Method and apparatus for calibrating air interface wires of a multiple antenna device

Abstract

This invention provides a method and apparatus for calibrating the air interface cable of a multi-antenna device. Using instruments such as a channel simulator, bidirectional power amplifier, amplitude modulation and phase modulation network, anechoic chamber, probe, and turntable, combined with signal transmitting equipment such as a base station / comprehensive test instrument and the multi-antenna device under test, an air interface cable transmission channel for the signal is constructed at the antenna front end of the device under test. This supports a large number of protocol conformance, functional, and performance tests. This solution is not limited by frequency and bandwidth, nor by the model and specifications of the signal transmitting equipment and the multi-antenna device under test, and has advantages such as wide applicability and low cost.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to a method and apparatus for calibrating the air interface wires of a multi-antenna device. Background Technology

[0002] 5G introduces Massive MIMO technology, leading to a dramatic increase in the number of channels on base station panels. To perform RF and performance testing, traditional conducted testing methods require direct RF cable connections to each port, which is inefficient and unstable. The introduction of millimeter-wave technology in 5G allows antennas and RF units to be packaged together, making it impossible for terminals to establish conductive connections via drilled holes, rendering conducted testing impossible. Therefore, current testing systems have transitioned from conducted methods to over-the-air (OTA) testing.

[0003] There are several types of over-the-air (OTA) terminal performance testing methods, such as the Radiated Two-Stage (RTS) method and the Multiprobe Anechoic Chamber (MPAC) method.

[0004] MPAC systems are expensive to set up and have complex calibration procedures. Additionally, the anechoic chamber needs to be large enough to ensure the device under test is in the far-field region of the probe.

[0005] Currently, there is no truly commercially viable RTS testing system suitable for real base stations and terminals. The main reasons include: First, it is difficult to obtain phase information from each antenna at the terminal. Although the 3GPP protocol stipulates that terminal equipment should have interfaces for amplitude and phase measurement to facilitate the calibration of the air interface transmission matrix, opening phase measurement interfaces introduces additional computational complexity and power consumption. Second, there is no mechanism for verifying the accuracy of the test environment. The measurement accuracy and matrix characteristics of the air interface transmission matrix introduce additional interference, causing performance deviations from reality. Third, unlike the "Yuheng System," which has independent uplink and downlink probes, it requires bidirectional power amplifiers to compensate for OTA air interface path loss. Summary of the Invention

[0006] This application proposes a method and apparatus for calibrating the air interface wires of multi-antenna devices, which solves the problems of high algorithm complexity and low isolation in the air interface wire calibration of multi-antenna wireless communication devices.

[0007] First, this application proposes an air interface wire calibration method for a multi-antenna device. The output of the signal transmitting device is distributed to multiple dual-polarized probe channels via an amplitude and phase control module, and radiated to the multi-antenna device under test. The method includes the following steps:

[0008] Take any N probe channels as one combination, and construct an air interface transmission matrix with N antennas. Select several combinations with smaller condition numbers from multiple probe channel combinations.

[0009] Among the several combinations, the probe channel combination with the highest RSRP isolation between probes is selected as the preferred probe combination;

[0010] A preferred air interface transmission matrix is ​​constructed based on the amplitude and phase information of the preferred probe combination, and the inverse matrix of the preferred air interface transmission matrix is ​​imported into the amplitude and phase control module.

[0011] Preferably, the combination of conditions with a small number is as follows: N probe channels are randomly selected from the K probe channels to form a group and construct a temporary air interface transmission matrix H with the N antennas. tmp There are a total of Seek all H species. tmp The condition number is calculated and sorted in ascending order, and the top M are selected as candidate probe combinations for secondary screening.

[0012] Preferably, the preferred probe combination is as follows: N output signals of the base station are individually activated, and for the nth output signal, the difference Δ between the maximum and the second maximum of the received power values ​​RSRP of the N antennas of the device under test is calculated. n , n=1~N, set min{Δ1, Δ2,..., Δ N} is the probe combination Ω m Isolation degree Π m Iterate through M candidate probe combinations, with an isolation degree of max{Π1, ..., Π}. m ,...,∏ M The probe combination of} is the preferred probe combination under the current attitude of the device under test.

[0013] Preferably, in the air interface transmission matrix, the phase value is: only probes 1 and k are turned on, the output phase offset value θ1 of probe 1 is configured to be 0°, and the output phase offset value θ of probe k is adjusted simultaneously. k ∈[0°, 360°], determine the received power RSRP of antenna n of the device under test. n θ at maximum k The value of σ is used as the phase difference σ between probe k and antenna n. n，k Construct the phase values ​​of the air interface transmission matrix.

[0014] Preferably, the distance between any two dual-polarization probes is greater than a set spatial threshold.

[0015] Preferably, the method further includes the following steps: for each attitude, the above-mentioned screening of probe combinations is completed, and the pitch angle and horizontal angle of the device under test are traversed to obtain a globally preferred probe combination; a preferred air interface transmission matrix is ​​constructed based on the amplitude value information and phase value information of the globally preferred probe combination, and the inverse matrix of the preferred air interface transmission matrix is ​​imported into the amplitude and phase control module.

[0016] Preferably, in the air interface conductor calibration method of the multi-antenna device, a bidirectional power amplifier module is provided between the amplitude and phase control module and the dual-polarization probe. The bidirectional power amplifier module includes a time-controlled single-pole double-throw switch, controlled by reference signals and trigger signals accessed by the BBU and TDD time slot allocation information accessed by the PC.

[0017] Second, this application also proposes an air interface wire calibration device for a multi-antenna device, used to implement the method described in any one of the embodiments of this application, including an amplitude and phase control module, a bidirectional power amplifier module, and an air interface matrix selection module.

[0018] The amplitude and phase control module is used to control the amplitude and phase of the signal transmitted from the signal transmitting device to the dual-polarized probe. It introduces the inverse matrix of the preferred air interface transmission matrix to cancel the MIMO transmission link between the probe and the antenna of the device under test in the anechoic chamber.

[0019] The bidirectional power amplifier module is used to compensate for signal attenuation, eliminate loop self-excitation, and achieve uplink and downlink reciprocity.

[0020] The air interface matrix selection module further includes a turntable and multiple dual-polarized probes. The turntable is used to control the attitude of the device under test (DUT) to traverse the set azimuth and elevation angles. The dual-polarized probes are fixed to the inner wall of the anechoic chamber and aligned with the center of the DUT. The number of channels K of the dual-polarized probes is greater than the number of antennas N of the DUT.

[0021] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects:

[0022] The proposed test scheme for air interface wires of multi-antenna equipment combines multiple dual-polarized probes and a turntable in an anechoic chamber with a calibration algorithm. While ensuring algorithm complexity and calibration efficiency, it effectively improves antenna isolation and achieves the same signal transmission characteristics as conducted lines. This scheme is applicable to various types of signal transmitting equipment and multi-antenna test equipment, and the calibration algorithm is not limited by frequency, bandwidth, communication standard, number of antennas, or other conditions. Attached Figure Description

[0023] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0024] Figure 1 This is a block diagram of the two-step RF method for RTS.

[0025] Figure 2 This is a flowchart illustrating an embodiment of the air interface wire calibration method for the multi-antenna device of this application;

[0026] Figure 3 A test scheme for K×N MIMO over-the-air cables;

[0027] Figure 4 An air interface wire calibration system for a multi-antenna device;

[0028] Figure 5 This is a bidirectional power amplifier module based on a time-controlled switch;

[0029] Figure 6 An electronic device for a method of calibrating the air interface wires of a multi-antenna device. Detailed Implementation

[0030] 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 in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0032] Figure 1 This is a block diagram of the two-step RF method for RTS.

[0033] The RTS method is relatively low-cost and easy to implement, as follows: Figure 2 As shown. The first step of RTS is to measure the antenna pattern of the terminal under test (DUT), and the second step is to combine the terminal antenna pattern with the channel model under test (DUT) and input it into the channel simulator. In order to ensure that each probe antenna is connected only to the antenna port corresponding to the DUT in the case of wireless RF cable, and to realize the air interface wire connection, it is necessary to measure the amplitude and phase information on the antenna port of the terminal, complete the acquisition of the air interface transmission matrix between the output port of the channel simulator and the antenna port of the DUT, and input the inverse of the air interface transmission matrix into the channel simulator to realize the air interface wire connection in the second step.

[0034] In this application, "air interface cable" refers to the connection between the probe and the terminal antenna port, replacing wired signal transmission with one-to-one wireless signal transmission between the RF probe and the terminal antenna in the test system.

[0035] Figure 2 This is a flowchart illustrating an embodiment of the air interface wire calibration method for the multi-antenna device of this application.

[0036] First, this application proposes an air interface cable calibration method for multi-antenna devices. The output of the signal transmitting device is distributed to multiple dual-polarized probe channels via an amplitude and phase control module, radiating to the multi-antenna device under test. The high isolation calibration strategy for air interface cables proposed in this patent is carried out in three steps, using the condition number and RSRP isolation of the air interface transmission matrix as evaluation factors to complete the selection of the optimal transmission matrix.

[0037] The method includes the following steps:

[0038] Step 210: Using any N probe channels as one combination, construct an air interface transmission matrix with N antennas, and select several combinations with smaller condition numbers from the multiple probe channel combinations.

[0039] Preferably, the distance between any two dual-polarization probes is greater than a set spatial threshold.

[0040] Preferably, the combination of conditions with a small number is as follows: N probe channels are randomly selected from the K probe channels to form a group and construct a temporary air interface transmission matrix H with the N antennas. tmp There are a total of Seek all H species. tmp The condition number is calculated and sorted in ascending order, and the top M are selected as candidate probe combinations for secondary screening.

[0041] Preferably, in the air interface transmission matrix, the phase value is: only probes 1 and k are turned on, the output phase offset value θ1 of probe 1 is configured to be 0°, and the output phase offset value θ of probe k is adjusted simultaneously. k ∈[0°, 360°], determine the received power RSRP of antenna n of the device under test. n θ at maximum k The value of σ is used as the phase difference σ between probe k and antenna n. n，k Construct the phase values ​​of the air interface transmission matrix.

[0042] Step 220: Among the several combinations, select the probe channel combination with the highest RSRP isolation between probes as the preferred probe combination.

[0043] Preferably, the preferred probe combination is as follows: N output signals of the base station are individually activated, and for the nth output signal, the difference Δ between the maximum and the second maximum of the received power values ​​RSRP of the N antennas of the device under test is calculated. n , n=1~N, set min{Δ1, Δ2,..., Δ N} is the probe combination Ω m Isolation H m Iterate through M candidate probe combinations, with an isolation degree of max{∏1, ..., Π m ,...,∏ M The probe combination of} is the preferred probe combination under the current attitude of the device under test.

[0044] Step 203: Construct a preferred air interface transmission matrix based on the amplitude and phase information of the preferred probe combination, and import the inverse matrix of the preferred air interface transmission matrix into the amplitude and phase control module.

[0045] Preferably, the method further includes the following steps: for each attitude, the above-mentioned screening of probe combinations is completed, and the pitch angle and horizontal angle of the device under test are traversed to obtain a globally preferred probe combination; a preferred air interface transmission matrix is ​​constructed based on the amplitude value information and phase value information of the globally preferred probe combination, and the inverse matrix of the preferred air interface transmission matrix is ​​imported into the amplitude and phase control module.

[0046] Preferably, in the air interface conductor calibration method of the multi-antenna device, a bidirectional power amplifier module is provided between the amplitude and phase control module and the dual-polarization probe. The bidirectional power amplifier module includes a time-controlled single-pole double-throw switch, controlled by reference signals and trigger signals accessed by the BBU and TDD time slot allocation information accessed by the PC.

[0047] Figure 3 This is a K×N MIMO air interface cable testing scheme, and further details the high isolation calibration strategy for air interface cables in this application. The signal transmitting equipment is a base station (BS) or its simulator; the amplitude and phase control module can be, for example, a channel simulator (CE) and / or a MIMO channel system (MCS).

[0048] In step 210, the preliminary screening based on condition numbers using multiple probes is explained in detail below:

[0049] Taking the K×N MIMO air interface wire test scheme as an example, K represents the K channels of K / 2 dual-polarized probes, and N is the number of antennas of the device under test.

[0050] The overall air interface transmission matrix H can then be represented by the following formula.

[0051]

[0052] Where ω n，k The channel response between probe k and antenna n of the device under test is given by the amplitude value a. n，k and phase value φ n，kTwo decisions. For ease of calibration, only one signal, s1(f,t), can be turned on, and the calibration matrix G can be configured as an all-1 matrix. The measurement process includes the following steps 211–213:

[0053] Step 211: Measure the amplitude value a n，k

[0054] By controlling the A1 port of the MCS or CE to B1...B K The attenuation value on each transmission path of the port can achieve the effect of switching probe paths. K probe channels are opened respectively, and the RSRP values ​​of N antennas of the device under test are recorded. For example, turn on probe k and record the RSRP values ​​of the N antennas of the device under test as follows: The amplitude value of the full set air interface transmission matrix H can be represented by formula (2), where q is a constant.

[0055]

[0056] Step 212: Measure the phase difference σ n，k

[0057] Only turn on probes 1 and k, configure the output phase offset value θ1 of probe 1 to 0°, and simultaneously adjust the output phase offset value θ of probe k. k ∈[0°, 360°], determine the received power RSRP of antenna n of the device under test. n θ at maximum k The value of θ is such that the signal y(1) received by the antenna n of the device under test has the same phase value as y(k), and θ k equal to φ n，1 With φ n，k The phase difference, denoted here by σ n，k It means that φ n，k This value characterizes the phase change of the wireless signal transmitted from probe k to the device antenna n over the air interface. Repeating the above steps yields all phase difference information σ. 1，1 ...σ 1，k ...σ 1，K While adjusting the probe output phase offset value, the received power RSRP values ​​of antennas 2...N of the device under test can be observed, thereby obtaining all phase difference information. The phase value of the full set air interface transmission matrix H can be expressed by formula (3):

[0058]

[0059] Step 213: Perform preliminary screening based on condition numbers

[0060] With the amplitude value information H of the complete air interface transmission matrix H Amplitude and phase value information H PhaseThis means that with the amplitude and phase information of all air interface transmission links from the K probe channels to the N antennas, we can randomly select N probe channels from the K probe channels to form a group and construct a temporary air interface transmission matrix H with the N antennas. tmp There are a total of Types, such as the formula {k1, ..., k N The probe combination is in matrix form. Find all H... tmp The condition number is calculated and sorted in ascending order, and the top M are selected as candidate probe combinations for secondary screening.

[0061]

[0062] In step 220, a secondary screening based on isolation degree using multiple probes is implemented, as detailed below:

[0063] For the currently selected M alternative probe combinations Ω1...Ω m ...Ω M , and its matrix H tmp {Ω m The reverse import of} is sent to the MCS or CE, and other internal paths are disconnected. Ensure that the N base station output signals s1(f,t)......s N The power (f, t) is the same, and the device under test is ensured to be in network-connected status. S1(f, t)......S are turned on individually. N For example, if only s1(f,t) is enabled, calculate the difference Δ1 between the maximum and the second maximum RSRP of the N antennas of the device under test. Then, enable only s2(f,t) and so on to obtain Δ2...Δ N min{Δ1, Δ2, ..., Δ N That is, the probe combination Ω m Isolation degree Π m Let m = 1 to M. Iterate through the M candidate probe combinations and find the probe combination with the highest isolation: max{Π1, ..., Π...} m ,...,∏ M This refers to the optimal probe combination under the current posture of the device being tested.

[0064] In step 330, the attitude of the device under test is adjusted for further screening. Specifically, the turntable supports pitch angle adjustment from 0 to 360° and horizontal angle adjustment from 0 to 360°. (Based on angle...) The intervals are for pitch angles, and the intervals are for horizontal angles (μ). The equipment under test can be divided into intervals of [variables]. For each attitude, the above two steps of probe combination screening are performed, and the probe combination with the highest isolation is the globally optimal probe combination for all attitudes of the device under test. Based on the amplitude value information H under this probe combination...Amplitude and phase value information H phase Construct an air interface transmission matrix H, and set H -1 Importing the data into the amplitude and phase control module enables calibration of the over-the-air conductors. Furthermore, for simplification, if the maximum isolation of the device under test (DUT) exceeds a set threshold I at a certain attitude, then traversing the remaining DUT attitudes can be stopped, and the probe combination at that moment is used as the globally optimal probe combination.

[0065] Figure 4 This is an air interface wire calibration system for a multi-antenna device.

[0066] The purpose of this invention is to provide an over-the-air (ATA) cable testing solution for multi-antenna devices. This solution integrates three hardware units: an amplitude and phase control module, an ATA matrix selection module, and a bidirectional power amplifier module. Combined with a high-isolation calibration strategy for the ATA cable, it automates system calibration, enabling ATA cable connections between the signal transmitting device and the multi-antenna device under test (DUT), thus supporting system-level functional and performance testing. This solution, while ensuring the integrity of the DUT (without any hardware modifications such as drilling holes or wires) and the authenticity of the test environment (based on commercial signal transmitting equipment, such as a base station), achieves the same testing results as the MPAC method using only the Reference Signal Receiving Power (RSRP) detected by the DUT's antennas, significantly reducing system costs.

[0067] The test system of the present invention is shown, which specifically includes the following test unit modules: amplitude and phase control module, bidirectional power amplifier module and air interface matrix selection module.

[0068] (1) Amplitude and phase control module

[0069] Amplitude and phase control modules mainly refer to hardware instruments that can support MIMO transmission connections at input and output ports and can independently perform amplitude and phase control on each link, such as CE and MCS. Among them, the channel simulator not only has the capability of amplitude and phase control, but also supports simulating wireless channel characteristic parameters. Therefore, after the system calibration is completed, performance tests of the device under test under wireless channels can be performed directly.

[0070] The amplitude and phase control module has two main functions: first, it is responsible for the on / off state and phase control of the probe signal during the process of obtaining the air interface transmission matrix, and cooperates with the device under test to complete the acquisition of RSRP information under various states, thereby completing the calculation and solution of the air interface transmission matrix; second, it inserts the inverse of the air interface transmission matrix into the amplitude and phase control module to cancel the MIMO transmission link between the probe and the antenna of the device under test in the anechoic chamber, forming the SISO air interface wire transmission form.

[0071] (2) Two-way power amplifier module

[0072] bidirectional power amplifier module such as Figure 2 As shown, it mainly includes key components such as a time-controlled single-pole double-throw switch, a power amplifier, and an adjustable attenuator. Its main functions are threefold: first, to compensate for signal attenuation at the anechoic chamber opening, ensuring good power coverage for the device under test; second, to ensure uplink and downlink reciprocity by adjusting the adjustable attenuation, and to support performance tests such as those conducted at long distances; and third, to effectively prevent signal loop self-oscillation by utilizing the high isolation characteristics of the single-pole double-throw switch.

[0073] Figure 5 This is a bidirectional power amplifier module based on a time-controlled switch. The state of the time-controlled single-pole double-throw switch is simultaneously controlled by the reference and trigger signals connected to the BBU, and the TDD time slot allocation information connected to the PC. The reference signal ensures that the time accuracy is consistent with the BBU, the trigger signal ensures that the frame header start time of the TDD signal is consistent with the BBU, and the PC control signal ensures that the switch state is consistent with the uplink and downlink signal timings of the BBU. That is, during downlink (DL) signal transmission, both single-pole double-throw switches are connected. Figure 4 The DL path in the middle, and the uplink (UL) path in the opposite direction.

[0074] (3) Air interface matrix selection module

[0075] The antenna patterns of the device under test (DUT) antenna and the dual-polarized probe, as well as their relative positions over the air interface, determine the characteristics of the air interface transmission matrix. By adjusting the DUT's various orientations within the air interface using a turntable and simultaneously placing multiple dual-polarized probes, diverse air interface transmission matrices can be constructed. The optimal DUT orientation and probe combination can be selected based on the matrix condition number and the final isolation.

[0076] a. Turntable

[0077] Supports 2D rotation, pitch, and azimuth axes, and must support all attitudes of the device under test (DUT) within the anechoic chamber. The pitch axis supports pitch angle adjustment from 0 to 360°. The azimuth axis supports horizontal rotation from 0 to 360°. The turntable can be remotely controlled for start / stop and continuous rotation modes. Simultaneously, the turntable fixtures must stably fix the DUT and ensure that the center position of the DUT overlaps with the center of the anechoic chamber.

[0078] b. Dual-polarization probe

[0079] K / 2 dual-polarization probes are fixed to the inner wall of the darkroom, all aligned with the center of the device under test. The selection criteria for the number and position of the dual-polarization probes are as follows:

[0080] The number of channels K of the dual-polarized probe must be at least greater than the number of antennas N of the device under test, i.e., K≥N, to ensure that each antenna of the device under test has an independent transmission channel corresponding to it. The more dual-polarized probes there are, the more air interface transmission matrices can be selected, but this will also increase the complexity of system calibration.

[0081] The spatial spacing between dual-polarized probes should be maximized to reduce the correlation between different probes. This can be achieved by setting a spatial threshold.

[0082] In light of the aforementioned device technology, this application proposes a high isolation calibration strategy for air interface conductors. As described in the embodiments of the method in this application, the high isolation calibration strategy for air interface conductors proposed in the patent will be carried out in three steps, using the condition number and RSRP isolation of the air interface transmission matrix as evaluation factors to complete the screening of the preferred transmission matrix.

[0083] The process of implementing air interface cable testing based on a real base station and the device under test using this invention is as follows:

[0084] Step 310, according to Figure 2 Construct a hardware test system that includes signal transmitting equipment (e.g., base station / comprehensive tester), MCS / CE, bi-phase power amplifier, anechoic chamber, and the device under test (DUT). Synchronize the reference and trigger signals between the signal transmitting equipment and the bi-phase power amplifier. The computer controls the switching of the bi-phase power amplifier according to the TDD time slot allocation to ensure the DUT can normally connect to the network and perform services.

[0085] Step 320: Rotate the turntable to 0 degrees for both pitch and horizontal angles. Then, execute the first and second steps of the high isolation calibration strategy for the over-the-air cable to find the optimal probe combination for the current attitude of the device under test. Afterward, adjust the pitch and horizontal angles according to angular intervals. Rotating with μ, the optimal probe combination for the device under test can be found for each rotation angle. After traversing all angles, the globally optimal probe combination is selected based on the isolation. The optimal probe combination amplitude value information H is then used. Amplitude and phase value information H Phase Construct an air interface transmission matrix H, and set H -1 Import it into the amplitude and phase control module to achieve the calibration of the air-to-ground conductor.

[0086] Step 330: After completing the air interface cable calibration, protocol conformance or functional testing can be performed directly. Additionally, for performance testing, a CE device can be added between the base station and the MCS, or a channel model can be directly imported into the CE to investigate the performance of the device under test under a specific channel model.

[0087] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0088] Therefore, this application also proposes a computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the methods described in any embodiment of this application.

[0089] Furthermore, this application also proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method described in any embodiment of this application.

[0090] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0091] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0092] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0093] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, a network interface, and memory. Memory may include non-persistent storage in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0094] Figure 6 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device 600 shown is merely an example and should not impose any limitations on the function and scope of use of the embodiments of this application. It includes: one or more processors 620; and a storage device 610 for storing one or more programs. When the one or more programs are run by the one or more processors 620, the one or more processors 620 implement the air interface wire calibration method for multi-antenna devices provided in any embodiment of this application, and implement the processing of control quantities and calculation quantities in steps 210-230, 211-213, and 310-330.

[0095] The electronic device 600 also includes an input device 630 and an output device 640; the processor 620, storage device 610, input device 630 and output device 640 in the electronic device can be connected by a bus or other means, as shown in the figure, which is connected by a bus 650.

[0096] Storage device 610, as a computer-readable storage medium, may include a stored program area and a stored data area, wherein the stored program area may store an operating system and an application program required for at least one function; the stored data area may store data created based on the use of the terminal, etc. Storage device 610 may further include memory remotely disposed relative to processor 620, and such remote memory may be connected to a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0097] Input device 630 can be used to receive input digital, character, or voice information, and to generate key signal inputs related to user settings and function control of the electronic device. Output device 640 may include electronic devices such as a display screen and a speaker.

[0098] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0099] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for calibrating the air interface wire of a multi-antenna device, the output of a signal transmitting device is distributed to multiple dual-polarized probe channels through an amplitude and phase control module, and radiated to the measured multi-antenna device, characterized in that, The method comprises the following steps: Combining any N probe channels into one group, and constructing an air interface transmission matrix with N antennas, selecting several groups with small condition number of the air interface transmission matrix from multiple probe channel combinations; This includes: turning on only probe 1 and Configure the output phase offset value of probe 1 for At the same time, adjust the probe Output phase bias value Determine the antenna of the device under test. Received power Maximum The value of is used as the phase difference between probe k and antenna n. Construct the phase values ​​of the air interface transmission matrix; Among the several combinations, the probe channel combination with the highest RSRP isolation between probes is selected as the preferred probe combination; this includes: each base station is individually activated. The output signal of the first path, for the second path n Output signal to calculate the device under test Antenna received power value The difference between the maximum and the second maximum , n =1~N, set min{ , ,…, } is a probe combination isolation traversal A number of alternative probe combinations, with an isolation of max{ ,…, ,…, The probe combination described above is the preferred probe combination under the current attitude of the device under test. According to the amplitude value information and phase value information of the preferred probe combination, a preferred air interface transmission matrix is constructed, and the inverse matrix of the preferred air interface transmission matrix is introduced into an amplitude and phase control module.

2. The air interface wire calibration method for a multi-antenna device as described in claim 1, characterized in that, The method comprises the following steps: exist Choose any of the probe channels Each probe channel is grouped with A temporary air interface transmission matrix is ​​constructed using several antennas. There are a total of Seed, seeking all The condition number is calculated and sorted in ascending order, then the first condition number is selected. One probe combination was selected as a secondary screening candidate.

3. The method of claim 1, wherein the calibration of the air interface wires of the multiple antenna device is performed by using a calibration signal transmitted from the multiple antenna device. The method comprises the following steps: The distance between any two dual-polarized probes is greater than a set spatial threshold.

4. The air interface wire calibration method for a multi-antenna device as described in claim 1, characterized in that, The method comprises the following steps: Traversing the pitch angle and horizontal angle of the device under test to obtain a global preferred probe combination, or changing the pitch angle and horizontal angle of the device under test until a preferred probe combination with isolation greater than a set threshold is obtained as the global preferred probe combination; According to the amplitude value information and phase value information of the global preferred probe combination, a preferred air interface transmission matrix is constructed, and the inverse matrix of the preferred air interface transmission matrix is introduced into an amplitude and phase control module.

5. The method of claim 1, wherein the calibration of the air interface wires of the multiple antenna device is performed by using a calibration signal transmitted from the calibration device. The method comprises the following steps: A bidirectional power amplifier module is arranged between the amplitude and phase control module and the dual-polarized probe; The bidirectional power amplifier module contains a time-controlled single-pole double-throw switch, which is controlled by a reference signal and a trigger signal accessed by a BBU and TDD time slot matching information accessed by a PC.

6. An air interface wire calibration apparatus of a multiple antenna device for implementing the method of any one of claims 1 to 5, characterized by, The method comprises the following steps: An amplitude and phase control module is used to control the amplitude and phase of the signal transmission from a signal transmitting device to a dual-polarized probe, and the inverse matrix of the preferred air interface transmission matrix is introduced to offset the MIMO transmission link between the probe and the antenna of the device under test in the darkroom; A bidirectional power amplifier module is used to compensate signal attenuation, eliminate loop self-excitation, and realize uplink and downlink reciprocity; An air interface matrix selection module further comprises a turntable and multiple dual-polarized probes; The turntable is used to control the attitude of the device under test to traverse a set azimuth angle and pitch angle; The dual-polarized probes are fixed on the inner wall of the darkroom and are aligned with the center position of the device under test, and the number K of channels of the dual-polarized probes is greater than the number N of antennas of the device under test.

7. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to realize the method of any one of claims 1-5.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the computer program to realize the method of any one of claims 1-5.

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