Radio equipment spatial radiation test system, method and measuring instrument

Abstract

The present invention provides a system, method, and measuring instrument for spatial radiation testing of wireless devices, which first obtains the inverse of the spatial transfer matrix corresponding to multiple sub-frequency bands between the measuring instrument and the wireless device, then divides a desired test signal having a preset frequency band into desired test signals corresponding to multiple sub-frequency bands according to the frequency bands, and finally establishes a virtual cable connection between the measuring instrument and the wireless device, and loads the inverse of the spatial transfer matrix corresponding to each sub-frequency band into the desired test signal corresponding to the corresponding sub-frequency band, so as to perform a spatial radiation test on the wireless device.The present invention solves the problems of low isolation and low test accuracy when performing testing using the radiation two-stage (RTS) method, which are caused by relatively high variations in amplitude and phase in desired test signals having a relatively wide bandwidth preset frequency band.

Description

[Technical Field]

[0001] The present invention relates to the field of communications testing, and more particularly to a system, method and instrument for testing spatial radiation of wireless devices. [Background technology]

[0002] Modern wireless technologies often use MIMO (multi-input multi-output) technology to increase data transmission speeds. MIMO wireless devices have at least two receiver ports (connected to the receiving antenna) and / or two transmitter ports (connected to the transmitting antenna). MIMO OTA testing is a method for testing the overall performance of multi-antenna devices, which emulates a channel model to create a complex electromagnetic environment in an anechoic chamber and measure the receiving performance of wireless devices.

[0003] As shown in Figure 1, the base station has M transmitting antennas, and the terminal wireless device has N receiving antennas. The signal is transmitted from the transmitting port of the base station to the receiving port of the wireless device through multiple types of paths including direct path and reflected path. The basic parameters of the MIMO channel model include power distribution, angle of radiation (AoD), angle of arrival (AoA), time delay and Doppler effect, etc. These basic parameters are defined in detail in 3GPP, and the base station JPEG2026502910000002.jpg14170JPEG2026502910000003.jpg33150where l is one of the L subpaths, t is time, and f is the center frequency of the test. JPEG2026502910000004.jpg30170

[0004] In traditional MIMO testing, taking 2x2 MIMO testing as an example, as shown in Figure 2, in the normal case, the output port of the channel emulator is directly connected to the antenna port of the wireless terminal with a cable, the antenna pattern of the wireless terminal is incorporated into the channel emulator and calculated, and finally the test signal is supplied to the antenna port of the wireless terminal via a cable to measure the MIMO performance of the wireless terminal. However, this testing method causes the following two problems:

[0005] (1) The conduction method increases the isolation between the two antenna links of a wireless terminal, but when the wireless terminal actually operates, the isolation between the two antennas is finite. (2) The impact of noise from the wireless terminal itself on MIMO performance (i.e., desense in related technologies) cannot be reflected in the test results.

[0006] To summarize, compared with OTA measurement of the entire device, conducted measurement involves a different wireless terminal state, making it impossible to use conducted methods instead of OTA measurement. Furthermore, with the widespread application of millimeter waves, many millimeter wave antennas are directly installed on millimeter wave modules (AiP), and the entire module does not have a conductive interface, making it impossible to achieve millimeter wave MIMO measurement using conducted methods.

[0007] MIMO OTA test methods in the 3GPP and CTIA standards include the Radiated Two-Stage (RTS) method and the Multi-Probe Anechoic Chamber (MPAC) method. The MPAC method directly emulates the channel model through the spatial distribution of test probes. The RTS method uses the "OTA interface direct connection" method to achieve a one-to-one correspondence between the link connection between the transmitter and receiver, similar to connecting with a cable (also known as a "virtual cable"). This method meets the requirements of testing the entire device, maintains the coupling between antennas and noise interference between the hardware and antennas, and more realistically reflects the MIMO performance of wireless terminals. Summary of the Invention

[0008] The technical problem that the present invention primarily solves is how to perform airborne radiation testing on wireless devices.

[0009] According to a first aspect, one embodiment is a spatial radiation test system including a measuring instrument and at least two test antennas, the test antenna is for establishing a wireless communication link between the measuring device and the wireless device so that the measuring device and the wireless device communicate wirelessly; The measuring instrument obtaining an inverse matrix of a corresponding spatial transfer matrix in a plurality of sub-frequency bands between the measuring device and the wireless device; obtaining a desired test signal having a predetermined frequency band; dividing the desired test signal having the predetermined frequency band into desired test signals having a plurality of corresponding sub-frequency bands according to the frequency band, wherein a frequency range consisting of the plurality of sub-frequency bands is a frequency range corresponding to the predetermined frequency band; A spatial radiation test system for a wireless device is provided, which is set up to establish a virtual cable connection between the measuring instrument and the wireless device, load the inverse matrix of the spatial transmission matrix corresponding to each of the sub-frequency bands onto a desired test signal corresponding to the corresponding sub-frequency band, and obtain a transmission test signal corresponding to each sub-frequency band, so as to perform a spatial radiation test on the wireless device.

[0010] According to a second aspect, one embodiment comprises: Obtaining an inverse matrix of a spatial transfer matrix corresponding to a plurality of sub-frequency bands between the measuring instrument and the wireless device; Obtain a desired test signal having a predetermined frequency band, and divide the desired test signal having the predetermined frequency band into desired test signals having a plurality of corresponding sub-frequency bands according to the frequency band, wherein a frequency range consisting of the plurality of sub-frequency bands is a frequency range corresponding to the predetermined frequency band; and establishing a virtual cable connection between the measuring instrument and the wireless device, and loading an inverse matrix of a spatial transfer matrix corresponding to each of the sub-frequency bands onto a desired test signal corresponding to the corresponding sub-frequency band, thereby obtaining a transmission test signal corresponding to each sub-frequency band, so as to perform a spatial radiation test on the wireless device.

[0011] According to a third aspect, one embodiment comprises: an inverse matrix acquisition module for acquiring an inverse matrix of a corresponding spatial transfer matrix in a plurality of sub-frequency bands between the measuring instrument and a wireless device; a sub-frequency band acquisition module for obtaining a desired test signal having a predetermined frequency band, and dividing the desired test signal having the predetermined frequency band into desired test signals having a plurality of corresponding sub-frequency bands according to the frequency band, wherein the frequency range of the plurality of sub-frequency bands is the frequency range corresponding to the predetermined frequency band; The measuring instrument includes an inverse matrix loading module that loads the inverse matrix of the spatial transmission matrix corresponding to each sub-frequency band onto a desired test signal corresponding to the corresponding sub-frequency band to obtain a transmission test signal corresponding to each sub-frequency band, so as to establish a virtual cable connection between the measuring instrument and the wireless device and perform a spatial radiation test on the wireless device.

[0012] According to a fourth aspect, one embodiment provides a computer-readable storage medium having a program stored therein, the program being executed by a processor to implement the spatial radiation testing method described in any one of the embodiments.

[0013] According to the above-mentioned embodiment of the system, method, and measuring instrument for spatial radiation testing of wireless devices, the inverse matrices of the spatial transmission matrices corresponding to the multiple sub-frequency bands between the measuring instrument and the wireless device are obtained, the desired test signal having a predetermined frequency band is divided into the desired test signals corresponding to the multiple sub-frequency bands according to the frequency bands, and finally, the inverse matrices of the spatial transmission matrices corresponding to each sub-frequency band are loaded into the desired test signals corresponding to the corresponding sub-frequency bands, so as to realize the spatial radiation testing of the wireless device by establishing a virtual cable connection between the measuring instrument and the wireless device. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic diagram of a MIMO channel model in the prior art. [Figure 2] 1 is a schematic diagram of the structure of a conventional 2×2 multiple-input multiple-output (MIMO) test system. [Figure 3] FIG. 1 is a schematic diagram of crosstalk signals in a 2×2 multiple-input multiple-output (MIMO) test system. [Figure 4] FIG. 1 is a schematic diagram of the total transmit matrix in a 2×2 multiple-input multiple-output (MIMO) test system. [Figure 5] 1 is a schematic diagram of the structure of a wireless device spatial radiation test system according to one embodiment; [Figure 6] FIG. 1 is a schematic diagram of dividing a desired test signal having a preset frequency band into multiple sub-frequency bands; [Figure 7] FIG. 1 is a flow diagram of a method for testing spatial radiation of a wireless device according to one embodiment. [Figure 8] FIG. 1 is a schematic diagram of the structure of a measuring device according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] The present invention will be described in more detail below through specific embodiments with reference to the accompanying drawings. In the following embodiments, similar parts are designated by the same reference numerals. In the following embodiments, numerous detailed descriptions are provided for a better understanding of the present application. However, those skilled in the art will readily recognize that certain features herein may be omitted or substituted with other components, materials, or methods in different cases. In some cases, some operations related to the present application are not shown or described in the specification to avoid obscuring the core of the present application in excessive description. Those skilled in the art will not need to describe these related operations in detail; they can fully understand the related operations based on the descriptions in the specification and common technical knowledge in the field.

[0016] Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method descriptions may be interchanged or adjusted in order based on manners apparent to those skilled in the art. Thus, the various orders in the specification and accompanying drawings are for the purpose of clearly describing one embodiment, and no required order is implied unless specifically stated to follow a certain order therein.

[0017] The serial numbers assigned to components in this document, such as "first" and "second," are merely used to distinguish between the objects being described and do not have any ordering or technical significance. Unless otherwise specified, "connection" and "coupled" in this application include both direct and indirect connection (coupling).

[0018] Below, we will introduce the Radiated Two-Stage (RTS) method in the MIMO OTA test method.

[0019] In MIMO OTA testing, the expressions for the transmitted and received test signals are as follows: JPEG2026502910000005.jpg550JPEG2026502910000006.jpg30170JPEG2026502910000007.jpg1977. Among them, JPEG2026502910000008.jpg621 represents the transmission parameters corresponding to the communication link between the first transmitting port of the measuring instrument (connected to the first test antenna, and so on) and the first receiving port of the wireless device; JPEG2026502910000009.jpg621 represents transmission parameters corresponding to a communication link between the Nth transmitting port of the measuring device (connected to the Nth test antenna, and so on) and the first receiving port of the wireless device; JPEG2026502910000010.jpg622 represents transmission parameters corresponding to a communication link between a first transmitting port of the measuring device and an Nth receiving port of the wireless device; JPEG2026502910000011.jpg619 represents the transmission parameters corresponding to the communication link between the Nth transmitting port of the measuring device and the Nth receiving port of the wireless device.

[0020] There is cross-transmission between the test antenna and the receiver port of the radio equipment. JPEG2026502910000012.jpg21170JPEG2026502910000013.jpg1976.

[0021] Among them, JPEG2026502910000014.jpg618 represents the reverse transmission parameters corresponding to the communication link between the first transmitting port of the measuring instrument and the first receiving port of the wireless device; JPEG2026502910000015.jpg615 represents the reverse transmission parameters corresponding to the communication link between the Nth transmitting port of the measuring device and the first receiving port of the wireless device; JPEG2026502910000016.jpg618 represents the reverse transmission parameters corresponding to the communication link between the first transmitting port of the measuring instrument and the Nth receiving port of the wireless device; JPEG2026502910000017.jpg617 represents the reverse transmission parameters corresponding to the communication link between the Nth transmitting port of the measuring device and the Nth receiving port of the wireless device.

[0022] Taking a 2x2 MIMO receiver performance test as an example, as shown in Figure 3, the base station emulator and channel emulator in the measuring instrument process the transmit signal by incorporating an antenna pattern, and during the test, the required transmit signal is the signal transmitted from transmit port 1 of the measuring instrument to receiver port 1 of the wireless device, and the signal transmitted from transmit port 2 of the measuring instrument to receiver port 2 of the wireless device, so the crosstalk signal transmitted from transmit port 1 to receiver port 2 of the wireless device and the crosstalk signal transmitted from transmit port 2 to receiver port 1 of the wireless device are interference signals in the MIMO test. The spatial transmission matrix H in the 2x2 test system can be written as follows: Due to the existence of cross-links, the test signal integrated with the channel model cannot be accurately transmitted to each receiver port of the wireless device. Therefore, by using an inverse matrix, the effects of cross-transmission can be eliminated and a "direct air interface connection" between the measuring instrument and the wireless device, i.e., a virtual cable connection, can be realized. The inverse matrix can be realized by amplifiers, attenuators, and phase shifters (or digital signal processing) in the channel emulator.

[0023] After loading the inverse of the spatial transmission matrix, the relationship between the transmitted and received signals is The result is JPEG2026502910000019.jpg663.

[0024] As shown in Figure 4, the total transmission matrix T of a 2x2 MIMO system is Defined as JPEG2026502910000020.jpg1261.

[0025] Among them, JPEG2026502910000021.jpg12137JPEG2026502910000022.jpg7170In this case, the test signal transmitted from transmit port 1 of the measuring instrument is only transmitted to receiver port 1 of the wireless device, and the test signal transmitted from transmit port 2 of the measuring instrument is only transmitted to receiver port 2 of the wireless device, and the crossover signal is eliminated by introducing an inverse matrix.In an actual link, the crossover signal cannot be completely eliminated due to factors such as signal reflection in the test system and limited power and phase adjustment accuracy.Therefore, to evaluate the impact of the crossover channel on test accuracy, the related art has introduced the concept of isolation, which refers to the amplitude relationship between the crossover signal and the desired signal.Isolation is defined as follows: JPEG2026502910000023.jpg838JPEG2026502910000024.jpg838JPEG2026502910000025.jpg647JPEG2026502910000026.jpg15169. It is recognized that a good "air interface direct connection" can be achieved when the isolation is a certain preset value. In MIMO OTA testing, isolation is one of the key factors that affect test errors. Isolation is related to the relative positions of the wireless device and the test antenna, and the antenna patterns of the wireless device and the test antenna.

[0026] Therefore, the RTS method first obtains the antenna radiation direction diagram and spatial transmission matrix of the wireless device, then obtains the inverse matrix of the spatial transmission matrix, and then calculates the inverse matrix by introducing it into the test signal to cancel the spatial transmission matrix, thereby realizing a "direct air interface connection" between the base station emulator (BSE) and the wireless device under test (DUT), thereby performing MIMO OTA testing.

[0027] As communication bandwidths expand and communication link designs become increasingly complex, amplitude and phase variations in the link reduce the isolation within the bandwidth of the receiver port of wireless devices, posing a serious challenge to MIMO measurements. RF components in the link, such as RF cables, amplifiers, attenuators, and filters, all modulate the amplitude and phase within the bandwidth in different ways. When the test signal is a narrowband signal, the signal distortion caused by such modulation is not significant. However, as the bandwidth expands, the amplitude and phase of different signals within the bandwidth arriving at the center of the test vary significantly at different frequencies. These amplitude and phase variations within the bandwidth can cause significant test errors when MIMO testing, regardless of whether the conventional radiated two-stage (RTS) method or the multi-probe anechoic chamber (MPAC) method is used.

[0028] In 4G MIMO testing, the test signal is a narrowband signal (frequency width ≦ 20 MHz), and the amplitude and phase fluctuations within the frequency band of the narrowband signal are relatively small, so it matches the center frequency relatively well. The inverse matrix of the spatial transfer matrix obtained based on the center frequency of the frequency band according to the above-mentioned RTS method can achieve good isolation (e.g., 20 dB or more) across the entire frequency band, so the problem of amplitude and phase fluctuations can be ignored. In 5G broadband MIMO testing, as the system bandwidth expands, the amplitude and phase fluctuate significantly across a wide frequency band. Therefore, if the inverse matrix of the spatial transfer matrix calculated based on the center frequency of the frequency band according to the above-mentioned RTS method is used across the entire wide frequency band, antenna isolation will deteriorate, making it difficult to achieve "air interface direct connection," resulting in increased uncertainty in MIMO testing and making it impossible to evaluate the true performance of the wireless device being measured.

[0029] In an embodiment of the present invention, a wide frequency band test signal is divided into multiple narrow frequency band test signals, an inverse matrix of the spatial transfer matrix is ​​calculated for each narrow frequency band, and the inverse matrix of the spatial transfer matrix is ​​loaded into the narrow frequency band test signals, thereby realizing the spatial radiation test of a wireless device.

[0030] 5, an embodiment of the present invention provides a system for testing spatial radiation of a wireless device, in which a wireless device 200 is a wireless device to be measured, and the wireless device 200 has at least two receiver ports 202 (transmitter ports 203), with each receiver port 202 (transmitter port 203) connected to one receiving / transmitting antenna 201. The spatial radiation testing system provided in this embodiment includes a test antenna 101 and a measuring device 102, and the measuring device 102 has at least two transmitting ports 103 (receiving ports 104), with each transmitting port 103 (receiving port 104) connected to one test antenna 101. The test antenna 101 establishes a wireless communication link between the measuring device 102 and the wireless device 200, thereby realizing wireless communication between the measuring device 102 and the wireless device 200. The measuring device 102 is connected to the test antenna 101 and the wireless device 200 via a cable connection or a wireless connection. An anechoic chamber 300 is used to provide an electromagnetic environment for testing. It should be noted that in FIG. 5, the measuring device 102 is installed inside the anechoic chamber 300, and in other embodiments, the measuring device 102 may be installed outside the anechoic chamber 300.

[0031] The measuring instrument 102 is configured to perform the airborne radiation test of the wireless device 200 by the following operations.

[0032] (1) Obtain the inverse of the spatial transfer matrix corresponding to the multiple sub-frequency bands between the measuring device 102 and the wireless device 200.

[0033] In one embodiment, obtaining the inverse of the spatial transfer matrix corresponding to the multiple sub-frequency bands between the measuring device 102 and the wireless device 200 includes obtaining a downlink inverse matrix and / or an uplink inverse matrix, where the downlink inverse matrix is ​​the inverse of the spatial transfer matrix corresponding to the multiple sub-frequency bands between the measuring device 102 and the receiver of the wireless device 200, and the uplink inverse matrix is ​​the inverse of the spatial transfer matrix corresponding to the multiple sub-frequency bands between the transmitter of the wireless device 200 and the measuring device, which will be described in detail below.

[0034] (1) When the wireless device 200 performs a reception performance test, it obtains a downlink inverse matrix using the following method.

[0035] Each transmitting port 103 of the measuring device 102 transmits a signal in each sub-frequency band, and each receiver port 201 of the wireless device 200 obtains the change in amplitude of the signal in each sub-frequency band transmitted from each transmitting port 103 of the measuring device 102 and received by the corresponding receiver port 201. In this embodiment, the transmitting port 103 that is currently transmitting a signal is referred to as the current transmitting port 103. At this time, the other transmitting ports 103 are in an off state. When the current transmitting port 103 transmits a signal, the current transmitting port 103 may be controlled to transmit the signals of each sub-frequency band one by one. When the current transmitting port 103 transmits a signal of the current sub-frequency band, one or more receiver ports 201 of the wireless device 200 may be controlled to receive the signal of the current sub-frequency band. Alternatively, all receiver ports 201 of all wireless devices 200 may be controlled to simultaneously receive the signal of the current sub-frequency band. After all receiver ports 201 of the wireless device 200 receive the change in the amplitude of the signal of the current sub-frequency band, the current transmitting port 103 is further controlled to transmit the signal of the next sub-frequency band. Finally, the change in the amplitude of the signals of each sub-frequency band transmitted from the current test antenna 101 received by all receiver ports 201 of the wireless device 200 is obtained. By repeating this process, the other transmitting ports 103 are set as the current transmitting port 103 one by one, and the change in amplitude of the signal in each sub-frequency band transmitted from each transmitting port 103 received by each receiver port 201 of the wireless device 200 can be obtained.

[0036] Any two transmitting ports 103 of the measuring instrument 102 transmit signals in each sub-frequency band multiple times with different phase differences, and the phase differences of the signals in each sub-frequency band transmitted from any two transmitting ports 103 and received by each receiver port 201 of the wireless device 200 are obtained. In this embodiment, the transmitting ports 103 currently transmitting signals are designated as the first current transmitting port 103 and the second current transmitting port 103. When the other transmitting ports 103 are in an off state and the first current transmitting port 103 and the second current transmitting port 103 transmit signals of the current sub-frequency band with different phase differences, one or more receiver ports 201 of the wireless device 200 may be controlled to receive the signals of the current sub-frequency band, or all receiver ports 201 of the wireless device 200 may be controlled to simultaneously receive the signals of the current sub-frequency band. After obtaining the phase difference of the signals of the current sub-frequency band received by the receiver ports 201 of the wireless device 200, the first current transmitting port 103 and the second current transmitting port 103 are further controlled to transmit signals of the next sub-frequency band with different phase differences multiple times, so as to finally obtain the phase differences of the signals of each sub-frequency band transmitted from the first current transmitting port 103 and the second current transmitting port 103 received by all receiver ports 201 of the wireless device 200. By analogy, any other two transmitting ports 103 can be respectively treated as the first current transmitting port 103 and the second current transmitting port 103, and the phase difference of each sub-frequency band signal transmitted from any two transmitting ports 103 received by each receiver port 201 of the wireless device 200 can be obtained.

[0037] In one embodiment, the calculation of the phase difference of the signal of the current sub-frequency band received by the receiver port 201 of the wireless device 200 is performed by calculating the phase difference by Fourier series fitting or Fourier transform based on the amplitude of the signal of the current sub-frequency band transmitted from the first current transmitting port 103 and the second current transmitting port 103, respectively, received by each receiver port 202 of the wireless device 200, and the amplitude of the combined signal (i.e., the signal transmitted together by the first current transmitting port 103 and the second current transmitting port 103). In another embodiment, the phase difference calculation method may be as follows: first, calculate a composite amplitude reference value based on the amplitude of the current sub-frequency band signals respectively transmitted from the first current transmitting port 103 and the second current transmitting port 103 received by each receiver port 202 of the wireless device 200, where the composite amplitude reference value is a calculated value of the amplitude of the composite signal obtained when the respectively transmitted current sub-frequency band signals are combined by each receiver port 202 of the wireless device 200 with different phase differences; and then calculate the phase difference based on the calculated composite amplitude reference value and the amplitude of the composite signal obtained by the test.

[0038] According to the amplitude change and phase difference of the signal of each sub-frequency band transmitted by the measuring device 102 and received by the wireless device 200, the corresponding spatial transfer matrix is ​​determined for multiple sub-frequency bands from the transmitting port 103 of the measuring device 102 to the receiving port 202 of the wireless device 200, thereby obtaining the inverse matrix of the spatial transfer matrix.

[0039] In one embodiment, taking n transmit ports 103 and n receiver ports 202 as an example, the corresponding spatial transfer matrix in the i-th sub-frequency band can be obtained according to the following expression: JPEG2026502910000027.jpg28131JPEG2026502910000028.jpg38170

[0040] From the spatial transfer matrix corresponding to the i-th sub-frequency band, the i-th JPEG2026502910000029.jpg7150JPEG2026502910000030.jpg1981JPEG2026502910000031.jpg14169Represents the reverse transmission parameters of the signal transmitted from the kth transmitting port 103 and received by the vth transmitting port 202.

[0041] In this embodiment, the frequency bands that are preset based on the following expressions correspond to: JPEG2026502910000032.jpg6128JPEG2026502910000033.jpg1948JPEG2026502910000034.jpg23170 are the inverse transmission parameters corresponding to each sub-frequency band.

[0042] (2) When the wireless device 200 performs a transmission performance test, it obtains an uplink inverse matrix by the following method.

[0043] A signal in each sub-frequency band is transmitted from each transmitter port 204 of the wireless device 200, and the change in amplitude of the signal in each sub-frequency band transmitted from each transmitter port 204 of the wireless device 200 and received by each receiver port 104 of the measuring instrument 102 is obtained. In this embodiment, the transmitter port 204 that is currently transmitting a signal is referred to as the current transmitter port 204. In this case, when the other transmitter ports 204 are in an off state and the current transmitter port 204 transmits a signal, the current transmitter port 204 may be controlled to transmit the signals of each sub-frequency band one by one; when the current transmitter port 204 transmits a signal of the current sub-frequency band, one or more receiver ports 104 of the measuring device 102 may be controlled to receive the signal of the current sub-frequency band; or all receiver ports 104 of all measuring devices 102 may be controlled to simultaneously receive the signal of the current sub-frequency band; after all receiver ports 104 of the measuring device 102 receive the change in the amplitude of the signal of the current sub-frequency band, the current transmitter port 204 is further controlled to transmit the signal of the next sub-frequency band, and finally, the change in the amplitude of the signal of each sub-frequency band transmitted from the current transmitter port 204 received by all receiver ports 104 of the measuring device 102 is obtained. By analogy, the other transmitter ports 204 can be set as the current transmitter port 204 one by one, and the change in amplitude of the signal in each sub-frequency band transmitted from each transmitter port 204 received by each receiver port 104 of the measuring instrument 102 can be obtained.

[0044] Any two transmitter ports 204 of the wireless device 200 transmit signals in each sub-frequency band multiple times with different phase differences, and obtain the phase difference of the signals in each sub-frequency band respectively transmitted from any two transmitter ports 204 received by each receiver port 104 of the measuring device 102. In this embodiment, the transmitter ports 204 of the currently transmitted signals are designated as the first current transmitter port 204 and the second current transmitter port 204. When the other transmitter ports 204 are in an off state and the first current transmitter port 204 and the second current transmitter port 204 transmit signals in the current sub-frequency band with different phase differences, one or more receiver ports 104 of the measuring device 102 may be controlled to receive the signals in the current sub-frequency band, and all receiver ports 104 of the measuring device 102 may receive the signals in the current sub-frequency band. Alternatively, the receiver port 104 of the measuring device 102 may be controlled to simultaneously receive signals in the current sub-frequency band, and after obtaining the phase difference between the signals in the current sub-frequency band received by the receiver port 104, the first current transmitter port 204 and the second current transmitter port 204 may be further controlled to transmit signals in the next sub-frequency band multiple times with different phase differences, thereby finally obtaining the phase difference between the signals in each sub-frequency band transmitted from the first current transmitter port 204 and the second current transmitter port 204 received by all receiver ports 104 of the measuring device 102. By analogy, any other two transmitter ports 204 can be respectively designated as the first current transmitter port 204 and the second current transmitter port 204, and the phase difference between the signals in each sub-frequency band transmitted from any two transmitter ports 204 received by each receiver port 104 of the measuring device 102 can be obtained.

[0045] According to the amplitude change and phase difference of the signal of each sub-frequency band transmitted by the wireless device 200 received by the measuring device 102, the corresponding spatial transfer matrix of the multiple sub-frequency bands between the transmitter port 204 of the wireless device and the measuring device is determined, and the inverse matrix of the spatial transfer matrix is ​​obtained.

[0046] It is necessary to note that the operating state of the measuring instrument and the wireless device may be either a transmitting state or a receiving state, and the specific method of obtaining the downlink inverse matrix by the receiver performance test has been described in detail in the above embodiment. According to the principle of transmit and receive reciprocity, the test results obtained by the transmitter performance test and the receiver performance test should be consistent, so this embodiment does not go into detail about the specific method of obtaining the uplink inverse matrix by the transmitter performance test.

[0047] (2) The measuring device 102 obtains a desired test signal having a predetermined frequency band, and divides the desired test signal having the predetermined frequency band into desired test signals having corresponding sub-frequency bands according to the frequency band, where the frequency range consisting of the plurality of sub-frequency bands is the frequency range corresponding to the predetermined frequency band. In this embodiment, the predetermined frequency band is a frequency band having a relatively wide frequency range, for example, the commonly used frequency band for 5G communication is 100 MHz or 400 MHz. It should be noted that when dividing a preset frequency band into multiple sub-frequency bands, generally, the more sub-frequency bands there are, the smaller the difference in signal amplitude within each sub-frequency band will be, and ultimately the higher the test accuracy will be. However, having too many frequency bands will occupy too many resources of the control processor (FPGA or DSP) in the measuring instrument 102. Therefore, in this embodiment, the phase difference between the desired test signals in any two sub-frequency bands is smaller than the preset phase value. In one embodiment, the preset phase value may be 10°. As shown in FIG. 6, for a preset frequency band of 100 MHz, the number of divided sub-frequency bands is 10 (B1, B2, ..., B10). Those skilled in the art will understand that the preset phase value can be adjusted based on actual applications, and this embodiment is not limited thereto.

[0048] The desired test signal having the predetermined frequency band obtained by the measuring instrument 102 is a time-domain signal, and in this embodiment, the desired test signal having the predetermined frequency band needs to be converted from the time domain to the frequency domain, and in the frequency domain, the desired test signal having the predetermined frequency band is divided into multiple desired test signals having corresponding sub-frequency bands according to the frequency band. For example, the desired test signal having the predetermined frequency band can be converted from the time domain to the frequency domain by adopting a discrete Fourier transform.

[0049] In one embodiment, taking the wireless communication link between the measuring device 102 and the receiver port of the wireless device 200 as an example, the specific operation is as follows.

[0050] (2-1) A desired frequency band having a predetermined frequency band required for a wireless communication link between the k-th transmission port 103 of the measuring device 102 and the v-th transmission port 202 of the wireless device 200. JPEG2026502910000035.jpg14170

[0051] (2-2) From the kth transmission port 103 to the vth transmission port 202 of the wireless device 200 JPEG2026502910000036.jpg45170JPEG2026502910000037.jpg1554JPEG2026502910000038.jpg14170

[0052] JPEG2026502910000039.jpg22170

[0053] (3) The measuring device 102 establishes a virtual cable connection between the wireless device 200 and the test antenna 101, and loads the inverse matrix of the spatial transfer matrix corresponding to each sub-frequency band into the desired test signal corresponding to the corresponding sub-frequency band to obtain a transmission test signal corresponding to each sub-frequency band, so as to perform an air radiation test on the wireless device 200. The measuring device 102 performing the air radiation test on the wireless device 200 includes at least one of controlling the test antenna 101 to transmit a transmission test signal of a predetermined frequency band to the wireless device 200, so as to obtain the wireless receiving performance of the wireless device 200, or controlling the wireless device 200 to transmit a transmission test signal of a predetermined frequency band to the test antenna 101, so as to obtain the wireless transmitting performance of the wireless device 200.

[0054] In this embodiment, the measuring device 102 loads the inverse matrix of the spatial transfer matrix corresponding to each sub-frequency band in the frequency domain onto the desired test signal corresponding to the corresponding sub-frequency band, so that the transmission test signal corresponding to each sub-frequency band in the frequency domain needs to be further transformed into the time domain. For example, the transmission test signal corresponding to each sub-frequency band in the frequency domain can be transformed into the time domain using an inverse discrete Fourier transform.

[0055] In one embodiment, taking the wireless communication link between the measuring device 102 and the receiver port of the wireless device 200 as an example, the specific operations are as follows:

[0056] (3-1) Between the kth transmission port 103 of the measuring device 102 and the vth transmission port 202 of the wireless device 200 in the inverse matrix of the spatial transfer matrix corresponding to each sub-frequency band JPEG2026502910000040.jpg38170

[0057] Based on the following expression, each sub-frequency in the frequency domain of the wireless communication link between the k-th transmission port 103 of the measuring instrument 102 and the v-th transmission port 202 of the wireless device 200 is JPEG2026502910000041.jpg7128JPEG2026502910000042.jpg651.

[0058] JPEG2026502910000043.jpg7167 is converted from the frequency domain to the time domain, and the sub-frequency bands of the wireless communication link between the k-th transmission port 103 of the measuring instrument 102 and the v-th transmission port 202 of the wireless device 200 correspond to JPEG2026502910000044.jpg14170JPEG2026502910000045.jpg1146

[0059] (3-3) In one embodiment, the transmission test signals in each sub-frequency band of the kth transmission port 103 of the measuring instrument 102 are as follows: JPEG2026502910000046.jpg1429JPEG2026502910000047.jpg14170

[0060] In an embodiment of the present invention, a desired test signal having a relatively wide preset frequency band is divided into desired test signals corresponding to a number of sub-frequency bands, and then the inverse matrix of the spatial transfer matrix corresponding to each sub-frequency band is calculated and loaded into the desired test signal corresponding to the corresponding sub-frequency band, thereby realizing spatial radiation testing of wireless devices. This solves the problems of low isolation and low test accuracy when testing using the radiation two-stage (RTS) method, which are caused by the relatively high variations in amplitude and phase of the desired test signal having a relatively wide preset frequency band.

[0061] Referring to FIG. 7, FIG. 7 is a flowchart of a space radiation method for a wireless device in one embodiment. The space radiation method provided in this embodiment is applied to a measuring instrument, including steps 10 to 30, which will be described in detail below.

[0062] Step 10: Obtain the inverse matrix of the corresponding spatial transfer matrix in multiple sub-frequency bands between the measuring instrument and the wireless device.

[0063] In one embodiment, in the stage 10, obtaining the inverse of the spatial transfer matrix corresponding to the plurality of sub-frequency bands between the measurement device and the wireless device includes obtaining a downlink inverse matrix and / or an uplink inverse matrix, where the downlink inverse matrix is ​​the inverse of the spatial transfer matrix corresponding to the plurality of sub-frequency bands between the measurement device and the receiver of the wireless device, and the uplink inverse matrix is ​​the inverse of the spatial transfer matrix corresponding to the plurality of sub-frequency bands between the transmitter of the wireless device and the measurement device.

[0064] In one embodiment, obtaining the descending inverse matrix includes the following steps:

[0065] Step 11-1: Obtaining the change in amplitude of signals in each sub-frequency band received by each receiver port of the wireless device and transmitted from each transmitter port of the test device. This step requires multiple signal transmission and reception, and each time only one transmitter port transmits a signal and the other transmitter ports are turned off. In a single execution, one or more receiver ports of the wireless device may be controlled to receive the signal, or all antennas of the wireless device may be controlled to receive simultaneously, thereby improving efficiency. In one embodiment, obtaining the amplitude of signals received by each receiver port of the wireless device may be obtained through a power report of each receiver port of the wireless device, such as an RSSI (Reference Signal Strength Indicator) or RSRP (Reference Signal Received Power). In this embodiment, each execution may be controlled so that the test antenna transmitting the signal transmits the signal in each sub-frequency band one by one, so as to obtain the change in amplitude of signals received by each receiver port and transmitted from the transmitter port.

[0066] Step 12-1: Obtains the phase difference of signals in each sub-frequency band simultaneously transmitted from any two transmit ports of a measuring instrument and received by each receiver port of a wireless device. This step controls any two transmit ports to transmit signals in each sub-frequency band multiple times with different phase differences, thereby obtaining the amplitude of the combined signal received by each receiver port. Based on the amplitude of the signals in each sub-frequency band respectively transmitted from any two transmit ports received by each receiver port and the amplitude of the combined signal, the phase difference of signals in each sub-frequency band respectively transmitted from any two transmit ports received by each receiver port of the wireless device can be obtained. This step requires multiple signal transmission and reception, and each time two transmit ports transmit signals and the other transmit port channels are turned off. Optionally, in a single execution, one or more receiver ports of the wireless device may be controlled to receive signals, or all receiver ports may be controlled to receive simultaneously, thereby improving efficiency. In one embodiment, the phase difference is calculated by using Fourier series fitting or Fourier transform based on the amplitudes of the signals transmitted from any two transmit ports received by each receiver port of the wireless device and the amplitude of the combined signal (i.e., the signal transmitted jointly by the two transmit ports). In another embodiment, the phase difference is calculated by first calculating a combined amplitude reference value based on the amplitudes of the signals transmitted from any two transmit ports received by each receiver port of the wireless device. The combined amplitude reference value is a calculated value of the amplitude of the combined signal obtained when the transmitted signals are combined at each receiver port of the wireless device with different phase differences. Then, the phase difference is calculated based on the calculated combined amplitude reference value and the amplitude of the combined signal obtained by the test. In this embodiment, each time the method is executed, the two transmit ports transmitting signals may be controlled to transmit signals in each sub-frequency band one by one, so that the phase difference between the signals transmitted from any two transmit ports received by each receiver port of the wireless device is obtained.

[0067] Step 13-1: According to the amplitude change and phase difference corresponding to the signal of each sub-frequency band, obtain the inverse matrix of the corresponding spatial transmission matrix for multiple sub-frequency bands from the measuring device to the receiver of the wireless device. That is, each sub-frequency band corresponds to the inverse matrix of one spatial transmission matrix. It is only necessary to explain that the construction method of the inverse matrix of the spatial transmission matrix has been explained in detail in the above embodiment, so it will not be described here.

[0068] In one embodiment, obtaining the upward inverse matrix comprises: 11-2: Obtaining the change in amplitude of the signals in each sub-frequency band transmitted from each transmitter port 204 of the wireless device received by each receiver port of the measuring device; 12-2: Obtaining the phase difference of signals in each sub-frequency band simultaneously transmitted from any two transmitter ports 204 of the wireless device received by each receiving port of the measuring device; Step 12-3: This includes obtaining the inverse matrix of the spatial transfer matrix corresponding to the multiple sub-frequency bands between the receiver of the wireless device and the measuring device based on the amplitude change and phase difference corresponding to the signal in each sub-frequency band.

[0069] It is important to note that the operating state of the measuring instrument and the wireless device may be either a transmitting state or a receiving state, and the specific method of obtaining the downlink inverse matrix by the receiver performance test has been described in detail in the above embodiment. According to the principle of transmit and receive reciprocity, the test results obtained by the transmitter performance test and the receiver performance test should be consistent, so this embodiment does not go into detail about the specific method of obtaining the uplink inverse matrix by the transmitter performance test.

[0070] 20: Obtain a desired test signal having a predetermined frequency band, and divide the desired test signal having the predetermined frequency band into a plurality of corresponding sub-frequency bands according to the frequency band, where the frequency range consisting of the plurality of sub-frequency bands is the frequency range corresponding to the predetermined frequency band. In this embodiment, theoretically, the more sub-frequency bands the predetermined frequency band is divided into, the better. The more sub-frequency bands there are, the smaller the phase change of the signal in each sub-frequency band will be. However, too many sub-frequency bands will occupy too much of the control processor resources of the measuring instrument, so it is necessary to select one appropriate sub-frequency band data. In this embodiment, the desired test signal corresponding to multiple sub-frequency bands must satisfy the condition that the phase difference between any two corresponding sub-frequency bands is smaller than a predetermined phase value, which in this embodiment is 10°. It should be noted that in this embodiment, since the desired test signal having a predetermined frequency band in the frequency domain is divided into desired test signals corresponding to multiple sub-frequency bands according to the frequency band, the desired test signal having the predetermined frequency band needs to be first transformed from the time domain to the frequency domain, and then divided into desired test signals corresponding to multiple sub-frequency bands.

[0071] 30: A virtual cable connection is established between the measuring instrument and the wireless device, and the inverse matrix of the spatial transfer matrix corresponding to each sub-frequency band is loaded onto the desired test signal corresponding to the corresponding sub-frequency band to obtain a transmission test signal corresponding to each sub-frequency band, so as to perform a spatial radiation test on the wireless device. Performing a spatial radiation test on the wireless device by the measuring instrument includes at least one of controlling the test antenna to transmit a transmission test signal of a predetermined frequency band to the wireless device to obtain the wireless reception performance of the wireless device, or controlling the wireless device to transmit a transmission test signal of a predetermined frequency band to the test antenna to obtain the wireless transmission performance of the wireless device. In this embodiment, since the measuring instrument loads the inverse matrix of the spatial transfer matrix corresponding to each sub-frequency band in the frequency domain onto the desired test signal corresponding to the corresponding sub-frequency band, it is further necessary to transform the transmission test signal corresponding to each sub-frequency band in the frequency domain into the time domain. For example, the transmission test signal corresponding to each sub-frequency band in the frequency domain can be transformed into the time domain using an inverse discrete Fourier transform.

[0072] Referring to FIG. 8, the embodiment of the present invention further provides a measuring instrument including: an inverse matrix obtaining module 1001, a sub-frequency band obtaining module 1002, and an inverse matrix loading module 1003.

[0073] The inverse matrix acquisition module 1001 is for obtaining the inverse matrix of the corresponding spatial transfer matrix in multiple sub-frequency bands between the measuring instrument and the wireless device.

[0074] The sub-frequency band acquiring module 1002 is for obtaining a desired test signal having a predetermined frequency band, and dividing the desired test signal having the predetermined frequency band into desired test signals corresponding to a plurality of sub-frequency bands according to the frequency band, wherein the frequency range consisting of the plurality of sub-frequency bands is the frequency range corresponding to the predetermined frequency band.

[0075] The inverse matrix loading module 1003 is for establishing a virtual cable connection between the measuring instrument and the wireless device, and loading the inverse matrix of the spatial transfer matrix corresponding to each sub-frequency band onto the desired test signal corresponding to the corresponding sub-frequency band to obtain the transmission test signal corresponding to each sub-frequency band, so as to perform a spatial emission test on the wireless device.

[0076] Each module in the measuring device provided in this embodiment corresponds to the steps in the method in the above embodiment, and the specific implementation thereof has been described in detail in the above embodiment, so it will not be described here in detail.

[0077] Those skilled in the art will understand that all or part of the functions of the various methods in the above embodiments may be implemented in hardware or in a computer program. When all or part of the functions in the above embodiments are implemented in a computer program, the program may be stored in a computer-readable storage medium, which may include a ROM, RAM, magnetic disk, optical disk, hard disk, etc., and the computer executes the program to implement the functions. For example, the program may be stored in the memory of a device, and the processor may execute the program in the memory to implement all or part of the functions. Furthermore, when all or part of the functions in the above embodiments are implemented in a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash memory, or a portable hard disk, or may be downloaded or copied and stored in the memory of a local device. Alternatively, the system of the local device may be upgraded, and the processor may execute the program in the memory to implement all or part of the functions in the above embodiments.

[0078] Although the present invention has been described in detail above using specific examples, the above description is for the purpose of understanding the present invention and is not intended to limit the present invention. Those skilled in the art may easily make some estimations, modifications, or substitutions based on the concept of the present invention.

Claims

1. a measuring instrument and at least two test antennas; the test antenna is for establishing a wireless communication link between the measuring device and the wireless device so that the measuring device and the wireless device communicate wirelessly; The measuring instrument obtaining an inverse matrix of a corresponding spatial transfer matrix in a plurality of sub-frequency bands between the measuring device and the wireless device; obtaining a desired test signal having a predetermined frequency band; dividing the desired test signal having the predetermined frequency band into desired test signals having a plurality of corresponding sub-frequency bands according to the frequency band, wherein a frequency range consisting of the plurality of sub-frequency bands is a frequency range corresponding to the predetermined frequency band; a virtual cable connection is established between the measuring instrument and the wireless device, and a spatial radiation test is performed on the wireless device by loading an inverse matrix of a spatial transfer matrix corresponding to each of the sub-frequency bands onto a desired test signal corresponding to the corresponding sub-frequency band, thereby obtaining a transmission test signal corresponding to each sub-frequency band.

2. 2. The spatial radiation test system of claim 1, wherein obtaining an inverse matrix of a spatial transmission matrix corresponding to a plurality of sub-frequency bands between the measuring instrument and the wireless device includes obtaining an inverse matrix of a downlink and / or an inverse matrix of an uplink.

3. Obtaining the descending inverse matrix comprises: obtaining a change in amplitude of the signals in each sub-frequency band transmitted from each transmitting port of the measuring device and received by each receiving port of the wireless device; Obtaining a phase difference between signals in each sub-frequency band simultaneously transmitted from any two transmitting ports of the measuring device and received by each receiving port of the wireless device; 3. The spatial radiation test system according to claim 2, further comprising: obtaining an inverse matrix of a spatial transfer matrix corresponding to a plurality of sub-frequency bands between the measuring instrument and a receiver of the wireless device based on the change in amplitude and the phase difference corresponding to the signal in each sub-frequency band.

4. Obtaining the upward inverse matrix comprises: Obtaining a change in amplitude of the signals in each sub-frequency band transmitted from each transmitter port of the wireless device and received by each receiver port of the measuring device; Obtaining a phase difference between signals in each sub-frequency band simultaneously transmitted from any two transmitter ports of the wireless device and received by each receiver port of the measuring device; 3. The spatial radiation test system according to claim 2, further comprising: obtaining an inverse matrix of a spatial transmission matrix corresponding to a plurality of sub-frequency bands between a transmitter of the wireless device and the measuring instrument based on the change in amplitude and the phase difference corresponding to the signal in each sub-frequency band.

5. Dividing the desired test signal having the predetermined frequency band into desired test signals having a plurality of corresponding sub-frequency bands according to the frequency band includes:

2. The spatial radiation test system of claim 1, further comprising: transforming the desired test signal having the predetermined frequency band from a time domain to a frequency domain; and dividing the desired test signal having the predetermined frequency band into a plurality of desired test signals having corresponding sub-frequency bands according to the frequency band in the frequency domain.

6. 6. The spatial radiation test system according to claim 5, wherein the desired test signals corresponding to the plurality of sub-frequency bands must satisfy a condition that the phase difference between the desired test signals corresponding to any two of the sub-frequency bands is smaller than a preset phase value.

7. Loading the inverse matrix of the spatial transfer matrix corresponding to each sub-frequency band onto the desired test signal corresponding to the corresponding sub-frequency band to obtain the transmission test signal corresponding to each sub-frequency band, Loading the inverse matrix of the spatial transfer matrix corresponding to each sub-frequency band onto the desired test signal corresponding to the corresponding sub-frequency band to obtain a transmission test signal corresponding to each sub-frequency band in the frequency domain; 6. The spatial radiation test system according to claim 5, further comprising: converting a transmission test signal corresponding to each sub-frequency band in the frequency domain from the frequency domain to the time domain to obtain a transmission test signal corresponding to each sub-frequency band.

8. Obtaining an inverse matrix of a spatial transfer matrix corresponding to a plurality of sub-frequency bands between the measuring device and the wireless device; Obtain a desired test signal having a predetermined frequency band, and divide the desired test signal having the predetermined frequency band into desired test signals having a plurality of corresponding sub-frequency bands according to the frequency band, wherein a frequency range consisting of the plurality of sub-frequency bands is a frequency range corresponding to the predetermined frequency band; a method for performing a spatial radiation test on a wireless device, the method comprising: establishing a virtual cable connection between the measuring instrument and the wireless device; and loading an inverse matrix of a spatial transfer matrix corresponding to each of the sub-frequency bands onto a desired test signal corresponding to the corresponding sub-frequency band, thereby obtaining a transmission test signal corresponding to each sub-frequency band, so as to perform a spatial radiation test on the wireless device.

9. 9. The method for spatial radiation testing according to claim 8, wherein obtaining an inverse matrix of a corresponding spatial transfer matrix in a plurality of sub-frequency bands between the measuring instrument and the wireless device includes obtaining a downstream inverse matrix and / or obtaining an upstream inverse matrix.

10. Obtaining the descending inverse matrix comprises: obtaining a change in amplitude of the signals in each sub-frequency band transmitted from each transmitting port of the measuring device and received by each receiving port of the wireless device; Obtaining a phase difference between signals in each sub-frequency band simultaneously transmitted from any two transmitting ports of the measuring device and received by each receiving port of the wireless device; 10. The method for spatial radiation testing according to claim 9, further comprising obtaining an inverse matrix of a spatial transfer matrix corresponding to a plurality of sub-frequency bands between the measuring instrument and a receiver of the wireless device based on the change in amplitude and the phase difference corresponding to the signal in each sub-frequency band.

11. Obtaining the upward inverse matrix comprises: Obtaining a change in amplitude of the signals in each sub-frequency band transmitted from each transmitter port of the wireless device and received by each receiver port of the measuring device; Obtaining a phase difference between signals in each sub-frequency band simultaneously transmitted from any two transmitter ports of the wireless device and received by each receiver port of the measuring device; 10. The method for spatial radiation testing according to claim 9, further comprising obtaining an inverse matrix of a spatial transfer matrix corresponding to a plurality of sub-frequency bands between a transmitter of the wireless device and the measuring instrument, based on the change in amplitude and the phase difference corresponding to a signal in each sub-frequency band.

12. Dividing the desired test signal having the predetermined frequency band into desired test signals having a plurality of corresponding sub-frequency bands according to the frequency band includes:

9. The method for spatial radiation testing according to claim 8, further comprising: transforming the desired test signal having the predetermined frequency band from a time domain to a frequency domain; and dividing the desired test signal having the predetermined frequency band into desired test signals having corresponding sub-frequency bands according to the frequency band in the frequency domain.

13. Loading the inverse matrix of the spatial transfer matrix corresponding to each sub-frequency band onto the desired test signal corresponding to the corresponding sub-frequency band to obtain the transmission test signal corresponding to each sub-frequency band, Loading the inverse matrix of the spatial transfer matrix corresponding to each sub-frequency band onto the desired test signal corresponding to the corresponding sub-frequency band to obtain a transmission test signal corresponding to each sub-frequency band in the frequency domain; 13. The method for spatial radiation testing according to claim 12, further comprising: converting a transmission test signal corresponding to each sub-frequency band in the frequency domain from the frequency domain to the time domain to obtain a transmission test signal corresponding to each sub-frequency band.

14. an inverse matrix acquisition module for obtaining an inverse matrix of a corresponding spatial transfer matrix in a plurality of sub-frequency bands between the measuring instrument and a wireless device; a sub-frequency band acquisition module for acquiring a desired test signal having a predetermined frequency band, and dividing the desired test signal having the predetermined frequency band into desired test signals having a plurality of corresponding sub-frequency bands according to the frequency band, wherein a frequency range consisting of the plurality of sub-frequency bands is a frequency range corresponding to the predetermined frequency band; an inverse matrix loading module that loads an inverse matrix of the spatial transfer matrix corresponding to each sub-frequency band onto a desired test signal corresponding to the corresponding sub-frequency band to obtain a transmission test signal corresponding to each sub-frequency band, so as to establish a virtual cable connection between the measuring instrument and the wireless device and perform a spatial radiation test on the wireless device; A measuring instrument comprising:

15. A computer-readable storage medium having a program stored therein, the program being executable by a processor to implement the spatial radiation testing method according to any one of claims 8 to 13.

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