Method and system for calibrating adjacent channel power leakage ratio of communication device test instrument

Abstract

The invention provides an adjacent channel power leakage ratio calibration method and calibration system of a communication device test instrument, and the calibration method comprises the steps: carrying out the calculation according to the output power of a main channel signal generator and the output power of an adjacent channel signal generator, which are measured by a power meter, and obtaining an adjacent channel power leakage ratio standard value; according to the main channel power and the adjacent channel power measured by the calibrated instrument, calculating to obtain an actual measurement value of an adjacent channel power leakage ratio; and obtaining an adjacent channel power leakage ratio calibration factor of the calibrated instrument according to the adjacent channel power leakage ratio standard value and the adjacent channel power leakage ratio measured value. According to the invention, the measurement result of the adjacent channel power leakage ratio of the calibrated instrument can be traced back to the continuous wave power, and the accuracy and consistency of the calibrated instrument for measuring the adjacent channel power leakage ratio of a communication device and an integrated circuit are improved.

Description

Technical Field

[0001] This application relates to the field of communications, and in particular, to a method and system for calibrating the adjacent channel power leakage ratio of a communication device test instrument. Background Art

[0002] In modern communication systems, the adjacent channel leakage ratio (ACLR) is an important parameter for evaluating the linearity and spectral purity of a transmitting device. In the 3GPP LTE specification, the ACLR is defined as the ratio of the filtered average power centered on the specified channel frequency to the filtered average power centered on the adjacent channel frequency, which directly reflects whether the transmitted signal maintains good "purity" within its allocated frequency range. An ideal transmitted signal should be completely concentrated within its specified frequency band, but in practical applications, due to factors such as non-linear amplifiers and modulation errors, some power may leak into adjacent frequency bands, causing potential interference to other services. To ensure the efficient operation of the communication system and avoid interference to other frequency bands, it is necessary to strictly control the ACLR value.

[0003] Generally, instruments such as spectrum analyzers, vector signal analyzers, and mobile communication comprehensive test instruments all have the function of testing the adjacent channel power leakage ratio and can be used for ACLR testing of communication devices, integrated circuits, modules, etc. These instruments calculate the ACLR by accurately capturing and analyzing the spectral characteristics of the transmitted signal, but their accuracy depends on their own performance indicators, especially their dynamic range and linearity. An ideal measurement tool should have better ACLR performance than the device under test to ensure the reliability of the measurement results.

[0004] However, in practical applications, due to the lack of an effective absolute calibration method, most existing ACLR measurements are carried out in a relative comparison manner. Although this method can ensure the consistency between different devices to a certain extent, it is difficult to achieve true traceability of the quantity value, that is, the measurement results cannot be directly traced back to the International System of Units (SI) standard or other authoritative benchmarks. This not only limits the improvement of measurement accuracy but also brings uncertainty in data comparison across systems and platforms. Summary of the Invention

[0005] This application provides a method and system for calibrating the adjacent channel power leakage ratio of a communication device test instrument to achieve the traceability of the quantity value of the adjacent channel power leakage ratio of the instrument under calibration and improve the accuracy and consistency of the measurement results of the instrument under calibration.

[0006] This application provides a method for calibrating the adjacent channel power leakage ratio of a communication device test instrument, including: Calculate the standard value of the adjacent channel power leakage ratio based on the output power of the main channel signal generator and the output power of the adjacent channel signal generator; wherein, the output power of the main channel signal generator and the output power of the adjacent channel signal generator are measured by a power meter. Keep the parameter settings of the main channel signal generator and the adjacent channel signal generator unchanged under the standard value of the adjacent channel power leakage ratio, and measure the actual value of the adjacent channel power leakage ratio; wherein, the actual value of the adjacent channel power leakage ratio is measured using the adjacent channel power leakage ratio function of the instrument to be calibrated. Obtain the calibration factor of the adjacent channel power leakage ratio of the instrument to be calibrated based on the standard value of the adjacent channel power leakage ratio and the actual value of the adjacent channel power leakage ratio.

[0007] According to the adjacent channel power leakage ratio calibration method of the communication device test instrument provided by the present application, the calculating the standard value of the adjacent channel power leakage ratio based on the output power of the main channel signal generator and the output power of the adjacent channel signal generator includes: Connect the RF output ends of the main channel signal generator and the adjacent channel signal generator to the input end of the combiner, and connect the output end of the combiner to the power meter. With the RF output of the adjacent channel signal generator turned off, set the output continuous wave frequency of the main channel signal generator, turn on the RF output of the main channel signal generator, adjust the output level of the main channel signal generator, and measure the output power of the main channel signal generator using the power meter, then turn off the RF output of the main channel signal generator. With the RF output of the main channel signal generator turned off, set the output continuous wave frequency of the adjacent channel signal generator, turn on the RF output of the adjacent channel signal generator, adjust the output level of the adjacent channel signal generator, and measure the output power of the adjacent channel signal generator using the power meter. Subtract the output power of the main channel signal generator from the output power of the adjacent channel signal generator to obtain the standard value of the adjacent channel power leakage ratio.

[0008] According to the adjacent channel power leakage ratio calibration method of the communication device test instrument provided by the present application, the relationship between the output continuous wave frequency of the adjacent channel signal generator and the output continuous wave frequency of the main channel signal generator is: , In the formula, f 1 represents the output continuous wave frequency of the main channel signal generator, f 2 represents the output continuous wave frequency of the adjacent channel signal generator, B represents the bandwidth between the main channel center frequency point and the adjacent channel center frequency point.

[0009] According to the adjacent channel power leakage ratio calibration method of the communication device test instrument provided by this application, keeping the parameter settings of the main channel signal generator and the adjacent channel signal generator unchanged under the adjacent channel power leakage ratio standard value, and measuring the actual measured value of the adjacent channel power leakage ratio, including: Connect the output end of the combiner to the RF input end of the instrument under test, and use the reference signal output by the adjacent channel signal generator as the reference input signal of the main channel signal generator and the instrument under test; In the instrument under test, select the adjacent channel power leakage ratio measurement function, and set the center frequency, main channel bandwidth, adjacent channel bandwidth, channel spacing, and sweep width; Turn on the RF outputs of the main channel signal generator and the adjacent channel signal generator, and read the actual measured value of the adjacent channel power leakage ratio in the instrument under test.

[0010] According to the adjacent channel power leakage ratio calibration method of the communication device test instrument provided by this application, it further includes: According to the factory measurement index of the adjacent channel power leakage ratio of the instrument under test, keep the output of the main channel signal generator unchanged, reduce the output level of the adjacent channel signal generator, and repeat the process of obtaining the adjacent channel power leakage ratio standard value and the actual measured value of the adjacent channel power leakage ratio.

[0011] According to the adjacent channel power leakage ratio calibration method of the communication device test instrument provided by this application, it further includes: According to the factory measurement index of the adjacent channel power leakage ratio of the instrument under test and the modulation method, adjust the output of the main channel signal generator, change the output continuous wave frequency of the main channel signal generator and the bandwidth between the main channel center frequency point and the adjacent channel center frequency point, and repeat the process of obtaining the adjacent channel power leakage ratio standard value and the actual measured value of the adjacent channel power leakage ratio.

[0012] According to the adjacent channel power leakage ratio calibration method of the communication device test instrument provided by this application, the relationship between the main channel bandwidth, adjacent channel bandwidth, channel spacing, and the bandwidth between the main channel center frequency point and the adjacent channel center frequency point is: B3 + B1 / 2 + B2 / 2 = B, where B1 represents the main channel bandwidth, B2 represents the adjacent channel bandwidth, B3 represents the channel spacing, and B represents the bandwidth between the main channel center frequency point and the adjacent channel center frequency point; The sweep width is 2 to 3 times the bandwidth between the main channel center frequency point and the adjacent channel center frequency point.

[0013] This application also provides an adjacent channel power leakage ratio calibration system for a communication device test instrument, which includes: A main channel signal generator, an adjacent channel signal generator, a power meter, and an instrument under test. Among them, the RF output terminals of the main channel signal generator and the adjacent channel signal generator are both connected to the input terminal of a combiner, and the output terminal of the combiner is connected to the power meter or the instrument under test; With the RF output of the adjacent channel signal generator turned off, adjust the output level of the main channel signal generator, and use the power meter to measure the output power of the main channel signal generator; with the RF output of the main channel signal generator turned off, adjust the output level of the adjacent channel signal generator, and use the power meter to measure the output power of the adjacent channel signal generator; based on the output power of the main channel signal generator and the output power of the adjacent channel signal generator, calculate the standard value of the adjacent channel power leakage ratio; With the RF outputs of both the main channel signal generator and the adjacent channel signal generator turned on, keep the parameter settings of the main channel signal generator and the adjacent channel signal generator unchanged under the standard value of the adjacent channel power leakage ratio, and use the instrument under test to measure the measured value of the adjacent channel power leakage ratio; Based on the standard value of the adjacent channel power leakage ratio and the measured value of the adjacent channel power leakage ratio, calculate the calibration factor of the adjacent channel power leakage ratio of the instrument under test.

[0014] According to the adjacent channel power leakage ratio calibration system of the communication device test instrument provided by the present application, select the adjacent channel power leakage ratio measurement function in the instrument under test, and set the center frequency, main channel bandwidth, adjacent channel bandwidth, channel spacing, and sweep width.

[0015] According to the adjacent channel power leakage ratio calibration system of the communication device test instrument provided by the present application, the relationship between the main channel bandwidth, adjacent channel bandwidth, and channel spacing and the bandwidth between the main channel center frequency point and the adjacent channel center frequency point is: B3 + B1 / 2 + B2 / 2 = B, where B1 represents the main channel bandwidth, B2 represents the adjacent channel bandwidth, B3 represents the channel spacing, and B represents the bandwidth between the main channel center frequency point and the adjacent channel center frequency point; The sweep width is 2 to 3 times the bandwidth between the main channel center frequency point and the adjacent channel center frequency point.

[0016] A method for calibrating the adjacent channel power leakage ratio of a communication device test instrument provided by the present application can adjust another signal generator by turning off the RF output of one signal generator respectively, which can eliminate the interference factors when the two work simultaneously, accurately focus on a single channel, and thus accurately measure the output power of the main channel signal generator and the output power of the adjacent channel signal generator, and then obtain the standard value of the adjacent channel power leakage ratio, trace the adjacent channel power leakage ratio to the single-frequency continuous wave power; by turning on the RF outputs of the main channel signal generator and the adjacent channel signal generator at the same time, multiple signals act on the environment where the instrument to be calibrated is located, simulating the situation of coexistence of multiple signals in the actual communication scenario, and calculating the measured value of the adjacent channel power leakage ratio by obtaining the main channel power and the adjacent channel power at this time, which can accurately understand the actual degree of interference between signals generated by different signal sources; furthermore, it is convenient for users to calibrate instruments such as spectrum analyzers, vector signal analyzers, and mobile communication comprehensive test instruments with the function of measuring the adjacent channel power leakage ratio according to the calibration factor obtained from the standard value of the adjacent channel power leakage ratio and the measured value of the adjacent channel power leakage ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 is a flowchart of the method for calibrating the adjacent channel power leakage ratio provided by the present application; Figure 2 is a flowchart of step S100 in the method for calibrating the adjacent channel power leakage ratio provided by the present application; Figure 3 is a flowchart of step S200 in the method for calibrating the adjacent channel power leakage ratio provided by the present application; Figure 4 is one of the structural block diagrams of the adjacent channel power leakage ratio calibration system provided by the present application; Figure 5 is the second structural block diagram of the adjacent channel power leakage ratio calibration system provided by the present application.

[0019] REFERENCE SIGNS: 1, main channel signal generator; 2, adjacent channel signal generator; 3, combiner; 4, power meter; 5, instrument to be calibrated. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following will clearly and completely describe the technical solutions in this application in conjunction with the accompanying drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts belong to the scope of protection of this application.

[0021] The adjacent channel power leakage ratio calibration method and calibration system provided by this application can be used to calibrate key transmitting components in wireless communication devices and test instruments for evaluating the performance of wireless communication systems and their components. Among them, for example, key transmitting components in wireless communication devices include power amplifiers, RF front-end modules, transmitters, etc., and test instruments for evaluating the performance of wireless communication systems and their components include spectrum analyzers, vector signal analyzers, mobile communication comprehensive test instruments, etc.

[0022] Professional test instruments such as spectrum analyzers, vector signal analyzers, and mobile communication comprehensive test instruments themselves also need to undergo strict ACLR calibration to ensure that the measurement results they provide have high precision and traceability. There may be slight differences between test instruments of different brands or models, and the measurement consistency between these devices can be improved through standardized ACLR calibration methods.

[0023] The following will be combined with Figure 1 Describe the adjacent channel power leakage ratio calibration method of the communication device test instrument provided by this application.

[0024] As Figure 1 shown, the adjacent channel power leakage ratio calibration method of the communication device test instrument provided by this application can be used to calibrate the adjacent channel power leakage ratio of the communication device test instrument, and it includes: S100. Calculate the standard value of the adjacent channel power leakage ratio according to the output power of the main channel signal generator and the output power of the adjacent channel signal generator; among them, the output power of the main channel signal generator and the output power of the adjacent channel signal generator are measured by a power meter. In the embodiments of this application, a power meter is an instrument for measuring the power of an electrical signal, and it can accurately detect the power magnitude of the input signal. Its working principle is usually based on converting the input radio frequency (RF) or electrical signal of other frequency bands. For example, through specific sensors (such as thermistors, diodes, etc.), the signal power is converted into measurable physical quantities (such as heat changes, current or voltage changes, etc.), and then through internal calibration and calculation circuits, the power value of the measured signal is finally displayed in appropriate units (such as watts, decibel milliwatts, etc.).

[0025] The main channel power refers to the power magnitude of the signal within its predefined and normally operating channel. For example, in wireless communication, if a communication system operates in a specific frequency band as the main channel, then the power carrying the useful signal within this frequency band is the main channel power, which can be measured in watts (W) or decibel-milliwatts (dBm).

[0026] The adjacent channel power refers to the power leaking into the channels adjacent to the main channel. Since the actual signal emission, transmission, etc. are not ideal situations, part of the power will leak into the adjacent channels, causing interference to the ongoing communication in the adjacent channels. The adjacent channel power can also be measured in watts (W) or decibel-milliwatts (dBm).

[0027] Based on the output power of the main channel signal generator and the output power of the adjacent channel signal generator measured by the power meter, the standard value of the adjacent channel power leakage ratio is calculated, enabling the measurement result of the adjacent channel power leakage ratio to be accurately traced back to the power meter. Based on the high-precision measurement ability and calibration traceability system of the power meter, the accuracy and reliability of the output power values of the main channel signal generator and the adjacent channel signal generator obtained are ensured. Furthermore, a credible data basis is provided for the calculation of the standard value of the adjacent channel power leakage ratio, making the entire evaluation process rigorous in terms of measurement traceability, traceable to the basic measurement values provided by the power meter, the source instrument, and providing strong support for subsequent communication system performance analysis, interference control, and compliance standard judgment, etc.

[0028] S200. Keep the parameter settings of the main channel signal generator and the adjacent channel signal generator unchanged under the standard value of the adjacent channel power leakage ratio, and measure the measured value of the adjacent channel power leakage ratio; among them, the measured value of the adjacent channel power leakage ratio is measured using the adjacent channel power leakage ratio function of the instrument to be calibrated.

[0029] In the embodiments of the present application, the main channel power refers to the power magnitude of the signal contained within a specific communication channel. For example, in wireless communication, in order to transmit information, different frequency bands are divided as channels, and the total effective signal power carried within the specified channel frequency band range is the channel power. It reflects the power situation of the part expected to transmit useful information and can be measured in watts (W) or decibel-milliwatts (dBm).

[0030] The adjacent channel power refers to the power magnitude falling within the adjacent channels (the frequency bands adjacent to the main channel of interest). Since in the actual signal transmission process, the signal cannot be completely restricted within the specified main channel, there will always be a part of the power leaking into the adjacent channels, and this part of the power leaking into the adjacent channels is the adjacent channel power, which can also be measured in watts (W) or decibel-milliwatts (dBm).

[0031] By obtaining the measured value of the adjacent channel power leakage ratio, it has important and positive technical effects for evaluating signal quality, optimizing the performance of communication systems, and ensuring the compatibility and compliance of communication systems, etc., which helps to promote the healthy and efficient development of the communication industry.

[0032] S300. Obtain the adjacent channel power leakage ratio calibration factor of the instrument to be calibrated according to the standard value and the measured value of the adjacent channel power leakage ratio.

[0033] The method for calibrating the adjacent channel power leakage ratio of the communication device test instrument provided by this application further includes: S400. According to the measured factory index of the adjacent channel power leakage ratio of the instrument to be calibrated, keep the output of the main channel signal generator unchanged, reduce the output level of the adjacent channel signal generator, and repeat steps S100 to S300 to calibrate the adjacent channel power leakage ratios of different levels.

[0034] S500. According to the measured factory index of the adjacent channel power leakage ratio of the instrument to be calibrated and the modulation method, adjust the output of the main channel signal generator and change the continuous wave frequency of the output of the main channel signal generator f 1 and the bandwidth B between the center frequency of the main channel and the center frequency of the adjacent channel, and repeat steps S100 to S400.

[0035] In the above step S100, as Figure 2 shown, the process of obtaining the standard value of the adjacent channel power leakage ratio according to the main channel power and the adjacent channel power output by the power meter is as follows: S110. Connect the RF output ends of the main channel signal generator and the adjacent channel signal generator to the input end of the combiner, and connect the output end of the combiner to the power meter.

[0036] S120. With the RF output of the adjacent channel signal generator turned off, set the continuous wave frequency output by the main channel signal generator to f 1, turn on the RF output of the main channel signal generator, adjust the output level of the main channel signal generator, measure the output power P1 of the main channel signal generator using the power meter, and turn off the RF output of the main channel signal generator.

[0037] Among them, the link connecting the main channel signal generator and the power meter constitutes the main channel.

[0038] S130. With the RF output of the main channel signal generator turned off, set the continuous wave frequency output by the adjacent channel signal generator to f 2, turn on the RF output of the adjacent channel signal generator, adjust the output level of the adjacent channel signal generator, and measure the output power P2 of the adjacent channel signal generator using the power meter.

[0039] Among them, the continuous wave frequency output by the adjacent channel signal generator f 2 and the continuous wave frequency output by the main channel signal generator f 1 have the following relationship: , Among them, B represents the bandwidth between the center frequency of the main channel and the center frequency of the adjacent channel.

[0040] The link connecting the adjacent channel signal generator and the power meter forms an adjacent channel.

[0041] S140. According to the output power P1 of the main channel signal generator and the output power P2 of the adjacent channel signal generator, the standard value of the adjacent channel power leakage ratio is obtained as ACLR r = P1 - P2.

[0042] In the embodiment of the present application, by separately turning off the RF output of one signal generator to adjust the other signal generator, the factors of mutual interference when the two work simultaneously can be excluded, and the focus can be accurately on a single channel, so as to accurately measure the output power of the main channel signal generator and the output power of the adjacent channel signal generator, providing reliable basic data for subsequent calculations. The adjacent channel power leakage ratio is a key indicator for measuring the channel condition of a communication system. By obtaining the corresponding power in the above manner and calculating the standard value, the leakage degree of the signal from the main channel to the adjacent channel can be clearly judged.

[0043] In the above step S200, as Figure 3 shown, while keeping the parameter settings of the main channel signal generator and the adjacent channel signal generator unchanged under the standard value of the adjacent channel power leakage ratio, the process of measuring the measured value of the adjacent channel power leakage ratio is as follows: S210. Connect the output end of the combiner to the RF input end of the instrument under test, and use the 10 MHz reference signal output by the adjacent channel signal generator as the reference input signal for the main channel signal generator and the instrument under test.

[0044] S220. Select the adjacent channel power leakage ratio measurement function in the instrument under test, and set the center frequency f 1, the main channel bandwidth B1, the adjacent channel bandwidth B2, and the channel spacing B3, and set an appropriate sweep width, with the reference level being automatic. Among them, the sweep width can be 2 to 3 times the bandwidth B between the center frequency of the main channel and the center frequency of the adjacent channel.

[0045] Specifically, the relationship between the main channel bandwidth B1, the adjacent channel bandwidth B2, and the channel spacing B3 and the bandwidth B between the center frequency of the main channel and the center frequency of the adjacent channel is: B3 + B1 / 2 + B2 / 2 = B.

[0046] S230. Turn on the RF outputs of the main channel signal generator and the adjacent channel signal generator, and read the main channel power P in the instrument under test. c and the adjacent channel power P aj and the measured value of the adjacent channel power leakage ratio is ACLR m .

[0047] Among them, the measured value of the adjacent channel power leakage ratio is ACLR m = P c - P aj .

[0048] When the RF outputs of both the main channel signal generator and the adjacent channel signal generator are turned on, it means that multiple signals act on the environment where the instrument under test is located, simulating the situation of coexistence of multiple signals in an actual communication scenario. By obtaining the main channel power and the adjacent channel power at this time to calculate the measured value of the adjacent channel power leakage ratio, the actual degree of interference between signals generated by different signal sources can be accurately understood. For example, in the coverage area of a complex wireless communication base station, multiple base stations or signals of different frequency bands may be transmitted simultaneously, and there may be similar adjacent channel interference problems between them. With the help of such measured values, it can be clearly known how strong the interference of a specific signal on other signals on its adjacent channels is in the case of multi-signal concurrency, which helps to judge whether the accurate transmission of the information carried by different signal sources will be affected due to this leakage interference.

[0049] In a multi-signal environment, accurate measured values of the adjacent channel power leakage ratio help to quickly locate the interference source and the specific frequency band affected. If it is measured that a relatively high adjacent channel power leakage ratio appears in the channel monitored by a certain instrument under test, by comparing the relevant parameters of different signal generators and the corresponding channel and adjacent channel conditions, it can be determined which signal generator's signal causes greater interference to this channel and which adjacent frequency bands are affected. This is very crucial for subsequently taking targeted measures such as adjusting the transmission parameters of the interference source and changing the signal frequency band allocation to improve the overall communication environment.

[0050] The following uses a specific embodiment to illustrate the adjacent channel power leakage ratio calibration method provided by this application. Among them, the instrument under test uses a signal analyzer under test.

[0051] Connect the RF output ends of the main channel signal generator and the adjacent channel signal generator to the input end of the combiner, and connect the output end of the combiner to the power meter.

[0052] With the RF output of the adjacent channel signal generator turned off, set the continuous wave frequency output by the main channel signal generator to f 1 =At 800 MHz, turn on the RF output of the main channel signal generator, adjust the output level of the main channel signal generator, measure the output power P1 = -10 dBm of the main channel signal generator using a power meter, and turn off the RF output of the main channel signal generator.

[0053] With the RF output of the main channel signal generator turned off, set the continuous wave frequency output of the adjacent channel signal generator to f 2 = 797.5 MHz, turn on the RF output of the adjacent channel signal generator, adjust the output level of the adjacent channel signal generator, and measure the output power P2 = -20 dBm of the adjacent channel signal generator using a power meter.

[0054] Obtain the standard value of the adjacent channel power leakage ratio as ACLR based on P1 and P2 r = 10 dBm.

[0055] Connect the output end of the combiner to the RF input end of the signal analyzer under test, and use the 10 MHz reference signal output by the adjacent channel signal generator as the reference input signal for the main channel signal generator and the signal analyzer under test.

[0056] Select the adjacent channel power leakage ratio measurement function in the signal analyzer under test, set the center frequency to 800 MHz, the main channel bandwidth to 100 kHz, the adjacent channel bandwidth to 100 kHz, the channel spacing to 2.4 MHz, the sweep width to 10 MHz, and the reference level to automatic.

[0057] Turn on the RF outputs of the main channel signal generator and the adjacent channel signal generator, and read the main channel power P c 、adjacent channel power P aj and the measured value of the adjacent channel power leakage ratio ACLR m .

[0058] Among them, the measured value of the adjacent channel power leakage ratio is ACLR m =P c -P aj .

[0059] According to the factory index of the adjacent channel power leakage ratio measurement of the instrument under test, keep the output of the main channel signal generator unchanged, reduce the output level of the adjacent channel signal generator, and repeat the above steps to calibrate the adjacent channel power leakage ratios of different levels.

[0060] Based on the same inventive concept, as Figure 4 shown, the present application also provides an adjacent channel power leakage ratio calibration system for a communication device test instrument, including: A main channel signal generator 1, an adjacent channel signal generator 2, a power meter 4, and an instrument under test 5. Among them, the RF output ends of the main channel signal generator 1 and the adjacent channel signal generator 2 are both connected to the input end of a combiner 3, and the output end of the combiner 3 is connected to the power meter 4 or the instrument under test 5.

[0061] With the RF output of the adjacent channel signal generator 2 turned off, adjust the output level of the main channel signal generator 1, and use the power meter 4 to measure the output power of the main channel signal generator 1; with the RF output of the main channel signal generator 1 turned off, adjust the output level of the adjacent channel signal generator 2, and use the power meter 4 to measure the output power of the adjacent channel signal generator 2; obtain the standard value of the adjacent channel power leakage ratio based on the main channel power and the adjacent channel power.

[0062] With the RF outputs of both the main channel signal generator 1 and the adjacent channel signal generator 2 turned on, keep the parameter settings of the main channel signal generator and the adjacent channel signal generator under the standard value of the adjacent channel power leakage ratio unchanged, and obtain the measured values of the main channel power, the adjacent channel power, and the adjacent channel power leakage ratio in the instrument under test 5.

[0063] Among them, as Figure 5 shown, more than one main channel signal generator 1 and more than one adjacent channel signal generator 2 can be set. Specifically, each main channel signal generator 1 is represented by , and each adjacent channel signal generator 2 is represented by , where . n represents the number of signal generators. The reference input end of the signal generator is connected to the reference output end of the signal generator , the reference output end of the signal generator is connected to the reference input end of the signal generator , the reference output end of the signal generator is connected to the reference input end of the signal generator , the reference input end of the signal generator is connected to the reference output end of the signal generator , the reference output end of the signal generator is connected to the reference input end of the signal generator , and the reference output end of the signal generator is connected to the reference input end of the instrument under test.

[0064] The RF output ends of the signal generators are all connected to the input end of a first combiner, and the signal generators The RF output ends are all connected to the input end of the second combiner. The output end of the first combiner and the output end of the second combiner are both connected to the input end of the third combiner. The input end of the third combiner is connected to the RF input end of the power meter or the instrument under calibration.

[0065] The calibration process using this adjacent channel power leakage ratio calibration system is as follows: S10. Assume that the center frequency of the main channel is , the center frequency of the adjacent channel is , the bandwidth of the main channel is B1, the bandwidth of the adjacent channel is B2, the channel spacing is B3, and the bandwidth from the center frequency of the main channel to the center frequency of the adjacent channel is . Uniformly select n frequency points within the main channel, and these frequency points are symmetric about the center frequency of the main channel. Similarly, uniformly select n frequency points within the adjacent channel, and these frequency points are symmetric about the center frequency of the adjacent channel.

[0066] S20. Set the output continuous wave frequency of the main channel signal generator to . Connect the output end of the combiner to the power meter, turn on the RF output, adjust the output level of the signal source so that the power meter shows , and turn off the RF output.

[0067] Similarly, repeat n times. Set the output continuous wave frequency of the main channel signal generator to . Connect the output end of the combiner to the power meter, turn on the RF output, adjust the output level of the signal source so that the power meter shows , and turn off the RF output.

[0068] S30. Set the output continuous wave frequency of the adjacent channel signal generator to , and meet the requirement:

[0069] Turn on the RF output of the adjacent channel signal generator , adjust the output level of the signal source so that the power meter shows , and turn off the RF output.

[0070] Similarly, repeat n times. Set the output continuous wave frequency of the adjacent channel signal generator to , and meet the requirement:

[0071] Turn on the RF output of the adjacent channel signal generator RF output. Adjust the output level of the signal source so that the power meter shows , and turn off the RF output.

[0072] S40. The main channel power is , and the adjacent channel power is . The adjacent channel power leakage ratio to the standard value is .

[0073] S50. Connect each main channel signal generator and adjacent channel signal generator to the input end of the combiner, connect the output end of the combiner to the RF input end of the signal analyzer under test. The signal analyzer under test selects the adjacent channel power leakage ratio measurement function, and sets the center frequency to , set the main channel bandwidth B1, adjacent channel bandwidth B2, set the channel spacing B3, set an appropriate sweep width (2 - 3 B ), and set the reference level to automatic.

[0074] S60. Turn on the RF outputs of all main channel signal generators and adjacent channel signal generators, and read and record the main channel power as in the signal analyzer under test, read and record the adjacent channel power as . The measured value of the adjacent channel power leakage ratio is .

[0075] S70. Reduce the output level of the adjacent channel signal generator, and repeat steps S30 - S60.

[0076] S80. Change the main channel center frequency and bandwidth B , and repeat the above steps S10 - S70.

[0077] In other embodiments, the adjacent channel power leakage ratio calibration system of the communication device test instrument provided by this application further includes: According to the factory measurement index of the adjacent channel power leakage ratio of the instrument under test 5, keep the output of the main channel signal generator 1 unchanged, reduce the output level of the adjacent channel signal generator 2, and repeat the process of obtaining the standard value of the adjacent channel power leakage ratio and the measured value of the adjacent channel power leakage ratio; and According to the factory measurement index of the adjacent channel power leakage ratio of the instrument under test 5 and the modulation method, adjust the output of the main channel signal generator 1, change the continuous wave frequency of the output of the main channel signal generator 1 and the bandwidth between the main channel center frequency and the adjacent channel center frequency, and repeat the process of obtaining the standard value of the adjacent channel power leakage ratio and the measured value of the adjacent channel power leakage ratio.

[0078] Before obtaining the main channel power and adjacent channel power in the instrument under test 5, it further includes selecting the adjacent channel power leakage ratio measurement function in the instrument under test 5, and setting the center frequency, main channel bandwidth, adjacent channel bandwidth, channel spacing and sweep width.

[0079] Among them, the relationship between the main channel bandwidth, adjacent channel bandwidth, and channel spacing and the bandwidth between the center frequency point of the main channel and the center frequency point of the adjacent channel is: B3 + B1 / 2 + B2 / 2 = B, where B1 represents the main channel bandwidth, B2 represents the adjacent channel bandwidth, B3 represents the channel spacing, and B represents the bandwidth between the center frequency point of the main channel and the center frequency point of the adjacent channel; The sweep width is 2 to 3 times the bandwidth B between the center frequency point of the main channel and the center frequency point of the adjacent channel.

[0080] Based on the adjacent channel power leakage ratio standard value and the measured value of the adjacent channel power leakage ratio of the communication device test instrument obtained according to this application, a calibration factor can be obtained. Among them, the calibration factor is a key parameter used to calibrate and adjust the instrument or related communication equipment. It reflects the degree of difference between the actual measured value and the standard required value. Through the calibration factor, the device can be corrected accordingly to make its performance more in line with the standard specifications, thereby improving measurement accuracy or signal transmission quality, etc. In the scenario of the adjacent channel power leakage ratio index, the calibration factor is determined based on the standard value and the measured value of the ACLR, aiming to eliminate the deviation between the two and ensure that the device reaches an ideal performance state in terms of adjacent channel power leakage.

[0081] When the user calibrates the adjacent channel power leakage ratio of the instrument to be calibrated, the standard value of the adjacent channel power leakage ratio of the instrument to be calibrated can be obtained according to the measured value of the adjacent channel power leakage ratio and the above calibration factor. Furthermore, corresponding calibration measures can be taken according to the difference between the standard value and the measured value of the adjacent channel power leakage ratio to adjust the instrument to be calibrated. For example, adjusting the power output of the instrument to be calibrated, optimizing the internal filter circuit, etc., to make the measured value closer to the standard value, so as to ensure that the performance of the instrument to be calibrated in terms of adjacent channel power leakage meets the corresponding requirements, ensure its accurate and stable operation in communication and other application scenarios, avoid excessive interference to adjacent channels, and ensure that the performance of the instrument to be calibrated meets the established standard specifications.

[0082] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative labor.

[0083] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for calibrating adjacent channel power leakage ratio of a communication device test instrument, characterized in that: include: The adjacent channel power leakage ratio standard value is calculated according to the output power of the main channel signal generator and the output power of the adjacent channel signal generator; wherein the output power of the main channel signal generator and the output power of the adjacent channel signal generator are measured by a power meter; Keep the parameter settings of the main channel signal generator and the adjacent channel signal generator unchanged under the adjacent channel power leakage ratio standard value, and measure to obtain the measured value of the adjacent channel power leakage ratio; wherein the measured value of the adjacent channel power leakage ratio is measured using the adjacent channel power leakage ratio function of the instrument being calibrated; According to the adjacent channel power leakage ratio standard value and the adjacent channel power leakage ratio measured value, the adjacent channel power leakage ratio calibration factor of the calibrated instrument is obtained.

2. The method according to claim 1, characterized in that The step of calculating the adjacent channel power leakage ratio standard value according to the output power of the main channel signal generator and the output power of the adjacent channel signal generator comprises: Connect the RF output ends of the main channel signal generator and the adjacent channel signal generator to the input end of the combiner, and connect the output end of the combiner to the power meter; When the RF output of the adjacent channel signal generator is turned off, the output continuous wave frequency of the main channel signal generator is set, the RF output of the main channel signal generator is turned on, the output level of the main channel signal generator is adjusted, the output power of the main channel signal generator is measured using a power meter, and the RF output of the main channel signal generator is turned off; When the RF output of the main channel signal generator is turned off, the output continuous wave frequency of the adjacent channel signal generator is set, the RF output of the adjacent channel signal generator is turned on, the output level of the adjacent channel signal generator is adjusted, and the output power of the adjacent channel signal generator is measured using a power meter; The output power of the main channel signal generator is subtracted from the output power of the adjacent channel signal generator to obtain the standard value of the adjacent channel power leakage ratio.

3. The method according to claim 2, characterized in that The relationship between the output continuous wave frequency of the adjacent channel signal generator and the output continuous wave frequency of the main channel signal generator is: ， In the formula, f 1 represents the output continuous wave frequency of the main channel signal generator, f 2 represents the output continuous wave frequency of the adjacent channel signal generator, B Indicates the bandwidth of the main channel center frequency from the adjacent channel center frequency.

4. The method according to claim 1, characterized in that: The method of maintaining the parameter settings of the main channel signal generator and the adjacent channel signal generator under the adjacent channel power leakage ratio standard value unchanged and measuring to obtain the adjacent channel power leakage ratio measured value includes: Connect the output end of the combiner to the RF input end of the instrument to be calibrated, and use the reference signal output by the adjacent channel signal generator as the reference input signal of the main channel signal generator and the instrument to be calibrated; In the instrument to be calibrated, select the adjacent channel power leakage ratio measurement function, and set the center frequency, main channel bandwidth, adjacent channel bandwidth, channel spacing, and span; Turn on the RF output of the main channel signal generator and the adjacent channel signal generator, and read the measured value of the adjacent channel power leakage ratio in the instrument being calibrated.

5. The method according to claim 4, characterized in that Also includes: According to the adjacent channel power leakage ratio measurement factory index of the calibrated instrument, keep the output of the main channel signal generator unchanged, reduce the output level of the adjacent channel signal generator, and repeat the process of obtaining the adjacent channel power leakage ratio standard value and the adjacent channel power leakage ratio measured value.

6. The method according to claim 5, characterized in that Also includes: According to the adjacent channel power leakage ratio measurement factory indicators and modulation method of the calibrated instrument, adjust the output of the main channel signal generator, change the output continuous wave frequency of the main channel signal generator and the bandwidth of the main channel center frequency from the adjacent channel center frequency, and repeat the process of obtaining the adjacent channel power leakage ratio standard value and the adjacent channel power leakage ratio measured value.

7. The method according to claim 4, characterized in that The relationship between the main channel bandwidth, the adjacent channel bandwidth and the channel spacing and the bandwidth of the main channel center frequency point from the adjacent channel center frequency point is: B3+B1 / 2+B2 / 2=B Among them, B1 represents the main channel bandwidth, B2 represents the adjacent channel bandwidth, B3 represents the channel spacing, and B represents the bandwidth from the center frequency of the main channel to the center frequency of the adjacent channel; The span is 2 to 3 times the bandwidth of the distance between the center frequency of the main channel and the center frequency of the adjacent channel.

8. A communication device test instrument adjacent channel power leakage ratio calibration system, characterized in that: include: A main channel signal generator, an adjacent channel signal generator, a power meter and an instrument to be calibrated, wherein the RF output ends of the main channel signal generator and the adjacent channel signal generator are both connected to the input end of a combiner, and the output end of the combiner is connected to the power meter or the instrument to be calibrated; When the RF output of the adjacent channel signal generator is turned off, the output level of the main channel signal generator is adjusted, and the output power of the main channel signal generator is measured by a power meter; when the RF output of the main channel signal generator is turned off, the output level of the adjacent channel signal generator is adjusted, and the output power of the adjacent channel signal generator is measured by a power meter; according to the output power of the main channel signal generator and the output power of the adjacent channel signal generator, a standard value of the adjacent channel power leakage ratio is calculated; When the RF outputs of the main channel signal generator and the adjacent channel signal generator are both turned on, the parameter settings of the main channel signal generator and the adjacent channel signal generator under the adjacent channel power leakage ratio standard value are kept unchanged, and the adjacent channel power leakage ratio actual value is measured by using the calibrated instrument; According to the adjacent channel power leakage ratio standard value and the adjacent channel power leakage ratio measured value, the adjacent channel power leakage ratio calibration factor of the calibrated instrument is calculated.

9. The system according to claim 8, characterized in that The adjacent channel power leakage ratio measurement function is selected in the calibrated instrument, and the center frequency, main channel bandwidth, adjacent channel bandwidth, channel spacing and span are set.

10. The system according to claim 9, characterized in that The relationship between the main channel bandwidth, the adjacent channel bandwidth and the channel spacing and the bandwidth of the main channel center frequency point from the adjacent channel center frequency point is: B3+B1 / 2+B2 / 2=B, Among them, B1 represents the main channel bandwidth, B2 represents the adjacent channel bandwidth, B3 represents the channel spacing, and B represents the bandwidth from the center frequency of the main channel to the center frequency of the adjacent channel; The span is 2 to 3 times the bandwidth of the distance between the center frequency of the main channel and the center frequency of the adjacent channel.

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