CN215897878U - CATV coaxial network-based TDD signal synchronization master-slave device and system - Google Patents
CATV coaxial network-based TDD signal synchronization master-slave device and system Download PDFInfo
- Publication number
- CN215897878U CN215897878U CN202121974551.XU CN202121974551U CN215897878U CN 215897878 U CN215897878 U CN 215897878U CN 202121974551 U CN202121974551 U CN 202121974551U CN 215897878 U CN215897878 U CN 215897878U
- Authority
- CN
- China
- Prior art keywords
- catv
- tdd
- unit
- catv coaxial
- coaxial network
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The present invention relates to communication technology. The utility model aims to provide a CATV coaxial network-based TDD signal synchronization master-slave device and a CATV coaxial network-based TDD signal synchronization master-slave system, which can solve the problem of TDD signal synchronization during CATV coaxial network transmission at present after adding corresponding processing software, and the technical scheme can be summarized as follows: the main equipment comprises a main control unit, a TDD modulation unit, a combining unit, a CATV signal input end and a first CATV coaxial communication port; the slave equipment comprises a slave equipment body, a comparator, an amplification detection circuit, a branching unit, a CATV signal output end and a second CATV coaxial communication port; the master device and the slave device are connected through a CATV coaxial network. The utility model has the advantages of easy realization and low cost, and is suitable for the TDD signal synchronization based on the CATV coaxial network.
Description
Technical Field
The utility model relates to a communication technology, in particular to a technology for synchronizing TDD signals based on a CATV coaxial network.
Background
With the increasing application of 5G technology to wireless transmission indoor products, carrier frequency is increased, and the conventional DAS (Distributed Antenna System) distribution System (indoor subsystem) has a problem that it does not support NR (New Radio, New air interface) and MIMO technology, so it needs to be improved on the basis of the original indoor DAS distribution System (indoor subsystem), and in the prior art, generally, a scheme of replacing a higher frequency splitter and combiner, a fiber-optic pulling scheme, or a digital indoor subsystem is adopted, but all the above schemes need to re-lay a line or replace equipment, resulting in high time cost and labor cost, and at present, there is a scheme of adding a master device (near-end device) and a slave device (far-end device) at both ends of the existing cable television network, and performing transmission through the existing CATV coaxial network, which solves the problems of cost and difficulty in installation, however, for a TDD (Time Division duplex) mode system, there is a problem that synchronous control is required between different units, and the existing macro station and indoor small station both use optical fiber to transmit their TDD signals, but if the scheme of transmitting TDD signals by using the optical fiber is applied to the above scheme of transmitting signals by using the existing CATV coaxial network, new problems such as increased power consumption, increased cost, and complex installation are caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a CATV coaxial network-based TDD signal synchronization master-slave device and a CATV coaxial network-based TDD signal synchronization master-slave system, which can solve the problem of TDD signal synchronization during CATV coaxial network transmission at present after corresponding processing software is added.
The technical scheme adopted by the utility model for solving the technical problems is that the CATV coaxial network-based TDD signal synchronization master device comprises a master control unit, a TDD modulation unit, a combining unit, a CATV signal input end and a first CATV coaxial communication port, wherein the master control unit is connected with one shunt end of the combining unit through the TDD modulation unit, the other shunt end of the combining unit is connected with the CATV signal input end, and the combining end of the combining unit is connected with the first CATV coaxial communication port.
Specifically, in order to provide a structure of the combiner unit, the combiner unit employs a duplexer.
Further, in order to provide a TDD modulation unit that can be implemented, the TDD modulation unit employs a radio frequency switch, the main control unit includes a TDD signal output terminal and a clock signal output terminal, a control terminal of the radio frequency switch is connected to the TDD signal output terminal of the main control unit, an input terminal of the radio frequency switch is connected to the clock signal output terminal of the main control unit, and an output terminal of the radio frequency switch is connected to a branch terminal of the combining unit.
Specifically, in order to provide a configuration of the main control unit, the main control unit at least includes a microprocessor and a clock unit, the microprocessor has a TDD signal output terminal, and the clock unit has a clock signal output terminal.
Still further, in order to provide a type of the radio frequency switch, the radio frequency switch adopts an ARW3234 type radio frequency switch; in order to provide a clock unit, the clock unit adopts a clock chip, and the clock chip adopts a clock chip of SILICON LABS with the model number of Si 5386.
The TDD signal synchronous slave device based on the CATV coaxial network comprises a slave device body, a comparator, an amplification detection circuit, a shunt unit, a CATV signal output end and a second CATV coaxial communication port, wherein the slave device body at least comprises a reference voltage output end and a control level input end, the second CATV coaxial communication port is connected with a combining end of the shunt unit, one shunt end of the shunt unit is connected with the CATV signal output end, the other shunt end of the shunt unit is connected with a positive phase input end of the comparator through the amplification detection circuit, a negative phase input end of the comparator is connected with the reference voltage output end of the slave device body, and an output end of the comparator is connected with the control level input end of the slave device body.
Specifically, in order to provide a structure of the branching unit, the branching unit employs a duplexer.
Further, in order to provide a structure of the amplification and detection circuit, the amplification and detection circuit includes an amplifier and a detector, an input end of the amplifier is used as an input end of the amplification and detection circuit, an output end of the amplifier is connected with an input end of the detector, and an output end of the detector is used as an output end of the amplification and detection circuit.
Specifically, for further explanation of the amplifier and/or the detector, the amplifier is an amplifier of model number ZD3027 in the electrical industry of beijing; the detector adopts a Maxim detector with the model number of MAX 4003; to further illustrate the comparator used, the comparator is a SGMICRO comparator, model SGM 8743.
The TDD signal synchronization system based on the CATV coaxial network comprises the TDD signal synchronization master device based on the CATV coaxial network, at least one TDD signal synchronization slave device based on the CATV coaxial network and the CATV coaxial network, wherein a first CATV coaxial communication port of the clock synchronization master device based on the CATV coaxial network is connected with a second CATV coaxial communication port of the clock synchronization slave device based on the CATV coaxial network through the CATV coaxial network.
The utility model has the beneficial effects that in the scheme of the utility model, the TDD signal synchronization master device, the TDD signal synchronization slave device and the TDD signal synchronization system based on the CATV coaxial network are provided, after corresponding processing software is added, the problem of the TDD signal synchronization of the master device and the TDD signal synchronization slave device when information is transmitted through the CATV coaxial network in the current 5G indoor distribution system can be solved, the scheme is simple and easy to realize, and the cost is low.
Drawings
Fig. 1 is a system block diagram of a CATV coaxial network-based TDD signal synchronization master device according to the present invention.
Fig. 2 is a schematic diagram of a CATV coaxial network-based TDD signal synchronization master device according to an embodiment of the present invention.
Fig. 3 is a system block diagram of the CATV coaxial network-based TDD signal synchronization slave device of the present invention.
Fig. 4 is a system block diagram of the CATV coaxial network-based TDD signal synchronization system of the present invention.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the embodiments and the accompanying drawings.
The utility model relates to a CATV coaxial network-based TDD signal synchronization master device, the system block diagram of which is shown in FIG. 1, and the device comprises a master control unit, a TDD modulation unit, a combining unit, a CATV signal input end and a first CATV coaxial communication port, wherein the master control unit is connected with one shunt end of the combining unit through the TDD modulation unit, the other shunt end of the combining unit is connected with the CATV signal input end, and the combining end of the combining unit is connected with the first CATV coaxial communication port.
After the corresponding processing software is added, the processing process is as follows: the main control unit analyzes the TDD signal from the data packet, outputs the TDD signal to the TDD modulation unit, converts the TDD signal into a TDD modulation signal, for transmission of CATV coaxial network, in this case, referring to FIG. 2, the TDD modulation unit can use a radio frequency switch, the main control unit can include a TDD signal output terminal and a clock signal output terminal, the control terminal of the radio frequency switch is connected to the TDD signal output terminal of the main control unit, the input terminal of the radio frequency switch is connected to the clock signal output terminal of the main control unit, the output terminal of the radio frequency switch is connected to one of the branch terminals of the combining unit, and thus, namely, the radio frequency switch uses the clock radio frequency signal output by the clock signal output end of the main control unit, then uses the TDD signal output by the main control unit as the control signal of the radio frequency switch to control the on-off of the clock radio frequency signal, further generating a TDD modulation signal, wherein the radio frequency switch can adopt an ARW3234 radio frequency switch; here, since the main control unit needs to output a clock rf signal and resolve a TDD signal, the main control unit may include a microprocessor and a clock unit, where the microprocessor has a TDD signal output end, the clock unit has a clock signal output end, and the clock unit may adopt an existing clock chip, for example, a clock chip with a model number of Si5386 of SILICON on LABS; then the converted TDD modulation signal is input into the combining unit, and the combining unit combines the TDD modulation signal with the CATV channel signal input by the CATV signal input end to obtain a multi-frequency signal, and outputs the multi-frequency signal to the first CATV coaxial communication port, wherein the clock radio frequency signal should select the frequency which can be extracted from the indoor distribution system and does not interfere with the transmission of other signals, and the combination of the TDD modulation signal and the CATV frequency signal can be realized by a duplexer, namely the combining unit can adopt a duplexer.
The utility model relates to a CATV coaxial network-based TDD signal synchronous slave device, a system block diagram of which is shown in figure 3, and the device comprises a slave device body, a comparator, an amplification detection circuit, a shunt unit, a CATV signal output end and a second CATV coaxial communication port, wherein the slave device body at least comprises a reference voltage output end and a control level input end, the second CATV coaxial communication port is connected with a combining end of the shunt unit, one shunt end of the shunt unit is connected with the CATV signal output end, the other shunt end of the shunt unit is connected with a positive phase input end of the comparator through the amplification detection circuit, a negative phase input end of the comparator is connected with the reference voltage output end of the slave device body, and an output end of the comparator is connected with the control level input end of the slave device body.
After the corresponding processing software is added, the processing process is as follows: the multi-frequency signal received by the second CATV coaxial communication port is separated into a CATV channel signal (output through a CATV signal output end) and a received TDD modulation signal through the branching unit, the received TDD modulation signal is input to the amplification detection circuit to be amplified and then subjected to power detection, and a low-frequency TDD signal is output, at this time, the amplification detection circuit can comprise an amplifier and a detector, wherein the input end of the amplifier is used as the input end of the amplification detection circuit, the output end of the amplifier is connected with the input end of the detector, the output end of the detector is used as the output end of the amplification detection circuit, and the purpose of amplifying the received TDD modulation signal is to enable the signal power input to the detector to be higher than the detection sensitivity of the detector, wherein the amplifier can adopt an amplifier of the beijing midrange electrical industry model number ZD3027, and the detector can adopt a detector of the Maxim model number MAX 4003; then, the low-frequency TDD signal is input into a comparator, the comparator compares the low-frequency TDD signal with a reference voltage output from the equipment body, when the input signal voltage is higher than the reference voltage, a high-level signal is generated, otherwise, a low-level signal is generated, so that the signal output by the comparator is a standard control level and is output to the slave equipment body for use, and therefore, an NR time division switch in the slave equipment body is controlled to complete TDD signal synchronization, and the comparator can adopt a comparator of SGMICRO, the model of which is SGM 8743.
The splitting unit corresponds to a combining unit in the CATV coaxial network-based TDD signal synchronization master device, so that the splitting unit can also adopt a duplexer.
The system block diagram of the TDD signal synchronization system based on the CATV coaxial network according to the present invention is shown in fig. 4, and the TDD signal synchronization system includes the TDD signal synchronization master device based on the CATV coaxial network, at least one TDD signal synchronization slave device based on the CATV coaxial network, and the CATV coaxial network, wherein a first CATV coaxial communication port of the TDD signal synchronization master device based on the CATV coaxial network is connected to a second CATV coaxial communication port of the TDD signal synchronization slave device based on the CATV coaxial network through the CATV coaxial network.
When in use, after the corresponding processing software is added, the processing process is as follows: the main control unit of the CATV coaxial network-based TDD signal synchronization master device analyzes a TDD signal from a data packet, outputs the TDD signal to the TDD modulation unit, converts the TDD modulation signal into the TDD modulation signal so as to transmit the CATV coaxial network, inputs the converted TDD modulation signal into the combining unit, synthesizes the TDD signal with a CATV channel signal input by the CATV signal input end by the combining unit to obtain a multi-frequency signal and outputs the multi-frequency signal to the first CATV coaxial communication port, the first CATV coaxial communication port transmits the multi-frequency signal to the second CATV signal synchronization slave device based on the CATV coaxial network through the CATV coaxial network, and the CATV signal synchronization slave device based on the CATV coaxial network separates the CATV channel signal (output through the CATV signal output end) from the multi-frequency signal received by the second coaxial communication port through the splitting unit and receives the TDD modulation signal, and then the received TDD modulation signal is input to an amplification detection circuit for power detection after amplification, a low-frequency TDD signal is output, then the low-frequency TDD signal is input to a comparator, the comparator compares the low-frequency TDD signal with a reference voltage output from the equipment body, when the input signal voltage is higher than the reference voltage, a high level signal is generated, otherwise, a low level signal is generated, so that the signal output by the comparator is a standard control level and is output to the slave equipment body for use, and therefore an NR time division switch in the slave equipment body is controlled to complete TDD signal synchronization.
As can be seen from the above technical disclosure, the corresponding processing software and method adopted by the present invention can be reasonably derived by those skilled in the art according to the specific structure of the CATV coaxial network-based TDD signal synchronization master-slave device and system of the present invention, and belong to the prior art, which is not the protection scope of the present invention.
Claims (10)
1. The TDD signal synchronization master device based on the CATV coaxial network comprises a master control unit, a CATV signal input end and a first CATV coaxial communication port, and is characterized by further comprising a TDD modulation unit and a combining unit, wherein the master control unit is connected with one shunt end of the combining unit through the TDD modulation unit, the other shunt end of the combining unit is connected with the CATV signal input end, and the combining end of the combining unit is connected with the first CATV coaxial communication port.
2. The CATV coaxial network-based TDD signal synchronization master device of claim 1, wherein said combining unit employs a duplexer.
3. The CATV-based TDD signal synchronization master device according to claim 1, wherein the TDD modulation unit employs a RF switch, the main control unit includes a TDD signal output terminal and a clock signal output terminal, a control terminal of the RF switch is connected to the TDD signal output terminal of the main control unit, an input terminal of the RF switch is connected to the clock signal output terminal of the main control unit, and an output terminal of the RF switch is connected to one of the splitting terminals of the combining unit.
4. The CATV-based TDD signal synchronization master device according to claim 3, wherein said master control unit includes at least a microprocessor and a clock unit, said microprocessor having a TDD signal output terminal, and said clock unit having a clock signal output terminal.
5. The CATV-based TDD signal synchronization master device according to claim 4, wherein said RF switch is an ARW3234 RF switch; the clock unit adopts a clock chip.
6. The TDD signal synchronization slave device based on the CATV coaxial network comprises a slave device body, a CATV signal output end and a second CATV coaxial communication port, and is characterized by further comprising a comparator, an amplification detection circuit and a shunt unit, wherein the slave device body at least comprises a reference voltage output end and a control level input end, the second CATV coaxial communication port is connected with a combining end of the shunt unit, one shunt end of the shunt unit is connected with the CATV signal output end, the other shunt end of the shunt unit is connected with one input end of the comparator through the amplification detection circuit, the other input end of the comparator is connected with the reference voltage output end of the slave device body, and the output end of the comparator is connected with the control level input end of the slave device body.
7. A CATV-based coaxial network clock synchronized slave device according to claim 6, wherein said branching unit employs a diplexer.
8. The CATV-based clock-synchronized slave device of claim 6, wherein the amplifying and detecting circuit comprises an amplifier and a detector, an input of the amplifier being an input of the amplifying and detecting circuit, an output of the amplifier being connected to an input of the detector, and an output of the detector being an output of the amplifying and detecting circuit.
9. The CATV-based clock-synchronized slave device of claim 8, wherein the amplifier is ZD3027, a model number of the Beijing electrical company; the detector adopts a Maxim detector with the model number of MAX 4003; the comparator is an SGMICRO comparator with model number SGM 8743.
10. The CATV coaxial network-based TDD signal synchronization system, comprising the CATV coaxial network-based TDD signal synchronization master device of any one of claims 1 to 5, and at least one CATV coaxial network-based TDD signal synchronization slave device of any one of claims 6 to 9, and a CATV coaxial network, wherein the first CATV coaxial communication port of the CATV coaxial network-based clock synchronization master device is connected to the second CATV coaxial communication port of the CATV coaxial network-based clock synchronization slave device through the CATV coaxial network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121974551.XU CN215897878U (en) | 2021-08-20 | 2021-08-20 | CATV coaxial network-based TDD signal synchronization master-slave device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121974551.XU CN215897878U (en) | 2021-08-20 | 2021-08-20 | CATV coaxial network-based TDD signal synchronization master-slave device and system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215897878U true CN215897878U (en) | 2022-02-22 |
Family
ID=80341330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121974551.XU Active CN215897878U (en) | 2021-08-20 | 2021-08-20 | CATV coaxial network-based TDD signal synchronization master-slave device and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215897878U (en) |
-
2021
- 2021-08-20 CN CN202121974551.XU patent/CN215897878U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4063419B2 (en) | Optical transmission system | |
| US8730848B2 (en) | TDD repeater for a wireless network and method for operating said repeater | |
| CN109547105B (en) | Communication equipment for realizing MIMO transmission | |
| CN101166068A (en) | Radio over fiber system and method for controlling transmission time | |
| US10790904B2 (en) | Redundant backup near-end machine, far-end machine and system thereof for digital optical fiber repeater | |
| CN211509044U (en) | Medium-voltage line power failure indication transmission system based on medium-voltage carrier communication | |
| CN111010680B (en) | Indoor distribution system | |
| CN215897878U (en) | CATV coaxial network-based TDD signal synchronization master-slave device and system | |
| KR890001476B1 (en) | Digital radio relay system | |
| CN110661573B (en) | ROF communication remote terminal and ROF system | |
| CN105530039B (en) | Combiner, combining device and signal are combined system | |
| CN216751746U (en) | Distributed antenna system | |
| CN104301910A (en) | CATV cable-sharing multi-mode room division multiplexing method and system | |
| KR100761385B1 (en) | Apparatus for compensating cable loss and detecting fault of cable connection system | |
| CN113225132A (en) | 5G base station coupling zoom-out system | |
| CN207475564U (en) | Positive optical receiving circuit with backup | |
| CN218888529U (en) | Synchronous near-end machine, far-end machine, covering unit and system of analog optical fiber remote system TDD control signal | |
| CN215073003U (en) | Micro base station equipment | |
| CN105262541A (en) | Optical fiber remote transmission timing system of air space-based radio frequency signals | |
| WO2022110993A1 (en) | Clock signal synchronisation circuit and network communication device | |
| CN211791508U (en) | Communication system | |
| CN215300635U (en) | 5G base station coupling zoom-out system | |
| CN216391431U (en) | Networking access device and system | |
| CN210927999U (en) | Base station system based on wavelength division multiplexing | |
| CN114553271B (en) | Single-cable MIMO distribution system and single-cable MIMO signal processing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |