WO2012059068A1

WO2012059068A1 - Method, device and communication system for correcting polar transmitter delay skew

Info

Publication number: WO2012059068A1
Application number: PCT/CN2011/081790
Authority: WO
Inventors: 殷为民; 张希坤; 何松柏; 胡世飞
Original assignee: 华为技术有限公司
Priority date: 2010-11-04
Filing date: 2011-11-04
Publication date: 2012-05-10
Also published as: CN102143097A; CN102143097B

Abstract

Provided is a method, device and communication system for correcting polar transmitter delay skew. The method comprises: generating the error vector magnitude (EVM) of a polar transmitter output signal; obtaining the time skew value needed to be compensated according to the EVM and the functional relationship between the EVM and the delay skew of the envelope branch and the phase branch of the polar transmitter; and compensating the delay skew for the envelope branch and/or the phase branch of the polar transmitter according to the time skew value needed to be compensated. The method has a wide range of applications, is simple and is easy to implement. Because EVM is very sensitive to delay skew and there exists a functional relationship between EVM and delay skew, the calculated delay skew can achieve a very high degree of test precision.

Description

Method, device and communication system for correcting the delay difference of a polar coordinate transmitter. The present application claims a method for correcting the time difference of a polar coordinate transmitter, which is filed on November 4, 2010, with the application number of 201010533000.X. The priority of the Chinese Patent Application for the Device and the Communication System, the entire contents of which is incorporated herein by reference. Technical field

The present invention relates to the field of communication technologies, and in particular, to a method, apparatus and communication system for correcting a delay difference of a polar coordinate transmitter. Background technique

With the development of communication technology, the bandwidth of wireless transmission signals is increasing and the peak-to-average ratio is gradually increasing, which poses severe requirements for the efficiency and linearity of the transmitter. The current transmitter structure is generally based on Class AB power amplifiers combined with linearization techniques. It satisfies the linearity while sacrificing the efficiency of the transmitter and does not solve this contradiction well. The polar transmitter is evolved from the EER (Envelope Elimination and Restoration) structure, which can effectively solve the contradiction by satisfying the linearity while considering the transmitter efficiency.

Figure 1 is a schematic block diagram of a polar transmitter. As shown in Fig. 1: First, the baseband complex signal S _1(t ) is divided into a variable envelope amplitude signal p(t) and a constant envelope phase signal _e ^w) by amplitude phase separation:

S ₁ (t) = r(t) + j * X(t) ( 1 ) p(t) = ^ ² (t) + x ² (t) (2)

G(t) = tan ¹ ^ ( 3 )

r(t)

The polar coordinate representation of the signal after amplitude phase separation is:

S. (t) = _p (t).Re(e ^j9(t) ) (4)

The phase signal _e J ^e(t ) is phase-modulated up-converted to the radio frequency constant envelope signal _e J( ^e ( ^{t )+c} ^) and then sent to the gate of the switching power amplifier, where ω. For the RF carrier signal frequency; the variable envelope amplitude signal _Ρ ω is used as a control signal, which is sent to the drain of the switching power amplifier, and the drain modulation effect of the switching power amplifier is used. The bit-modulated constant envelope phase signal _e J ^{Wt) +} ^ is amplitude modulated to obtain an output signal S. ), the purpose of upconverting the baseband complex signal S _1(t ) to the radio frequency domain and amplifying is achieved.

S ₀ (t) = p(t).Re(e ^{j(e(t)+3⁄4 t)} )

= p(t).cos(e(t) + co _c .t) (5 )

= r(t).cos(ro _c t) + jx(t).sin(ro _c t) The switching power amplifier of the polar transmitter is a high-efficiency power amplifier, which guarantees the efficiency of the system; after the previous amplitude and phase separation The input power amplifier is a constant envelope signal, and there is no problem that the amplifier will be distorted after amplification, which ensures the linearity of the system. In short: The efficiency of the system is guaranteed by the switch-type power amplifier, and the linearity of the system is due to the separation of amplitude and phase.

This design of the polar transmitter makes it possible to simultaneously consider the efficiency and linearity of the system, and is suitable for the future development of communication, and thus has received extensive attention. However, the envelope information and the phase information have experienced different amplification channels, and the respective delays are different. There is a delay in the synthesis of the final switching power amplifier, which is an inherent defect of the polar coordinate transmitter. The existence of envelope and phase delay difference will seriously affect the quality of the synthesized signal, making the signal out-of-band spectrum proliferate, error vector magnitude

(EVM, Error Vector Magnitude) is increased, so the corresponding correction method must be taken.

However, the existing methods for correcting the delay difference mostly estimate the delay difference between the envelope and the phase branch based on some statistical characteristics of the input and output signals (such as covariance, mean, quadratic distance, etc.). , the error is large. Summary of the invention

The invention provides a method, a device and a communication system for correcting the delay of the polar coordinate transmitter from different aspects to obtain and correct the delay difference, so as to solve the defects of the prior art correction method which is complicated and large in error.

An aspect of the present invention provides a method for correcting a delay difference of a polar coordinate transmitter, the method comprising: generating an error vector magnitude EVM of a polar coordinate transmitter output signal; according to an envelope branch of the polar transmitter a functional relationship between the delay difference r of the phase leg and the EVM and the EVM, obtaining a delay difference that needs to be compensated; and the pole sitting according to the delay difference that needs to be compensated The envelope branch of the target transmitter and/or the phase branch compensates for the delay.

Another aspect of the present invention provides an apparatus for correcting a delay difference of a polar coordinate transmitter, the apparatus comprising: an EVM generating unit for generating an error vector magnitude EVM of a polar coordinate transmitter output signal; a delay difference obtaining unit Connecting the EVM generating unit, configured to obtain a time required for compensation according to a functional relationship between the delay difference r of the envelope branch and the phase leg of the polar coordinate transmitter and the EVM, and the EVM The delay unit is configured to delay the envelope of the polar transmitter and/or the phase branch according to the delay difference that needs to be compensated.

A still further aspect of the present invention provides a communication system, the communication system comprising: a polar coordinate transmitter and a device for correcting a polar coordinate transmitter delay difference provided by the foregoing embodiment, the polar coordinate transmitter and the correction Forming a closed loop connection between the devices of the polar transmitter delay difference; the closed loop connection comprises: the EVM generating unit connecting an output of the polar transmitter; the delay unit connecting the polar transmitter Input. The method, the device and the system provided by the invention have wide application range and are easy to implement. Since the EVM is sensitive to the delay difference, and there is a functional relationship between the EVM and the delay difference, the obtained delay difference T can be higher. Precision. DRAWINGS

1 is a schematic block diagram of a prior art polar coordinate transmitter;

2 is a diagram showing a relationship between an output signal EVM and a delay difference τ according to an embodiment of the present invention; FIG. 3 is a flowchart of a method for correcting a transmitter delay difference by using an EVM value according to an embodiment of the present invention; The function block diagram 4a of the device 60 for correcting the transmitter delay difference using the EVM value is a detailed functional block diagram of the delay difference acquisition unit 602 in the device 60;

FIG. 5 is a diagram showing a system connection relationship for correcting transmitter delay difference by using EVM value according to an embodiment of the present invention;

6 is a detailed principle of a system for correcting a transmitter delay difference by using an EVM value according to an embodiment of the present invention; Figure. Concrete implementation

Embodiments of the present invention provide a method, apparatus, and communication system for correcting a delay difference of a polar coordinate transmitter. The technical solution is based on a function of an error vector magnitude EVM value of an output signal and a delay difference r and an EVM value of the output signal. The delay difference r is obtained, and the delay in at least one of the branches is adjusted to achieve the purpose of envelope and phase synchronization.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The realization of the technical solution of the present invention is as follows: Through simulation, it is found that the delay difference between the polar coordinate transmitter envelope and the phase branch is a function of the influence of the delay difference on the output signal EVM. The function relationship can be a linear relationship; in this functional relationship, the EVM can also have a minimum value.

The function relationship obtained by the simulation in this embodiment is as follows. Let the delay of the envelope branch be ^, and the delay of the phase branch be Δ ₂ , then the EVM of the output signal is:

EVM -^ = y?- | (A ₁ -A ₂ ) |= y?- | r | (9)

In the formula, the influence of various non-ideal factors other than the delay difference on the EVM in the transmitter can be obtained experimentally or by simulation. It can be understood that ^ can be 0 in the theoretical case. = - indicates the delay difference between the two branches, ^ is the constant coefficient, which is related to the modulation mode of the signal, the chip rate, and so on. The values are different for the signals, but for each signal, the value of ^ is uniquely fixed. The difference in signal here may include, but is not limited to, a modulation scheme of the signal or a different chip rate.

Taking the WCDMA (Wideband Code Division Multiple Access) signal as an example, the relationship between the EVM and the delay difference τ of the output signal is shown in Fig. 2. In this embodiment, the delay difference τ is the difference between the envelope branch delay and the phase branch delay. From Figure 2, we can see the delay. The difference has a linear effect on the EVM of the output signal. It can also be seen from Figure 2 that there is a minimum value of EVM in the linear relationship between EVM and r.

Based on the above simulation results, the embodiment of the present invention first provides a method for correcting the delay of the polar transmitter, and uses the EVM value to correct the delay difference of the transmitter. Figure 3 is a schematic flow diagram of the method. As shown in Figure 3, the method includes:

5301, generating an error vector magnitude EVM of the polar coordinate transmitter output signal;

S302: Obtain a delay difference that needs to be compensated according to a functional relationship between the delay difference r between the envelope branch and the phase leg of the polar coordinate transmitter and the EVM, and the EVM.

S303: Perform delay compensation on the envelope branch of the polar transmitter and/or the phase branch according to the delay difference that needs to be compensated.

Optionally, a functional relationship between the delay difference r and the EVM is that the EVM is proportional to an absolute value of the r, or the EVM has a minimum value.

Optionally, a functional relationship between the delay difference r and the EVM is that the EVM is proportional to an absolute value of the r, where a proportional factor is a constant coefficient; S302 specifically includes: according to the proportional ratio The factor and the EVM, obtain the delay difference that needs to be compensated.

Optionally, the EVM is proportional to the absolute value of the r: EVM -77 = | r | ; S302 specifically includes: obtaining a delay difference r that needs to be compensated according to the generated EVM value and the obtained sum. Wherein, the influence of the factors other than the delay difference on the EVM in the polar transmitter is a constant coefficient related to the characteristics of the signal itself; it can be understood that ^ can be 0 in the theoretical case.

Optionally, a correspondence list between the EVM and the ^ is obtained according to a functional relationship between the delay difference r and the EVM, and the delay difference r that needs to be compensated can also be obtained by looking up the table.

Optionally, the function relationship between the delay difference r and the EVM is that the EVM has a minimum value; S302 and S303 include delay difference correction by delaying the EVM to a minimum value by successively compensating for the delay difference. The S302 may specifically include: in the process of acquiring the EVM minimum value by using the successive compensation, obtaining the delay of the compensation required for the nth compensation according to the change value of the EVM caused by the n-1th compensation The increment Δτ(η), the absolute value ΔΔτ(η) of Δτ(η) decreases as the number of compensations increases; S303 specifically includes: the polar transmitter according to the initial value of the set delay difference The initial branch delay compensation is performed by the envelope branch and/or the phase branch; after the η-1th compensation, the delay difference increment Δτ(η) of the acquired ηth complement compensation is used. The envelope branch of the polar transmitter and/or the phase leg are time-delay compensated.

Optionally, in S302, in the process of acquiring the EVM minimum value by using the successive compensation, the delay difference amount Δτ of the compensation required for the nth compensation is obtained according to the change value of the EVM caused by the first compensation. (η) includes: setting the initial value of the delay difference ΔΓ(0); iterating with -(n) = -sign[EVM(n) - EVM(n-1)] *Δτ(η - 1)] *k, Obtaining a delay difference increment value Δτ(η) for the compensation required for the nth compensation according to the set initial value of the delay difference and the EVM value; wherein ΔΓ(η) = ΔΓ(η + 1)−ΔΓ( η), sign[EVM(n)-EVM(n

[k<l EVM(n)-EVM(n-l)>0

k is defined as k < l EVM(n) - EVM(n-1) = 0.

k = l EVM(n)-EVM(n-l)<0 Optionally, if the change value of the EVM caused by the n-1th compensation is less than the preset minimum value, the delay compensation is completed.

The detailed process of compensating for the delay difference using the differential iteration method will be explained later in describing the working principle of the system.

Optionally, the function of the delay difference r and the EVM is that the EVM has a minimum value; S303 includes performing delay difference correction by delaying the EVM to a minimum value by successively compensating for the delay difference. Obtaining the delay difference ^ in one embodiment can also be obtained by searching, for example, the known maximum delay difference is within the interval [D_min D_max], so that τ starts from 0_1^11, and each time a new one is added. Small value (set to Δτ _1), when τ is increased from 0_1^11 to D_max, EVM also τ _minl), then the true delay difference should be around τ _minl. Then start the second search, this time narrow the search interval to around τ _min (for example, set to [τ — minl-ADl τ — minl+ADl] ), and also reduce the step of T (set to Δ τ _2 , Δ τ — 2 < Δτ — 1 ), which can improve the accuracy of the final delay difference and obtain the Τ value (set to T _min2) that minimizes the EVM. In order to improve the accuracy of the delay difference, the third, fourth, ... Nth search can be performed next, and each search is continuously narrowed down, and the step can be reduced to finally obtain the desired accurate delay difference. T

_minN. In this way, the delay difference r of the required compensation is obtained by means of successive compensation, and the compensation correction of the delay difference is completed. It can be understood that the search method listed here is only an example, and other search methods may be used according to the functional relationship between the delay difference r and the EVM, which may not be limited herein.

Corresponding to the method of FIG. 3, an embodiment of the present invention further provides a device for correcting a delay difference of a polar coordinate transmitter, and FIG. 4 is a functional block diagram of a device 40 for correcting a delay difference of a polar coordinate transmitter according to an embodiment of the present invention. As shown in FIG. 4, the apparatus 40 of this embodiment includes: an EVM generating unit 401, configured to generate an error vector magnitude EVM of a polar coordinate transmitter output signal; a delay difference obtaining unit 402, connected to the EVM generating unit, for Obtaining a delay difference that needs to be compensated according to a functional relationship between the delay difference r of the envelope branch and the phase branch of the polar transmitter and the EVM and the EVM; a delay unit 403, configured to Delay compensation is performed on the envelope branch of the polar transmitter and/or the phase leg according to the delay difference that needs to be compensated.

Optionally, a functional relationship between the delay difference r and the EVM may be a minimum value of the EVM, or the EVM is proportional to an absolute value of the r.

Optionally, the functional relationship between the delay difference r and the EVM is that the EVM is proportional to the absolute value of the r, wherein the proportional factor is a constant coefficient; the delay difference obtaining unit 402 And for obtaining a delay difference that needs to be compensated according to the proportional factor and the EVM.

Optionally, the EVM is proportional to the absolute value of the r: EVM -77 = l; the delay difference obtaining unit 402 is specifically configured to: according to the generated EVM value; and obtain a delay that requires compensation Poor r. Wherein; represents the other factors in the polar transmitter except for the delay difference The amount of influence of the EVM is a constant coefficient related to the characteristics of the signal itself; it can be understood that, in theory, it can be zero.

Optionally, the delay difference obtaining unit 402 may include: a simulation unit, configured to obtain, by using a simulation method, a functional relationship between the delay difference r and the EVM.

Optionally, the function of the delay difference r and the EVM is a minimum value of the EVM; the delay difference obtaining unit 402 is specifically configured to acquire the EVM minimum value by using successive compensation. According to the change value of the EVM caused by the n-1th compensation, the delay difference increment Δτ(η) of the compensation required for the nth compensation is obtained, and the absolute value ΔΔτ(η) of Δτ(η) The delay unit 403 is specifically configured to initialize an envelope branch of the polar transmitter and/or the phase branch according to an initial value of the set delay difference. Delay compensation, and after the n-1th compensation, the delay difference delta Δτ(η) of the acquired compensation required for the nth compensation is applied to the envelope branch of the polar transmitter and/or The phase branch performs delay compensation.

Optionally, the delay unit 403 is further configured to end delay compensation when the change value of the EVM caused by the n-1th compensation is less than a preset minimum value.

4a is a detailed functional block diagram of the delay difference acquisition unit. As shown in FIG. 6a, the delay difference acquisition unit 402 includes an initial setting unit 4021 for setting an initial delay value ΔΓ (0). Incremental generation unit 4022, using r(n + 1) = r(n) - sign[EVM (n) - EVM (n-1)]* [r(n) - r(n-1)] * k is iterated, and according to the set initial value of the delay difference and the generated EVM value, the delay difference increment Δτ(η) for each compensation is obtained _; wherein ΔΓ(η) = ΔΓ(η + 1)− ΔΓ( η),

1 EVM(n)-EVM(n-l)>0

Sign[EVM(n)-EVM(n 0 EVM(n)-EVM(n-l) = 0,

— 1 EVM(n)-EVM(n-l)<0 k<l EVM(n)-EVM(n-l)>0

k is defined as k<l EVM(n)— EVM(n-1) = 0.

k = l EVM(n) - EVM(nl) < 0 corresponds to the method of FIG. 3 and the apparatus of FIG. 4 and FIG. 4a, and an embodiment of the present invention provides a pass. Letter system, FIG. 5 is a schematic diagram of a connection relationship of a system according to an embodiment of the present invention. As shown in FIG. 5, the system includes: a device 40 for correcting the polar transmitter delay difference shown in FIG. 6, and a polar transmitter 50, which form a closed loop connection. The closed loop connection includes: the EVM generating unit 401, connected to an output of the polar transmitter; the delay unit 403, connecting an input of the polar transmitter

Optionally, as shown in FIG. 5, the system further includes: a down conversion unit 60, connected to the output of the polar transmitter and the EVM generating unit, for transmitting the polar coordinates of the downconversion process The output signal of the machine is provided to the EVM unit.

Figure 6 is a detailed schematic diagram of a system in accordance with an embodiment of the present invention. The differential iteration method is taken as an example to describe in detail the working principle of the corrected polar coordinate transmitter delay difference provided in the embodiment of the present invention.

Since the _EVM has a minimum value in the function relationship between the EVM and the τ obtained by the simulation in the embodiment of the present invention, the embodiment of the present invention can use the differential method iteration to obtain the EVM minimum value by successive approximation to compensate the actual delay difference. Ground, the basic principle of this correction method is:

Let n), ^ ⁿ ) be the envelope and phase information of the transmitted signal respectively, and the delays of the polar transmitter envelope branch and the phase branch are respectively ^, and then the output signal is down-converted to obtain the feedback packet. The network and phase signals are ^ ^η ), ^ ^η ), respectively.

The EVM is calculated from the transmitted signal ^ ^η ) ( ^η ) and the feedback signal ^ ¹¹ )^ ¹¹ ):

Where A(k) = (n is the transmitted signal, which is the vector error, is derived from the transmitted signal η), ί η) and the feedback signal ^ ί^η), where ^ is the data length of the EVM.

The manner of obtaining the EVM given here is only an example, and other methods may be obtained, which may not be limited herein.

Set the delay difference initial values ΔΓ(0), r(0) and r(l) corresponding to the output of EVM EVM(0), EVM(l), that is, the value of EVM corresponding to Δτ(0) before compensation is EVM(0), corresponding to 补偿 after compensation

The value of EVM is EMV(l), and the iteration of delay difference is performed according to the following formula:

r(n + 1) = r(n) - sign[EVM(n) - E\M(n - 1)] * [r(n) - r(n - 1)] * k ( 12)

: Medium, Δτ(η) = Δτ(η + 1) - ΔΓ( II) sign( ) is a sign function.

1 EVM(n)-EVM(n-l)>0

Sign[EVM(n)-EVM(n 0 EVM(n)-EVM(n-l) = 0

— 1 EVM(n)-EVM(n-l)<0

(13)

The definition of k is as follows:

k<l EVM(n)-EVM(n-l)>0

k<l EVM(n)-EVM(n-l) = 0

k = l EVM(n)-EVM(n-l)<0 The formula 12 is slightly deformed to obtain:

r(n + 1)— r(n) = -sign[EVM(n) - EVM(n - 1)] * [r(n) - r(n - 1)] * k ( 14), set the current time For T(n), Δτ(η) = r(n + l)-r(n), which represents the amount of change when the next time T(n+1) arrives. ΔΓ(η— l)=r(n)— r^i −1 represents the amount of change of f compared to the previous time T(nl), AEVM(nl) = EVM(n)-EVM(nl) The amount of change in T(nl) at a time compared to EVM.

Then formula 12 can be written as:

△r(n + 1) = -sign[AE\M(n)] * Δτ(η) * k (15)

It can be seen from this formula:

If the current time delay difference increases by Δτ(η), the EVM is reduced, that is, AEVM(n)<0, then - sign[AEVM(n)] =1, k=l, the next time Δτ(η+1 ) As with Δτ(η), the EVM continues to decrease.

If the current time delay difference increases by Δτ(η), the EVM is increased, that is, AEVM(n)>0, indicating that the direction of change of the increment Δτ(η) is reversed, then - sign[AEVM(n)] = - 1, k < l, the next time Δτ(η+1) is opposite to Δτ(η), and the absolute value of ΔΓ is decreased, so that EVM is also reduced.

Referring to Fig. 2, it can be seen that after a plurality of compensations of Δτ(η), the minimum value of the EVM is successively approximated. After several iterations of the algorithm, the EVM will converge to a minimum value, which can be considered as an envelope.

-IO- The phase has reached synchronization.

In summary, according to the relationship between the output signal EVM and the delay difference, the embodiment of the present invention obtains the delay difference of each compensation by using the EVM minimum value by multiple iterations, and can add corresponding phase in the phase branch. The compensation forms a closed loop correction scheme. After multiple compensations, the envelope is synchronized with the phase branch.

It should be noted that, although the specific example is to compensate the phase branch, in practical applications, the envelope branch may be compensated, or the phase branch and the envelope branch may be compensated at the same time, as long as It is a variant that the delay difference is obtained according to the EVM value, and at least one of the two branches is compensated according to the delay difference, and all other technical solutions that finally realize the synchronization of the two branches are within the protection scope of the claim of the present invention. .

According to the simulation, the EVM of the output signal is a function of the delay difference, and the EVM minimum value of the output signal is obtained by multiple iterations to obtain the delay difference of the transmitter, and the envelope or phase branch is obtained. The delay unit is added to compensate on the road. Since EVM is very sensitive to delay difference, and there is a functional relationship between EVM and delay difference, the calculated delay difference can achieve higher test accuracy (can reach nanosecond level). Wide, simple, easy to implement.

A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. In execution, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM). The above embodiments are only used to explain the technical solutions of the embodiments of the present invention, and are not limited thereto; although the embodiments of the present invention are described in detail with reference to the foregoing embodiments, those skilled in the art should understand that The technical solutions described in the embodiments are modified, or the equivalents of the technical features are replaced by the equivalents. The modifications and substitutions of the embodiments do not depart from the spirit and scope of the technical solutions of the embodiments of the embodiments of the present invention.

Claims

Rights request

A method for correcting a delay difference of a polar coordinate transmitter, the method comprising: generating an error vector magnitude EVM of a polar coordinate transmitter output signal;

Obtaining a delay difference that needs to be compensated according to a functional relationship between the delay difference r of the envelope branch and the phase branch of the polar transmitter and the EVM and the EVM;

Delay compensation is performed on the envelope branch of the polar transmitter and/or the phase leg according to the delay difference that needs to be compensated.

The method according to claim 1, wherein a functional relationship between the delay difference r and the EVM is that the EVM is proportional to an absolute value of the r, or the EVM There is a minimum value.

3. Method according to claim 1 or 2, characterized in that said EVM is proportional to the absolute value of said r: EVM - / 7 = | r | _; wherein: represents said polar transmitter The amount of influence of the factors other than the delay difference on the EVM is a constant coefficient related to the characteristics of the signal itself; according to the delay difference r between the envelope branch and the phase branch of the polar transmitter and the EVM The relationship between the function and the EVM, obtaining the delay difference that needs to be compensated includes: obtaining the delay difference that needs to be compensated according to the EVM value;

The method according to claim 1 or 2, wherein the function relationship between the delay difference r and the EVM is that the EVM has a minimum value;

And obtaining, according to a functional relationship between the delay difference r of the envelope branch and the phase branch of the polar transmitter and the EVM, and the EVM, obtaining a delay difference that needs to be compensated, including: acquiring by using successive compensation In the process of the EVM minimum value, the delay difference increment Δτ(η), Δτ(η) of the compensation required for the nth compensation is obtained according to the change value of the EVM caused by the n-1th compensation. The absolute value Δ Δτ(η) 减小 decreases as the number of compensations increases;

Performing delay compensation on the envelope branch of the polar transmitter and/or the phase branch according to the delay difference that needs to be compensated comprises: matching the pole according to an initial value of the set delay difference Coordinate The envelope branch of the transmitter and/or the phase branch performs initial delay compensation, and after the n-1th compensation, the acquired delay difference increment Δτ of the required compensation for the nth compensation is used ( η) performing delay compensation on the envelope branch of the polar transmitter and/or the phase branch.

The method according to claim 4, wherein in the process of acquiring the EVM minimum value by using the successive compensation, the nth time is obtained according to the change value of the EVM caused by the n-1th compensation The delay difference increment Δτ(η) for compensating for the required compensation includes:

Set the initial value of the delay difference ΔΓ(0), Ar(n) = Ar(n + l)-Ar(n); Use ΔΓ(η) = -sigrtEVM(n) - EVM(n - 1)] * Λτ( η -l)]*k is iterated, and the delay difference increment value of the compensation required for the nth compensation is obtained according to the set initial value of the delay difference and the EVM value

EVM(n)- EVM(n-l)> 0

Δ (η); where sign[EVM(n)- EVM(n~l)] _: EVM( n) - EVM( n-1 )= (

EVM(n)-EVM(n-1)< 0 k<l EVM(n)-EVM(n-l)>0

k<l EVM(n)_EVM(n_l) = 0.

k = l EVM(n)-EVM(n-l)<0

The method according to claim 4 or 5, wherein the delay compensation is completed when the change value of the EVM brought by the n-1th compensation is less than a preset minimum value.

7. Apparatus for correcting a delay difference of a polar coordinate transmitter, the apparatus comprising: an EVM generating unit for generating an error vector magnitude EVM of a polar coordinate transmitter output signal; a delay difference obtaining unit, connecting The EVM generating unit is configured to obtain a delay difference that needs to be compensated according to a functional relationship between a delay difference r of the envelope branch and the phase leg of the polar coordinate transmitter and the EVM, and the EVM Value

And a delay unit, configured to perform delay compensation on the envelope branch of the polar transmitter and/or the phase branch according to the delay difference that needs to be compensated.

The device according to claim 7, wherein a functional relationship between the delay difference r and the EVM is that the EVM is proportional to an absolute value of the r, or the EVM There is a minimum value.

9. Apparatus according to claim 7 or claim 8 wherein said EVM is proportional to the absolute value of said r: EVM-77 = |r| _; wherein: represents said polar transmitter The amount of influence on the EVM other than the delay difference is a constant coefficient related to the characteristics of the signal itself; the delay unit is specifically used to obtain a delay difference according to the EVM value, and to obtain compensation.

The device according to claim 7 or 8, wherein the function of the delay difference r and the EVM is a minimum value of the EVM;

The delay difference obtaining unit is specifically configured to obtain the compensation required for the nth compensation according to the change value of the EVM caused by the n-1th compensation in the process of acquiring the EVM minimum value by using the successive compensation. The delay difference increment Δτ(η), the absolute value I Δτ(η) I of Δτ(η) decreases as the number of compensations increases; the delay unit is specifically used according to the set delay difference The initial value is subjected to initial delay compensation for the envelope branch of the polar transmitter and/or the phase branch, and after the n-1th compensation, the acquired compensation for the nth compensation is used. The delay difference delta Δτ(η) compensates for the delay of the envelope branch and/or the phase leg of the polar transmitter.

The device according to claim 10, wherein the delay difference acquisition unit comprises:

The initial setting unit is used to set the initial value of the delay difference ΔΓ(0);

An incremental generation unit for iterating by using ΔΓ(η) = -sign[EVM (n) - Ε\ (η -1)]*Δ r(n-1)] * k, according to the initial setting unit setting The initial difference of the delay difference and the EVM value, the delay difference increment value Δτ(η) of the compensation required for the nth compensation is obtained;

Where ΔΓ(η) = ΔΓ(η + 1)— ΔΓ(η), sign[EVM(n)-EVM(n ;

k<l EVM(n)-EVM(n-l)>0

k is defined as k<l EVM(n)-EVM(n-l) = 0

k = l EVM(n)-EVM(nl)<0

The device according to claim 10 or 11, wherein the delay unit is further configured to: when the change value of the EVM caused by the n-1th compensation is less than a preset minimum value , end delay compensation.

13. A communication system, characterized in that the communication system comprises: a polar coordinate transmitter and a device for correcting a polar coordinate transmitter delay difference according to any one of claims 7 to 12, said polar coordinate transmission Forming a closed loop connection between the device and the device for correcting the delay of the polar transmitter; the closed loop connection comprises: the EVM generating unit, connecting an output of the polar transmitter; the delay unit, the connection The input of the polar transmitter.

The system according to claim 13, wherein the system further comprises: a down conversion unit, connected to an output of the polar transmitter and the EVM generating unit, for being subjected to down-conversion processing An output signal of the polar transmitter is provided to the EVM generating unit.