CN115219867A - Vector error amplitude measuring device and measuring method, terminal and storage medium - Google Patents
Vector error amplitude measuring device and measuring method, terminal and storage medium Download PDFInfo
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Abstract
The invention relates to the technical field of measurement of modulation parameters of primary-level semiconductor devices, in particular to a vector error amplitude measuring device, a measuring method, a terminal and a storage medium. In some application scenes, the microwave source comprises a microwave signal source and a power divider, so that signals are respectively sent to an up-conversion unit and a down-conversion unit after power is distributed according to needs, the complexity of the system is reduced, the number of adopted microwave signal sources is less, the test requirement of the power amplifier of the terahertz frequency band can be met, the problem that existing measuring equipment and instruments cannot test high-frequency to-be-tested pieces is solved, and the analysis result obtained by a signal analyzer is more accurate.
Description
Technical Field
The invention relates to the technical field of measurement of modulation parameters of a primary-level semiconductor device, in particular to a vector error amplitude measuring device, a measuring method, a terminal and a storage medium.
Background
International measurements of Vector Error Magnitude (EVM) of power amplifiers in low frequency bands (e.g. below 50 GHz) usually use direct test method of Vector Signal generator and Vector Signal Analyzer (VSA). Vector signal analyzers have started to research earlier in developed countries, and some mature products are available. The conventional vector signal analyzer manufacturer continuously invests in research and development on the basis of the existing products. Although 85GHz vector signal analyzers appear successively in recent years, commercial systems at present only test the power amplifier adjacent channel power rejection ratio and vector error amplitude to 67GHz, which is mainly limited by that the highest output frequency of a vector signal source is only 67GHz.
EVM is the vector error of the ideal error-free signal and the actual transmitted signal at a given time. Since this value also changes every symbol change, the EVM is then defined as the root mean square value of the error vector over a period of time. The larger the EVM value is, the worse the modulation quality of the transmitted signal is; the smaller the EVM, the better the transmit signal modulation quality. It should be noted that the index defines not the modulation accuracy of the rf signal, but the modulation accuracy of discrete I/Q values sampled after mapping the rf signal to the I/Q plane. The out-of-band noise is suppressed because the discrete IQ data is filtered by the matched filter before being collected. Therefore, what affects EVM most is the non-linear product of the transmit channel, especially the in-band distortion of the signal.
EVM is defined as the root mean square value of the ratio of the average error vector signal power to the average reference signal power:
in the formula, S n For discrete I/Q values obtained by sampling, N is the total number of samples, EVM RMS Is the root mean square value of the ratio of the average error vector signal power to the average reference signal power.
In some millimeter wave and THz applications this frequency range is not sufficient. A popular frequency range extension method is to use a mixing up-conversion device to up-convert the output frequency to a desired millimeter wave frequency band.
As shown in fig. 1, fig. 1 shows a millimeter wave vector source structure, and in the implementation process of such a scheme, it is found that the up-converter and the driving and discharging deteriorate the broadband signal quality of the microwave vector source. Conventional vector signal sources have EVMs below 0.5%, which must be small enough to test the EVM introduced by the power amplifier. If the EVM of the vector signal source is greatly influenced by the circuit, whether the EVM measured by the system is introduced by the power amplifier or the vector signal source is introduced by an external circuit cannot be evaluated. Therefore, the EVM of the vector signal source needs to be corrected before testing. However, in order to measure the modulation quality of the tested amplifier, the signal quality of the millimeter wave signal source must be improved first, and predistortion correction needs to be performed on the baseband signal of the vector source, that is, when the signal source outputs a broadband signal, the amplitude and phase of each frequency point in the band are compensated and corrected automatically, so that the modulation quality of the drive amplifier output end is optimal.
Based on this, it is necessary to develop and design a vector error magnitude measurement method to solve the above-mentioned problem of microwave vector source signal degradation.
Disclosure of Invention
The embodiment of the invention provides a vector error amplitude measuring device and method, a terminal and a storage medium, which are used for solving the problem that vector error amplitude measuring results are influenced by vector signal source distortion in the prior art.
In a first aspect, an embodiment of the present invention provides a vector error magnitude measurement apparatus, including:
the device comprises a microwave source, a vector source, an up-conversion unit and a signal analyzer;
the microwave source and the vector source are respectively connected with the input end of the up-conversion unit through signals;
the signal analyzer is configured to receive a second vector signal via an input and to output frequency response data indicative of the second vector signal;
the output end of the up-conversion unit is used for outputting a first vector signal, wherein the second vector signal is generated based on the first vector signal, the vector source outputs a signal according to a frequency response data table, the first vector signal is generated based on the output signal of the vector source and a frequency doubling signal of the output signal of the microwave source through frequency mixing, and the frequency response data table is generated according to a plurality of frequency response data.
In one possible implementation manner, the vector error magnitude measurement apparatus further includes:
the output end of the down-conversion unit is in signal connection with the input end of the signal analyzer;
the input end of the down-conversion unit is used for inputting a third vector signal, the output end of the down-conversion unit outputs the second vector signal, and the second vector signal is generated by down-conversion based on the third vector signal.
In one possible implementation manner, the down-conversion unit includes:
the input end of the down converter is in signal connection with the output end of the attenuator, and the output end of the down converter is in signal connection with the input end of the signal analyzer;
the input end of the attenuator is used for inputting the third vector signal, and the down converter performs down conversion according to the output of the attenuator to generate the second vector signal.
In one possible implementation, the microwave source includes: the microwave signal source is in signal connection with the input end of the power divider, and the output end of the power divider is in signal connection with the up-conversion unit and the down-conversion unit respectively;
the power divider is configured to distribute power to the local oscillator signal generated by the microwave signal source according to a preset value, and then transmit the local oscillator signal to the up-conversion unit and the down-conversion unit, where the up-conversion unit outputs the first vector signal based on the local oscillator signal and an output signal of the vector source, and the down-conversion unit outputs the second vector signal based on the local oscillator signal and the third vector signal.
In one possible implementation, the up-conversion unit includes:
the input end of the frequency multiplier is in signal connection with the output end of the microwave source, the output end of the frequency multiplier and the output end of the vector signal source are respectively in signal connection with the input end of the frequency mixer, the output end of the frequency mixer is in signal connection with the input end of the isolator, and the output end of the isolator is in signal connection with the input end of the drive amplifier;
the frequency multiplier generates a frequency multiplication signal of an output end signal of the microwave source, the mixer generates a mixing signal based on the output signal of the vector source and the frequency multiplication signal, and the driving amplifier generates the second vector signal based on amplification of the mixing signal.
In a second aspect, an embodiment of the present invention provides a vector error magnitude measurement method, including:
based on a plurality of test points, carrying out calibration test on the vector error amplitude measuring device to obtain a plurality of frequency response data, wherein the plurality of test points comprise different frequency points and different power points, and the vector error amplitude measuring device is not connected to a measured target in the calibration test;
generating calibration compensation data according to the plurality of frequency response data, inputting the calibration compensation data to the vector source, and calibrating the vector error amplitude measuring device;
and accessing the target to be tested to the vector error amplitude measuring device, and testing the target to be tested based on a plurality of test points to obtain vector error amplitude data, wherein the plurality of test points comprise different frequency points and different power points.
In a possible implementation manner, the testing the vector error magnitude measurement apparatus based on a plurality of test points to obtain a plurality of frequency response data includes:
for each frequency point and for each power point, the following steps are performed:
generating a first vector signal according to the frequency point and the power point;
acquiring a first vector error amplitude according to the second vector signal;
preprocessing according to the first vector error amplitude to generate a calibration file;
and adding the calibration file into a calibration file database.
In a possible implementation manner, accessing the target to be tested to the vector error magnitude measurement apparatus, and testing the target to be tested based on a plurality of test points to obtain vector error magnitude data includes:
for each frequency point and for each power point, the following steps are performed:
acquiring a calibration file from a calibration file database according to the frequency point and the power point;
generating a first vector signal according to the calibration file;
acquiring a second vector error amplitude according to the second vector signal;
adding the second vector error magnitude to the vector error magnitude data.
In a third aspect, an embodiment of the present invention provides a terminal, which includes a memory and a processor, where the memory stores a computer program that is executable on the processor, and the processor executes the computer program to implement the steps of the method according to the second aspect or any one of the possible implementation manners of the second aspect.
In a fourth aspect, the present invention provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of the method according to the second aspect or any one of the possible implementation manners of the second aspect.
Compared with the prior art, the implementation mode of the invention has the following beneficial effects:
the embodiment of the invention discloses a vector error amplitude measuring device which is provided with an up-conversion unit and a signal analyzer, and based on the signal analyzer analyzing the signal deterioration degree, namely frequency response data, which is loaded to a measured target after up-conversion, the signal deterioration degree in up-conversion and down-conversion of a vector signal is corrected by the frequency response data, so that the influence of EVM deterioration brought by a vector source is greatly reduced, and the measurement precision of EVM is improved. In some application scenarios, the microwave source comprises a microwave signal source and a power divider, so that the signals are respectively sent to the up-conversion unit and the down-conversion unit after power is distributed according to needs, the system complexity is reduced, the number of adopted microwave signal sources is less, the up-conversion and down-conversion microwave signal sources are more consistent, and the analysis result obtained by the signal analyzer is more accurate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic diagram of a millimeter wave vector source structure in the prior art according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first vector error magnitude measuring device provided in an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second vector error magnitude measuring apparatus applied in a calibration process according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a second vector error magnitude measuring apparatus applied in a measurement process according to an embodiment of the present invention;
FIG. 5 is a flow chart of a vector error magnitude measurement method provided by an embodiment of the invention;
fig. 6 is a functional block diagram of a terminal according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following description is made with reference to the accompanying drawings.
The following is a detailed description of the embodiments of the present invention, which is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Fig. 2 is a schematic diagram of a first vector error magnitude measurement apparatus according to an embodiment of the present invention.
As shown in fig. 2, it shows a schematic diagram of a first vector error magnitude measuring apparatus provided in the embodiment of the present invention, which is detailed as follows:
a vector error magnitude measurement apparatus comprising:
a microwave source 202, a vector source 201, an up-conversion unit 203 and a signal analyzer 205;
the microwave source 202 and the vector source 201 are respectively connected with the input end of the up-conversion unit 203;
the signal analyzer 205 is configured to receive a second vector signal via an input and to output frequency response data indicative of the second vector signal;
the output end of the up-conversion unit 203 is configured to output a first vector signal, where the second vector signal is generated based on the first vector signal, the vector source 201 outputs a signal according to a frequency response data table, the first vector signal is generated based on a frequency mixing of an output signal of the vector source 201 and a frequency doubling signal of an output signal of the microwave source 202, and the frequency response data table is generated according to a plurality of frequency response data.
Illustratively, in order to test the adjacent channel rejection ratio and vector error amplitude parameter of the terahertz frequency band (such as 75 GHz-110 GHz), a vector signal source of 75 GHz-110 GHz is required. One possible solution is to move the low frequency vector signal source to 75 GHz-110 GHz via an up-converter. Since the power amplifier to be tested requires a high input power, the driver amplifier must also be selected. In order to prevent the signal from flowing backward and damaging the up-converter and the vector signal source, an isolator 206 is also connected to the system. The power amplifier to be tested outputs too high signal power and needs a power attenuator to be connected with a signal analyzer. The introduction of the up-converter, isolator 206 and driver amplifier can degrade the vector signal EVM, so vector signal source predistortion techniques have also been investigated to reduce the degradation of EVM.
Therefore, the embodiment of the invention provides a technical scheme for solving the problem that the EVM of the vector signal is poor and affects the measurement result: the vector signal source is required to have a frequency response calibration function or a baseband function, the millimeter wave signal analyzer or the radio frequency signal analyzer is externally connected with a millimeter wave mixer, works in a linear region, is subjected to amplitude and phase calibration when being delivered from a factory, is built in the instrument and can be used as a reference instrument, and a distortion measurement function is adopted to actually measure signals sent by the vector source 201 through the up-converter and the driving amplifier 204, so that an in-band frequency response data table is obtained and is used as a correction compensation value, wherein the in-band frequency response data table comprises an amplitude frequency response and a phase frequency response. The correction compensation data table is uploaded to a vector source, and real-time distortion compensation is performed on the baseband signal, which is a so-called predistortion process.
In an application scenario, one mode is that a function of predistortion can adopt a built-in option of a signal analyzer and combines a vector signal source correction data import function; alternatively, a network analyzer may be used to obtain the nonlinear distortion of the up-converter and the driver amplifier as correction data, and to obtain amplitude and phase amplitude curve data, with the frequency axis corresponding to the IF frequency.
In one configuration, the vector error magnitude measurement device includes a vector source 201, a microwave source 202, an up-conversion unit 203, and a signal analyzer 205, and in some scenarios, may further include a driver amplifier 204 and/or an attenuator 2081.
The signal of the vector source 201 and the signal of the microwave source 202 are mixed in the up-conversion unit 203 to generate a high frequency signal, which needs to be amplified by the driving amplifier 204 in some scenes, and then, when the driving amplifier 204 is provided, in order to prevent the signal level from being too high and exceeding the capability of the signal analyzer, an attenuator 2081 is further provided, the high frequency signal passing through the path is sent to the signal analyzer 205, the degree of signal deterioration when passing through the intermediate components such as the up-conversion unit 203 and the like is analyzed, and generally speaking, frequency response data is input into the vector source 201, and the vector signal is corrected according to the frequency response data, so that the vector signal EVM deterioration is finally removed or reduced.
In some embodiments, the vector error magnitude measurement apparatus further comprises:
a down-conversion unit 208, an output end of the down-conversion unit 208 is connected with an input end of the signal analyzer 205 by a signal;
an input end of the down-conversion unit 208 is configured to input a third vector signal, and an output end of the down-conversion unit 208 outputs the second vector signal, where the second vector signal is generated by down-conversion based on the third vector signal.
In some embodiments, the down-conversion unit 208 includes:
an attenuator 2081 and a down converter 2082, wherein the input end of the down converter 2082 is in signal connection with the output end of the attenuator 2081, and the output end of the down converter 2082 is in signal connection with the input end of the signal analyzer 205;
the input end of the attenuator 2081 is used for inputting the third vector signal, and the down-converter 2082 performs down-conversion according to the output of the attenuator 2081 to generate the second vector signal.
In some embodiments, the microwave source 202 comprises: a microwave signal source 2021 and a power divider 2022, where the microwave signal source 2021 is in signal connection with an input end of the power divider 2022, and an output end of the power divider 2022 is in signal connection with the up-conversion unit 203 and the down-conversion unit 208, respectively;
the power divider 2022 is configured to transmit the local oscillator signal generated by the microwave signal source 2021 to the up-conversion unit 203 and the down-conversion unit 208 after distributing power according to a preset value, where the up-conversion unit 203 outputs the first vector signal based on the local oscillator signal and the output signal of the vector source 201, and the down-conversion unit 208 outputs the second vector signal based on the local oscillator signal and the third vector signal.
Fig. 3 is a schematic diagram illustrating a second vector error magnitude measuring apparatus applied in a calibration process according to an embodiment of the present invention.
In some applications, the frequency of the up-converted vector signal exceeds the range that can be processed by the signal analyzer 205, and it is necessary to add a down-conversion unit 208 to down-convert the vector signal and send it to the signal analyzer 205.
Generally, the down-conversion unit 208 includes an attenuator 2081 and a down-converter 2082, and the vector signal is attenuated by the attenuator 2081 and then down-converted by the down-converter 2082.
In order to enable the vector signals before up-conversion and the vector signals after down-conversion to have the same frequency and reduce the number of the applied microwave signal sources 2021, in an application scenario, the microwave source 202 includes a microwave signal source 2021 and a power divider 2022, the power divider 2022 divides the microwave signal source 2021 into two parts according to a predetermined power, and the two parts are respectively sent to the up-conversion unit 203 and the down-conversion unit 208, so that the same source of the vector signals is up-converted and down-converted.
In some embodiments, the up-conversion unit 203 comprises:
a frequency multiplier 2031, a mixer 2032, an isolator 206 and a driver amplifier 204, wherein an input end of the frequency multiplier 2031 is in signal connection with an output end of the microwave source 202, an output end of the frequency multiplier 2031 and an output end of the vector signal source are in signal connection with an input end of the mixer 2032, an output end of the mixer 2032 is in signal connection with an input end of the isolator 206, and an output end of the isolator 206 is in signal connection with an input end of the driver amplifier 204;
the frequency multiplier 2031 generates a frequency-multiplied signal of the output signal of the microwave source 202, the mixer 2032 generates a frequency-mixed signal based on the output signal of the vector source 201 and the frequency-multiplied signal, and the driver amplifier 204 generates the second vector signal based on amplifying the frequency-mixed signal.
Illustratively, in some embodiments, the up-conversion unit 203 includes a frequency multiplier 2031, a mixer 2032, an isolator 206, and a driver amplifier 204, where the frequency multiplier 2031 multiplies the frequency of the signal from the microwave signal source 2021 of the power divider 2022, and mixes the multiplied frequency with the vector signal in the mixer 2032 to realize up-conversion. To prevent the signal from flowing backwards and damaging the up-converter and the vector signal source, the system is connected with an isolator 206. Since the power amplifier to be tested requires high input power, a driving amplifier 204 is also provided. The mixer 2032 mixes the output signal, and outputs a radio frequency signal after passing through the isolator 206 and the driver amplifier 204 in sequence.
The embodiment of the vector error amplitude measuring device is provided with an up-conversion unit 203 and a signal analyzer 205, and the signal degradation degree, namely frequency response data, which is used for being loaded to a measured target after the up-conversion is analyzed by the signal analyzer 205, and the signal degradation degree in the up-conversion and the down-conversion of the vector signal is corrected by the frequency response data, so that the influence of EVM degradation caused by a vector source 201 is greatly reduced, and the measurement precision of the EVM is improved. In some application scenarios, the microwave source 202 includes a microwave signal source 2021 and a power divider 2022, so that the signals are respectively sent to the up-conversion unit 203 and the down-conversion unit 208 after power is distributed as required, thereby reducing the complexity of the system, reducing the number of the adopted microwave signal sources 2021, making the up-conversion and down-conversion microwave signal sources 2021 more consistent, and making the analysis result obtained by the signal analyzer 205 more accurate.
Fig. 4 provides a schematic diagram of a second vector error magnitude measurement apparatus applied in a measurement process, fig. 5 provides a flowchart of a vector error magnitude measurement method provided by an embodiment of the present invention, and in combination with two drawings, in a second aspect, an embodiment of the present invention provides a vector error magnitude measurement method, including:
on the basis of a plurality of test points, carrying out quasi-test on the vector error amplitude measuring device to obtain a plurality of frequency response data, wherein the plurality of test points comprise different frequency points and different power points, and the vector error amplitude measuring device is not connected to a measured target in a calibration test;
generating calibration compensation data according to the plurality of frequency response data, inputting the calibration compensation data to the vector source, and calibrating the vector error amplitude measuring device;
and accessing the target to be tested to the vector error amplitude measuring device, and testing the target to be tested based on a plurality of test points to obtain vector error amplitude data, wherein the plurality of test points comprise different frequency points and different power points.
In a possible implementation manner, the testing the vector error magnitude measurement apparatus based on a plurality of test points to obtain a plurality of frequency response data includes:
for each frequency point and for each power point, the following steps are performed:
generating a first vector signal according to the frequency point and the power point;
acquiring a first vector error amplitude according to the second vector signal;
preprocessing according to the first vector error amplitude to generate a calibration file;
adding the calibration file to a calibration file database.
In a possible implementation manner, accessing the target to be tested to the vector error magnitude measurement apparatus, and testing the target to be tested based on a plurality of test points to obtain vector error magnitude data includes:
for each frequency point and for each power point, the following steps are performed:
acquiring a calibration file from a calibration file database according to the frequency point and the power point;
generating a first vector signal according to the calibration file;
acquiring a second vector error amplitude according to the second vector signal;
adding the second vector error magnitude to the vector error magnitude data.
Illustratively, taking a test method with a down-conversion unit as an example, in a specific application scenario, the signal analyzer 205 has a millimeter wave predistortion test and compensation function. The upper computer, the signal source and the signal analyzer 205 communicate through a network cable.
A radio frequency signal emitted by a vector signal source is subjected to up-conversion and power amplification to generate link distortion, a data file of the link distortion is obtained through the FSW pre-distortion measurement processing function of a frequency spectrograph to serve as calibration compensation data, and then the data file is led into the vector signal source by frequency points and power points to perform distortion calibration. The signal analyzer generates a direct predistortion DDPD file at calibration, in the format iqtar, similar to XML, and the data is DPD vector compensation including amplitude and phase frequency response correction. And a vector signal source can be introduced to carry out digital predistortion, so that the EVM is reduced.
After the calibration process is finished, the EVM of the reference surface is minimized and is close to zero through playing of the data file corrected through predistortion, connection and test of the tested target are further carried out, and the EVM value represents the performance of the tested target.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply any order of execution, and the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Fig. 6 is a functional block diagram of a terminal according to an embodiment of the present invention. As shown in fig. 6, the terminal 6 of this embodiment includes: a processor 600 and a memory 601, said memory 601 having stored therein a computer program 602 executable on said processor 600. The processor 600 executes the computer program 602 to implement the above-mentioned operation and maintenance methods and steps of the embodiments of the power metering device, such as steps 501 to 503 shown in fig. 5.
Illustratively, the computer program 602 may be partitioned into one or more modules/units that are stored in the memory 601 and executed by the processor 600 to implement the present invention.
The terminal 6 may be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The terminal 6 may include, but is not limited to, a processor 600, a memory 601. Those skilled in the art will appreciate that fig. 6 is merely an example of a terminal 6 and does not constitute a limitation of terminal 6, and may include more or fewer components than shown, or some components may be combined, or different components, e.g., the terminal may also include input-output devices, network access devices, buses, etc.
The Processor 600 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 601 may be an internal storage unit of the terminal 6, such as a hard disk or a memory of the terminal 6. The memory 601 may also be an external storage device of the terminal 6, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital Card (SD), a Flash memory Card (Flash Card) and the like provided on the terminal 6. Further, the memory 601 may also include both an internal storage unit and an external storage device of the terminal 6. The memory 601 is used for storing the computer programs and other programs and data required by the terminal. The memory 601 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit, and the integrated unit may be implemented in a form of hardware, or may be implemented in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the description of each embodiment is focused on, and for parts that are not described or recited in a certain embodiment, reference may be made to the description of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal and method may be implemented in other manners. For example, the above-described apparatus/terminal embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each of the units may exist alone physically, or two or more units may be integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method according to the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium and used by a processor to implement the steps of the embodiments of the vector error magnitude measurement method. 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, and the like.
The above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A vector error magnitude measurement apparatus, comprising:
the device comprises a microwave source, a vector source, an up-conversion unit and a signal analyzer;
the microwave source and the vector source are respectively connected with the input end of the up-conversion unit through signals;
the signal analyzer is configured to receive a second vector signal via an input and to output frequency response data indicative of the second vector signal;
the output end of the up-conversion unit is used for outputting a first vector signal, wherein the second vector signal is generated based on the first vector signal, the vector source outputs a signal according to a frequency response data table, the first vector signal is generated based on the output signal of the vector source and a frequency doubling signal of the output signal of the microwave source through frequency mixing, and the frequency response data table is generated according to a plurality of frequency response data.
2. The vector error magnitude measurement device of claim 1, further comprising:
the output end of the down-conversion unit is in signal connection with the input end of the signal analyzer;
the input end of the down-conversion unit is used for inputting a third vector signal, the output end of the down-conversion unit outputs the second vector signal, and the second vector signal is generated by down-conversion based on the third vector signal.
3. The vector error magnitude measurement device of claim 2, wherein the down-conversion unit comprises:
the input end of the down converter is in signal connection with the output end of the attenuator, and the output end of the down converter is in signal connection with the input end of the signal analyzer;
the input end of the attenuator is used for inputting the third vector signal, and the down converter performs down conversion according to the output of the attenuator to generate the second vector signal.
4. The vector error magnitude measurement device of claim 3 wherein said microwave source comprises: the microwave signal source is in signal connection with the input end of the power divider, and the output end of the power divider is in signal connection with the up-conversion unit and the down-conversion unit respectively;
the power divider is configured to distribute power to the local oscillator signal generated by the microwave signal source according to a preset value, and then transmit the local oscillator signal to the up-conversion unit and the down-conversion unit, where the up-conversion unit outputs the first vector signal based on the local oscillator signal and an output signal of the vector source, and the down-conversion unit outputs the second vector signal based on the local oscillator signal and the third vector signal.
5. The vector error magnitude measurement device of any of claims 1-4, characterized in that the up-conversion unit comprises:
the input end of the frequency multiplier is in signal connection with the output end of the microwave source, the output end of the frequency multiplier and the output end of the vector signal source are in signal connection with the input end of the frequency mixer respectively, the output end of the frequency mixer is in signal connection with the input end of the isolator, and the output end of the isolator is in signal connection with the input end of the drive amplifier;
the frequency multiplier generates a frequency multiplication signal of an output end signal of the microwave source, the mixer generates a mixing signal based on the output signal of the vector source and the frequency multiplication signal, and the driving amplifier generates the second vector signal based on amplifying the mixing signal.
6. A vector error magnitude measuring method applied to the vector error magnitude measuring apparatus according to any one of claims 1 to 5, comprising:
based on a plurality of test points, carrying out calibration test on the vector error amplitude measuring device to obtain a plurality of frequency response data, wherein the plurality of test points comprise different frequency points and different power points, and the vector error amplitude measuring device is not accessed to a measured target in the calibration test;
generating calibration compensation data according to the plurality of frequency response data, inputting the calibration compensation data to the vector source, and calibrating the vector error amplitude measuring device;
and accessing the target to be tested to the vector error amplitude measuring device, and testing the target to be tested based on a plurality of test points to obtain vector error amplitude data, wherein the plurality of test points comprise different frequency points and different power points.
7. The vector error magnitude measurement method of claim 6, wherein said testing said vector error magnitude measurement device based on a plurality of test points to obtain a plurality of frequency response data comprises:
for each frequency point and for each power point, the following steps are performed:
generating a first vector signal according to the frequency point and the power point;
acquiring a first vector error amplitude according to the second vector signal;
preprocessing according to the first vector error amplitude to generate a calibration file;
and adding the calibration file into a calibration file database.
8. The vector error magnitude measurement method of claim 6, wherein accessing the target under test to the vector error magnitude measurement device, and testing the target under test based on a plurality of test points to obtain vector error magnitude data comprises:
for each frequency point and for each power point, the following steps are performed:
acquiring a calibration file from a calibration file database according to the frequency point and the power point;
generating a first vector signal according to the calibration file;
acquiring a second vector error amplitude according to the second vector signal;
adding the second vector error magnitude to the vector error magnitude data.
9. A terminal comprising a memory and a processor, the memory having stored therein a computer program operable on the processor, wherein the processor when executing the computer program performs the steps of the method as claimed in any of claims 6 to 8.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 6 to 8.
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