Signal Transmission Method, System, Network Device, and Storage Medium

Abstract

The present application provides a signal transmission method, system, network device and storage medium. The method includes: modulating a predetermined digital signal into an analog signal within a predetermined frequency range; combining the modulated analog signal with a radio frequency signal to be transmitted to obtain a combined analog signal; transmitting, through a signal transmitter, a corresponding optical signal obtained by electro-optic conversion of the combined analog signal, and receiving, through a signal receiver, a corresponding analog signal obtained by photoelectric conversion of the corresponding optical signal; extracting the analog signal and the radio frequency signal from the converted analog signal; demodulating the extracted analog signal into a digital signal to transmit the demodulated digital signal.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and particularly to a signal transmission method, system, network device, and storage medium. Background Art

[0002] Radio Over Fiber (ROF) technology is usually applied to the reception and transmission of radio frequency signals in a communication system. Specifically, ROF technology can convert a radio frequency signal into an optical signal through electro-optic conversion and then transmit it in an optical fiber through opto-electric conversion. Through the application of this technology, the miniaturization, low power consumption, and flexible deployment of an Active Antenna Unit (AAU) device can be achieved.

[0003] In a communication system based on ROF technology, a relatively complex device is required to transmit the AAU control signal, and the circuit development cost is relatively high. Summary of the Invention

[0004] This application provides a signal transmission method, system, network device, and storage medium.

[0005] An embodiment of this application provides a signal transmission method, including: modulating a predetermined digital signal into an analog signal within a predetermined frequency range; combining the modulated analog signal with a radio frequency signal to be transmitted to obtain a combined analog signal; transmitting, through a signal transmitter, a corresponding optical signal obtained by electro-optic conversion of the combined analog signal, and receiving, through a signal receiver, a corresponding analog signal obtained by opto-electric conversion of the corresponding optical signal; extracting the analog signal and the radio frequency signal from the converted analog signal; demodulating the extracted analog signal into a digital signal to transmit the demodulated digital signal.

[0006] An embodiment of this application provides a signal transmission system, including: a modulator for modulating a predetermined digital signal into an analog signal within a predetermined frequency range; a first combiner for combining the modulated analog signal with a radio frequency signal to be transmitted to obtain a combined analog signal; a signal transmitter for transmitting a corresponding optical signal obtained by electro-optic conversion of the combined analog signal; a signal receiver for receiving a corresponding analog signal obtained by opto-electric conversion of the corresponding optical signal; a second combiner for extracting the analog signal and the radio frequency signal from the converted analog signal; and a demodulator for demodulating the extracted analog signal into a digital signal to transmit the demodulated digital signal.

[0007] An embodiment of the present application provides a network device, including: one or more processors; a memory storing one or more programs, which when executed by the one or more processors, cause the one or more processors to implement any one of the signal transmission methods in the embodiments of the present application.

[0008] An embodiment of the present application provides a storage medium storing a computer program, which when executed by a processor, implements any one of the signal transmission methods in the embodiments of the present application.

[0009] According to the signal transmission method, system, network device, and storage medium of the embodiments of the present application, a digital signal is converted into an analog signal within a predetermined frequency range, the converted analog signal and the radio frequency signal to be transmitted are combined, and after the combined signal undergoes optoelectronic and electro-optical conversions, the radio frequency signal and the low-frequency signal are respectively extracted, and then the extracted analog signal is demodulated into a digital signal by a demodulator, thereby realizing the transmission of a digital-analog hybrid signal through simple devices and achieving the effect of simplifying and reducing the design cost.

[0010] More descriptions about the above embodiments and other aspects of the present application and their implementation manners are provided in the drawings description, the specific implementation manner, and the claims. Drawings Description

[0011] Figure 1 A flowchart showing the signal transmission method according to an embodiment of the present application.

[0012] Figure 2 A schematic structural diagram showing the signal transmission system provided by an embodiment of the present invention.

[0013] Figure 3 A more detailed schematic structural diagram showing the signal transmission system according to some exemplary embodiments of the present invention.

[0014] Figure 4 is Figure 3 A schematic diagram showing the working principle of the modulator shown.

[0015] Figure 5 is Figure 3 A schematic diagram showing the working principle of converting multiple analog signals into optical signals in the signal transmission system shown.

[0016] Figure 6 is Figure 3 A schematic diagram showing the working principle of converting optical signals into multiple analog signals in the signal transmission system shown.

[0017] Figure 7 A schematic structural diagram showing the transmission link of the communication system according to an embodiment of the present application.

[0018] Figure 8Show Figure 7 The flow diagram of the signal transmission method in the transmitting link of the communication system in

[0019] Figure 9 The structural diagram of the transmitting link of the communication system according to the embodiment of the present application is shown.

[0020] Figure 10 Show Figure 9 The flow diagram of the signal transmission method in the receiving link of the communication system in

[0021] Figure 11 The structural diagram of the exemplary hardware architecture of a computing device capable of implementing the signal transmission method according to the embodiment of the present invention is shown. Detailed implementation manners

[0022] To make the objectives, technical solutions and advantages of the present application more clear and understandable, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other arbitrarily.

[0023] Figure 1 The flow diagram of the signal transmission method according to the embodiment of the present application is shown. As Figure 1 shown, the signal transmission method in the embodiment of the present application may include the following steps.

[0024] S110, modulating a predetermined digital signal into an analog signal within a predetermined frequency range.

[0025] In the embodiment of the present application, the predetermined digital signal may be a control signal, and the predetermined digital signal may be converted into an analog signal within a predetermined frequency range through a modulator.

[0026] In the description of the following embodiments of the present application, the analog signal within the predetermined frequency range may be a radio wave signal with a frequency band from 30KHz to 300KHz. For the convenience of description, the analog signal within the predetermined frequency range may be referred to as a low-frequency analog signal. In some embodiments, the predetermined frequency range may be set according to the actual application scenario, and the embodiments of the present application do not make specific limitations.

[0027] S120, combining the modulated analog signal with the radio frequency signal to be transmitted to obtain a combined analog signal.

[0028] In this step, the converted analog signal and the radio frequency signal to be transmitted may be combined through a combiner to obtain a combined analog signal.

[0029] S130. Transmit, via a signal transmitter, the corresponding optical signal obtained by electro-optic conversion of the combined analog signal, and receive, via a signal receiver, the corresponding analog signal obtained by photo-electric conversion of the corresponding optical signal.

[0030] In this step, the combined analog signal can be converted into the corresponding optical signal by using Radio Over Fiber (ROF) technology via a first ROF module, and the optical signal obtained via the first ROF module can be converted into the corresponding analog signal via a second ROF module.

[0031] S140. Extract the analog signal and the radio frequency signal from the converted analog signal.

[0032] In this step, after the analog signal output by the second ROF module is processed by a heterodyne combiner, the analog signal and the radio frequency signal can be extracted.

[0033] S150. Demodulate the extracted analog signal into a digital signal to transmit the demodulated digital signal.

[0034] In this step, the extracted analog signal can be demodulated into a digital signal by a demodulator, and after being processed by a Field Programmable Gate Array (FPGA), the transmission of the control signal can be realized.

[0035] According to the signal transmission method of the embodiments of the present application, after converting the digital signal into an analog signal, the converted analog signal and the radio frequency signal to be transmitted are combined. After the combined signal undergoes photo-electric and electro-optic conversions, the radio frequency signal and the analog signal are respectively extracted, and then the extracted analog signal is demodulated into a digital signal by a demodulator, thereby realizing the transmission of the digital-analog hybrid signal through simple devices, achieving the effect of simplifying and reducing the design cost.

[0036] In one embodiment, S120 may specifically include: S121. Perform a first filtering process on the modulated analog signal and the radio frequency signal to be transmitted; S122. Perform a combining process on the filtered analog signal and the radio frequency signal to obtain the combined analog signal.

[0037] In this embodiment, the first filtering process is used for harmonic filtering, and the interference signals in the analog signal and the radio frequency signal can be filtered out through the first filtering process.

[0038] In one embodiment, S150 may specifically include: S151. Perform a second filtering process on the extracted analog signal; S152. Demodulate the analog signal after the second filtering process into a digital signal.

[0039] In this embodiment, the second filtering process is used to perform harmonic filtering and eliminate intermodulation interference. The radio frequency signal and the analog signal are filtered by the second filter to reduce the harmonic components of the signal.

[0040] In one embodiment, in a signal transmission system for a receiving channel, the clock generator can generate two clock signals: the first clock signal and the second clock signal. The first clock signal can be used as the carrier of the digital signal for the modulator, and the second clock signal can be used as the carrier of the digital signal for the modulator. The first clock signal and the second clock signal have different frequencies.

[0041] In this embodiment, step S110 may include: modulating the digital signal into an analog signal within a predetermined frequency range using the first clock signal, where the first clock signal is a pre-generated carrier signal for signal modulation.

[0042] In one embodiment, if the predetermined digital signal is the digital signal of the transmitting channel, the combined analog signal and the signal extracted from the converted analog signal both include the second clock signal.

[0043] In this embodiment, the above step S120 may specifically include: performing a combining process on the pre-generated second clock signal, the modulated analog signal, and the radio frequency signal to be transmitted to obtain a combined analog signal, where the second clock signal and the first clock signal are clock signals with different frequencies generated by the same clock generator.

[0044] In this embodiment, the above step S140 may specifically include: extracting the second clock signal, the analog signal, and the radio frequency signal from the converted analog signal.

[0045] In an embodiment of the present application, if the digital signal is the digital signal of the transmitting channel, the second clock signal generated by the clock generator is used to perform up-conversion processing on the extracted radio frequency signal after being transmitted through the first ROF module at the signal transmitting end and the second ROF module at the signal receiving end.

[0046] In this embodiment, in step S140, after extracting the second clock signal, the analog signal, and the radio frequency signal from the converted analog signal, the signal transmission method may further include: S160, mixing the extracted second clock signal and the extracted radio frequency signal to perform up-conversion processing on the extracted radio frequency signal to obtain a corresponding radio signal; S161, performing signal amplification processing on the radio signal; S162, transmitting the radio signal after signal amplification processing.

[0047] In this embodiment, in the signal transmission system for the transmitting channel, the radio frequency signal and the clock signal are mixed by a mixer to achieve up-conversion, generating a radio signal such as a millimeter wave signal. The millimeter wave signal is amplified by an amplifier and then radiated by an antenna to achieve the transmission of the radio signal.

[0048] In one embodiment, before performing up-conversion processing on the extracted radio frequency signal, it is necessary to perform filtering processing on the extracted second clock signal and the extracted radio frequency signal. In this embodiment, S160 may specifically include: S1601, performing second filtering processing on the extracted second clock signal and the extracted radio frequency signal; S1602, mixing the second clock signal after the second filtering processing and the radio frequency signal after the second filtering processing to obtain the corresponding radio signal.

[0049] If the predetermined digital signal is the digital signal of the receiving channel, before step S110, the signal transmission method further includes: S11, performing signal amplification processing on the radio signal received by the antenna to obtain the radio signal after signal amplification processing; S12, mixing the radio signal after signal amplification processing with the pre-generated second clock signal to perform down-conversion processing on the amplified radio signal to obtain the radio frequency signal to be transmitted.

[0050] In this embodiment, in the signal transmission system for the receiving channel, the radio signal such as a millimeter wave signal and the clock signal are mixed by a mixer to achieve down-conversion, generating a radio frequency signal.

[0051] In one embodiment, if the predetermined digital signal is the digital signal of the receiving channel, after step S140, the signal transmission method further includes: S170, performing second filtering processing on the extracted radio frequency signal; S171, performing digital sampling on the radio frequency signal after the second filtering processing to obtain the digitally sampled radio frequency signal.

[0052] In one embodiment, if the predetermined digital signal is the digital signal of the receiving channel, after step S150, the signal transmission method further includes: S180, performing logical processing on the demodulated digital signal, the digitally processed digital signal.

[0053] In this embodiment, an analog-to-digital converter (ADC) can be used to perform digital processing on the radio frequency signal obtained by down-conversion processing. The radio frequency signal obtained by down-conversion processing is sampled by the ADC to achieve the transmission of the radio frequency signal.

[0054] In one embodiment, if the predetermined digital signal is the digital signal of the receiving channel, after step S150, the method further includes: S190, performing logic processing on the demodulated digital signal by using a field programmable gate array (FPGA) chip to obtain the digitally processed digital signal.

[0055] In this embodiment, in the signal transmission system for the receiving channel, the analog signal is demodulated by a demodulator to generate a digital signal, and the digital signal is processed by the FPGA to implement the transmission of the control signal.

[0056] According to the signal transmission method of the embodiment of the present application, after converting the digital signal into an analog signal within a predetermined range, it is combined with the radio frequency signal to be transmitted and transmitted together in the ROF module. After being transmitted through the optical fiber and then passing through the ROF module again, the optical signal is converted into the corresponding radio frequency signal and analog signal. After being extracted by the combiner and filter, the radio frequency signal and the analog signal are respectively extracted, so that the extracted analog signal is demodulated by the demodulator into a digital signal, realizing the transmission of the digital-analog hybrid signal and achieving the effects of simplifying the circuit and reducing the design cost.

[0057] Next, with reference to the accompanying drawings, the signal transmission system according to the embodiment of the present invention will be described in detail. Figure 2 The structural schematic diagram of the signal transmission system provided by an embodiment of the present invention is shown. As Figure 2 shown, the signal transmission system may include the following modules and devices.

[0058] A modulator 201, configured to modulate a predetermined digital signal into an analog signal within a predetermined frequency range.

[0059] A first combiner 203, configured to combine the modulated analog signal with the radio frequency signal to be transmitted to obtain a combined analog signal.

[0060] A signal transmitter 205, configured to transmit the corresponding optical signal obtained by electro-optic conversion of the combined analog signal.

[0061] A signal receiver 207, configured to receive the corresponding analog signal obtained by opto-electric conversion of the corresponding optical signal.

[0062] A second combiner 209, configured to extract the analog signal and the radio frequency signal from the converted analog signal.

[0063] A demodulator 211, configured to demodulate the extracted analog signal into a digital signal to transmit the demodulated digital signal.

[0064] According to the signal transmission system of the embodiments of the present application, a digital signal is converted into an analog signal within a predetermined frequency range by a modulator. After the modulated analog signal and the radio frequency signal to be transmitted are combined by a combiner, they are transmitted together in the ROF module. After being transmitted through an optical fiber and then passing through the ROF module again, the optical signal is converted into the corresponding radio frequency signal and analog signal. Through the extraction by the combiner and the filter, the radio frequency signal and the analog signal are respectively extracted. Thus, the extracted analog signal is demodulated into a digital signal by a demodulator, realizing the transmission of the digital-analog hybrid signal and achieving the effects of simplifying the circuit and reducing the design cost.

[0065] Figure 3 FIG. [FIG. number not provided in the original] shows a more detailed structural schematic diagram of a signal transmission system according to some exemplary embodiments of the present invention. Figure 3 and Figure 2 the same or equivalent structures use the same reference numerals. The following will describe a signal transmission system according to another embodiment of the present invention in conjunction with Figure 3 FIG. [FIG. number not provided in the original].

[0066] As Figure 3 shown, the signal transmission system may include: a modulator 201, a first filter 202, a first combiner 203, a signal transmitter 205, a signal receiver 207, a second combiner 209, a second filter 210, and a demodulator 211. However, the present application is not limited to the specific modules and devices described above and shown in Figure 3 FIG. [FIG. number not provided in the original]. In some embodiments, the signal transmission system may only include some of the above modules and devices, that is, the signal transmission system may have a more flexible module configuration, which will be described below in conjunction with specific embodiments.

[0067] In one embodiment, the modulator 201 is configured to convert a predetermined digital signal into an analog signal within a predetermined frequency range through modulation; the first filter 202 is configured to perform a first filtering process on the modulated analog signal and the radio frequency signal to be transmitted; the first combiner 203 is further configured to combine the filtered analog signal and the filtered radio frequency signal to obtain a combined analog signal; the signal transmitter 205 is configured to transmit the corresponding optical signal obtained by electro-optical conversion of the combined analog signal; the signal receiver 207 is configured to receive the corresponding analog signal obtained by photo-electric conversion of the corresponding optical signal; the second combiner 209 is configured to extract the analog signal and the radio frequency signal from the converted corresponding analog signal; the second filter 210 is configured to perform a second filtering process on the extracted analog signal; the demodulator 211 is configured to demodulate the analog signal after the second filtering process into a digital signal.

[0068] It should be noted that in the translation of the text related to the figure number in item , since the figure number is not provided in the original text, it is marked as [FIG. number not provided in the original] in the translation. The same applies to the figure number-related content in item and item . Please adjust it according to the actual figure number in the original text.In the embodiments of the present application, through the first ROF, the multiplexed analog signal can be converted into a corresponding optical signal by using the ROF technology, and through the second ROF module, the optical signal obtained through the first ROF module can be converted into a corresponding analog signal.

[0069] Figure 4 Yes Figure 3 is a schematic diagram of the working principle of the modulator shown in Figure 4 As shown, the signal transmission system may further include: a first control unit 212 and a clock generator 213.

[0070] Among them, the first control unit 212 is used to generate the control signals required by the communication system, usually generated by an FPGA chip or a signal processor; the clock generator 213 is used to generate a first clock signal, and the first clock signal is a carrier signal for signal modulation. The modulator is used to modulate the digital signal into an analog signal within a predetermined frequency range by using the generated first clock signal.

[0071] In Figure 4 , the clock generator 213 can be used to generate the carrier signal (i.e., the first clock signal) required for the modulation signal. The modulator 201 can be implemented as a switching switch. The modulator 201 receives the digital signal, and by controlling the switching switch with the carrier signal required for the modulation signal, the digital signal is modulated onto the carrier signal and then transmitted through the ROF system.

[0072] Through Figure 4 As can be seen from the working principle of the modulator shown in

[0073] Figure 5 Yes Figure 3 is a schematic diagram of the working principle of converting multiple analog signals into optical signals in the signal transmission system shown in Figure 5 As can be seen, when the first filter 202 filters the analog signal, it can be used to filter out frequency components other than the analog signal. When filtering the radio frequency signal 2, it can be used to filter out frequency components other than the radio frequency signal 2;...; and so on. When filtering the radio frequency signal n, it can be used to filter out frequency components other than the radio frequency signal n.

[0074] In some embodiments, the first filter 202 can be implemented as different filters, such as filter 2021 (not shown in the figure), filter 2022 (not shown in the figure),..., filter 202n (not shown in the figure), where n is an integer greater than or equal to 1. Exemplarily, filter 2021 can be used to filter out frequency components other than the analog signal; filter 2022 filters the radio frequency signal 1 and is used to filter out frequency components other than the radio frequency signal 1;...; and so on, filter 202n is used to filter the radio frequency signal n and is used to filter out frequency components other than the radio frequency signal n.

[0075] The first combiner 203, i.e., the different-frequency combiner, can be used to combine the low-frequency signal, radio frequency signals 1 to n. This combiner has an inhibitory effect on signals in other frequency bands; the signal transmitter 205 is used to transmit the optical signal obtained by converting the analog signal, so as to be transmitted through the optical fiber.

[0076] Through Figure 5 the working principle of converting multiple-channel analog signals into optical signals, after filtering the analog signal output by the modulator and filtering the existing radio frequency signals, the filtered analog signal and the filtered radio frequency signal are combined and transmitted together in the first ROF module, so as to convert the combined analog signal into an optical signal and transmit it through the optical fiber.

[0077] Figure 6 is Figure 3 a schematic diagram of the working principle of converting the optical signal into multiple-channel analog signals in the signal transmission system shown.

[0078] As Figure 6 shown, the signal receiver 207 can be used to receive the corresponding optical signal transmitted by the optical fiber and perform optoelectronic conversion to obtain the corresponding analog signal; the second combiner 209 is used to extract the analog signal and the radio frequency signal from the converted analog signal. Exemplarily, the second combiner 209 can be a different-frequency combiner.

[0079] The second filter 210 is used to filter the analog signal and each radio frequency signal output by the second combiner 209. When filtering the analog signal, it can be used to filter out the harmonic and intermodulation components generated by the signal transmitter 205 and the signal receiver 207 in the analog signal; when filtering each radio frequency signal, it can be used to filter out the harmonic and intermodulation components generated by the signal transmitter 205 and the signal receiver 207 in each radio frequency signal.

[0080] In one embodiment, the second filter 210 may be implemented as different filters, such as a low-pass filter 2101 (not shown in the figure), a filter 2102 (not shown in the figure),..., a filter 210n (not shown in the figure), where n is an integer greater than or equal to 1. In the embodiments of the present application, the filter for filtering the analog signal may be a low-pass filter.

[0081] Exemplarily, the filter 2101 can be used to filter out the harmonic and intermodulation components generated by the signal transmitter 205 and the signal receiver 207 in the extracted analog signal; the filter 2102 can be used to filter out the harmonic and intermodulation components generated by the signal transmitter 205 and the signal receiver 207 in the radio frequency signal 1;...; and so on, the filter 210n can be used to filter out the harmonic and intermodulation components generated by the signal transmitter 205 and the signal receiver 207.

[0082] The demodulator 211 is used to demodulate the analog signal filtered by the second filter 210 into a digital signal.

[0083] Through Figure 6 the working principle of converting the optical signal into multiple analog signals, it can be known that after the combined analog signal is converted into an optical signal and transmitted through the optical fiber, the ROF module is used to convert the optical signal into the corresponding radio frequency signal and analog signal. After extraction by the combiner and the filter, the radio frequency signal and the analog signal are respectively extracted, and then the extracted analog signal is demodulated into a digital signal by the demodulator, so as to realize the transmission of the digital-analog hybrid signal and achieve the effect of reducing the system design cost.

[0084] Figure 7 The structural schematic diagram of the transmission link of the communication system according to the embodiments of the present application is shown. Figure 7 And Figure 2 、 Figure 3 And Figure 4 The same or equivalent structures as those in

[0085] In Figure 7In the radio frequency signal transmission of the shown signal transmission system, the clock generator 213 is further configured to generate a second clock signal, and the second clock signal and the first clock signal are clock signals generated by the same clock generator and having different frequencies; the first combiner 203 is further configured to perform a combining process on the pre-generated second clock signal, the modulated analog signal, and the radio frequency signal to be transmitted to obtain a combined analog signal; the second combiner 209 is further configured to extract the second clock signal, the analog signal, and the radio frequency signal from the converted analog signal; the second filter is configured to perform a first filtering process on the second clock signal, the modulated analog signal, and the radio frequency signal to be transmitted; the first combiner 203 is further configured to perform a combining process on the second clock signal, the analog signal, and the radio frequency signal after the first filtering process to obtain a combined analog signal.

[0086] Continuing to refer Figure 7 , in one embodiment, the mixer 214 is configured to mix the extracted second clock signal and the extracted radio frequency signal to perform an up-conversion process on the extracted radio frequency signal to obtain a corresponding radio signal; the signal amplifier 215 is configured to perform a signal amplification process on the radio signal; the antenna 216 is configured to transmit the radio signal after the signal amplification process.

[0087] In one embodiment, in the radio frequency signal transmission of the signal transmission system, the second filter 210 is configured to perform a second filtering process on the extracted second clock signal and the extracted radio frequency signal; the mixer 214 is further configured to mix the second clock signal after the second filtering process and the radio frequency signal after the second filtering process to obtain a corresponding radio signal.

[0088] Through Figure 7 the description, it can be seen that in the schematic diagram of the structure of the transmission link of the communication system, after converting the digital signal generated by the control unit into an analog signal of a specified frequency, then combining the analog signal of the specified frequency and the radio frequency signal to be transmitted to generate a combined signal to transmit the combined signal in the ROF module, the transmission of the digital-analog hybrid signal can be realized, and the effects of simplifying the circuit and reducing the design cost can be achieved.

[0089] It should be clear that the present invention is not limited to the specific configurations and processes described in the above embodiments and shown in the figures. For the convenience and brevity of description, the detailed descriptions of other modules and devices are omitted here, and the specific working processes of the systems, modules, and units described above can refer to the corresponding processes in the foregoing method embodiments, which will not be elaborated here.

[0090] Figure 8 Shown Figure 7 is a schematic flowchart of the signal transmission method in the transmission link of the communication system shown in. As Figure 8As shown, the signal transmission method may include the following steps.

[0091] S501, the first FPGA chip generates the control signals required by the communication system, transmits the control signals to the modulator, and the modulator modulates the control signals into analog signals within a predetermined frequency range.

[0092] S502, the clock generator generates a first clock signal and a second clock signal. The first clock signal is used as the carrier of the digital signal for the modulator, and the second clock signal is transmitted for use by the upconverter.

[0093] In steps S501 - S502, the modulator is implemented by a fast-switching switch. The digital signals generated by the FPGA serve as the control signals of the switching switch, and the clock signals generated by the clock generator serve as the carrier signals of the switching switch.

[0094] S503, the first filter filters the clock signals, radio frequency signals, and analog signals to reduce the harmonic components of the signals.

[0095] S504, the heterodyne combiner combines the filtered clock signals, radio frequency signals, and analog signals.

[0096] In this step, the heterodyne combiner has an inhibitory effect on the spectral components other than the clock signals, radio frequency signals, and analog signals to reduce the interference signals from entering the combiner.

[0097] S505, the first ROF module converts the combined analog signal into an optical signal.

[0098] In this step, the optical signal obtained by the electro-optical conversion can be transmitted by the signal transmitter to achieve the conversion from the analog signal to the optical signal, thereby realizing the transmission of the signal in the optical fiber.

[0099] S506, the second ROF module converts the corresponding optical signal into an analog signal.

[0100] In this step, the analog signal obtained by the opto-electronic conversion can be received by the signal receiver to achieve the conversion from the optical signal to the analog signal.

[0101] S507, after the analog signal output by the second ROF module passes through the heterodyne combiner, the clock signals, radio frequency signals, and analog signals are extracted.

[0102] S508, the extracted clock signals, radio frequency signals, and analog signals are filtered by the filter to filter out the harmonics and intermodulation components generated by the first ROF module and the second ROF module.

[0103] S509, the filtered analog signal is demodulated by the demodulator to generate digital signals, and the digital signals are processed by the FPGA to achieve the transmission of the control signals.

[0104] S510. The radio frequency signal and the clock signal are mixed by a mixer to achieve up-conversion, obtaining a millimeter-wave signal.

[0105] S511. The millimeter-wave signal is amplified by an amplifier and then radiated by an antenna to transmit the obtained radio signal.

[0106] Through the above steps S501 to S511, in the transmission link of the communication system, the digital signal is first converted into an analog signal, and then the analog signal and the existing radio frequency signal are transmitted together. The implementation is simple, the circuit is reliable and effective, the cost is low, and it has great practical value.

[0107] Figure 9 The schematic structural diagram of the transmission link of the communication system according to the embodiment of the present application is shown. Figure 9 and Figure 2 、 Figure 3 and Figure 4 The same or equivalent structures are labeled with the same reference numerals as those in

[0108] In Figure 9 if the predetermined digital signal is the digital signal of the receiving channel, the signal transmission system can receive a radio signal, such as a millimeter-wave radio signal, through the antenna 216.

[0109] In one embodiment, the signal transmission system further includes: a signal amplifier 215 for amplifying the radio signal received through the antenna to obtain an amplified radio signal; a mixer 214 for mixing the amplified radio signal with a pre-generated second clock signal to perform down-conversion processing on the amplified radio signal to obtain a radio frequency signal to be transmitted.

[0110] In one embodiment, the signal transmission system further includes: a second filter 210 for performing second filtering processing on the extracted radio frequency signal; an analog-to-digital converter 219 for digitally sampling the radio frequency signal after the second filtering processing to obtain a digitally sampled radio frequency signal.

[0111] In one embodiment, the signal transmission system further includes: a second control module 220 for performing logical processing on the demodulated digital signal to obtain a logically processed digital signal. As an example, the second control module 220 can be implemented as a digital-to-analog converter (DAC).

[0112] In the transmitting link of a communication system and in the receiving link of the communication system, a modulator, a combiner, and a demodulator are used. In a communication system based on ROF technology, a digital signal is converted into an analog signal within a predetermined frequency range, and then this analog signal is transmitted together with an existing radio frequency signal. It is simple to implement, the circuit is reliable and effective, the cost is low, and it has great practical value.

[0113] It should be clear that the present invention is not limited to the specific configurations and processes described in the above embodiments and shown in the figures. For the convenience and brevity of description, the detailed descriptions of other modules and devices are omitted here, and for the specific working processes of the systems, modules, and units described above, reference can be made to the corresponding processes in the foregoing method embodiments, which will not be elaborated here.

[0114] Figure 10 Shown Figure 9 is a schematic flowchart of a signal transmission method in the receiving link of a communication system. As Figure 10 shown, the signal transmission method may include the following steps.

[0115] S601, The millimeter-wave radio signal is received by the antenna and transmitted to the amplifier for signal amplification.

[0116] S602, The millimeter-wave signal and the clock signal are mixed by the mixer to achieve down-conversion and generate a radio frequency signal.

[0117] S603, The first FPGA chip generates the control signals required by the communication system, transmits the control signals to the modulator, and the modulator modulates the control signals into analog signals within a predetermined frequency range.

[0118] S604, The clock generator generates a first path of clock signal and a second clock signal. The first path of clock signal is used as the carrier of the digital signal for the modulator, and the second clock signal is down-converted by the mixer.

[0119] In this embodiment, the modulator is implemented by a fast-switching switch. The digital signal generated by the FPGA serves as the control signal of the switching switch, and the clock signal generated by the clock signal generator serves as the carrier signal of the switching switch.

[0120] S605, The filter filters the radio frequency signal and the analog signal to reduce the harmonic components of the signal.

[0121] S606, The heterodyne combiner combines the radio frequency signal and the analog signal.

[0122] In this step, the heterodyne combiner has an inhibitory effect on the spectral components other than the radio frequency signal and the analog signal to reduce the interference signals from entering the combiner.

[0123] S607, The first ROF module converts the corresponding analog signal into an optical signal.

[0124] In this step, the optical signal obtained by electro-optical conversion can be transmitted through a signal transmitter to achieve the conversion from an analog signal to an optical signal, thereby realizing the transmission of the signal in an optical fiber.

[0125] In this step, the conversion from an analog signal to an optical signal is achieved, thereby realizing the transmission of the signal in an optical fiber.

[0126] S608, The second ROF module converts the corresponding optical signal into an analog signal.

[0127] In this step, the analog signal obtained by photoelectric conversion can be received through a signal receiver.

[0128] In this step, the conversion from an optical signal to an analog signal is achieved.

[0129] S609, After the analog signal output by the second ROF module passes through a heterodyne combiner, the radio frequency signal and the analog signal are extracted.

[0130] S610, The extracted radio frequency signal and analog signal are filtered through a filter to filter out the harmonics and intermodulation components generated by the first ROF module and the second ROF module.

[0131] S611, The filtered analog signal is demodulated by a demodulator to generate a digital signal, and the digital signal is processed by an FPGA to achieve the transmission of the control signal.

[0132] S612, The radio frequency signal is sampled by an ADC to transmit the sampled radio frequency signal.

[0133] Through the above steps S601 to S612, in the receiving link of the communication system, a modulator, a combiner, and a demodulator are used. In a communication system based on ROF technology, a digital signal is converted into an analog signal, and then the analog signal and the existing radio frequency signal are transmitted together.

[0134] The signal transmission method and system of the embodiments of the present application are a great supplement and improvement to the application of ROF technology, with simple implementation, reliable and effective circuits, low cost, and great practical value.

[0135] It should be clear that the present invention is not limited to the specific configurations and processes described and illustrated in the above embodiments. For the convenience and brevity of description, the detailed description of known methods is omitted here, and the specific working processes of the systems, modules, and units described above can refer to the corresponding processes in the foregoing method embodiments, which will not be elaborated here.

[0136] Figure 11 It is a structural diagram showing an exemplary hardware architecture of a computing device capable of implementing the signal transmission method according to the embodiments of the present invention.

[0137] As shown Figure 11 in FIG. 0, the computing device 700 includes an input device 701, an input interface 702, a central processing unit 703, a memory 704, an output interface 705, and an output device 706. Among them, the input interface 702, the central processing unit 703, the memory 704, and the output interface 705 are interconnected through a bus 710. The input device 701 and the output device 706 are respectively connected to the bus 710 through the input interface 702 and the output interface 705, and then connected to other components of the computing device 700.

[0138] Specifically, the input device 701 receives input information from the outside and transmits the input information to the central processing unit 703 through the input interface 702; the central processing unit 703 processes the input information based on computer-executable instructions stored in the memory 704 to generate output information, temporarily or permanently stores the output information in the memory 704, and then transmits the output information to the output device 706 through the output interface 705; the output device 706 outputs the output information to the outside of the computing device 700 for user use.

[0139] In one embodiment, Figure 11 the computing device shown in FIG. 0 can be implemented as a network device, which may include: a memory configured to store a program; a processor configured to run the program stored in the memory to execute the signal transmission method described in the above embodiment.

[0140] The above is only an exemplary embodiment of the present application and is not used to limit the protection scope of the present application. Generally, various embodiments of the present application can be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. For example, some aspects can be implemented in hardware, while other aspects can be implemented in firmware or software that can be executed by a controller, a microprocessor, or other computing devices, although the present application is not limited thereto.

[0141] Embodiments of the present application can be implemented by a data processor of a mobile device executing computer program instructions, for example, in a processor entity, or by hardware, or by a combination of software and hardware. The computer program instructions can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages.

[0142] Any block diagram of a logical process in the accompanying drawings of this application may represent program steps, or may represent interconnected logical circuits, modules, and functions, or may represent a combination of program steps and logical circuits, modules, and functions. A computer program may be stored in a memory. The memory may be of any type suitable for the local technical environment and may be implemented using any suitable data storage technology, such as but not limited to read-only memory (ROM), random access memory (RAM), optical memory devices and systems (Digital Versatile Disc DVD or CD-ROM), etc. A computer-readable medium may include a non-transitory storage medium. The data processor may be of any type suitable for the local technical environment, such as but not limited to general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), and processors based on multi-core processor architectures.

[0143] By way of illustrative and non-limiting examples, a detailed description of exemplary embodiments of the present application has been provided above. However, various modifications and adaptations of the above embodiments will be apparent to those skilled in the art upon consideration of the accompanying drawings and the claims, without departing from the scope of the invention. Accordingly, the proper scope of the invention will be determined in accordance with the claims.

Claims

1. A signal transmission method, characterized in that, The method includes: Modulating a predetermined digital signal into an analog signal within a predetermined frequency range; Combining the modulated analog signal with the radio frequency signal to be transmitted to obtain a combined analog signal; Transmitting, through a signal transmitter, the corresponding optical signal obtained by electro-optic conversion of the combined analog signal, and receiving, through a signal receiver, the corresponding analog signal obtained by photoelectric conversion of the corresponding optical signal; Extracting the analog signal and the radio frequency signal from the converted analog signal; Demodulating the extracted analog signal into a digital signal to transmit the demodulated digital signal; Wherein, if the digital signal is a digital signal of the transmitting channel, the combined analog signal and the signal extracted from the converted analog signal both include: a second clock signal; After extracting the second clock signal, the analog signal, and the radio frequency signal from the converted analog signal, the method further includes: Mixing the extracted second clock signal and the extracted radio frequency signal to perform up-conversion processing on the extracted radio frequency signal to obtain a corresponding radio signal; Performing signal amplification processing on the radio signal; Transmitting the radio signal after the signal amplification processing; Wherein, if the predetermined digital signal is a digital signal of the receiving channel, before combining the modulated analog signal with the radio frequency signal to be transmitted, the method further includes: Performing signal amplification processing on the radio signal received through the antenna to obtain a radio signal after the signal amplification processing; Mixing the radio signal after the signal amplification processing with a pre-generated second clock signal to perform down-conversion processing on the amplified radio signal to obtain the radio frequency signal to be transmitted.

2. The method according to claim 1, wherein The combining the modulated analog signal with the radio frequency signal to be transmitted to obtain a combined analog signal includes: Performing first filtering processing on the modulated analog signal and the radio frequency signal to be transmitted; Performing combining processing on the filtered analog signal and radio frequency signal to obtain the combined analog signal.

3. The method according to claim 1, characterized in that, The demodulating the extracted analog signal into a digital signal includes: Performing second filtering processing on the extracted analog signal; Demodulating the analog signal after the second filtering processing into a digital signal.

4. The method according to claim 1, characterized in that, The modulating the predetermined digital signal into an analog signal within a predetermined frequency range includes: modulating the digital signal into an analog signal within a predetermined frequency range by using a first clock signal, and the first clock signal is a pre-generated carrier signal for signal modulation.

5. The method according to claim 4, characterized in that, The combining the modulated analog signal with the radio frequency signal to be transmitted to obtain a combined analog signal includes: performing combining processing on a pre-generated second clock signal, the modulated analog signal, and the radio frequency signal to be transmitted to obtain a combined analog signal, wherein the second clock signal and the first clock signal are clock signals with different frequencies generated by the same clock generator; Extracting an analog signal and a radio frequency signal from the converted analog signal includes: extracting a second clock signal, an analog signal, and a radio frequency signal from the converted analog signal.

6. The method according to claim 5, characterized in that, Performing a combining process on the pre-generated second clock signal, the modulated analog signal, and the radio frequency signal to be transmitted to obtain a combined analog signal includes: After performing a first filtering process on the second clock signal, the modulated analog signal, and the radio frequency signal to be transmitted, combining the second clock signal, the analog signal, and the radio frequency signal after the first filtering process to obtain a combined analog signal.

7. The method according to claim 1, characterized in that Mixing the extracted second clock signal and the extracted radio frequency signal to perform an up-conversion process on the extracted radio frequency signal to obtain a corresponding radio signal includes: Performing a second filtering process on the extracted second clock signal and the extracted radio frequency signal; Mixing the second clock signal after the second filtering process and the radio frequency signal after the second filtering process to obtain a corresponding radio signal.

8. The method according to any one of claims 1 to 4, characterized in that If the predetermined digital signal is a digital signal of a receiving channel, after extracting the analog signal and the radio frequency signal from the converted analog signal, the method further includes: Performing a second filtering process on the extracted radio frequency signal; Digitally sampling the radio frequency signal after the second filtering process to obtain the digitally sampled radio frequency signal.

9. The method according to any one of claims 1 to 4, characterized in that, If the predetermined digital signal is a digital signal of a receiving channel, then after demodulating the extracted analog signal into a digital signal, the method further includes: Performing a logic processing on the demodulated digital signal, the digitally processed digital signal.

10. A signal transmission system, characterized in that The system includes: A modulator for modulating a predetermined digital signal into an analog signal within a predetermined frequency range; A first combiner for combining the modulated analog signal and the radio frequency signal to be transmitted to obtain a combined analog signal; A signal transmitter for transmitting a corresponding optical signal obtained by electro-optic conversion of the combined analog signal; A signal receiver for receiving a corresponding analog signal obtained by photo-electric conversion of the corresponding optical signal; A second combiner for extracting an analog signal and a radio frequency signal from the converted analog signal; A demodulator for demodulating the extracted analog signal into a digital signal to transmit the demodulated digital signal; Wherein, if the digital signal is a digital signal of a transmitting channel, the combined analog signal and the signal extracted from the converted analog signal both include: a second clock signal; The system further includes: A mixer for mixing the extracted second clock signal and the extracted radio frequency signal to perform an up-conversion process on the extracted radio frequency signal to obtain a corresponding radio signal; A signal amplifier for amplifying the radio signal; An antenna for transmitting the radio signal after the signal amplification process; Wherein, if the predetermined digital signal is a digital signal of a receiving channel, the system further includes: A signal amplifier for amplifying a radio signal received through an antenna to obtain an amplified radio signal; A mixer for mixing the amplified radio signal with a pre-generated second clock signal to down-convert the amplified radio signal and obtain a radio frequency signal to be transmitted.

11. The system according to claim 10, wherein The system further includes: A first filter for performing a first filtering process on the modulated analog signal and the radio frequency signal to be transmitted; The first combiner is further configured to combine the filtered analog signal and the radio frequency signal to obtain the combined analog signal.

12. The system according to claim 10, wherein The system further includes: A second filter for performing a second filtering process on the extracted analog signal; A demodulator for demodulating the second-filtered analog signal into a digital signal.

13. The system according to claim 10, characterized in that, The system further includes: A clock generator for generating a first clock signal, which is a carrier signal for signal modulation; The modulator is further configured to modulate the digital signal into an analog signal within a predetermined frequency range by using the generated first clock signal.

14. The system according to claim 13, characterized in that, The system further includes: The clock generator is further configured to generate a second clock signal, and the second clock signal and the first clock signal are clock signals with different frequencies generated by the same clock generator; The first combiner is further configured to combine the pre-generated second clock signal, the modulated analog signal, and the radio frequency signal to be transmitted to obtain a combined analog signal; The second combiner is further configured to extract the second clock signal, the analog signal, and the radio frequency signal from the converted analog signal.

15. The system according to claim 14, wherein The system further includes: A second filter for performing a first filtering process on the second clock signal, the modulated analog signal, and the radio frequency signal to be transmitted; The first combiner is further configured to combine the second clock signal, the analog signal, and the radio frequency signal after the first filtering process to obtain a combined analog signal.

16. The system according to claim 10, wherein The system further includes: A second filter for performing a second filtering process on the extracted second clock signal and the extracted radio frequency signal; The mixer is further configured to mix the second-filtered second clock signal and the second-filtered radio frequency signal to obtain a corresponding radio signal.

17. The system according to any one of claims 10 to 13, characterized in that, If the predetermined digital signal is the digital signal of the receiving channel, the system further includes: A second filter for performing a second filtering process on the extracted radio frequency signal; An analog-to-digital converter ADC for digitally sampling the second-filtered radio frequency signal to obtain the digitally sampled radio frequency signal.

18. The system according to any one of claims 10 to 13, characterized in that, If the predetermined digital signal is the digital signal of the receiving channel, the system further includes: A control unit for performing a logic processing on the demodulated digital signal to obtain a logically processed digital signal.

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