WO2021003838A1

WO2021003838A1 - Near-field channel simulation measurement system and method

Info

Publication number: WO2021003838A1
Application number: PCT/CN2019/105856
Authority: WO
Inventors: 张翔; 王正鹏; 郭宇航; 王飞龙; 李雷; 刘晓龙; 潘冲; 任雨鑫; 吴翔; 张宇; 徐菲; 魏贵明
Original assignee: 中国信息通信研究院
Priority date: 2019-07-05
Filing date: 2019-09-15
Publication date: 2021-01-14
Also published as: CN112187385A; CN112187385B

Abstract

Disclosed are a near-field channel simulation measurement system and method, which solve the problem that an existing system and method cannot implement wireless measurement under near-field conditions. The system comprises a multi-channel device to be tested, a measurement dark box, an amplitude and phase regulation network, a probe antenna, and a main control computer. Said multi-channel device and the probe antenna are both placed in the measurement dark box; the amplitude and phase regulation network is used for regulating the amplitude and phase of the probe antenna; the probe antenna is used for sending a space radiation signal to said multi-channel device; said multi-channel device is used for receiving the space radiation signal; the main control computer is used for controlling the amplitude and phase regulation network and said multi-channel device, and calculates a transmission matrix between the probe antenna and said multi-channel device according to the signal amplitude and energy received by said multi-channel device, and the amplitude and phase of the probe antenna. The method is applied to the system. The present invention implements the near-field wireless measurement of an MIMO channel system.

Description

Near-field channel simulation measurement system and method

This application claims the priority of a Chinese patent application filed with the State Intellectual Property Office of China, the application number is 201910605582.9, and the invention title is "a near-field channel simulation measurement system and method" on July 5, 2019. The earlier application The entire content is incorporated into this application by reference.

Technical field

The invention relates to the technical field of mobile communication measurement, in particular to a near-field channel simulation measurement system and method.

Background technique

Traditional multiple-input multiple-output (MIMO) channel simulation test systems are generally implemented based on radio frequency cable connection channel emulators. For channel test systems where the device under test is a mobile phone, it is necessary to apply an open method to bypass the mobile phone antenna and directly The channel emulator cable is connected to the mobile phone transceiver module, which brings measurement inconvenience and does not meet the user's requirements; the MIMO channel measurement system that has been implemented so far is a dual-port MIMO channel developed by Fan Wei of Aalborg University in Denmark The shortcomings of the simulation measurement system are that the system calibration method is complicated, the portability is poor, and it is difficult to be extended to the device under test with more than 3 ports; for the MIMO channel simulation measurement system, the existing technology also uses a large-space dark room to test it. It has high requirements on the test site environment.

Summary of the invention

The invention provides a near-field channel simulation measurement system and method, which solves the problem that the existing system and method cannot achieve wireless measurement under near-field conditions.

An embodiment of the present invention provides a near-field channel simulation measurement system, which includes: a multi-channel device under test, a measurement dark box, an amplitude and phase control network, a probe antenna, and a main control computer; the multi-channel device under test is used to receive the The space radiation signal sent by the probe antenna sends an uplink signal; the amplitude and phase control network is used to adjust the amplitude and phase of the probe antenna according to the command of the main control computer to receive the uplink signal; the probe antenna, The main control computer is used to send the space radiation signal to the multi-channel equipment under test, and to receive the uplink signal sent by the amplitude-phase control network; the main control computer is used to send the probe antenna to the amplitude-phase control network Amplitude and phase; also used to control the switch of each channel of the multi-channel DUT; also used to calculate the amplitude and phase of the probe antenna according to the signal amplitude and energy received by the multi-channel DUT The transmission matrix between the probe antenna and the multi-channel device under test.

Further, the system further includes: a multi-channel channel simulator and a base station simulator; the base station simulator, which sends downlink signals to the multi-channel base station simulator and receives uplink signals; the multi-channel channel simulator, It is used to simulate different channel environments and transmit to the probe antenna; the main control computer is also used to control the switch of the base station simulator and control the channel environment simulated by the multi-channel channel simulator.

Further, the system further includes: a vector network analyzer; the vector network analyzer is used to read the amplitude and phase of the signal received by the multi-channel device under test.

Preferably, the main control computer controls the switch of each channel of the multi-channel device under test through a single-pole multi-throw switch.

Preferably, the multi-channel device to be tested is fixed in the measuring dark box by a fixing bracket.

Preferably, the minimum distance between the probe antennas is 0.3 times the wavelength of the spatial radiation signal.

Further, the probe antennas are uniformly or non-uniformly distributed, and the probe antennas are arranged on a straight line or a curve, or on any plane or curved surface.

Further, the minimum value of the distance between the probe antenna and the multi-channel device under test is the wavelength of the spatial radiation signal, and the maximum value is 20 meters.

Preferably, the measurement dark box is a closed anechoic chamber whose shielding index meets industry standards, and absorbing materials are laid on the surface, and the absorbing materials are polyurethane foam, ferrite, and absorbing sponge.

The embodiment of the present invention also provides a near-field channel simulation measurement method, which is applied to the system, and each of the probe antennas is individually turned on to obtain the corresponding multi-channel device under test when the probe antenna is turned on. The amplitude of the signal, that is, the amplitude of the estimated value of the scattering coefficient; each of the probe antennas is individually turned off to obtain the amplitude of the signal received by each channel of the multi-channel device under test when the probe antenna is turned off, namely The amplitude of the remaining composite scattering coefficient; each of the probe antennas is individually turned on and the phase is set, and all other probe antennas are turned off, according to the signal energy received by all channels of the corresponding multi-channel device under test when the probe antenna is turned on , The magnitude of the estimated value of the scattering coefficient and the magnitude of the remaining composite scattering coefficient are calculated to obtain the phase of the signal received by each channel of the multi-channel DUT; according to the signal received by each channel of the multi-channel DUT The amplitude and phase are calculated to obtain the transmission matrix between the probe antenna and the multi-channel device under test.

The beneficial effects of the present invention include: the present invention proposes a near-field wireless MIMO channel simulation measurement system, which can realize channel simulation of multi-channel equipment under test without radio frequency interface in a limited near-field space, and can significantly improve measurement efficiency, It has great potential for promotion in the future; in addition, the present invention does not rely on measuring the amplitude and phase information in the multi-channel under-test system, and only needs to obtain the amplitude information to quickly obtain the required transmission matrix, which greatly saves the black box or The construction and use cost of the darkroom.

Description of the drawings

Figure 1 is an embodiment of a near-field channel simulation measurement system;

Fig. 2 is an embodiment of a near-field channel simulation measurement system including a multi-channel channel simulator;

Fig. 3 is an embodiment of a near-field channel simulation measurement system including a vector network analyzer;

Fig. 4 is an embodiment of the flow of a near-field channel simulation measurement method.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described clearly and completely below in conjunction with specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

The innovations of the present invention are as follows: First, the present invention replaces the traditional measurement method that relies on radio frequency cables by constructing a transmission matrix, and solves the problem of MIMO channel simulation measurement of the multi-channel under-test system without radio frequency cables; second, the present invention adopts Field measurement does not require that the distance between the probe antenna and the multi-port equipment under test meets the far-field conditions; third, the present invention does not rely on the phase information in the multi-channel equipment under test, and can be obtained by measuring its amplitude information Space transmission matrix.

The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Figure 1 is an embodiment of a near-field channel simulation measurement system, which adopts a near-field measurement method to achieve MIMO channel measurement. As an embodiment of the present invention, a near-field channel simulation measurement system includes: multi-channel equipment under test 1. Measurement Black box 2, amplitude and phase control network 4, probe antenna 3, main control computer 5.

The multi-channel device under test and the probe antenna are all placed in the measurement dark box; the multi-channel device under test is used to receive the space radiation signal sent by the probe antenna and send an uplink signal; the amplitude and phase control network , Used to adjust the amplitude and phase of the probe antenna according to the command of the main control computer to receive the uplink signal; the probe antenna is used to send the space radiation signal to the multi-channel device under test, and receive The uplink signal sent by the amplitude-phase control network; the main control computer is used to send the amplitude and phase of the probe antenna to the amplitude-phase control network; also used to control each channel of the multi-channel device under test The switch; is also used to calculate the transmission matrix between the probe antenna and the multi-channel device under test according to the signal amplitude and energy received by the multi-channel device under test, and the amplitude and phase of the probe antenna:

Where, A is the transmission matrix, K is the number of probe antennas, N is the number of channels of the multi-channel DUT, h _kn is the kth probe antenna to the multi-channel DUT The estimated value of the scattering coefficient of the n-th channel, α _kn and φ _kn are the amplitude and phase of h _kn respectively,

Is the phase of the k-th probe antenna,

Is the composite scattering coefficient of the space radiation signal received by the nth channel of the multi-channel DUT,

Remove the remaining composite scattering coefficient of h _kn for the nth channel of the multi-channel device under test,

Respectively

The amplitude and phase of

Is the phase of the kth probe antenna

Corresponding to the signal energy received by all channels of the multi-channel device under test.

In the embodiment of the present invention, the amplitude and phase control network includes a phase shifter and an attenuator, and the number of phase shifters and attenuators is greater than or equal to the number of probe antennas. To control the phase and amplitude of the radiated signal of each probe antenna.

In the embodiment of the present invention, as a signal radiating terminal, each of the probe antennas can individually radiate signals to the multi-channel device under test, or any number of the probe antennas can be used to radiate signals; as a signal receiving terminal Each channel of the multi-channel device under test receives the spatial radiation signal radiated by the probe antenna.

It should be noted that when calculating the composite scattering coefficient of the space radiation signal received by the nth channel of the multi-channel equipment under test, the phase of all phase shifters in the amplitude and phase control network is set to 0 degrees, and the attenuator is set It is 0dB.

In the embodiment of the present invention, the amplitude α _{kn of the} estimated value of the scattering coefficient from the k-th probe antenna to the n-th channel of the multi-channel DUT can be obtained by simple switch signal measurement: The phase control network sets the attenuation value of the k-th probe antenna to 0dB, so that the k-th probe antenna is in the on state, and by setting the attenuation value of all other probe antennas to the maximum attenuation value, all other probe antennas are in the off state When the k-th probe antenna is turned on, the amplitude of the space radiation signal received by each channel of the multi-channel equipment under test is the desired value. Further, by adjusting the probe antennas so that each probe antenna is individually turned on, the amplitude of the estimated value of the scattering coefficient from each probe antenna to each channel of the multi-channel equipment under test can be obtained, that is, the amplitude of the spatial radiation signal .

It should be noted that the multi-channel device under test can be a mobile phone or other devices, and the amplitude information can be directly read through software.

In the embodiment of the present invention, the remaining composite scattering coefficient of the nth channel of the multi-channel device under test

In order to turn off the k-th probe antenna, the signal received at the n-th channel of the multi-channel device under test, the amplitude of the remaining composite scattering coefficient of the n-th channel of the multi-channel device under test, is When the probe antenna is used, the amplitude of the signal received at the nth channel of the multi-channel DUT can be read by the multi-channel DUT or other measuring equipment, such as a vector network analyzer. This is not done here. Specially limited.

As an embodiment of the present invention, the phase φ _kn of the spatial radiation signal sent by the k-th probe antenna received by the nth channel of the multi-channel equipment under test is obtained by setting the phase shifter of the amplitude-phase control network: Set the phase of the kth probe antenna to

When the phases of all other probe antennas are set to 0 degrees, the energy of the signals that can be received sequentially through the multi-channel device under test terminal can be used to obtain the phase φ _kn of the spatial radiation signal sent by the k-th probe antenna:

among them,

The phases of the kth probe antenna are

Corresponding to the signal energy received by all channels of the multi-channel DUT,

Is the remaining composite scattering coefficient of the nth channel of the multi-channel device under test,

Respectively

_Kn is the magnitude of the estimated value of the scattering coefficient from the k-th probe antenna to the n-th channel of the multi-channel device under test, preferably,

Is known,

φ _{kn is} obtained by solving the formula.

Further, by setting a set of phases separately for each probe antenna, the phase information of the signals from all the probes to each channel of the multi-channel equipment under test, that is, the phase information of the spatial radiation signal can be obtained.

In the embodiment of the present invention, the main control computer controls the switch of each channel of the multi-channel DUT through a single-pole multi-throw switch, and the single-pole multi-throw switch is connected to the multi-channel DUT through a radio frequency cable The number of switches of the single-pole multi-throw switch is greater than or equal to the number of channels of the multi-channel device under test.

In the embodiment of the present invention, the probe antenna may be a narrowband antenna with a bandwidth of less than 10%, or a broadband antenna with a bandwidth of 10% to 200%, and the bandwidth of the probe antenna refers to the highest operating rate of the probe antenna The frequency minus the lowest operating frequency is divided by 2 (highest operating frequency-lowest operating frequency)/2), the minimum distance between the probe antennas is greater than or equal to 0.3 times the lowest operating wavelength, and the lowest operating wavelength refers to the space The wavelength of the radiation signal.

Preferably, the probe antenna may be a single-line polarization antenna, a dual-line polarization antenna, a single circular polarization antenna or a double circular polarization antenna, the probe antennas are uniformly or non-uniformly distributed, and the probe antennas are arranged in On a straight line or on a curve or on any plane or curved surface.

As an embodiment of the present invention, the minimum distance between the probe antenna and the multi-channel device under test is the wavelength of the spatial radiation signal, and the maximum value is 20 meters.

In the embodiment of the present invention, the multi-channel device to be tested is fixed in the measuring dark box by a fixed bracket, and the measuring dark box is a closed anechoic chamber whose shielding index meets industry standards. The surface is covered with absorbing materials and absorbing materials. It is polyurethane foam, ferrite and wave absorbing sponge.

As an embodiment of the present invention, after the transmission matrix is obtained, further, the amplitude-phase control network can obtain at least one of the following system parameters according to the inverse matrix of the transmission matrix: reference number received power (RSRP), Throughput rate, bit error rate. It should be noted that the method for obtaining system parameters through the amplitude-phase control network is the prior art, and will not be specifically described here.

The embodiment of the present invention proposes a new near-field wireless MIMO channel simulation measurement system. The system obtains the transmission matrix required for channel simulation by measuring the transmission coefficient amplitude of each channel between K measuring probe antennas and N-channel equipment under test , So as to realize the MIMO channel simulation measurement without radio frequency cable connecting N-channel equipment under test.

Fig. 2 is an embodiment of a near-field channel simulation measurement system including a multi-channel channel emulator to simulate different channels. As an embodiment of the present invention, a near-field channel simulation measurement system includes: a multi-channel device under test 1 , Measurement dark box 2, amplitude and phase control network 4, probe antenna 3, main control computer 5, base station simulator 6, multi-channel channel simulator 7.

The multi-channel device under test and the probe antenna are all placed in the measurement dark box; the multi-channel device under test is used to receive the space radiation signal sent by the probe antenna and send an uplink signal; the amplitude and phase control network , Used to adjust the amplitude and phase of the probe antenna according to the command of the main control computer to receive the uplink signal; the probe antenna is used to send the space radiation signal to the multi-channel device under test, and receive The uplink signal sent by the amplitude-phase control network; the main control computer is used to send the amplitude and phase of the probe antenna to the amplitude-phase control network; also used to control each channel of the multi-channel device under test The switch; is also used to calculate the transmission matrix between the probe antenna and the multi-channel device under test according to the signal amplitude and energy received by the multi-channel device under test, and the amplitude and phase of the probe antenna.

The base station simulator is used to send downlink signals and receive uplink signals to the multi-channel channel simulator; the multi-channel channel simulator is used to simulate different channel environments and transmit them to the probe antenna; the master The control computer is also used to control the switch of the base station simulator and control the channel environment simulated by the multi-channel channel simulator.

As an embodiment of the present invention, the base station simulator sends downlink signals and receives uplink signals, and the multi-channel channel simulator is used to simulate different channel models, for example, to simulate the actual wireless signal fading environment in the field, or another example, a channel environment with external interference.

As an embodiment of the present invention, the inverse matrix of the transmission matrix is placed in the multi-channel channel simulator to eliminate the interference and fading effects in the dark box. The standard simulation channel system function of the device is multiplied as a new channel simulation system function. Through the multi-channel channel simulator, at least one system parameter of the MIMO system is measured: reference signal received power (RSRP), throughput rate, bit error rate.

It should be noted that the system parameters include at least reference signal received power (RSRP), throughput rate, and bit error rate, and may also include other parameters related to the MIMO channel, which are not particularly limited here.

In the embodiment of the present invention, the device to be tested is fixed on a fixed bracket and placed in the measurement dark box.

The embodiment of the present invention quickly obtains the transmission matrix by building a near-field channel measurement system, thereby obtaining indicators such as the throughput rate of the channel system, and adopts a wireless transmission mode, which is highly practical.

Figure 3 is an embodiment of a near-field channel simulation measurement system including a vector network analyzer. The vector network analyzer is used to read the amplitude and energy of the multi-channel device under test. As an embodiment of the present invention, a near-field channel The simulation measurement system includes: multi-channel equipment under test 1, measurement dark box 2, amplitude and phase control network 4, probe antenna 3, main control computer 5, base station simulator 6, multi-channel channel simulator 7, and vector network analyzer 8.

The multi-channel device under test and the probe antenna are all placed in the measurement dark box; the multi-channel device under test is used to receive the space radiation signal sent by the probe antenna and send an uplink signal; the amplitude and phase control network , Used to adjust the amplitude and phase of the probe antenna according to the command of the main control computer to receive the uplink signal; the probe antenna is used to send the space radiation signal to the multi-channel device under test, and receive The uplink signal sent by the amplitude-phase control network; the main control computer is used to send the amplitude and phase of the probe antenna to the amplitude-phase control network; also used to control each channel of the multi-channel device under test The switch; is also used to calculate the transmission matrix between the probe antenna and the multi-channel device under test according to the signal amplitude and energy received by the multi-channel device under test, and the amplitude and phase of the probe antenna; The base station simulator is used to establish a connection with the multi-channel channel simulator; the multi-channel channel simulator is used to simulate different channel environments and transmit to the probe antenna; the main control computer also uses To control the switch of the base station simulator to control the channel environment simulated by the multi-channel channel simulator.

The vector network analyzer is used to read the amplitude and phase of the signal received by the multi-channel device under test.

As an embodiment of the present invention, the vector network analyzer only needs to read the amplitude and energy of the signal received by each channel of the multi-channel device under test, and does not need to measure the phase of the received signal. It should be noted that the vector network analyzer can also directly read the phase of the received signal, but the measurement method is complicated and the measurement accuracy of the system is insufficient.

The near-field channel measurement system proposed in the embodiment of the present invention can effectively realize the "wireless cable" connection, which is the same as the cable transmission. The "wireless cable" connection also realizes signal isolation between different virtual cables, and ideally each The loss of the virtual cable is balanced. In addition, the relative phase difference between different virtual cables does not affect the throughput test, so that the wireless measurement of the system parameters can be quickly and accurately realized in the near field condition.

Fig. 4 is an embodiment of the flow of a near-field channel simulation measurement method, which is applied to the near-field channel simulation measurement system. As an embodiment of the present invention, a near-field channel simulation measurement method includes the following steps:

Step 101: Turn on each of the probe antennas separately to obtain the amplitude of the signal received by each channel of the multi-channel device under test corresponding to when the probe antenna is turned on, that is, the amplitude of the estimated value of the scattering coefficient.

In step 101, each of the probe antennas is individually turned on by adjusting the amplitude and phase control network, that is, the amplitude attenuation of the probe antenna that needs to be turned on is set to 0 dB, and the amplitude attenuation of other probe antennas is set to the maximum value.

In step 101, the amplitude of the received signal of each channel of the multi-channel device under test can be obtained by the multi-channel device under test, can also be obtained by a vector network analyzer, or can be obtained by other instruments that measure signal amplitude. , There is no special restriction here. The amplitude of the signal received by each channel of the multi-channel DUT is a set of amplitude values, and the number of the set of values is the number of the probe antennas. Therefore, the signal received at the multi-channel DUT is The amplitude is a two-dimensional matrix, and the dimension of the matrix is equal to the number of probe antennas * the number of channels of the multi-channel device under test.

Step 102: Turn off each of the probe antennas individually to obtain the amplitude of the signal received by each channel of the corresponding multi-channel device under test when the probe antenna is turned off, that is, the amplitude of the remaining composite scattering coefficient.

In step 102, each of the probe antennas is individually turned off, and the amplitude of the signal received by each channel of the multi-channel device under test corresponding to each probe antenna is turned off as a set of amplitude vectors. The number is the number of channels of the device under test; further, all probe antennas are turned off to obtain the amplitude of the remaining composite scattering coefficient, which is a two-dimensional matrix whose dimension is equal to the number of probe antennas * State the number of channels of the multi-channel device under test.

Step 103: Turn on each of the probe antennas individually and set the phase, turn off all other probe antennas, and estimate the scattering coefficient based on the signal energy received by all channels of the multi-channel device under test corresponding to when the probe antenna is turned on The magnitude of the value and the magnitude of the remaining composite scattering coefficient are calculated to obtain the phase of the signal received by each channel of the multi-channel DUT:

Where K is the number of probe antennas, N is the number of channels of the multi-channel DUT, h _kn the scattering coefficient from the kth probe antenna to the nth channel of the multi-channel DUT Estimated values, α _kn and φ _kn are respectively the amplitude and phase of the k-th probe antenna scattering coefficient estimated value received by the n-th channel of the multi-channel DUT,

Is the phase of the k-th probe antenna,

Is the remaining composite scattering coefficient of the nth channel of the multi-channel device under test

Respectively

The amplitude and phase of

Is the phase of the kth probe antenna

In step 103, the phases are individually set for each of the probe antennas, which is achieved through the amplitude and phase control network. For example, a set of phases is sequentially set for the kth probe antenna as: {φ ₁ ,... _q ,...φ _Q }, the phases of the other probe antennas are all set to 0 degrees, so that the k-th probe antenna is in the on state, and the other probe antennas are in the off state, then the multi-channel DUT can receive in turn To a group of space radiation signals, the energy is

The phase of the spatial radiation signal sent by the k-th probe antenna received by the n-th channel of the multi-channel equipment under test can be calculated by reading the energy:

among them,

The phases of the kth probe antenna are

Respectively

α _kn ,

Is known,

φ _{kn is} obtained by solving the formula.

Further, by setting a set of phases separately for each probe antenna, the phase information of the signals from all the probes to each channel of the multi-channel equipment under test, that is, the phase information of the spatial radiation signal can be obtained. Step 104: Calculate the transmission matrix between the probe antenna and the multi-channel device under test according to the amplitude and phase of the signal received by each channel of the multi-channel device under test:

Where A is the transmission matrix, K is the number of probe antennas, N is the number of channels of the multi-channel device under test, h _{kn is the distance between} the kth probe antenna and the multi-channel device under test The estimated value of the scattering coefficient of the n-th channel, α _kn and φ _kn are respectively the amplitude and phase of the spatial radiation signal sent by the k-th probe antenna received by the n-th channel of the multi-channel equipment under test.

Further, the method further includes: inputting the inverse matrix of the transmission matrix into a multi-channel channel simulator or an amplitude-phase control network to obtain at least one of the following system parameters: reference signal received power, throughput rate, bit error rate .

The near-field channel simulation measurement method proposed in the embodiment of the present invention does not depend on the phase information of the device under test, and the transmission matrix can be quickly and accurately obtained through the amplitude information of the device under test, without the need to build additional phase coherent links, and is practical Strong and high reliability.

It should be noted that the terms "include", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or equipment including a series of elements not only includes those elements, but also includes no Other elements clearly listed, or also include elements inherent to the process, method, commodity or equipment. If there are no more restrictions, the element defined by the sentence "including a..." does not exclude the existence of other identical elements in the process, method, commodity, or equipment that includes the element.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus the necessary general hardware platform, and of course it can also be implemented by hardware, but in many cases the former is a better implementation. the way. Based on this understanding, the technical solution of the present invention essentially or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions to make a A terminal device (which may be a mobile phone, a personal computer, a server, or a network device, etc.) executes the method described in each embodiment of the present invention.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications are also The protection scope of the present invention should be considered.

Claims

A near-field channel simulation measurement system, which is characterized by comprising: a multi-channel under-test device, a measurement dark box, an amplitude and phase control network, a probe antenna, and a main control computer;

The multi-channel equipment under test and the probe antenna are all placed in the measurement dark box;

The multi-channel device under test is used to receive the space radiation signal sent by the probe antenna and send an uplink signal;

The amplitude and phase control network is configured to adjust the amplitude and phase of the probe antenna according to the command of the main control computer, and receive the uplink signal;

The probe antenna is used to send the space radiation signal to the multi-channel device under test, and receive the uplink signal sent by the amplitude and phase control network;

The master computer,

Used to send the amplitude and phase of the probe antenna to the amplitude and phase control network;

It is also used to control the switch of each channel of the multi-channel device under test;

It is also used to calculate the transmission matrix between the probe antenna and the multi-channel device under test according to the signal amplitude and energy received by the multi-channel device under test, and the amplitude and phase of the probe antenna.
A near-field channel simulation measurement system, characterized in that the transmission matrix between the probe antenna and the multi-channel device under test is:

Where, A is the transmission matrix, K is the number of probe antennas, N is the number of channels of the multi-channel DUT, h kn is the kth probe antenna to the multi-channel DUT The estimated value of the scattering coefficient of the n-th channel, α kn and φ kn are the amplitude and phase of h kn respectively,
Is the phase of the k-th probe antenna,
Is the composite scattering coefficient of the space radiation signal received by the nth channel of the multi-channel DUT,
Remove the remaining composite scattering coefficient of h kn for the nth channel of the multi-channel device under test,
Respectively
The amplitude and phase of
Is the phase of the kth probe antenna
Corresponding to the signal energy received by all channels of the multi-channel device under test.
The near-field channel simulation measurement system of claim 1, further comprising: a multi-channel channel simulator and a base station simulator;

The base station simulator is configured to send downlink signals to the multi-channel base station simulator and receive uplink signals;

The multi-channel channel simulator is used to simulate different channel environments and transmit to the probe antenna;

The main control computer is also used to control the switch of the base station simulator, and control the channel environment simulated by the multi-channel channel simulator.
The near-field channel simulation measurement system according to any one of claims 1 to 3, further comprising: a vector network analyzer;

The vector network analyzer is used to read the amplitude and phase of the signal received by the multi-channel device under test.
The near-field channel simulation measurement system according to claim 4, wherein the main control computer controls the switch of each channel of the multi-channel DUT through a single-pole multi-throw switch.
The near-field channel simulation measurement system according to claim 4, wherein the multi-channel DUT is fixed in the measurement dark box by a fixing bracket.
The near-field channel simulation measurement system according to claim 4, wherein the minimum distance between the probe antennas is 0.3 times the wavelength of the spatial radiation signal.
The near-field channel simulation measurement system according to claim 4, wherein the probe antennas are uniformly or non-uniformly distributed, and the probe antennas are arranged on a straight line or a curve or any plane or curved surface.
The near-field channel simulation measurement system according to claim 4, wherein the minimum distance between the probe antenna and the multi-channel device under test is the wavelength of the spatial radiation signal, and the maximum value is 20 meters .
The near-field channel simulation measurement system according to claim 4, wherein the measurement dark box is a closed anechoic chamber whose shielding index meets industry standards, and the surface is covered with absorbing materials, and the absorbing materials are polyurethane foam and ferrite. , Absorbing sponge.
A near-field channel simulation measurement method, applied to the system of claims 1-9, characterized in that it comprises the following steps:

Turn on each of the probe antennas individually to obtain the amplitude of the signal received by each channel of the corresponding multi-channel device under test when the probe antenna is turned on, that is, the amplitude of the estimated value of the scattering coefficient;

Turn off each of the probe antennas individually to obtain the amplitude of the signal received by each channel of the corresponding multi-channel device under test when the probe antenna is turned off, that is, the amplitude of the residual composite scattering coefficient;

Turn on each of the probe antennas individually and set the phase, and turn off all other probe antennas, according to the signal energy received by all channels of the multi-channel device under test corresponding to when the probe antenna is turned on, and the magnitude of the estimated scattering coefficient , The amplitude of the remaining composite scattering coefficient is calculated to obtain the phase of the signal received by each channel of the multi-channel DUT;

According to the amplitude and phase of the signal received by each channel of the multi-channel DUT, the transmission matrix between the probe antenna and the multi-channel DUT is calculated.
The method of claim 11, wherein the phase of the signal received by each channel is:

Where K is the number of probe antennas, N is the number of channels of the multi-channel DUT, h kn the scattering coefficient from the kth probe antenna to the nth channel of the multi-channel DUT The estimated values, α kn and φ kn are respectively the amplitude and phase of the spatial radiation signal sent by the k-th probe antenna received by the n-th channel of the multi-channel equipment under test,
Is the phase of the k-th probe antenna,
Is the composite scattering coefficient of the space radiation signal received by the nth channel of the multi-channel DUT,
Remove the remaining composite scattering coefficient of h kn for the nth channel of the multi-channel device under test,
Respectively
The amplitude and phase of
Is the phase of the kth probe antenna
Corresponding to the signal energy received by all channels of the multi-channel device under test.
The method of claim 12, wherein the transmission matrix is:

Where A is the transmission matrix, K is the number of probe antennas, N is the number of channels of the multi-channel device under test, h kn is the distance between the kth probe antenna and the multi-channel device under test The estimated value of the scattering coefficient of the n-th channel, α kn and φ kn are respectively the amplitude and phase of the spatial radiation signal sent by the k-th probe antenna received by the n-th channel of the multi-channel equipment under test.