. 1st amplifier and the output signal of No. 2nd amplifier carrying out closing road combiner 41, carrying out closing the combiner 42 on road for the output signal to No. 3rd amplifier and the output signal to No. 4th amplifier, and for the output signal of combiner 41 and the output signal of combiner 42 carry out closing the combiner 43 on road from the point of view of outfan.Following combiner is included: the combiner that outfan is connected respectively with the input of No. 1st amplifier and the input of No. 2nd amplifier from the point of view of input, the combiner that outfan is connected with the input of No. 3rd amplifier and the input of No. 4th amplifier respectively, and the combiner that input is connected with linear process unit.
The feedback branch of No. 1st amplifier that is the 1st article feedback branch is not provided with phase compensating circuit.Article 2, the coupling port of feedback branch is arranged between outfan and the input of combiner 41 of No. 2nd amplifier.Article 3, the coupling port of feedback branch is arranged between outfan and the input of combiner 42 of No. 3rd amplifier, and the coupling port of the 4th article of feedback branch is arranged between outfan and the input of combiner 42 of No. 4th amplifier.
Article 2, the phase place of the phase compensating circuit 44 in feedback branch is equal with the phase place of the combiner 41 that the outfan of No. 2nd amplifier connects, i.e. the phase place of phase compensating circuit 44 is equal with the phase place of combiner 41.Article 3, the phase place of the phase compensating circuit 45 in feedback branch is equal with the phase place of the combiner 42 that the outfan of No. 3rd amplifier connects, i.e. the phase place of phase compensating circuit 45 is equal with the phase place of combiner 42.The phase place of the phase compensating circuit 46 that the outfan of No. 4th amplifier connects is, the phase place of the combiner 42 that the outfan of No. 4th amplifier connects and the phase place sum of combiner 43.Article 2, in feedback branch, the phase place of phase shifter 44 is 90 degree, and the phase place of the phase shifter 45 in the 3rd article of feedback branch is 90 degree, and in the 4th article of feedback branch, the phase place of phase shifter 46 is 180 degree.Balance the phase relation between transmitting branch and the transmitting branch at amplifier place, i+1 road at amplifier place, No. i-th in amplification system, with the phase relation between the transmitting branch at the transmitting branch at amplifier place, the i-th+2 roads and the i-th+amplifier place, No. 3 keeps consistent, equally, balance the phase relation between i-th feedback branch and i+1 bar feedback branch in amplification system, with the phase relation between the i-th+2 feedback branches and the i-th+3 feedback branches keeps consistent, wherein, i is odd number.
Outer signals, after combiner 43 and combiner 41 branch, inputs the outer signals of the 1st article of feedback branch and the phase 90 degree of the outer signals of the 2nd article of feedback branch of input.After outer signals shifted device 44 displacement of the 2nd article of feedback branch input, differing 180 degree with the outer signals of the 1st article of feedback branch output, both cancel out each other after signal synthesizer closes road.Correspondingly, outer signals is successively after combiner 43 and combiner 42 branch, the outer signals inputting the 3rd article of feedback branch differs 90 degree with the outer signals entering combiner 43, the outer signals inputting the 4th article of feedback branch differs 180 degree with the outer signals entering combiner 43, thus, input the outer signals of the 3rd article of feedback branch and the phase 90 degree of the outer signals of the 4th article of feedback branch, after the displacement of phase shifter 45, article 3, the outer signals of feedback branch output differs 180 degree with the outer signals entering combiner 43, after the displacement of phase shifter 46, article 4, the outer signals of feedback branch output differs 360 degree with the outer signals entering combiner 43.Therefore, the outer signals 180 degree that the outer signals of the 3rd article of feedback branch output exports with the 4th article of feedback branch, after signal synthesizer synthesizes, both cancel out each other.
Therefore, the outer signals entered from the outfan of four-path balance amplification system, control module will not be input to from signal synthesizer, linear process unit is controlled by the output signal making control module pass through not to be mingled with the system of interference signal, thus avoids the outer signals interference to linear process unit.
In prior art, as it is shown in figure 1, be additionally provided with cavity body filter after outfan, circulator or isolator, to filter out the interference signal removed in the output signal of amplification system.Owing to the power of amplification system is relatively big, the wave filter arranged at amplification system outfan needs to be the wave filter that power is bigger, such as cavity body filter.But, the usual volume ratio of wave filter that power is bigger is relatively big, and the heaviest, cost is the highest.
In an embodiment of the present invention, as shown in Figure 5, on the basis of Fig. 2, it is provided with wave filter 25 between the input of the combiner that the outfan of every road amplifier and the outfan of described amplifier connect, to filter out in the output signal of every road amplifier the interference signal in addition to useful signal, such as, nonlinearity product signal.Due to, the power amplifier of amplification system Zhong Mei road amplifier is the least, outfan at every road amplifier can arrange the wave filter that power is little, such as, FBAR (FilmBulkAcousticResonator, it is called for short FBAR), surface acoustic wave (surfaceacousticwave is called for short SAW) wave filter.The cavity body filter that power is bigger is set from without the outfan in balance amplification system, reduces the production cost of balance amplification system further.
The antenna system configuration schematic diagram that Fig. 6 A provides for prior art.As shown in Figure 6A, being respectively connected with, in the antenna system Zhong Mei road amplification channel that prior art provides, the feedback channel including control module, each road amplification channel can not share a feedback channel.
A kind of antenna system configuration schematic diagram that Fig. 6 B provides for the embodiment of the present invention.As shown in Figure 6, the antenna system that the present embodiment provides includes: linear process unit 60, feedback channel and N number of transmission channel.Each transmission channel includes combiner, N number of wave beam forming (BeamForming is called for short BF) device and N road amplifier 64 and N number of antenna.Wherein, N is even number.Beamformer can be analog beam figuration (AnalogBeamForming is called for short ABF) device, it is also possible to be digital beam forming (DigitalBeamForming is called for short DBF) device.
As shown in Figure 6B, the outfan of every road amplifier is connected to an antenna.The input of No. i-th amplifier and the input of i+1 road amplifier access the different outfan of same combiner 63 respectively through different beamformer, and i is all odd numbers less than N.Input signal enters transmission channel after described linear process unit 60 processes.The beamformer that every road amplifier in connects, can be used for changing the directional diagram of the radiation of the amplitude of the signal being input to every road amplifier and phase place and then change antenna.
As shown in Figure 6B, feedback channel includes signal synthesizer 62 and N bar feedback branch；Described feedback channel is for coupling the output signal of described system and processing coupled signal, and the signal after processing is input to described linear process unit 60.Described linear process unit 60, for the input signal of system being contrasted with the output signal of system, makes described antenna system become linearized system.Linear process unit can be pre-distortion system, such as APD or DPD system.
The outfan of jth road amplifier is connected with the input of j-th strip feedback branch, and wherein, j is more than or equal to 1 and less than or equal to each natural number between N.It is, the coupling port of j-th strip feedback branch is arranged between outfan and the jth antenna of jth road amplifier.The outfan of every feedback branch is respectively connecting to the input of signal synthesizer 62.The outfan of signal synthesizer 62 is connected with linear process unit 60.
In N bar feedback branch, at least a feedback branch arranges a beamformer.If being provided with waveform figuration device in xth bar feedback branch, the waveform figuration device in xth bar feedback branch, for carrying out positive compensation to the output signal of xth road amplifier.Wherein, x is for more than or equal to 1 and less than or equal to any one natural number between N.In feedback branch under the common effect of waveform figuration device and signal synthesis circuit, signal synthesis circuit 62 exports the signal to control module 61 and keeps consistent with antenna system at the signal of the main lobe direction of synthesis of eating dishes without rice or wine.
Further, as shown in Figure 6B, feedback channel also includes control module 61.The outfan of signal synthesizer 62 is connected with the input of control module 61, and the input of control module 61 is connected to linear process unit 60.The described system that control module 61 is sampled by signal synthesizer 62 is at the signal control line processing unit 60 of the main lobe direction of synthesis of eating dishes without rice or wine.
In the antenna system that the embodiment of the present invention provides, the feedback branch of every road amplifier is arranged between the outfan of amplifier and the antenna being connected with this amplifier, N bar feedback branch at least arranges a beamformer in a feedback branch, in feedback branch under the common effect of waveform figuration device and signal synthesis circuit, signal synthesis circuit 62 output signal keeps consistent with antenna system at the signal of the main lobe direction of synthesis of eating dishes without rice or wine, keep consistent including making both at aspects such as amplitude and phase places, achieve by antenna system in the purpose of signal control line processing unit of the main lobe direction of synthesis of eating dishes without rice or wine, reach Liao Ge road amplifier and share the purpose of a feedback channel.
Further, every feedback branch is provided with and beamformer.The beamformer arranged in j-th strip feedback branch.The opposite in phase of the waveform figuration device being connected with the input of jth road amplifier, namely, the opposite in phase of the beamformer in the phase place of the beamformer in feedback branch and transmission channel, making to enter into each road signal in-phase stacking of signal synthesizer 62, signal synthesis circuit 62 exports the signal to control module 61 and keeps consistent with antenna system at the signal of the main lobe direction of synthesis of eating dishes without rice or wine.
As it is shown in fig. 7, also include N number of wave filter 66 on the basis of antenna system shown in Fig. 6.Jth wave filter is arranged between outfan and the i-th antenna of No. i-th amplifier, to filter out the interference signal in the output signal of every road amplifier, such as, nonlinearity product signal.The power of antenna system Zhong Mei road amplifier is the least, and the outfan at every road amplifier can arrange the wave filter that power is little, such as, FBAR or SAW, thus reduces the production cost of antenna system.
A kind of antenna system configuration schematic diagram including digital pre-distortion system that Fig. 8 provides for the embodiment of the present invention.As shown in Figure 8; input signal enters amplification channel through DBF; DBF connects four road DPD; the outfan of each DPD connects has digital-to-analogue to change circuit (DAC); the outfan of DAC connects multiplier i.e. converter; two multipliers connect through an ABF and an amplifier respectively through each outfan of combiner ∑ access shunt Div, shunt Div, and the outfan of every road amplifier connects wave filter.The outfan of every road amplifier is additionally provided with feedback branch, is provided with ABF in every feedback branch, and every feedback branch is connected through the input of signal combiner with DPD control module, and the outfan of DPD control module is connected to each DPD.Fig. 7 includes two DPD control modules, can share same DPD control module by switch, so that DBF and ABF shares a DPD control module.
In Fig. 8, linear processing unit is DPD, and in feedback channel, control module is DPD control module.The outfan of every road amplifier is provided with lower-powered wave filter.The feedback branch of every road amplifier is arranged on respective outfan, is provided with ABF, is also equipped with ABF in the transmission channel of every road amplifier in the feedback branch of every road amplifier.The ABF of transmission channel is used to changing the amplitude-phase launching signal and then changing antenna radiation pattern, the opposite in phase of the ABF in feedback channel and the ABF in transmission channel, ensure that the signal that each feedback branch exports is with being harmonious road at signal synthesis circuit, it is ensured that the signal power giving DPD reaches maximum.
Last it is noted that above example is only in order to illustrate technical scheme, it is not intended to limit；Although the present invention being described in detail with reference to previous embodiment, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein portion of techniques feature is carried out equivalent；And these amendments or replacement, do not make appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a balance amplification system, including: linear process unit, amplification channel and feedback channel；Described amplification channel includes combiner and N road amplifier；The input of No. i-th amplifier and the input of i+1 road amplifier are respectively connected to the outfan of same combiner, the outfan of No. i-th amplifier and the outfan of i+1 road amplifier and close road by a combiner；N is even number, and i is all odd numbers less than N；The input signal of described system enters described amplification channel after described linear process cell processing, it is characterised in that:
Described feedback channel includes signal synthesizer and N bar feedback branch；Described feedback channel is for coupling the output signal of described amplifier and processing coupled signal, and the signal after processing is input to described linear process unit；Described linear process unit, for the input signal of system being contrasted with the output signal of described signal synthesizer, makes described system become linearized system；
The outfan of jth road amplifier is connected with the input of j-th strip feedback branch, and the outfan of every feedback branch is respectively connecting to the input of described signal synthesizer, and the outfan of described signal synthesizer is connected to described linear process unit；Wherein, j is more than or equal to 1 and less than or equal to each natural number between N；
Described N bar feedback branch is at least provided with phase compensating circuit in a feedback branch, described phase compensating circuit carries out reverse compensation for the interference signal that the outfan from described system enters into the feedback branch at place, and the output signal of the amplifier that described feedback branch connects is carried out positive compensation；
Under the common effect of described phase compensating circuit and described signal synthesis circuit, the interference signal of every feedback branch output is cancelled out each other.
Balance amplification system the most according to claim 1, it is characterized in that, enter into the interference signal of described signal synthesis circuit through i-th feedback branch, and enter into the interference signal of described signal synthesis circuit through i+1 bar feedback branch, cancel out each other after described signal synthesizer processes；
I is all odd numbers less than N, and N is even number.
Balance amplification system the most according to claim 2, it is characterized in that, if the phase place of each combiner is 90 degree in described amplification channel, phase compensating circuit in described i-th feedback branch and the phase difference value of the phase compensating circuit in described i+1 bar feedback branch, equal with the phase place of the combiner for No. i-th amplifier carries out conjunction road with i+1 road amplifier, the phase place of described combiner refers to that two inputs of described combiner are to the phase contrast between two paths of outfan；
I is all odd numbers less than N, and N is even number.
Balance amplification system the most according to claim 3, it is characterised in that if N is 2, the phase place of the phase compensating circuit of the 2nd article of feedback branch is equal with the phase place of the combiner that the outfan of No. 2nd amplifier connects.
Balance amplification system the most according to claim 3, it is characterized in that, if N is 4, article 2, the phase place of the phase compensating circuit of feedback branch is equal with the phase place of the combiner A that the outfan of No. 2nd amplifier connects, article 3, the phase place of the phase compensating circuit in feedback branch is equal with the phase place of the combiner B that the outfan of No. 3rd amplifier connects, article 4, the phase place of the phase compensating circuit in feedback branch is, the phase place of the combiner B that the outfan of No. 4th amplifier connects and the phase place sum of combiner C, described combiner C is for carrying out closing road to the output signal of combiner A and combiner B.
6. according to the balance amplification system described in any one of claim 1 to 5, it is characterized in that, between the input of the combiner connected at the outfan of the outfan of jth road amplifier and described jth amplifier, it is provided with the wave filter disturbing signal except useful signal in addition in the output signal for filtering every road amplifier.
7. an antenna system, it is characterised in that including: linear process unit, feedback channel and N number of transmission channel；
Each described transmission channel includes combiner, N number of beamformer and N road amplifier and N number of antenna；The outfan of every road amplifier is connected to an antenna, and the input of No. i-th amplifier and the input of i+1 road amplifier access the different outfans of same combiner respectively through different beamformer；N is even number, and i is all odd numbers less than N；Enter the input signal of described system from the input of described system after described linear process cell processing, enter described transmission channel:
Described feedback channel includes signal synthesizer and N bar feedback branch；Described feedback channel is for coupling the output signal of described amplifier and processing coupled signal, and the signal after processing is input to described linear process unit；Described linear process unit, for the input signal of system being contrasted with the output signal of described signal synthesizer, makes described system become linearized system；The outfan of jth road amplifier is connected with the input of j-th strip feedback branch, and the outfan of every feedback branch is respectively connecting to the input of described signal synthesizer；The outfan of described signal synthesizer is connected to described linear process unit；Wherein, j is more than or equal to 1 and less than or equal to each natural number between N；
Feedback branch described in N bar at least arranges a beamformer in a feedback branch, if xth bar feedback branch is provided with waveform figuration device, waveform figuration device in xth bar feedback branch, for the output signal of xth road amplifier is carried out positive compensation, x is for more than or equal to 1 and less than or equal to any one natural number between N；
In feedback branch under the common effect of waveform figuration device and described signal synthesis circuit, the signal of described signal synthesis circuit output keeps consistent with described system at the signal of the main lobe direction of synthesis of eating dishes without rice or wine.
Antenna system the most according to claim 7, it is characterised in that be provided with beamformer in every feedback branch, the beamformer arranged in j-th strip feedback branch；The opposite in phase of the waveform figuration device being connected with the input of jth road amplifier.
9. according to the antenna system described in any one of claim 7 to 8, it is characterised in that also include: N number of wave filter, jth wave filter are arranged between outfan and the i-th antenna of No. i-th amplifier.
10. according to the antenna system described in any one of claim 7 to 8, it is characterised in that described linear process unit is digital pre-distortion system or analog predistortion system.
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| CN102055411A (en) * | 2010-12-22 | 2011-05-11 | 成都凯腾四方数字广播电视设备有限公司 | Power amplifier linearization correcting circuit and method based on multi-channel feedback |
| CN102570988A (en) * | 2010-12-23 | 2012-07-11 | 联咏科技股份有限公司 | Amplifier device |
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| JP4387936B2 (en) * | 2004-12-13 | 2009-12-24 | 株式会社東芝 | Doherty type high efficiency amplifier for high frequency and signal processing method thereof |
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| CN102055411A (en) * | 2010-12-22 | 2011-05-11 | 成都凯腾四方数字广播电视设备有限公司 | Power amplifier linearization correcting circuit and method based on multi-channel feedback |
| CN102570988A (en) * | 2010-12-23 | 2012-07-11 | 联咏科技股份有限公司 | Amplifier device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107276541A (en) * | 2017-06-14 | 2017-10-20 | 电子科技大学 | Variable vector mixes superposing type distortion linearizing method |
| CN107276541B (en) * | 2017-06-14 | 2020-06-30 | 电子科技大学 | Variable vector mixed superposition type predistortion linearization method |
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