CN106664269B

CN106664269B - A kind of analog predistortion APD correction system and method

Info

Publication number: CN106664269B
Application number: CN201580000955.XA
Authority: CN
Inventors: 叶四清; 尤览; 曹斌; 朱尔霓
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2015-05-30
Filing date: 2015-05-30
Publication date: 2019-11-29
Anticipated expiration: 2035-05-30
Also published as: CN106664269A; WO2016191993A1

Abstract

A kind of APD correction system and method, it is easy to accomplish.The system includes core cell, gain adjusting unit, error generation unit and training unit, wherein: core cell, it is delayed to system input signal, obtain the time delayed signal of the road N different delayed time, wherein time delayed signal is exported as feed-forward signal to error generation unit all the way, and N is the integer not less than 1；And according to system input signal, the time delayed signal and APD coefficient of the road N different delayed time, the input signal of power amplifier PA is obtained, a part is coupled out in the output signal of PA as feedback signal；Gain adjusting unit is adjusted the gain of feedback signal, obtains feedback adjustment signal, and exports feedback adjustment signal to error generation unit；Error generation unit generates the error signal of feed-forward signal and feedback adjustment signal, and output error signal is to training unit；Training unit determines APD coefficient according to error signal, and exports APD coefficient to core cell.

Description

A kind of analog predistortion APD correction system and method

Technical field

The present invention relates to the communications field, in particular to a kind of analog predistortion corrects system and method.

Background technique

PA (Power Amplifier, power amplifier) is the amplifier that a kind of pair of signal power amplifies, and is usually answered With in the field of communications.For example, in a base station of a mobile communication system, usually being put using power of the PA to signal to be transmitted Greatly, still, it since PA has magnification distortion, so that there is distortion by the amplified signal to be transmitted of PA, affects Communication quality.

In order to guarantee communication quality, usually all DPD (Digital Pre-Distortion, digital pre-distortion) is used at present System is corrected the PA distortion generated, to eliminate by being distorted existing for the amplified signal of PA.But some scenes, more Add and is suitble to be corrected the PA distortion generated using APD (Analog Pre-Distortion, analog predistortion) system, with It eliminates by the existing distortion of the amplified signal of PA.

APD in the prior art correction system is as shown in Figure 1, include straight-through/time delay module 101, nucleus module 102, preceding Present receiver 103, feedback receiver 104 and training module 105, in which:

Straight-through/time delay module 101 receives system input signal, direct output system input signal, or inputs to system Signal is delayed, and obtains time delayed signal output all the way；

Nucleus module 102 receives the APD coefficient that system input signal and training module 105 export, is inputted according to system Signal and APD coefficient generate pre-distorted signals output；The output signal of straight-through/time delay module 101 and nucleus module 102 The mixed signal of output signal is the input signal of PA, and PA is exported after carrying out power amplification to the mixed signal；

Feedover receiver 103, receives system input signal, carries out down coversion, analog-to-digital conversion process, obtains feed forward digital letter Number output is to training module 105；

Feedback receiver 104 receives the output signal of PA, carries out down coversion, analog-to-digital conversion process, obtains feedback digital letter Number output is to training module 105；

Training module 105, what the feed forward digital signal and feedback receiver 104 for receiving the feedforward output of receiver 103 exported Feedback digital signal determines APD coefficient, output to nucleus module 102 according to the feed forward digital signal and feedback digital signal.

However, APD in the prior art correction system needs two receivers, not only higher cost, implement also compared with For complexity.

Summary of the invention

The embodiment of the present invention provides a kind of APD correction system and method, it is easier to realize.

In a first aspect, provide a kind of APD correction system, including core cell, gain adjusting unit, error generation unit and Training unit, in which:

The core cell, for receiving the APD coefficient of system input signal and training unit output；To described System input signal is delayed, and obtains the time delayed signal of the road N different delayed time, wherein time delayed signal is defeated as feed-forward signal all the way Out to the error generation unit, N is the integer not less than 1；And it is not co-extensive according to the system input signal, the road N When time delayed signal and the APD coefficient, obtain the input signal of power amplifier PA, one be coupled out in the output signal of PA It is allocated as feedback signal；

The gain adjusting unit is adjusted the gain of the feedback signal, obtains for receiving the feedback signal To feedback adjustment signal, and the feedback adjustment signal is exported to the error generation unit；

The error generation unit, for receiving the feed-forward signal and the gain adjustment list of the core cell output The feedback adjustment signal of member output generates the error signal of the feed-forward signal and the feedback adjustment signal, and described in output Error signal is to the training unit；

The training unit, for receiving the error signal of error generation unit output, according to the error signal, It determines the APD coefficient, and exports the APD coefficient to the core cell.

With reference to first aspect, in the first possible implementation, the training unit, including variable gain amplification Device, power detector, analog-digital converter and coefficient training module, in which:

The variable gain amplifier is adjusted for the gain to the error signal, obtains error transfer factor signal；

The power detector detects for the mean power to the error transfer factor signal, obtains error power Signal；

The analog-digital converter obtains error power number letter for carrying out analog-to-digital conversion to the error power signal Number；

The coefficient training module, for determining the APD coefficient according to the error power digital signal.

With reference to first aspect, in the second possible implementation, the training unit, including receiver and coefficient instruction Practice module, in which:

The receiver obtains error number letter for carrying out down coversion, analog-to-digital conversion process to the error signal Number；

The coefficient training module, for determining the APD coefficient according to the error digital signal.

With reference to first aspect, second of possibility of the first possible implementation of first aspect or first aspect Implementation, in the third possible implementation, the core cell, including N number of delayer, nonlinear block, M Digital vector modulator and adder, the APD coefficient include nonlinear factor and M linear coefficient, 1≤M≤N+1, in which:

N number of delayer series connection, for being delayed to the system input signal, obtains prolonging for the road N different delayed time When signal；

The nonlinear block, for according to the system input signal, the time delayed signal of the road N different delayed time and institute Nonlinear factor is stated, non-linear predistortion signal is generated；

Described M digital vector modulator, one of digital vector modulator are other as rear digital vector modulator M-1 digital vector modulator is as preceding digital vector modulator；The system input signal and the road N different delayed time are prolonged When signal composition the road N+1 signal in, time delayed signal centered on signal, other roads N signal are believed as non-central delay all the way Number；In the M linear coefficient, the output signal of a linear coefficient and the adder is corresponding, other M-1 linear coefficients It is corresponded with the non-central time delayed signal in the non-central road time delayed signal Zhong M-1 in the road N；Digital vector modulator carries out institute before each State the multiplying of the non-central all the way time delayed signal and corresponding linear coefficient in the non-central time delayed signal in the road M-1；

The adder, digital vector before carrying out the non-linear predistortion signal, the center time delayed signal, M-1 The add operation of the output signal of modulator；

Digital vector modulator carries out the output signal of the adder and the multiplying of corresponding linear coefficient after described, Obtain the input signal of PA.

With reference to first aspect, second of possibility of the first possible implementation of first aspect or first aspect Implementation, in the fourth possible implementation, the core cell, including N number of delayer, nonlinear block, M Digital vector modulator and adder, the APD coefficient include nonlinear factor and M linear coefficient, 1≤M≤N+1, in which:

The M digital vector modulator, digital vector modulator centered on one of digital vector modulator, Its M-1 digital vector modulator is as non-central digital vector modulator；The system input signal and the road N be not co-extensive When time delayed signal composition the road N+1 signal in, time delayed signal centered on signal all the way, other roads N signal is as non-central Time delayed signal；In the M linear coefficient, a linear coefficient and the center time delayed signal are corresponding, other M-1 linear systems The non-central time delayed signal in the several and non-central road time delayed signal Zhong M-1 in the road N corresponds；The center number vector modulator into The multiplying of row the center time delayed signal and corresponding linear coefficient, each non-central digital vector modulator carry out the M- The multiplying of non-central all the way time delayed signal and corresponding linear coefficient in the non-central time delayed signal in 1 road；

The adder carries out the output signal of the non-linear predistortion signal, the M digital vector modulator Add operation obtains the input signal of PA.

Second aspect provides a kind of APD bearing calibration, comprising:

It is delayed to system input signal, obtains the time delayed signal of the road N different delayed time, N is the integer not less than 1；

According to the system input signal, the time delayed signal and APD coefficient of the road N different delayed time, power amplification is obtained The input signal of device PA；Wherein, the APD coefficient determines in the following way:

It is coupled out a part in the output signal of PA as feedback signal, the gain of the feedback signal is adjusted, Obtain feedback adjustment signal；Time delayed signal all the way in the time delayed signal of the road N generates the feed-forward signal as feed-forward signal With the error signal of the feedback adjustment signal；According to the error signal, the APD coefficient is determined.

In conjunction with second aspect, in the first possible implementation, according to the error signal, the APD system is determined Number, specifically includes:

The gain of the error signal is adjusted, error transfer factor signal is obtained；

The mean power of the error transfer factor signal is detected, error power signal is obtained；

Analog-to-digital conversion is carried out to the error power signal, obtains error power digital signal；

According to the error power digital signal, the APD coefficient is determined.

In conjunction with second aspect, in the second possible implementation, according to the error signal, the APD system is determined Number, specifically includes:

Down coversion, analog-to-digital conversion process are carried out to the error signal, obtain error digital signal；

According to the error digital signal, the APD coefficient is determined.

In conjunction with second aspect, second of possibility of the possible implementation of the first of second aspect or second aspect Implementation, in the third possible implementation, the APD coefficient includes nonlinear factor and M linear coefficient, 1 ≤M≤N+1；

According to the system input signal, the time delayed signal and APD coefficient of the road N different delayed time, the input of PA is obtained Signal specifically includes:

According to the system input signal, the time delayed signal and the nonlinear factor of the road N different delayed time, generate non- Linear pre-distorted signals；

In the road the N+1 signal of the system input signal and the time delayed signal of the road N different delayed time composition, signal all the way Centered on time delayed signal, other roads N signal is as non-central time delayed signal；In the M linear coefficient, M-1 linear systems The non-central time delayed signal in the several and non-central road time delayed signal Zhong M-1 in the road N corresponds；Carry out the non-central delay in the road M-1 The multiplying of the road signal Zhong Mei non-central time delayed signal and corresponding linear coefficient；

Carry out the non-linear predistortion signal, the center time delayed signal, M-1 multiplying output signal plus Method operation；

A linear coefficient and the add operation in the M linear coefficient, in addition to the M-1 linear coefficient Output signal it is corresponding；The output signal of the add operation and the multiplying of corresponding linear coefficient are carried out, the defeated of PA is obtained Enter signal.

In conjunction with second aspect, second of possibility of the possible implementation of the first of second aspect or second aspect Implementation, in the fourth possible implementation, the APD coefficient includes nonlinear factor and M linear coefficient, 1 ≤M≤N+1；

In the road the N+1 signal of the system input signal and the time delayed signal of the road N different delayed time composition, signal all the way Centered on time delayed signal, other roads N signal is as non-central time delayed signal；In the M linear coefficient, a linear coefficient Corresponding with the center time delayed signal, the non-central road time delayed signal Zhong M-1 of other M-1 linear coefficients and the road N is non-central to prolong When signal correspond；Carry out the center time delayed signal and the multiplying of corresponding linear coefficient and the M-1 Lu Feizhong The multiplying of the road heart time delayed signal Zhong Mei non-central time delayed signal and corresponding linear coefficient；

Carry out the non-linear predistortion signal, M multiplying output signal add operation, obtain the input of PA Signal.

The third aspect, provides a kind of APD correction system, including core cell, gain adjusting unit, error generation unit and Training unit, in which:

The core cell, for receiving the APD coefficient of system input signal and training unit output, according to institute System input signal and the APD coefficient are stated, the input signal of power amplifier PA is obtained, is coupled out one in the output signal of PA Part is used as feedback signal；

The error generation unit, for receive the system input signal and the gain adjusting unit output it is anti- Adjustment signal is presented, the system input signal generates the feed-forward signal and the feedback adjustment signal as feed-forward signal Error signal, and the error signal is exported to the training unit；

In conjunction with the third aspect, in the first possible implementation, the training unit, including variable gain amplification Device, power detector, analog-digital converter and coefficient training module, in which:

In conjunction with the third aspect, in the second possible implementation, the training unit, including receiver and coefficient instruction Practice module, in which:

In conjunction with the third aspect, second of possibility of the possible implementation of the first of the third aspect or the third aspect Implementation, in the third possible implementation, the core cell, including nonlinear block, digital vector modulation Device and adder, the APD coefficient includes nonlinear factor and linear coefficient, in which:

The nonlinear block, for generating non-linear pre- according to the system input signal and the nonlinear factor Distorted signal；

The adder carries out the add operation of the non-linear predistortion signal, the system input signal；

The digital vector modulator carries out the output signal of the adder and the multiplying of the linear coefficient, obtains To the input signal of PA.

In conjunction with the third aspect, second of possibility of the possible implementation of the first of the third aspect or the third aspect Implementation, in the fourth possible implementation, the core cell, including nonlinear block, digital vector modulation Device and adder, the APD coefficient includes nonlinear factor and linear coefficient, in which:

The digital vector modulator, carries out the multiplying of the system input signal Yu the linear coefficient；

The adder carries out adding for the output signal of the non-linear predistortion signal, the digital vector modulator Method operation obtains the input signal of PA.

Fourth aspect provides a kind of APD bearing calibration, comprising:

It is coupled out a part in the output signal of power amplifier PA and is used as feedback signal, the gain to the feedback signal It is adjusted, obtains feedback adjustment signal；

System input signal generates the error letter of the feed-forward signal and the feedback adjustment signal as feed-forward signal Number；

According to the error signal, the APD coefficient is determined；

According to the system input signal and the APD coefficient, the input signal of PA is obtained.

In conjunction with fourth aspect, in the first possible implementation, according to the error signal, the APD system is determined Number, specifically includes:

According to the error power digital signal, the APD coefficient is determined.

In conjunction with fourth aspect, in the second possible implementation, according to the error signal, the APD system is determined Number, specifically includes:

According to the error digital signal, the APD coefficient is determined.

In conjunction with fourth aspect, second of possibility of the possible implementation of the first of fourth aspect or fourth aspect Implementation, in the third possible implementation, the APD coefficient includes nonlinear factor and linear coefficient；

According to the system input signal and the APD coefficient, the input signal of PA is obtained, is specifically included:

According to the system input signal and the nonlinear factor, non-linear predistortion signal is generated；

Carry out the add operation of the non-linear predistortion signal, the system input signal；

The output signal of the add operation and the multiplying of the linear coefficient are carried out, the input signal of PA is obtained.

In conjunction with fourth aspect, second of possibility of the possible implementation of the first of fourth aspect or fourth aspect Implementation, in the fourth possible implementation, the APD coefficient includes nonlinear factor and linear coefficient；

Carry out the multiplying of the system input signal Yu the linear coefficient；

Carry out the non-linear predistortion signal, the multiplying output signal add operation, obtain the defeated of PA Enter signal.

System, the APD bearing calibration that second aspect provides are corrected according to the APD that first aspect provides, the third aspect provides APD correct system, the APD bearing calibration that fourth aspect provides, core cell receives system input signal and training unit The APD coefficient of output, is delayed to system input signal, obtains the time delayed signal of the road N different delayed time, wherein delay letter all the way Number export to error generation unit as feed-forward signal, and according to system input signal, the road N different delayed time time delayed signal and APD coefficient obtains the input signal of PA, and a part is coupled out in the output signal of PA as feedback signal；Gain adjusting unit Feedback signal is received, the gain of feedback signal is adjusted, feedback adjustment signal is obtained, and exports the feedback adjustment signal extremely Error generation unit；Error generation unit receives the time delayed signal of core cell output and the feedback of gain adjusting unit output Adjustment signal, generates the error signal of feed-forward signal and feedback adjustment signal, and exports the error signal to training unit；Training The error signal that unit receives the output of error generation unit determines APD coefficient according to the error signal, and exports the APD coefficient To core cell.Obviously, using scheme provided in an embodiment of the present invention, the school to PA can be realized without two receivers Just, not only cost is relatively low, and it is also more easy to implement.

Detailed description of the invention

Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, is implemented with the present invention Example is used to explain the present invention together, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the structural schematic diagram that APD corrects system in the prior art；

Fig. 2 is one of the structural schematic diagram that APD provided in an embodiment of the present invention corrects system；

Fig. 3 is one of the structural schematic diagram of core cell in APD correction system provided in an embodiment of the present invention；

Fig. 4 is the second structural representation of core cell in APD correction system provided in an embodiment of the present invention；

Fig. 5 is the third structural representation of core cell in APD correction system provided in an embodiment of the present invention；

Fig. 6 is four of the structural schematic diagram of core cell in APD correction system provided in an embodiment of the present invention；

Fig. 7 is five of the structural schematic diagram of core cell in APD correction system provided in an embodiment of the present invention；

Fig. 8 is the structural schematic diagram that APD provided in an embodiment of the present invention corrects nonlinear block in the core cell of system；

Fig. 9 is that the structure of digital vector modulator in the core cell of APD provided in an embodiment of the present invention correction system is shown It is intended to；

Figure 10 is the structural schematic diagram that the APD that the embodiment of the present invention 1 provides corrects system；

Figure 11 is the structural schematic diagram that the APD that the embodiment of the present invention 2 provides corrects system；

Figure 12 is the structural representation that the APD that the embodiment of the present invention 2 provides corrects quadrature demodulator in the training unit of system Figure；

Figure 13 is one of the flow diagram of APD bearing calibration provided in an embodiment of the present invention；

Figure 14 is the second structural representation that APD provided in an embodiment of the present invention corrects system；

Figure 15 is six of the structural schematic diagram of core cell in APD correction system provided in an embodiment of the present invention；

Figure 16 is the two of the flow diagram of APD bearing calibration provided in an embodiment of the present invention.

Specific embodiment

In order to provide the APD correcting scheme being easily achieved, the embodiment of the invention provides a kind of APD correction system and sides Method, below in conjunction with Figure of description, preferred embodiment of the present invention will be described, it should be understood that preferred reality described herein Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.And in the absence of conflict, in the application Feature in embodiment and embodiment can be combined with each other.

The embodiment of the present invention provides a kind of APD correction system, as shown in Fig. 2, may include core cell 201, gain tune Whole unit 202, error generation unit 203 and training unit 204, in which:

Core cell 201, the APD coefficient exported for receiving system input signal and training unit 204；It is defeated to system Enter signal to be delayed, obtain the time delayed signal of the road N different delayed time, wherein time delayed signal is exported as feed-forward signal to accidentally all the way Poor generation unit 203, N are the integer not less than 1；And according to system input signal, the road N different delayed time time delayed signal and APD coefficient obtains the input signal of PA, and PA amplifies input signal, and a part of conduct is coupled out in the output signal of PA Feedback signal；

Gain adjusting unit 202 is adjusted the gain of the feedback signal, is fed back for receiving feedback signal Adjustment signal is the feedback signal being adjusted, and exports the feedback adjustment signal to error generation unit 203；

Error generation unit 203, for receiving the feed-forward signal and gain adjusting unit 202 of the output of core cell 201 The feedback adjustment signal of output, generates the error signal of feed-forward signal and feedback adjustment signal, and exports the error signal to instruction Practice unit 204；

Training unit 204, according to the error signal, is determined for receiving the error signal of the output of error generation unit 203 APD coefficient, and the APD coefficient is exported to core cell 201.

Training unit 204 by adjusting APD coefficient, the linear characteristic of Lai Shixian core cell 201 and nonlinear characteristic Adjustment makes error signal level off to 0 as far as possible, that is, to keep feedback adjustment signal consistent with feed-forward signal, that is, make PA output signal It is consistent with width phase modulation intelligence, that is, signal amplitude of system input signal and the phase characteristic that changes with time, to reach PA Predistortion.

In APD correction system provided in an embodiment of the present invention, core cell 201 has a variety of implementations, such as:

Mode one:

Core cell 201, including N number of delayer, nonlinear block, M DVM (Digital Vector Modulator, Digital vector modulator) and adder, APD coefficient include nonlinear factor and M linear coefficient, 1≤M≤N+1, in which:

N number of delayer series connection, for being delayed to system input signal, obtains the time delayed signal of the road N different delayed time；

Nonlinear block, it is raw for the time delayed signal and nonlinear factor according to system input signal, the road N different delayed time At non-linear predistortion signal；

DVM centered on M DVM, one of DVM, other M-1 DVM are as non-central digital vector modulator；System In the road the N+1 signal of the time delayed signal composition for input signal and the road the N different delayed time of uniting, time delayed signal centered on signal all the way, Other roads N signal is as non-central time delayed signal；In M linear coefficient, a linear coefficient and center time delayed signal are corresponding, The non-central time delayed signal in the non-central road time delayed signal Zhong M-1 of its M-1 linear coefficient and the road N corresponds；Center DVM is carried out The multiplying of center time delayed signal and corresponding linear coefficient, each non-central DVM are carried out in the non-central time delayed signal in the road M-1 The multiplying of non-central time delayed signal and corresponding linear coefficient all the way；

Adder carries out the add operation of the output signal of non-linear predistortion signal, M DVM, and the input for obtaining PA is believed Number.

For example, as N=2, M=N+1, core cell 201 that employing mode one is realized as shown in figure 3, at this point it is possible to but It is not limited to select to be delayed relative to system input signal maximum time delayed signal as feed-forward signal.

Preferably, core cell 201 can also use two adders of first adder and second adder, the first addition Device carries out the add operation of the output signal of M DVM, second adder progress non-linear predistortion signal, first adder The add operation of output signal, also, be connected between first adder and second adder by buffer amplifier Buf, it can be with Interference caused by preventing the output signal of core cell 201 from revealing forward to feed-forward signal.Provided in an embodiment of the present invention In APD correction system, to keep feedback adjustment signal consistent with feed-forward signal by adjusting APD coefficient, therefore the feed-forward signal The substantially study model signal of feedback adjustment signal, feed-forward signal, which is interfered, will deteriorate system performance.

At this point, core cell 201 shown in Fig. 3 is as shown in Figure 4.

Mode two:

Core cell 201, including N number of delayer, nonlinear block, M DVM and adder, APD coefficient include non-linear Coefficient and M linear coefficient, 1≤M≤N+1, in which:

M DVM, one of DVM are as rear DVM, and other M-1 DVM are as preceding DVM；System input signal and the road N are not In the road N+1 signal with the time delayed signal composition of delay, time delayed signal centered on signal all the way, other roads N signal is as non- Center time delayed signal；In M linear coefficient, the output signal of a linear coefficient and adder is corresponding, other M-1 linear systems The non-central time delayed signal in the several and non-central road time delayed signal Zhong M-1 in the road N corresponds；It is non-central to carry out the road M-1 by DVM before each The multiplying of non-central all the way time delayed signal and corresponding linear coefficient in time delayed signal；

Adder, the addition fortune of the output signal of DVM before carrying out non-linear predistortion signal, center time delayed signal, M-1 It calculates；

DVM carries out output signal and the multiplying of corresponding linear coefficient of adder afterwards, obtains the input signal of PA.

The core cell 201 that employing mode two is realized, the DVM of output end be after DVM can power level to signal into Row is adjusted, and the output signal of core cell 201 is made to adapt to the power level requirement of the input signal of different PA.

Preferably, the selection of center time delayed signal and feed-forward signal can follow following principles: center delay as N >=2 Signal is substantially equal to feed-forward signal relative to system relative to the sum of the delay length of system input signal and the delay length of PA The delay length of input signal.When it is implemented, center time delayed signal can be big relative to the delay length of system input signal Cause for relative to system input signal be delayed maximum time delayed signal delay length half；Selecting center time delayed signal Afterwards, select which time delayed signal as feed-forward signal further according to mentioned above principle determination, naturally it is also possible to first determine feed-forward signal Center time delayed signal is determined again, is not limited herein.

For example, the core cell 201 that employing mode two is realized is as shown in figure 5, include 2 delays as N=2, M=N+1 Device, nonlinear block, 3 DVM and adder；Wherein: the delay length that the delay length of delayer 1 is equal to delayer 2 is equal to The delay length of PA, 2 delayer series connection, is delayed to system input signal, obtains the time delayed signal of 2 tunnel different delayed times； At this point, time delayed signal centered on the time delayed signal that delayer 1 exports, the time delayed signal that delayer 2 exports as feed-forward signal, It also is non-central time delayed signal；Nonlinear block, according to system input signal, the time delayed signal of 2 tunnel different delayed times and non-linear Coefficient generates non-linear predistortion signal；DVM0 is as rear DVM, DVM1 and DVM2 as preceding DVM in 3 DVM；DVM1 is carried out The multiplying of system input signal and linear coefficient 1, DVM2 carry out the time delayed signal and linear coefficient 2 that delayer 2 exports Multiplying；Adder, carry out non-linear predistortion signal, delayer 1 export time delayed signal, DVM1 output signal and The add operation of the output signal of DVM2；DVM3 carries out the output signal of adder and the multiplying of linear coefficient 3, obtains PA Input signal.

Preferably, core cell 201 can also use two adders of first adder and second adder, the first addition Device carries out the add operation of the output signal of center time delayed signal, N number of preceding DVM, and second adder carries out non-linear predistortion letter Number, the add operation of the output signal of first adder, also, pass through Hyblid Buffer Amplifier between first adder and second adder Device Buf is connected, the interference caused by can preventing the output signal of core cell 201 from revealing forward to feed-forward signal.

At this point, core cell 201 shown in fig. 5 is as shown in Figure 6.

As N=1, M=N+1, the core cell 201 that employing mode two is realized is as shown in fig. 7, comprises 1 delayer, non- Linear block, 2 DVM and adder；At this point it is possible to using the time delayed signal of delayer output as feed-forward signal, system is defeated Enter time delayed signal centered on signal, the time delayed signal of delayer output is as non-central time delayed signal, specific structure and change This will not be detailed here for type structure.

Further, in aforesaid way one and the core cell of mode two 201, the quantity N of delayer can be odd number, It can be even number；The delay length of N number of delayer can be different, can also be identical.The quantity and delay length of specific delayer It can be set based on actual needs, not be limited herein.

It should be noted that, as N >=2, N number of delayer can also use it in other implementations of the invention Its mode connects, as long as the time delayed signal of the road N different delayed time can be obtained, any connection type of N number of delayer.For example, It can connect to obtain the time delayed signal of multichannel different delayed time using multiple delayers, wherein being delayed centered on time delayed signal all the way Signal uses a special delayer to be delayed to generate feed-forward signal system input signal, alternatively, using special To certain in the time delayed signal of multichannel different delayed time, time delayed signal is delayed one delayer again all the way, to generate feedforward letter Number.

Further, in aforesaid way one and the core cell of mode two 201, nonlinear block specifically can be such as Fig. 8 institute Show, including envelope submodule 801 and acting matrix submodule 802, in which:

Envelope submodule 801 carries out envelope detected to system input signal, obtains the road L for receiving system input signal The input envelope signal of different delayed time, and the input envelope signal of the road the L different delayed time is exported to acting matrix submodule 802；L is the integer not less than 1, can be equal with N, can also be unequal with N；

Acting matrix submodule 802, for receiving the time delayed signal of the road N different delayed time, the input envelope of the road L different delayed time Signal and nonlinear factor, according to the time delayed signal of the road the N different delayed time, the input envelope signal of the road L different delayed time and non-thread Property coefficient generates non-linear predistortion signal.

Envelope submodule 801 and acting matrix submodule 802 are implemented as the prior art, and this will not be detailed here.

Optionally, in aforesaid way one and the core cell of mode two 201, DVM can be real using structure shown in Fig. 9 It is existing, including QPS (Quadrature Phase Splitter, orthogonal phase splitter), subtracter and two multipliers, above-mentioned each line Property coefficient is complex coefficient, and the real part of complex coefficient is in-phase coefficient shown in Fig. 9, and the imaginary part of complex coefficient is institute in Fig. 9 The orthogonal coefficient shown, specific:

QPS carries out quadrature splitter to the input signal of DVM；

A multiplier carries out the multiplying of the in-phase signal and in-phase coefficient of QPS output in two multipliers；It is another A multiplier carries out the orthogonal signalling of QPS output and the multiplying of orthogonal coefficient；

Subtracter carries out the subtraction of the output signal of two multipliers；The output signal of the subtracter is DVM Output signal.

In APD correction system provided in an embodiment of the present invention, gain adjusting unit 202 can be by VGA (Variable Gain Amplifier, variable gain amplifier) it realizes, the gain and the increasing of the output signal of system input signal to PA of VGA It is beneficial related, it therefore, can be according to the gain requirements of the output signal of system input signal to PA, to configure VGA when actual implementation Gain.

In APD correction system provided in an embodiment of the present invention, error generation unit 203 can be realized that this subtracts by subtracter Musical instruments used in a Buddhist or Taoist mass carries out the subtraction of feed-forward signal and feedback adjustment signal to be believed to get to the error of feed-forward signal and feedback adjustment signal Number.

In APD correction system provided in an embodiment of the present invention, training unit 204 also has a variety of implementations, ties below Attached drawing is closed, is described in detail with specific embodiment.

Embodiment 1:

The APD that the embodiment of the present invention 1 provides corrects system, and as shown in Figure 10, core cell 201 can use foregoing manner One realizes, can also be realized using foregoing manner two；Gain adjusting unit 202 can be realized using VGA；Error generation unit 203 can be realized using subtracter；Training unit 204, according to the power for the error signal that error generation unit 203 exports, really APD coefficient is determined, specifically, training unit 204, may include VGA, PDET (Power Detector, power detector), ADC (Analog to Digital Converter, analog-digital converter) and coefficient training module, in which:

VGA is adjusted the gain of the error signal for receiving error signal, obtains error transfer factor signal, output The error transfer factor signal is to PDET；

PDET examines the mean power of the error transfer factor signal for receiving the error transfer factor signal of VGA output It surveys, obtains error power signal, export the error power signal to ADC；

ADC carries out analog-to-digital conversion to the error power signal, obtains for receiving the error power signal of PDET output Error power digital signal exports the error power digital signal to coefficient training module；

Coefficient training module is believed for receiving the error power digital signal of ADC output according to the error power number Number, it determines APD coefficient, the error power digital signal is made to level off to 0.

When it is implemented, can by coefficient training module to VGA carry out AGC (Automatic Gain Control, automatically Gain control), the gain of VGA is controlled, and then control the adjustment amplitude of the gain to error signal, the error function for inputting ADC Rate signal consistently remains close to ADC full scale, and does not allow ADC to be saturated, and ADC can be made to obtain most adequately utilizing in this way, made The SNR (Signal to Noise Ratio, signal-to-noise ratio) of ADC output signal is maximum, so as to make coefficient training module most quasi- The size for really seeing error signal is conducive to coefficient training.

System is corrected using the APD that the embodiment of the present invention 1 provides, does not need receiver；ADC in training unit 204 is Analog-to-digital conversion is carried out to error power signal, it is right since error power signal is a slowly varying signal at any time The performance requirement of ADC is lower, is not only easy to realize, more greatly reduces system cost.

Embodiment 2:

The APD that the embodiment of the present invention 2 provides corrects system, and as shown in figure 11, core cell 201 can use foregoing manner One realizes, can also be realized using foregoing manner two；Gain adjusting unit 202 can be realized using VGA；Error generation unit 203 can be realized using subtracter；Training unit 204 may include receiver and coefficient training module, in which:

Receiver carries out down coversion, analog-to-digital conversion process to the error signal, obtains error for receiving error signal Digital signal, and the error digital signal is exported to coefficient training module；

Coefficient training module, according to the error digital signal, is determined for receiving the error digital signal of receiver output APD coefficient makes the error digital signal level off to 0.

Above-mentioned receiver is specifically as follows form shown in Figure 11, including VGA, QDM (Quadrature Demodulator, quadrature demodulator) and two ADC, AGC is carried out to the VGA in receiver by coefficient training module；Wherein:

VGA is adjusted the gain of the input signal of receiver；

QDM carries out down-converted to the output signal of VGA；

Two ADC carry out analog-to-digital conversion process to the two-way output signal of QDM respectively；The output signal of two ADC is For the output signal of receiver.

QDM structure is as shown in figure 12 in Figure 11, including -90 ° of phase shifters, two multipliers and two LPF (Low-Pass Filter, low-pass filter), in which:

- 90 ° of phase shifters carry out -90 ° of phase shifts to local oscillation signal, obtain local oscillation signal after phase shift；

A multiplier in two multipliers carries out the input signal of QDM and the multiplying of local oscillation signal；Another The multiplying of local oscillation signal after the input signal and phase shift of multiplier progress QDM；

Two LPF are respectively filtered the output signal of two multipliers；The output signal of two LPF is QDM Output signal.

Certainly, above-mentioned receiver may be the receiver of other forms in the prior art, and the present invention does not limit this It is fixed.

System is corrected using the APD that the embodiment of the present invention 2 provides, it is only necessary to a receiver, compared with the prior art, more It is easily achieved, reduces system cost.

Based on the same inventive concept, the APD correction system provided according to that above embodiment of the present invention, correspondingly, the present invention Embodiment also provides a kind of APD bearing calibration, and flow diagram is as shown in figure 13, specifically includes:

Step 1301 is delayed to system input signal, obtains the time delayed signal of the road N different delayed time, and N is not less than 1 Integer；

Step 1302, according to the system input signal, the time delayed signal and APD coefficient of the road the N different delayed time, obtain power The input signal of amplifier PA；Wherein, which determines in the following way:

It is coupled out a part in the output signal of PA as feedback signal, the gain of the feedback signal is adjusted, is obtained To feedback adjustment signal；Time delayed signal all the way in the time delayed signal of the road N generates feed-forward signal and feedback adjustment as feed-forward signal The error signal of signal；According to the error signal, the APD coefficient is determined.

Optionally, the error signal of feed-forward signal and feedback adjustment signal is generated, that is, carry out feed-forward signal and feedback adjustment The subtraction of signal, obtained signal are the error signal of feed-forward signal and feedback adjustment signal.

In one particular embodiment of the present invention, it according to the error signal, determines the APD coefficient, can specifically include:

According to the power of the error signal, the APD coefficient is determined.

Optionally, it according to the power of the error signal, determines the APD coefficient, can specifically include:

The gain of the error signal is adjusted, error transfer factor signal is obtained；To the average function of the error transfer factor signal Rate is detected, and error power signal is obtained；Analog-to-digital conversion is carried out to the error power signal, obtains error power number letter Number；According to the error power digital signal, the APD coefficient is determined.

In another specific embodiment of the invention, according to the error signal, determines the APD coefficient, specifically can wrap It includes:

Down coversion, analog-to-digital conversion process are carried out to the error signal, obtain error digital signal；Believed according to the error number Number, determine the APD coefficient.

In one particular embodiment of the present invention, APD coefficient includes nonlinear factor and M linear coefficient, 1≤M≤N +1；Step 1302 obtains the input letter of PA according to the system input signal, the time delayed signal and APD coefficient of the road the N different delayed time Number, it can specifically include:

According to the system input signal, the time delayed signal and the nonlinear factor of the road the N different delayed time, generate non-linear pre- Distorted signal；In the road the N+1 signal that the system input signal and the time delayed signal of the road the N different delayed time form, signal is made all the way For center time delayed signal, other roads N signal is as non-central time delayed signal；In the M linear coefficient, M-1 linear coefficient and N The non-central time delayed signal in the non-central road time delayed signal Zhong M-1 in road corresponds；It carries out in the non-central time delayed signal in the road M-1 The multiplying of every road non-central time delayed signal and corresponding linear coefficient；Carry out the non-linear predistortion signal, center delay Signal, M-1 multiplying output signal add operation；In the M linear coefficient, in addition to the M-1 linear coefficient A linear coefficient it is corresponding with the output signal of the add operation；Carry out the output signal of the add operation and corresponding linear system Several multiplyings obtains the input signal of PA.

In another specific embodiment of the invention, which includes nonlinear factor and M linear coefficient, 1≤ M≤N+1；Step 1302 obtains the defeated of PA according to the system input signal, the time delayed signal and APD coefficient of the road the N different delayed time Enter signal, can specifically include:

According to the system input signal, the time delayed signal and the nonlinear factor of the road the N different delayed time, generate non-linear pre- Distorted signal；In the road the N+1 signal that the system input signal and the time delayed signal of the road the N different delayed time form, signal is made all the way For center time delayed signal, other roads N signal is as non-central time delayed signal；In the M linear coefficient, linear coefficient and should Center time delayed signal is corresponding, the non-central non-central time delayed signal in the road time delayed signal Zhong M-1 of other M-1 linear coefficients and the road N It corresponds；Carry out the center time delayed signal and the multiplying of corresponding linear coefficient and the non-central time delayed signal in the road M-1 The multiplying of the road Zhong Mei non-central time delayed signal and corresponding linear coefficient；Carry out the non-linear predistortion signal, M multiplication The add operation of the output signal of operation obtains the input signal of PA.

Preferably, N >=2, center time delayed signal relative to system input signal delay length and PA delay length it Be substantially equal to delay length of the feed-forward signal relative to system input signal.

Step is managed everywhere in above-mentioned process can correspond to the function of corresponding units shown in Fig. 2-Figure 12, no longer superfluous herein It states.

Based on the same inventive concept, the embodiment of the present invention also provides a kind of APD correction system and can wrap as shown in figure 14 Include core cell 1401, gain adjusting unit 1402, error generation unit 1403 and training unit 1404, in which:

Core cell 1401, the APD coefficient exported for receiving system input signal and training unit 1404, according to being Input signal of uniting and APD coefficient, obtain the input signal of power amplifier PA, a part of conduct are coupled out in the output signal of PA Feedback signal；

Gain adjusting unit 1402 is adjusted the gain of the feedback signal, is fed back for receiving feedback signal Adjustment signal, and the feedback adjustment signal is exported to error generation unit 1403；

Error generation unit 1403, for receiving the feedback tune of system input signal and the output of gain adjusting unit 1402 Entire signal, system input signal generates the error signal of feed-forward signal and feedback adjustment signal as feed-forward signal, and exports mistake Difference signal is to training unit 1404；

Training unit 1404, for receiving the error signal of the output of error generation unit 1403, according to the error signal, really Determine APD coefficient, and exports the APD coefficient to core cell 1401.

In one particular embodiment of the present invention, training unit 1404 may refer to Figure 10, including variable gain amplification Device, power detector, analog-digital converter and coefficient training module, in which:

Variable gain amplifier is adjusted for the gain to error signal, obtains error transfer factor signal；

Power detector is detected for the mean power to error transfer factor signal, obtains error power signal；

Analog-digital converter obtains error power digital signal for carrying out analog-to-digital conversion to error power signal；

Coefficient training module, for determining APD coefficient according to error power digital signal.

It is detailed in above-described embodiment 1, this will not be detailed here.

In another specific embodiment of the invention, training unit 1404 may refer to Figure 11, including receiver and be Number training module, in which:

Receiver obtains error digital signal for carrying out down coversion, analog-to-digital conversion process to error signal；

Coefficient training module, for determining APD coefficient according to error digital signal.

It is detailed in above-described embodiment 2, this will not be detailed here.

Further, in APD correction system shown in Figure 14, core cell 1401 has a variety of implementations, such as:

Mode one:

Core cell 1401, as shown in figure 15, including nonlinear block, digital vector modulator and adder, APD coefficient Including nonlinear factor and linear coefficient, in which:

Nonlinear block, for generating non-linear predistortion signal according to system input signal and nonlinear factor；

Adder carries out the add operation of non-linear predistortion signal, system input signal；

Digital vector modulator carries out the output signal of adder and the multiplying of linear coefficient, obtains the input letter of PA Number.

Mode two:

Core cell 1401, including nonlinear block, digital vector modulator and adder, APD coefficient include non-linear Coefficient and linear coefficient, in which:

Digital vector modulator carries out the multiplying of system input signal and linear coefficient；

Adder carries out the add operation of the output signal of non-linear predistortion signal, digital vector modulator, obtains PA Input signal.

The specific implementation of aforesaid way one and the core cell of mode two 1401 may refer to above, and this will not be detailed here.

Optionally, in APD correction system shown in Figure 14, gain adjusting unit 1402 can be realized by VGA.

Optionally, in APD correction system shown in Figure 14, error generation unit 1403 can be realized that this subtracts by subtracter Musical instruments used in a Buddhist or Taoist mass carries out the subtraction of feed-forward signal and feedback adjustment signal to be believed to get to the error of feed-forward signal and feedback adjustment signal Number.

Based on the same inventive concept, the APD correction system provided according to that above embodiment of the present invention, correspondingly, the present invention Embodiment also provides a kind of APD bearing calibration, and flow diagram is as shown in figure 16, specifically includes:

A part is coupled out in step 1601, the output signal of power amplifier PA as feedback signal, to the feedback letter Number gain be adjusted, obtain feedback adjustment signal；

Step 1602, system input signal generate the mistake of the feed-forward signal He the feedback adjustment signal as feed-forward signal Difference signal；

Step 1603, according to the error signal, determine the APD coefficient；

Step 1604, according to the system input signal and the APD coefficient, obtain the input signal of PA.

Wherein, step 1602 generates the error signal of feed-forward signal and feedback adjustment signal, that is, carries out feed-forward signal and anti- The subtraction of adjustment signal is presented, obtained signal is the error signal of feed-forward signal and feedback adjustment signal.

In one particular embodiment of the present invention, step 1603 determines the APD coefficient, specifically according to the error signal May include:

In another specific embodiment of the invention, step 1603 determines the APD coefficient according to the error signal, tool Body may include:

In one particular embodiment of the present invention, APD coefficient includes nonlinear factor and linear coefficient；Step 1604 piece According to the system input signal and the APD coefficient, the input signal of PA is obtained, can specifically include:

According to the system input signal and the nonlinear factor, non-linear predistortion signal is generated；It is non-linear pre- to carry out this The add operation of distorted signal, the system input signal；Carry out the output signal of the add operation and the multiplication of the linear coefficient Operation obtains the input signal of PA.

In another specific embodiment of the invention, APD coefficient includes nonlinear factor and linear coefficient；Step 1604, according to the system input signal and the APD coefficient, the input signal of PA is obtained, can specifically include:

According to the system input signal and the nonlinear factor, non-linear predistortion signal is generated；Carry out the system input The multiplying of signal and the linear coefficient；Carry out the non-linear predistortion signal, the multiplying output signal addition Operation obtains the input signal of PA.

Step is managed everywhere in above-mentioned process can correspond to the function of corresponding units shown in Figure 14-Figure 15, no longer superfluous herein It states.

In conclusion using APD correcting scheme provided in an embodiment of the present invention, it is easier to realize, cost is lower.

It is understood that as an alternative embodiment, in system above, the coefficient training module of training unit Digital circuit (including optional part AGC) can be used, and other parts are realized using analog circuit.

The APD correcting scheme provided in any of the above one embodiment can be applied to mobile communication system, wireless transmission System or radar system etc. need to carry out in the system of APD.Specifically, APD correcting scheme can be, but not limited to be applied to move In base station in dynamic communication system.

The embodiment of the present invention also provides a kind of base station, including a kind of APD of any of the above corrects system.

In a base station, the system input signal of system is corrected using the signal to be transmitted for needing to carry out power amplification as APD, APD corrects the input signal that system generates PA, since APD correction system corrects the PA distortion generated, so that PA Output signal is undistorted relative to system input signal, i.e., the signal to be transmitted after power amplification is undistorted, ensure that communication matter Amount.

It should be understood by those skilled in the art that, the embodiment of the present invention can provide as method, system or computer program Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the present invention Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the present invention, which can be used in one or more, The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces The form of product.

The present invention be referring to according to the method for the embodiment of the present invention, the process of equipment (system) and computer program product Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates, Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or The function of being specified in multiple boxes.

These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one The step of function of being specified in a box or multiple boxes.

Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as It selects embodiment and falls into all change and modification of the scope of the invention.

Obviously, those skilled in the art can carry out various modification and variations without departing from this hair to the embodiment of the present invention The spirit and scope of bright embodiment.In this way, if these modifications and variations of the embodiment of the present invention belong to the claims in the present invention And its within the scope of equivalent technologies, then the present invention is also intended to include these modifications and variations.

Claims

1. a kind of analog predistortion APD corrects system, which is characterized in that generated including core cell, gain adjusting unit, error Unit and training unit, in which:

The core cell, for receiving the APD coefficient of system input signal and training unit output；To the system Input signal is delayed, and obtains the time delayed signal of the road N different delayed time, wherein all the way time delayed signal as feed-forward signal export to The error generation unit, N are the integer not less than 1；And according to the system input signal, the road N different delayed time Time delayed signal and the APD coefficient, obtain the input signal of power amplifier PA, a part of work are coupled out in the output signal of PA For feedback signal；

The gain adjusting unit is adjusted the gain of the feedback signal for receiving the feedback signal, obtains anti- Adjustment signal is presented, and exports the feedback adjustment signal to the error generation unit；

The error generation unit, the feed-forward signal and the gain adjusting unit for receiving the core cell output are defeated Feedback adjustment signal out, generates the error signal of the feed-forward signal and the feedback adjustment signal, and exports the error Signal is to the training unit；

The training unit, the error signal for receiving the error generation unit output are determined according to the error signal The APD coefficient, and the APD coefficient is exported to the core cell.

2. the system as claimed in claim 1, which is characterized in that the training unit, including the inspection of variable gain amplifier, power Survey device, analog-digital converter and coefficient training module, in which:

The analog-digital converter obtains error power digital signal for carrying out analog-to-digital conversion to the error power signal；

3. the system as claimed in claim 1, which is characterized in that the training unit, including receiver and coefficient training module, Wherein:

The receiver obtains error digital signal for carrying out down coversion, analog-to-digital conversion process to the error signal；

4. system a method according to any one of claims 1-3, which is characterized in that the core cell, including it is N number of delayer, non-thread Property module, M digital vector modulator and adder, the APD coefficient include nonlinear factor and M linear coefficient, 1≤M ≤ N+1, in which:

N number of delayer series connection obtains the delay letter of the road N different delayed time for being delayed to the system input signal Number；

The nonlinear block, for according to the time delayed signal of the system input signal, the road N different delayed time and described non- Linear coefficient generates non-linear predistortion signal；

Described M digital vector modulator, one of digital vector modulator is as rear digital vector modulator, other M-1 A number vector modulator is as preceding digital vector modulator；The delay of the system input signal and the road N different delayed time In the road the N+1 signal of signal composition, time delayed signal centered on signal all the way, other roads N signal is as non-central time delayed signal； In the M linear coefficient, the output signal of a linear coefficient and the adder is corresponding, other M-1 linear coefficients and N The non-central time delayed signal in the non-central road time delayed signal Zhong M-1 in road corresponds；Described in digital vector modulator carries out before each The multiplying of non-central all the way time delayed signal and corresponding linear coefficient in the non-central time delayed signal in the road M-1；

The adder, digital vector modulation before carrying out the non-linear predistortion signal, the center time delayed signal, M-1 The add operation of the output signal of device；

Digital vector modulator carries out the output signal of the adder and the multiplying of corresponding linear coefficient after described, obtains The input signal of PA.

5. system a method according to any one of claims 1-3, which is characterized in that the core cell, including it is N number of delayer, non-thread Property module, M digital vector modulator and adder, the APD coefficient include nonlinear factor and M linear coefficient, 1≤M ≤ N+1, in which:

The M digital vector modulator, digital vector modulator centered on one of digital vector modulator, other M- 1 digital vector modulator is as non-central digital vector modulator；The system input signal and the road N different delayed time In the road the N+1 signal of time delayed signal composition, time delayed signal centered on signal all the way, other roads N signal is as non-central delay Signal；In the M linear coefficient, a linear coefficient and the center time delayed signal are corresponding, other M-1 linear coefficients with The non-central time delayed signal in the non-central road time delayed signal Zhong M-1 in the road N corresponds；The center number vector modulator carries out institute The multiplying of center time delayed signal with corresponding linear coefficient is stated, each non-central digital vector modulator carries out the road M-1 The multiplying of non-central all the way time delayed signal and corresponding linear coefficient in non-central time delayed signal；

The adder carries out the addition of the output signal of the non-linear predistortion signal, the M digital vector modulator Operation obtains the input signal of PA.

6. a kind of analog predistortion APD bearing calibration characterized by comprising

According to the system input signal, the time delayed signal and APD coefficient of the road N different delayed time, power amplifier PA is obtained Input signal；Wherein, the APD coefficient determines in the following way:

It is coupled out a part in the output signal of PA as feedback signal, the gain of the feedback signal is adjusted, is obtained Feedback adjustment signal；Time delayed signal all the way in the time delayed signal of the road N generates the feed-forward signal and institute as feed-forward signal State the error signal of feedback adjustment signal；According to the error signal, the APD coefficient is determined.

7. method as claimed in claim 6, which is characterized in that according to the error signal, determine the APD coefficient, specifically Include:

According to the error power digital signal, the APD coefficient is determined.

8. method as claimed in claim 6, which is characterized in that according to the error signal, determine the APD coefficient, specifically Include:

According to the error digital signal, the APD coefficient is determined.

9. such as method as claimed in claim 6 to 8, which is characterized in that the APD coefficient includes nonlinear factor and M line Property coefficient, 1≤M≤N+1；

According to the system input signal, the time delayed signal and APD coefficient of the road N different delayed time, the input signal of PA is obtained, It specifically includes:

According to the system input signal, the time delayed signal and the nonlinear factor of the road N different delayed time, generate non-linear Pre-distorted signals；

In the road the N+1 signal of the system input signal and the time delayed signal of the road N different delayed time composition, signal conduct all the way Center time delayed signal, other roads N signal is as non-central time delayed signal；In the M linear coefficient, M-1 linear coefficient and N The non-central time delayed signal in the non-central road time delayed signal Zhong M-1 in road corresponds；It carries out in the non-central time delayed signal in the road M-1 Every road non-central time delayed signal and corresponding linear coefficient multiplying；

Carry out the non-linear predistortion signal, the center time delayed signal, M-1 multiplying output signal addition fortune It calculates；

In the M linear coefficient, a linear coefficient and the add operation in addition to the M-1 linear coefficient it is defeated Signal is corresponding out；The output signal of the add operation is carried out with the multiplying of corresponding linear coefficient, the input for obtaining PA is believed Number.

10. such as method as claimed in claim 6 to 8, which is characterized in that the APD coefficient includes nonlinear factor and M Linear coefficient, 1≤M≤N+1；

In the road the N+1 signal of the system input signal and the time delayed signal of the road N different delayed time composition, signal conduct all the way Center time delayed signal, other roads N signal is as non-central time delayed signal；In the M linear coefficient, a linear coefficient and institute It is corresponding to state center time delayed signal, the non-central delay letter in the non-central road time delayed signal Zhong M-1 of other M-1 linear coefficients and the road N Number correspond；It carries out the center time delayed signal and the multiplying of corresponding linear coefficient and the road M-1 is non-central prolongs When the road signal Zhong Mei non-central time delayed signal and corresponding linear coefficient multiplying；

Carry out the non-linear predistortion signal, M multiplying output signal add operation, obtain the input letter of PA Number.

11. a kind of analog predistortion APD corrects system, which is characterized in that raw including core cell, gain adjusting unit, error At unit and training unit, in which:

The core cell, for receiving the APD coefficient of system input signal and training unit output, according to the system Input signal of uniting and the APD coefficient, obtain the input signal of power amplifier PA, are coupled out a part in the output signal of PA As feedback signal；

The error generation unit, for receiving the feedback tune of the system input signal and gain adjusting unit output Entire signal, the system input signal generate the error of the feed-forward signal and the feedback adjustment signal as feed-forward signal Signal, and the error signal is exported to the training unit；

12. system as claimed in claim 11, which is characterized in that the training unit, including variable gain amplifier, power Detector, analog-digital converter and coefficient training module, in which:

13. system as claimed in claim 11, which is characterized in that the training unit, including receiver and coefficient training mould Block, in which:

14. the system as described in claim 11-13 is any, which is characterized in that the core cell, including nonlinear block, Digital vector modulator and adder, the APD coefficient includes nonlinear factor and linear coefficient, in which:

The nonlinear block, for generating non-linear predistortion according to the system input signal and the nonlinear factor Signal；

The digital vector modulator carries out the output signal of the adder and the multiplying of the linear coefficient, obtains PA Input signal.

15. the system as described in claim 11-13 is any, which is characterized in that the core cell, including nonlinear block, Digital vector modulator and adder, the APD coefficient includes nonlinear factor and linear coefficient, in which:

The adder carries out the addition fortune of the output signal of the non-linear predistortion signal, the digital vector modulator It calculates, obtains the input signal of PA.

16. a kind of analog predistortion APD bearing calibration characterized by comprising

It is coupled out a part in the output signal of power amplifier PA as feedback signal, the gain of the feedback signal is carried out Adjustment, obtains feedback adjustment signal；

System input signal generates the error signal of the feed-forward signal and the feedback adjustment signal as feed-forward signal；

According to the error signal, the APD coefficient is determined；

17. the method described in claim 16, which is characterized in that according to the error signal, determine the APD coefficient, have Body includes:

According to the error power digital signal, the APD coefficient is determined.

18. the method described in claim 16, which is characterized in that according to the error signal, determine the APD coefficient, have Body includes:

According to the error digital signal, the APD coefficient is determined.

19. the method as described in claim 16-18 is any, which is characterized in that the APD coefficient includes nonlinear factor and line Property coefficient；

20. the method as described in claim 16-18 is any, which is characterized in that the APD coefficient includes nonlinear factor and line Property coefficient；

Carry out the non-linear predistortion signal, the multiplying output signal add operation, obtain PA input letter Number.