CN111525965A - Method for correcting power and EVM of transmitter, performance comparison method, device, equipment and readable storage medium - Google Patents
Method for correcting power and EVM of transmitter, performance comparison method, device, equipment and readable storage medium Download PDFInfo
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- CN111525965A CN111525965A CN202010138961.4A CN202010138961A CN111525965A CN 111525965 A CN111525965 A CN 111525965A CN 202010138961 A CN202010138961 A CN 202010138961A CN 111525965 A CN111525965 A CN 111525965A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B17/00—Monitoring; Testing
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- H04B17/11—Monitoring; Testing of transmitters for calibration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/15—Performance testing
Abstract
The invention discloses a method for correcting power and EVM of a transmitter, a performance comparison method, a device, equipment and a readable storage medium, wherein the method comprises the following steps: acquiring actual power measured by a transmitter under a test condition and an actual EVM corresponding to the actual power; correcting the actual power to obtain the corrected power of the transmitter and obtain the power corrected value of the corrected power; the power correction value is the difference value between the corrected power and the actual power; obtaining the EVM compensation quantity of the transmitter corresponding to the power correction value according to the relationship between the EVM compensation quantity and the power correction value obtained in advance; and obtaining the corrected EVM of the transmitter according to the EVM compensation quantity and the corresponding actual EVM. According to the invention, the power and the EVM are corrected, so that the accuracy of the EVM comparison result can be improved, and the EVM index of the transmitter is finally ensured to meet the design requirement.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, a device, and a readable storage medium for correcting power and EVM of a transmitter.
Background
The EVM (Error Vector Magnitude) is the Vector difference between an ideal Error-free reference signal and an actual transmitted signal at a given moment, and can comprehensively measure the amplitude Error and the phase Error of a modulated signal. The EVM is a key index for evaluating the quality of the output modulation signal of the transmitter, and is an important design basis for the transmitter. Under the same conditions, a smaller EVM indicates better transmitter performance. Due to the non-linear characteristic of the transmitter (mainly the non-linear characteristic of the Power Amplifier (PA)) the EVM and the output power have positive correlation, i.e. the larger the power is, the larger the EVM is, the smaller the power is. Therefore, when comparing EVMs, it is agreed that the output power is the same.
In many practical applications, the accuracy of the output power of the transmitter is limited due to the limitation of the control circuit of the transmitter, for example, the minimum adjustment step of the output power of the wifi chip is generally 0.5dB (i.e. the minimum adjustment unit is 0.5 dB). Due to the limited power control precision, the actual output power of the transmitter cannot be accurately adjusted to the target power, so that the actually obtained EVM cannot reach the expected value, and the finally obtained EVM has deviation, and thus, when the deviation-appearing EVM is used as the design basis of the transmitter, the finally designed EVM index of the transmitter cannot meet the requirement.
Furthermore, when performing EVM comparison, the EVM test cannot be performed because the power of both transmitters cannot be adjusted to be the same. If the target power is set to 17dBm, the first transmitter actual output power is 17.49dBm (this power is normal and within 0.5dB of accuracy, assuming that the EVM is EVM1, 29.5dB), and the second transmitter output power is 16.7dBm (assuming that the EVM is EVM2, 29.9 dB). In order to compare the performance of the two transmitting circuits, the current practice is to ignore the difference between the two output powers, directly compare the magnitudes of EVM1 and EVM2, and judge that the output EVM of the second transmitter is better than that of the first transmitter because EVM2 is smaller than EVM 1. It can be seen that, in practice, due to the limitation of the test conditions, the output powers of the two transmitters are different, and the power difference between them affects the accuracy of the comparison result of the EVM. Inaccurate evaluation of the EVM comparison results may affect the design of the transmitting circuit of the transmitter (e.g., cause the matching circuit of the transmitter to be designed to have wrong impedance), so that the EVM index of the transmitter does not meet the requirement.
Disclosure of Invention
The embodiment of the invention provides a method, a device and equipment for correcting power and EVM of a transmitter and a readable storage medium, which can effectively improve the accuracy of the obtained EVM and the accuracy of a comparison result of the EVM by correcting the power and the EVM, thereby finally ensuring that the EVM index of the transmitter meets the design requirement.
An embodiment of the present invention provides a method for correcting power and EVM of a transmitter, including:
acquiring actual power measured by a transmitter under a test condition and an actual EVM corresponding to the actual power;
correcting the actual power to obtain the corrected power of the transmitter and obtain the power corrected value of the corrected power; the power correction value is the difference value between the corrected power and the actual power;
obtaining the EVM compensation quantity of the transmitter corresponding to the power correction value according to the relationship between the EVM compensation quantity and the power correction value obtained in advance;
and obtaining the corrected EVM of the transmitter according to the EVM compensation quantity and the corresponding actual EVM.
As an improvement of the above scheme, the relationship between the EVM compensation amount EVMe and the power correction value Pe is as follows:
EVMe＝x*Pe；
wherein x is the slope of the tangent line of the EVM curve changing along with the power at the point of the corrected power Pc;
or, x ═ (EVMj-EVMk)/(Pj-Pk); the EVMj and EVMk are corresponding EVMs obtained by testing at two powers Pj and Pk selected near the corrected power Pc.
Another embodiment of the present invention provides a method for comparing transmitter performance, wherein the number of actual powers and the number of actual EVMs that need to be corrected for comparison are at least two, and on the basis of the method for correcting the powers and the EVMs of the transmitter according to any of the above aspects, the method further includes:
obtaining a performance comparison result of the transmitter according to the obtained correction power and at least two correction EVMs corresponding to the at least two actual EVMs; wherein, the corrected power obtained by correcting at least two actual powers is the same; the at least two actual powers and the at least two actual EVMs correspond to at least two transmitters, or to at least two different test conditions of the same transmitter.
As an improvement of the above solution, the obtaining a performance comparison result of the transmitter according to the obtained corrected power and two corrected EVMs corresponding to the two actual EVMs includes:
comparing the two corrected EVMs by taking the corrected power as a target comparison power, and outputting a comparison result;
or, drawing a loadpull graph according to the obtained correction power and the two correction EVMs, and outputting and displaying the loadpull graph.
As an improvement of the above scheme, the modified power is an average value of the two actual powers, or a preset target power.
Another embodiment of the present invention correspondingly provides a device for correcting power and EVM of a transmitter, including:
the acquisition module is used for acquiring the actual power measured by the transmitter under the test working condition and the actual EVM corresponding to the actual power;
the first correction module is used for correcting the actual power to obtain the correction power of the transmitter and obtain the power correction value of the correction power; the power correction value is the difference value between the corrected power and the actual power;
the calculation module is used for obtaining the EVM compensation quantity of the transmitter corresponding to the power correction value according to the relationship between the EVM compensation quantity and the power correction value obtained in advance;
and the second correction module is used for obtaining the corrected EVM of the transmitter according to the EVM compensation quantity and the corresponding actual EVM.
Another embodiment of the present invention correspondingly provides a transmitter performance comparison apparatus, wherein the actual power and the number of the actual EVMs that need to be corrected for comparison are at least two, and on the basis of the above apparatus for correcting the power and the EVMs, the apparatus further includes:
the comparison module is used for obtaining a performance comparison result of the transmitter according to the obtained correction power and at least two correction EVMs corresponding to the at least two actual EVMs; wherein, the corrected power obtained by correcting at least two actual powers is the same; the at least two actual powers and the at least two actual EVMs correspond to at least two transmitters, or to at least two different test conditions of the same transmitter.
Another embodiment of the present invention provides a device for correcting power and EVM of a transmitter, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the method for correcting power and EVM of a transmitter according to the above embodiment of the present invention when executing the computer program.
Another embodiment of the present invention provides a transmitter performance comparison apparatus, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the transmitter performance comparison apparatus implements the transmitter performance comparison method according to the above embodiment of the present invention.
Another embodiment of the present invention provides a storage medium, where the storage medium includes a stored computer program, where the computer program, when running, controls an apparatus where the storage medium is located to execute the method for correcting power and EVM of a transmitter according to the above embodiment of the present invention.
Compared with the prior art, the method, the device, the equipment and the readable storage medium for correcting the power and the EVM of the transmitter provided by the embodiment of the invention correct the actual power, then obtain the EVM compensation quantity of the transmitter corresponding to the power correction value according to the relationship between the EVM compensation quantity and the power correction value obtained in advance, and finally obtain the corrected EVM of the transmitter according to the EVM compensation quantity and the corresponding actual EVM. From the above analysis, the embodiment of the invention can improve the accuracy of the obtained EVM; in addition, the embodiment of the invention can adopt the same power value when the EVM is compared, and the EVM is corrected, so that the accuracy of the EVM comparison result can be improved, and the EVM index of the transmitter can be finally ensured to meet the design requirement when the transmitter is designed according to the EVM comparison result.
Drawings
Fig. 1 is a schematic flow chart of a method for correcting power and EVM of a transmitter according to an embodiment of the present invention;
FIG. 2 is a graph of EVM as a function of power;
FIG. 3 is a loadpull graph plotted using an unmodified EVM;
FIG. 4 is a loadpull diagram of an EVM plot corrected using a correction method provided by an embodiment of the present invention;
fig. 5 is a schematic flow chart of a device for correcting power and EVM of a transmitter according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a flow chart of a method for correcting power and EVM of a transmitter according to an embodiment of the present invention is shown, where the method includes:
s10, acquiring actual power measured by the transmitter under the test condition and an actual EVM corresponding to the actual power;
s11, correcting the actual power to obtain the corrected power of the transmitter, and obtaining the power corrected value of the corrected power; the power correction value is the difference value between the corrected power and the actual power; the corrected power is a power value for comparison;
wherein the power correction value Pe is the corrected power Pc — the actual power P. (1)
S12, obtaining the EVM compensation quantity of the transmitter corresponding to the power correction value according to the relationship between the EVM compensation quantity and the power correction value obtained in advance;
the relationship between the EVM compensation amount and the power correction value (specifically, the EVM compensation amount EVMe may be related to a curve of the EVM along with the power change), may be derived in advance through a power amplifier model of the transmitter, or may be fitted through actual measurement or simulation, so that when the power correction value is known, the corresponding EVM compensation amount may be known according to the relationship.
Specifically, a curve of the EVM compensation amount EVMe and the EVM according to the power variation may be as shown in fig. 2, and the expression of the curve is: EVM ═ f (power). From this curve, the relationship between EVMe and Pc and P can be determined.
EVMe＝f(Pc)-f(P) (2)
And S13, obtaining the corrected EVM of the transmitter according to the EVM compensation quantity and the corresponding actual EVM.
Here, the actual EVM is compensated by EVMe to obtain a result of EVM correction, which is referred to as a corrected EVM (denoted by EVMc):
EVMc＝EVM+EVMe＝EVM+f(Pc)-f(P) (3)
in the embodiment of the invention, the actual power is corrected, the EVM compensation quantity corresponding to the power correction value of the transmitter is obtained according to the relationship between the EVM compensation quantity and the power correction value obtained in advance, and finally the corrected EVM of the transmitter is obtained according to the EVM compensation quantity and the corresponding actual EVM. From the above analysis, the embodiment of the invention can improve the accuracy of the obtained EVM; in addition, the embodiment of the invention can adopt the same power value when the EVM is compared, and the EVM is corrected, so that the accuracy of the EVM comparison result can be improved, and the EVM index of the transmitter can be finally ensured to meet the design requirement when the transmitter is designed according to the EVM comparison result.
It should be noted that, by applying the correction method of the embodiment of the present invention, the EVM corresponding to each power value of the transmitter can be obtained more accurately, the corresponding relationship between the power and the EMV can be fitted better, an accurate basis is provided for the product design of the transmitter, and the method is not affected by the field environment or the equipment precision.
It should be noted that the correction method according to the embodiment of the present invention may be performed by a power of a transmitter and a correction device of the EVM, where the correction device may be a computing device such as a computer or a smart phone.
In the above embodiment of the invention, for example, the relationship between the EVM compensation amount EVMe and the power correction value Pe is:
EVMe＝x*Pe；
wherein x is the slope of the tangent line of the EVM curve changing along with the power at the point of the corrected power Pc;
or, x ═ (EVMj-EVMk)/(Pj-Pk); the EVMj and EVMk are corresponding EVMs obtained by testing at two powers Pj and Pk selected near the corrected power Pc.
To facilitate an understanding of this embodiment, the following example is presented here:
the first derivative of the EVM with power curve at the modified power (set to x), since Pc is very close to P, the product of x and the power modification value is approximately equal to the EVM compensation amount. Namely:
EVMe＝f(Pc)-f(P)≈x*(Pc-P)＝x*Pe (4)
in addition to the first derivative of the curve shown in FIG. 2, x in equation (4) can be obtained by approximation without the curve function by the following method: testing EVM corresponding to two powers Pj and Pk near Pc, namely adjusting the power to Pj to obtain (Pj, EVMj), adjusting the power to Pk to obtain (Pk, EVMk), and then
x＝(EVMj-EVMk)/(Pj-Pk)
Examples are: (hereinafter, power is in dBm, and EVM is calculated in dB.)
One set of actual power/EVM test results is (P1, EVM1) ═ 17.49, -29.5, (P2, EVM2) ═ 16.7, -29.8, and the corrected power Pc is taken as the average of the actual powers, i.e. the corrected power Pc is taken as the average of the actual powers
Pc＝(P1+P2)/2＝17.095
The power correction values are Pe 1-Pc-P1-0.395, and Pe 2-Pc-P2-0.395, respectively
The EVM versus power change curve can be obtained by transmitter model analysis or actual measurement fitting, as shown in fig. 2. With this curve, the derivative, i.e. the slope of the tangent, is found at the Pc power point, denoted by x, which is set to 1.4 in this example.
The amount of compensation for EVM1, EVMe1, is a function of Pe1 and is related to the derivative of the curve. In this example, a linear function model is used: EVMe 1-x Pe 1-1.4-0.395-0.553, EVM1 was compensated with EVMe1, i.e., EVMc 1-EVM 1+ EVMe 1-30.053;
the compensation amount EVMe 2-x Pe 2-1.4-0.395-0.553 of EVM 2. The EVM2 compensated value is EVMc2 ═ EVM1+ EVMe1 ═ -29.247.
The corrected power and EVM are (Pc, EVMc1) ═ (17.095, -30.053) and (Pc, EVMc2) ═ (17.095, -29.247), and then the EVM comparison can be performed under the same power, and EVMc1 is better than EVMc 2.
After the actual power of the transmitter and the actual EVM are corrected by the correction method, the actual power of the transmitter and the actual EVM may be used for performance comparison of the transmitter, and specifically, if the actual power and the actual EVM that need to be corrected for comparison are both at least two, the method for performance comparison of the transmitter further includes, based on the method for correcting the power of the transmitter and the EVM in any of the above-mentioned schemes:
obtaining a performance comparison result of the transmitter according to the obtained correction power and at least two correction EVMs corresponding to the at least two actual EVMs; wherein, the corrected power obtained by correcting at least two actual powers is the same; the at least two actual powers and the at least two actual EVMs correspond to two transmitters, or correspond to at least two different test conditions of the same transmitter.
In the embodiment of the present invention, the number of the transmitters is illustratively at least two; and the correction power of different transmitters is the same. Wherein it is understood that the at least two transmitters are transmitters for performing the EVM comparison. It should be noted that, when the number of the transmitters is two or more, the power of one of the transmitters may be kept unchanged, and then the power of the remaining transmitters may be corrected to be the same as the power of the transmitter. Of course, the at least two actual powers and the at least two actual EVMs that need to be corrected for comparison may also be obtained by the same transmitter under at least two different test conditions, respectively.
In the above embodiment of the invention, for example, the corrected power may be an average value of two actual powers. Of course, the corrected power may be a predetermined target power, for example, the actual output power of the first transmitter is 17.49dBm, the actual output power of the second transmitter is 16.7dBm, and the corrected power of the two transmitters may be 17 dBm.
In the above embodiment, for example, the obtaining the performance comparison result of the transmitter according to the obtained modified power and two modified EVMs corresponding to the two actual EVMs includes:
comparing the two corrected EVMs by taking the corrected power as a target comparison power, and outputting a comparison result; (ii) a
By outputting the comparison result, the designer of the transmitter can clearly know the EVM performance of the transmitter, and then the designer can redesign the transmitting circuit of the transmitter according to the EVM comparison result. Of course, a report instructing the design of the transmitter circuit of the transmitter may be output by the above-mentioned computing device (e.g., a computer) according to the comparison result, so that the designer can know the direction of the design modification according to the report. It is understood that the reported guidance direction for guiding the design may be obtained in advance from the results of simulation or actual test.
Or, comprising:
and drawing a loadpull graph according to the obtained correction power and the two correction EVMs, and outputting and displaying the loadpull graph.
The Loadpull diagram is an important basis for designing a matching circuit of a transmitter, and is used as a performance comparison diagram of the transmitter. In an actual test, due to the limitation of power control precision, a power error exists, the error changes the shape of a loadpull diagram contour line, and the judgment of an optimal matching area is wrong, so that a matching circuit of a transmitter is designed to wrong impedance, and the EVM index of the transmitter is not in accordance with the requirement. The embodiment of the invention can solve the problem and improve the accuracy of the EVM Loadpull diagram of the transmitter (or PA), because the EVM Loadpull diagram has the precondition that the same power is ensured. In addition, in the embodiment of the present invention, a Loadpull graph is drawn by using the obtained correction powers of different transmitters and the obtained correction EVM, and is output and displayed, so that a designer can clearly know the quality of a Loadpull test result of a transmitter, and thus, a transmitter circuit of the transmitter can be redesigned according to the Loadpull test result.
The following are the effects of using the method of the present embodiment: fig. 3 is a loadpull graph drawn using an unmodified EVM, and there are two peak regions, which are actually better EVM than its surroundings due to their lower power than surroundings, and are not true performance-excellent regions (which may be referred to as false peak regions). By correcting the EVM data through the method and redrawing the loadpull graph, as shown in FIG. 4, the two false peak areas disappear, and the misjudgment of the result can be avoided.
Referring to fig. 5, it is a schematic structural diagram of an apparatus for correcting power and EVM of a transmitter according to an embodiment of the present invention, the apparatus includes:
an obtaining module 10, configured to obtain actual power measured by a transmitter under a test condition and an actual EVM corresponding to the actual power;
a first correction module 11, configured to correct the actual power to obtain a corrected power of the transmitter, and obtain a power corrected value of the corrected power; the power correction value is the difference value between the corrected power and the actual power;
a calculating module 12, configured to obtain an EVM compensation amount of the transmitter corresponding to the power correction value according to a relationship between the EVM compensation amount and the power correction value obtained in advance;
and a second correction module 13, configured to obtain a corrected EVM of the transmitter according to the EVM compensation amount and the corresponding actual EVM.
In the embodiment of the invention, the actual power is corrected to the correction power for comparison, then the EVM compensation quantity corresponding to the power correction value of the transmitter is obtained according to the relationship between the EVM compensation quantity and the power correction value obtained in advance, and finally the corrected EVM of the transmitter is obtained according to the EVM compensation quantity and the corresponding actual EVM. From the above analysis, the embodiment of the invention can improve the accuracy of the obtained EVM; in addition, the embodiment of the invention can adopt the same power value when the EVM is compared, and the EVM is corrected, so that the accuracy of the EVM comparison result can be improved, and the EVM index of the transmitter can be finally ensured to meet the design requirement when the transmitter is designed according to the EVM comparison result.
As an improvement of the above scheme, the modified power is an average value of the actual powers of different transmitters, or a preset target power.
As an improvement of the above scheme, the relationship between the EVM compensation amount EVMe and the power correction value Pe is as follows:
EVMe＝x*Pe；
wherein x is the slope of the tangent line of the EVM curve changing along with the power at the point of the corrected power Pc;
or, x ═ (EVMj-EVMk)/(Pj-Pk); the EVMj and EVMk are corresponding EVMs obtained by testing at two powers Pj and Pk selected near the corrected power Pc.
Another embodiment of the present invention correspondingly provides a transmitter performance comparison apparatus, wherein the actual power and the number of the actual EVMs that need to be corrected for comparison are at least two, and on the basis of the above apparatus for correcting the power and the EVMs, the apparatus further includes:
the comparison module is used for obtaining a performance comparison result of the transmitter according to the obtained correction power and at least two correction EVMs corresponding to the at least two actual EVMs; wherein, the corrected power obtained by correcting at least two actual powers is the same; the at least two actual powers and the at least two actual EVMs correspond to at least two transmitters, or to at least two different test conditions of the same transmitter.
As an improvement of the above solution, the obtaining a performance comparison result of the transmitter according to the obtained corrected power and two corrected EVMs corresponding to the two actual EVMs includes:
comparing the two corrected EVMs by taking the corrected power as a target comparison power, and outputting a comparison result;
or, drawing a loadpull graph according to the obtained correction power and the two correction EVMs, and outputting and displaying the loadpull graph.
As an improvement of the above scheme, the modified power is an average value of the two actual powers, or a preset target power.
Another embodiment of the present invention provides a power of transmitter and EVM correction apparatus. The power of the transmitter and the correction device/apparatus of the EVM of this embodiment include: a processor, a memory, and a computer program stored in the memory and executable on the processor. The processor, when executing the computer program, implements the steps in the above-described embodiments of the method for modifying power and EVM for each transmitter. Alternatively, the processor, when executing the computer program, implements the functions of the modules/units in the above-described power of the respective transmitters and EVM correction apparatus embodiments.
Another embodiment of the present invention provides a transmitter performance comparison apparatus, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the transmitter performance comparison apparatus implements the transmitter performance comparison method according to the above embodiment of the present invention. Alternatively, the processor, when executing the computer program, implements the functions of the modules/units in the performance comparison apparatus embodiments of the above-mentioned transmitters.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions.
The correction device or the comparison device may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The power of the transmitter and the EVM modification means/device may include, but is not limited to, a processor, a memory. It will be understood by those skilled in the art that the schematic diagrams are merely examples of the modifying or comparing device and do not constitute a limitation of the modifying or comparing device, and may include more or less components than those shown, or combine certain components, or different components, for example, the modifying or comparing device may also include an input-output device, a network access device, a bus, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being the control center of the correction device or the comparison device, the whole correction device or various parts of the comparison device being connected by various interfaces and lines.
The memory may be used to store the computer programs and/or modules, and the processor may implement various functions of the correction device or the comparison device by executing or executing the computer programs and/or modules stored in the memory and calling data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data (such as audio data, a phonebook, etc.) created according to the use of the cellular phone, and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
Wherein, the module/unit integrated with the correction device or the comparison device can be stored in a computer readable storage medium if it is implemented in the form of software functional unit and sold or used as a stand-alone product. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for correcting power and EVM of a transmitter, comprising:
acquiring actual power measured by a transmitter under a test condition and an actual EVM corresponding to the actual power;
correcting the actual power to obtain corrected power of the transmitter and obtain a power corrected value; the power correction value is the difference value between the corrected power and the actual power;
obtaining the EVM compensation quantity of the transmitter corresponding to the power correction value according to the relationship between the EVM compensation quantity and the power correction value obtained in advance;
and obtaining the corrected EVM of the transmitter according to the EVM compensation quantity and the corresponding actual EVM.
2. The method for correcting power and EVM of a transmitter according to claim 1, wherein the EVM compensation amount EVMe is related to a power correction value Pe by:
EVMe＝x*Pe；
wherein x is the slope of the tangent line of the EVM curve changing along with the power at the point of the corrected power Pc;
or, x ═ (EVMj-EVMk)/(Pj-Pk); the EVMj and EVMk are corresponding EVMs obtained by testing at two powers Pj and Pk selected near the corrected power Pc.
3. A transmitter performance comparison method, wherein the number of actual powers and actual EVMs that need to be corrected for comparison is at least two, and based on the method for correcting powers and EVMs of a transmitter according to any one of claims 1 to 2, further comprising:
obtaining a performance comparison result of the transmitter according to the obtained correction power and at least two correction EVMs corresponding to the at least two actual EVMs; wherein, the corrected power obtained by correcting at least two actual powers is the same; the at least two actual powers and the at least two actual EVMs correspond to at least two transmitters, or to at least two different test conditions of the same transmitter.
4. The method of comparing transmitter performance according to claim 3, wherein the obtaining a performance comparison result of the transmitter based on the obtained modified power and at least two modified EVMs corresponding to the two actual EVMs comprises:
comparing the at least two corrected EVMs by taking the corrected power as a target comparison power, and outputting a comparison result;
or, drawing a loadpull graph according to the obtained correction power and the at least two correction EVMs, and outputting and displaying the loadpull graph.
5. The method of claim 3, wherein the modified power is an average of the two actual powers or a preset target power.
6. An apparatus for correcting power and EVM of a transmitter, comprising:
the acquisition module is used for acquiring the actual power measured by the transmitter under the test working condition and the actual EVM corresponding to the actual power;
the first correction module is used for correcting the actual power to obtain the corrected power of the transmitter and obtain a power corrected value; the power correction value is the difference value between the corrected power and the actual power;
the calculation module is used for obtaining the EVM compensation quantity of the transmitter corresponding to the power correction value according to the relationship between the EVM compensation quantity and the power correction value obtained in advance;
and the second correction module is used for obtaining the corrected EVM of the transmitter according to the EVM compensation quantity and the corresponding actual EVM.
7. A transmitter performance comparison apparatus, wherein the number of actual powers and actual EVMs to be corrected for comparison is at least two, further comprising, based on the apparatus for correcting powers and EVMs of a transmitter of claim 6:
the comparison module is used for obtaining a performance comparison result of the transmitter according to the obtained correction power and at least two correction EVMs corresponding to the at least two actual EVMs; wherein, the corrected power obtained by correcting at least two actual powers is the same; the at least two actual powers and the at least two actual EVMs correspond to at least two transmitters, or to at least two different test conditions of the same transmitter.
8. A device for correcting power and EVM of a transmitter, comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, wherein the processor, when executing the computer program, implements a method for correcting power and EVM of a transmitter according to any one of claims 1 to 2.
9. A transmitter performance comparison device comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the transmitter performance comparison method as claimed in any one of claims 3 to 5 when executing the computer program.
10. A computer-readable storage medium, comprising a stored computer program, wherein the computer program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method of power and EVM correction for a transmitter as claimed in any one of claims 1 to 2.
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