CN116112101A - Air radiation test system, method and tester for wireless equipment - Google Patents
Air radiation test system, method and tester for wireless equipment Download PDFInfo
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Abstract
The utility model provides an aerial radiation test system, method and tester of wireless device, firstly acquire the inverse matrix of the space transmission matrix that corresponds at a plurality of sub-frequency channels between tester and the wireless device, then divide the expected test signal that has the preset frequency channel into the expected test signal that corresponds at a plurality of sub-frequency channels according to the frequency channel, load the inverse matrix of the space transmission matrix that corresponds to each sub-frequency channel into the expected test signal that corresponds to corresponding sub-frequency channel at last, establish virtual cable connection between tester and wireless device, realize carrying out aerial radiation test to wireless device, the problem that the amplitude and the unevenness of phase are higher in the expected test signal that has the preset frequency channel of broad bandwidth, and the isolation is low when using the radiation two-stage (RTS) method to carry out the test that results in, the test precision is low is solved.
Description
Technical Field
The invention relates to the field of communication testing, in particular to an air radiation testing system, an air radiation testing method and an air radiation testing instrument for wireless equipment.
Background
Modern wireless technologies use MIMO (multi-input multi-output) technology in order to increase the data transmission speed. The MIMO wireless device has at least two receiver ports (connected to receive antennas) or/and a transmitter port (connected to transmit antennas). The MIMO OTA test is a multi-antenna complete machine performance test method, and the method measures the receiving performance of wireless equipment by simulating a channel model and realizing a complex electromagnetic environment in an anechoic chamber.
As shown in fig. 1, the base station has M transmitting antennas, the wireless device as a terminal has N receiving antennas, a signal is transmitted from a transmitting port of the base station to a receiver port of the wireless device, and various paths including a direct path and a reflected path are passed, and basic parameters of the MIMO channel model include power distribution, an emission angle (AoA), an angle of arrival (AoD), a time delay, a doppler effect, etc., which are defined in detail in 3GPP, and a channel model h between an mth transmitting port in the base station and an nth receiver port in the terminal n,m (t) can be described as follows:
wherein L is one of the L sub-paths, t is time, and f is the center frequency of the test; ψl, Φ l And τ l The main phase, doppler effect and time delay of the first sub-path are respectively;
and->
(x represents antenna polarization) is the antenna gain, alpha, of the nth receiving antenna of the terminal and the mth transmitting antenna of the base station, respectively l,AoA ，β l,AoD And->
Is AoA, aoD and path loss from antenna polarization y to x in the l-th sub-path.
In conventional MIMO testing, taking 2×2MIMO testing as an example, as shown in fig. 2, a cable is generally used to directly connect an output port of a channel simulator with an antenna port of a wireless terminal, an antenna pattern of the wireless terminal is integrated into the channel simulator to perform calculation, and finally a test signal is fed into the antenna port of the wireless terminal through the cable to implement MIMO performance measurement of the wireless terminal. However, this test approach creates the following 2 problems:
(1) The isolation between two antenna links of the wireless terminal is high due to the conduction mode, and the isolation between the two antennas is limited when the wireless terminal actually works;
(2) The influence of the noise of the wireless terminal itself on the MIMO performance (i.e., the sense in the related art) cannot be reflected in the test result.
In summary, compared with the whole machine OTA measurement, the state of the wireless terminal is different, the OTA measurement cannot be replaced by a conduction method, in addition, along with the wide application of millimeter waves, a plurality of millimeter wave antennas are directly arranged on a millimeter wave module (AiP), and the whole module has no conduction interface, so that the MIMO measurement of the millimeter waves cannot be realized in a conduction mode.
MIMO OTA testing methods in the 3GPP and CTIA standards include a radiated two-phase (RTS) method and a multi-probe anechoic room (MPAC) method. The MPAC method directly realizes the simulation of the channel model through the spatial distribution of the test probe. The RTS method enables the link connection between the transmitter and the receiver to be in one-to-one correspondence in a mode of ' air interface direct connection ' (air interface direct connection), and is similar to the connection through a cable (also called as a virtual cable '), the mode meets the requirement of complete machine test, the coupling between antennas and the noise interference between hardware and the antennas are reserved, and the MIMO performance of the wireless terminal is reflected more truly.
Disclosure of Invention
The invention mainly solves the technical problem how to execute the air radiation test on the wireless device.
According to a first aspect, in one embodiment there is provided an aerial radiation test system for a wireless device, wherein the aerial radiation test system comprises a tester and at least two test antennas, wherein:
the test antenna is used for establishing a wireless communication link between the tester and the wireless device so as to enable the tester to wirelessly communicate with the wireless device;
the tester is configured to:
acquiring an inverse matrix of a space transmission matrix corresponding to a plurality of sub-frequency bands between the tester and the wireless equipment;
acquiring an expected test signal with a preset frequency band, and dividing the expected test signal with the preset frequency band into expected test signals corresponding to a plurality of sub-frequency bands according to the frequency band; the frequency range formed by the plurality of sub-frequency bands is a frequency range corresponding to the preset frequency band;
and loading the inverse matrix of the space transmission matrix corresponding to each sub-band into expected test signals corresponding to the corresponding sub-band to obtain emission test signals corresponding to each sub-band, so as to establish virtual cable connection between the tester and the wireless equipment, and executing air radiation test on the wireless equipment.
According to a second aspect, in one embodiment, there is provided an over-the-air radiation testing method of a wireless device, wherein the over-the-air radiation testing method includes:
acquiring inverse matrixes of space transmission matrixes corresponding to a plurality of sub-frequency bands between the tester and the wireless equipment;
acquiring an expected test signal with a preset frequency band, and dividing the expected test signal with the preset frequency band into expected test signals corresponding to a plurality of sub-frequency bands according to the frequency band; the frequency range formed by the plurality of sub-frequency bands is a frequency range corresponding to the preset frequency band;
and loading the inverse matrix of the space transmission matrix corresponding to each sub-band into expected test signals corresponding to the corresponding sub-band to obtain emission test signals corresponding to each sub-band, so as to establish virtual cable connection between the tester and the wireless equipment, and executing air radiation test on the wireless equipment.
According to a third aspect, an embodiment provides a tester, including:
the inverse matrix acquisition module is used for acquiring inverse matrixes of the space transmission matrixes corresponding to the plurality of sub-frequency bands between the tester and the wireless equipment;
the sub-frequency band acquisition module is used for acquiring expected test signals with preset frequency bands, and dividing the expected test signals with the preset frequency bands into expected test signals corresponding to a plurality of sub-frequency bands according to the frequency bands; the frequency range formed by the plurality of sub-frequency bands is a frequency range corresponding to the preset frequency band;
And the inverse matrix loading module is used for loading the inverse matrix of the space transmission matrix corresponding to each sub-frequency band into expected test signals corresponding to the corresponding sub-frequency band to obtain emission test signals corresponding to each sub-frequency band so as to establish virtual cable connection between the tester and the wireless equipment and execute air radiation test on the wireless equipment.
According to a fourth aspect, an embodiment provides a computer readable storage medium having stored thereon a program executable by a processor to implement an over-the-air radiation testing method as described in any of the embodiments above.
According to the system, the method and the tester for testing the air radiation of the wireless device, the inverse matrix of the space transmission matrix corresponding to the plurality of sub-frequency bands between the tester and the wireless device is obtained, the expected test signal with the preset frequency band is divided into the expected test signals corresponding to the plurality of sub-frequency bands according to the frequency band, and finally the inverse matrix of the space transmission matrix corresponding to each sub-frequency band is loaded into the expected test signal corresponding to the corresponding sub-frequency band, so that virtual cable connection is established between the tester and the wireless device, and the air radiation test is implemented on the wireless device.
Drawings
Fig. 1 is a schematic diagram of a MIMO channel model in the prior art;
FIG. 2 is a schematic diagram of a conventional 2×2 Multiple Input Multiple Output (MIMO) test system;
FIG. 3 is a schematic diagram of a 2×2 Multiple Input Multiple Output (MIMO) test system for cross signals;
FIG. 4 is a schematic diagram of a 2×2 Multiple Input Multiple Output (MIMO) test system for a total transmit matrix;
FIG. 5 is a schematic diagram of an air radiation test system of a wireless device according to one embodiment;
FIG. 6 is a diagram illustrating a desired test signal having a predetermined frequency band divided into a plurality of sub-bands;
FIG. 7 is a flow chart of a method of over-the-air radiation testing of a wireless device according to one embodiment;
FIG. 8 is a schematic diagram of a tester according to an embodiment.
Detailed Description
The invention will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.
A radiation two-phase (RTS) method in the MIMO OTA test method is described below.
In MIMO OTA testing, the expression of the transmitted test signal and the received test signal is:
y(t)＝H(t)*x(t)
wherein y (t) is a received test signal, x (t) is a transmitted test signal, H (t) is a spatial transmission matrix, and when performing a reception performance test of the wireless device, taking an n×n test system composed of N test antennas and N receiver ports of the wireless device as an example, the spatial transmission matrix H (t) has the expression:
Wherein h is 1,1 (t) represents the transmission parameters corresponding to the communication link between the 1 st transmit port of the tester (connected to the 1 st test antenna, the same applies hereinafter) to the 1 st receiver port of the wireless device, h 1,N (t) represents a transmission parameter corresponding to a communication link between an nth transmitting port of the tester (connected to an nth test antenna, the same applies hereinafter) to a 1 st receiver port of the wireless device, h N,1 (t) represents a transmission parameter corresponding to a communication link between a 1 st transmitting port of the tester and an N-th receiver port of the wireless device, h N,N (t) represents the range between the Nth transmit port of the tester to the Nth receiver port of the wireless deviceTransmission parameters corresponding to the communication link of (a).
Because cross transmission exists between the test antenna and the receiver port of the wireless device, the elimination of cross signals caused by the cross transmission is realized by loading the inverse matrix M (t) of the space transmission matrix at the front end of the transmitting port of the tester, and the expression of the inverse matrix M (t) of the space transmission matrix in an N multiplied by N system is as follows:
wherein m is 1,1 (t) represents the inverse transmission parameter, m, corresponding to the communication link between the 1 st transmit port of the tester to the 1 st receiver port of the wireless device 1,N (t) represents the inverse transmission parameter, m, corresponding to the communication link between the Nth transmit port of the tester to the 1 st receiver port of the wireless device N,1 (t) represents the inverse transmission parameter, m, corresponding to the communication link between the 1 st transmit port of the tester to the N-th receiver port of the wireless device N,N (t) represents inverse transmission parameters corresponding to a communication link between an nth transmit port of the tester to an nth receiver port of the wireless device.
Taking the test of the receiving performance of 2×2MIMO as an example, as shown in fig. 3, the base station simulator and the channel simulator in the tester process in combination with the antenna pattern to obtain the transmission signal, and when the test is performed, the transmission signal required is the signal transmitted from the transmission port 1 of the tester to the receiver port 1 of the wireless device and the signal transmitted from the transmission port 2 of the tester to the receiver port 2 of the wireless device, so that the cross signal transmitted from the transmission port 1 to the receiver port 2 of the wireless device and the cross signal transmitted from the transmission port 2 to the receiver port 1 of the wireless device are the interference signal in the MIMO test. The spatial transmission matrix H in a 2 x 2 test system can be written as:
the test signal integrated with the channel model cannot be properly transmitted to the receiver ports of the wireless device due to the presence of the cross links. Therefore, the inverse matrix is used to eliminate the effect of cross transmission, and the 'air interface direct connection', namely virtual cable connection, between the tester and the wireless device is realized. The inverse matrix may be implemented by amplifiers, attenuators, and phase shifters (or digital signal processing) in the channel simulator.
After loading the inverse of the spatial transmission matrix, the relationship between the transmitted signal and the received signal becomes:
y(t)＝[H(t)M(t)]*x(t)
as shown in fig. 4, the total transmission matrix T of the 2×2MIMO system is defined as:
wherein,,
in the ideal case, the T matrix is a unitary matrix, i.e., T 11 ＝t 22 ＝1，t 12 ＝t 21 At this time, the test signal sent from the transmitting port 1 of the tester is transmitted only to the receiver port 1 of the wireless device, the test signal sent from the transmitting port 2 of the tester is transmitted only to the receiver port 2 of the wireless device, and the cross signal is eliminated due to the introduction of the inverse matrix. In the practical link, due to reasons such as signal reflection, limited power and limited phase adjustment precision in the test system, the cross signal cannot be completely eliminated, so in order to evaluate the influence of the cross channel on the test precision, the related technology introduces the concept of isolation, the isolation describes the amplitude relationship between the cross signal and the expected signal, and the isolation is defined as follows:
Ios 1 ＝|t 11 /t 12 |
Ios 2 ＝|t 22 /t 21 |
Ios t ＝min(Ios 1 ,Ios 2 )
wherein, ios 1 And Ios 2 Ios representing the ratio of the desired signal to the cross signal of receiver port 1 of the wireless device and receiver port 2 of the wireless device, respectively t Is the system isolation of a 2 x 2MIMO test system. When the isolation reaches a certain preset value, the good 'air interface direct connection' can be realized. In MIMO OTA testing, isolation is one of the important factors affecting the test error, and 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.
Therefore, the RTS method first obtains the antenna radiation pattern and the spatial transmission matrix of the wireless device, then obtains the inverse matrix of the spatial transmission matrix, introduces the calculation of the inverse matrix into the test signal to cancel the spatial transmission matrix, and realizes "air interface direct connection" between the base station simulator (Base station emulator, BSE) and the wireless device under test (Device under test, DUT) to perform MIMO OTA test.
As the communication bandwidth increases and the design of the communication link becomes increasingly complex, amplitude-phase unevenness in the link causes a decrease in isolation of the receiver ports of the wireless device within the bandwidth, thereby posing a serious challenge to MIMO measurements. Radio frequency components in the link, such as radio frequency cables, amplifiers, attenuators, filters, etc., modulate amplitude and phase differently within the bandwidth. When the test signal is a narrowband signal, signal distortion caused by such modulation is not obvious, but as the bandwidth increases, the amplitude and phase of different signals in the bandwidth reaching the test center change greatly at different frequencies, and the amplitude-phase unevenness in the broadband can cause larger test errors when MIMO test is performed, whether the prior art radiation two-stage (RTS) method or the multi-probe anechoic chamber (MPAC) method is applied.
In the 4G MIMO test, the test signal is a narrowband signal (the frequency is less than or equal to 20 MHz), and since the variation of the amplitude and phase in the frequency band of the narrowband signal is small, the consistency with the center frequency is good, and the inverse matrix of the spatial transmission matrix obtained according to the center frequency of the frequency band according to the RTS method can achieve good isolation (for example, more than 20 dB) in the whole frequency band, the amplitude and phase flatness problem can be ignored. In the 5G wideband MIMO test, as the system bandwidth increases, the amplitude and phase change dramatically in a wide frequency band, if the inverse matrix of the spatial transmission matrix calculated according to the center frequency of the frequency band according to the RTS method is applied in the entire wide frequency band, the isolation of the antenna is poor, so that "air interface direct connection" is difficult to be implemented, resulting in high uncertainty of the MIMO test, and even failing to evaluate the real performance of the tested wireless device.
In the embodiment of the invention, the wide-band test signal is divided into a plurality of narrow-band test signals, the inverse matrix of the space transmission matrix is calculated in each narrow-band, and the inverse matrix of the space transmission matrix is loaded into the narrow-band test signals so as to realize the air radiation test of the wireless equipment.
Referring to fig. 5, an embodiment of the present invention provides an air radiation test system for a wireless device, wherein the wireless device 200 is a tested wireless device, and the wireless device 200 has at least two receiver ports 202 (transmitter ports 203), and each receiver port 202 (transmitter port 203) is connected to a receiving/transmitting antenna 201. The aerial radiation test system provided in this embodiment includes: test antenna 101 and tester 102, tester 101 has at least two transmit ports 103 (receive ports 104), each transmit port 103 (receive port 104) being connected to one test antenna 101, test antenna 101 establishing a wireless communication link between tester 102 and wireless device 200 to enable wireless communication of tester 102 with wireless device 200. Tester 102 is connected to test antenna 101, wireless device 200 by a cable connection or wireless connection. Anechoic chamber 300 is used to provide an electromagnetic environment for testing. In fig. 5, the tester 102 is disposed inside the anechoic chamber 300, and in other embodiments, the tester 102 may be disposed outside the anechoic chamber 300.
(one) obtaining an inverse matrix of a spatial transmission matrix between the tester 102 and the wireless device 200 corresponding to a plurality of sub-bands.
In one embodiment, obtaining an inverse of the spatial transmission matrix between tester 102 and wireless device 200 for a plurality of sub-bands includes: and acquiring a downlink inverse matrix and/or acquiring an uplink inverse matrix. The downlink inverse matrix is an inverse matrix of a spatial transmission matrix corresponding to a plurality of sub-bands between the tester 102 and the receiver of the wireless device 200, and the uplink inverse matrix is an inverse matrix of a spatial transmission matrix corresponding to a plurality of sub-bands between the transmitter of the wireless device 200 and the tester, which will be described in detail below.
(1) The wireless device 200 acquires the downstream inverse matrix when performing the reception performance test in the following manner.
Each transmit port 103 of the tester 102 transmits a respective sub-band signal, and each receiver port 201 of the acquisition wireless device 200 receives a change in the amplitude of the respective sub-band signal transmitted by each transmit port 103 of the tester 102. In this embodiment, the transmitting port 103 of the current transmitting signal is taken as the current transmitting port 103, at this time, other transmitting ports 103 are in a closed state, when the current transmitting port 103 transmits signals, the current transmitting port 103 can be controlled to transmit each sub-band signal one by one, for when the current transmitting port 103 transmits current sub-band signals, one or more receiver ports 201 of the wireless device 200 can be controlled to receive the current sub-band signals, or all receiver ports 201 of all wireless devices 200 can be controlled to simultaneously receive the current sub-band signals, after all receiver ports 201 of the wireless device 200 receive the amplitude variation of the current sub-band signals, the current transmitting port 103 is controlled to transmit the next sub-band signals, and finally the amplitude variation of each sub-band signal transmitted by the current test antenna 101 received by all receiver ports 201 of the wireless device 200 is obtained. Similarly, the other transmitting ports 103 are used as the current transmitting port 103 one by one, so that the amplitude variation of each sub-band signal transmitted by each transmitting port 103 received by each receiver port 201 of the wireless device 200 can be obtained.
Any two transmitting ports 103 of the tester 102 transmit each sub-band signal for a plurality of times with different phase differences, and the phase differences of the sub-band signals respectively transmitted by any two transmitting ports 103 received by each receiver port 201 of the wireless device 200 are obtained. In this embodiment, the transmitting port 103 of the current transmitting signal is used as the first current transmitting port 103 and the second current transmitting port 103, the other transmitting ports 103 are in the closed state, when the first current transmitting port 103 and the second current transmitting port 103 transmit the current sub-band signal with different phase differences, one or more receiver ports 201 of the wireless device 200 may be controlled to receive the current sub-band signal, or all receiver ports 201 of the wireless device 200 may be controlled to simultaneously receive the current sub-band signal, after the phase differences of the current sub-band signal received by the receiver ports 201 of the wireless device 200 are obtained, the first current transmitting port 103 and the second current transmitting port 103 are controlled to transmit the next sub-band signal for multiple times with different phase differences, and finally the phase differences of the sub-band signals transmitted by the first current transmitting port 103 and the second current transmitting port 103 are obtained by all receiver ports 201 of the wireless device 200. Similarly, the other arbitrary two transmitting ports 103 are used as the first current transmitting port 103 and the second current transmitting port 103 one by one, so that the phase difference of the signals of the sub-frequency bands transmitted by the arbitrary two transmitting ports 103 received by each receiver port 201 of the wireless device 200 can be obtained.
In one embodiment, the phase difference that the receiver port 201 of the wireless device 200 receives the current sub-band signal is calculated as: the phase difference is calculated by fourier series fitting or fourier transform according to the amplitude of the current sub-band signal received by each receiver port 202 of the wireless device 200 and transmitted by the first current transmission port 103 and the second current transmission port 103, respectively, and the amplitude of the synthesized signal (i.e., the signal transmitted by the first current transmission port 103 and the second current transmission port 103 in common). In another embodiment, the phase difference may be calculated by: first, a synthesized amplitude reference value is calculated according to the amplitudes of the current sub-band signals respectively transmitted by the first current transmission port 103 and the second current transmission port 103 received by each receiver port 202 of the wireless device 200, wherein the synthesized amplitude reference value is an amplitude calculated value of a synthesized signal obtained when the aforementioned respectively transmitted current sub-band signals are synthesized at each receiver port 202 of the wireless device 200 with different phase differences; then, the phase difference is calculated according to the calculated synthesized amplitude reference value and the amplitude of the synthesized signal obtained by the test.
The spatial transmission matrix corresponding to a plurality of sub-bands between the transmitting port 103 of the tester 102 and the receiver port 202 of the wireless device 200 is determined by the amplitude variation and the phase difference of each sub-band signal transmitted by the tester 102 received by the wireless device 200, so as to obtain the inverse matrix of the spatial transmission matrix.
In an embodiment, taking n transmitting ports 103 and n receiver ports 202 as an example, the spatial transmission matrix corresponding to the ith sub-band is obtained according to the following expression:
wherein f i The center frequency of the ith sub-band is represented, I is the index number of the sub-band, i=1, 2, …, I is the number of the sub-bands; p is p vk Representing the change in amplitude of the signal sent out by kth transmit port 103 to kth receiver port 202,
representing the phase difference of the signal sent out by the kth transmit port 103 to the kth receiver port 202, v=1, 2, …, n, k=1, 2, …, n.
From the spatial transmission matrix corresponding to the ith sub-band, the inverse matrix M of the spatial transmission matrix corresponding to the ith sub-band can be obtained as follows i (f i ) The method comprises the following steps:
wherein f i Representing the center frequency of the ith sub-band, i being the index of the sub-bandNumber i=1, 2,., I, the number of sub-bands; m is m i,vk (f i ) Representing the inverse transmission parameters of the signal sent out by the kth transmit port 103 to the kth receiver port 202.
In this embodiment, the inverse matrix M of the wideband spatial transmission matrix corresponding to the preset frequency band can be obtained according to the following expression W ：
Wherein m' v,k ＝[m 1,vk (f 1 )…m i,vk (f i )…m I,vk (f I )]；m′ v,k Indicating that the wireless communication link between kth transmit port 103 and kth receiver port 202 is at frequency f 1 ,…,f i ,…f I Is the inverse of the transmission matrix of (a). That is, m' v,k In practice, it is a vector, and each value in the vector is an inverse transmission parameter corresponding to each subband.
(2) The wireless device 200 acquires the upstream inverse matrix when performing the transmission performance test in the following manner.
Each transmitter port 204 of the wireless device 200 transmits a respective sub-band signal, and the amplitude variation of the respective sub-band signal received by each receiving port 104 of the tester 102 and transmitted by each transmitter port 204 of the wireless device 200 is obtained. In this embodiment, the transmitter port 204 of the current transmitting signal is taken as the current transmitter port 204, at this time, the other transmitter ports 204 are in a closed state, when the current transmitter port 204 transmits signals, the current transmitter port 204 can be controlled to transmit each sub-band signal one by one, when the current transmitter port 204 transmits current sub-band signals, one or more receiving ports 104 of the tester 102 can be controlled to receive the current sub-band signals, or all receiving ports 104 of all testers 102 can be controlled to simultaneously receive the current sub-band signals, after all receiving ports 104 of the testers 102 receive the amplitude change of the current sub-band signals, the current transmitter port 204 is controlled to transmit the next sub-band signals, and finally the amplitude change of each sub-band signal transmitted by the current transmitter port 204 is obtained, which is received by all receiving ports 104 of the testers 102. Similarly, the other transmitter ports 204 are used as the current transmitter port 204 one by one, so as to obtain the amplitude variation of each sub-band signal transmitted by each transmitter port 204 received by each receiving port 104 of the tester 102.
Any two transmitter ports 204 of the wireless device 200 transmit the respective sub-band signals multiple times with different phase differences, and the phase differences of the respective sub-band signals respectively transmitted by any two transmitter ports 204 received by each receiving port 104 of the tester 102 are obtained. In this embodiment, the transmitter port 204 of the current transmitting signal is used as the first current transmitter port 204 and the second current transmitter port 204, the other transmitter ports 204 are in the closed state, when the first current transmitter port 204 and the second current transmitter port 204 transmit the current sub-band signal with different phase differences, one or more receiving ports 104 of the tester 102 can be controlled to receive the current sub-band signal, or all receiving ports 104 of the tester 102 can be controlled to simultaneously receive the current sub-band signal, after the phase differences of the receiving ports 104 of the tester 102 receive the current sub-band signal are obtained, the first current transmitter port 204 and the second current transmitter port 204 are controlled to transmit the next sub-band signal with different phase differences for multiple times, and finally the phase differences of the sub-band signals transmitted by the first current transmitter port 204 and the second current transmitter port 204 are obtained, which are received by all receiving ports 104 of the tester 102. Similarly, any two other transmitter ports 204 are used as the first current transmitter port 204 and the second current transmitter port 204 one by one, so that the phase difference of the signals of each sub-frequency band transmitted by any two transmitter ports 204 received by each receiving port 104 of the tester 102 can be obtained.
The amplitude change and the phase difference of each sub-band signal transmitted by the wireless device 200 received by the tester 102 determine the spatial transmission matrix between the transmitter port 204 of the wireless device and the tester corresponding to a plurality of sub-bands, thereby obtaining the inverse matrix of the spatial transmission matrix.
It should be noted that, the working states of the tester and the wireless device may be a transmitting state or a receiving state, the specific manner of obtaining the downlink inverse matrix through the receiving performance test has been described in detail in the foregoing embodiments, and it is known from the principle of transception and transception, and the test results obtained by the transmitting performance test and the receiving performance test should be consistent, so the embodiment will not be repeated with a specific manner of obtaining the uplink inverse matrix through the transmitting performance test.
(II) the tester 102 acquires expected test signals with preset frequency bands, and divides the expected test signals with the preset frequency bands into expected test signals corresponding to a plurality of sub-frequency bands according to the frequency bands; the frequency range formed by the plurality of sub-frequency bands is a frequency range corresponding to a preset frequency band. The preset frequency band in this embodiment is a frequency band with a wide frequency range, for example, a frequency band commonly used for 5G communication is 100MHz or 400MHz. It should be noted that when the preset frequency band is divided into a plurality of sub-frequency bands, in general, the more the sub-frequency bands are divided, the smaller the amplitude difference of the signals in each sub-frequency band is, the higher the final test accuracy is, but too many frequency bands may cause the control processor (FPGA or DSP) resource in the tester 102 to be occupied too much, so in this embodiment, the phase difference of the expected test signals in any two sub-frequency bands is smaller than the preset phase value, in an embodiment, the preset phase value may be 10 °, as shown in fig. 6, and for the preset frequency band of 100MHz, the number of the divided sub-frequency bands is 10 (B1, B2, …, B10), which can be understood by those skilled in the art to adjust the preset phase value according to the practical application requirement.
In addition, the expected test signal with the preset frequency band acquired by the tester 102 is a time domain signal, and in this embodiment, the expected test signal with the preset frequency band needs to be converted from the time domain to the frequency domain, and in the frequency domain, the expected test signal with the preset frequency band is divided into expected test signals corresponding to a plurality of sub-frequency bands according to the frequency bands. As an example, a discrete fourier transform may be employed to convert a desired test signal having a preset frequency band from the time domain to the frequency domain.
In one embodiment, taking the wireless communication link between the tester 102 and the receiver port of the wireless device 200 as an example, the specific operation is as follows:
(2-1) acquiring the desired test signal x with the preset frequency band required for the wireless communication link between the kth transmitting port 103 of the tester 102 to the v-th receiver port 202 of the wireless device 200 v,k (p); where k is the index number of the transmit port 103 of the tester 102 and v is the index number of the receiver port 202 of the wireless device 200.
(2-2) desired test signal x with preset frequency band required for a wireless communication link between kth transmit port 103 to the v receiver port 202 of wireless device 200 v,k (p) converting from the time domain to the frequency domain to obtain a desired test signal X in the frequency domain having a preset frequency band for the wireless communication link between the kth transmit port 103 and the v receiver port 202 of the wireless device 200 v,k (w). As an example, the expected test signal x to have the preset frequency band is performed according to the following expression v,k (p) converting from the time domain to the frequency domain:
where P is the length of the discrete fourier transform, and the value may be 128, 256, 512, or 1024.
(2-3) desired test Signal X in the frequency Domain v,k (w) dividing the desired test signal into a plurality of sub-frequency bands to obtain a desired test signal X corresponding to the plurality of sub-frequency bands in the frequency domain i,vk (w)。
And (III) the tester 102 loads the inverse matrix of the space transmission matrix corresponding to each sub-band into the expected test signals corresponding to the corresponding sub-band to obtain the emission test signals corresponding to each sub-band, so as to establish a virtual cable connection between the wireless device 200 and the test antenna 101, and perform an air radiation test on the wireless device 200. The tester 102 performs over-the-air radiation testing on the wireless device 200 including at least one of: controlling the test antenna 101 to transmit a transmission test signal of a preset frequency band to the wireless device 200 to obtain wireless reception performance of the wireless device 200; or, the wireless device 200 is controlled to transmit a transmission test signal of a preset frequency band to the test antenna 101 to obtain wireless transmission performance of the wireless device 200.
In this embodiment, the tester 102 loads the inverse matrix of the spatial transmission matrix corresponding to each sub-band into the expected test signal corresponding to the corresponding sub-band in the frequency domain, so that the transmitted test signal corresponding to each sub-band in the frequency domain is also required to be converted into the time domain. As an example, an inverse discrete fourier transform may be employed to convert the transmitted test signals corresponding to each sub-band in the frequency domain to the time domain.
In one embodiment, taking the wireless communication link between the tester 102 and the receiver port of the wireless device 200 as an example, the specific operation is as follows:
(3-1) inverting transmission parameter vectors (m 'of the wireless communication link between the kth transmitting port 103 of the tester 102 to the v-th receiver port 202 of the wireless device 200 in the inverse matrix of the spatial transmission matrix corresponding to each sub-band' v,k ＝[m 1,vk (f 1 )…m i,vk (f i )…m I,vk (f I )]) Desired test signal X corresponding to multiple sub-bands loaded into frequency domain i,vk (w) obtaining a transmitted test signal X corresponding to each sub-band in the frequency domain of the wireless communication link between the kth transmit port of the tester 102 and the v receiver port 202 of the wireless device 200 i ′ ,vk (w)。
Determining the transmit test signal X corresponding to each sub-band in the frequency domain of the wireless communication link between the kth transmit port 103 of the tester 102 to the v receiver port 202 of the wireless device 200 according to the following expression i ′ ,vk (w)：
X i ′ ,vk (w)＝X i,vk (w)m i,vk (f i )。
(3-2) transmitting the test signals X corresponding to the respective sub-bands in the frequency domain i ′ ,vk (w) converting from the frequency domain to the time domain to obtain the first test meter 102Transmitting test signals x corresponding to respective sub-bands of a wireless communication link between k transmit ports 103 to a v-th receiver port 202 of the wireless device 200 i ′ ,vk (p). As an example, the transmission test signal X corresponding to each sub-band is expressed as follows i ′ ,vk (w) converting from the frequency domain to the time domain:
(3-3) in one embodiment, the k-th transmit port 103 of the tester 102 transmits test signals in each sub-band as follows:
wherein Tx is i,v Indicating that the kth transmit port 103 of the tester 102 is transmitting test signals in the ith sub-band.
According to the embodiment of the invention, the expected test signal with the preset frequency band with wider bandwidth is divided into the expected test signals corresponding to the plurality of sub-frequency bands, and then the inverse matrix of the space transmission matrix corresponding to each sub-frequency band is loaded into the expected test signal corresponding to the corresponding sub-frequency band, so that the aerial radiation test of the wireless equipment is realized, and the problems of low isolation and low test precision when the radiation two-stage (RTS) method is used for executing the test due to higher unevenness of amplitude and phase in the expected test signal with the preset frequency band with wider bandwidth are solved.
Referring to fig. 7, fig. 7 is a flowchart of an air radiation method of a wireless device according to an embodiment, and the air radiation method provided in the embodiment is applied to a tester, and includes steps 10 to 30, which are described in detail below.
Step 10: and acquiring inverse matrixes of the space transmission matrixes corresponding to the plurality of sub-frequency bands between the tester and the wireless equipment.
In one embodiment, in step 10, obtaining an inverse of a spatial transmission matrix between the tester and the wireless device corresponding to a plurality of sub-bands includes: and acquiring a downlink inverse matrix and/or acquiring an uplink inverse matrix. The downlink inverse matrix is an inverse matrix of a space transmission matrix corresponding to a plurality of sub-frequency bands between the tester and a receiver of the wireless device, and the uplink inverse matrix is an inverse matrix of a space transmission matrix corresponding to a plurality of sub-frequency bands between a transmitter of the wireless device and the tester.
In one embodiment, obtaining the downstream inverse matrix includes:
step 11-1: the amplitude variation of each sub-band signal received by each receiver port of the wireless device and transmitted by each transmitting port of the tester is acquired. In this step, signal transceiving needs to be performed multiple times, when each time of signal transceiving is performed, only one transmitting port transmits a signal, and other transmitting ports are closed, and in a single execution, one or more receiver ports of the wireless device can be controlled to receive signals, and all antennas of the wireless device can also be controlled to receive signals simultaneously, so that efficiency is improved. As an embodiment, the acquisition of the amplitude of the received signal by each receiver port of the wireless device may be obtained by a power report of each receiver port of the wireless device, such as RSSI (Reference Signal Strength Indicator, received signal strength indication) or RSRP (Reference Signal Received Power ). In this embodiment, each time the test antenna for transmitting signals is executed, the test antenna for transmitting signals may be controlled to transmit signals of each sub-band one by one, so as to obtain the amplitude variation of the signals of each sub-band transmitted by the transmitting port received by each receiver port.
Step 12-1: the phase difference of each sub-band signal received by each receiver port of the wireless device and transmitted simultaneously by any two transmitting ports of the tester is obtained. The step can obtain the amplitude of the synthesized signal received by each receiver port by controlling any two transmitting ports to transmit signals of each sub-band for a plurality of times with different phase differences, and obtain the phase differences of the signals of each sub-band respectively transmitted by any two transmitting ports received by each receiver port of the wireless device according to the amplitude of the signals of each sub-band respectively transmitted by any two transmitting ports and the amplitude of the synthesized signal received by each receiver port. This step requires multiple signal transceiving operations, where, during each operation, two transmit ports transmit signals and the other transmit port channels are closed, and optionally, during a single operation, one or more receiver ports of the wireless device may be controlled to receive signals, and all receiver ports may be controlled to receive signals simultaneously, so as to improve efficiency. As an example, the phase difference is calculated by: the phase difference is obtained by fourier series fitting or fourier transform calculation according to the amplitude of the signal received by each receiver port of the wireless device and transmitted by any two transmitting ports respectively and the amplitude of the synthesized signal (i.e. the signal transmitted by both transmitting ports together). As another embodiment, the phase difference is calculated by: first, a composite amplitude reference value is calculated from the amplitudes of signals received by each receiver port of the wireless device and transmitted by any two transmit ports, respectively. The synthesized amplitude reference value here is an amplitude calculation value of a synthesized signal obtained when the aforementioned separately transmitted signals are synthesized at each receiver port of the wireless device with different phase differences. Then, the phase difference is calculated according to the calculated synthesized amplitude reference value and the amplitude of the synthesized signal obtained by the test. In this embodiment, when each execution is performed, any two transmitting ports that transmit signals may be controlled to transmit signals of each sub-band one by one, so as to obtain a phase difference of each sub-band signal received by each receiver port of the wireless device and transmitted by any two transmitting ports respectively.
Step 13-1: and acquiring an inverse matrix of a space transmission matrix corresponding to a plurality of sub-frequency bands between the tester and a receiver of the wireless equipment according to the amplitude variation and the phase difference corresponding to each sub-frequency band signal. That is, each sub-band corresponds to an inverse matrix of a spatial transmission matrix, and it should be noted that the construction method of the inverse matrix of the spatial transmission matrix is described in detail in the above embodiment, which is not described herein.
In one embodiment, obtaining the upstream inverse matrix includes:
step 11-2: the amplitude variation of the respective sub-band signals received by each receiving port of the tester and transmitted by each transmitter port 204 of the wireless device is acquired.
Step 12-2: the phase difference of each sub-band signal received by each receiving port of the tester and transmitted simultaneously by any two transmitter ports 204 of the wireless device is obtained.
Step 12-3: and acquiring an inverse matrix of a space transmission matrix corresponding to a plurality of sub-frequency bands between a receiver of the wireless device and the tester according to the amplitude change and the phase difference corresponding to each sub-frequency band signal.
It should be noted that, the working states of the tester and the wireless device may be a transmitting state or a receiving state, the specific manner of obtaining the downlink inverse matrix through the receiving performance test has been described in detail in the foregoing embodiments, and it is known from the principle of transception and transception, and the test results obtained by the transmitting performance test and the receiving performance test should be consistent, so the embodiment will not be repeated with a specific manner of obtaining the uplink inverse matrix through the transmitting performance test.
Step 20: acquiring expected test signals with preset frequency bands, and dividing the expected test signals with the preset frequency bands into expected test signals corresponding to a plurality of sub-frequency bands according to the frequency bands; the frequency range formed by the plurality of sub-frequency bands is a frequency range corresponding to a preset frequency band. In this embodiment, the number of sub-bands divided by the preset frequency band is theoretically larger, when the number of sub-bands is larger, the phase change of the signal in each sub-band will be very tiny, however, too many sub-bands occupy more resources for the control processor in the tester, so that a proper sub-band data needs to be selected, in this embodiment, the expected test signals corresponding to the sub-bands need to satisfy: the phase difference of the expected test signal corresponding to any two sub-bands is smaller than a preset phase value, which in this embodiment takes a value of 10 °. It should be noted that, in the present embodiment, the expected test signal with the preset frequency band is divided into the expected test signals corresponding to the plurality of sub-frequency bands according to the frequency band, so that the expected test signal with the preset frequency band needs to be converted from the time domain to the frequency domain and then divided into the expected test signals corresponding to the plurality of sub-frequency bands.
Step 30: and loading the inverse matrix of the space transmission matrix corresponding to each sub-band into expected test signals corresponding to the corresponding sub-bands to obtain emission test signals corresponding to each sub-band, so as to establish virtual cable connection between the tester and the wireless equipment, and executing air radiation test on the wireless equipment. The tester performs an over-the-air radiation test on the wireless device including at least one of: controlling a test antenna to transmit a transmission test signal of a preset frequency band to wireless equipment so as to obtain wireless receiving performance of the wireless equipment; or controlling the wireless device to transmit a transmission test signal with a preset frequency band to the test antenna so as to obtain the wireless transmission performance of the wireless device. In this embodiment, the tester loads the inverse matrix of the spatial transmission matrix corresponding to each sub-band into the expected test signal corresponding to the corresponding sub-band in the frequency domain, so that the transmitted test signal corresponding to each sub-band in the frequency domain is also required to be converted into the time domain. As an example, an inverse discrete fourier transform may be employed to convert the transmitted test signals corresponding to each sub-band in the frequency domain to the time domain.
Referring to fig. 8, the embodiment of the present invention further provides a tester, which includes an inverse matrix obtaining module 1001, a subband obtaining module 1002, and an inverse matrix loading module 1003.
The inverse matrix obtaining module 1001 is configured to obtain an inverse matrix of a spatial transmission matrix corresponding to a plurality of sub-bands between the tester and the wireless device.
The sub-band obtaining module 1002 is configured to obtain a desired test signal having a preset frequency band, and divide the desired test signal having the preset frequency band into desired test signals corresponding to a plurality of sub-bands according to the frequency band; the frequency range formed by the plurality of sub-frequency bands is a frequency range corresponding to the preset frequency band.
The inverse matrix loading module 1003 is configured to load an inverse matrix of a spatial transmission matrix corresponding to each sub-band into an expected test signal corresponding to the corresponding sub-band, so as to obtain an emission test signal corresponding to each sub-band, so as to establish a virtual cable connection between the tester and the wireless device, and perform an air radiation test on the wireless device.
The modules in the tester provided in this embodiment correspond to the method steps in the foregoing embodiments, and specific implementation manners of the modules in the foregoing embodiments are described in detail in the foregoing embodiments, which are not repeated herein.
Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by a computer program. When all or part of the functions in the above embodiments are implemented by means of a computer program, the program may be stored in a computer readable storage medium, and the storage medium may include: read-only memory, random access memory, magnetic disk, optical disk, hard disk, etc., and the program is executed by a computer to realize the above-mentioned functions. For example, the program is stored in the memory of the device, and when the program in the memory is executed by the processor, all or part of the functions described above can be realized. In addition, when all or part of the functions in the above embodiments are implemented by means of 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 disk, or a removable hard disk, and the program in the above embodiments may be implemented by downloading or copying the program into a memory of a local device or updating a version of a system of the local device, and when the program in the memory is executed by a processor.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.
Claims (15)
1. An airborne radiation testing system for a wireless device, the airborne radiation testing system comprising a tester and at least two test antennas, wherein:
the test antenna is used for establishing a wireless communication link between the tester and the wireless device so as to enable the tester to wirelessly communicate with the wireless device;
the tester is configured to:
acquiring an inverse matrix of a space transmission matrix corresponding to a plurality of sub-frequency bands between the tester and the wireless equipment;
acquiring an expected test signal with a preset frequency band, and dividing the expected test signal with the preset frequency band into expected test signals corresponding to a plurality of sub-frequency bands according to the frequency band; the frequency range formed by the plurality of sub-frequency bands is a frequency range corresponding to the preset frequency band;
and loading the inverse matrix of the space transmission matrix corresponding to each sub-band into expected test signals corresponding to the corresponding sub-band to obtain emission test signals corresponding to each sub-band, so as to establish virtual cable connection between the tester and the wireless equipment, and executing air radiation test on the wireless equipment.
2. The over-the-air radiation testing system of claim 1, wherein the obtaining an inverse of a spatial transmission matrix between the tester and the wireless device corresponding at a plurality of sub-bands comprises: and acquiring a downlink inverse matrix and/or acquiring an uplink inverse matrix.
3. The over-the-air radiation testing system of claim 2, wherein said obtaining a downstream inverse matrix comprises:
acquiring amplitude changes of the sub-band signals respectively transmitted by each transmitting port of the tester, which are received by each receiver port of the wireless equipment;
acquiring phase differences of the signals of the sub-frequency bands which are received by each receiver port of the wireless equipment and simultaneously transmitted by any two transmitting ports of the tester;
and acquiring an inverse matrix of a space transmission matrix corresponding to a plurality of sub-frequency bands between the tester and a receiver of the wireless equipment according to the amplitude variation and the phase difference corresponding to each sub-frequency band signal.
4. The aerial radiation test system of claim 2, wherein the obtaining an upstream inverse matrix comprises:
acquiring amplitude changes of the sub-band signals received by each receiving port of the tester and respectively transmitted by each transmitter port of the wireless equipment;
Acquiring phase differences of the signals of the sub-frequency bands which are received by each receiving port of the tester and simultaneously transmitted by any two transmitter ports of the wireless equipment;
and acquiring an inverse matrix of a space transmission matrix corresponding to a plurality of sub-frequency bands between a transmitter of the wireless device and the tester according to the amplitude variation and the phase difference corresponding to each sub-frequency band signal.
5. The air radiation test system of claim 1, wherein dividing the desired test signal having the predetermined frequency band into desired test signals corresponding to a plurality of sub-bands according to the frequency band comprises:
and converting the expected test signal with the preset frequency band from a time domain to a frequency domain, and dividing the expected test signal with the preset frequency band into expected test signals corresponding to a plurality of sub-frequency bands according to the frequency band in the frequency domain.
6. The air radiation test system of claim 5, wherein the desired test signals corresponding to the plurality of sub-bands satisfy the following condition:
the phase difference of the expected test signals corresponding to any two sub-frequency bands is smaller than a preset phase value.
7. The air radiation test system of claim 5, wherein loading the inverse of the spatial transmission matrix corresponding to each sub-band into the desired test signal corresponding to the corresponding sub-band to obtain the transmitted test signal corresponding to each sub-band comprises:
Loading the inverse matrix of the space transmission matrix corresponding to each sub-frequency band into the expected test signal corresponding to the corresponding sub-frequency band to obtain the emission test signal corresponding to each sub-frequency band in the frequency domain;
and converting the emission test signals corresponding to the frequency sub-bands in the frequency domain from the frequency domain to the time domain to obtain the emission test signals corresponding to the frequency sub-bands.
8. A method for testing over-the-air radiation of a wireless device, the method comprising:
acquiring inverse matrixes of space transmission matrixes corresponding to a plurality of sub-frequency bands between the tester and the wireless equipment;
acquiring an expected test signal with a preset frequency band, and dividing the expected test signal with the preset frequency band into expected test signals corresponding to a plurality of sub-frequency bands according to the frequency band; the frequency range formed by the plurality of sub-frequency bands is a frequency range corresponding to the preset frequency band;
and loading the inverse matrix of the space transmission matrix corresponding to each sub-band into expected test signals corresponding to the corresponding sub-band to obtain emission test signals corresponding to each sub-band, so as to establish virtual cable connection between the tester and the wireless equipment, and executing air radiation test on the wireless equipment.
9. The method of claim 8, wherein obtaining an inverse of a spatial transmission matrix between the tester and the wireless device corresponding to a plurality of sub-bands comprises: and acquiring a downlink inverse matrix and/or acquiring an uplink inverse matrix.
10. The method of air radiation testing as defined in claim 9, wherein said obtaining a downstream inverse matrix comprises:
acquiring amplitude changes of the sub-band signals respectively transmitted by each transmitting port of the tester, which are received by each receiver port of the wireless equipment;
acquiring phase differences of the signals of the sub-frequency bands which are received by each receiver port of the wireless equipment and simultaneously transmitted by any two transmitting ports of the tester;
and acquiring an inverse matrix of a space transmission matrix corresponding to a plurality of sub-frequency bands between the tester and a receiver of the wireless equipment according to the amplitude variation and the phase difference corresponding to each sub-frequency band signal.
11. The method of air radiation testing as defined in claim 9, wherein said obtaining an upstream inverse matrix comprises:
acquiring amplitude changes of the sub-band signals received by each receiving port of the tester and respectively transmitted by each transmitter port of the wireless equipment;
Acquiring phase differences of the signals of the sub-frequency bands which are received by each receiving port of the tester and simultaneously transmitted by any two transmitter ports of the wireless equipment;
and acquiring an inverse matrix of a space transmission matrix corresponding to a plurality of sub-frequency bands between a transmitter of the wireless device and the tester according to the amplitude variation and the phase difference corresponding to each sub-frequency band signal.
12. The method of air radiation testing as defined in claim 8, wherein dividing the desired test signal having the preset frequency band into desired test signals corresponding to a plurality of sub-frequency bands according to the frequency band comprises:
and converting the expected test signal with the preset frequency band from a time domain to a frequency domain, and dividing the expected test signal with the preset frequency band into expected test signals corresponding to a plurality of sub-frequency bands according to the frequency band in the frequency domain.
13. The method of air radiation testing as defined in claim 12, wherein loading the inverse matrix of the spatial transmission matrix corresponding to each sub-band into the expected test signal corresponding to the corresponding sub-band to obtain the emission test signal corresponding to each sub-band comprises:
loading the inverse matrix of the space transmission matrix corresponding to each sub-frequency band into the expected test signal corresponding to the corresponding sub-frequency band to obtain the emission test signal corresponding to each sub-frequency band in the frequency domain;
And converting the emission test signals corresponding to the frequency sub-bands in the frequency domain from the frequency domain to the time domain to obtain the emission test signals corresponding to the frequency sub-bands.
14. A tester, comprising:
the inverse matrix acquisition module is used for acquiring inverse matrixes of the space transmission matrixes corresponding to the plurality of sub-frequency bands between the tester and the wireless equipment;
the sub-frequency band acquisition module is used for acquiring expected test signals with preset frequency bands, and dividing the expected test signals with the preset frequency bands into expected test signals corresponding to a plurality of sub-frequency bands according to the frequency bands; the frequency range formed by the plurality of sub-frequency bands is a frequency range corresponding to the preset frequency band;
and the inverse matrix loading module is used for loading the inverse matrix of the space transmission matrix corresponding to each sub-frequency band into expected test signals corresponding to the corresponding sub-frequency band to obtain emission test signals corresponding to each sub-frequency band so as to establish virtual cable connection between the tester and the wireless equipment and execute air radiation test on the wireless equipment.
15. A computer readable storage medium having stored thereon a program executable by a processor to implement the method of aerial radiation testing of any of claims 8-13.
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| CN202211689588.7A CN116112101A (en) | 2022-12-27 | 2022-12-27 | Air radiation test system, method and tester for wireless equipment |
| PCT/CN2023/135548 WO2024139997A1 (en) | 2022-12-27 | 2023-11-30 | Wireless device air radiation testing system and method, and testing device |
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| CN202211689588.7A CN116112101A (en) | 2022-12-27 | 2022-12-27 | Air radiation test system, method and tester for wireless equipment |
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| WO2024139997A1 (en) * | 2022-12-27 | 2024-07-04 | 深圳市通用测试系统有限公司 | Wireless device air radiation testing system and method, and testing device |
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| US11451275B2 (en) * | 2004-04-02 | 2022-09-20 | Rearden, Llc | System and method for distributed antenna wireless communications |
| EP2916506B1 (en) * | 2014-03-07 | 2019-07-31 | Vodafone GmbH | Walsh-Hadamard transformed GFDM radio transmission |
| CN110166177A (en) * | 2019-05-28 | 2019-08-23 | 山东创惠电子科技有限责任公司 | A kind of information transmission system design method based on low peak average ratio |
| CN116112101A (en) * | 2022-12-27 | 2023-05-12 | 深圳市通用测试系统有限公司 | Air radiation test system, method and tester for wireless equipment |
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| WO2024139997A1 (en) * | 2022-12-27 | 2024-07-04 | 深圳市通用测试系统有限公司 | Wireless device air radiation testing system and method, and testing device |
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