Method and system for detecting emission modulation performance of point-to-point communication equipment

Abstract

The invention provides a method and a system for detecting emission modulation performance of point-to-point communication equipment. The method comprises the following steps that: the point-to-point communication equipment to be detected emits a D2D (Device-to-Device) signal; the signal receiving and processing module demodulates and detects the D2D signal; wherein the signal receiving and processing module comprises a first signal receiving module and a first baseband processing module of the point-to-point communication equipment to be tested, or comprises a gold machine; the gold machine is confirmed to-be-detected point-to-point communication equipment capable of normally receiving and detecting the D2D signal. According to the invention, the cost of emission modulation performance detection of the point-to-point communication equipment can be reduced.

Description

Technical Field

[0001] This invention relates to the field of device-to-device (D2D) communication technology, and in particular to a method and system for detecting the transmission modulation performance of a device-to-device communication device. Background Technology

[0002] Before communication equipment is mass-produced and shipped, its transmission and reception performance needs to be tested to ensure that the transmission and reception performance of the communication equipment put into use is qualified.

[0003] For common terminal-base station communication equipment, the standard typically used is 4G, 5G, BT, or WiFi. When testing the transceiver performance of this type of communication equipment on the production line, the production line instruments will develop corresponding transmission signal demodulation modules according to the protocol standards to measure the terminal's transmission modulation performance.

[0004] However, point-to-point communication devices typically use proprietary protocol communication modules, meaning there is no unified protocol standard. This prevents conventional production line instruments from directly measuring the transmission and modulation performance of point-to-point communication devices. Testing the transmission and modulation performance of point-to-point communication devices requires powerful instruments, such as signal analysis instruments, but these are expensive and generally not considered for use in production processes.

[0005] Therefore, how to reduce the cost of transmitting modulation performance testing for point-to-point communication equipment, especially how to reduce the cost of transmitting modulation performance testing for point-to-point communication equipment on the production line, has become an urgent problem to be solved. Summary of the Invention

[0006] To address the aforementioned issues, the present invention provides a method and system for detecting the transmission modulation performance of point-to-point communication devices. This method and system detect the transmission modulation performance of the point-to-point communication device under test using the device itself or a testing machine, thereby reducing the testing cost of the device.

[0007] In a first aspect, the present invention provides a method for detecting the transmission modulation performance of a point-to-point communication device, the method comprising:

[0008] The point-to-point communication device under test transmits D2D signals;

[0009] The signal receiving and processing module demodulates and detects the D2D signal;

[0010] The signal receiving and processing module includes a first signal receiving module and a first baseband processing module of the point-to-point communication device under test, or includes a gold-plated device; the gold-plated device is a point-to-point communication device under test that has been confirmed to be able to normally receive and detect D2D signals.

[0011] Optionally, when the signal receiving and processing module includes a first signal receiving module and a first baseband processing module, the method further includes the following steps before the point-to-point communication device under test transmits the D2D signal:

[0012] The signal transmitting instrument sends a D2D verification signal to the first signal receiving module;

[0013] The first signal receiving module sends the received D2D verification signal to the first baseband processing module;

[0014] The first baseband processing module demodulates and detects the D2D test signal to determine whether the first signal receiving module is working properly.

[0015] Optionally, the first baseband processing module demodulates and detects the D2D inspection signal, including the following steps:

[0016] The first baseband processing module demodulates the D2D detection signal to obtain test indicators, which include at least one of the following: signal-to-noise ratio, received signal strength indication, packet error rate, and bit error probability.

[0017] The first baseband processing module compares the test index with the corresponding first discrimination threshold;

[0018] When the first baseband processing module determines that the first signal receiving module is malfunctioning, at least one of the test indicators exceeds the corresponding first discrimination threshold.

[0019] The first baseband processing module determines that the first signal receiving module is working normally when all test indicators do not exceed the corresponding first discrimination threshold.

[0020] Optionally, the steps for the point-to-point communication device under test to transmit D2D signals include:

[0021] When the first baseband processing module determines that the first signal receiving module is working properly, the point-to-point communication device under test transmits a D2D signal.

[0022] Optionally, the gold-plated device includes a second signal receiving module and a second baseband processing module;

[0023] When the signal receiving and processing module includes a metal detector, the method further includes the following steps before the step of transmitting a D2D signal by the point-to-point communication device under test:

[0024] The machine switches the second signal receiving module and the second base processing module to the on state.

[0025] Optionally, when the signal receiving and processing module includes a second signal receiving module and a second baseband processing module, the method further includes:

[0026] The second signal receiving module couples the D2D signal to the metal receiver and sends the coupled D2D signal to the second baseband processing module.

[0027] Optionally, when the signal receiving and processing module includes a second signal receiving module and a second baseband processing module, the method further includes:

[0028] The second signal receiving module acquires the D2D signal through an attenuator and sends the acquired D2D signal to the second baseband processing module.

[0029] Optionally, the signal receiving and processing module demodulates and detects the D2D signal, including the following steps:

[0030] The first baseband processing module or the second baseband processing module demodulates the D2D detection signal to obtain test indicators, which include at least one of the following: signal-to-noise ratio, received signal strength indication, packet error rate, and bit error probability.

[0031] The first baseband processing module or the second baseband processing module compares the test index with the corresponding second discrimination threshold;

[0032] If the first baseband processing module or the second baseband processing module exceeds the corresponding second discrimination threshold in at least one of the test indicators, the transmission modulation performance of the point-to-point communication device under test is determined to be abnormal.

[0033] If the first baseband processing module or the second baseband processing module determines that the transmission modulation performance of the point-to-point communication device under test is normal when all test indicators do not exceed the corresponding second discrimination threshold.

[0034] In a second aspect, the present invention provides a detection system for the transmission modulation performance of a point-to-point communication device, the system comprising a self-test coupler and a point-to-point communication device under test;

[0035] The point-to-point communication device under test includes: an antenna, a signal receiving module, a signal transmitting module, and a baseband processing module;

[0036] One end of the self-test coupler and the output of the signal transmitting module are both connected to the antenna, the other end of the self-test coupler is connected to the input of the signal transmitting module, and the output of the signal transmitting module is connected to the baseband processing module.

[0037] The self-test coupler couples the D2D signal output from the signal transmitting module to the signal receiving module. The signal receiving module then sends the D2D signal to the baseband processing module, which demodulates and tests the D2D signal.

[0038] Optionally, the detection system may also include: a signal transmitting instrument;

[0039] The signal transmitting instrument is connected to the antenna and is used to send D2D test signals to the antenna;

[0040] The self-test coupler sends the D2D test signal received by the antenna to the signal receiving module, which then sends the D2D test signal to the baseband processing module. The baseband processing module demodulates and detects the D2D test signal.

[0041] Thirdly, the present invention provides a detection system for the transmission modulation performance of a point-to-point communication device, the system comprising a signal attenuation module, a metal detector, and the point-to-point communication device under test;

[0042] The point-to-point communication device under test includes: antenna, signal transceiver, and baseband processing module;

[0043] One end of the signal transceiver is connected to the antenna, and the other end of the signal transceiver is connected to the baseband processing module;

[0044] The gold device is a confirmed point-to-point communication device that can normally receive and detect D2D signals;

[0045] One end of the signal attenuation module is connected to the antenna on the point-to-point communication device under test, and the other end of the signal attenuation module is connected to the antenna on the metal device. The signal attenuation module includes an attenuator or a coupler.

[0046] The method and system for detecting the transmission modulation performance of point-to-point communication devices provided in this invention can detect the transmission modulation performance of the point-to-point communication device under test by the device itself or by a testing instrument, without considering the communication protocol. This solves the problem that the transmission modulation performance of point-to-point communication devices cannot be demodulated and tested on existing low-cost instruments, thus reducing the testing cost of the point-to-point communication device under test. It is particularly suitable for testing point-to-point communication devices under test on production lines. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic flowchart illustrating a method for detecting the transmission modulation performance of a point-to-point communication device according to an embodiment of this application;

[0049] Figure 2 This is a schematic flowchart illustrating a method for detecting the transmission modulation performance of a point-to-point communication device according to an embodiment of this application;

[0050] Figure 3 This is a schematic structural diagram of a detection system for the transmission modulation performance of a point-to-point communication device according to an embodiment of this application.

[0051] Figure 4 This is a schematic structural diagram of a detection system for the transmission modulation performance of a point-to-point communication device according to an embodiment of this application. Detailed Implementation

[0052] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0054] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element present. Conversely, when an element is said to be "directly on" another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0055] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0056] Example 1

[0057] This embodiment provides a method for detecting the transmission modulation performance of a point-to-point communication device. See [link to relevant documentation]. Figure 1 The method includes steps S101 to S102.

[0058] Step S101: The point-to-point communication device under test transmits a D2D (point-to-point communication technology) signal.

[0059] Step S102: The signal receiving and processing module demodulates and detects the D2D signal.

[0060] The signal receiving and processing module includes a first signal receiving module and a first baseband processing module for the point-to-point communication device under test.

[0061] In a further optional embodiment of this example, before the step of the point-to-point communication device under test transmitting the D2D signal, the method further includes:

[0062] The signal transmitting instrument sends a D2D test signal to the first signal receiving module; the first signal receiving module sends the received D2D test signal to the first baseband processing module; the first baseband processing module demodulates and detects the D2D test signal to determine whether the first signal receiving module is working properly.

[0063] By verifying the working status of the first signal receiving module using the D2D test signal, misjudgments of the transmission modulation performance of the point-to-point communication device under test can be avoided due to the performance failure of the first signal receiving module.

[0064] In a further optional embodiment of this embodiment, the step of the first baseband processing module demodulating and detecting the D2D inspection signal includes:

[0065] The first baseband processing module demodulates the D2D detection signal to obtain test indicators, which include, but are not limited to, at least one of the following: signal-to-noise ratio (SNR), received signal strength indication (RSSI, used to characterize the power of the transmitted signal), packet error rate (PER), and bit error probability (BER). The first baseband processing module compares the test indicators with corresponding first discrimination thresholds. If at least one of the test indicators exceeds the corresponding first discrimination threshold, the first baseband processing module determines that the first signal receiving module is malfunctioning. If none of the test indicators exceed the corresponding first discrimination threshold, the first baseband processing module determines that the first signal receiving module is functioning normally.

[0066] In this embodiment, the test indicators include, but are not limited to, signal-to-noise ratio, received signal strength indication, packet error rate, and bit error probability.

[0067] Understandably, during the process of the first baseband processing module inspecting the D2D detection signal, each inspection index will be compared with the corresponding first discrimination threshold. If any inspection index exceeds the corresponding first discrimination threshold, the performance of the first signal receiving module is determined to be abnormal. At this time, the test of the point-to-point communication device under test can be terminated, or other equipment can be used to retest the transmission modulation performance of the point-to-point communication device under test, such as using a gold-plated instrument to retest the transmission modulation performance of the point-to-point communication device under test.

[0068] In this embodiment, if the first baseband processing module determines that the performance of the first signal receiving module is abnormal, the test of the point-to-point communication device under test will be terminated.

[0069] Furthermore, the steps for the point-to-point communication device under test to transmit D2D signals include: the point-to-point communication device under test transmits D2D signals when the first baseband processing module determines that the first signal receiving module is working normally.

[0070] In a further optional embodiment of this embodiment, the step of demodulating and detecting the D2D signal by the signal receiving and processing module includes:

[0071] The first baseband processing module demodulates the D2D detection signal to obtain test indicators, which include, but are not limited to, at least one of the following: signal-to-noise ratio, received signal strength indication, packet error rate, and bit error probability.

[0072] The first baseband processing module compares the test indicators with the corresponding second discrimination threshold;

[0073] When the first baseband processing module determines that the transmission modulation performance of the point-to-point communication device under test is abnormal if at least one of the test indicators exceeds the corresponding second discrimination threshold;

[0074] The first baseband processing module determines that the transmission modulation performance of the point-to-point communication device under test is normal when all test indicators do not exceed the corresponding second discrimination threshold.

[0075] In this embodiment, the test metrics include, but are not limited to, signal-to-noise ratio, received signal strength indication, packet error rate, and bit error probability.

[0076] Understandably, during the process of the first baseband processing module testing the D2D signal, each test index will be compared with the corresponding second discrimination threshold. If any test index exceeds the corresponding second discrimination threshold, the transmission modulation performance of the point-to-point communication device under test will be determined to be abnormal.

[0077] The method for detecting the transmission modulation performance of point-to-point communication devices provided in this embodiment utilizes the receiving link and baseband processing module of the point-to-point communication device under test to complete the detection of its transmission modulation performance. This eliminates the need to consider communication protocols, solving the problem that the transmission modulation performance of point-to-point communication devices cannot be demodulated and tested on existing low-cost instruments, thus reducing the detection cost of the point-to-point communication device under test. It is particularly suitable for testing point-to-point communication devices under test on production lines.

[0078] Example 2

[0079] This embodiment provides a method for detecting the transmission modulation performance of a point-to-point communication device. See [link to relevant documentation]. Figure 2 The method includes steps S201 to S202.

[0080] Step S201: The point-to-point communication device under test transmits a D2D signal.

[0081] Step S202: The Golden device demodulates and detects the D2D signal.

[0082] Among them, the gold machine is a confirmed point-to-point communication device that can normally receive and detect D2D signals.

[0083] Understandably, the difference between the gold receiver and the point-to-point communication device under test is that the receiving link on the gold receiver is working properly, while it is unknown whether the receiving link on the point-to-point communication device under test is working properly.

[0084] Furthermore, the gold-plated device includes a second signal receiving module and a second baseband processing module. Prior to the step of the point-to-point communication device under test transmitting the D2D signal, the method further includes:

[0085] The gold receiver switches the second signal receiving module and the second base processing module to the ON state, meaning the gold receiver selects to open the receiving link via a selector. The receiving link of the gold receiver includes the second receiving module.

[0086] Specifically, the receiver can connect either the transmit link or the receive link to the antenna via a selector. When the receiver connects the transmit link to the antenna via the selector, the second baseband processing module can transmit signals externally through the transmit link and the antenna. When the receiver connects the receive link to the antenna via the selector, the second baseband processing module can receive external signals through the receive link and the antenna.

[0087] In a further optional embodiment of this embodiment, the method further includes: the second signal receiving module couples the D2D signal to the gold machine through a coupler, and sends the coupled D2D signal to the second baseband processing module.

[0088] By coupling the D2D signal to the gold receiver using a coupler, the signal received by the gold receiver can be effectively attenuated, thereby preventing the second signal receiving module from saturating.

[0089] In a further optional embodiment of this embodiment, the method further includes: the second signal receiving module acquires the D2D signal through an attenuator and sends the acquired D2D signal to the second baseband processing module.

[0090] By coupling the D2D signal to the gold receiver using an attenuator, the signal received by the gold receiver can be effectively attenuated, thereby preventing the second signal receiving module from saturating.

[0091] In a further optional embodiment of this embodiment, the step of demodulating and detecting the D2D signal by the signal receiving and processing module includes:

[0092] The second baseband processing module demodulates the D2D detection signal to obtain test indicators, which include, but are not limited to, at least one of the following: signal-to-noise ratio, received signal strength indication, packet error rate, and bit error probability.

[0093] The second baseband processing module compares the test indicators with the corresponding second discrimination threshold;

[0094] When the second baseband processing module determines that the transmission modulation performance of the point-to-point communication device under test is abnormal when at least one of the test indicators exceeds the corresponding second discrimination threshold;

[0095] The second baseband processing module determines that the transmission modulation performance of the point-to-point communication device under test is normal when all test indicators do not exceed the corresponding second discrimination threshold.

[0096] In this embodiment, the test metrics include, but are not limited to, signal-to-noise ratio, received signal strength indication, packet error rate, and bit error probability.

[0097] Understandably, during the process of the second baseband processing module testing the D2D signal, each test index will be compared with the corresponding second discrimination threshold. If any test index exceeds the corresponding second discrimination threshold, the transmission modulation performance of the point-to-point communication device under test will be determined to be abnormal.

[0098] The method for testing the transmission modulation performance of point-to-point communication devices provided in this embodiment utilizes the gold-plated receiver link and baseband processing module to complete the testing of the transmission modulation performance of the point-to-point communication devices under test. This eliminates the need to consider communication protocol issues, solving the problem that the transmission modulation performance of point-to-point communication devices cannot be demodulated and tested on existing low-cost instruments, thus reducing the testing cost of the point-to-point communication devices under test. It is particularly suitable for testing point-to-point communication devices under test on production lines.

[0099] Example 3

[0100] This embodiment provides a system for detecting the transmission modulation performance of a point-to-point communication device, and the method in Embodiment 1 is applied to this system. See also Figure 3 The system includes a self-test coupler 41 (CPL, coupler) and a point-to-point communication device under test 1.

[0101] The point-to-point communication device under test 1 includes: antenna 31, signal transceiver 33, and baseband processing module 34.

[0102] The transceiver 33 includes a transmit link and a receive link. The two ends of the transmit link are electrically connected to the antenna 31 and the baseband processing module 34, respectively, and the two ends of the receive link are also electrically connected to the antenna 31 and the baseband processing module 34, respectively. The transmit link includes a signal transmitting module 331, and the receive link includes a signal receiving module 332. The signal receiving module 332 transmits the received D2D signal to the baseband processing module 34, which demodulates and detects the D2D signal.

[0103] One end of the self-test coupler 41 and the output end of the signal transmitting module 331 are both connected to the antenna 31. The other end of the self-test coupler 41 is connected to the input end of the signal transmitting module 331, and the output end of the signal transmitting module 331 is connected to the baseband processing module 34.

[0104] The self-test coupler 41 couples the D2D signal output by the signal transmitting module 331 to the signal receiving module 332. The signal receiving module 332 sends the D2D signal to the baseband processing module 34, which demodulates and tests the D2D signal.

[0105] Furthermore, the point-to-point communication device under test 1 also includes a radio frequency front-end module 32 (RFFE). The radio frequency front-end module 32 includes functional devices such as a power amplifier (PA), but is not limited thereto. One end of the antenna 31 is electrically connected to one end of the self-test coupler 41, the other end of the self-test coupler 41 is electrically connected to one end of the power amplifier, and the other end of the power amplifier is electrically connected to the signal transmitting module 331 in the signal transceiver 33.

[0106] In this embodiment, the other end of the power amplifier is electrically connected to the signal transmitting module 331. The signal transmitting module 331 is used to convert the digital signal provided by the baseband processing module 34 into a module analog signal, and to perform up-conversion processing on the converted analog signal to obtain an up-converted signal. The up-converted signal is sent as a D2D signal to the antenna 31 module via the radio frequency front-end module 32. The signal receiving module 332 is used to perform down-conversion processing on the D2D signal received through the coupler to obtain a down-converted signal, and then convert the down-converted signal into a digital signal through an analog-to-digital converter so that the baseband processing module 34 can demodulate and detect the digital signal.

[0107] In a further optional embodiment of this embodiment, the detection system further includes a signal transmitting instrument.

[0108] The signal transmitting instrument is communicatively connected to antenna 31 and is used to send D2D test signals to antenna 31. Self-test coupler 41 sends the D2D test signals received by antenna 31 to signal receiving module 332. Signal receiving module 332 sends the D2D test signals to baseband processing module 34. Baseband processing module 34 demodulates and detects the D2D test signals.

[0109] Specifically, the signal receiving module 332 is used to down-convert the D2D test signal received through the coupler to obtain a down-converted signal, and then convert the down-converted signal into a digital signal through an analog-to-digital converter so that the baseband processing module 34 can demodulate and detect the digital signal.

[0110] Example 4

[0111] This embodiment provides a system for detecting the transmission modulation performance of a point-to-point communication device, and the method in Embodiment 2 is applied to this system. See also Figure 4 The system includes a signal attenuation module 42, a metal detector 2, and a point-to-point communication device 1 to be tested. The signal attenuation module 42 is an attenuator or a coupler.

[0112] It is understood that the internal structure of the point-to-point communication device 1 and the gold machine 2 in this embodiment is the same as that of the point-to-point communication device 1 in embodiment 3, and will not be described in detail here.

[0113] In this embodiment, one end of the signal attenuation module 42 is connected to the antenna 31 on the point-to-point communication device 1 under test, and the other end of the signal attenuation module 42 is connected to the antenna 31 on the metal device 2.

[0114] The signal receiving module 332 on the gold machine 2 is used to perform down-conversion and analog-to-digital conversion on the received D2D signal and then send it to the baseband processing module 34 on the gold machine 2 so that the second baseband processing module 34 on the gold machine 2 can demodulate and detect the D2D signal.

[0115] It should be noted that in this embodiment, only the receiving link on the gold device 2 is used to test the transmission modulation performance of the point-to-point communication device 1 under test. That is, the receiving link on the gold device 2 has been confirmed in the laboratory to be able to receive signals normally. As for the transmission link on the gold device 2, that is, whether the signal transmission module 331 on the gold device 2 has been confirmed to be able to transmit signals normally, this embodiment does not make specific limitations.

[0116] In an alternative embodiment, the transmission link on the gold machine 2 has also been confirmed in the laboratory to be able to transmit signals normally.

[0117] In the description of this specification, the references to terms such as "some embodiments," "other embodiments," "ideal embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiments or examples.

[0118] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0119] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method of detecting the transmission modulation performance of a point-to-point communication device, characterized by, The method comprises: The to-be-tested point-to-point communication device transmits a D2D signal; The signal receiving and processing module demodulates and detects the D2D signal; The signal receiving and processing module comprises a first signal receiving module and a first baseband processing module of the to-be-tested point-to-point communication device, or comprises a golden machine; the golden machine is a to-be-tested point-to-point communication device that has been confirmed to be able to normally receive and detect the D2D signal.

2. The method of claim 1, wherein, When the signal receiving and processing module comprises the first signal receiving module and the first baseband processing module, before the step of transmitting the D2D signal by the to-be-tested point-to-point communication device, the method further comprises: The signal transmitting instrument sends a D2D test signal to the first signal receiving module; The first signal receiving module sends the received D2D test signal to the first baseband processing module; The first baseband processing module demodulates and detects the D2D test signal to determine whether the first signal receiving module is working normally.

3. The method of claim 2, wherein, The step of demodulating and detecting the D2D test signal by the first baseband processing module comprises: The first baseband processing module demodulates the D2D test signal to obtain test indexes, the test indexes comprising at least one of the following: signal-to-noise ratio, received signal strength indication, packet error rate and bit error probability; The first baseband processing module compares the test indexes with corresponding first discrimination thresholds; When at least one of the test indexes exceeds the corresponding first discrimination threshold, the first baseband processing module determines that the first signal receiving module is not working normally; When all the test indexes do not exceed the corresponding first discrimination thresholds, the first baseband processing module determines that the first signal receiving module is working normally.

4. The method of claim 3, wherein, The step of transmitting the D2D signal by the to-be-tested point-to-point communication device comprises: The to-be-tested point-to-point communication device transmits the D2D signal when the first baseband processing module determines that the first signal receiving module is working normally.

5. The method of claim 1, wherein, The golden machine comprises a second signal receiving module and a second baseband processing module; When the signal receiving and processing module comprises the golden machine, before the step of transmitting the D2D signal by the to-be-tested point-to-point communication device, the method further comprises: The golden machine turns on the second signal receiving module and the second baseband processing module.

6. The method of claim 5, wherein, When the signal receiving and processing module comprises the second signal receiving module and the second baseband processing module, the method further comprises: The second signal receiving module couples the D2D signal to the golden machine and sends the coupled D2D signal to the second baseband processing module.

7. The method of claim 5, wherein, When the signal receiving and processing module comprises the second signal receiving module and the second baseband processing module, the method further comprises: The second signal receiving module obtains the D2D signal through an attenuator and sends the obtained D2D signal to the second baseband processing module.

8. The method according to any one of claims 1 to 7, characterized in that, The step of demodulating and detecting the D2D signal by the signal receiving and processing module comprises: The first baseband processing module or the second baseband processing module demodulates the D2D detection signal to obtain a test index, the test index including at least one of a signal-to-noise ratio, a received signal strength indication, a packet error rate, and a bit error probability; The first baseband processing module or the second baseband processing module compares the test index with a corresponding second discrimination threshold; The first baseband processing module or the second baseband processing module determines that the transmission modulation performance of the to-be-tested point-to-point communication device is abnormal when at least one of the test indexes exceeds the corresponding second discrimination threshold; The first baseband processing module or the second baseband processing module determines that the transmission modulation performance of the to-be-tested point-to-point communication device is normal when all of the test indexes do not exceed the corresponding second discrimination threshold.

9. A system for detecting the transmission modulation performance of a point-to-point communication device, characterized by The system includes a self-check coupler and a to-be-tested point-to-point communication device; The to-be-tested point-to-point communication device includes an antenna, a signal receiving module, a signal transmitting module, and a baseband processing module; One end of the self-check coupler and an output end of the signal transmitting module are connected to the antenna, and the other end of the self-check coupler is connected to an input end of the signal transmitting module, and an output end of the signal transmitting module is connected to the baseband processing module; The self-check coupler couples the D2D signal output by the signal transmitting module to the signal receiving module, the signal receiving module sends the D2D signal to the baseband processing module, and the baseband processing module demodulates and tests the D2D signal.

10. The detection system of claim 9, wherein, The detection system further includes a signal transmitting instrument; The signal transmitting instrument is in communication connection with the antenna and is configured to send a D2D detection signal to the antenna; The self-check coupler sends the D2D detection signal received by the antenna to the signal receiving module, the signal receiving module sends the D2D detection signal to the baseband processing module, and the baseband processing module demodulates and detects the D2D detection signal.

11. A system for detecting the transmission modulation performance of a point-to-point communication device, characterized by The system includes a signal attenuation module, a golden machine, and a to-be-tested point-to-point communication device; The to-be-tested point-to-point communication device includes an antenna, a signal transceiver, and a baseband processing module; One end of the signal transceiver is connected to the antenna, and the other end of the signal transceiver is connected to the baseband processing module; The golden machine is a to-be-tested point-to-point communication device that has been confirmed to be able to normally receive and detect the D2D signal; One end of the signal attenuation module is connected to the antenna on the to-be-tested point-to-point communication device, and the other end of the signal attenuation module is connected to the antenna on the golden machine, and the signal attenuation module includes an attenuator or a coupler.

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