WO2022267823A1

WO2022267823A1 - Detection method and suppression method for local oscillator leakage signal, and terminal and storage medium

Info

Publication number: WO2022267823A1
Application number: PCT/CN2022/095668
Authority: WO
Inventors: 史嘉; 王巨震; 段渊博; 王珊; 韦兆碧
Original assignee: 中兴通讯股份有限公司
Priority date: 2021-06-22
Filing date: 2022-05-27
Publication date: 2022-12-29
Also published as: CN115514433A

Abstract

A detection method and suppression method for a local oscillator leakage signal, and a terminal and a storage medium. The detection method for a local oscillator leakage signal is applied to a second AOU end and comprises: receiving a first radio-frequency signal that is sent by a first AOU end (S101); adjusting a radio frequency of a second radio-frequency signal of a second AOU end, so as to make the frequency difference between the adjusted second radio-frequency signal and the first radio-frequency signal be greater than a first preset threshold (S102); and if the frequency difference is greater than the first preset threshold, performing local oscillator leakage signal detection on the first radio-frequency signal (S103).

Description

Local oscillator leakage signal detection method, suppression method, terminal and storage medium

Cross References to Related Applications

This application is based on a Chinese patent application with application number 202110694694.3 and a filing date of June 22, 2021, and claims the priority of this Chinese patent application. The entire content of this Chinese patent application is hereby incorporated by reference into this application.

technical field

The embodiments of the present application relate to the field of communication technologies, and in particular to a detection method, a suppression method, a terminal, and a storage medium for a local oscillator leakage signal.

Background technique

With the demand for large-capacity development of 5G communication technology, for microwave backhaul, the transmission capacity requirements of microwave AOU (All Outdoor Unit) models are also getting higher and higher. The traditional method of improving the signal-to-noise ratio (such as changing the modulation methods, etc.) are far from meeting the requirements. Adopting the zero-IF scheme can improve the transmission bandwidth and the transmission capacity. In addition, the zero-IF scheme can save the IF local oscillator source circuit, IF mixer and IF SAW (surface Acoustic wave, surface acoustic wave) filter circuits, etc., reduce the complexity and number of components of the transmitter system, and greatly reduce the system volume, weight, power consumption and cost. These requirements and advantages have led to the zero-IF in the new generation of AOU models Wide application of the program.

However, the biggest disadvantage of the zero-IF scheme is that due to the imbalance of the amplitude and phase of the quadrature modulation signal and the quadrature local oscillator signal, as well as the sensitivity to DC offset, it leads to serious local oscillator leakage. Therefore, it is necessary to suppress useless local oscillator leakage signals. The key to zero-IF solutions.

An effective premise for local oscillator leakage signal suppression is that the local oscillator leakage signal of the AOU at the opposite end can be detected or identified at the local end. However, the existing local oscillator leakage signal suppression schemes have misjudgment under temperature changes, resulting in bit errors or link breaks, and cannot effectively detect or identify local oscillator leakage signals.

Contents of the invention

Embodiments of the present application provide a detection method, a suppression method, a terminal, and a medium for a zero-IF local oscillator leakage signal.

In the first aspect, the embodiment of the present application provides a detection method of a local oscillator leakage signal, which is applied to the second AOU end, and the detection method includes: receiving the first radio frequency signal sent by the first AOU end; adjusting the second The radio frequency of the second radio frequency signal at the AOU end, so that the adjusted frequency difference between the second radio frequency signal and the first radio frequency signal is greater than a first preset threshold; and when the frequency difference is greater than the first radio frequency signal In the case of a preset threshold, the detection of the local oscillator leakage signal is performed on the first radio frequency signal.

In the second aspect, an embodiment of the present application provides a method for suppressing local oscillator leakage signals. Based on the detection method described in the first aspect of the present application, the suppression method includes: when there is local oscillator leakage in the first radio frequency signal, calculating the MSE of the second AOU terminal; and when the MSE is smaller than a second preset threshold, sending a feedback signal to the first AOU terminal, so that the first AOU terminal adjusts the co-directional quadrature signal Superimposed DC component value.

In the third aspect, the embodiment of the present application provides a detection method of a local oscillator leakage signal, which is applied to the first AOU end, and the detection method includes: sending a first radio frequency signal to the second AOU end, so that the second AOU end The AOU terminal adjusts the radio frequency frequency of the second radio frequency signal at the second AOU terminal, so that the adjusted frequency difference between the second radio frequency signal and the first radio frequency signal is greater than a first preset threshold, and the The second AOU end detects a local oscillator leakage signal on the first radio frequency signal when the frequency difference is greater than the first preset threshold.

In the fourth aspect, the embodiment of the present application provides a method for suppressing local oscillator leakage signals. Based on the detection method described in the third aspect of the application, the suppression method includes: when receiving the feedback sent by the second AOU terminal signal, and adjust the DC component value superimposed on the quadrature signal in the same direction according to the feedback signal, wherein the feedback signal is determined by the second AOU terminal after identifying the local oscillator leakage of the first radio frequency signal according to the A comparison result between the MSE of the second radio frequency signal and a second preset threshold is generated.

In a fifth aspect, the embodiment of the present application provides a terminal, including: a first signal receiving unit, configured to receive a first radio frequency signal sent by a first AOU end; a first frequency adjustment unit, configured to adjust a first radio frequency signal sent by a second AOU end. the radio frequency of the two radio frequency signals, so that the adjusted frequency difference between the second radio frequency signal and the first radio frequency signal is greater than a first preset threshold; and the first leak detection unit is configured to operate at the frequency When the difference is greater than the first preset threshold, the local oscillator leakage signal is detected on the first radio frequency signal.

In a sixth aspect, the embodiment of the present application provides a terminal, including: a second signal sending unit, configured to send a first radio frequency signal to a second AOU end, so that the second AOU end adjusts the The radio frequency of the second radio frequency signal is such that the adjusted frequency difference between the second radio frequency signal and the first radio frequency signal is greater than a first preset threshold, and the second AOU terminal is at the frequency When the difference is greater than the first preset threshold, the local oscillator leakage signal is detected on the first radio frequency signal.

In a seventh aspect, an embodiment of the present application provides a terminal, including: a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein, when the processor executes the computer program, the following is implemented: The above-mentioned detection method of the zero-IF local oscillator leakage signal and/or the suppression method of the above-mentioned zero-IF local oscillator leakage signal.

In the eighth aspect, the embodiment of the present application provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are used to perform the detection method of the zero-IF local oscillator leakage signal as described above and/or as described above. The method for suppressing the leakage signal of the zero intermediate frequency local oscillator mentioned above.

The embodiment of the present application includes: the embodiment of the present application actively adjusts the radio frequency of the radio frequency signal of the local end, and actively manufactures a frequency difference that meets the requirements, so that the frequency difference between the radio frequency signal of the local end and the radio frequency signal of the receiving end is always greater than the threshold value, Therefore, the local end can accurately detect the leakage of the local oscillator in the radio frequency signal of the opposite end, and avoid misjudgment. In addition, compared with the existing solutions, the embodiment of the present application does not need to collect data on IQ offset at high and low temperatures, saving a lot of manpower, resources and time; it can also monitor in real time, using the final MSE index of point-to-point communication as the judgment standard.

Additional features and advantages of the application will be set forth in the description which follows, and, in part, will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solution of the present application, and constitute a part of the specification, and are used together with the embodiments of the present application to explain the technical solution of the present application, and do not constitute a limitation to the technical solution of the present application.

FIG. 1 is a schematic diagram of the architecture of a zero-IF local oscillator leakage signal detection system provided by an embodiment of the present application;

2 is a schematic flow diagram of a detection method for a zero-IF local oscillator leakage signal applied to a second AOU end provided by an embodiment of the present application;

FIG. 3 is a schematic flowchart of a method for suppressing a zero-IF local oscillator leakage signal applied to a second AOU end provided by an embodiment of the present application;

4 is a schematic flow diagram of a detection method for a zero-IF local oscillator leakage signal applied to the first AOU end provided by an embodiment of the present application;

FIG. 5 is a schematic flowchart of a method for suppressing a zero-IF local oscillator leakage signal applied to the first AOU end provided by an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a terminal provided by an embodiment of the present application;

FIG. 7 is a schematic structural diagram of a terminal provided by another embodiment of the present application;

FIG. 8 is a schematic structural diagram of a terminal provided by another embodiment of the present application;

FIG. 9 is a schematic structural diagram of a terminal provided by another embodiment of the present application;

FIG. 10 is a flow chart of an OTA solution provided by an embodiment of the present application; and

FIG. 11 is a flowchart of a method for suppressing a zero-IF local oscillator leakage signal provided by an embodiment of the present application.

detailed description

In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, not to limit the present application.

It should be noted that although the functional modules are divided in the schematic diagram of the device, and the logical sequence is shown in the flowchart, in some cases, it can be executed in a different order than the module division in the device or the flowchart in the flowchart. steps shown or described. The terms "first", "second", etc. in the specification, claims or the above drawings are used to distinguish similar objects, and not necessarily used to describe a specific order or sequence.

With reference to Fig. 1, the first embodiment of the present application provides the detection system of the zero intermediate frequency local oscillator leakage signal that is used to carry out the detection method of zero intermediate frequency local oscillator leakage signal, and system comprises two AOU complete machines, namely AOU1 complete machine ( The steps in this embodiment are represented by the first AOU terminal) and the whole machine of AOU2 (the steps in this embodiment are represented by the second AOU terminal), and the signals of the whole machine are bidirectionally transmitted. The RF transmitting unit of AOU1/AOU2 will transmit the RF signal to the opposite end. There is local oscillator signal leakage in this signal, which is also the node where technical problems occur.

Assume that the whole machine of AOU1 transmits a radio frequency signal, and after the whole machine of AOU2 receives the signal, it identifies it through the RX terminal of AOU2. If the RX terminal recognizes that the radio frequency signal has local oscillator leakage, it can perform the operation of suppressing the leakage of the local oscillator signal. However, if it is not identified, AOU2 will assume that the local oscillator leakage signal of AOU1 has been effectively suppressed, so a misjudgment will occur, and the operation of suppressing local oscillator signal leakage will not be performed, which will cause bit errors on the link. In severe cases, the link will be broken directly. Therefore, the effective prerequisite for local oscillator leakage signal suppression is that the local oscillator leakage signal of the peer AOU can be detected or identified at the local end. In a theoretical scenario, the frequency of the local oscillator leakage signal The local oscillator LO signal of the machine is the same frequency, but there is actually a frequency difference X. This X is the key for the AOU2 machine to identify the local oscillator leakage signal of the AOU1 machine. Once the two have the same frequency or the frequency difference is less than a certain range X, then The above misjudgment will occur, because the two complete machines do not share a reference, so the frequency difference X of the two complete machines changes with the temperature, that is, the frequency difference X at normal temperature may meet the requirements, but as the temperature changes , due to the LO frequency drift characteristic of the local oscillator, the frequency difference X is easy to fail to meet the requirements, resulting in misjudgment, bit error or link disconnection.

In order to solve this problem, referring to FIG. 2, the system of this embodiment can implement a detection method for performing a zero-IF local oscillator leakage signal, including the following steps:

Step S101, the second AOU end receives the first radio frequency signal sent by the first AOU end.

Step S102 , the second AOU end adjusts the radio frequency of the second radio frequency signal at the second AOU end, so that the adjusted frequency difference between the second radio frequency signal and the first radio frequency signal is greater than a first preset threshold.

Step S103 , in the case that the frequency difference is greater than the first preset threshold, the second AOU end detects a local oscillator leakage signal on the first radio frequency signal.

In the above-mentioned steps, the second AOU end receives the first radio frequency signal, and there is a local oscillator signal leakage in the signal (in this field, it cannot be completely avoided, and the local oscillator signal leakage can only be suppressed as much as possible), the second AOU end needs Check the signal. Before performing the detection, actively adjust the radio frequency of the second radio frequency signal at the second AOU terminal, so that the frequency difference between the adjusted radio frequency signal and the first radio frequency signal will exceed

The first preset threshold, so that in the case of temperature changes, the frequency difference between the two signals will always be greater than the first preset threshold, that is, the same frequency or the frequency difference between the two signals will not occur within a certain range X. Finally, the second AOU end detects the local oscillator leakage signal on the first radio frequency signal. It should be noted that: in the case of different AOU models, the value of the first preset threshold will be different. For example, the choice of the AOU model is usually 500Hz, but this embodiment does not limit it. It should also be noted that: as shown in FIG. 10 , the detection of local oscillator leakage signals at the AOU end is well known to those skilled in the art, and will not be described in detail here.

In this embodiment, by actively adjusting the radio frequency of the radio frequency signal at the local end, the frequency difference that meets the requirements is actively produced, so that the frequency difference between the radio frequency signal at the local end and the radio frequency signal at the receiving end is always greater than the threshold, thereby avoiding misjudgment.

As shown in Figure 11, as an optional implementation, the main way for the second AOU to adjust the radio frequency of the second radio frequency signal at the second AOU is to adjust the radio frequency of the second radio frequency signal at the radio frequency receiving end of the second AOU. Frequency moves the set frequency value. Usually, the second AOU end configures the register through software, and then moves the radio frequency of the second radio frequency signal to a set frequency value through the configuration register. This design is realized by software, without any modification of hardware, and the cost is low.

Based on the above-mentioned implementation mode, the steps are also included:

In step S104, the second AOU performs spectrum restoration on the radio frequency of the second radio frequency signal before the baseband demodulation process.

Because the RF frequency of the second RF signal has been shifted in step S102, the spectrum needs to be shifted and restored. For example, if A is shifted, A needs to be restored to ensure normal demodulation of the second AOU signal.

Referring to Fig. 3, the second embodiment of the present application provides a method for suppressing a zero-IF local oscillator leakage signal, comprising the following steps:

Step S105, when the first radio frequency signal has local oscillator leakage, the second AOU end calculates the MSE of the second AOU end.

Step S106 , when the MSE is smaller than the second preset threshold, the second AOU terminal sends a feedback signal to the first AOU terminal, so that the first AOU terminal adjusts the DC component value superimposed on the quadrature signal in the same direction.

In steps S105 and S106, at first, if the second AOU end recognizes that there is a local oscillator leakage in the first radio frequency signal, then after the second AOU end performs baseband demodulation, calculate the MSE (Mean Square Error, Chinese: average root square error) performance, when the MSE of the local end meets the requirements (that is, not less than the second preset threshold), it can be considered that the local oscillator leakage signal at the first AOU end is within the controllable range, no processing is required, and the second AOU end can operate normally. When the MSE of the local end does not meet the requirements (that is, less than the second preset threshold), the second AOU end sends a feedback signal to the first AOU end, and the purpose of sending this signal is to make the first AOU end adjust the corresponding baseband signal, It is used to suppress the local oscillator leakage at the first AOU end. In this embodiment, the second preset threshold can also be referred to as the demodulation threshold. Of course, the demodulation threshold is different for different AUO models or in different scenarios. cognition, which will not be elaborated here. After the first AOU end receives the feedback signal sent by the second AOU end, it will adjust the DC component value (abbreviated as IQ offset value) superimposed on the co-directional quadrature signal of the baseband unit at the first AOU end, wherein the co-directional quadrature The DC component value superimposed on the signal is automatically adjusted by the baseband unit, which is realized by controlling the DAC by the CPU to change the output voltage value.

This embodiment has the following technical effects:

1) Compared with the existing discrete parameter scheme (acquisition and storage of DC bias data at high and low temperature), this method does not need to collect data for IQ offset at high and low temperature, saving a lot of manpower, resources and time.

2) This method can be monitored in real time, and the final MSE index of the point-to-point communication is used as the judgment standard.

3) This method can effectively solve the problems of misjudgment and failure.

Referring to Fig. 4, the third embodiment of the present application provides a detection method of a zero-IF local oscillator leakage signal, comprising the following steps:

Step S201, the first AOU terminal sends the first radio frequency signal to the second AOU terminal, so that the second AOU terminal adjusts the radio frequency frequency of the second radio frequency signal at the second AOU terminal, so that the adjusted second radio frequency signal is consistent with the first radio frequency signal The frequency difference between them is greater than the first preset threshold, and the second AOU end detects the local oscillator leakage signal on the first radio frequency signal when the frequency difference is greater than the first preset threshold.

For the principle part, please refer to the first embodiment, which will not be repeated here. In this embodiment, by actively adjusting the RF frequency of the RF signal at the local end, a frequency difference that meets the requirements is actively produced, so that the RF signal at the local end and the RF signal at the receiving end The frequency difference between them is always greater than the threshold, so as to avoid misjudgment.

Referring to FIG. 5, based on the third embodiment, the fourth embodiment of the present application provides a method for suppressing a zero-IF local oscillator leakage signal, including the following steps:

Step S202, when the first AOU terminal receives the feedback signal sent by the second AOU terminal, adjust the DC component value superimposed on the quadrature signal in the same direction according to the feedback signal, wherein the feedback signal is identified by the second AOU terminal after the first The radio frequency signal is generated according to a comparison result between the MSE of the second radio frequency signal and a second preset threshold after local oscillator leakage exists.

For the principle part, please refer to the second embodiment, which will not be repeated here. This embodiment has the following technical effects:

3) This method can effectively solve the problems of misjudgment and failure.

Referring to FIG. 6 , a fifth embodiment of the present application provides a terminal, including: a first signal receiving unit, a first frequency adjusting unit, and a first leakage detecting unit.

a first signal receiving unit, configured to receive a first radio frequency signal sent by the first AOU;

The first frequency adjustment unit is configured to adjust the radio frequency of the second radio frequency signal at the second AOU end, so that the frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than the first preset threshold;

The first leakage detection unit is configured to detect a local oscillator leakage signal on the first radio frequency signal when the frequency difference is greater than a first preset threshold.

It should be noted that since the terminal in this embodiment has the same technical principle and the same beneficial effect as the method in the first embodiment, in order to avoid duplication of content, details are not repeated here.

Wherein, the first frequency adjustment unit is specifically configured to: move the radio frequency of the second radio frequency signal by a set frequency value through the configuration register.

As an optional implementation manner, it also includes a first frequency restoration unit, and the first frequency restoration unit is configured to detect the mobile Restoring the spectrum of the second radio frequency signal with the set frequency value.

Referring to FIG. 7 , based on the fifth embodiment, the sixth embodiment of the present application provides a terminal, which further includes: a first MSE calculation unit and a first signal sending unit.

The first MSE calculation unit is used to calculate the MSE of the second AOU terminal when the first radio frequency signal has local oscillator leakage;

The first signal sending unit is configured to send a feedback signal to the first AOU terminal when the MSE is less than the second preset threshold, so that the first AOU terminal adjusts the DC component value superimposed on the quadrature signal in the same direction.

It should be noted that since the terminal in this embodiment has the same technical principle and the same beneficial effect as the method in the second embodiment, in order to avoid duplication of content, details are not repeated here.

Referring to FIG. 8 , the seventh embodiment of the present application provides a terminal, including: a second signal sending unit, the second signal sending unit is configured to send a first radio frequency signal to a second AOU end, so that the second AOU The terminal adjusts the radio frequency of the second radio frequency signal at the second AOU terminal, so that the frequency difference between the adjusted second radio frequency signal and the first radio frequency signal is greater than the first preset threshold, and the second AOU terminal is at the frequency difference greater than In the case of the first preset threshold, the local oscillator leakage signal is detected on the first radio frequency signal.

It should be noted that since the terminal in this embodiment has the same technical principle and the same beneficial effect as the method in the third embodiment, in order to avoid duplication of content, details are not repeated here.

Referring to FIG. 9 , based on the seventh embodiment, the eighth embodiment of the present application provides a terminal, further including: a second signal receiving unit. The second signal receiving unit is configured to adjust the DC component value superimposed on the quadrature signal in the same direction according to the feedback signal when receiving the feedback signal sent by the second AOU terminal, wherein the feedback signal is identified by the second AOU terminal after identifying the DC component value After a radio frequency signal has local oscillator leakage, it is generated according to a comparison result between the MSE of the second radio frequency signal and a second preset threshold.

It should be noted that since the terminal in this embodiment has the same technical principle and the same beneficial effect as the method in the fourth embodiment, in order to avoid duplication of content, details are not repeated here.

Referring to Figure 10 and Figure 11, the ninth embodiment of the present application provides a zero-IF local oscillator leakage signal suppression system, this system implements a zero-IF local oscillator leakage signal suppression method, this system mainly includes two AOU complete machine, namely AOU1 complete machine and AOU2 complete machine, wherein AOU1 complete machine includes at least AOU1 radio frequency transmitting unit; AOU1 radio frequency receiving unit; AOU1 baseband transmitting unit; AOU1 baseband receiving unit. AOU2 complete machine at least includes AOU2 radio frequency transmitting unit; AOU2 radio frequency receiving unit; AOU2 baseband transmitting unit; AOU2 baseband receiving unit.

The functions of each unit are as follows:

AOU1/AOU2 RF transmitter unit: The local oscillator signal leaks from this unit, and this is the node where the problem occurs.

AOU1/AOU2 radio frequency receiving unit: used to realize frequency offset-A at the radio frequency end, and the magnitude of the offset A is related to the stability of the selected frequency source.

AOU1/AOU2 baseband transmitter unit: The DC component value superimposed on the co-direction quadrature signal is automatically adjusted by the baseband transmitter unit, and the output voltage value is changed by controlling the DAC by the CPU.

AOU1/AOU2 baseband receiving unit: baseband demodulation, the final performance MSE acquisition position, used to realize the reverse compensation recovery +A of frequency offset at the baseband end before baseband demodulation, so that the frequency offset scheme does not affect the final baseband demodulation performance.

As shown in Figure 10: After the two AOU complete machines form a single hop according to the actual application and work normally, the local oscillator leakage signal of AOU1 will be transmitted to the receiving end of AOU2 through free space, and will be amplified by the radio frequency end at AOU2 and then transmitted to The baseband unit, after baseband detection, recognizes the local oscillator leakage signal of AOU1, and then after baseband demodulation, it will get the MSE of the whole machine of AOU2. If the MSE does not meet the requirements, AOU2 will notify the baseband unit of AOU1 to adjust the co-directional quadrature signal The superimposed DC component value is used to reduce the magnitude of the local oscillator leakage signal of AOU1, and whether the MSE of AOU2 is optimal is used as the criterion for judging the suppression effect of the local oscillator leakage signal at the opposite end.

However, the effective premise of the solution in Figure 10 is that the local oscillator leakage signal of AOU1 must be detected or recognized at the AOU2 end. The DC component value superimposed on the quadrature signal will be misjudged at this time, resulting in the AOU1 local oscillator leakage signal not being effectively suppressed, the link will generate bit errors, and in severe cases, the link will be directly broken.

Theoretically, the frequency of AOU1 LO leakage signal received by AOU2 and the LO signal of AOU2 receiving end are the same frequency, but there is actually a frequency difference X, which is the key for AOU2 to identify the AOU1 LO leakage signal. If the frequency or frequency difference is less than a certain range X, then the above misjudgment will occur, because the two complete machines do not share a reference, so the frequency difference X of the two complete machines changes with the temperature, that is, the frequency difference at room temperature X may meet the requirements, but as the temperature changes, due to the frequency drift characteristics of the local oscillator LO, the frequency difference X may easily fail to meet the requirements, resulting in misjudgment, bit errors or link disconnection.

Since the signal of the whole machine is transmitted bidirectionally, the same problem also exists in the other direction.

As shown in Figure 11, this embodiment innovatively shifts the received RF local oscillator LO signal by a certain frequency-A through software configuration at the receiving end, and staggers the frequency of the TX local oscillator leakage signal at the opposite end to artificially create a frequency difference that meets the requirements. Then enter the baseband unit to identify the TX local oscillator leakage signal of the opposite end, and trigger the large closed-loop to trigger the opposite end baseband unit to adjust the DC component value superimposed on the quadrature signal in the same direction. Before entering the baseband demodulation, the spectrum is +A The transfer recovery of the TX local oscillator will not affect the demodulation judgment, and the MSE can still be used to judge the suppression effect of the TX local oscillator leakage signal.

The tenth embodiment of the present application provides a terminal, and the terminal includes: a memory, a processor, and a computer program stored in the memory and operable on the processor.

The processor and memory can be connected by a bus or other means.

As a non-transitory computer-readable storage medium, memory can be used to store non-transitory software programs and non-transitory computer-executable programs. In addition, the memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage devices. In some embodiments, the memory optionally includes memory located remotely from the processor, and these remote memories may be connected to the processor via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

It should be noted that the terminal in this embodiment can be applied, for example, to the AOU1 complete machine or the AOU2 complete machine in the embodiment shown in FIG. 1 , and the terminal in this embodiment can constitute the system architecture in the embodiment shown in FIG. 1 These embodiments all belong to the same inventive concept, so these embodiments have the same implementation principle and technical effect, and will not be described in detail here.

The non-transitory software programs and instructions required to realize the information processing method of the above-mentioned embodiment are stored in the memory, and when executed by the processor, the information processing method in the above-mentioned embodiment is executed, for example, the above-described execution in FIG. 2 Method steps S101 to S103 , method steps S101 to S106 in FIG. 3 , method steps S201 in FIG. 4 , and method steps S201 to S202 in FIG. 5 .

The terminal embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, that is, they may be located in one place, or may be distributed to multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, the eleventh embodiment of the present application provides a computer-readable storage medium, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are executed by a processor or a controller, for example, Executed by a processor in the above-mentioned terminal embodiment, it can make the above-mentioned processor execute the information processing method in the above-mentioned embodiment, for example, execute the method steps S101 to S103 in FIG. 2 and the method step S101 in FIG. 3 described above to S106 , the method step S201 in FIG. 4 , and the method steps S201 to S202 in FIG. 5 .

In the embodiment of the present application, by actively adjusting the radio frequency of the radio frequency signal at the local end, actively creating a frequency difference that meets the requirements, so that the frequency difference between the radio frequency signal at the local end and the radio frequency signal at the opposite end is always greater than the threshold, so that the local end can accurately Detect local oscillator leakage in the radio frequency signal of the opposite end to avoid misjudgment. In addition, compared with the existing solutions, the embodiment of the present application does not need to collect data on IQ offset at high and low temperatures, saving a lot of manpower, resources and time; it can also monitor in real time, using the final MSE index of point-to-point communication as the judgment standard.

Those skilled in the art can understand that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware and an appropriate combination thereof. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit . Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As known to those of ordinary skill in the art, the term computer storage media includes both volatile and nonvolatile media implemented in any method or technology for storage of information, such as computer readable instructions, data structures, program modules, or other data. permanent, removable and non-removable media. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cartridges, tape, magnetic disk storage or other magnetic storage devices, or can Any other medium used to store desired information and which can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media .

The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above-mentioned implementation, and those skilled in the art can also make various equivalent deformations or replacements without violating the sharing conditions of the spirit of the present application. These equivalent modifications or replacements are all within the scope defined by the claims of the present application.

Claims

A detection method of a local oscillator leakage signal, applied to a second AOU end, the detection method comprising:

receiving a first radio frequency signal sent by the first AOU end;

Adjusting the radio frequency of the second radio frequency signal at the second AOU end, so that the adjusted frequency difference between the second radio frequency signal and the first radio frequency signal is greater than a first preset threshold; and

When the frequency difference is greater than the first preset threshold, a local oscillator leakage signal is detected on the first radio frequency signal.
The detection method according to claim 1, wherein said adjusting the radio frequency of the second radio frequency signal at the second AOU terminal comprises:

At the radio frequency receiving end of the second AOU end, adjust the radio frequency frequency of the second radio frequency signal to move a set frequency value.
According to the detection method according to claim 1 or 2, after the detection of the local oscillator leakage signal on the first radio frequency signal, the detection method further comprises:

Before the baseband demodulation process, performing spectrum restoration on the radio frequency of the second radio frequency signal.
A suppression method for local oscillator leakage signals, based on the detection method according to any one of claims 1 to 3, the suppression method comprising:

When there is local oscillator leakage in the first radio frequency signal, calculate the MSE of the second AOU terminal; and

When the MSE is smaller than the second preset threshold, a feedback signal is sent to the first AOU terminal, so that the first AOU terminal adjusts a DC component value superimposed on the quadrature signal in the same direction.
A detection method of a local oscillator leakage signal, applied to the first AOU end, the detection method comprising:

Sending the first radio frequency signal to the second AOU end, so that the second AOU end adjusts the radio frequency frequency of the second radio frequency signal at the second AOU end, so that the adjusted second radio frequency signal is consistent with the first radio frequency The frequency difference between the signals is greater than a first preset threshold, and the second AOU terminal performs local oscillator leakage on the first radio frequency signal when the frequency difference is greater than the first preset threshold signal detection.
A suppression method of a local oscillator leakage signal, based on the detection method according to claim 5, the suppression method comprising:

When receiving the feedback signal sent by the second AOU terminal, adjust the DC component value superimposed on the quadrature signal in the same direction according to the feedback signal, wherein the feedback signal is identified by the second AOU terminal It is generated according to a comparison result between the MSE of the second radio frequency signal and a second preset threshold after the first radio frequency signal has local oscillator leakage.
A terminal comprising:

a first signal receiving unit, configured to receive a first radio frequency signal sent by the first AOU;

The first frequency adjustment unit is configured to adjust the radio frequency of the second radio frequency signal at the second AOU end, so that the adjusted frequency difference between the second radio frequency signal and the first radio frequency signal is greater than a first preset threshold ;as well as

The first leakage detection unit is configured to detect a local oscillator leakage signal on the first radio frequency signal when the frequency difference is greater than the first preset threshold.
The terminal according to claim 7, further comprising:

A first MSE calculation unit, configured to calculate the MSE of the second AOU terminal when the first radio frequency signal has local oscillator leakage; and

The first signal sending unit is configured to send a feedback signal to the first AOU terminal when the MSE is less than a second preset threshold, so that the first AOU terminal adjusts the superimposed quadrature signal in the same direction DC component value.
A terminal comprising:

The second signal sending unit is configured to send the first radio frequency signal to the second AOU end, so that the second AOU end adjusts the radio frequency frequency of the second radio frequency signal at the second AOU end, so that the adjusted second The frequency difference between the radio frequency signal and the first radio frequency signal is greater than a first preset threshold, so that when the frequency difference is greater than the first preset threshold, the second AOU terminal The first radio frequency signal is used to detect the leakage signal of the local oscillator.
The terminal according to claim 9, further comprising:

The second signal receiving unit is configured to adjust the DC component value superimposed on the co-directional quadrature signal according to the feedback signal when receiving the feedback signal sent by the second AOU terminal, wherein the feedback signal is generated by the The second AOU is generated according to a comparison result between the MSE of the second radio frequency signal and a second preset threshold after identifying the local oscillator leakage of the first radio frequency signal.
A terminal, comprising: a memory, a processor, and a computer program stored on the memory and operable on the processor, wherein, when the processor executes the computer program, it implements claims 1 to 3, The method for detecting a local oscillator leakage signal according to any one of claims 5 and/or the method for suppressing a local oscillator leakage signal according to any one of claims 4 and 6.
A computer-readable storage medium, storing computer-executable instructions, wherein the computer-executable instructions are used to execute the method for detecting a local oscillator leakage signal according to any one of claims 1 to 3, and 5 and/or Or the method for suppressing local oscillator leakage signals as described in any one of claims 4 and 6.