Adjacent channel power leakage ratio calibration method and calibration system for communication device test instruments

Abstract

This application provides a calibration method and system for calibrating the adjacent channel power leakage ratio of a test instrument for communication devices. The calibration method includes calculating a standard value for 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 measured by a power meter; calculating the measured value of the adjacent channel power leakage ratio based on the main channel power and adjacent channel power measured by the instrument under test; and obtaining the adjacent channel power leakage ratio calibration factor of the instrument under test based on the standard value and the measured value. This application enables the measurement results of the adjacent channel power leakage ratio of the instrument under test to be traced back to continuous wave power, improving the accuracy and consistency of the measurement of the adjacent channel power leakage ratio of communication devices and integrated circuits by the instrument under test.

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 test instrument for communication devices. Background Technology

[0002] In modern communication systems, the Adjacent Channel Leakage Ratio (ACLR) is a crucial parameter for evaluating the linearity and spectral purity of transmitting equipment. In the 3GPP LTE specification, ACLR is defined as the ratio of the average filtered power centered on a specified channel frequency to the average filtered power centered on adjacent channel frequencies. It directly reflects whether the transmitted signal maintains good "purity" within its allocated frequency range. Ideally, the transmitted signal should be completely concentrated within its designated frequency band. However, in practical applications, due to factors such as nonlinear 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 with other frequency bands, the ACLR value must be strictly controlled.

[0003] Instruments such as spectrum analyzers, vector signal analyzers, and mobile communication integrated testers typically have ACLR (Advanced Channel Limiting Ratio) testing capabilities and can be used for ACLR testing of communication devices, integrated circuits, and modules. These instruments calculate ACLR by accurately capturing and analyzing the spectral characteristics of the transmitted signal; however, their accuracy depends on their performance specifications, particularly their dynamic range and linearity. An ideal measurement tool should possess ACLR performance superior to that of the object under test to ensure the reliability of the measurement results.

[0004] However, in practical applications, due to the lack of effective absolute calibration methods, most existing ACLR measurements are performed using relative comparison methods. While this method can ensure consistency between different devices to a certain extent, it is difficult to achieve true traceability of measurement values, meaning that 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 introduces uncertainty when comparing data across systems and platforms. Summary of the Invention

[0005] This application provides a calibration method and system for calibrating the adjacent channel power leakage ratio of a test instrument for communication devices, so as to realize the traceability 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 test instrument for communication devices, including:

[0007] The standard value of the adjacent channel power leakage ratio is calculated 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 obtained by measuring with a power meter;

[0008] Keeping the parameter settings of the main channel signal generator and the adjacent channel signal generator unchanged under the standard value of adjacent channel power leakage ratio, the measured value of adjacent channel power leakage ratio is obtained; wherein, the measured value of adjacent channel power leakage ratio is obtained by using the adjacent channel power leakage ratio function of the instrument being calibrated;

[0009] The adjacent channel power leakage ratio calibration factor is obtained based on the standard value of adjacent channel power leakage ratio and the measured value of adjacent channel power leakage ratio.

[0010] According to the adjacent channel power leakage ratio calibration method for communication device test instruments provided in this application, the step of calculating the adjacent channel power leakage ratio standard value based on the output power of the main channel signal generator and the output power of the adjacent channel signal generator includes:

[0011] Connect the RF outputs of the main channel signal generator and the adjacent channel signal generator to the input of the combiner, and connect the output of the combiner to the power meter;

[0012] 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, measure the output power of the main channel signal generator using a power meter, and then turn off the RF output of the main channel signal generator.

[0013] With the RF output of the main channel signal generator turned off, the output continuous wave frequency of the adjacent channel signal generator was set, the RF output of the adjacent channel signal generator was turned on, the output level of the adjacent channel signal generator was adjusted, and the output power of the adjacent channel signal generator was measured using a power meter.

[0014] The standard value of the adjacent channel power leakage ratio is obtained by subtracting the output power of the main channel signal generator from the output power of the adjacent channel signal generator.

[0015] According to the adjacent channel power leakage ratio calibration method of the communication device test instrument provided in this 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 as follows:

[0016] ,

[0017] In the formula, f 1 indicates the output continuous wave frequency of the main channel signal generator. f 2 indicates the output continuous wave frequency of the adjacent channel signal generator.B This represents the bandwidth between the center frequency of the main channel and the center frequency of the adjacent channel.

[0018] According to the adjacent channel power leakage ratio calibration method for communication device test instruments provided in this application, the step of 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, and measuring the measured value of the adjacent channel power leakage ratio, includes:

[0019] Connect the output of the combiner to the RF input of the instrument being calibrated, and use the reference signal output from the adjacent channel signal generator as the reference input signal between the main channel signal generator and the instrument being calibrated.

[0020] In the instrument being calibrated, 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;

[0021] Turn on the RF outputs 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.

[0022] The adjacent channel power leakage ratio calibration method for communication device test instruments provided in this application also includes:

[0023] Based on the factory specifications for the adjacent channel power leakage ratio of the instrument being calibrated, the output of the main channel signal generator is kept constant, while the output level of the adjacent channel signal generator is reduced. This process is repeated to obtain the standard value and the measured value of the adjacent channel power leakage ratio.

[0024] The adjacent channel power leakage ratio calibration method for communication device test instruments provided in this application also includes:

[0025] Based on the factory specifications for adjacent channel power leakage ratio of the instrument being calibrated and the modulation method, the output of the main channel signal generator is adjusted, and the output continuous wave frequency of the main channel signal generator and the bandwidth between the center frequency of the main channel and the center frequency of the adjacent channel are changed. The process of obtaining the standard value and the measured value of adjacent channel power leakage ratio is repeated.

[0026] According to the adjacent channel power leakage ratio calibration method of the communication device test instrument provided in this application, the relationship between the main channel bandwidth, adjacent channel bandwidth, and channel spacing and the bandwidth of the main channel center frequency point from the adjacent channel center frequency point is as follows:

[0027] B3 + B1 / 2 + B2 / 2 = B,

[0028] Wherein, 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 of the main channel and the center frequency of the adjacent channel.

[0029] The sweep width is 2 to 3 times the bandwidth between the center frequency of the main channel and the center frequency of the adjacent channel.

[0030] This application also provides an adjacent channel power leakage ratio calibration system for communication device test instruments, which includes:

[0031] The system includes a main channel signal generator, an adjacent channel signal generator, a power meter, and a calibration instrument, wherein the radio frequency output terminals of the main channel signal generator and the adjacent channel signal generator are both connected to the input terminal of the combiner, and the output terminal of the combiner is connected to the power meter or the calibration instrument.

[0032] With the RF output of the adjacent channel signal generator off, adjust the output level of the main channel signal generator and measure the output power of the main channel signal generator using a power meter; with the RF output of the main channel signal generator off, adjust the output level of the adjacent channel signal generator and measure the output power of the adjacent channel signal generator using a power meter; calculate the adjacent channel power leakage ratio standard value based on the output power of the main channel signal generator and the output power of the adjacent channel signal generator.

[0033] With the RF outputs of both the main channel signal generator and the adjacent channel signal generator turned on, and the parameter settings of the main channel signal generator and the adjacent channel signal generator remaining unchanged under the standard value of the adjacent channel power leakage ratio, the measured value of the adjacent channel power leakage ratio is obtained by measuring the instrument under calibration.

[0034] The adjacent channel power leakage ratio calibration factor is calculated based on the standard value and the measured value of the adjacent channel power leakage ratio.

[0035] According to the adjacent channel power leakage ratio calibration system of the communication device test instrument provided in this application, the adjacent channel power leakage ratio measurement function is selected in the instrument being calibrated, and the center frequency, main channel bandwidth, adjacent channel bandwidth, channel spacing and sweep width are set.

[0036] According to the adjacent channel power leakage ratio calibration system for the communication device test instrument provided in this application, the relationship between the main channel bandwidth, adjacent channel bandwidth, and channel spacing and the bandwidth of the main channel center frequency point from the adjacent channel center frequency point is as follows:

[0037] B3 + B1 / 2 + B2 / 2 = B,

[0038] Wherein, 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 of the main channel and the center frequency of the adjacent channel.

[0039] The sweep width is 2 to 3 times the bandwidth between the center frequency of the main channel and the center frequency of the adjacent channel.

[0040] This application provides a method for calibrating the adjacent channel power leakage ratio of a communication device test instrument. By disabling the RF output of one signal generator and adjusting the other, the mutual interference when both operate simultaneously can be eliminated, allowing precise focus on a single channel. This accurately measures the output power of the main channel signal generator and the adjacent channel signal generator, thus obtaining a standard value for the adjacent channel power leakage ratio and tracing the adjacent channel power leakage ratio back to single-frequency continuous wave power. By turning on the RF outputs of both the main channel and adjacent channel signal generators, multiple signals simultaneously act on the environment of the instrument being calibrated, simulating the coexistence of multiple signals in a real communication scenario. By obtaining the main channel power and adjacent channel power at this time, the measured value of the adjacent channel power leakage ratio is calculated, accurately revealing the actual degree of mutual interference between signals generated by different signal sources. This facilitates users in calibrating instruments with adjacent channel power leakage ratio measurement functions, such as spectrum analyzers, vector signal analyzers, and mobile communication integrated test instruments, based on calibration factors obtained from the standard value and the measured value of the adjacent channel power leakage ratio. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a flowchart of the adjacent channel power leakage ratio calibration method provided in this application;

[0043] Figure 2 This is a flowchart of step S100 in the adjacent channel power leakage ratio calibration method provided in this application;

[0044] Figure 3 This is a flowchart of step S200 in the adjacent channel power leakage ratio calibration method provided in this application;

[0045] Figure 4 This is one of the structural block diagrams of the adjacent channel power leakage ratio calibration system provided in this application;

[0046] Figure 5 This is the second block diagram of the adjacent channel power leakage ratio calibration system provided in this application.

[0047] Figure label:

[0048] 1. Main channel signal generator; 2. Adjacent channel signal generator; 3. Combiner; 4. Power meter; 5. Instruments to be calibrated. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] The adjacent channel power leakage ratio calibration method and calibration system provided in this application can be used to calibrate key transmitting components in wireless communication equipment and to evaluate the performance of wireless communication systems and their components. Key transmitting components in wireless communication equipment include power amplifiers, RF front-end modules, and transmitters, while the test instruments for evaluating the performance of wireless communication systems and their components include spectrum analyzers, vector signal analyzers, and mobile communication integrated test instruments.

[0051] Specialized test instruments such as spectrum analyzers, vector signal analyzers, and mobile communication integrated testers also require rigorous ACLR calibration to ensure the high accuracy and traceability of their measurement results. Slight differences may exist between different brands or models of test instruments; standardized ACLR calibration methods can improve the measurement consistency between these devices.

[0052] The following is combined with Figure 1 This application describes a method for calibrating the adjacent channel power leakage ratio of a test instrument for communication devices.

[0053] like Figure 1 As shown, the adjacent channel power leakage ratio calibration method for communication device test instruments provided in this application can be used to calibrate the adjacent channel power leakage ratio of communication device test instruments, and includes:

[0054] S100. 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 obtained by measuring with a power meter.

[0055] In this embodiment, a power meter is an instrument used to measure the power of electrical signals. It can accurately detect the power of an input signal. Its working principle is generally based on converting the input radio frequency (RF) or other frequency band electrical signals. For example, by using a specific sensor (such as a thermistor, diode, etc.) to convert the signal power into a measurable physical quantity (such as heat change, current or voltage change, etc.), and then through internal calibration and calculation circuits, finally displaying the power value of the measured signal in an appropriate unit (such as watt, decibel milliwatt, etc.).

[0056] The main channel power refers to the power of a signal within its predetermined, normally functioning channel. For example, in wireless communication, if a communication system operates in a specific frequency band as the main channel, then the power of the useful signal carried in that frequency band is the main channel power, which can be measured in watts (W) or decibels per milliwatt (dBm).

[0057] Adjacent channel power refers to the power leaked into channels adjacent to the main channel. Because the actual signal transmission process is not ideal, some power will leak into adjacent channels, interfering with ongoing communication in those adjacent channels. Adjacent channel power can also be measured in watts (W) or decibels per milliwatt (dBm).

[0058] Based on the output power of the main channel signal generator and the adjacent channel signal generator measured by the power meter, the standard value of the adjacent channel power leakage ratio is calculated. This allows for accurate tracing of the adjacent channel power leakage ratio measurement results back to the power meter. Leveraging the power meter's high-precision measurement capabilities and calibration traceability system, the accuracy and reliability of the obtained output power values ​​of the main channel signal generator and the adjacent channel signal generator are ensured. This provides a reliable data foundation for calculating the standard value of the adjacent channel power leakage ratio, making the entire evaluation process rigorous in terms of measurement traceability. It allows for tracing back to the basic measurement values ​​provided by the power meter, the source instrument, providing strong support for subsequent communication system performance analysis, interference control, and standard compliance judgment.

[0059] S200. 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 measured value of the adjacent channel power leakage ratio is obtained; wherein, the measured value of the adjacent channel power leakage ratio is obtained by using the adjacent channel power leakage ratio function of the instrument being calibrated.

[0060] In the embodiments of this application, the main channel power refers to the signal power contained within a specific communication channel. For example, in wireless communication, different frequency bands are allocated as channels for transmitting information. The total effective signal power carried within this defined channel frequency band is the channel power. It reflects the power expected to be used to transmit useful information and can be measured in watts (W) or decibels per milliwatt (dBm).

[0061] Adjacent channel power refers to the power falling within adjacent channels (frequency bands adjacent to the primary channel of interest). In actual signal transmission, signals cannot be completely confined to the designated primary channel; some power will always leak into adjacent channels. This leaked power is called adjacent channel power, which can also be measured in watts (W) or decibels per milliwatt (dBm).

[0062] Obtaining the measured value of adjacent channel power leakage ratio has important and positive technical effects on assessing signal quality, optimizing communication system performance, and ensuring the compatibility and compliance of communication systems, which helps to promote the healthy and efficient development of the communications industry.

[0063] S300. Based on the standard value of adjacent channel power leakage ratio and the measured value of adjacent channel power leakage ratio, obtain the adjacent channel power leakage ratio calibration factor of the instrument being calibrated.

[0064] The adjacent channel power leakage ratio calibration method for the communication device test instrument provided in this application also includes:

[0065] S400. Measure the adjacent channel power leakage ratio of the instrument being calibrated according to the factory specifications. 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 different levels of adjacent channel power leakage ratio.

[0066] S500: Based on the adjacent channel power leakage ratio measurement factory specifications and modulation method of the instrument being calibrated, adjust the output of the main channel signal generator and change the continuous wave frequency of the main channel signal generator output. f 1. The bandwidth B between the center frequency of the main channel and the center frequency of the adjacent channel is calculated, and steps S100 to S400 are repeated.

[0067] In step S100 above, such as Figure 2 As shown, the process of obtaining the standard value of the adjacent channel power leakage ratio based on the main channel power and adjacent channel power output by the power meter is as follows:

[0068] S110. Connect the RF output terminals of the main channel signal generator and the adjacent channel signal generator to the input terminal of the combiner, and connect the output terminal of the combiner to the power meter.

[0069] S120. With the RF output of the adjacent channel signal generator turned off, set the continuous wave frequency of the main channel signal generator output 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 a power meter, and turn off the RF output of the main channel signal generator.

[0070] The link connecting the main channel signal generator and the power meter constitutes the main channel.

[0071] S130. With the RF output of the main channel signal generator turned off, set the continuous wave frequency of the adjacent channel signal generator output 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 use a power meter to measure the output power P2 of the adjacent channel signal generator.

[0072] Among them, the adjacent channel signal generator outputs a continuous wave frequency. f 2. The frequency of the continuous wave output by the main channel signal generator f The relationship of 1 is:

[0073] ,

[0074] in, B This represents the bandwidth between the center frequency of the main channel and the center frequency of the adjacent channel.

[0075] The link connecting the adjacent channel signal generator and the power meter constitutes the adjacent channel.

[0076] S140. Based on 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.

[0077] This embodiment of the application adjusts another signal generator by disabling the RF output of one signal generator, thus eliminating interference when both operate simultaneously. This allows for precise focusing on a single channel, accurately measuring the output power of the main channel signal generator and the adjacent channel signal generator, providing reliable data for subsequent calculations. The adjacent channel power leakage ratio is a key indicator for evaluating the channel condition of a communication system. By obtaining the corresponding power and calculating a standard value using the above method, the degree of signal leakage from the main channel to adjacent channels can be clearly determined.

[0078] In step S200 above, such as Figure 3 As shown, keeping the parameter settings of the main channel signal generator and the adjacent channel signal generator unchanged under the standard value of adjacent channel power leakage ratio, the process of measuring the actual value of adjacent channel power leakage ratio is as follows:

[0079] S210. Connect the output of the combiner to the RF input of the instrument being calibrated, and use the 10MHz reference signal output by the adjacent channel signal generator as the reference input signal between the main channel signal generator and the instrument being calibrated.

[0080] S220. In the instrument being calibrated, select the adjacent channel power leakage ratio measurement function and set the center frequency. f 1. Set appropriate sweep widths for the main channel bandwidth B1, adjacent channel bandwidth B2, and channel spacing B3, with the reference level set to automatic. 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.

[0081] Specifically, the relationship between the main channel bandwidth B1, the adjacent channel bandwidth B2, and the channel spacing B3 and the bandwidth B of the distance between the center frequency of the main channel and the center frequency of the adjacent channel is as follows:

[0082] B3 + B1 / 2 + B2 / 2 = B.

[0083] 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 from the instrument being calibrated. c Adjacent channel power P aj And the measured value of adjacent channel power leakage ratio is ACLR m .

[0084] Among them, the measured value of adjacent channel power leakage ratio is ACLR. m =P c -P aj .

[0085] 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 are simultaneously acting on the environment of the instrument being calibrated, simulating the situation of multiple signals coexisting in a real communication scenario. By obtaining the main channel power and adjacent channel power at this time, the measured value of the adjacent channel power leakage ratio can be calculated, which can accurately understand the actual degree of mutual interference between signals generated by different signal sources. For example, in complex wireless communication base station coverage areas, signals from multiple base stations or different frequency bands may be transmitted simultaneously, and similar adjacent channel interference problems may exist between them. With such measured values, it is clear to know the strength of interference of a specific signal on other signals on its adjacent channels under multi-signal concurrency, which helps to determine whether the accurate transmission of information carried by different signal sources will be affected by such leakage interference.

[0086] In multi-signal environments, accurate measured adjacent channel power leakage ratios (APRRs) are crucial for quickly locating interference sources and the specific frequency bands affected. If a measurement reveals a high APRR for a channel monitored by a calibrated instrument, comparing the relevant parameters of different signal generators with the corresponding channel and adjacent channel conditions allows identification of which signal generator is causing significant interference and pinpointing which adjacent frequency bands are affected. This is critical for subsequently implementing targeted measures, such as adjusting the transmission parameters of the interference source or changing signal frequency band allocations, to improve the overall communication environment.

[0087] The adjacent channel power leakage ratio calibration method provided in this application is illustrated below through a specific embodiment. The instrument being calibrated is a signal analyzer.

[0088] Connect the RF outputs of the main channel signal generator and the adjacent channel signal generator to the input of the combiner, and connect the output of the combiner to the power meter.

[0089] With the RF output of the adjacent channel signal generator turned off, the continuous wave frequency of the main channel signal generator output is set to...f 1 = 800MHz, turn on the RF output of the main channel signal generator, adjust the output level of the main channel signal generator, use a power meter to measure the output power of the main channel signal generator P1 = -10dBm, and turn off the RF output of the main channel signal generator.

[0090] With the RF output of the main channel signal generator turned off, the continuous wave frequency of the adjacent channel signal generator output is set to... f 2 = At 797.5MHz, turn on the RF output of the adjacent channel signal generator, adjust the output level of the adjacent channel signal generator, and use a power meter to measure the output power of the adjacent channel signal generator P2 = -20dBm.

[0091] Based on P1 and P2, the standard value of the adjacent channel power leakage ratio is ACLR. r = 10dBm.

[0092] Connect the output of the combiner to the RF input of the signal analyzer being calibrated, and use the 10MHz reference signal output from the adjacent channel signal generator as the reference input signal for both the main channel signal generator and the signal analyzer being calibrated.

[0093] In the signal analyzer being calibrated, select the adjacent channel power leakage ratio measurement function, set the center frequency to 800MHz, the main channel bandwidth to 100kHz, the adjacent channel bandwidth to 100kHz, the channel spacing to 2.4MHz, the sweep width to 10MHz, and the reference level to automatic.

[0094] 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 signal analyzer being calibrated. c Adjacent channel power P aj and the measured ACLR (Adjacent Channel Power Leakage Ratio) m .

[0095] Among them, the measured value of adjacent channel power leakage ratio is ACLR. m =P c -P aj .

[0096] Based on the factory specifications for the adjacent channel power leakage ratio of the instrument being calibrated, 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 different levels of adjacent channel power leakage ratio.

[0097] Based on the same inventive concept, such as Figure 4 As shown, this application also provides an adjacent channel power leakage ratio calibration system for communication device test instruments, comprising:

[0098] The system includes a main channel signal generator 1, an adjacent channel signal generator 2, a power meter 4, and a calibration instrument 5. The RF output terminals of the main channel signal generator 1 and the adjacent channel signal generator 2 are both connected to the input terminal of the combiner 3, and the output terminal of the combiner 3 is connected to either the power meter 4 or the calibration instrument 5.

[0099] With the RF output of adjacent channel signal generator 2 turned off, adjust the output level of main channel signal generator 1 and measure the output power of main channel signal generator 1 using power meter 4; with the RF output of main channel signal generator 1 turned off, adjust the output level of adjacent channel signal generator 2 and measure the output power of adjacent channel signal generator 2 using power meter 4; obtain the standard value of adjacent channel power leakage ratio based on the main channel power and adjacent channel power.

[0100] With the RF outputs of both the main channel signal generator 1 and the adjacent channel signal generator 2 turned on, and keeping the parameter settings of the main channel signal generator and the adjacent channel signal generator unchanged at the standard value of the adjacent channel power leakage ratio, the measured values ​​of the main channel power, adjacent channel power, and adjacent channel power leakage ratio are obtained in the calibration instrument 5.

[0101] Among them, such as Figure 5 As shown, more than one main channel signal generator 1 and one adjacent channel signal generator 2 can be configured. Specifically, each main channel signal generator 1 adopts... This indicates that each adjacent channel signal generator 2 adopts... To indicate, among which, n represents the number of signal generators. Signal generator Reference input terminal and signal generator Connect the reference output terminal to the signal generator. The reference output terminal and the signal generator Connect the reference input terminal. Signal generator. Reference output signal generator Connect the reference input terminal to the signal generator. Reference input terminal and signal generator Connect the reference output terminal to the signal generator. The reference output terminal and the signal generator Connect the reference input terminal to the signal generator. The reference output terminal is connected to the reference input terminal of the instrument being calibrated.

[0102] signal generator The RF output terminals of the signal generator are all connected to the input terminals of the first combiner. The RF output terminals of the first and second combiners are connected to the input terminals of the second combiner. The output terminals of the first and second combiners are connected to the input terminals of the third combiner. The input terminal of the third combiner is connected to the RF input terminal of the power meter or the instrument being calibrated.

[0103] The calibration process using this adjacent channel power leakage ratio calibration system is as follows:

[0104] S10. Assume the center frequency of the main channel is... The center frequency of the adjacent channel is The main channel bandwidth is B1, the adjacent channel bandwidth is B2, the channel spacing is B3, and the bandwidth between the center frequency of the main channel and the center frequency of the adjacent channel is... N frequency points are uniformly selected within the main channel. And these frequency points are related to the center frequency of the main channel. Symmetry. Similarly, n frequency points are uniformly selected within adjacent channels. And these frequencies are related to the center frequency of the adjacent channel. symmetry.

[0105] S20, Main Channel Signal Generator The output continuous wave frequency is set to Connect the power meter to the output of the combiner, turn on the RF output, and adjust the signal source output level so that the power meter displays a value. Turn off the radio frequency output.

[0106] Similarly, repeating this process n times, the main channel signal generator... The output continuous wave frequency is set to Connect the power meter to the output of the combiner, turn on the RF output, and adjust the signal source output level so that the power meter displays a value. Turn off the radio frequency output.

[0107] S30, Adjacent Channel Signal Generator The output continuous wave frequency is set to And meet the requirements:

[0108]

[0109] Turn on adjacent channel signal generator Radio frequency output; adjust the signal source output level to make the power meter display as [RF output]. Turn off the radio frequency output.

[0110] Similarly, repeating this process n times, the adjacent channel signal generator... The output continuous wave frequency is set to And meet the requirements:

[0111]

[0112] Turn on adjacent channel signal generator Radio frequency output; adjust the signal source output level to make the power meter display as [RF output]. Turn off the radio frequency output.

[0113] S40, Main channel power is Adjacent channel power is The standard value for adjacent channel power leakage ratio is .

[0114] S50, the combiner input is connected to each main channel signal generator and adjacent channel signal generator, and the combiner output is connected to the RF input of the signal analyzer under test. The signal analyzer under test is set to the adjacent channel power leakage ratio measurement function, and the center frequency is set to... Set the main channel bandwidth B1, adjacent channel bandwidth B2, channel spacing B3, and appropriate sweep width (2~3). B The reference level is set to automatic.

[0115] S60. Turn on the RF output of all main channel signal generators and adjacent channel signal generators, and read the main channel power record in the signal analyzer being calibrated. Read the adjacent channel power record as The measured value of the adjacent channel power leakage ratio is .

[0116] S70. Reduce the output level of the adjacent channel signal generator and repeat steps S30 to S60.

[0117] S80, Change the center frequency of the main channel and bandwidth B Repeat steps S10 to S70 above.

[0118] In other embodiments, the adjacent channel power leakage ratio calibration system for the communication device test instrument provided in this application further includes:

[0119] Based on the factory specifications for the adjacent channel power leakage ratio of instrument 5 under calibration, while keeping the output of the main channel signal generator 1 unchanged, the output level of the adjacent channel signal generator 2 is reduced, and the process of obtaining the standard value and the measured value of the adjacent channel power leakage ratio is repeated; and...

[0120] Based on the factory specifications for the adjacent channel power leakage ratio of the instrument 5 being calibrated and the modulation method, the output of the main channel signal generator 1 is adjusted, and the output continuous wave frequency and the bandwidth between the center frequency of the main channel and the center frequency of the adjacent channel are changed. The process of obtaining the standard value and the measured value of the adjacent channel power leakage ratio is repeated.

[0121] Before obtaining the main channel power and adjacent channel power in the instrument under test 5, the instrument under test 5 also includes selecting the adjacent channel power leakage ratio measurement function and setting the center frequency, main channel bandwidth, adjacent channel bandwidth, channel spacing and sweep width.

[0122] The relationship between the main channel bandwidth, adjacent channel bandwidth, and channel spacing and the bandwidth of the main channel center frequency point from the adjacent channel center frequency point is as follows:

[0123] B3 + B1 / 2 + B2 / 2 = B,

[0124] Wherein, 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 of the main channel and the center frequency of the adjacent channel.

[0125] The sweep width is 2 to 3 times the bandwidth B between the center frequency of the main channel and the center frequency of the adjacent channel.

[0126] Based on the standard value and measured value of adjacent channel power leakage ratio (ACLR) of the communication device test instrument obtained in this application, a calibration factor can be derived. The calibration factor is a key parameter used for calibrating and adjusting instruments or related communication equipment; it reflects the degree of difference between the actual measured value and the standard requirement value. The calibration factor allows for corresponding corrections to the equipment, making its performance more compliant with standard specifications, thereby improving measurement accuracy or signal transmission quality. In the case of adjacent channel power leakage ratio, the calibration factor is determined based on the ACLR standard value and the measured value, aiming to eliminate the deviation between the two and ensure that the equipment achieves ideal performance in terms of adjacent channel power leakage.

[0127] When calibrating the adjacent channel power leakage ratio of an instrument under test, users can obtain the standard value of the adjacent channel power leakage ratio based on the measured value and the aforementioned calibration factors. Then, based on the difference between the standard value and the measured value, further calibration measures can be taken to adjust the instrument under test. These measures include adjusting the power output of the instrument under test, optimizing internal filtering circuits, etc., to make the measured value closer to the standard value. This ensures that the performance of the instrument under test in terms of adjacent channel power leakage meets the corresponding requirements, guaranteeing accurate and stable operation in communication and other application scenarios, avoiding excessive interference to adjacent channels, and ensuring that the performance of the instrument under test meets the established standards and specifications.

[0128] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0129] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence 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 cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0130] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for calibrating the adjacent channel power leakage ratio of a test instrument for communication devices, characterized in that, include: The standard value of the adjacent channel power leakage ratio is calculated based on the output power of the main channel signal generator and the adjacent channel signal generator. This includes: connecting the RF outputs of both the main channel and adjacent channel signal generators to the input of a combiner, and connecting the output of the combiner to a power meter; with the RF output of the adjacent channel signal generator turned off, setting the continuous wave frequency of the main channel signal generator's output, turning on the RF output of the main channel signal generator, adjusting the output level of the main channel signal generator, measuring the output power of the main channel signal generator using the power meter, and then turning off the RF output of the main channel signal generator; with the RF output of the main channel signal generator turned off, setting the continuous wave frequency of the adjacent channel signal generator's output, turning on the RF output of the adjacent channel signal generator, adjusting the output level of the adjacent channel signal generator, and measuring the output power of the adjacent channel signal generator using the power meter; and finally, subtracting 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. Keeping the parameter settings of the main channel signal generator and the adjacent channel signal generator unchanged under the standard value of adjacent channel power leakage ratio, the measured value of adjacent channel power leakage ratio is obtained; wherein, the measured value of adjacent channel power leakage ratio is obtained by using the adjacent channel power leakage ratio function of the instrument being calibrated; The adjacent channel power leakage ratio calibration factor is obtained based on the standard value of adjacent channel power leakage ratio and the measured value of adjacent channel power leakage ratio.

2. The method according to claim 1, 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 as follows: In the formula, f 1 indicates the output continuous wave frequency of the main channel signal generator. f 2 indicates the output continuous wave frequency of the adjacent channel signal generator. B This represents the bandwidth between the center frequency of the main channel and the center frequency of the adjacent channel.

3. The method according to claim 1, characterized in that, The method involves keeping the parameter settings of the main channel signal generator and the adjacent channel signal generator unchanged while maintaining the standard value of the adjacent channel power leakage ratio, and measuring the actual value of the adjacent channel power leakage ratio, including: Connect the output of the combiner to the RF input of the instrument being calibrated, and use the reference signal output from the adjacent channel signal generator as the reference input signal between the main channel signal generator and the instrument being calibrated. In the instrument being calibrated, 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 measured value of the adjacent channel power leakage ratio in the instrument being calibrated.

4. The method according to claim 3, characterized in that, Also includes: Based on the factory specifications for the adjacent channel power leakage ratio of the instrument being calibrated, the output of the main channel signal generator is kept constant, while the output level of the adjacent channel signal generator is reduced. This process is repeated to obtain the standard value and the measured value of the adjacent channel power leakage ratio.

5. The method according to claim 4, characterized in that, Also includes: Based on the factory specifications for adjacent channel power leakage ratio of the instrument being calibrated and the modulation method, the output of the main channel signal generator is adjusted, and the output continuous wave frequency of the main channel signal generator and the bandwidth between the center frequency of the main channel and the center frequency of the adjacent channel are changed. The process of obtaining the standard value and the measured value of adjacent channel power leakage ratio is repeated.

6. The method according to claim 3, characterized in that, The relationship between the main channel bandwidth, adjacent channel bandwidth, and channel spacing and the bandwidth of the main channel center frequency point from the adjacent channel center frequencies is as follows: B3 + B1 / 2 + B2 / 2 = B Wherein, 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 of the main channel and the center frequency of the adjacent channel. The sweep width is 2 to 3 times the bandwidth between the center frequency of the main channel and the center frequency of the adjacent channel.

7. A calibration system for adjacent channel power leakage ratio of a communication device test instrument, characterized in that, include: The system comprises a main channel signal generator, an adjacent channel signal generator, a power meter, and a calibration instrument. The RF outputs of both the main channel signal generator and the adjacent channel signal generator are connected to the input of a combiner. The output of the combiner is connected to the power meter or the calibration instrument. With the RF output of the adjacent channel signal generator off, the output level of the main channel signal generator is adjusted, and its output power is measured using the power meter. With the RF output of the main channel signal generator off, the output level of the adjacent channel signal generator is adjusted, and its output power is measured using the power meter. The difference between the output power of the main channel signal generator and the output power of the adjacent channel signal generator is used to obtain the adjacent channel power leakage ratio standard value. With the RF outputs of both the main channel signal generator and the adjacent channel signal generator turned on, and the parameter settings of the main channel signal generator and the adjacent channel signal generator remaining unchanged under the standard value of the adjacent channel power leakage ratio, the measured value of the adjacent channel power leakage ratio is obtained by measuring the instrument under calibration. The adjacent channel power leakage ratio calibration factor is calculated based on the standard value of adjacent channel power leakage ratio and the measured value of adjacent channel power leakage ratio.

8. The system according to claim 7, characterized in that, Select the adjacent channel power leakage ratio measurement function in the instrument being calibrated, and set the center frequency, main channel bandwidth, adjacent channel bandwidth, channel spacing, and sweep width.

9. The system according to claim 8, characterized in that, The relationship between the main channel bandwidth, adjacent channel bandwidth, and channel spacing and the bandwidth of the main channel center frequency point from the adjacent channel center frequencies is as follows: B3 + B1 / 2 + B2 / 2 = B, Wherein, 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 of the main channel and the center frequency of the adjacent channel. The sweep width is 2 to 3 times the bandwidth between the center frequency of the main channel and the center frequency of the adjacent channel.

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