Radio frequency signal transmission control method, device and system and storage medium

Abstract

The invention discloses a radio frequency signal transmission control method and system and a storage medium, and the method comprises the steps: modulating a first radio frequency signal into an optical signal based on a transmitting end at preset intervals, and transmitting the optical signal to a receiving end through an optical link; obtaining a return optical signal in the optical signal based on the receiving end, and demodulating the return optical signal based on the transmitting end to obtain a second radio frequency signal; and obtaining a phase difference between the first radio frequency signal and the second radio frequency signal based on the phase discrimination circuit, and controlling the transmission of the first radio frequency signal based on the phase shift device and the phase difference in a preset period. According to the invention, the phase shift device shifts the phase of the transmitted first radio frequency signal through the phase difference, compensates the shifted phase, avoids the influence of phase shift on the transmission stability of the radio frequency signal, and ensures the stable transmission of the radio frequency signal.

Description

Technical Field

[0001] The present invention relates to the field of radio frequency technology, and particularly to a method, device, system and storage medium for transmitting and controlling radio frequency signals. Background Art

[0002] Radio frequency signals are electromagnetic waves with a certain transmission frequency after modulation, which play a crucial role in modern communication and are widely used in fields such as wireless communication, satellite communication, radar, and radio broadcasting. The transmission methods of radio frequency signals can generally be divided into two types: wired transmission and wireless transmission. Among them, wired transmission is to transmit radio frequency signals through wires or cables, and wireless transmission is to transmit radio frequency signals through radio waves. However, with the development of wireless access technology that combines fiber optic communication and wireless communication, radio frequency signal fiber optic transmission technology has emerged.

[0003] Radio frequency signal fiber optic transmission technology modulates radio frequency signals into optical signals at a central station or base station and transmits them through an optical fiber link to the base station or central station. For downlink signals, the base station demodulates them and transmits them through an antenna for users to use. For uplink signals, the central station demodulates and responds.

[0004] However, the transmission of optical signals by optical fibers will be affected by external factors and cause time delay, such as temperature, stress, humidity, nuclear radiation, electromagnetic field, vibration, etc., resulting in phase drift of radio frequency signals during fiber optic transmission and causing unstable transmission of radio frequency signals. Therefore, how to avoid the problem that the stable transmission of radio frequency signals is affected by phase offset during fiber optic link transmission of radio frequency signals is one of the technical problems that need to be solved currently. Summary of the Invention

[0005] The main purpose of the present invention is to provide a method, device, system and medium for transmitting and controlling radio frequency signals, aiming to solve the technical problem in the prior art of how to avoid the stable transmission of radio frequency signals being affected by phase offset during fiber optic link transmission of radio frequency signals.

[0006] To achieve the above object, the present invention provides a method for transmitting and controlling radio frequency signals, which is applied to a radio frequency system. The radio frequency system includes a transmitting end, a receiving end, an optical link, a phase discrimination circuit and a phase shifter; wherein, the transmitting end is connected to the receiving end through the optical link, and the phase discrimination circuit and the phase shifter are both connected to the transmitting end; the method for transmitting and controlling radio frequency signals includes:

[0007] Every preset period, based on the transmitting end, modulate the first radio frequency signal into an optical signal, and transmit the optical signal through the optical link to the receiving end;

[0008] Based on the receiving end, obtain the returned optical signal in the optical signal, and based on the transmitting end, demodulate the returned optical signal to obtain a second radio frequency signal;

[0009] Obtain the phase difference between the first radio frequency signal and the second radio frequency signal based on the phase discrimination circuit, and within the preset period, control the transmission of the first radio frequency signal based on the phase shifter and the phase difference.

[0010] Preferably, the phase shifter is an optical fiber delay line, and the step of controlling the transmission of the first radio frequency signal based on the phase shifter and the phase difference includes:

[0011] Determine the time delay corresponding to the phase difference, and determine the transmission optical path length corresponding to the time delay, and determine the number of reflections of the lens in the optical fiber delay line according to the transmission optical path length;

[0012] Access the optical signal to the optical fiber delay line, and control the lens in the optical fiber delay line to perform reflection processing on the optical signal;

[0013] After the number of times of the reflection processing reaches the number of reflections, execute the step of transmitting the optical signal to the receiving end through the optical link.

[0014] Preferably, after the step of determining the transmission optical path length corresponding to the time delay includes:

[0015] Select a plurality of time points from the preset period, and whenever any one of the plurality of time points is reached, obtain the temperature coefficient corresponding to the optical link at the time point, and generate a coefficient difference according to the temperature coefficient;

[0016] Judge whether the coefficient difference is greater than a preset temperature threshold. If it is greater than the preset temperature threshold, calculate a compensation coefficient corresponding to the coefficient difference, and update the transmission optical path length according to the compensation coefficient;

[0017] Wherein, the calculation formula of the compensation coefficient is:

[0018] k = L * f(Δt);

[0019] Wherein, K represents the compensation coefficient, L represents the optical link transmission length, Δt represents the coefficient difference, and f(Δt) represents the delay function corresponding to the coefficient difference.

[0020] Preferably, the step of obtaining the phase difference between the first radio frequency signal and the second radio frequency signal based on the phase discrimination circuit includes:

[0021] Based on the phase discrimination circuit, form the first waveform of the first radio frequency signal on a preset coordinate axis, and form the second waveform of the second radio frequency signal on the preset coordinate axis;

[0022] Generate the first waveform and the second waveform into a target waveform on the preset coordinate axis, and perform an integration operation on the target waveform to obtain a voltage value for conversion to generate the phase difference.

[0023] Preferably, after the step of obtaining a voltage value for conversion to generate the phase difference, it includes:

[0024] Determine whether the voltage value is greater than a preset voltage threshold. If it is greater than the preset voltage threshold, then execute the step of controlling the transmission of the first radio frequency signal based on the phase shifter and the phase difference within the preset period;

[0025] If the voltage value is not greater than the preset voltage threshold, then within the preset period, the step of transmitting the first radio frequency signal is:

[0026] Modulate the first radio frequency signal into an optical signal based on the transmitting end, and transmit the optical signal to the receiving end through an optical link.

[0027] Preferably, the radio frequency system is a simultaneous and co-frequency full-duplex system. After the step of controlling the transmission of the first radio frequency signal based on the phase shifter and the phase difference, it includes:

[0028] Predict the self-interference signal corresponding to the first radio frequency signal based on the first radio frequency signal, and convert the self-interference signal into an interference voltage value;

[0029] Determine whether the interference voltage value is greater than a preset interference voltage threshold. If it is greater than the preset interference voltage threshold, then construct a cancellation signal based on the self-interference signal;

[0030] Compensate the cancellation signal based on the phase difference, and cancel the self-interference signal based on the compensated cancellation signal.

[0031] Preferably, the optical signal and the returned optical signal are transmitted based on the same optical fiber in the optical link.

[0032] Furthermore, to achieve the above object, the present invention also provides a transmission control device for a radio frequency signal, which is applied to a radio frequency system. The radio frequency system includes a transmitting end, a receiving end, an optical link, a phase discrimination circuit, and a phase shifter; wherein, the transmitting end is connected to the receiving end through the optical link, and the phase discrimination circuit and the phase shifter are both connected to the transmitting end; the transmission control device for the radio frequency signal includes:

[0033] A transmission module, configured to transmit the optical signal modulated by the transmitting end to the receiving end through the optical link at intervals of a preset period, wherein the optical signal is modulated by the transmitting end based on the first radio frequency signal;

[0034] An acquisition module, configured to acquire a return optical signal in the optical signal based on the receiving end, and demodulate the return optical signal based on the transmitting end to obtain a second radio frequency signal;

[0035] A control module, configured to acquire a phase difference between the first radio frequency signal and the second radio frequency signal based on the phase discriminator circuit, and control the transmission of the first radio frequency signal based on the phase shifter and the phase difference within the preset period.

[0036] Further, to achieve the above object, the present invention further provides a radio frequency system, which includes a transmitting end, a receiving end, an optical link, a phase discriminator circuit, and a phase shifter; wherein, the transmitting end is connected to the receiving end through the optical link, and the phase discriminator circuit and the phase shifter are both connected to the transmitting end;

[0037] The radio frequency system further includes a memory, a processor, a communication bus, and a control program stored on the memory:

[0038] The communication bus is used to realize the connection communication between the processor and the memory;

[0039] The processor is configured to execute the control program to implement the steps of the above-mentioned radio frequency signal transmission control method.

[0040] Further, to achieve the above object, the present invention further provides a storage medium, on which a control program is stored, and when the control program is executed by a processor, the steps of the above-mentioned radio frequency signal transmission control method are implemented.

[0041] For the radio frequency signal transmission control method, device, system and storage medium of the present invention, at intervals of a preset period, a first radio frequency signal to be transmitted is modulated into an optical signal by the transmitting end of the radio frequency signal, and the optical signal is transmitted to the receiving end of the radio frequency signal through the optical link; then, a part of the signal in the return optical signal of the receiving end is controlled, and the returned part of the signal is acquired as the return optical signal, and then the return optical signal is restored by the transmitting end to obtain a second radio frequency signal; thereafter, the phase difference between the first radio frequency signal and the second radio frequency signal is acquired through the phase discriminator circuit, and within the preset period, the transmission of the first radio frequency signal is controlled by the phase shifter and the phase difference. Among them, the phase difference reflects the phase drift caused by the time delay generated when the radio frequency signal is transmitted through the optical link due to external influence. The phase shifter shifts the phase of the transmitted first radio frequency signal to compensate for the offset phase, avoiding the influence of the phase offset on the transmission stability of the radio frequency signal and ensuring the stable transmission of the radio frequency signal. Description of the Drawings

[0042] Figure 1 It is a schematic flowchart of the first embodiment of the radio frequency signal transmission control method of the present invention;

[0043] Figure 2 It is a schematic flowchart of the second embodiment of the method for controlling the transmission of radio frequency signals according to the present invention;

[0044] Figure 3 It is a schematic flowchart of the third embodiment of the method for controlling the transmission of radio frequency signals according to the present invention;

[0045] Figure 4 It is a schematic flowchart of the first embodiment of the device for controlling the transmission of radio frequency signals according to the present invention;

[0046] Figure 5 It is a schematic structural diagram of the hardware operating environment involved in an embodiment of the radio frequency system according to the present invention.

[0047] The realization, functional characteristics and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Specific embodiments

[0048] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0049] The present invention provides a method for controlling the transmission of radio frequency signals. Please refer to Figure 1 , Figure 1 It is a schematic flowchart of the first embodiment of the method for controlling the transmission of radio frequency signals according to the present invention.

[0050] The embodiments of the present invention provide embodiments of the method for controlling the transmission of radio frequency signals. It should be noted that although the logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than here. Specifically, the method for controlling the transmission of radio frequency signals in this embodiment includes:

[0051] Step S10, at every preset period, modulate the first radio frequency signal into an optical signal based on the transmitting end, and transmit the optical signal to the receiving end through an optical link.

[0052] The transmission control method of the radio frequency signal in this embodiment is applied to a radio frequency system. The radio frequency system includes a transmitting end, a receiving end, an optical link, a phase discrimination circuit, and a phase shifter. Among them, the transmitting end is a device for transmitting radio frequency signals, the receiving end is a device for receiving radio frequency signals, the optical link includes multiple optical fibers, and the transmitting end and the receiving end are connected through the optical fibers; the phase discrimination circuit is connected to the transmitting end and is used to judge whether the transmitted radio frequency signal has a phase shift by comparison; the phase shifter is also connected to the transmitting end and is used to compensate for the offset phase when the radio frequency signal has a phase shift. It should be noted that radio frequency signals often include two-way transmission of upstream and downstream, which causes the transmitting end and the receiving end to be interchanged. For example, in a communication system composed of a central station, a base station, and a user terminal, for the upstream transmission link, the radio frequency signal is first sent from the user terminal to the base station, and then from the base station to the central station; at this time, the base station is the transmitting end and the central station is the receiving end. For the downstream transmission link, the radio frequency signal is sent from the central station to the base station, and then from the base station to the user terminal; at this time, the central station becomes the transmitting end and the base station becomes the receiving end. Corresponding to the interchanged transmitting end and receiving end, the transmitting end and the receiving end are both connected with their respective phase discrimination circuits and phase shifters.

[0053] Further, a preset period is set in advance according to historical phase shift data, and every time this preset period elapses, it is judged whether the transmitted radio frequency signal has a phase shift. Specifically, the radio frequency signal to be transmitted is used as the first radio frequency signal, and the first radio frequency signal is modulated into an optical signal by the transmitting end and the optical signal is transmitted to the receiving end through the optical link.

[0054] Step S20, obtain the return optical signal in the optical signal based on the receiving end, and demodulate the return optical signal based on the transmitting end to obtain a second radio frequency signal.

[0055] Furthermore, the receiving end selects a part of the received optical signal as the return optical signal for return, and the transmitting end demodulates the return optical signal to obtain a second radio frequency signal. And, in order to avoid errors caused by different optical fibers during the transmission and return of the optical signal and the return optical signal, the transmission of the optical signal and the return of the return optical signal are controlled to use the same optical fiber for transmission.

[0056] Step S30, obtain the phase difference between the first radio frequency signal and the second radio frequency signal based on the phase discrimination circuit, and within the preset period, control the transmission of the first radio frequency signal based on the phase shifter and the phase difference.

[0057] Further, the phase discriminator circuit compares the phase of the first radio frequency signal with the phase of the second radio frequency signal to generate a phase difference therebetween. And within the current preset period, the phase shifter device compensates the phase of the first radio frequency signal according to the phase difference, and controls the first radio frequency signal to be transmitted according to the compensated phase. Wherein, the phase shifter device can be set as an optical fiber delay line, and the optical fiber time delay line realizes different time delays by controlling the optical signal to pass through transmission optical paths of different lengths. The step of controlling the transmission of the first radio frequency signal based on the phase shifter device and the phase difference includes:

[0058] Step S31, determining the time delay corresponding to the phase difference, determining the length of the transmission optical path corresponding to the time delay, and determining the number of reflections of the lens in the optical fiber delay line according to the length of the transmission optical path;

[0059] Furthermore, the phase difference is converted into a corresponding time delay, and the length of the optical path required to generate the time delay during the transmission of the optical signal is determined, and this length of the optical path is used as the length of the transmission optical path corresponding to the time delay. A lens is provided in the optical fiber delay line, and the lens can be set to be driven by a stepping motor. When it is necessary to compensate for the offset phase of the radio frequency signal through the phase shifter device, the stepping motor is controlled to move the lens, and the lens is moved into the transmission path of the optical signal. During the transmission of the optical signal, the lens reflects to increase the length of the transmission optical path, and the more the number of reflections, the longer the transmission optical path. Therefore, after determining the length of the transmission optical path corresponding to the time delay, the number of reflections corresponding to the length of the transmission optical path is determined according to the length of the transmission optical path that can be increased by each reflection of the lens in the optical fiber delay line.

[0060] It can be understood that the transmission of the optical signal by the optical fiber is affected by various external factors to generate time delays, especially the influence of temperature. And at different times within the preset period, the temperature corresponding to the optical fiber is different. If the compensation is carried out according to the same phase difference throughout the preset period, there may be a situation where the influence of temperature on the time delay is large at a certain time point resulting in insufficient compensation, or the influence of temperature on the time delay is small resulting in excessive compensation. Based on this, after determining the length of the transmission optical path corresponding to the time delay, it is necessary to correct the determined length of the transmission optical path in combination with the change of temperature, so that the matching between the length of the transmission optical path and the time delay is higher. Specifically, after the step of determining the length of the transmission optical path corresponding to the time delay, it includes:

[0061] Step a1, selecting multiple time points from the preset period, and whenever any one of the multiple time points is reached, obtaining the temperature coefficient corresponding to the optical link at the time point, and generating a coefficient difference according to the temperature coefficient;

[0062] Step a2, determine whether the coefficient difference is greater than a preset temperature threshold. If it is greater than the preset temperature threshold, calculate a compensation coefficient corresponding to the coefficient difference, and update the transmission optical path length according to the compensation coefficient.

[0063] Further, select multiple time points within a preset period. These multiple time points can be set according to a certain rule. For example, every 2 hours can be used as a time point, or they can be randomly selected. Whenever any one of the multiple time points is reached, obtain the temperature coefficient corresponding to the optical link at this time point. This temperature coefficient is a coefficient representing the temperature level. Then, perform a difference operation on this temperature coefficient and the temperature coefficient at the preset period interval to obtain the coefficient difference between the two. Among them, the temperature coefficient at the preset period interval is the temperature coefficient corresponding to the optical link when just entering the current preset period.

[0064] Furthermore, preset a preset temperature threshold representing the magnitude of temperature change, and compare the generated coefficient difference with this preset temperature threshold to determine whether the coefficient difference is greater than the preset temperature threshold. If it is greater than the preset temperature threshold, it means that the temperature at the current time point has changed relatively greatly compared to the initial temperature, and has a large impact on the time delay of the optical fiber. At this time, it is necessary to calculate the delay generated by this changed temperature, and correct the transmission optical path length based on this delay. Specifically, there is a preset formula for calculating the compensation coefficient corresponding to the coefficient difference. This preset formula can be specifically referred to as the following formula (1).

[0065] k = L * f(Δt);

[0066] Wherein, K represents the compensation coefficient, L represents the optical link transmission length, Δt represents the coefficient difference, and f(Δt) represents the delay function corresponding to the coefficient difference. In a specific embodiment, the optical link transmission length is 1 km, the preset temperature threshold is 1, representing a temperature change magnitude of 1 degree, and the generated coefficient difference is 2, representing a temperature change magnitude of 2 degrees between two moments. After the coefficient difference of 2 is processed by the delay function f(Δt), the generated function value is 2.8. Then, the calculated compensation coefficient k is equal to 2.8.

[0067] Further, a corresponding relationship between the compensation coefficient and the delay length is preset. According to this corresponding relationship, the delay length caused by temperature change within the preset period for the calculated compensation coefficient can be determined. Based on this delay length, determine the optical path length required to generate this time delay during the optical signal transmission process, and update the transmission optical path length with this optical path length. Furthermore, determine the corresponding updated reflection times for the updated transmission optical path length, so as to realize the updated transmission optical path length through the updated reflection times, and further realize better matching and compensation for the time delay changed due to temperature.

[0068] Step S32: Connect the optical signal to the fiber optic delay line, and control the lens in the fiber optic delay line to reflect the optical signal;

[0069] Step S33: After the number of times of the reflection process reaches the number of reflections, execute the step of transmitting the optical signal to the receiving end through the optical link.

[0070] Furthermore, transmit the optical signal to the fiber optic delay line, and control the lens in the fiber optic delay line to move onto the transmission path of the optical signal through the stepper motor in the fiber optic delay line, and the lens reflects the optical signal. Count the number of times the lens reflects the optical signal, and after the counted number reaches the number of reflections, transmit the optical signal to the receiving end through the optical link. In this way, the phase offset of the first radio frequency signal during transmission is compensated, ensuring the stable transmission of the first radio frequency signal.

[0071] In the transmission control method of the radio frequency signal in this embodiment, at every preset period, modulate the first radio frequency signal to be transmitted into an optical signal through the transmitting end of the radio frequency signal, and transmit the optical signal to the receiving end of the radio frequency signal through the optical link; then control the receiving end to return a part of the signal in the optical signal, and obtain the returned part of the signal as the returned optical signal, and then restore the returned optical signal through the transmitting end to obtain the second radio frequency signal; thereafter, obtain the phase difference between the first radio frequency signal and the second radio frequency signal through the phase discriminator circuit, and within the preset period, control the transmission of the first radio frequency signal through the phase shifter and the phase difference. Among them, the phase difference reflects the phase drift caused by the time delay generated when the radio frequency signal is transmitted through the optical link due to external influences. The phase shifter compensates for the offset phase by shifting the transmitted first radio frequency signal, avoiding the influence of phase offset on the transmission stability of the radio frequency signal and ensuring the stable transmission of the radio frequency signal.

[0072] Furthermore, please refer to Figure 2 , based on the first embodiment of the transmission control method of the radio frequency signal of the present invention, propose the second embodiment of the transmission control method of the radio frequency signal of the present invention.

[0073] The difference between the second embodiment of the transmission control method of the radio frequency signal and the first embodiment of the transmission control method of the radio frequency signal is that the step of obtaining the phase difference between the first radio frequency signal and the second radio frequency signal based on the phase discriminator circuit includes:

[0074] Step S34: Based on the phase discriminator circuit, form the first radio frequency signal into the first waveform on the preset coordinate axis, and form the second radio frequency signal into the second waveform on the preset coordinate axis;

[0075] Step S35: Generate the target waveform on the preset coordinate axis from the first waveform and the second waveform, perform an integration operation on the target waveform, obtain a voltage value for conversion, and generate the phase difference.

[0076] Furthermore, a phase discrimination circuit is a circuit that makes the output voltage have a definite relationship with the phase difference between two input signals. Therefore, the phase difference between the two input signals, that is, the first radio frequency signal and the second radio frequency signal, can be determined by determining its output voltage. Specifically, a two-dimensional coordinate axis is established in advance, and the first radio frequency signal and the second radio frequency signal are respectively converted into square waves on the preset coordinate axis through the analog-to-digital conversion circuit in the phase discrimination circuit, that is, the first waveform and the second waveform on the preset coordinate axis are formed.

[0077] Even further, the phase discrimination circuit determines the difference between the first waveform and the second waveform at each time according to the rising edge of the square wave, and forms the target waveform on the preset coordinate axis. Then, an integration operation is performed on the target waveform to obtain a voltage value, and the voltage value is converted, that is, the corresponding phase difference between the first radio frequency signal and the second radio frequency signal is generated.

[0078] It can be understood that although there is a phase difference between the first radio frequency signal and the second radio frequency signal, when the phase difference is small, there will be no phase shift, or the phase shift is very small and will not affect the stable transmission of the first radio frequency signal. Therefore, before the phase shifter performs phase shift compensation, the magnitude of the phase difference can be judged. Specifically, after the step of obtaining the voltage value for conversion and generating the phase difference, the following steps are included:

[0079] Step b1: Judge whether the voltage value is greater than the preset voltage threshold. If it is greater than the preset voltage threshold, then execute the step of controlling the transmission of the first radio frequency signal based on the phase shifter and the phase difference within the preset period;

[0080] Step b2: If the voltage value is not greater than the preset voltage threshold, then within the preset period, the transmission step of the first radio frequency signal is as follows:

[0081] Step b3: Modulate the first radio frequency signal into an optical signal based on the transmitting end, and transmit the optical signal to the receiving end through an optical link.

[0082] Furthermore, a preset voltage threshold for indicating that a large phase difference will cause a large phase shift is set in advance. The voltage value generating the phase difference is compared with this preset voltage threshold to judge whether the voltage value is greater than the preset voltage threshold. If it is greater than the preset voltage threshold, it is determined that the generated time delay is large and will cause a large phase shift. At this time, within the subsequent time of the preset period, the phase shifter compensates for the transmission of the first radio frequency signal according to the phase difference to ensure the stable transmission of the first radio frequency signal.

[0083] Furthermore, if it is determined through comparison that the voltage value is not greater than the preset threshold, it indicates that there is no need to compensate for the transmission of the first radio frequency signal. At this time, within the subsequent time of the preset period, the first radio frequency signal is modulated into an optical signal by the transmitting end, and the optical signal is directly transmitted to the receiving end through the optical link.

[0084] In this embodiment, the first radio frequency signal and the second radio frequency signal are respectively generated into the first waveform and the second waveform, and the corresponding voltage value is obtained by integrating the waveform differences between the first waveform and the second waveform. Only when the voltage value is greater than the preset voltage threshold, the phase shifter compensates the first radio frequency signal according to the phase difference corresponding to the voltage value, realizing accurate compensation for the first radio frequency signal.

[0085] Further, please refer to Figure 3 , and based on the first and second embodiments of the transmission control method of the radio frequency signal of the present invention, the third embodiment of the transmission control method of the radio frequency signal of the present invention is proposed.

[0086] The difference between the third embodiment of the transmission control method of the radio frequency signal and the first and second embodiments of the transmission control method of the radio frequency signal is that the radio frequency system is a simultaneous and co-frequency full-duplex system. After the step of controlling the transmission of the first radio frequency signal based on the phase shifter and the phase difference, the following steps are included:

[0087] Step S40, predicting the self-interference signal corresponding to the first radio frequency signal based on the first radio frequency signal, and converting the self-interference signal into an interference voltage value;

[0088] Step S50, determining whether the interference voltage value is greater than the preset interference voltage threshold. If it is greater than the preset interference voltage threshold, constructing a cancellation signal based on the self-interference signal;

[0089] Step S60, compensating the cancellation signal based on the phase difference, and canceling the self-interference signal based on the compensated cancellation signal.

[0090] Further, the radio frequency system of this embodiment is a simultaneous and co-frequency full-duplex system. Different from the traditional time-division duplex mode and frequency-division duplex mode, it transmits data in the same time period and the same frequency band, and the time resource utilization rate and spectrum utilization rate are respectively doubled compared with time-division duplex and frequency-division duplex. However, since the transceiver is in the same frequency band and the same time slot, its own transmitted signal will cause great interference to its own reception. Therefore, for the simultaneous and co-frequency full-duplex system of this embodiment, after compensating for the phase offset of the first radio frequency signal according to the phase difference, it is also necessary to cancel the self-interference generated by itself.

[0091] Specifically, a part of the first radio frequency signal is obtained as a reference for the self-interference signal. Based on this reference, the self-interference information generated by the first radio frequency signal is predicted, and the self-interference signal is converted into an interference voltage value. In order to represent the magnitude of the self-interference signal, a preset interference voltage threshold is pre-set. The converted interference voltage value is compared with this interference voltage threshold to determine whether the interference voltage value is greater than the preset interference voltage threshold. If it is greater than the preset interference voltage threshold, it indicates that the self-interference generated by the first radio frequency signal is too large and will interfere with the first radio frequency signal, and interference cancellation operations need to be performed. Conversely, if it is determined through comparison that the interference voltage value is not greater than the preset interference voltage threshold, it indicates that the self-interference value generated by the first radio frequency signal is not large and will not interfere with the first radio frequency signal, and interference cancellation operations may not be performed.

[0092] Furthermore, for the self-interference signal that needs to be eliminated, a cancellation signal corresponding to the self-interference signal is constructed. The cancellation signal will also generate a time delay during transmission. In order to avoid the influence of the time delay, it needs to be compensated according to the phase difference. The compensation method can be the same as that of the first radio frequency signal and will not be elaborated here. Then, the self-interference signal is cancelled by the compensated cancellation signal to prevent the self-interference signal from interfering with the first radio frequency signal.

[0093] The radio frequency system of this embodiment is a simultaneous and co-frequency full-duplex system, which has high time resource utilization and frequency utilization. And in order to avoid the interference influence generated by itself, a signal for cancelling interference is constructed. At the same time, in order to avoid the influence of the time delay on the cancellation effect, the cancellation signal is also compensated, and the self-interference signal is cancelled by the compensated cancellation signal, achieving the maximum degree of cancellation of the self-interference signal.

[0094] In addition, the embodiment of the present invention also provides a transmission control device for radio frequency signals. Please refer to Figure 4 , Figure 4 which is a schematic diagram of the module structure related to the embodiment scheme of the transmission control device for radio frequency signals of the present invention.

[0095] Specifically, in this embodiment, the transmission control device for radio frequency signals is applied to a radio frequency system. The radio frequency system includes a transmitting end, a receiving end, an optical link, a phase discrimination circuit, and a phase shifter; wherein, the transmitting end is connected to the receiving end through the optical link, and the phase discrimination circuit and the phase shifter are both connected to the transmitting end;

[0096] The transmission control device for radio frequency signals includes:

[0097] A transmission module, which is used to transmit the optical signal modulated by the transmitting end to the receiving end through the optical link at every preset period, where the optical signal is modulated by the transmitting end based on the first radio frequency signal;

[0098] An acquisition module, configured to acquire a return optical signal in the optical signal based on the receiving end, and demodulate the return optical signal based on the transmitting end to obtain a second radio frequency signal;

[0099] A control module, configured to acquire a phase difference between the first radio frequency signal and the second radio frequency signal based on the phase discriminator circuit, and control the transmission of the first radio frequency signal based on the phase shifter and the phase difference within the preset period.

[0100] The specific implementation manners of the transmission control device for radio frequency signals of the present invention are basically the same as those of the various embodiments of the above-mentioned transmission control method for radio frequency signals, and will not be elaborated herein.

[0101] In addition, an embodiment of the present invention further provides a radio frequency system, which includes a transmitting end, a receiving end, an optical link, a phase discriminator circuit, and a phase shifter; wherein, the transmitting end is connected to the receiving end through the optical link, and the phase discriminator circuit and the phase shifter are both connected to the transmitting end.

[0102] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of the hardware operating environment of the device involved in the embodiment solution of the radio frequency system of the present invention.

[0103] As Figure 5 shown, the radio frequency system may further include: a processor 1001, such as a CPU, a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to implement connection communication between these components. The user interface 1003 may include a display screen (Display) and an input unit such as a keyboard (Keyboard). Optionally, the user interface 1003 may further include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. Optionally, the memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0104] Those skilled in the art can understand that Figure 5 the hardware structure of the radio frequency system shown in

[0105] does not constitute a limitation on the radio frequency system, and may include more or fewer components than those shown in the figure, or combine some components, or have different component arrangements. Figure 5As shown in the figure, the storage 1005, which is a storage medium, may include an operating system, a network communication module, a user interface module, and a control program. Among them, the operating system is a program for managing and controlling radio frequency systems and software resources, and supports the operation of the network communication module, the user interface module, the control program, and other programs or software; the network communication module is used for managing and controlling the network interface 1004; the user interface module is used for managing and controlling the user interface 1003.

[0106] In Figure 5 In the hardware structure of the radio frequency system shown in the figure, the network interface 1004 is mainly used to connect to other system servers and communicate data with other system servers; the user interface 1003 is mainly used to connect to the client (user side) and communicate data with the client; the processor 1001 can call the control program stored in the storage 1005 and perform the following operations:

[0107] At every preset period, based on the transmitting end, modulate the first radio frequency signal into an optical signal, and transmit the optical signal to the receiving end through an optical link;

[0108] Based on the receiving end, obtain the returned optical signal in the optical signal, and based on the transmitting end, demodulate the returned optical signal to obtain a second radio frequency signal;

[0109] Based on the phase discriminator circuit, obtain the phase difference between the first radio frequency signal and the second radio frequency signal, and within the preset period, based on the phase shifter and the phase difference, control the transmission of the first radio frequency signal.

[0110] Further, the phase shifter is an optical fiber delay line, and the step of controlling the transmission of the first radio frequency signal based on the phase shifter and the phase difference includes:

[0111] Determine the time delay corresponding to the phase difference, and determine the transmission optical path length corresponding to the time delay, and determine the number of reflections of the lens in the optical fiber delay line according to the transmission optical path length;

[0112] Connect the optical signal to the optical fiber delay line, and control the lens in the optical fiber delay line to perform reflection processing on the optical signal;

[0113] After the number of times of the reflection processing reaches the number of reflections, execute the step of transmitting the optical signal to the receiving end through the optical link.

[0114] Further, after the step of determining the transmission optical path length corresponding to the time delay, the processor 1001 can call the control program stored in the storage 1005 and perform the following operations:

[0115] Select multiple time points within the preset period. Whenever any one of the multiple time points is reached, obtain the temperature coefficient corresponding to the optical link at that time point, and generate a coefficient difference according to the temperature coefficient;

[0116] Determine whether the coefficient difference is greater than a preset temperature threshold. If it is greater than the preset temperature threshold, calculate a compensation coefficient corresponding to the coefficient difference, and update the transmission optical path length according to the compensation coefficient;

[0117] Among them, the calculation formula of the compensation coefficient is:

[0118] k = L * f(Δt);

[0119] Among them, K represents the compensation coefficient, L represents the optical link transmission length, Δt represents the coefficient difference, and f(Δt) represents the delay function corresponding to the coefficient difference.

[0120] Further, the step of obtaining the phase difference between the first radio frequency signal and the second radio frequency signal based on the phase discrimination circuit includes:

[0121] Based on the phase discrimination circuit, form the first radio frequency signal into a first waveform on a preset coordinate axis, and form the second radio frequency signal into a second waveform on the preset coordinate axis;

[0122] Generate the first waveform and the second waveform into a target waveform on the preset coordinate axis, and perform an integration operation on the target waveform, obtain a voltage value for conversion, and generate the phase difference.

[0123] Further, after the step of obtaining a voltage value for conversion and generating the phase difference, the processor 1001 can call the control program stored in the memory 1005 and perform the following operations:

[0124] Determine whether the voltage value is greater than a preset voltage threshold. If it is greater than the preset voltage threshold, execute the step of controlling the transmission of the first radio frequency signal based on the phase shifter and the phase difference within the preset period;

[0125] If the voltage value is not greater than the preset voltage threshold, then within the preset period, the transmission step of the first radio frequency signal is:

[0126] Based on the transmitter, modulate the first radio frequency signal into an optical signal, and transmit the optical signal through the optical link to the receiver.

[0127] Further, the radio frequency system is a simultaneous and co-frequency full-duplex system. After the step of controlling the transmission of the first radio frequency signal based on the phase shifter device and the phase difference, the processor 1001 may call the control program stored in the memory 1005 and perform the following operations:

[0128] Predict the self-interference signal corresponding to the first radio frequency signal based on the first radio frequency signal, and convert the self-interference signal into an interference voltage value;

[0129] Determine whether the interference voltage value is greater than a preset interference voltage threshold. If it is greater than the preset interference voltage threshold, construct a cancellation signal based on the self-interference signal;

[0130] Compensate the cancellation signal based on the phase difference, and cancel the self-interference signal based on the compensated cancellation signal.

[0131] Further, the optical signal and the returned optical signal are transmitted based on the same optical fiber in the optical link.

[0132] The specific implementation manner of the radio frequency system of the present invention is basically the same as that of each embodiment of the above radio frequency signal transmission control method, and will not be described in detail here.

[0133] The embodiment of the present invention also proposes a storage medium. The storage medium stores a control program, and when the control program is executed by a processor, the steps of the radio frequency signal transmission control method as described above are implemented.

[0134] The storage medium of the present invention may be a computer-readable storage medium, and its implementation manner is basically the same as that of each embodiment of the above radio frequency signal transmission control method, and will not be described in detail here.

[0135] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific implementation manners. The above specific implementation manners are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit and scope protected by the claims of the present invention. All those equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, or directly or indirectly applied to other related technical fields, all fall within the protection scope of the present invention.

Claims

1. A transmission control method for radio frequency signals, applied to a radio frequency system, characterized in that: The radio frequency system includes a transmitter, a receiver, an optical link, a phase detection circuit and a phase shift device; wherein the transmitter is connected to the receiver via an optical link, and the phase detection circuit and the phase shift device are both connected to the transmitter; the transmission control method of the radio frequency signal includes: At every preset period, based on the transmitting end, modulate the first radio frequency signal into an optical signal, and transmit the optical signal to the receiving end through the optical link; Acquire a return optical signal in the optical signal based on the receiving end, and demodulate the return optical signal based on the transmitting end to obtain a second radio frequency signal; The phase difference between the first radio frequency signal and the second radio frequency signal is obtained based on the phase detection circuit, and within the preset period, the transmission of the first radio frequency signal is controlled based on the phase shifting device and the phase difference.

2. The method for controlling transmission of radio frequency signals according to claim 1, wherein: The phase shifting device is an optical fiber delay line, and the step of controlling the transmission of the first radio frequency signal based on the phase shifting device and the phase difference comprises: Determining a time delay corresponding to the phase difference, and determining a transmission optical path length corresponding to the time delay, and determining the number of reflections of a lens in the optical fiber delay line according to the transmission optical path length; Connecting the optical signal to the optical fiber delay line, and controlling the lens in the optical fiber delay line to perform reflection processing on the optical signal; After the number of reflection processes reaches the number of reflections, a step of transmitting the optical signal to a receiving end through an optical link is performed.

3. The transmission control method of radio frequency signal according to claim 2, characterized in that: The step of determining the transmission optical path length corresponding to the time delay comprises: Select multiple time points from the preset period, and whenever any one of the multiple time points is reached, obtain the temperature coefficient of the optical link corresponding to the time point, and generate a coefficient difference according to the temperature coefficient; Determine whether the coefficient difference is greater than a preset temperature threshold, and if so, calculate a compensation coefficient corresponding to the coefficient difference, and update the transmission optical path length according to the compensation coefficient; Wherein, the calculation formula of the compensation coefficient is: k = L*f(Δt); Wherein, K represents the compensation coefficient, L represents the transmission length of the optical link, Δt represents the coefficient difference, and f(Δt) represents the delay function corresponding to the coefficient difference.

4. The transmission control method of radio frequency signal according to claim 1, characterized in that: The step of acquiring the phase difference between the first radio frequency signal and the second radio frequency signal based on the phase detection circuit comprises: Based on the phase detection circuit, the first radio frequency signal is formed into a first waveform on a preset coordinate axis, and the second radio frequency signal is formed into a second waveform on a preset coordinate axis; The first waveform and the second waveform are generated as target waveforms on the preset coordinate axis, and the target waveforms are integrated to obtain voltage values ​​for conversion to generate the phase difference.

5. The transmission control method of radio frequency signal according to claim 4, characterized in that: The step of obtaining the voltage value for conversion to generate the phase difference comprises: Determine whether the voltage value is greater than a preset voltage threshold, and if so, execute the step of controlling the transmission of the first radio frequency signal within the preset period based on the phase shifting device and the phase difference; If the voltage value is not greater than the preset voltage threshold, then within the preset period, the steps of transmitting the first radio frequency signal are: The transmitting end modulates the first radio frequency signal into an optical signal, and transmits the optical signal to the receiving end through an optical link.

6. The method for controlling transmission of radio frequency signals according to any one of claims 1 to 5, characterized in that: The radio frequency system is a simultaneous frequency full-duplex system, and the step of controlling the transmission of the first radio frequency signal based on the phase shifting device and the phase difference comprises: Predicting a self-interference signal corresponding to the first radio frequency signal based on the first radio frequency signal, and converting the self-interference signal into an interference voltage value; Determine whether the interference voltage value is greater than a preset interference voltage threshold, and if so, construct a cancellation signal based on the self-interference signal; The cancellation signal is compensated based on the phase difference, and the self-interference signal is canceled based on the compensated cancellation signal.

7. The method for controlling transmission of radio frequency signals according to any one of claims 1 to 5, characterized in that: The optical signal and the return optical signal are transmitted based on the same optical fiber in the optical link.

8. A transmission control device for radio frequency signals, applied to a radio frequency system, characterized in that: The radio frequency system includes a transmitting end, a receiving end, an optical link, a phase detection circuit and a phase shift device; wherein the transmitting end is connected to the receiving end via an optical link, and the phase detection circuit and the phase shift device are both connected to the transmitting end; the transmission control device of the radio frequency signal includes: A transmission module, configured to transmit the optical signal modulated by the transmitting end to the receiving end through the optical link at intervals of a preset period, wherein the optical signal is modulated by the transmitting end based on the first radio frequency signal; an acquisition module, configured to acquire a return optical signal in the optical signal based on the receiving end, and demodulate the return optical signal based on the transmitting end to obtain a second radio frequency signal; A control module is used to obtain a phase difference between the first radio frequency signal and the second radio frequency signal based on the phase detection circuit, and control the transmission of the first radio frequency signal within the preset period based on the phase shifting device and the phase difference.

9. A radio frequency system, characterized in that: The radio frequency system includes a transmitting end, a receiving end, an optical link, a phase detection circuit and a phase shifting device; wherein the transmitting end is connected to the receiving end via an optical link, and the phase detection circuit and the phase shifting device are both connected to the transmitting end; The radio frequency system further includes a memory, a processor, a communication bus, and a control program stored in the memory: The communication bus is used to realize the connection and communication between the processor and the storage; The processor is used to execute the control program to implement the steps of the radio frequency signal transmission control method according to any one of claims 1 to 8.

10. A storage medium, characterized in that: The storage medium stores a control program, and when the control program is executed by the processor, the steps of the radio frequency signal transmission control method according to any one of claims 1 to 8 are implemented.

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