CN112468232B - Control signal transmission system and method - Google Patents
Control signal transmission system and method Download PDFInfo
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- CN112468232B CN112468232B CN202011270693.8A CN202011270693A CN112468232B CN 112468232 B CN112468232 B CN 112468232B CN 202011270693 A CN202011270693 A CN 202011270693A CN 112468232 B CN112468232 B CN 112468232B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
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- H04B10/5167—Duo-binary; Alternative mark inversion; Phase shaped binary transmission
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Abstract
The application discloses a control signal transmission system and a control signal transmission method. The system comprises a first device, a second device and a third device, wherein the first device is used for modulating a corresponding preset radio frequency signal according to at least one received control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal so as to obtain a combined radio frequency signal; and sending the data to the optical fiber transmission link; the second device is used for receiving optical signals through the optical fiber transmission link; performing photoelectric conversion on the optical signal to obtain a combined radio frequency signal; acquiring at least one radio frequency carrier signal sequence in the combined radio frequency signal; acquiring a level signal sequence corresponding to each radio frequency carrier signal sequence according to the current signal power of each radio frequency carrier signal sequence; and comparing each level signal in the level signal sequence with the corresponding preset discrimination voltage to obtain a control signal corresponding to the radio frequency carrier signal sequence. The system realizes the transmission of various control signals and solves the problem that the traditional GPS has high cost for acquiring uplink and downlink time sequence control signals.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a control signal transmission system and method.
Background
The optical fiber communication system uses light as a carrier wave, and realizes signal communication through photoelectric conversion and electro-optical conversion. As shown in fig. 1, a basic fiber optic communication system consists of three major components: optical transmitter, optical fiber cable, optical receiver.
The optical transmitter is used to implement electrical/optical conversion. It consists of a light source and a modulator. The function is to modulate the light wave emitted by the light source with the electric signal to form modulated light signal, and inject the light signal into the optical fiber or optical cable to transmit to the maximum extent by using the coupling technology. Wherein the optical fiber or optical cable constitutes a transmission path of light. The optical receiver is used to implement optical/electrical conversion. It consists of a photodetector and an optical amplifier. The function of the optical fiber cable is to convert the optical signal output by the optical fiber cable, which is distorted and attenuated, into an electrical signal, then to restore the weak electrical signal to an electrical signal before transmission after amplification and processing by an amplifier, and to output the restored electrical signal.
Communication between far-end equipment and near-end equipment in an analog optical transmission system can be realized by adopting optical fiber communication, and currently, the analog optical transmission system mainly has a Frequency Division Duplex (FDD) mode and a Time Division Duplex (TDD) mode. In the TDD mode, uplink and downlink timing synchronization switching of near-far end devices needs to be realized, and the near-end device needs to control the far-end uplink gain according to the received signal power, and perform energy-saving switch control management on a far-end power supply.
Because the TDD mode transceiver shares a radio frequency point, and the uplink and downlink link use different time slots for communication, when the analog optical transmission system works in the TDD mode, to implement communication between the far-end device and the near-end device, high-precision uplink and downlink timing synchronization (function switching such as deletion) between the far-end device and the near-end device is required. For example, to send a message to a far-end device, the near-end device needs to switch downlink communication, and the far-end device needs to be informed to perform an operation of switching downlink communication. Conventionally, a GPS module is integrated in the remote device, and the GPS module collects a control signal for switching downlink communication.
However, the above scheme needs to be completed by a GPS module, and the cost is high.
Disclosure of Invention
Embodiments of the present application provide a control signal transmission system and method, which solve the above problems in the prior art, so as to reduce the cost of an analog optical transmission system.
In a first aspect, a control signal transmission system is provided, which may include: the device comprises a first device, a second device and an optical fiber transmission link; the first equipment is connected with a first end of the optical fiber transmission link, and the second equipment is connected with a second end of the optical fiber transmission link;
the first device is used for receiving at least one control signal, and each control signal is used for controlling the second device to execute corresponding operation; modulating corresponding preset radio frequency signals according to each control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal; the signal frequency of the preset radio frequency signal corresponding to each control signal is different; the radio frequency carrier signal sequence comprises at least one radio frequency carrier signal arranged according to a time sequence; then, acquiring a combined radio frequency signal of the radio frequency carrier signal sequence corresponding to each control signal and a preset main radio frequency signal; and sending the optical signal after the electro-optical conversion of the combined radio frequency signal to an optical fiber transmission link;
the second device is configured to receive the optical signal sent by the first device through the optical fiber transmission link; performing photoelectric conversion on the optical signal to obtain the combined radio frequency signal; screening the combined radio-frequency signal according to a frequency screening mode to obtain at least one radio-frequency carrier signal sequence; aiming at each radio frequency carrier signal sequence, acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the current signal power of the radio frequency carrier signal sequence; and comparing each level signal in the level signal sequence with a corresponding preset discrimination voltage to obtain a control signal corresponding to the radio frequency carrier signal sequence.
In an alternative implementation, the first device includes at least one branch corresponding to the at least one first control signal, a combiner, and an electrical-to-optical converter, where each branch includes a sine wave signal generator and a binary on-off keying OOK modulator;
the output end of the sine wave signal generator in each branch is connected with the first input end of the OOK modulator, and the output ends of the OOK modulators in each branch in the at least one branch are intersected at an intersection point; the input end of the combiner is connected with the intersection point, the output end of the combiner is connected with the input end of the electro-optical converter, and the output end of the electro-optical converter is the output end of the first device and is connected with the first end of the optical fiber transmission link;
the sine wave signal generator in each branch is used for outputting a preset radio frequency signal of a sine wave with a preset signal frequency and outputting the preset radio frequency signal to the OOK modulator;
the OOK modulator in each branch is configured to receive a control signal and a corresponding preset radio frequency signal of the corresponding branch, and modulate the corresponding preset radio frequency signal according to each control signal to obtain a radio frequency carrier signal sequence corresponding to each first control signal; the signal frequencies of the preset radio frequency signal sequences corresponding to the control signals in each branch are different;
the combiner is configured to couple a radio frequency carrier signal sequence output by the OOK modulator in each branch with a preset main radio frequency signal to obtain a combined radio frequency signal, and output the combined radio frequency signal to the electro-optical converter;
the electro-optical converter is used for performing electro-optical conversion on the combined radio frequency signal to obtain an optical signal and outputting the optical signal to the optical fiber transmission link.
In an alternative implementation, the second device comprises at least one branch corresponding to the at least one first control signal and an optical-to-electrical converter, each branch comprising a signal filter, a power detector and a high-speed comparator;
wherein the input end of the photoelectric converter is connected with the second end of the optical fiber transmission link; the output end of the photoelectric converter is connected with the input end of a signal filter in each branch of the at least one branch, the output end of the signal filter is connected with the input end of the power detector, the output end of the power detector is connected with the first input end of the high-speed comparator, a second input end of the high-speed comparator inputs a preset discrimination voltage, and the output end of the high-speed comparator is the output end of the second device;
the photoelectric converter is used for receiving the optical signal transmitted by the optical fiber transmission link and performing photoelectric conversion on the optical signal to obtain the combined radio frequency signal;
the signal filter in each branch is used for filtering a radio frequency carrier signal sequence with a corresponding preset signal frequency in the combined radio frequency signal of the corresponding branch to obtain a radio frequency carrier signal sequence with the preset signal frequency in each branch, and outputting the radio frequency carrier signal sequence to the power detector in the corresponding branch;
the power detector in each branch is used for acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the signal power of the radio frequency carrier signal in the radio frequency carrier signal sequence of the corresponding branch; the level signal sequence comprises a level signal corresponding to the signal power of each radio frequency carrier signal in the radio frequency carrier signal sequence, and the signal power of each radio frequency carrier signal is the same;
and the high-speed comparator in each branch is used for comparing each level signal in the level signal sequence of the corresponding branch with a preset discrimination voltage and outputting a control signal corresponding to the level signal sequence.
In an optional implementation, a signal frequency of a radio frequency carrier signal sequence corresponding to the first control signal in each branch is the same as a signal frequency of a corresponding preset radio frequency signal; and the difference between the signal frequency of the main radio frequency signal and the signal frequency of the radio frequency carrier signal is greater than a preset isolation frequency.
In an optional implementation, the OOK modulator in each branch is specifically configured to modulate a time sequence of a preset radio frequency signal according to a time sequence of each control signal by using a binary on-off keying OOK modulation manner, so as to obtain a radio frequency carrier signal sequence corresponding to each control signal.
In an optional implementation, the power detector in each branch is specifically configured to calculate, according to the signal power of each radio frequency carrier signal in the radio frequency carrier signal sequence and the loss value of the optical fiber transmission link, the current signal power of each radio frequency carrier signal;
and acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the level signal corresponding to the current signal power of each first radio frequency carrier signal.
In an optional implementation, the preset discrimination voltage is determined according to a maximum level signal and a minimum level signal in the level signal sequence.
In an optional implementation, the high-speed comparator in each branch is specifically configured to update a target level signal in the level signal sequence to a first level signal if the target level signal is greater than the corresponding preset discrimination voltage;
if the target level signal in the level signal sequence is not greater than the corresponding preset judgment voltage, updating the target level signal into a second level signal; wherein the target level signal is any level signal in the level signal sequence, and the first level signal is greater than the second level signal.
And sequencing the first level signal and the second level signal according to a time sequence to obtain a control signal corresponding to the radio frequency carrier signal sequence.
In a second aspect, a control signal transmission method is provided, which is applied in a control signal transmission system, and the method may include:
receiving at least one control signal; each control signal is used for controlling a second device of the analog optical transmission system to execute corresponding operation;
modulating corresponding preset radio frequency signals according to each control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal; the signal frequency of the preset radio frequency signal corresponding to each control signal is different; the radio frequency carrier signal sequence comprises at least one radio frequency carrier signal arranged according to a time sequence;
acquiring a combined radio frequency signal of a radio frequency carrier signal sequence corresponding to each control signal and a preset main radio frequency signal;
sending the optical signal after the electro-optical conversion of the combined radio frequency signal to an optical fiber transmission link;
receiving the optical signal through the optical fiber transmission link, and performing photoelectric conversion on the optical signal to obtain the combined radio frequency signal;
screening the combined radio-frequency signal according to a frequency screening mode to obtain at least one radio-frequency carrier signal sequence;
aiming at each radio frequency carrier signal sequence, acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the current signal power of the radio frequency carrier signal sequence;
and comparing each level signal in the level signal sequence with a corresponding preset discrimination voltage to obtain a control signal corresponding to the radio frequency carrier signal sequence.
In an optional implementation, modulating a preset radio frequency signal according to each control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal, includes:
and modulating the time sequence of a preset radio frequency signal by adopting a binary on-off keying (OOK) modulation mode according to the time sequence of each control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal, wherein the radio frequency carrier signal sequence comprises at least one radio frequency carrier signal arranged according to the time sequence.
In an optional implementation, the signal frequency of the radio frequency carrier signal sequence corresponding to each control signal is the same as the signal frequency of the corresponding preset radio frequency signal;
the difference between the signal frequency of the main radio frequency signal and the signal frequency of the radio frequency carrier signal is greater than a preset isolation frequency.
In an optional implementation, obtaining a level signal sequence corresponding to the radio frequency carrier signal sequence according to the current signal power of the radio frequency carrier signal sequence includes:
calculating the current signal power of each radio frequency carrier signal according to the signal power of each radio frequency carrier signal in the radio frequency carrier signal sequence and the loss value of the optical fiber transmission link;
and acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the level signal corresponding to the current signal power of each radio frequency carrier signal.
In an optional implementation, the preset discrimination voltage is determined according to a maximum level signal and a minimum level signal in the level signal sequence.
In an optional implementation, comparing each level signal in the level signal sequence with a corresponding preset discrimination voltage to obtain a control signal corresponding to the radio frequency carrier signal sequence includes:
if the target level signal in the level signal sequence is greater than the corresponding preset judging voltage, updating the target level signal into a first level signal;
if the target level signal in the level signal sequence is not greater than the corresponding preset judgment voltage, updating the target level signal into a second level signal; wherein the target level signal is any level signal in the level signal sequence, and the first level signal is greater than the second level signal.
And sequencing the first level signal and the second level signal according to a time sequence to obtain a control signal corresponding to the radio frequency carrier signal sequence.
In a third aspect, an electronic device is provided, which includes a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory complete communication with each other through the communication bus;
a memory for storing a computer program;
a processor adapted to perform the method steps of any of the above first aspects when executing a program stored in the memory.
In a fourth aspect, a computer-readable storage medium is provided, having stored therein a computer program which, when executed by a processor, performs the method steps of any of the above first aspects.
The first device in the control signal transmission system provided by the embodiment of the invention is used for receiving at least one control signal; modulating corresponding preset radio frequency signals according to each control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal; acquiring a radio frequency carrier signal sequence corresponding to each control signal and a combined radio frequency signal coupled with a preset main radio frequency signal; and the optical signal after the combined radio frequency signal is subjected to electro-optical conversion is sent to an optical fiber transmission link; the second device is used for receiving the optical signal sent by the device through the optical fiber transmission link; performing photoelectric conversion on the optical signal to obtain a combined radio frequency signal; screening the combined radio frequency signals according to a frequency screening mode to obtain at least one radio frequency carrier signal sequence; aiming at each radio frequency carrier signal sequence, acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the current signal power of the radio frequency carrier signal sequence; and comparing each level signal in the level signal sequence with the corresponding preset discrimination voltage to obtain a control signal corresponding to the radio frequency carrier signal sequence. The system realizes the transmission of various control signals in a TDD transmission system in a frequency division multiplexing mode, and solves the problem of high cost of acquiring uplink and downlink timing sequence control signals by the traditional GPS.
Drawings
FIG. 1 is a schematic diagram of a fiber optic communication system;
fig. 2A is a schematic diagram of a control signal transmission system according to an embodiment of the present invention;
fig. 2B is a schematic diagram of another control signal transmission system according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a control signal transmission method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without any creative effort belong to the protection scope of the present application.
The transmission method of the control signal provided by the embodiment of the invention can be applied to the control signal transmission system architecture shown in fig. 2A. The system may include at least two devices, such as a first device and a second device, communicatively coupled via a fiber optic transmission link.
Each device may be a User Equipment (UE) such as a Mobile phone, smart phone, laptop, digital broadcast receiver, personal Digital Assistant (PDA), tablet computer (PAD), handheld device, vehicle mounted device, wearable device, computing device or other processing device connected to a wireless modem, mobile Station (MS), mobile Terminal (Mobile Terminal), etc.
There are two classes of devices for each device in the system: a proximal device and a distal device.
For example, between any two devices, if the first device is a near-end device of the second device, the second device is a far-end device of the first device; correspondingly, if the first device is a far-end device of the second device, the second device is a near-end device of the first device.
As shown in fig. 2B, the near-end device may include at least one branch, a combiner, and an electrical-to-optical converter, where each branch includes a sine wave signal generator and an On-Off Keying (OOK) modulator, such as an rf switch chip.
In each branch, the output end of the sine wave signal generator is connected with the first input end of the OOK modulator, and the output ends of the OOK modulators in each branch in at least one branch are intersected at an intersection point; the input end of the combiner is connected with the intersection point, the output end of the combiner is connected with the input end of the electro-optical converter, and the output end of the electro-optical converter is the output end of the near-end equipment and is connected with the first end of the optical fiber transmission link.
And the sine wave signal generator in each branch is used for outputting a preset radio frequency signal of a sine wave with a preset signal frequency.
The preset radio frequency signals output by the sine wave signal generators on different branches have different signal frequencies, such as f1, f2 and f3. In order to have sufficient isolation from the predetermined main rf signal, the signal frequency may be between 300MHz and 500 MHz. The main rf signal is preset to be a complete rf signal, such as 4G, 5G signal. Moreover, in order to improve the transmission accuracy, the signal power of the predetermined rf signal outputted from the sine wave signal generator needs to be greater than 0dbm, where 0dbm =1mw, and dbm means db mw, which can be taken as a unit of voltage or power.
The OOK modulator in each branch is configured to modulate a preset radio frequency signal in the branch according to control signals switch-1, switch-2, and switch-3, such as a square wave signal, received by a second input terminal (or "enable terminal") of the OOK modulator, so as to obtain a radio frequency carrier signal sequence corresponding to the control signal in the branch;
the signal frequency of the radio frequency carrier signal sequence in each branch is the same as the signal frequency of a preset radio frequency signal, for example, f1, f2 and f3, and the duty ratios of the control signals in each branch are different. The radio frequency signal is a transmitted wireless signal, and the radio frequency carrier signal is communication information carried on the wireless signal, such as a signal of control signaling and user plane information. Each control signal is used for controlling the second equipment to execute corresponding operation; the operation includes, but is not limited to, switching between uplink and downlink timing, turning on and off the LNA-bypass function, and turning on and off the power saving switch.
And the combiner is used for coupling the radio frequency carrier signal sequences corresponding to the f1, f2 and f3 control signals in each branch with a preset main radio frequency signal to obtain a combined radio frequency signal.
And the electro-optical converter is used for performing electro-optical conversion on the combined radio frequency signal to obtain an optical signal and outputting the optical signal to the optical fiber transmission link.
The remote device may include an optical-to-electrical converter and at least one branch, each branch including a signal filter, such as the filter of fig. 2B, a power detector, such as the power detector of fig. 2B, and a high-speed comparator.
The input end of the photoelectric converter is connected with the second end of the optical fiber transmission link; the output end of the photoelectric converter is connected with the input end of the signal filter in each branch of the at least one branch, namely the input end of the signal filter in each branch of the at least one branch is intersected at an intersection point, the output end of the signal filter is connected with the input end of the power detector, the output end of the power detector is connected with the first input end of the high-speed comparator, the second input end of the high-speed comparator inputs the preset discrimination voltage, and the output end of the high-speed comparator is the output end of the far-end equipment.
And the photoelectric converter is used for receiving the optical signal transmitted by the optical fiber transmission link and performing photoelectric conversion on the optical signal to obtain a combined radio frequency signal.
The signal filter in each branch is configured to filter a radio frequency carrier signal sequence of a corresponding signal frequency in the combined radio frequency signal, so as to obtain a radio frequency carrier signal sequence of the branch signal frequency, such as f1, f2, and f3, respectively.
And the power detector in each branch is used for acquiring a level signal corresponding to the corresponding signal power according to the signal power of the radio-frequency carrier signal in the input radio-frequency carrier signal sequence so as to obtain a level signal sequence corresponding to the radio-frequency carrier signal sequence.
And the high-speed comparator in each branch is used for comparing each level signal in the level signal sequence with a preset discrimination voltage and outputting a control signal corresponding to the level signal sequence, namely recovering the switch-1, the switch-2 and the switch-3 received by the near-end equipment.
Therefore, the analog optical transmission system working in the TDD mode can transmit control signals of uplink and downlink timing switching, uplink gain control, power management switch, and the like of the near-end device to the far-end device with high precision based on a frequency division multiplexing mode without using a GPS module, thereby realizing control and management of the far-end device and reducing the cost of the analog optical transmission system.
In a specific implementation, in the first device:
the sine wave signal generator in each branch is used for outputting a preset radio frequency signal of sine waves with preset signal frequency and outputting the preset radio frequency signal to the OOK modulator;
the OOK modulator in each branch is used for receiving the control signal of the corresponding branch and the corresponding preset radio frequency signal, and modulating the corresponding preset radio frequency signal according to each control signal to obtain a radio frequency carrier signal sequence corresponding to each first control signal;
the preset radio frequency signal sequences corresponding to the control signals in each branch have different signal frequencies, for example, the signal frequencies of the preset radio frequency signal sequences corresponding to the three control signals are respectively 300MHz, 400MHz, and 500MHz, and the signal frequency of the radio frequency carrier signal sequence corresponding to the control signal in each branch is the same as the signal frequency of the corresponding preset radio frequency signal.
In specific implementation, the OOK modulator modulates a preset radio frequency signal in an OOK modulation manner according to the timing sequence of each control signal, so as to obtain a radio frequency carrier signal sequence corresponding to the control signal in each branch. That is, each radio frequency carrier signal sequence includes at least one radio frequency carrier signal arranged in time sequence.
The combiner is used for coupling the radio frequency carrier signal sequence output by the OOK modulator in each branch with a preset main radio frequency signal to obtain a combined radio frequency signal and outputting the combined radio frequency signal to the electro-optical converter;
the preset main radio frequency signal is a radio frequency signal for optical fiber transmission.
The combiner couples the radio frequency carrier signal sequence corresponding to the control signal in each branch with a preset main radio frequency signal respectively to obtain a coupled combined radio frequency signal.
And the electro-optical converter is used for performing electro-optical conversion on the combined radio frequency signal to obtain an optical signal and outputting the optical signal to the optical fiber transmission link.
In the second apparatus:
the photoelectric converter is used for receiving the optical signal transmitted by the optical fiber transmission link and performing photoelectric conversion on the optical signal to obtain a combined radio frequency signal;
the signal filter in each branch is used for filtering a radio frequency carrier signal sequence with corresponding preset signal frequency in the combined radio frequency signal of the corresponding branch to obtain a radio frequency carrier signal sequence with the preset signal frequency in each branch, and outputting the radio frequency carrier signal sequence to the power detector in the corresponding branch;
for example, if the signal frequencies of the radio frequency carrier signal sequences corresponding to the three control signals are 300MHz, 400MHz, and 500MHz, the second device obtains the radio frequency carrier signal sequences of 300MHz, 400MHz, and 500MHz by using signal filters of 300MHz, 400MHz, and 500MHz, respectively, and outputs the radio frequency carrier signal sequences in the corresponding branches to the power detectors in the corresponding branches.
The power detector in each branch is used for acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the signal power of the radio frequency carrier signal in the radio frequency carrier signal sequence of the corresponding branch;
the level signal sequence in each branch circuit comprises a level signal corresponding to the signal power of each radio frequency carrier signal in a corresponding radio frequency carrier signal sequence, and the signal power of each radio frequency carrier signal is the same;
the power detector in each branch circuit calculates the current signal power of each radio frequency carrier signal according to the signal power of each radio frequency carrier signal in the input radio frequency carrier signal sequence and the loss value of the optical fiber transmission link;
a power detector in each branch circuit can obtain a level signal corresponding to the current signal power of each radio frequency carrier signal according to a positive correlation algorithm, such as a proportional algorithm, between preset signal power and the level signal;
therefore, according to the level signal corresponding to the current signal power of each radio frequency carrier signal, the level signal sequence corresponding to the radio frequency carrier signal sequence is obtained.
For example, the signal powers of four radio frequency carrier signals in one radio frequency carrier signal sequence f1 are 0dBm, 0dBm and 0dBm in sequence, and the loss value of the optical fiber transmission link is 30dBm (unit is dBm), then the current signal power of each radio frequency carrier signal is-30 dBm, -30dBm and-30 dBm in sequence.
Based on the current signal power of each radio frequency carrier signal, according to a positive correlation algorithm between a preset signal power and a level signal, if the signal power is-30 dBm and corresponds to the level signal 2V, it can be obtained that the level signal corresponding to each radio frequency carrier signal is sequentially 2V, and 2V, wherein according to a time sequence, the signal power between two adjacent radio frequency carrier signals is 0 (no radio frequency carrier signal), and the corresponding level signal is 0.1V, thereby obtaining a corresponding level signal sequence: 2V, 0.1V, 2V, 0.1V and 2V.
And the high-speed comparator in each branch is used for comparing each level signal in the level signal sequence of the corresponding branch with a preset discrimination voltage and outputting a control signal corresponding to the level signal sequence.
Each level signal in the level signal sequence is compared with a corresponding preset discrimination voltage through a high-speed comparator in each branch circuit;
the preset discrimination voltage is determined according to the maximum level signal and the minimum level signal in the level signal sequence, for example, the preset discrimination voltage may be an average voltage of the maximum level signal and the minimum level signal.
If the target level signal in the level signal sequence is greater than the corresponding preset judging voltage, updating the target level signal into a first level signal;
if the target level signal in the level signal sequence is not greater than the corresponding preset discrimination voltage, updating the target level signal into a second level signal;
wherein, the first level signal is higher than the second level signal, for example, the first level signal may be a supply voltage of the high-speed comparator, and the second level signal may be a 0V voltage.
And sequencing the first level signal and the second level signal according to the time sequence to obtain a control signal corresponding to the radio frequency carrier signal sequence.
Furthermore, the second device recovers the control signal received by the first device, and executes corresponding operation according to the recovered control signal, so as to realize the control and management of the near-end device on the far-end device.
It should be noted that, in the above embodiment, the first device is a near-end device of the second device, and the second device is a far-end device of the first device, and accordingly, the first device may also be a far-end device of the second device as a functional device having the second device, and the second device may also be a near-end device of the first device as a functional device having the first device, and a specific implementation process of the embodiment of the present application is not described herein again.
The first device in the control signal transmission system provided by the embodiment of the invention is used for receiving at least one control signal; modulating corresponding preset radio frequency signals according to each control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal; acquiring a radio frequency carrier signal sequence corresponding to each control signal and a combined radio frequency signal coupled with a preset main radio frequency signal; and the optical signal after the combined radio frequency signal is subjected to electro-optical conversion is sent to an optical fiber transmission link; the second device is used for receiving the optical signal sent by the device through the optical fiber transmission link; performing photoelectric conversion on the optical signal to obtain a combined radio frequency signal; screening the combined radio frequency signals according to a frequency screening mode to obtain at least one radio frequency carrier signal sequence; aiming at each radio frequency carrier signal sequence, acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the current signal power of the radio frequency carrier signal sequence; and comparing each level signal in the level signal sequence with the corresponding preset discrimination voltage to obtain a control signal corresponding to the radio frequency carrier signal sequence. The system realizes the transmission of various control signals in a TDD transmission system in a frequency division multiplexing mode, and solves the problem of high cost of acquiring uplink and downlink time sequence control signals by the traditional GPS.
Fig. 3 is a flowchart illustrating a control signal transmission method according to an embodiment of the present invention. The embodiments of the present application will be described in detail by taking an example in which the first device is a near-end device of the second device, and the second device is a far-end device of the first device. As shown in fig. 3, the method may include:
at step 310, the first device receives at least one control signal.
The first device receives at least one control signal through an OOK modulator in at least one branch.
And step 320, the first device modulates the corresponding preset radio frequency signal according to each control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal.
Step 330, the first device obtains a combined radio frequency signal coupling the radio frequency carrier signal sequence corresponding to each control signal and a preset main radio frequency signal.
And 340, the first device sends the optical signal obtained by performing the electro-optical conversion on the combined radio frequency signal to the optical fiber transmission link.
And step 350, the second device receives the optical signal through the optical fiber transmission link, and acquires a combined signal of the optical signal after photoelectric conversion.
And 360, screening the combined radio frequency signals by the second equipment according to a frequency screening mode to obtain at least one radio frequency carrier signal sequence.
Step 370, the second device obtains a level signal sequence corresponding to each radio frequency carrier signal sequence according to the current signal power of each radio frequency carrier signal sequence.
And 380, comparing each level signal in the level signal sequence with a corresponding preset discrimination voltage by the second equipment to obtain a control signal corresponding to the radio frequency carrier signal sequence.
In the above embodiment, the first device is a near-end device of the second device, the second device is a far-end device of the first device, and accordingly, the first device is a far-end device of the second device, the second device is a near-end device of the first device, at this time, the second device may perform steps 310 to 340, and the first device may perform steps 350 to 380, which are not described herein in detail in this embodiment of the present application.
An embodiment of the present invention further provides an electronic device, as shown in fig. 4, including a processor 410, a communication interface 420, a memory 430, and a communication bus 440, where the processor 410, the communication interface 420, and the memory 430 complete mutual communication through the communication bus 440.
A memory 430 for storing computer programs;
the processor 410, when executing the program stored in the memory 430, implements the following steps:
receiving at least one control signal; each control signal is used for controlling a second device of the analog optical transmission system to execute corresponding operation;
modulating corresponding preset radio frequency signals according to each control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal; the signal frequency of the preset radio frequency signal corresponding to each control signal is different; the radio frequency carrier signal sequence comprises at least one radio frequency carrier signal arranged according to a time sequence;
acquiring a combined radio frequency signal of a radio frequency carrier signal sequence corresponding to each control signal and a preset main radio frequency signal;
sending the optical signal after the electro-optical conversion of the combined radio frequency signal to an optical fiber transmission link;
receiving the optical signal through the optical fiber transmission link, and performing photoelectric conversion on the optical signal to obtain the combined radio frequency signal;
screening the combined radio-frequency signal according to a frequency screening mode to obtain at least one radio-frequency carrier signal sequence;
aiming at each radio frequency carrier signal sequence, acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the current signal power of the radio frequency carrier signal sequence;
and comparing each level signal in the level signal sequence with a corresponding preset discrimination voltage to obtain a control signal corresponding to the radio frequency carrier signal sequence.
In an optional implementation, modulating a preset radio frequency signal according to each control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal, includes:
and modulating a preset radio frequency signal by adopting a binary on-off keying (OOK) modulation mode according to the time sequence of each control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal, wherein the radio frequency carrier signal sequence comprises at least one radio frequency carrier signal arranged according to the time sequence.
In an optional implementation, the signal frequency of the radio frequency carrier signal sequence corresponding to each control signal is the same as the signal frequency of the corresponding preset radio frequency signal;
the difference between the signal frequency of the main radio frequency signal and the signal frequency of the radio frequency carrier signal is greater than a preset isolation frequency.
In an optional implementation, obtaining a level signal sequence corresponding to the radio frequency carrier signal sequence according to the current signal power of the radio frequency carrier signal sequence includes:
calculating the current signal power of each radio frequency carrier signal according to the signal power of each radio frequency carrier signal in the radio frequency carrier signal sequence and the loss value of the optical fiber transmission link;
and acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the level signal corresponding to the current signal power of each radio frequency carrier signal.
In an optional implementation, the preset discrimination voltage is determined according to a maximum level signal and a minimum level signal in the level signal sequence.
In an optional implementation, comparing each level signal in the level signal sequence with a corresponding preset discrimination voltage to obtain a control signal corresponding to the radio frequency carrier signal sequence includes:
if the target level signal in the level signal sequence is greater than the corresponding preset judging voltage, updating the target level signal into a first level signal;
if the target level signal in the level signal sequence is not greater than the corresponding preset judgment voltage, updating the target level signal into a second level signal; wherein the target level signal is any level signal in the level signal sequence, and the first level signal is greater than the second level signal.
And sequencing the first level signal and the second level signal according to a time sequence to obtain a control signal corresponding to the radio frequency carrier signal sequence.
The aforementioned communication bus may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown, but this does not mean that there is only one bus or one type of bus.
The communication interface is used for communication between the electronic equipment and other equipment.
The Memory may include a Random Access Memory (RAM) or a Non-Volatile Memory (NVM), such as at least one disk Memory. Optionally, the memory may also be at least one memory device located remotely from the processor.
The Processor may be a general-purpose Processor, including a Central Processing Unit (CPU), a Network Processor (NP), and the like; but also Digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components.
Since the implementation and the beneficial effects of the problem solving of each device of the electronic device in the above embodiment can be realized by referring to each step in the embodiment shown in fig. 3, detailed working processes and beneficial effects of the electronic device provided by the embodiment of the present invention are not described herein again.
In yet another embodiment of the present invention, a computer-readable storage medium is further provided, which stores instructions that, when executed on a computer, cause the computer to execute the control signal transmission method described in any of the above embodiments.
In yet another embodiment, a computer program product containing instructions is provided, which when run on a computer causes the computer to perform the control signal transmission method of any of the above embodiments.
As will be appreciated by one of skill in the art, the embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, embodiments of the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
Embodiments of the present application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the true scope of the embodiments of the present application.
It is apparent that those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the embodiments of the present application and their equivalents, the embodiments of the present application are also intended to include such modifications and variations.
Claims (11)
1. A control signal transmission system, wherein the control signal transmission system is an analog optical transmission system in a time division duplex, TDD, mode, the system comprising: the device comprises a first device, a second device and an optical fiber transmission link; the first equipment is connected with a first end of the optical fiber transmission link, and the second equipment is connected with a second end of the optical fiber transmission link;
the first device is used for receiving at least one control signal, and each control signal is used for controlling the second device to execute corresponding operation; modulating corresponding preset radio frequency signals according to each control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal; the signal frequency of the preset radio frequency signal corresponding to each control signal is different; the radio frequency carrier signal sequence comprises at least one radio frequency carrier signal arranged according to a time sequence; then, acquiring a combined radio frequency signal of the radio frequency carrier signal sequence corresponding to each control signal and a preset main radio frequency signal; and sending the optical signal after the electro-optical conversion of the combined radio frequency signal to an optical fiber transmission link;
the second device comprises at least one branch corresponding to at least one control signal and a photoelectric converter; the optical-to-electrical converter of the second device is configured to receive the optical signal sent by the first device through the optical fiber transmission link; performing photoelectric conversion on the optical signal to obtain the combined radio frequency signal; each branch of the second device screens the combined radio-frequency signal according to a frequency screening mode to obtain at least one radio-frequency carrier signal sequence; aiming at each radio frequency carrier signal sequence, acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the current signal power of the radio frequency carrier signal sequence; and comparing each level signal in the level signal sequence with a corresponding preset discrimination voltage to obtain a control signal corresponding to the radio frequency carrier signal sequence.
2. The system of claim 1, wherein the first device comprises at least one branch for at least one control signal, a combiner, and an electrical-to-optical converter, each branch comprising a sine wave signal generator and a binary on-off keying (OOK) modulator;
the output end of the sine wave signal generator in each branch is connected with the first input end of the OOK modulator, and the output ends of the OOK modulators in each branch in the at least one branch are intersected at an intersection point; the input end of the combiner is connected with the intersection point, the output end of the combiner is connected with the input end of the electro-optical converter, and the output end of the electro-optical converter is the output end of the first device and is connected with the first end of the optical fiber transmission link;
the sine wave signal generator in each branch is used for outputting a preset radio frequency signal of a sine wave with a preset signal frequency and outputting the preset radio frequency signal to the OOK modulator;
the OOK modulator in each branch is configured to receive a control signal of a corresponding branch and a corresponding preset radio frequency signal, and modulate the corresponding preset radio frequency signal according to the control signal of the corresponding branch to obtain a radio frequency carrier signal sequence corresponding to the control signal of the corresponding branch; the signal frequencies of the preset radio frequency signal sequences corresponding to the control signals in each branch are different;
the combiner is configured to couple a radio frequency carrier signal sequence output by the OOK modulator in each branch with a preset main radio frequency signal to obtain a combined radio frequency signal, and output the combined radio frequency signal to the electro-optical converter;
the electro-optical converter is used for performing electro-optical conversion on the combined radio frequency signal to obtain an optical signal and outputting the optical signal to the optical fiber transmission link.
3. The system of claim 1, wherein each branch of said second device comprises a signal filter, a power detector and a high speed comparator;
wherein the input end of the photoelectric converter is connected with the second end of the optical fiber transmission link; the output end of the photoelectric converter is connected with the input end of a signal filter in each branch of the at least one branch, the output end of the signal filter is connected with the input end of the power detector, the output end of the power detector is connected with the first input end of the high-speed comparator, a second input end of the high-speed comparator inputs a preset discrimination voltage, and the output end of the high-speed comparator is the output end of the second device;
the photoelectric converter is used for receiving the optical signal transmitted by the optical fiber transmission link and performing photoelectric conversion on the optical signal to obtain the combined radio frequency signal;
the signal filter in each branch is used for filtering a radio frequency carrier signal sequence with a corresponding preset signal frequency in the combined radio frequency signal of the corresponding branch to obtain a radio frequency carrier signal sequence with the preset signal frequency in each branch, and outputting the radio frequency carrier signal sequence to the power detector in the corresponding branch;
the power detector in each branch is used for acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the signal power of the radio frequency carrier signal in the radio frequency carrier signal sequence of the corresponding branch; the level signal sequence comprises a level signal corresponding to the signal power of each radio frequency carrier signal in the radio frequency carrier signal sequence, and the signal power of each radio frequency carrier signal is the same;
and the high-speed comparator in each branch is used for comparing each level signal in the level signal sequence of the corresponding branch with a preset discrimination voltage and outputting a control signal corresponding to the level signal sequence.
4. The system according to claim 2, wherein the signal frequency of the radio frequency carrier signal sequence corresponding to the first control signal in each branch is the same as the signal frequency of the corresponding predetermined radio frequency signal; and the difference between the signal frequency of the main radio frequency signal and the signal frequency of the radio frequency carrier signal is greater than a preset isolation frequency.
5. The system according to claim 2, wherein the OOK modulator in each branch is specifically configured to modulate a preset radio frequency signal according to the timing sequence of each control signal by using a binary on-off keying OOK modulation manner, so as to obtain a radio frequency carrier signal sequence corresponding to each control signal.
6. The system according to claim 3, wherein the power detector in each branch is specifically configured to calculate a current signal power of each rf carrier signal in the sequence of rf carrier signals according to the signal power of each rf carrier signal and the loss value of the optical fiber transmission link;
and acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the level signal corresponding to the current signal power of each radio frequency carrier signal.
7. The system of claim 1, wherein the predetermined discrimination voltage is determined based on a maximum level signal and a minimum level signal in the sequence of level signals.
8. The system according to claim 3, wherein the high speed comparator in each branch is specifically configured to update a target level signal in the level signal sequence to a first level signal if the target level signal is greater than the corresponding predetermined discrimination voltage;
if the target level signal in the level signal sequence is not greater than the corresponding preset discrimination voltage, updating the target level signal into a second level signal; the target level signal is any level signal in the level signal sequence, and the first level signal is greater than the second level signal;
and sequencing the first level signal and the second level signal according to a time sequence to obtain a control signal corresponding to the radio frequency carrier signal sequence.
9. A control signal transmission method is applied to a control signal transmission system, wherein the control signal transmission system is an analog optical transmission system in a time division TDD mode, and the method comprises the following steps:
the first device receiving at least one control signal; each control signal is used for controlling a second device of the analog optical transmission system to execute corresponding operation; modulating corresponding preset radio frequency signals according to each control signal to obtain a radio frequency carrier signal sequence corresponding to each control signal; the signal frequency of the preset radio frequency signal corresponding to each control signal is different; the radio frequency carrier signal sequence comprises at least one radio frequency carrier signal arranged according to a time sequence; acquiring a combined radio frequency signal of a radio frequency carrier signal sequence corresponding to each control signal and a preset main radio frequency signal; sending the optical signal after the electro-optical conversion of the combined radio frequency signal to an optical fiber transmission link;
the second device comprises at least one branch corresponding to at least one control signal and a photoelectric converter; the photoelectric converter of the second device receives the optical signal through the optical fiber transmission link and performs photoelectric conversion on the optical signal to obtain the combined radio frequency signal; each branch of the second device screens the combined radio-frequency signal according to a frequency screening mode to obtain at least one radio-frequency carrier signal sequence; aiming at each radio frequency carrier signal sequence, acquiring a level signal sequence corresponding to the radio frequency carrier signal sequence according to the current signal power of the radio frequency carrier signal sequence; and comparing each level signal in the level signal sequence with a corresponding preset discrimination voltage to obtain a control signal corresponding to the radio frequency carrier signal sequence.
10. An electronic device, characterized in that the electronic device comprises a processor, a communication interface, a memory and a communication bus, wherein the processor, the communication interface and the memory are communicated with each other through the communication bus;
a memory for storing a computer program;
a processor for implementing the method steps of claim 9 when executing a program stored on a memory.
11. A computer-readable storage medium, characterized in that a computer program is stored in the computer-readable storage medium, which computer program, when being executed by a processor, carries out the method steps of claim 9.
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| US5745846A (en) * | 1995-08-07 | 1998-04-28 | Lucent Technologies, Inc. | Channelized apparatus for equalizing carrier powers of multicarrier signal |
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| CN102664681A (en) * | 2012-04-16 | 2012-09-12 | 广州飞瑞敖电子科技有限公司 | Radio-over-fiber switching system |
| WO2016110933A1 (en) * | 2015-01-05 | 2016-07-14 | 三菱電機株式会社 | Communication device and method for carrier frequency control |
| CN204481832U (en) * | 2015-04-02 | 2015-07-15 | 北京交通大学 | A kind of based on light comb and the ROF-PON full duplex system of carrier reuse |
| CN205081795U (en) * | 2015-11-13 | 2016-03-09 | 广西师范大学 | Wavelength devision multiplex passive optical network system based on subcarrier is multiplexing |
| EP3664324B1 (en) * | 2017-08-16 | 2022-06-01 | Huawei Technologies Co., Ltd. | Optical transmitter, optical receiver, and optical transmission method |
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