Channel conduction test apparatus, method, control apparatus, and storage medium

Abstract

The application provides a channel transmission test device, a method, a control device and a storage medium; the method comprises the following steps: receiving M input signals, and dividing each signal in the M input signals into N first branch signals, wherein the M and the N are positive integers greater than or equal to 2; performing phase adjustment processing on the N first branch signals corresponding to one input signal in the M input signals, to obtain N adjusted signals; and respectively synthesizing M-1 first branch signals corresponding to different input signals and one adjusted signal to obtain N first output signals. Through the application, controllable adjustment of the correlation of output signals can be realized while reducing the hardware complexity.

Description

Technical Field

[0001] This application relates to communication technology, and more particularly to a channel conduction testing device, method, control device, and storage medium. Background Technology

[0002] In Multiple-Input Multiple-Output (MIMO) wireless communication systems, channel correlation affects the ill-conditioned nature of the channel response matrix. This means the channel response matrix is ​​extremely sensitive to input disturbances during numerical calculations, leading to unstable results and significantly amplified errors when solving linear equations or performing matrix operations, further impacting communication quality and throughput. Correlation techniques typically assess channel correlation through antenna correlation testing or extraction of channel state information during communication. However, these methods are easily affected by factors such as the relative positions of transceivers, antenna performance, spatial obstruction, and the electromagnetic environment. The testing process often involves multiple parameters changing in tandem, resulting in insufficient consistency and comparability between different test results, and making experimental reproduction difficult.

[0003] Meanwhile, altering channel correlation by changing spatial location or other means can easily introduce signal strength fluctuations, making it difficult to analyze the impact of channel correlation on communication performance under controlled variable conditions. Furthermore, existing channel testing devices typically involve separate control of multiple signal paths when implementing correlation adjustment, resulting in a large number of components, complex structures, and high hardware costs. Moreover, the correlation adjustment range and accuracy are easily affected by other channel coupling relationships. Summary of the Invention

[0004] This application provides a channel conduction testing device, method, control device, and storage medium that can achieve controllable adjustment of output signal correlation while reducing hardware complexity.

[0005] The technical solution of this application embodiment is implemented as follows: This application provides a channel conduction testing device, including: an input distribution layer, a phase shifting circuit, and an output synthesis layer; The input allocation layer is used to receive M input signals and divide each of the M input signals into N first branch signals, wherein M and N are positive integers greater than or equal to 2; The phase-shifting circuit is used to perform phase adjustment processing on the N first branch signals corresponding to one of the M input signals to obtain N adjustment signals. The output synthesis layer is used to synthesize the M-1 first branch signals corresponding to different input signals and the 1 adjustment signal to obtain N first output signals.

[0006] This application provides a channel conduction testing method, which is implemented based on the channel conduction testing equipment described in this application. The method includes: Receive M input signals and divide each of the M input signals into N first branch signals; Phase adjustment processing is performed on the N first branch signals corresponding to one of the M input signals to obtain N adjustment signals; The M-1 first branch signals corresponding to different input signals are combined with the 1-channel adjustment signal to obtain N first output signals.

[0007] This application embodiment provides a control device, the control device comprising: Memory is used to store executable instructions or computer programs. The processor is configured to execute computer-executable instructions or computer programs stored in the memory to control the signal source to apply input signals to the channel conduction test device described in the embodiments of this application, adjust the parameters of the channel conduction test device, and read the output signals of the channel conduction test device, so as to implement the channel conduction test method described in the embodiments of this application.

[0008] This application provides a computer-readable storage medium storing computer-executable instructions or computer programs, which, when executed by a processor, implement the channel conduction testing method provided in this application.

[0009] This application provides a computer program product, including a computer program or computer executable instructions. When the computer program or computer executable instructions are executed by a processor, they implement the channel conduction testing method provided in this application.

[0010] The embodiments of this application have the following beneficial effects: By dividing each of the M input signals into N first branch signals, and synthesizing the M-1 first branch signals corresponding to different input signals with one phase-adjusted signal, N first output signals are obtained, thus realizing the combined mapping between the M input signals and the N first output signals. Since the phase adjustment process acts on the N first branch signals corresponding to one input signal, the phase contribution of that input signal in each output signal can be controlled, thereby enabling adjustment of the synthesized result of the N first output signals. Compared to adjusting multiple input signals separately, this method alters the correlation characteristics between output signals while maintaining a relatively consistent amplitude across the branch signals, thereby controlling the correlation of the MIMO channel and reducing the number of phase adjustment devices and the complexity of the device implementation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram illustrating the application of the communication channel of the MIMO M×N communication system provided in the embodiments of this application; Figure 2 This is a first structural schematic diagram of the MIMO 2×2 analog domain channel conduction test device provided in the embodiments of this application; Figure 3 This is a schematic diagram of the structure of the MIMO 2×3 analog domain channel conduction test equipment provided in the embodiments of this application; Figure 4 This is a second structural schematic diagram of the MIMO 2×2 analog domain channel conduction test device provided in the embodiments of this application; Figure 5 This is a curve showing the relationship between the channel correlation coefficient and the phase difference φ of the MIMO 2×2 communication system provided in this application embodiment; Figure 6 This is a curve showing the relationship between the condition number CN and the phase difference φ in a MIMO 2×2 communication system provided in this application embodiment; Figure 7 This is a first schematic diagram illustrating the CN value adjustment effect of the channel conduction test equipment of the 2×2 communication system channel correlation adjustment device provided in this application embodiment; Figure 8 This is a second schematic diagram illustrating the CN value adjustment effect of the channel conduction test equipment of the 2×2 communication system channel correlation adjustment device provided in this application embodiment; Figure 9 This is a first flowchart illustrating the channel conduction testing method provided in this application embodiment; Figure 10 This is a second flowchart illustrating the channel conduction testing method provided in the embodiments of this application; Figure 11 This is a schematic diagram of the structure of the MIMO 4×4 analog domain channel conduction test device provided in the embodiments of this application; Figure 12 This is a schematic diagram of the structure of the MIMO 3×4 analog domain channel conduction test equipment provided in the embodiments of this application; Figure 13 This is a schematic diagram of the structure of the MIMO 4×3 analog domain channel conduction test device provided in the embodiments of this application; Figure 14 This is a schematic diagram of the structure of the MIMO 5×4 analog domain channel conduction test device provided in the embodiments of this application.

[0012] It should be noted that the terms "first" and "second" mentioned above are only used to distinguish between different options and do not represent the degree of superiority or inferiority of the options or their priority in the implementation process. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings. The described embodiments should not be regarded as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0014] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0015] In the following description, the terms "first, second, third" are used merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first, second, third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0016] Unless otherwise defined, all technical and scientific terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the embodiments of this application is for the purpose of describing the embodiments of this application only and is not intended to limit this application.

[0017] In multiple-in multiple-out (MIMO) communication, channel correlation is a crucial factor affecting communication quality. Stronger channel correlation leads to greater differences in the singular values ​​of the channel matrix, resulting in greater differences in the effective power of different data streams transmitted, ultimately leading to poorer MIMO communication quality and lower throughput.

[0018] Assessing the impact of channel correlation on MIMO communication systems requires determining channel correlation metrics. One approach involves placing the MIMO antenna connected to test equipment in a shielded room, integrating the signals emitted by the receiver and generator with an omnidirectional antenna to calculate the correlation metric and evaluate MIMO antenna performance. Alternatively, the channel response matrix of the transmitted signal pilot data can be obtained, autocorrelation and averaging processes can be performed to obtain the MIMO channel correlation matrix, noise compensation can be applied, and eigenvalue decomposition can be performed on the MIMO channel correlation matrix. The condition number of the MIMO channel correlation matrix can then be calculated using the eigenvalues ​​as the MIMO channel correlation coefficient to evaluate the channel correlation of the MIMO communication system. Finally, the channel correlation of the MIMO communication system can be determined by obtaining the prior and posterior channel capacities and calculating the relative relationship between these two quality parameters.

[0019] While testing MIMO communication system performance in real-world environments is feasible, the process is complex. To more quickly verify the performance of different devices in the same environment, or the same device in different environments, wireless channel simulation devices have been designed. For example, wireless channel simulation methods using combiners and channel simulators are primarily used in simulating communication between devices and base station antennas. Predetermined channel coefficient data are key simulation parameters, typically set based on measured values ​​from a specific environment. Related technologies also use power dividers to split the signal into multiple paths, employing multiple components to convert the signal into a digital signal, performing signal processing in the digital domain, and then using components to convert the digital signal back to the analog signal transmission receiver. This involves numerous components and cumbersome processing. This MIMO wireless channel simulation device is mainly used in laboratories to accurately simulate the propagation characteristics of real wireless channels. While methods for extracting MIMO channel correlation through actual device communication provide accurate correlation indicators, they have significant drawbacks when used to investigate the impact of channel correlation on MIMO devices. In particular, the large number of experimental variables makes it difficult to control variables, resulting in low repeatability and difficulty in cross-sectional comparisons due to varying effects across different devices.

[0020] In related technologies, wireless channel simulators primarily process signals in the digital domain. The simulator modifies the input signal and outputs it to the device under test (DUT) for communication performance testing, based on communication protocol requirements or the client's specific scenario requirements for extracting signal features. Currently, there is a lack of wireless channel simulators designed for independent channel scenarios with specific channel correlations, making it difficult to quantitatively analyze the impact of correlations on MIMO communication. Furthermore, to simulate complex real-world communication scenarios, multiple digital domain signal processing modules are typically used, resulting in high barriers to entry, difficult maintenance, and hindering integration and miniaturization.

[0021] To address the problems existing in related technologies, embodiments of this application provide a channel conduction testing method, a channel conduction testing device, a control device, a computer-readable storage medium, and a computer program product, which can achieve controllable adjustment of the correlation of the output signal while reducing hardware complexity. The exemplary application of the channel conduction testing device provided in the embodiments of this application is described below.

[0022] See Figure 1 , Figure 1 This is a schematic diagram illustrating the application of the communication channel in the MIMO M×N communication system provided in this application embodiment. This application embodiment uses an example where both M and N are 2. Figure 1 This is a schematic diagram of a simulated channel transmission in a conducted test topology. The conducted test system 100 includes a companion device 101, a device under test 102, and a channel matrix 103 disposed between the companion device 101 and the device under test 102.

[0023] The test device 101 is used to output two transmit signals (input signals of the channel conduction test device), with each transmit signal corresponding to one of the two transmit ports Tx1 to Tx2. The device under test 102 is used to receive two receive signals (output signals of the channel conduction test device), with each receive signal corresponding to one of the two receive ports Rx1 to Rx2.

[0024] Channel matrix 103 is used to simulate the MIMO conduction channel between the device under test 101 and the device under test 102. Channel matrix 103 includes 2×2 signal transmission channels between two transmit ports Tx1 to Tx2 and two receive ports Rx1 to Rx2, with each signal transmission channel corresponding to a channel coefficient. ,in, This represents a conducted analog channel between the j-th transmit port Txj and the i-th receive port Rxi, for example: It is a conducted analog channel between the first transmit port Tx1 and the first receive port Rx1.

[0025] Specifically, each transmit port Tx is connected to each receive port Rx, so that each transmit signal can be transmitted to either of the two receive ports; each receive port Rx is used to aggregate the signal components from the two transmit ports Tx. Thus, the channel matrix 103 constitutes a 2×2 multiple-input multiple-output conducted test topology, used to characterize the signal coupling relationship and channel response relationship between the device under test 101 and the device under test 102.

[0026] In some implementations, the channel matrix 103 includes a power divider, a combiner, a phase shifter, and radio frequency (RF) connections. The RF connections are used to connect each device to adjust the amplitude and phase of each conducted analog channel, thereby enabling control of the overall channel correlation.

[0027] The channel conduction test device provided in this application includes: an input distribution layer, a phase shifting circuit, and an output combining layer; the input distribution layer, the phase shifting circuit, and the output combining layer are connected in sequence by radio frequency connection lines.

[0028] The input distribution layer is used to receive M input signals and divide each of the M input signals into N first branch signals, where M and N are positive integers greater than or equal to 2.

[0029] For example, the input distribution layer includes a power divider connected to the transmitter (test equipment). One power divider distributes each input signal equally, forming N first-branch signals, each with equal amplitude. The power divider is used to achieve equal power distribution of the input signals. M and N can be equal, or M can be greater than N, or N can be greater than M. For example, with 2 input signals, each input signal is divided into 3 first-branch signals, forming a total of 6 first-branch signals.

[0030] The phase-shifting circuit is used to perform phase adjustment processing on the N first branch signals corresponding to one of the M input signals to obtain N adjustment signals.

[0031] For example, a phase shifter is used to control all channels at one of the transmit ports of a channel conduction test device, thereby adjusting the channel phase shift difference and thus adjusting the channel correlation and changing the channel correlation of the MIMO communication system.

[0032] See Figure 2 , Figure 2 This is a first structural schematic diagram of the MIMO 2×2 analog domain channel conduction test device provided in the embodiment of this application; the transmit port Tx2 is connected to a power divider, which distributes the input signal equally to form two first branch signals. The two first branch signals corresponding to the transmit port Tx2 are respectively phase-adjusted by phase shifter 1 and phase shifter 2 to obtain the adjusted signal.

[0033] See Figure 3 , Figure 3 This is a schematic diagram of the structure of the MIMO 2×3 analog domain channel conduction test equipment provided in this application embodiment. The transmit port Tx2 is connected to a power divider, which distributes the input signal equally, forming three first branch signals. The three first branch signals corresponding to the transmit port Tx2 are phase-adjusted by phase shifters 1, 2, and 3 to obtain adjusted signals. Compared to the MIMO 2×2 communication system, the MIMO 2×3 communication system expands to three receive ports, adds a set of power dividers for the receive ports, and uses an additional phase shifter. Due to the port expansion, the transmit power divider can use a 1-to-4 power divider for power distribution, with one redundant output connected to a matching load. A redundant output refers to an output port in a multi-port RF device that is not involved in the current signal transmission or test process; a matching load is a load device used to terminate unused ports and absorb incident signal energy (the impedance of the matching load is, for example, 50Ω). Connecting the redundant output to the matching load reduces port reflections and maintains the impedance matching state of the RF network.

[0034] In some embodiments, the phase shifting circuit includes N phase shifters, each of which is disposed in the N channels corresponding to the same transmit port. The phase shifters are used to change the channel correlation of the M×N channels by adjusting the phase of the signal.

[0035] The output synthesis layer is used to synthesize the M-1 first branch signals and 1 adjustment signal corresponding to different input signals to obtain N first output signals.

[0036] In some embodiments, the input distribution layer includes M power dividers, the output combining layer includes N combiners, and the N combiners and the M power dividers form M×N channels, with each combiner corresponding to M channels and each power divider corresponding to N channels. A power divider is used to receive input signals from the transmitter's transmit port and divide the input signals into N first branch signals; The combiner is used to combine the M-1 first branch signals corresponding to different input signals with the 1 adjustment signal into a first output signal, and send the first output signal to the receiving port of the receiver.

[0037] For example, the combiner connects to the receiver's receive port, combining multiple first branch signals with the conditioning signal and outputting them to the receiver, thus achieving multi-channel energy combining. Continuing with the example... Figure 3 Taking this as an example, the receiving port Rx1 is connected to a combiner, which combines the first branch signal (corresponding to channel 1) into a single branch. ) and 1 conditioning signal (corresponding to channel) They are combined into the first output signal.

[0038] In this embodiment, after the power divider splits the signal into multiple paths, only a few of the signals are phase-shifted. The signal is processed in the analog domain. Compared with related technologies, there is no process of converting analog signals to digital signals and then back to analog signals, which improves testing efficiency.

[0039] In some embodiments, when M is less than or equal to N; the phase-shifting circuit is used to perform phase adjustment processing on the N first branch signals corresponding to one of the target input signals in the M input signals to obtain N first adjustment signals; the phase-shifting circuit is also used to perform phase adjustment processing on the first target branch signal in each of the M-2 input signals to obtain M-2 second adjustment signals, wherein the M-2 input signals do not include the target input signal.

[0040] For example, the M-2 input signals do not include the target input signal; that is, each channel contains only one phase shifter, and the phase shifting circuit includes M+N-2 phase shifters. For ease of understanding, the following explanation is provided in conjunction with the accompanying drawings.

[0041] When M equals N, assuming both M and N are 4, refer to... Figure 11 , Figure 11 This is a schematic diagram of the structure of the MIMO 4×4 analog domain channel conduction test device provided in this application embodiment; the MIMO 4×4 analog domain channel conduction test device is used to control the channel correlation of the system by controlling the similarity between the channels connected to two transmit ports (Tx1 and Tx2), and the channel connected to the Tx1 transmit port ( , , , The circuit is used to transmit four first branch signals. Each channel connected to the Tx1 transmitter port has a phase shifter. The four first branch signals corresponding to the Tx2, Tx3, and Tx4 transmitter ports have different phase gradients. The four first branch signals corresponding to the Tx2 transmitter port are directly output to the combiners corresponding to different receiver ports (Rx1, Rx2, Rx3, Rx4). One first target branch signal corresponding to the Tx3 transmitter port is phase-modulated by a phase shifter. The resulting second adjustment signal has a 180° phase difference with other first branch signals and is output to the combiner corresponding to receiver port Rx1 for synthesis. The same applies to the Tx4 transmitter port. Therefore, the phase-shifting circuit contains (4+4-2)=6 phase shifters.

[0042] When M is less than N, assuming M is 3 and N is 4. Figure 12 This is a schematic diagram of the structure of the MIMO 3×4 analog domain channel conduction test device provided in this application embodiment; the MIMO 3×4 analog domain channel conduction test device is used to control the channel correlation of the system by controlling the similarity between the channels connected to two transmit ports (Tx1 and Tx2), and the channel connected to the Tx1 transmit port ( , , , This is used to transmit four first-branch signals. Each channel connected to the Tx1 transmitter port is equipped with a phase shifter. The phase modulation method for these four first-branch signals is not unique; for example, the phases may be 0°, θ, θ, θ. 2. The phase gradients of the four first branch signals corresponding to the Tx2 and Tx3 transmitting ports are different. The four first branch signals corresponding to the Tx2 transmitting port are directly output to the combiners corresponding to different receiving ports (Rx1, Rx2, Rx3, Rx4). The first target branch signal corresponding to the Tx3 transmitting port is phase-modulated by a phase shifter. The resulting second adjustment signal has a 180° phase difference with the other first branch signals. This second adjustment signal is output to the combiner corresponding to the receiving port Rx1 for synthesis. The phase shifting circuit contains (3+4-2) = 5 phase shifters.

[0043] The output synthesis layer is used to perform at least one of the following synthesis processes to obtain N first output signals: synthesizing M-2 first branch signals corresponding to different input signals with 1 first adjustment signal and 1 second adjustment signal to obtain a first output signal; synthesizing M-1 first branch signals corresponding to different input signals with 1 first adjustment signal to obtain a first output signal.

[0044] For example, when M is less than or equal to N, the number of first adjustment signals is N, and the number of second adjustment signals is M-2. In this case, among the N synthesizers in the output synthesis layer, each synthesizer will necessarily receive one first adjustment signal. There are two possibilities: receiving one second adjustment signal or not receiving a second adjustment signal. Therefore, the synthesizer is used to perform at least one of the following synthesis processes: synthesizing the M-2 first branch signals corresponding to different input signals with one first adjustment signal and one second adjustment signal to obtain a first output signal; or synthesizing the M-1 first branch signals corresponding to different input signals with one first adjustment signal to obtain a first output signal.

[0045] In some embodiments, when M is greater than N; the phase shifting circuit is used to perform phase adjustment processing on the second target branch signal in the N first branch signals corresponding to each input signal to obtain the first adjustment signal corresponding to each input signal; The phase-shifting circuit is further used to perform phase adjustment processing on the third target branch signal in each of the N-2 input signals to obtain N-2 second adjustment signals, wherein the third target branch signal is a first branch signal other than the second target branch signal. When M is greater than N, the number of phase shifters in the phase-shifting circuit is M+N-2, the number of first adjustment signals is M, and the number of second adjustment signals is N-2.

[0046] The output synthesis layer is used to perform at least one of the following synthesis processes to obtain N first output signals: Synthesis Processing (1) Combine the first branch signals corresponding to different input signals with at least one first adjustment signal to obtain the first output signal; Synthesis processing (2) combines the first branch signals corresponding to different input signals, at least one first adjustment signal and one second adjustment signal to obtain the first output signal; Synthesis Processing (3) Combines the first branch signals corresponding to different input signals with the second adjustment signal of 1 channel to obtain the first output signal.

[0047] Example, Figure 13 This is a schematic diagram of the structure of the MIMO 4×3 analog domain channel conduction test device provided in this application embodiment. The MIMO 4×3 analog domain channel conduction test device is used to control the channel correlation of the system by controlling the similarity between the channels connected to four transmit ports (Tx1 and Tx2, Tx3, Tx4). The power divider of the Tx1 transmit port is used to output three first branch signals. The channel connected to the Tx1 transmit port (e.g., A phase shifter is provided to adjust the second target branch signal to obtain the first adjustment signal; similarly, one of the channels connected to the Tx2, Tx3, and Tx4 transmit ports (e.g., , , A phase shifter is provided to adjust the second target branch signal to obtain the first adjustment signal. For N-2 channels ( Figure 13 The input signal (channel 1) corresponds to the N-1 channels outside the second target branch signal. Figure 13 In one of the channels corresponding to the first branch signal (of the two paths), a phase shifter is also provided. For example: Figure 13 Transmit port Tx1 and receive port Rx2 channels There is one phase shifter. The phase shifting circuit contains (4+3-2)=5 phase shifters.

[0048] Taking a MIMO 4×3 analog domain channel conduction test device as an example, each phase shifter used to acquire the first modulation signal is set in the first channel corresponding to the power divider (e.g., channel). , , , If each phase shifter used to obtain the second adjustment signal is set in a channel other than the first channel corresponding to the power divider, then the output synthesis layer performs the following synthesis processes: synthesis of 4 first adjustment signals; synthesis of 4 first branch signals; synthesis of 3 first branch signals and 1 second adjustment signal.

[0049] Continue with Figure 13Taking a MIMO 4×3 analog domain channel conduction test device as an example, the method is described below. Each phase shifter used to acquire the first modulation signal is set in the channel. , , , The phase shifter used to acquire the second adjustment signal is set in the channel. Then the output synthesis layer performs the following synthesis process: in the form of synthesis process (1), the first branch signals corresponding to the three different input signals are synthesized with the first adjustment signal of one channel to obtain the first output signal; in the form of synthesis process (2), the first branch signal of one channel, the first adjustment signal of two channels and the second adjustment signal of one channel are synthesized to obtain the first output signal.

[0050] refer to Figure 14 , Figure 14 This is a schematic diagram of the structure of the MIMO 5×4 analog domain channel conduction test equipment provided in an embodiment of this application. Figure 14 Taking a MIMO 5×4 analog domain channel conduction test device as an example, the method is described below. Each phase shifter used to acquire the first modulation signal is set in the channel. , , , , The phase shifter used to acquire the second adjustment signal is set in the channel. , Then the output synthesis layer performs the following synthesis processing: In the form of synthesis processing (1), the first branch signals corresponding to the four different input signals are synthesized with one first adjustment signal to obtain the first output signal of Rx1; In the form of synthesis processing (1), the two first branch signals are synthesized with three first adjustment signals to obtain the first output signal of Rx2. In the form of synthesis processing (2), the three first branch signals, one second adjustment signal, and one first adjustment signal are synthesized to obtain the first output signal of Rx3. In the form of synthesis processing (3), the four first branch signals and one second adjustment signal are synthesized to obtain the first output signal of Rx4.

[0051] In some embodiments, the phase-shifting circuit is further configured to perform phase adjustment processing on the target branch signal in the N first branch signals corresponding to each input signal to obtain the adjustment signal corresponding to each input signal.

[0052] For example, the phase shifter includes a phase shifter control board, which consists of a phase shifter chip and control circuitry. The phase of the RF channel link can be changed by adjusting a switch or by inputting phase shifter control commands, thereby adjusting the channel correlation of the entire channel conduction test equipment.

[0053] In some embodiments, the phase shifting circuit includes M phase shifters, each of which is disposed in the M channels corresponding to the same receiving port. The phase shifters are used to change the channel correlation of the M×N channels by adjusting the phase of the signal.

[0054] For example, a phase shifter is used to control all channels at one of the receiving ports of a channel conduction test device, thereby adjusting the channel phase shift difference and thus adjusting the channel correlation and changing the channel correlation of the MIMO communication system. Figure 4 This is a schematic diagram of the second structure of the MIMO 2×2 analog domain channel conduction test device provided in this application embodiment. A power divider is connected to the transmit port Tx1, which distributes the input signal equally to form two first branch signals. One of the two first branch signals corresponding to the transmit port Tx1 is used as the target branch signal. The target branch signal is phase-adjusted by phase shifter 1 to obtain the adjusted signal. A power divider is also connected to the transmit port Tx2, which distributes the input signal equally to form two first branch signals. One of the two first branch signals corresponding to the transmit port Tx2 is used as the target branch signal. The target branch signal is phase-adjusted by phase shifter 2 to obtain the adjusted signal.

[0055] Figure 7 This is a schematic diagram illustrating the CN value adjustment effect of the 2×2 communication system channel conduction test equipment provided in this application embodiment. By keeping the phase shifter 1 at a fixed phase and adjusting the phase shifter 2 from 0 degrees to 180 degrees, the correlation condition number CN value of the channel conduction test equipment can be adjusted from high to low. If the initial phase difference between the channel connected to the phase shifter and the channel not connected to the phase shifter is not 0, the highest value of CN in the curve of the channel conduction test equipment changing with the phase shifter 2 from 0 degrees to 180 degrees may deviate from the 0° phase point.

[0056] In some embodiments, the overall channel correlation of a MIMO communication system can be controlled by adjusting the phase of two rows (or two columns) of elements in the channel response matrix. One channel can be kept constant while the other channels undergo phase shifts from 0° to 360° to achieve different channel correlations. Alternatively, a phase shifter can be installed in each channel to control the phase of all channels, thus adjusting the channel correlation of the MIMO communication system from its lowest to its highest level.

[0057] The output synthesis layer is also used to synthesize the M-channel adjustment signals to obtain the second output signal; the output synthesis layer is also used to synthesize the first branch signals corresponding to different input signals to obtain the N-1-channel third output signals.

[0058] In some embodiments, the input distribution layer includes M power dividers, the output combining layer includes N combiners, and the N combiners and the M power dividers form M×N channels, with each combiner corresponding to M channels and each power divider corresponding to N channels. A power divider is used to receive input signals from the transmitter's transmit port and divide the input signals into N first branch signals; The combiner is used to combine M modulation signals to obtain a second output signal, and to combine the first branch signals corresponding to different input signals to obtain N-1 third output signals. The second output signal and the N-1 third output signals are then sent to the receiver port of the receiver. In the above case, the phase shifting circuit contains M phase shifters.

[0059] Continue to refer to Figure 4 N is 2 and M is 2. The receiving port Rx1 is connected to a combiner, which combines the two first branch signals (corresponding to the channel) into a single unit. and The two modulated signals (corresponding to the channel) are combined into a single third output signal. The receiver port Rx2 is connected to a combiner, which combines the two modulated signals (corresponding to the channel) into a single output signal. and They are combined into a second output signal.

[0060] In some embodiments, the electrical lengths of all channels from each transmit port to each receive port are equal. To ensure consistent CN value modulation effects of phase adjustment across different frequency bands, the channel RF connection lines of the channel correlation adjustment channel conduction test equipment are designed with equal lengths, ensuring that at least the connection lines connected to the same transmit port are of equal length, or at least the connection lines connected to the same receive port are of equal length.

[0061] Figure 8 This is a schematic diagram of the CN value adjustment effect of the 2×3 communication system channel conduction test equipment provided in the embodiment of this application; when the phase shifter 1 is set to 0° and remains unchanged, the phase shifter 2 is adjusted from 0° to 120°, and the phase shifter 3 is set to twice the phase of the phase shifter 2 and changes from 0° to 240°, the condition number CN value of the channel conduction test equipment changes from high to low.

[0062] In some embodiments of this application, when constructed using independent power dividers, RF connection lines, and phase shifters, the scale of the conducted channel test equipment can be easily expanded according to the actual MIMO test port requirements. By adjusting the phase of all channels connected to one of the transmitters (or receivers), arbitrary connections can be achieved. The channel correlation adjustment of the MIMO communication system was tested, and the communication quality of the system under different channel correlations was evaluated when the maximum communication data flow N was reached. .

[0063] In some embodiments, the channel conduction test equipment can be implemented using separate power dividers, combiners, RF coaxial cables, and phase shifter control boards, which facilitates the expansion of the test scale and the addition of ports; or it can be implemented using power dividers, combiners, RF microstrip or strip traces, and phase shifter chips integrated into printed circuit boards to achieve the integrated design of the channel conduction test equipment and realize the miniaturized application of the channel conduction test equipment.

[0064] In some embodiments, the phase shifting circuit of the channel conduction test equipment can use a phase shifter chip for convenient automated control testing; a continuously adjustable mechanical phase shifter can be used to facilitate continuous adjustment of the phase shift to achieve higher precision correlation control; and an onboard RC phase shifting circuit can be used to reduce cost.

[0065] Compared with related technologies, the channel conduction testing equipment provided in this application has the following advantages: (1) Simple components. Traditional channel simulators require the application of many modules to simulate the performance of transmitting and receiving antennas. They also require signal processing units such as digital-to-analog conversion and baseband processing in the channel simulation part to perform channel simulation. The overall structure is complex, and the configuration parameters also depend on the extraction of real environment, resulting in high setup complexity. The simulated domain channel conduction test device proposed in this application takes advantage of the conduction test and only uses a power divider, combiner, and RF line to realize the MIMO communication channel connection. It uses a phase shifter to adjust part of the channel phase to realize the overall channel correlation control of the channel conduction test device. The circuit of this application embodiment is implemented with only a power divider, RF connection line, and phase shifter chip, which is simple in structure. The power divider and RF connection line can also be integrated on the printed circuit board (PCB) based on PCB technology, which is highly versatile. It can be miniaturized and can be easily electrically connected with any transceiver device to form a miniaturized MIMO conduction performance test topology to verify the communication quality of the device under different correlations. In contrast, the existing channel simulators have complex components, large size, and are not flexible enough during testing.

[0066] (2) Simple operation. Existing channel simulators focus on recreating the actual environment for channel communication simulation. When configuring parameters, they focus on antenna patterns, transmission protocol modes, Doppler effects, etc., and the configuration of channel correlation is very complex. Some instruments adjust the correlation by directly configuring the real and imaginary parts of the channel correlation matrix, which involves a lot of data, a complicated process, and is prone to errors; some instruments determine the channel correlation directly by simulating the relative positions of the transmitting and receiving antennas, which is difficult to adjust and is easily affected by the performance of the applied antenna. The embodiment of this application achieves correlation control by adjusting the phase of all channels connected to one transmitter (or receiver) in the channel conducted test equipment. The adjustment method is simple and has a low threshold for use. By using this channel conducted test equipment, the correlation index corresponding to different shifts of the channel conducted test equipment can be extracted only once. Subsequently, it can be quickly adjusted to the required MIMO communication quality of the correlation test prototype when connected to the conducted topology.

[0067] In some embodiments, this application also provides a channel conduction testing method, see [link to relevant documentation]. Figure 9 , Figure 9 This is a flowchart illustrating the channel conduction testing method provided in this application embodiment. The channel conduction testing method is implemented based on the channel conduction testing equipment of this application embodiment, and the execution entity is the control device provided in this application embodiment, which will be described in detail below.

[0068] In step 901, M input signals are received, and each of the M input signals is divided into N first branch signals.

[0069] In step 902, the N first branch signals corresponding to one of the M input signals are subjected to phase adjustment processing to obtain N adjustment signals.

[0070] For example, when channels equipped with phase shifters correspond to the same transmit port, phase adjustment processing is performed on all N first branch signals corresponding to one of the M input signals to obtain N adjusted signals.

[0071] In step 903, the M-1 first branch signals corresponding to different input signals are combined with the 1 adjustment signal to obtain N first output signals.

[0072] In some embodiments, this application also provides a channel conduction testing method, see [link to relevant documentation]. Figure 10 , Figure 10 This is a flowchart illustrating the channel conduction testing method provided in this application embodiment. The channel conduction testing method is implemented based on the channel conduction testing equipment of this application embodiment, and the execution entity is the control device provided in this application embodiment, which will be described in detail below.

[0073] In step 1001, M input signals are received, and each of the M input signals is divided into N first branch signals.

[0074] In step 1002, the target branch signal in the N first branch signals corresponding to each input signal is subjected to phase adjustment processing to obtain the adjustment signal corresponding to each input signal.

[0075] For example, when the channels equipped with phase shifters correspond to the same receiving port, the target branch signal in the N first branch signals corresponding to each input signal is phase-adjusted to obtain the adjustment signal corresponding to each input signal.

[0076] In step 1003, the M-channel adjustment signals are synthesized to obtain the second output signal, and the first branch signals corresponding to different input signals are synthesized to obtain the N-1-channel third output signal.

[0077] In some embodiments, the condition number of the communication channel capacity is obtained by: analyzing the N first output signals to obtain the channel response matrix; multiplying the channel response matrix by its conjugate transpose to obtain the channel Hermitian matrix; performing eigenvalue decomposition on the channel Hermitian matrix to obtain R real eigenvalues, where R is the minimum of M and N; selecting the maximum and minimum eigenvalues ​​from the R real eigenvalues; and calculating the condition number characterizing the channel correlation based on the ratio of the maximum to the minimum eigenvalue.

[0078] The channel correlation matrix can be obtained by autocorrelation calculation of the channel response matrix H. The channel correlation between two antennas that are both transmitting or both receiving is obtained by selecting elements from the channel correlation matrix that relate to the channels of both antennas and jointly calculating the correlation coefficient. In multi-channel MIMO communication systems, describing channel correlation using the channel correlation matrix is ​​very complex. To investigate the impact of channel correlation on MIMO communication quality, this application's embodiments adjust the channel correlation in conducted tests, eliminating the influence of factors such as antenna pattern performance, spatial delay, and interference in the MIMO communication system. Furthermore, the spatial-temporal stability of the conducted topology ensures that the transmission channel experiences flat fading. Assuming the channel coefficients... Remaining constant, this can be represented by the attenuation and phase shift of the signal transmitted from the receiver output port to the receiving port. Therefore, a... In a MIMO communication system, the signal received by the j-th receiving port of the receiver at time t is... It can then be written as formula (1): (1) in, Let be the signal emitted by the i-th transmitting port of the transmitter at time t. Let be the noise received by the j-th receiving port at time t. Let be the channel coefficient between the i-th transmitting port and the j-th receiving port.

[0079] The channel response matrix H, composed of all channel coefficients, can be expressed as formula (2): (2) If the channel correlation between the two ports of a receiver is obtained in a MIMO 2×2 communication system, the channel correlation coefficient can be calculated using formula (3): (3) in, yes It is a conjugate matrix. The real parts are equal, and the imaginary parts are opposites of each other. Channel coefficients. These are the attenuation and phase shift of the signal transmission path. The corresponding channel coefficients in a MIMO 2×2 communication system can be written in the following form: where... and These represent the signal amplitude attenuation and phase change from the j-th transmitting port to the i-th receiving port, respectively.

[0080] It is the channel coefficient between the first transmit port and the first receive port. , ; and so on, It is the channel coefficient between the second transmit port and the first receive port. , ; It is the first The channel coefficient between the first transmit port and the first receive port; It is the channel coefficient between the first transmit port and the second receive port. ; It is the channel coefficient between the second transmit port and the second receive port. ; It is the first The channel coefficient between the first transmit port and the second receive port; It is from the first transmission port to the... Channel coefficients between each receiving port; It is the second transmission port to the... Channel coefficients between each receiving port; It is the first The first transmission port to the first Channel coefficients between each receiving port; Channel coefficient The amplitude; Channel coefficient The phase; It is with phase The corresponding complex exponential term; Channel coefficient amplitude, Channel coefficient The phase; Channel coefficient amplitude, Channel coefficient The phase; Channel coefficient amplitude, Channel coefficient The phase; Channel coefficient amplitude, Channel coefficient The phase; Channel coefficient amplitude, Channel coefficient The phase; Channel coefficient amplitude, Channel coefficient The phase; Channel coefficient amplitude, Channel coefficient The phase; Channel coefficient amplitude, Channel coefficient The phase; Channel coefficient amplitude, Channel coefficient The phase; It is a natural constant; In complex terms The middle is the imaginary unit, which satisfies .

[0081] Formula (3) can also be derived into the form of formula (4.1).

[0082] (4.1) This can be simplified to the following formula (4.2): (4.2) From formula (4.2), it can be seen that changing the attenuation and phase shift of the transmission channel can change the channel correlation between the two ports of the receiver.

[0083] To study the impact of channel correlation on MIMO communication quality, it is necessary to adjust the channel correlation while minimizing other interferences. Changing the attenuation of the transmission channel alters the signal strength reaching the receiver, making it difficult to control variables in experiments. Therefore, in this embodiment, channel correlation is adjusted in the analog domain by regulating the channel phase. Based on the principle of formula (4.2), when the amplitudes of all channels are equal and remain constant, the channel phase difference... and When changing, The range of variation is from -1 to 1. When The closer to 1, the greater the channel correlation. The closer to 0, the lower the channel correlation. Therefore, as long as a set of channel phase differences remains constant, for example: and The phase difference is 0. The phase is , and The phase difference is Adjust another group and The phase difference varies from 0 to 180°, at which point... This allows the correlation to be adjusted from maximum to minimum by changing from 1 to 0. (See also...) Figure 5 , Figure 5 This is a curve showing the relationship between the channel correlation coefficient and the phase difference φ of the MIMO 2×2 communication system provided in this application embodiment; Figure 5 This indicates that in a MIMO 2×2 communication system, the channel amplitude remains the same. hour and The relationship curve.

[0084] If extended to higher dimensions In a MIMO communication system, the phase difference of all channels involved in the two ports of the receiver is controlled, thereby controlling the channel correlation of the entire communication system. Formula (4.2) is transformed into formula (5): (5) As the number of transmitter and receiver ports in MIMO communication increases, describing the channel correlation of the entire communication system using channel coefficients between ports becomes complex and unintuitive. Considering that the channel correlation of a MIMO communication system is characterized in a conducted test topology, and that the channel cross-correlation is independent of the performance of the transmit and receive antennas, singular value decomposition can be performed on the channel response matrix H. The matrix condition number CN, calculated from the maximum and minimum singular values, can then be used as the MIMO channel correlation coefficient. (See also...) Figure 6 , Figure 6This is a curve showing the relationship between the condition number CN and the phase difference φ of the MIMO 2×2 communication system provided in this application embodiment.

[0085] Communication systems typically characterize channel correlation using the autocorrelation matrix R, calculated from the channel response matrix H. The autocorrelation matrix consists of channel autocorrelation or cross-correlation coefficients. The dimension of the autocorrelation matrix R of a MIMO communication system is The number of coefficients is large. Considering the channel response matrix... Its conjugate transpose product It is a Hermitian matrix. When the transmitter does not contain communication channel information and all antennas have the same transmission power, the Hermitian matrix... eigenvalues It is used to characterize the effective transmission power gain of the channel for each data stream. The rank R of the matrix is ​​the number of non-zero eigenvalues, i.e., the number of different data streams transmitted by the channel. When the represented... When the communication system transmits its highest data stream, that is... When the rank is full, the number of non-zero eigenvalues ​​R is equal to and The smaller value in, based on Calculate the condition number CN.

[0086] The condition number CN is the ratio of the largest singular value to the smallest singular value of a matrix. Singular Value Decomposition (SVD) is a concept in linear algebra that decomposes a matrix into the product of three matrices. For a 4x4 square matrix... Its singular value decomposition can be expressed as: ,in, It is orthogonal matrix (i.e. ). It is A diagonal matrix whose diagonal elements are singular values ,and . It is orthogonal matrix (i.e. Singular values By calculating the matrix The singular values ​​are obtained from the eigenvalues ​​of the matrix. Specifically, singular values ​​are the eigenvalues ​​of the matrix. or The square root of the eigenvalues. Assume... eigenvalues So, singular values It can be represented as: , yes eigenvalues.

[0087] Example, calculation The steps for calculating singular values ​​are as follows: This can be expressed as the following formula (6.1): (6.1) Example, The Line 1 The column elements can be uniformly written as the following formula (6.2): (6.2) Solve eigenvalues And calculate singular values. This is achieved by: processing the matrix Construct the characteristic equation The matrix is ​​obtained by solving the characteristic equation. eigenvalues Furthermore, a matrix is ​​obtained based on the eigenvalues. The singular values ​​are determined, and the condition number CN is calculated based on the maximum and minimum singular values. The characteristic equation is constructed as follows (6.3): (6.3) Represents a determinant; It is an eigenvalue variable; It is a 4th-order identity matrix, represented as ,Will After substituting, we get the following formula (6.4): (6.4) Expanding the above determinant, we can obtain the following about The quartic characteristic polynomial (6.5): (6.5) Solving for the four roots of the quartic equation yields the eigenvalues: Among the four eigenvalues Maximum eigenvalue With the smallest eigenvalue of the matrix The ratio of the maximum effective transmission power gain to the minimum effective transmission power gain in the transmission of R data streams can be used to characterize the ratio of the maximum effective transmission power gain to the minimum effective transmission power gain.

[0088] When strong channel correlation occurs in the transmission channel, the effective power of at least one data stream will decrease. At this time, the transmission quality of this data stream will decrease, the communication throughput will decrease, and the condition number CN of the channel response matrix will increase due to the decrease in the denominator (minimum effective transmission power gain). The larger the condition number CN value, the more ill-conditioned the channel matrix, the stronger the channel correlation, the worse the MIMO communication quality, and the lower the throughput. Since the condition number CN quantifies the impact of channel correlation on MIMO communication transmission, the condition number CN can be used as an indicator to measure the channel correlation of the MIMO communication system, expressed as the following formula (7): (7) As the number of transceiver ports increases and the specifications of MIMO communication systems become more sophisticated, the method of adjusting the channel correlation of the entire communication system by constructing a channel matrix with correlation between the channel coefficients of two rows (or columns) becomes complex. In this embodiment, M channel matrix elements are selected from an M×M channel matrix with identical amplitudes, and their phases are synchronously adjusted to achieve channel correlation adjustment of the communication system. The row and column numbers of the M channel matrix elements are all different.

[0089] For example, in a MIMO 2×2 communication system, to maintain consistent attenuation amplitude across all channels, ,at this time The relationship between phase difference and correlation coefficient of MIMO communication system is shown in Figure 8 , Figure 8 This is a second schematic diagram illustrating the CN value control effect of the channel conduction test equipment of the 2×2 communication system channel correlation adjustment device provided in the embodiments of this application. Figure 8 This demonstrates how a MIMO 2×2 communication system maintains the same channel amplitude. Time condition number CN and The relationship curve. The larger the CN value, the stronger the channel correlation, the more ill-conditioned the channel matrix, the worse the MIMO communication quality, and the worse the throughput performance.

[0090] In this embodiment, the overall channel correlation of the MIMO communication system is controlled by adjusting the phase of two rows (or two columns) of elements in the channel response matrix. One channel is kept constant, while other channels undergo phase shifts from 0° to 360° to achieve different channel correlations. Alternatively, a phase shifter can be set in each channel to control the phase of all channels, allowing the phase difference between different terms in the numerator to range from the same to the maximum difference, thus adjusting the channel correlation of the MIMO communication system from the lowest to the highest. By simulating a MIMO wireless channel through a combination of conductive elements, the channel correlation of the MIMO communication system is controlled by dynamically adjusting the phase of specific channels. Communication equipment tested using this channel conduction testing equipment can quantify the impact of different channel correlations on communication quality.

[0091] This application provides a computer program product, which includes a computer program or computer-executable instructions stored in a computer-readable storage medium. The processor of an electronic device reads the computer-executable instructions from the computer-readable storage medium and executes the computer-executable instructions, causing the electronic device to perform the channel conduction testing method described above in this application.

[0092] This application provides a computer-readable storage medium storing computer-executable instructions or a computer program. When the computer-executable instructions or the computer program are executed by a processor, the processor will execute the channel conduction testing method provided in this application, for example... Figure 9 The channel conduction test method is shown.

[0093] In some embodiments, the computer-readable storage medium may be a memory such as RAM, ROM, flash memory, magnetic surface memory, optical disk, or CD-ROM; or it may be a variety of devices including one or any combination of the above-mentioned memories.

[0094] In some embodiments, computer-executable instructions may take the form of programs, software, software modules, scripts, or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as stand-alone programs or as modules, components, subroutines, or other units suitable for use in a computing environment.

[0095] As an example, computer-executable instructions can be deployed to execute on a single electronic device, or on multiple electronic devices located at one location, or on multiple electronic devices distributed across multiple locations and interconnected via a communication network.

[0096] In summary, this embodiment of the application divides each of the M input signals into N first branch signals, and synthesizes the M-1 first branch signals corresponding to different input signals with one phase-adjusted signal to obtain N first output signals, thereby realizing the combined mapping between the M input signals and the N first output signals. Since the phase adjustment process acts on the N first branch signals corresponding to one input signal, the phase contribution of that input signal in each output signal can be controlled, thus enabling the adjustment of the synthesized result of the N first output signals. Compared to adjusting multiple input signals separately, this method changes the correlation characteristics between output signals while maintaining a relatively consistent amplitude across the branch signals, thereby controlling the correlation of the MIMO channel and reducing the number of phase adjustment devices and the complexity of the device implementation.

[0097] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, and improvements made within the spirit and scope of this application are included within the scope of protection of this application.

Claims

1. A channel conduction testing device, characterized in that, include: Input distribution layer, phase shifting circuit, and output combining layer; The input allocation layer is used to receive M input signals and divide each of the M input signals into N first branch signals, wherein M and N are positive integers greater than or equal to 2; The phase-shifting circuit is used to perform phase adjustment processing on the N first branch signals corresponding to one of the M input signals to obtain N adjustment signals. The output synthesis layer is used to synthesize the M-1 first branch signals corresponding to different input signals and the 1 adjustment signal to obtain N first output signals.

2. The device according to claim 1, characterized in that, The input distribution layer includes M power dividers, and the output combining layer includes N combiners. The N combiners and the M power dividers form M×N channels, with each combiner corresponding to M channels and each power divider corresponding to N channels. The power divider is used to receive the input signal from the transmitter's transmit port and divide the input signal into N first branch signals; The combiner is used to combine the M-1 first branch signals corresponding to different input signals with the 1 adjustment signal to form the first output signal, and send the first output signal to the receiving port of the receiver. The phase shifting circuit includes N phase shifters, each of which is respectively set in the N channels corresponding to the same transmit port. The phase shifters are used to change the channel correlation of the M×N channels by adjusting the phase of the signal.

3. The device according to claim 1, characterized in that, When M is less than or equal to N; The phase-shifting circuit is also used to perform phase adjustment processing on the N-channel first branch signal corresponding to one of the target input signals in the M-channel input signals to obtain the N-channel first adjustment signal; The phase-shifting circuit is further used to perform phase adjustment processing on the first target branch signal in each of the M-2 input signals to obtain the second adjustment signal of the M-2 channels, wherein the M-2 input signals do not include the target input signal, and the phase-shifting circuit includes M+N-2 phase shifters; The output synthesis layer is also used to perform at least one of the following synthesis processes to obtain N first output signals: The first output signal is obtained by combining the M-2 first branch signals corresponding to different input signals with the first adjustment signal and the second adjustment signal. The first output signal is obtained by combining the M-1 first branch signals corresponding to different input signals with the first adjustment signal of the 1st channel.

4. The device according to claim 1, characterized in that, When M is greater than N; The phase-shifting circuit is also used to perform phase adjustment processing on the second target branch signal in the N first branch signals corresponding to each input signal to obtain the first adjustment signal corresponding to each input signal; The phase-shifting circuit is also used to perform phase adjustment processing on the third target branch signal in each of the N-2 input signals to obtain N-2 second adjustment signals, wherein the third target branch signal is a first branch signal other than the second target branch signal, and the phase-shifting circuit includes M+N-2 phase shifters; The output synthesis layer is also used to perform at least one of the following synthesis processes to obtain N first output signals: The first branch signals corresponding to different input signals are combined with at least one of the first adjustment signals to obtain the first output signal; The first output signal is obtained by combining the first branch signal corresponding to different input signals, at least one first adjustment signal and one second adjustment signal; The first branch signal corresponding to different input signals is combined with the second adjustment signal of channel 1 to obtain the first output signal.

5. The device according to claim 1, characterized in that, The phase-shifting circuit is further used to perform phase adjustment processing on the second target branch signal in the N first branch signals corresponding to each input signal to obtain the adjustment signal corresponding to each input signal, wherein the phase-shifting circuit includes M phase shifters; The output synthesis layer is also used to synthesize the M-channel adjustment signals to obtain a second output signal; The output synthesis layer is also used to synthesize the first branch signals corresponding to different input signals to obtain N-1 third output signals.

6. The device according to claim 5, characterized in that, The input distribution layer includes M power dividers, and the output combining layer includes N combiners. The N combiners and the M power dividers form M×N channels, with each combiner corresponding to M channels and each power divider corresponding to N channels. The power divider is used to receive the input signal from the transmitter's transmit port and divide the input signal into N first branch signals; The combiner is used to synthesize M-channel adjustment signals to obtain a second output signal, and to synthesize the first branch signals corresponding to different input signals to obtain N-1-channel third output signals, and to send the second output signal and the N-1-channel third output signals to the receiving port of the receiver.

7. A channel conduction testing method, characterized in that, The method is implemented based on the channel conduction test equipment according to any one of claims 1 to 6, and the method includes: Receive M input signals and divide each of the M input signals into N first branch signals; Phase adjustment processing is performed on the N first branch signals corresponding to one of the M input signals to obtain N adjustment signals; The M-1 first branch signals corresponding to different input signals are combined with the 1-channel adjustment signal to obtain N first output signals.

8. The method according to claim 7, characterized in that, The method further includes: The channel response matrix is ​​obtained by analyzing the N first output signals; Multiplying the channel response matrix by its conjugate transpose yields the channel Hermitian matrix. The channel Hermitian matrix is ​​decomposed into eigenvalues ​​to obtain R real eigenvalues, where R is the minimum value among M and N; Select the largest and smallest eigenvalues ​​from the N real eigenvalues; The condition number characterizing channel correlation is calculated based on the ratio of the maximum eigenvalue to the minimum eigenvalue.

9. A control device, characterized in that, The control device includes: Memory is used to store executable instructions or computer programs. A processor is configured to execute computer-executable instructions or computer programs stored in the memory to control a signal source to apply an input signal to the channel conduction test device according to any one of claims 1 to 6, adjust the parameters of the channel conduction test device, and read the output signal of the channel conduction test device, so as to implement the channel conduction test method according to any one of claims 7 to 8.

10. A computer-readable storage medium storing computer-executable instructions or a computer program, characterized in that, When the computer-executable instructions or computer program are executed by a processor, the channel conduction test method according to any one of claims 7 to 8 is implemented.

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