CN115694568A - System and method for performing over-the-air radiation testing on wireless devices - Google Patents
System and method for performing over-the-air radiation testing on wireless devices Download PDFInfo
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Abstract
The present disclosure provides systems and methods for performing over-the-air radiation testing on wireless devices, wherein the systems include: at least first and second test antennas for wireless communication with the DUT; a tester to obtain a spatial propagation channel matrix between an antenna port of a DUT and a test antenna by performing the following operations: obtaining amplitude variation, namely obtaining the amplitude variation of signals which are received by each antenna port of a DUT and respectively transmitted by each test antenna; acquiring phase difference, namely acquiring the phase difference of signals received by each antenna port of a DUT and respectively transmitted by any two test antennas; and acquiring a matrix, namely acquiring a space propagation channel matrix according to the amplitude change and the phase difference. The tester is also used to load the inverse of the spatial propagation channel matrix on the test signal to establish a virtual cable connection between the antenna port of the DUT and the test antenna to perform over-the-air radiation testing.
Description
Technical Field
The present invention relates to the field of communication testing, and more particularly, to a system, method, device, and storage medium for performing over-the-air radiation testing on wireless devices.
Background
Modern wireless technologies adopt MIMO (multi-input multi-output) technology to increase data transmission speed. The MIMO technology can improve the reliability of wireless transmission and improve the spectrum efficiency of a wireless communication system, and is a key technology for the future. With the continuous development and application of MIMO technology, complete and mature test requirements and test methods for evaluating the radiation throughput of MIMO devices are required.
The MIMO OTA is a multi-antenna complete machine performance test method, which simulates a target channel environment in a laboratory environment and places an MIMO terminal in the environment to observe the throughput performance. In the related art, the method for testing the MIMO OTA mainly comprises the following steps: multi-Probe Anechoic Chamber (MPAC), reverberation Chamber (RC), and radial Two-stage Method (RTS).
The radiation two-step method integrates an antenna directional diagram of the tested device and a wireless channel model required by the test through a mathematical operation method, and in a free space simulated by an anechoic chamber, a test signal is radiated to the tested device through a test antenna through a virtual wire technology to realize the test. Specifically, one of the processing modes for the test signal includes: loading an antenna directional diagram of the tested equipment into a channel simulator, simulating a wireless channel containing the antenna characteristics of the tested equipment, and carrying out convolution on a signal output by a base station simulator and the wireless channel to generate a throughput test signal; determining a spatial propagation channel matrix (propagation channel matrix) between a test antenna and a device to be tested in an anechoic chamber, loading an inverse matrix of the spatial propagation channel matrix on a throughput test signal, and transmitting the processed signal to the device to be tested through the test antenna to perform throughput test.
Disclosure of Invention
The present disclosure describes a system and method for performing over-the-air radiation testing on wireless devices.
According to a first aspect of embodiments of the present disclosure there is provided a system for performing over the air radiation testing of a wireless device, the wireless device being a DUT having at least first and second antenna ports, the system comprising:
at least first and second test antennas for wireless communication with the DUT;
a tester to obtain a spatial propagation channel matrix between an antenna port of a DUT and a test antenna by performing the following operations:
acquiring amplitude variation, namely controlling each test antenna to respectively transmit signals, acquiring the amplitude of the signals received by each antenna port of the DUT, and accordingly acquiring the amplitude variation of the signals received by each antenna port of the DUT and respectively transmitted by each test antenna;
phase difference acquisition, namely controlling any two test antennas to transmit signals for multiple times with different phase differences, acquiring the amplitude of a synthesized signal received by each antenna port of a DUT, and acquiring the phase difference of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas according to the amplitude of the signals received by each antenna port of the DUT and the amplitude of the synthesized signal;
acquiring a matrix, namely acquiring a space propagation channel matrix between an antenna port of a DUT and a test antenna according to the amplitude change and the phase difference;
the tester is also configured to load an inverse of the spatial propagation channel matrix on the test signal to establish a virtual cable connection between the antenna port of the DUT and the test antenna to perform over-the-air radiation testing on the DUT.
According to an embodiment of the system, in performing the phase difference obtaining operation, obtaining the phase difference of the signals respectively transmitted by any two test antennas and received by each antenna port of the DUT according to the amplitude of the signal respectively transmitted by any two test antennas and the amplitude of the synthesized signal and received by each antenna port of the DUT includes: and according to the amplitude of the signal respectively transmitted by any two test antennas and the amplitude of the synthesized signal received by each antenna port of the DUT, calculating the phase difference of the signal respectively transmitted by any two test antennas and received by each antenna port of the DUT through Fourier series fitting or Fourier transform.
According to an embodiment of the system, the obtaining, by the tester in performing the phase difference obtaining operation, the phase difference of the signals respectively transmitted by any two test antennas and received by each antenna port of the DUT according to the amplitude of the signal respectively transmitted by any two test antennas and the amplitude of the synthesized signal received by each antenna port of the DUT includes: calculating a synthesized amplitude reference value according to the amplitude of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas, wherein the synthesized amplitude reference value is the amplitude calculation value of the synthesized signal obtained when the respectively transmitted signals are synthesized at each antenna port of the DUT with different phase differences; and calculating the phase difference of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas according to the synthesized amplitude reference value and the amplitude of the synthesized signal.
According to one embodiment of the system, the tester obtains the amplitude of the signal received by each antenna port of the DUT by reading a power report for each antenna port of the DUT in performing the amplitude variation acquisition operation and the phase difference acquisition operation.
According to one embodiment of the system, the system further comprises an anechoic chamber for housing at least the DUT and the test antenna.
According to one embodiment of the system, the tester performing over-the-air radiation testing on the DUT includes at least one of: loading an inverse matrix of a space propagation channel matrix on a test signal to obtain a signal to be transmitted, and controlling a test antenna to transmit the signal to be transmitted to a DUT (device under test) so as to obtain the wireless receiving performance of the DUT; or loading an inverse matrix of a space propagation channel matrix on the test signal to obtain a signal to be transmitted, and controlling the DUT to transmit the signal to be transmitted to the test antenna to obtain the wireless transmission performance of the DUT; or controlling the DUT to transmit a test signal to the test antenna, and loading an inverse matrix of the spatial propagation channel matrix on the signal received by the test antenna to obtain the wireless transmission performance of the DUT.
According to a second aspect of embodiments of the present disclosure there is provided a method of performing over the air radiation testing of a wireless device, the wireless device being a DUT having at least first and second antenna ports, the method using at least first and second test antennas, the method comprising:
an amplitude variation obtaining step, namely controlling each test antenna to respectively transmit signals, obtaining the amplitude of the signals received by each antenna port of the DUT, and accordingly obtaining the amplitude variation of the signals received by each antenna port of the DUT and respectively transmitted by each test antenna;
a phase difference obtaining step of controlling any two test antennas to transmit signals for multiple times with different phase differences, obtaining the amplitude of a synthesized signal received by each antenna port of the DUT, and obtaining the phase difference of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas according to the amplitude of the signals received by each antenna port of the DUT and the amplitude of the synthesized signal;
a matrix obtaining step, namely obtaining a space propagation channel matrix between an antenna port of the DUT and a test antenna according to the amplitude variation and the phase difference;
and a testing step, namely loading an inverse matrix of the space propagation channel matrix on the testing signal so as to establish a virtual cable connection between the antenna port of the DUT and the testing antenna, and executing the aerial radiation test on the DUT.
According to an embodiment of the method, in the phase difference obtaining step, obtaining the phase difference of the signals respectively transmitted by any two test antennas and received by each antenna port of the DUT according to the amplitude of the signal respectively transmitted by any two test antennas and the amplitude of the synthesized signal received by each antenna port of the DUT includes: and according to the amplitude of the signal received by each antenna port of the DUT and respectively transmitted by any two test antennas and the amplitude of the synthesized signal, calculating the phase difference of the signal received by each antenna port of the DUT and respectively transmitted by any two test antennas through Fourier series fitting or Fourier transform.
According to an embodiment of the method, in the phase difference obtaining step, obtaining the phase difference of the signals respectively transmitted by any two test antennas and received by each antenna port of the DUT according to the amplitude of the signal respectively transmitted by any two test antennas and the amplitude of the synthesized signal and received by each antenna port of the DUT includes: calculating a synthesized amplitude reference value according to the amplitude of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas, wherein the synthesized amplitude reference value is the amplitude calculation value of the synthesized signal obtained when the respectively transmitted signals are synthesized at each antenna port of the DUT with different phase differences; and calculating the phase difference of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas according to the synthesized amplitude reference value and the amplitude of the synthesized signal.
According to one embodiment of the method, the amplitude of the signal received by each antenna port of the DUT is obtained by reading a power report of each antenna port of the DUT in the amplitude variation obtaining step and the phase difference obtaining step.
According to one embodiment of the method, the testing step comprises at least one of: loading an inverse matrix of a space propagation channel matrix on a test signal to obtain a signal to be transmitted, and controlling a test antenna to transmit the signal to be transmitted to a DUT (device under test) so as to obtain the wireless receiving performance of the DUT; or loading an inverse matrix of a space propagation channel matrix on the test signal to obtain a signal to be transmitted, and controlling the DUT to transmit the signal to be transmitted to the test antenna to obtain the wireless transmission performance of the DUT; or controlling the DUT to transmit a test signal to the test antenna, and loading an inverse matrix of the spatial propagation channel matrix on the signal received by the test antenna to obtain the wireless transmission performance of the DUT.
According to a third aspect of embodiments of the present disclosure, there is provided an electronic device comprising a processor; a memory for storing a computer program executable by the processor; wherein a processor, when executing the computer program, implements the method as described above.
According to a fourth aspect of embodiments of the present disclosure, there is provided a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method as described above.
Drawings
Fig. 1 is a schematic diagram illustrating a system for performing over the air radiation testing of a wireless device according to one embodiment of the present disclosure.
FIG. 2a is a schematic diagram illustrating a test antenna 301 transmitting signals and 2 antenna ports of a DUT receiving signals according to one embodiment of the present disclosure.
FIG. 2b is a schematic diagram illustrating the test antenna 302 transmitting signals and the 2 antenna ports of the DUT receiving signals according to one embodiment of the present disclosure.
FIG. 2c is a schematic diagram illustrating 2 test antennas transmitting signals and 2 antenna ports of a DUT receiving signals according to one embodiment of the present disclosure.
Fig. 3 is a schematic diagram illustrating a method of performing over the air radiation testing on a wireless device according to one embodiment of the present disclosure.
FIG. 4a is a schematic diagram illustrating a test antenna 301 transmitting signals and 4 antenna ports of a DUT receiving signals according to one embodiment of the present disclosure.
FIG. 4b is a schematic diagram illustrating the test antenna 302 transmitting signals and the 4 antenna ports of the DUT receiving signals according to one embodiment of the present disclosure.
FIG. 4c is a schematic diagram illustrating the test antenna 303 transmitting signals and the 4 antenna ports of the DUT receiving signals according to one embodiment of the present disclosure.
FIG. 4d is a schematic diagram illustrating the test antenna 304 transmitting signals and the 4 antenna ports of the DUT receiving signals according to one embodiment of the present disclosure.
FIG. 4e is a schematic diagram illustrating the test antenna 301 and the test antenna 302 transmitting signals and the 4 antenna ports of the DUT receiving signals according to one embodiment of the present disclosure.
FIG. 5 is a schematic diagram of an electronic device shown in the present disclosure according to one embodiment.
Detailed Description
Embodiments of the present disclosure are described below with reference to the drawings. It should be understood that the drawings are not necessarily to scale. The described embodiments are exemplary and not intended to limit the disclosure, which features may be combined with or substituted for those of the embodiments in the same or similar manner. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
One of the key technologies of the radiation two-step method is to connect a "virtual wire" between a test antenna and a device under test, so that a test signal propagates to the device under test through the "virtual wire" in a free space simulated by an anechoic chamber, so as to avoid intrusive interference on the device under test caused by using a physical wire to transmit the signal. The implementation of the "virtual wire" relies on the determination of the spatial propagation channel matrix between the test antenna and the device under test in the anechoic chamber. In the related art, a general matrix of the spatial propagation channel matrix is expressed as follows:
wherein p is xy Representing the amplitude variation of the signal sent by the y test antenna to the x antenna of the tested piece,
indicating the phase change of the signal transmitted by the y-th MIMO test antenna and received by the x-th antenna, also can be said
Is the S parameter sent by the y-th test antenna to the x-th antenna for reception, x =1,2,3, \ 8230, N, y =1,2,3, \ 8230, N.
The test system, method, device and storage medium of embodiments of the present disclosure are described below with reference to the accompanying drawings, in which improvements to how the spatial propagation channel matrix is determined are included.
An embodiment of an aspect of the present disclosure provides a system for performing over the air radiation testing on a wireless device, the wireless device being a DUT having at least two antenna ports, the system comprising at least two test antennas for wireless communication with the DUT, the system further comprising a tester connected to the test antennas and the DUT by a cable connection or a wireless connection, the tester configured to obtain a spatial propagation channel matrix between the antenna ports of the DUT and the test antennas by:
and amplitude change obtaining operation, wherein the tester controls each test antenna to respectively transmit signals, obtains the amplitude of the signals received by each antenna port of the DUT, and accordingly obtains the amplitude change of the signals received by each antenna port of the DUT and respectively transmitted by each test antenna. The amplitude variation acquiring operation is explained here. Signal receiving and transmitting in the operation need to be executed for multiple times, only one test antenna transmits a signal and other test antenna channels are closed in each execution, optionally, in a single execution, one or more antenna ports of the DUT can be controlled to receive the signal, and all the antenna ports can also be controlled to receive the signal at the same time, so as to improve efficiency. As an example, the obtaining of the amplitude of the Signal Received by each antenna port of the DUT may be obtained by reading, by the tester, a Power report of each antenna port of the DUT, where the Power report is, for example, RSSI (Received Signal Strength Indicator) or RSRP (Reference Signal Received Power), and the tester converts the read Power report into a real number to obtain the amplitude value of the Signal;
and a phase difference obtaining operation, wherein the tester controls any two test antennas to transmit signals for multiple times with different phase differences, obtains the amplitude of a synthesized signal received by each antenna port of the DUT, and obtains the phase difference of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas according to the amplitude of the signals received by each antenna port of the DUT and the amplitude of the synthesized signal. The phase difference acquisition operation is explained here. The signal receiving and sending in the operation needs to be executed for multiple times, when the signal receiving and sending are executed each time, two test antennas transmit signals, and other test antenna channels are closed. As an example, the phase difference is calculated as follows: the phase difference is calculated by fourier series fitting or fourier transform according to the amplitude of the signal respectively transmitted by any two test antennas and the amplitude of the composite signal (i.e., the signal transmitted by the two test antennas in common) received by each antenna port of the DUT. As another example, the phase difference is calculated as: first, a composite amplitude reference value is calculated from the amplitudes of the signals received by each antenna port of the DUT and transmitted by any two test antennas, respectively. The synthesized amplitude reference value here is an amplitude calculation value of the synthesized signal obtained when the aforementioned separately transmitted signals are synthesized at each antenna port of the DUT 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.
And performing matrix acquisition operation, wherein the tester acquires a space propagation channel matrix between an antenna port of the DUT and the test antenna according to the acquired amplitude variation and phase difference.
The tester is also configured to load the test signal with an inverse of the spatial propagation channel matrix to establish a virtual cable connection between the antenna port of the DUT and the test antenna to perform an over-the-air radiation test on the DUT. Optionally, the tester performing an aerial radiation test on the DUT includes at least one of: loading an inverse matrix of a space propagation channel matrix on a test signal to obtain a signal to be transmitted, and controlling a test antenna to transmit the signal to be transmitted to a DUT (device under test) so as to obtain the wireless receiving performance of the DUT; or, loading the inverse matrix of the space propagation channel matrix to the test signal to obtain a signal to be transmitted, and controlling the DUT to transmit the signal to be transmitted to the test antenna to obtain the wireless transmission performance of the DUT; or, controlling the DUT to transmit a test signal to the test antenna, and loading an inverse matrix of the spatial propagation channel matrix on the signal received by the test antenna to obtain the wireless transmission performance of the DUT.
Embodiments of the present disclosure can efficiently and conveniently obtain a spatial propagation channel matrix between a test antenna and an antenna port of a DUT to perform OTA testing on the DUT by a radiating two-step process.
Optionally, the test system further comprises an anechoic chamber for housing at least the DUT and the test antenna, providing an electromagnetic environment for testing.
FIG. 1 illustrates one embodiment of a test system. The present embodiment is a 2 × 2MIMO test system. Referring to fig. 1, a test system 100 includes: a first test antenna 301 and a second test antenna 302; a tester 400, the tester 400 being connected to the first test antenna 301 and the second test antenna 302 and being capable of wireless communication with a DUT200, the DUT200 having a first antenna port 201 and a second antenna port 202; anechoic chamber 500 for providing an electromagnetic environment for testing. In fig. 1, the test apparatus 400 is placed inside the anechoic chamber 500, but in another embodiment, the test apparatus 400 may be placed outside the anechoic chamber 500.
The operations (including the amplitude variation acquisition operation, the phase difference acquisition operation, and the matrix acquisition operation) performed by the tester to obtain the spatial propagation channel matrix between the antenna ports of the DUT and the test antennas are exemplified below with a 2 × 2MIMO test as an example. In order to facilitate data processing, in the first and second performing operations described below, the signal transmitted by the test antenna is a signal subjected to normalization processing.
In the amplitude variation acquisition operation, the tester performs the following operations:
operation 11, as shown in fig. 2a, controls the test antenna 301 to transmit a signal, controls the test antenna 302 not to transmit a signal, and controls the tester to read the power report of the antenna port 201 of the DUT, thereby obtaining the amplitude p of the signal received by the antenna port 201 11 The tester reads the power report of the antenna port 202 of the DUT, and from this obtains the amplitude p of the signal received by the antenna port 202 21 . Since the test antenna 301 emits the normalized signal, the amplitude p is directly measured 11 Determining the amplitude p as the amplitude variation of the signal received by the antenna port 201 and transmitted by the test antenna 301 21 The amplitude variation of the signal transmitted by the test antenna 301 received by the antenna port 202 is determined.
In operation 12, as shown in fig. 2b, the test antenna 302 is controlled to transmit a signal, the test antenna 301 does not transmit a signal, and similarly to operation 11, the tester obtains the amplitude p of the signal received by the antenna port 201 by reading the power report 12 And the amplitude p of the signal received by the antenna port 202 22 . Will have an amplitude p 12 Determined as received by the antenna port 201 by the test antenna302, the amplitude of the transmitted signal varies, the amplitude p 22 Determined as the amplitude variation of the signal received by the antenna port 202 and transmitted by the test antenna 302.
In the phase difference acquisition operation, as shown in fig. 2c, the tester performs the following operations:
operation 21, controlling the test antenna 301 and the test antenna 302 to transmit signals with a phase difference of 0 °, reading power reports by the tester, and obtaining the amplitude p of the composite signal received by the antenna port 201 1-12-0 And the amplitude p of the composite signal received at the antenna port 202 2-12-0 。
Operation 22, control the test antenna 301 and the test antenna 302 to transmit signals with a phase difference of 60 °, and the tester reads the power report to obtain the amplitude p of the composite signal received by the antenna port 201 1-12-60 And the amplitude p of the composite signal received at the antenna port 202 2-12-60 。
Operation 23, control the test antenna 301 and the test antenna 302 to transmit signals with a phase difference of 120 °, and the tester reads the power report to obtain the amplitude p of the composite signal received by the antenna port 201 1-12-120 And the amplitude p of the composite signal received at the antenna port 202 2-12-120 。
Operation 24, control the test antenna 301 and the test antenna 302 to transmit signals with a phase difference of 180 °, and the tester reads the power report to obtain the amplitude p of the composite signal received by the antenna port 201 1-12-180 And the amplitude p of the composite signal received at the antenna port 202 2-12-180 。
Operation 25, the test antenna 301 and the test antenna 302 are controlled to jointly transmit the signal with the phase difference of 240 °, and the tester obtains the amplitude p of the composite signal received by the antenna port 201 by reading the power report 1-12-240 And the amplitude p of the composite signal received at the antenna port 202 2-12-240 。
Operation 26, according to operation 11, the amplitude p of the signal transmitted by the test antenna 301 received by the antenna port 201 11 And, in operation 12, the amplitude p of the signal transmitted by the test antenna 302 received by the antenna port 201 12 And operations 21 to 25, daysAmplitude p of the combined signal received by the line port 201 and transmitted by the test antenna 301 and the test antenna 302 1-12-0 ，p 1-12-60 ，p 1-12-120 ，p 1-12-180 ，p 1-12-240 The phase difference between the signals respectively transmitted by the test antenna 301 and the test antenna 302 received by the antenna port 201 is obtained by fourier series fitting or fourier change calculation, and recorded as
I.e. the difference/relative value of the phase change of the signal from the test antenna 301 to the antenna port 201 and the phase change of the signal from the test antenna 302 to the antenna port 201. As an example, the calculating includes: setting a parameter x = {0,60,120,180,240} according to a phase difference of signals transmitted from the test antenna 301 and the test antenna 302 in operations 21 to 25, and setting a parameter y = { p } according to an amplitude of a composite signal received by the antenna port 201 in operations 21 to 25 1-12-0 ,p 1-12-60 ,p 1-12-120 ,p 1-12-180 ,p 1-12-240 With y as a dependent variable and x as an independent variable, a function y = a cos (w (x + C)) is obtained by a first order fourier transform, where C is the phase difference of the signals received by the antenna port 201 and transmitted by the test antenna 301 and the test antenna 302, respectively.
Operation 27, similar to operation 26, according to operation 11, the amplitude p of the signal transmitted by the test antenna 301 received by the antenna port 202 21 And, in operation 12, the amplitude p of the signal transmitted by the test antenna 302 received by the antenna port 202 22 And in operations 21-25, the amplitude p of the combined signal received by the antenna port 202 and transmitted by the test antenna 301 and the test antenna 302 2-12-0 ，p 2-12-60 ，p 2-12-120 ，p 2-12-180 ，p 2-12-240 The phase difference of the signals received by the antenna port 202 and respectively transmitted by the test antenna 301 and the test antenna 302 is obtained by fourier series fitting or fourier change calculation, and is recorded as
That is, the signal is transmitted from the test antenna 301The difference/relative value of the phase change to the antenna port 202 and the phase change of the signal from the test antenna 302 to the antenna port 202.
In the matrix acquisition operation, the tester determines a spatial propagation channel matrix P between the antenna port of the DUT and the test antenna from the amplitude variation of the signals acquired in operations 11 and 12 and the phase difference of the signals acquired in operations 26 and 27, as follows:
wherein p is xy Represents the amplitude change of the signal sent by the y test antenna to the x antenna port of the DUT, that is, the amplitude change of the signal sent by the y test antenna and received by the x antenna port;
a difference/relative value representing the phase change of the signal received by the x-th antenna port from the y-th test antenna to the DUT and the phase change of the signal received by the x-th antenna port from the n-th test antenna to the DUT, that is, the phase difference of the signals respectively transmitted by the y-th test antenna and the n-th test antenna received by the x-th antenna port; x =1,2,y =1,2. It can be seen that the spatial propagation channel matrix P is equivalent to the aforementioned spatial propagation channel matrix H.
Another aspect of the present disclosure provides a method for performing an over-the-air radiation test on a wireless device, and referring to fig. 3, the test method of this embodiment includes the following steps:
step S1, an amplitude change obtaining step, namely controlling each test antenna to respectively transmit signals, obtaining the amplitude of the signals received by each antenna port of the DUT, and accordingly obtaining the amplitude change of the signals received by each antenna port of the DUT and respectively transmitted by each test antenna. In this step, signal transceiving needs to be performed multiple times, and each time, only one test antenna transmits a signal, and other test antenna channels are closed. As an example, the obtaining of the amplitude of the Signal Received by each antenna port of the DUT may be obtained through a Power report of each antenna port of the DUT, such as RSSI (Received Signal Strength Indicator) or RSRP (Reference Signal Received Power).
And S2, a phase difference obtaining step, namely controlling any two test antennas to transmit signals for multiple times with different phase differences, obtaining the amplitude of a synthesized signal received by each antenna port of the DUT, and obtaining the phase difference of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas according to the amplitude of the signals received by each antenna port of the DUT and the amplitude of the synthesized signal. In this step, signal transceiving needs to be performed for multiple times, two test antennas transmit signals and other test antenna channels are closed in each execution, and optionally, in a single execution, one or more antenna ports of the DUT may be controlled to receive signals, and all antenna ports may also be controlled to receive signals simultaneously, so as to improve efficiency. As an example, the phase difference is calculated as follows: the phase difference is calculated by fourier series fitting or fourier transform according to the amplitude of the signal respectively transmitted by any two test antennas and the amplitude of the composite signal (i.e., the signal transmitted by the two test antennas in common) received by each antenna port of the DUT. As another example, the phase difference is calculated as: first, a composite amplitude reference value is calculated from the amplitudes of the signals received by each antenna port of the DUT and transmitted by any two test antennas, respectively. The synthesized amplitude reference value here is an amplitude calculation value of the synthesized signal obtained when the aforementioned separately transmitted signals are synthesized at each antenna port of the DUT 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.
And S3, a matrix obtaining step, namely obtaining a space propagation channel matrix between the antenna port of the DUT and the test antenna according to the obtained amplitude change and phase difference.
And S4, a testing step, namely loading an inverse matrix of the space propagation channel matrix on the testing signal so as to establish virtual cable connection between the antenna port of the DUT and the testing antenna and execute aerial radiation testing on the DUT. Optionally, the testing of this step includes at least one of: loading an inverse matrix of a space propagation channel matrix on a test signal to obtain a signal to be transmitted, and controlling a test antenna to transmit the signal to be transmitted to a DUT (device under test) so as to obtain the wireless receiving performance of the DUT; or, loading the inverse matrix of the space propagation channel matrix to the test signal to obtain a signal to be transmitted, and controlling the DUT to transmit the signal to be transmitted to the test antenna to obtain the wireless transmission performance of the DUT; or, controlling the DUT to transmit a test signal to the test antenna, and loading an inverse matrix of the spatial propagation channel matrix on the signal received by the test antenna to obtain the wireless transmission performance of the DUT.
The following takes a 4 × 4MIMO test as an example, and each step (including an amplitude variation acquisition step, a phase difference acquisition step, and a matrix acquisition step) performed to acquire a spatial propagation channel matrix between an antenna port of a DUT and a test antenna in the test method of the embodiment is exemplarily described. Referring to fig. 4a-4e, a 4 x 4MIMO test uses at least 4 test antennas 301, 302, 303, 304 and the dut has at least four antenna ports 201, 202, 203, 204. For convenience of data processing, in the amplitude variation acquisition step and the phase difference acquisition step described below, the signal transmitted by the test antenna is a signal subjected to normalization processing.
In the amplitude variation obtaining step S1, the following steps are specifically included:
step S11, as shown in FIG. 4a, control the test antenna 301 to transmit signals, and other test antennas do not transmit signals, and obtain the power report of 4 antenna ports of the DUT, thereby obtaining the amplitude p of the signals received by the 4 antenna ports 11 ，p 21 ，p 31 ，p 41 . Since the test antenna 301 emits the normalized signal, the amplitude p is directly measured 11 ，p 21 ，p 31 ，p 41 Determined as the measured signals received by the antenna ports 201, 202, 203, 204, respectivelyThe amplitude of the signal transmitted by the test antenna 301 varies.
Step S12, as shown in fig. 4b, similarly to step S11, controlling the test antenna 302 to transmit a signal, obtaining power reports of 4 antenna ports of the DUT, and accordingly obtaining the amplitude p of the signal received by the 4 antenna ports 12 ，p 22 ，p 32 ，p 42 And accordingly obtains the amplitude variation of the signal transmitted by the test antenna 302 received by the antenna ports 201, 202, 203, 204, respectively.
Step S13, as shown in fig. 4c, similarly to step S11, controlling the test antenna 303 to transmit a signal, obtaining power reports of 4 antenna ports of the DUT, and accordingly obtaining the amplitude p of the signal received by the 4 antenna ports 13 ，p 23 ，p 33 ，p 43 And accordingly obtains the amplitude variation of the signal transmitted by the test antenna 303 received by the antenna ports 201, 202, 203, 204, respectively.
Step S14, as shown in fig. 4d, similarly to step S11, controls the test antenna 304 to transmit signals, and reports the power of 4 antenna ports of the DUT, thereby obtaining the amplitude p of the signals received by the 4 antenna ports 14 ，p 24 ，p 34 ，p 44 And accordingly obtains the amplitude variation of the signal transmitted by the test antenna 304 received by the antenna ports 201, 202, 203, 204, respectively.
In the phase difference obtaining step S2, the following steps are specifically included:
in step S21, phase differences of signals respectively transmitted by the test antenna 301 and the test antenna 302 received by the 4 antenna ports of the DUT are acquired. As shown in fig. 4e, step S21 comprises the following sub-steps:
step S211, controlling 2 test antennas (301 and 302) to transmit signals with a phase difference of 0 degree, reading power report of DUT, and obtaining amplitude p of composite signal received by 4 antenna ports 1-12-0 ，p 2-12-0 ，p 3-12-0 ，p 4-12-0 。
Step S212, controlling 2 test antennas to emit signals with a phase difference of 90 degrees, reading power report of the DUT, and obtaining composite signals received by 4 antenna portsAmplitude p 1-12-90 ，p 2-12-90 ，p 3-12-90 ，p 4-12-90 。
Step S213, controlling 2 test antennas to emit signals with a phase difference of 180 degrees, reading power report of the DUT, and obtaining amplitude p of the composite signal received by 4 antenna ports 1-12-180 ，p 2-12-180 ，p 3-12-180 ，p 4-12-180 。
Step S214, controlling 2 test antennas to emit signals with a phase difference of 270 degrees, reading power reports of the DUT, and obtaining the amplitude p of the composite signals received by 4 antenna ports 1-12-270 ，p 2-12-270 ，p 3-12-270 ，p 4-12-270 。
Step S215, according to the amplitude p of the signal transmitted by the test antenna 301 received by the 4 antenna ports of the DUT obtained in step S11 11 ，p 21 ，p 31 ，p 41 And the amplitude p of the signal transmitted by the test antenna 302 received by the 4 antenna ports of the DUT obtained in step S12 12 ，p 22 ，p 32 ，p 42 And the amplitudes of the combined signals transmitted by the test antennas 301 and 302 received by the 4 antenna ports of the DUT obtained in steps S211 to S214, and the phase differences of the signals transmitted by the test antennas 301 and 302 received by the 4 antenna ports of the DUT are calculated. As an example, for the antenna port 201, the method for calculating the phase difference includes: a. according to the amplitude p of the signal received by the antenna port 201 and transmitted by the test antenna 301 11 And the amplitude p of the signal transmitted by the test antenna 302 12 The composite amplitude reference value of the two signals is calculated. The combined amplitude reference value is a calculated value of the amplitude of the combined signal obtained when the two signals are combined at the antenna port 201 with different phase differences. Alternatively, according to the cosine theorem, the amplitude of the composite signal of two signals and the phase difference between them can be calculated, for example, by the following formula:
where p _ rv represents the amplitude of the composite signal, i.e. the "composite amplitude reference value" mentioned above, δ represents the phase difference between the two signals, and different δ values are set according to the accuracy requirement of the solution, for example, δ is calculated every 5 ° from 0 ° to 360 °, and a mapping relation between δ and p _ rv is obtained from the calculation result, for example, δ is used as an argument, the corresponding p _ rv is a dependent variable, and the structure function p _ rv = f (δ). P is the amplitude of the combined signal transmitted by the test antennas 301 and 302, respectively, based on the combined amplitude reference value and the amplitude of the combined signal (i.e., the amplitude of the combined signal received by the antenna port 201 obtained in steps S211 to S214 and transmitted by the test antennas 301 and 302, respectively, which is p 1-12-0 ，p 1-12-90 ，p 1-12-180 ，p 1-12-270 ) The phase difference of the signals received by the antenna port 201 and transmitted by the test antennas 301 and 302, respectively, is calculated. An exemplary calculation method is: taking the phase difference δ' = {0,90,180,270} of the transmission signals of the 2 test antennas in steps S211 to S214 as an argument, and the amplitude p _ rx = { p } of the composite signal received by the corresponding antenna port 201 1-12-0 ,p 1-12-90 ,p 1-12-180 ,p 1-12-270 The function p _ rx = f (δ ') is constructed, and the phase difference is calculated from the relationship between the function p _ rv = f (δ) and the function p _ rx = f (δ'), for example, one way of calculating: the independent variable is plotted as an abscissa and the dependent variable is plotted as an ordinate, and the two functions are plotted in a coordinate system, and the function p _ rx = f (δ') is translated in the left and right directions so that the degree of coincidence with the function p _ rv = f (δ) is the highest (for example, determined by the sum of absolute values of differences corresponding to the ordinate), and the phase difference is determined from the coordinates of the translation.
In step S22, similarly to step S21, the phase differences of the signals transmitted by the test antennas 301 and 303, respectively, received by the 4 antenna ports of the DUT are acquired.
In step S23, similarly, the phase differences of the signals transmitted by the test antennas 301 and 304, respectively, received by the 4 antenna ports of the DUT are acquired.
Through the above steps S21 to S23, the phase difference of the signals received by each antenna port of the DUT and transmitted by any two test antennas among all 4 test antennas is obtained. It is understood that, for example, when the phase difference of the signals respectively transmitted by the test antenna 301 and the test antenna 302 in step S21 and the phase difference of the signals respectively transmitted by the test antenna 301 and the test antenna 303 in step S22 are obtained, that is, the phase difference of the signals respectively transmitted by the test antenna 302 and the test antenna 303 is obtained. Therefore, if the number of the test antennas is N, the information of the phase difference of the signals respectively transmitted by any two test antennas in the N test antennas can be obtained only by obtaining the phase difference of the signals respectively transmitted by any two test antennas (N-1) times.
It should be noted that, in the foregoing steps S211 to S214, the phase difference between the signals emitted by the two test antennas may be set according to the requirements of the test accuracy and efficiency, and when the phase difference is small, for example, the phase difference is at an interval of 30 °, that is, the phase difference between the two test antennas is 0 °,30 °,60 °,90 °,120 °,150 °,180 °,210 °,240 °,270 °,300 °, and 330 °, the signals are transmitted and received 12 times in step S21 to obtain the data for calculation, which is high in calculation accuracy but relatively time-consuming. On the other hand, if the phase difference is at intervals of 90 ° as shown in steps S211 to S214, only 4 times of transmission and reception are required, and the calculation accuracy is relatively low but the time consumption is small. The intervals of the phase difference may not be equal.
Corresponding to the foregoing embodiments of the method of performing over-the-air radiation testing on a wireless device, another aspect embodiment of the present disclosure provides an electronic device, comprising: a processor; a memory for storing a computer program executable by the processor; the processor executes the computer program to implement the foregoing method for performing an air radiation test on a wireless device, which is not described herein again. Fig. 5 shows a block diagram of the present embodiment, according to an embodiment of the electronic device. The electronic device may be a computer, a mobile phone, a tablet device, a messaging device, or other terminal device. The electronic device may comprise a memory 1001, a processor 1002 and a computer program stored on the memory 1001 and executable on the processor 1002. The processor 1002, when executing the computer program, implements the method of performing over-the-air radiation testing on a wireless device provided in the embodiments described above.
Optionally, the electronic device of this embodiment further includes: a communication interface 1003 for communicating between the memory 1001 and the processor 1002. Memory 1001 may include high-speed RAM memory and may also include non-volatile memory (e.g., at least one disk memory). If the memory 1001, the processor 1002, and the communication interface 1003 are implemented independently, the communication interface 1003, the memory 1001, and the processor 1002 may be connected to each other through a bus and perform communication with each other. The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 5, but this is not intended to represent only one bus or type of bus.
Optionally, in a specific implementation, if the memory 1001, the processor 1002, and the communication interface 1003 are integrated on one chip, the memory 1001, the processor 1002, and the communication interface 1003 may complete communication with each other through an internal interface.
The processor 1002 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present disclosure.
Corresponding to the foregoing embodiment of the method for performing an over-the-air radiation test on a wireless device, another embodiment of the present disclosure is a non-transitory computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the foregoing method for performing an over-the-air radiation test on a wireless device is implemented, and is not described herein again.
It should be noted that the drawings in the present disclosure are simplified schematic drawings, and are only used for schematically illustrating the positional relationship and the connection relationship between the parts in the embodiments.
In the description above, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In the present disclosure, the schematic representations of the terms described above are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present disclosure, "plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
While embodiments of the present disclosure have been shown and described above, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present disclosure, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present disclosure.
Claims (13)
1. A system for performing over the air radiation testing of a wireless device, the wireless device being a DUT having at least first and second antenna ports, the system comprising:
at least first and second test antennas for wireless communication with the DUT;
a tester to obtain a spatial propagation channel matrix between the DUT's antenna ports and the test antenna by performing the following operations:
obtaining amplitude variation, namely controlling each test antenna to respectively transmit signals, obtaining the amplitude of the signals received by each antenna port of the DUT, and accordingly obtaining the amplitude variation of the signals received by each antenna port of the DUT and respectively transmitted by each test antenna;
phase difference acquisition, namely controlling any two test antennas to transmit signals for multiple times with different phase differences, acquiring the amplitude of a synthesized signal received by each antenna port of the DUT, and acquiring the phase difference of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas according to the amplitude of the signals received by each antenna port of the DUT and the amplitude of the synthesized signal;
acquiring a matrix, and acquiring a spatial propagation channel matrix between an antenna port of the DUT and the test antenna according to the amplitude variation and the phase difference;
the tester is further configured to load an inverse of the spatial propagation channel matrix on a test signal to establish a virtual cable connection between an antenna port of the DUT and the test antenna to perform over-the-air radiation testing on the DUT.
2. The system according to claim 1, wherein said tester, in performing said phase difference obtaining operation, said obtaining a phase difference of signals respectively transmitted by any two of said test antennas received by each antenna port of said DUT according to an amplitude of the signal respectively transmitted by any two of said test antennas received by each antenna port of said DUT and an amplitude of said composite signal comprises:
and according to the amplitude of the signal respectively transmitted by any two of the test antennas and the amplitude of the synthesized signal received by each antenna port of the DUT, calculating the phase difference of the signal respectively transmitted by any two of the test antennas and received by each antenna port of the DUT through Fourier series fitting or Fourier transform.
3. The system according to claim 1, wherein said tester, in performing said phase difference obtaining operation, said obtaining a phase difference of signals respectively transmitted by any two of said test antennas received by each antenna port of said DUT according to an amplitude of the signal respectively transmitted by any two of said test antennas received by each antenna port of said DUT and an amplitude of said composite signal comprises:
calculating a composite amplitude reference value according to the amplitude of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas, wherein the composite amplitude reference value is the amplitude calculation value of the composite signal obtained when the respectively transmitted signals are combined at each antenna port of the DUT with different phase differences;
and calculating the phase difference of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas according to the synthesized amplitude reference value and the amplitude of the synthesized signal.
4. The system of claim 1, wherein said tester, in performing said amplitude variation acquisition operation and said phase difference acquisition operation, obtains the amplitude of the signal received by each antenna port of said DUT by reading a power report for each antenna port of said DUT.
5. The system of claim 1, further comprising: an anechoic chamber for housing at least the DUT and the test antenna.
6. The system of any of claims 1-4, wherein the tester to perform aerial radiation testing on the DUT comprises at least one of:
loading an inverse matrix of the spatial propagation channel matrix on the test signal to obtain a signal to be transmitted, and controlling the test antenna to transmit the signal to be transmitted to the DUT to obtain the wireless receiving performance of the DUT; or
Loading an inverse matrix of the space propagation channel matrix on the test signal to obtain a signal to be transmitted, and controlling the DUT to transmit the signal to be transmitted to the test antenna to obtain the wireless transmission performance of the DUT; or
And controlling the DUT to transmit the test signal to the test antenna, and loading an inverse matrix of the spatial propagation channel matrix on the signal received by the test antenna so as to obtain the wireless transmission performance of the DUT.
7. A method of performing over the air radiation testing on a wireless device, the wireless device being a DUT having at least first and second antenna ports, the method using at least first and second test antennas, the method comprising:
an amplitude variation obtaining step, controlling each test antenna to respectively transmit signals, obtaining the amplitude of the signals received by each antenna port of the DUT, and thus obtaining the amplitude variation of the signals received by each antenna port of the DUT and respectively transmitted by each test antenna;
a phase difference obtaining step of controlling any two of the test antennas to transmit signals for multiple times with different phase differences, obtaining an amplitude of a synthesized signal received by each antenna port of the DUT, and obtaining a phase difference of signals received by each antenna port of the DUT and respectively transmitted by any two of the test antennas according to the amplitude of the signal received by each antenna port of the DUT and the amplitude of the synthesized signal;
a matrix obtaining step, obtaining a space propagation channel matrix between the antenna port of the DUT and the test antenna according to the amplitude variation and the phase difference;
a test step of loading an inverse of the spatial propagation channel matrix on a test signal to establish a virtual cable connection between an antenna port of the DUT and the test antenna to perform an over-the-air radiation test on the DUT.
8. The method according to claim 7, wherein in the phase difference obtaining step, the obtaining the phase difference of the signals respectively transmitted by any two of the test antennas and received by each antenna port of the DUT according to the amplitude of the signal respectively transmitted by any two of the test antennas and the amplitude of the composite signal received by each antenna port of the DUT comprises:
and according to the amplitude of the signal respectively transmitted by any two of the test antennas and the amplitude of the synthesized signal received by each antenna port of the DUT, calculating the phase difference of the signal respectively transmitted by any two of the test antennas and received by each antenna port of the DUT through Fourier series fitting or Fourier transform.
9. The method according to claim 7, wherein in the phase difference obtaining step, the obtaining the phase difference of the signals respectively transmitted by any two test antennas received by each antenna port of the DUT according to the amplitudes of the signals respectively transmitted by any two test antennas received by each antenna port of the DUT and the amplitude of the resultant signal comprises:
calculating a composite amplitude reference value according to the amplitude of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas, wherein the composite amplitude reference value is the amplitude calculation value of the composite signal obtained when the respectively transmitted signals are combined at each antenna port of the DUT with different phase differences;
and calculating the phase difference of the signals received by each antenna port of the DUT and respectively transmitted by any two test antennas according to the synthesized amplitude reference value and the amplitude of the synthesized signal.
10. The method of claim 7, wherein in said amplitude variation obtaining step and said phase difference obtaining step, the amplitude of the signal received by each antenna port of said DUT is obtained by a tester reading a power report of each antenna port of said DUT.
11. The method according to any one of claims 7-10, wherein the testing step comprises at least one of:
loading an inverse matrix of the space propagation channel matrix on the test signal to obtain a signal to be transmitted, and controlling the test antenna to transmit the signal to be transmitted to the DUT so as to obtain the wireless receiving performance of the DUT; or
Loading an inverse matrix of the space propagation channel matrix on the test signal to obtain a signal to be transmitted, and controlling the DUT to transmit the signal to be transmitted to the test antenna to obtain the wireless transmission performance of the DUT; or
And controlling the DUT to transmit the test signal to the test antenna, and loading an inverse matrix of the spatial propagation channel matrix on the signal received by the test antenna so as to obtain the wireless transmission performance of the DUT.
12. An electronic device, comprising:
a processor;
a memory for storing a computer program executable by the processor;
wherein the processor, when executing the computer program, implements the method of any of claims 7-11.
13. Non-transitory computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the method according to any one of claims 7-11.
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