CN108886405B - Signal filtering method, device and system - Google Patents
Signal filtering method, device and system Download PDFInfo
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- CN108886405B CN108886405B CN201680084278.9A CN201680084278A CN108886405B CN 108886405 B CN108886405 B CN 108886405B CN 201680084278 A CN201680084278 A CN 201680084278A CN 108886405 B CN108886405 B CN 108886405B
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Abstract
A method, device and system for signal filtering are used to solve the problem of low signal-to-noise ratio of DOCSIS service signal in DCA device. The first analog-to-digital converter is used for converting the first radio frequency signal output by the optical receiver into a first digital signal; the digital domain filter is used for filtering the background noise of the unused frequency band in the first digital signal converted by the first analog-to-digital converter; and the DOCSIS data access unit is used for converting the first downlink optical signal received by the DCA equipment into a second digital signal, combining the second downlink optical signal with the first digital signal which is output by the digital domain filter and is used for filtering out the bottom noise of the unused frequency band, and converting the obtained third digital signal into a second radio frequency signal for output. The digital domain filter is adopted to filter the background noise on the unused frequency band in the optical receiver service signal, and the filtered optical receiver service signal is combined with the DOCSIS service signal, so that the signal-to-noise ratio of the DOCSIS service signal is improved.
Description
Technical Field
The present invention relates to the field of communications network technologies, and in particular, to a method, a device, and a system for signal filtering.
Background
The cable television network is an important national information infrastructure, and the cable television network construction is accelerated, so that the cable television network has important significance for promoting the development of information industry, cultural industry and social career, improving the informatization level of national economy and society, meeting the increasingly diverse production and living service requirements of people, and forming a new economic growth point by pulling domestic consumption.
The Data Over Cable System Interface Specification (DOCSIS) is mainly applied between computer networks and Cable television networks, and between Cable television front ends and users to realize the transmission of Data packets. DOCSIS has been widely used as the main two-way broadband access technology for north america, european cable operators and china radio and television. Due to the requirements of video services and data services such as 4K, high definition, and interaction, and the requirements of cable network operation and maintenance management, energy conservation, emission reduction, and the like, DOCSIS technology is required to be capable of providing higher access rate and supporting more users. In the prior art, a distributed system is proposed for data transmission based on DOCSIS.
In the prior art, a Distributed CCAP Architecture (DCA) device is built based on a Converged Cable Access Platform (CCAP), and in the DCA device, a filter on an optical receiver link cannot completely eliminate interference of bottom noise on an unused frequency band in a signal transmitted on the optical receiver link on a DOCSIS link, which results in low signal-to-noise ratio of a DOCSIS service signal and poor signal quality output by the DCA device.
Disclosure of Invention
The embodiment of the invention provides a method, equipment and a system for signal filtering, which are used for solving the problems of low signal-to-noise ratio of a DOCSIS service signal in the conventional DCA equipment and poor quality of a signal output by the DCA equipment.
In a first aspect, an embodiment of the present invention provides a distributed CCAP architecture device, including: the system comprises a first analog-to-digital converter, a digital domain filter and a Data Over Cable Service Interface Specification (DOCSIS) data access unit; the first analog-to-digital converter is connected with the optical receiver and used for converting the first radio-frequency signal output by the optical receiver into a first digital signal; the digital domain filter is connected with the first analog-to-digital converter and is used for filtering the background noise on the unused frequency band in the first digital signal converted by the first analog-to-digital converter; the DOCSIS data access unit is connected with the digital domain filter, and is configured to convert a first downlink optical signal received by a distributed CCAP architecture DCA device into a second digital signal, combine the second downlink optical signal with the first digital signal output by the digital domain filter, where the bottom noise is filtered, to obtain a third digital signal, and convert the third digital signal into a second radio frequency signal for output; and the optical fiber module is also used for converting a third radio frequency signal received by the DCA equipment into an uplink optical signal and outputting the uplink optical signal.
In the embodiment of the invention, the bottom noise on a frequency band which is not used in the first digital signal is filtered by the digital domain filter, and the first digital signal after the bottom noise is filtered is combined with the second digital signal, so that the influence on the second digital signal is reduced, and the quality of the DOCSIS service signal output by the DCA equipment is improved.
With reference to the first aspect, in a first possible implementation manner, the DOCSIS data access unit includes: optical network unit ONU, DOCSIS digital domain processing module, digital domain closes way module and digital analog converter, wherein: the ONU is used for receiving the first downlink optical signal received by the DCA equipment; the DOCSIS digital domain processing module is connected to the ONU, and configured to convert the first downlink optical signal received by the ONU into the second digital signal; the digital domain combining module is connected with the DOCSIS digital domain processing module and the digital domain filter, and is configured to combine the first digital signal with noise-reduced by the digital domain filter with the second digital signal output by the DOCSIS digital domain processing module to obtain the third digital signal; the digital-to-analog converter is connected to the digital domain combining module, and is configured to convert the third digital signal output by the digital domain combining module into the second radio frequency signal for output.
With reference to the first aspect and the first possible implementation manner of the first aspect, in a second possible implementation manner, the apparatus further includes a second analog-to-digital converter, configured to receive a third radio frequency signal received by the DCA device, and convert the third radio frequency signal into a fourth digital signal; the DOCSIS digital domain processing module is further connected to the second analog-to-digital converter, and is configured to convert a fourth digital signal output by the second analog-to-digital converter into an uplink optical signal, and output the uplink optical signal through the ONU.
With reference to the first aspect, in a third possible implementation manner, the DOCSIS data access unit further includes a duplexer, connected to the DOCSIS data access unit, and configured to output the second radio frequency signal from the DCA device, receive a third radio frequency signal received by the DCA device, and send the third radio frequency signal to the DOCSIS data access unit.
In the embodiment of the invention, the duplexer is a high-pass filter and a low-pass filter, and different frequency bands are respectively used during uplink processing and downlink processing.
With reference to the first aspect and the third possible implementation manner of the first aspect, in a fourth possible implementation manner, the DOCSIS data access unit further includes a first matching circuit, respectively connected to the DOCSIS data access unit and the duplexer, and configured to ensure transmission characteristics of the second radio frequency signal output by the DOCSIS data access unit.
In the embodiment of the present invention, the first matching circuit is used to ensure the flatness of the second video signal, and the matching circuit needs to consume more power, so that the number of matching circuits is reduced during the design of DCA equipment, and the power consumption can be reduced.
With reference to the first aspect and the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, the apparatus further includes a first amplifying circuit, connected to the first matching circuit and the duplexer, respectively, and configured to amplify the second radio frequency signal after transmission characteristic processing is guaranteed by the first matching circuit.
In the embodiment of the invention, the first amplifying circuit is used for amplifying the second radio-frequency signal, so that the amplified second radio-frequency signal can ensure a longer transmission distance.
With reference to the first aspect and the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the radio frequency transmitter further includes a second matching circuit, connected to the first amplifying circuit and the duplexer, respectively, and configured to ensure transmission characteristics of the second radio frequency signal amplified by the first amplifying circuit.
With reference to the first aspect and the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the rf transceiver includes a second amplifying circuit, which is respectively connected to the second matching circuit and the duplexer and configured to amplify the second rf signal passing through the second matching circuit.
With reference to the first aspect and the third possible implementation manner of the first aspect, in an eighth possible implementation manner, the apparatus further includes a third amplifying circuit, connected to the duplexer, where the duplexer is specifically configured to receive a third radio frequency signal received by the DCA device and send the third radio frequency signal to the third amplifying circuit; and the third amplifying circuit is connected with the DOCSIS data access unit and is used for amplifying the third radio frequency signal and outputting the amplified third radio frequency signal to the DOCSIS data access unit.
In the embodiment of the invention, the third radio frequency signal is amplified by using the third amplifying circuit, so that the amplified third radio frequency signal can ensure a longer transmission distance.
In a second aspect, an embodiment of the present invention provides a distributed system, which includes a video service processing module, a data service processing module, an optical transmitter, a first wavelength division multiplexing WDM module, a second WDM module, and the DCA device, an amplifier group, and a terminal device described in any possible implementation manner of the first aspect, where:
the data service processing module is used for receiving service data of an upper network and converting the service data of the upper network into a first downlink optical signal;
the video service processing module is used for receiving video data of an upper network and converting the video data of the upper network into a first radio frequency signal;
the optical transmitter is connected with the video service processing module and is used for converting the first radio-frequency signal converted from the video data of the upper network into a second downlink optical signal;
the first WDM module is connected to the optical transmitter and the data service processing module, and configured to combine the first downlink optical signal output by the data service processing module with the second downlink optical signal output by the optical transmitter;
the second WDM module is connected to the first WDM module and configured to separate the first downlink optical signal and the second downlink optical signal combined by the first WDM module;
the DCA device is connected to the second WDM module, and is configured to convert the first downlink optical signal and the second downlink optical signal output by the second WDM module into a second radio frequency signal;
the amplifier group is connected with the DCA equipment, and is used for amplifying the second radio frequency signal output by the DCA equipment and outputting the second radio frequency signal to terminal equipment;
the terminal device is connected with the amplifier group, and is used for receiving the second radio frequency signal output by the amplifier group and sending a third radio frequency signal;
the DCA device is further configured to convert the third radio frequency signal sent by the terminal device and received by the amplifier group into an uplink optical signal, and output the uplink optical signal to the data service processing module through the first WDM module and the second WDM module;
and the data service processing module is also used for converting the uplink optical signal into service data transmitted to an upper network.
In the embodiment of the present invention, the terminal device may be a television connected to a set-top box, or may be a computer connected to a modem.
With reference to the second aspect, in a first possible implementation manner, the amplifier group includes at least one amplifier.
In an embodiment of the present invention, the amplifier group is configured to ensure a transmission distance between the second radio frequency signal and a third radio frequency signal.
In a third aspect, an embodiment of the present invention provides a method for filtering a signal, where the method includes:
firstly, converting a determined first radio frequency signal into a first digital signal, then filtering background noises on unused frequency bands in the first digital signal, and finally combining the filtered first digital signal with a second digital signal to output a third digital signal.
In the embodiment of the invention, the background noise on a frequency band is not used in the first digital signal for filtering, and the first digital signal after the background noise is filtered is combined with the second digital signal, so that the influence on the second digital signal is reduced, and the quality of a DOCSIS service signal output by DCA equipment is improved.
With reference to the third aspect, in a first possible implementation manner, a first downlink optical signal is received, the received first downlink optical signal is converted into the second digital signal, then the first digital signal with the background noise filtered is combined with the second digital signal to obtain a third digital signal, and after the third digital signal is obtained, the third digital signal is converted into the second radio frequency signal to be output.
With reference to the third aspect and the first possible implementation manner of the third aspect, in a second possible implementation manner, a third radio frequency signal is received, then the third radio frequency signal is converted into a fourth digital signal, and finally the fourth digital signal is converted into an uplink optical signal and the uplink optical signal is output.
Drawings
Fig. 1 is a schematic structural diagram of a distributed system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a distributed CCAP architecture device according to an embodiment of the present invention;
fig. 3 is a schematic signal diagram illustrating a combined DOCSIS service signal and an optical receiver service signal in the prior art according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a prior art filter according to an embodiment of the present invention;
FIG. 5 is a diagram of a digital domain filter according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a second RF signal according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a method for filtering a signal according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto. It is to be understood that the embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
When a television user or a computer user has a demand for a video service and a data service, in order to support more users, video data of the video service and service data of the data service need to be processed through a distributed system, in a distributed system as shown in fig. 1, video data of an upper layer network is converted into a first radio frequency signal through a video service processing module 20, and sent to an optical transmitter 40, and the optical transmitter 40 converts the received first radio frequency signal into a second downlink optical signal; the data service processing module 30 receives service data of an upper network and converts the service data of the upper network into a first downlink optical signal; after the first downlink optical signal and the second downlink optical signal are combined by the first WDM module 50, the first downlink optical signal and the second downlink optical signal combined by the first WDM module 50 are separated by the second WDM module 60; the first downlink optical signal and the second downlink optical signal are converted into radio frequency signals through the DCA device 10, and the radio frequency signals are amplified through the amplifier group 70 and output to the terminal device 80. An optical receiver in DCA equipment in the prior art converts a received second downlink optical signal into an optical receiver service signal, a filter is adopted in the DCA equipment to filter an optical receiver service signal output by the optical receiver, and the filtered signal is combined with a DOCSIS service signal output by a DOCSIS data access unit in the DCA equipment, because the optical receiver service signal converted by the second downlink optical signal through the optical receiver is a radio frequency signal, and because the filter cannot filter a frequency band below a certain frequency (such as f6) in the radio frequency signal, the problem of poor signal-to-noise ratio of the DOCSIS service signal is caused when the optical receiver service signal is combined with the DOCSIS service signal; in addition, the matching circuit and the combining circuit in the DCA device in the prior art have large signal consumption, a multi-stage amplifier needs to be arranged in the distributed system in the prior art, and the arranged multi-stage amplifier has large power consumption. Therefore, in order to improve the signal-to-noise ratio of the DOCSIS service signal and increase the bandwidth, a new DCA device is proposed in the embodiment of the present invention as follows.
An embodiment of the present invention provides a DCA device, as shown in fig. 2, the DCA device includes: a first analog-to-digital converter 100, a digital domain filter 101 and a data over cable service interface specification DOCSIS data access unit 102; wherein the content of the first and second substances,
the first analog-to-digital converter 100 is connected to the optical receiver 103, and is configured to convert the first radio frequency signal output by the optical receiver 103 into a first digital signal;
the digital domain filter 101 is connected to the first analog-to-digital converter 100, and is configured to filter bottom noise of an unused frequency band in the first digital signal converted by the first analog-to-digital converter 100;
the DOCSIS data access unit 102, connected to the digital domain filter 101, is configured to convert the first downlink optical signal received by the DCA device 10 into a second digital signal, and then combine the second downlink optical signal with the first digital signal, which is output by the digital domain filter 101 and has noise floor filtered, to obtain a third digital signal, and convert the third digital signal into a second radio frequency signal and output the second radio frequency signal; and is also used for converting the third rf signal received by the DCA device 10 into an uplink optical signal for output.
Fig. 3 shows a combined signal of a DOCSIS service signal generated by converting a first downlink optical signal in the prior art and an optical receiver service signal generated by converting a second downlink optical signal filtered by a filter in the prior art. As shown in fig. 4, in the filter in the prior art, since the optical receiver service signal converted from the second downlink optical signal by the optical receiver is a radio frequency signal, and the filter cannot filter a frequency band below the f6 frequency band in the radio frequency signal, when the DOCSIS service signal is combined with the optical receiver service signal, the signal-to-noise ratio of the DOCSIS service signal is low, and the signal quality is poor.
A digital domain filter 101 proposed in the embodiment of the present invention is shown in fig. 5, where the digital domain filter 101 receives a first digital signal converted by a first analog-to-digital converter, and the digital domain filter 101 may filter a frequency band below a frequency band f6 in the digital signal, that is, may filter the first digital signal, where the first digital signal is obtained by converting a first radio frequency signal, where the first radio frequency signal is an optical receiver service signal in the prior art; the first digital signal after filtering and the second digital signal converted from the DOCSIS service signal are combined to obtain a third digital signal, and the third digital signal is converted into a second video signal, where the second radio frequency signal is as shown in fig. 6, because the digital domain filter 101 filters the background noise of the unused frequency band in the optical receiver service signal, the influence on the DOCSIS service signal is reduced, the signal-to-noise ratio of the DOCSIS service signal is improved, and the quality of the output signal of the DCA device is improved.
Optionally, the DOCSIS data access unit includes: optical network unit ONU1021, DOCSIS digital domain processing module 1022, digital domain combiner module 1023 and digital-to-analog converter 1024, wherein:
the ONU1021, configured to receive the first downlink optical signal received by the DCA device 10;
the DOCSIS digital domain processing module 1022 is connected to the ONU1021, and configured to convert the first downlink optical signal received by the ONU1021 into the second digital signal;
the digital domain combining module 1023 is connected to the DOCSIS digital domain processing module 1022 and the digital domain filter 101, and is configured to combine the first digital signal with noise-reduced by the digital domain filter 101 with the second digital signal output by the DOCSIS digital domain processing module 1022, so as to obtain the third digital signal;
the digital-to-analog converter 1024 is connected to the digital domain combiner module 1023, and is configured to convert the third digital signal output by the digital domain combiner module 1023 into the second radio frequency signal for output.
In the embodiment of the present invention, the digital domain combining module 1023 is used to combine the first digital signal and the second digital signal, so that a combining circuit and a plurality of matching circuits in the DCA device in the prior art do not need to be designed, which reduces the signal loss and improves the signal transmission performance. Meanwhile, because the loss of the signal output by the DCA equipment is small, a multi-stage amplifier is not required to be designed when a distributed system is designed, and the power consumption of the system is reduced.
Optionally, the DOCSIS data access unit 102 further includes a second analog-to-digital converter 1025, configured to receive a third radio frequency signal received by the DCA device 10, and convert the third radio frequency signal into a fourth digital signal;
the DOCSIS digital domain processing module 1022 is further connected to the second analog-to-digital converter 1025, and configured to convert the fourth digital signal output by the second analog-to-digital converter 1025 into an uplink optical signal, and output the uplink optical signal through the ONU 1021.
In the embodiment of the present invention, the third rf signal is converted into a fourth digital signal through the second analog-to-digital converter 1025, and the fourth digital signal is converted into an uplink optical signal through the digital domain processing module 1022, thereby completing transmission of uplink data.
Optionally, the DCA device 10 further includes a duplexer 109 connected to the DOCSIS data access unit 102, and configured to output the second radio frequency signal from the DCA device 10, receive the third radio frequency signal received by the DCA device 10, and send the third radio frequency signal to the DOCSIS data access unit 102.
In the embodiment of the present invention, the duplexer 109 outputs the second radio frequency signal and inputs the third radio frequency signal, thereby ensuring the integrity of signal transmission in the DCA device.
Optionally, the DCA device 10 further includes a first matching circuit 104, which is respectively connected to the DOCSIS data access unit 102 and the duplexer 109.
In this embodiment of the present invention, the first matching circuit 104 ensures the transmission characteristics of the second rf signal output by the DOCSIS data access unit 102.
Optionally, the DCA device 10 further includes a first amplifying circuit 105, connected to the first matching circuit 104 and the duplexer 109, respectively, for amplifying the second radio frequency signal after the transmission characteristic processing is ensured by the first matching circuit 104.
In the embodiment of the present invention, the first amplifying circuit 105 ensures the transmission distance of the second rf signal.
Optionally, the DCA device 10 further includes a second matching circuit 106, which is respectively connected to the first amplifying circuit 105 and the duplexer 109.
In the embodiment of the present invention, the second matching circuit 106 ensures the transmission characteristic of the second rf signal amplified by the first amplifying circuit 105.
Optionally, the DCA device 10 further includes a second amplifying circuit 107, respectively connected to the second matching circuit 106 and the duplexer 109, and configured to amplify the second radio frequency signal passing through the second matching circuit 106.
In the embodiment of the present invention, the first amplifying circuit 107 ensures the transmission distance of the second rf signal.
In this embodiment of the present invention, other matching circuits and other amplifiers may be connected between the duplexer 109 and the DOCSIS data access unit 102, which is not limited in this embodiment of the present invention.
Optionally, still include third amplifier circuit 108 in DCA equipment 10, connect duplexer 109, duplexer 109 specifically is used for receiving third radio frequency signal that DCA equipment 10 received, and will third radio frequency signal sends third amplifier circuit 108, third amplifier circuit 108 connects DOCSIS data access unit 102 is used for right output after third radio frequency signal amplifies to DOCSIS data access unit 102.
In the embodiment of the present invention, the third amplifying circuit 108 ensures the transmission distance of the third rf signal.
Based on the same inventive concept, an embodiment of the present invention provides a signal filtering method, including:
And 72, filtering the first digital signal by a digital domain filter in the DCA device, and filtering background noise on an unused frequency band in the first digital signal.
And 73, the DOCSIS data access unit in the DCA device combines the filtered first digital signal and the filtered second digital signal, and outputs a third digital signal.
In the embodiment of the invention, the DCA device filters the background noise on the unused frequency band in the first digital signal, and combines the first digital signal after the background noise is filtered with the second digital signal, so that the influence on the second digital signal is reduced, and the quality of the DOCSIS service signal output by the DCA device is improved.
Optionally, the ONU in the DCA device receives a first downlink optical signal, the DOCSIS digital domain processing module in the DCA device converts the received first downlink optical signal into the second digital signal, then the digital domain combining module in the DCA device combines the first digital signal with the second digital signal, where the background noise is filtered, to obtain the third digital signal, and after the third digital signal is obtained, the digital-to-analog converter in the DCA device converts the third digital signal into the second radio frequency signal for output.
Optionally, a second analog-to-digital converter in the DCA device receives a third radio frequency signal, then a DOCSIS digital domain processing module in the DCA device converts the third radio frequency signal into a fourth digital signal, and finally converts the fourth digital signal into an uplink optical signal and outputs the uplink optical signal.
In the embodiment of the present invention, there are other signal filtering methods, which may refer to the content included in the above-mentioned DCA device, and the details of the method are not described again in the present invention.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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 invention 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 preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A distributed CCAP architecture device, comprising: the system comprises a first analog-to-digital converter, a digital domain filter and a Data Over Cable Service Interface Specification (DOCSIS) data access unit; wherein the content of the first and second substances,
the first analog-to-digital converter is connected with the optical receiver and used for converting the first radio-frequency signal output by the optical receiver into a first digital signal;
the digital domain filter is connected with the first analog-to-digital converter and is used for filtering the background noise on the unused frequency band in the first digital signal converted by the first analog-to-digital converter;
the DOCSIS data access unit is connected with the digital domain filter, and is configured to convert a first downlink optical signal received by a distributed CCAP architecture DCA device into a second digital signal, combine the second downlink optical signal with the first digital signal output by the digital domain filter, where the bottom noise is filtered, to obtain a third digital signal, and convert the third digital signal into a second radio frequency signal for output; and the optical fiber module is also used for converting a third radio frequency signal received by the DCA equipment into an uplink optical signal and outputting the uplink optical signal.
2. The device of claim 1, wherein the DOCSIS data access unit comprises an Optical Network Unit (ONU), a DOCSIS digital domain processing module, a digital domain combining module, and a digital-to-analog converter, wherein:
the ONU is used for receiving the first downlink optical signal received by the DCA equipment;
the DOCSIS digital domain processing module is connected to the ONU, and configured to convert the first downlink optical signal received by the ONU into the second digital signal;
the digital domain combining module is connected with the DOCSIS digital domain processing module and the digital domain filter, and is configured to combine the first digital signal with noise-reduced by the digital domain filter with the second digital signal output by the DOCSIS digital domain processing module to obtain the third digital signal;
the digital-to-analog converter is connected to the digital domain combining module, and is configured to convert the third digital signal output by the digital domain combining module into the second radio frequency signal for output.
3. The apparatus of claim 2, further comprising a second analog-to-digital converter for receiving a third radio frequency signal received by the DCA apparatus and converting the third radio frequency signal into a fourth digital signal;
the DOCSIS digital domain processing module is further connected to the second analog-to-digital converter, and is configured to convert a fourth digital signal output by the second analog-to-digital converter into an uplink optical signal, and output the uplink optical signal through the ONU.
4. The device of claim 1, further comprising a duplexer coupled to said DOCSIS data access unit for outputting said second radio frequency signal from said DCA device and receiving a third radio frequency signal received by said DCA device and transmitting to said DOCSIS data access unit.
5. The apparatus of claim 4, further comprising a first matching circuit coupled to said DOCSIS data access unit and said diplexer, respectively, for ensuring transmission characteristics of said second rf signals output by said DOCSIS data access unit.
6. The apparatus of claim 5, further comprising first amplification circuits, each respective one of which is configured to amplify a respective one of the signals
And the duplexer is connected with the first matching circuit and used for amplifying the second radio-frequency signal which is processed by the first matching circuit and ensures the transmission characteristic.
7. The device according to claim 4, further comprising a third amplifying circuit connected to the duplexer, wherein the duplexer is specifically configured to receive a third rf signal received by the DCA device and send the third rf signal to the third amplifying circuit;
and the third amplifying circuit is connected with the DOCSIS data access unit and is used for amplifying the third radio frequency signal and outputting the amplified third radio frequency signal to the DOCSIS data access unit.
8. A distributed system comprising the DCA device of any of claims 1-7.
9. A method of signal filtering, the method comprising:
converting the determined first radio frequency signal into a first digital signal;
filtering the first digital signal, and filtering out background noise on unused frequency bands in the first digital signal;
combining the filtered first digital signal with the filtered second digital signal, and outputting a third digital signal;
converting the first downlink optical signal received by the distributed CCAP architecture DCA equipment into the second digital signal;
combining the first digital signal and the second digital signal with the background noise filtered off to obtain a third digital signal;
converting the third digital signal into a second radio frequency signal and outputting the second radio frequency signal;
and converting the third radio frequency signal received by the DCA equipment into an uplink optical signal and outputting the uplink optical signal.
10. The method of claim 9, wherein converting the third rf signal received by the DCA device into an uplink optical signal output comprises:
converting the third radio frequency signal into a fourth digital signal;
and converting the fourth digital signal into an uplink optical signal and outputting the uplink optical signal.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/096283 WO2018035693A1 (en) | 2016-08-22 | 2016-08-22 | Signal filtering method, device and system |
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| CN108886405A CN108886405A (en) | 2018-11-23 |
| CN108886405B true CN108886405B (en) | 2020-04-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101094032A (en) * | 2007-05-31 | 2007-12-26 | 中国移动通信集团广东有限公司 | Radio signal coverage system |
| CN101369818A (en) * | 2008-08-01 | 2009-02-18 | 京信通信系统（中国）有限公司 | Multi-frequency band duplex/simplex switching combiner/divider unit and its method |
| CN201282568Y (en) * | 2008-07-08 | 2009-07-29 | 西瑞克斯(北京)通信设备有限公司 | Multi-channel digital frequency shift and frequency selection distributed system of GSM network |
| CN102006683A (en) * | 2010-11-27 | 2011-04-06 | 武汉虹信通信技术有限责任公司 | Digital radio-frequency remote system applied to double-communication system |
| CN102723952A (en) * | 2012-06-27 | 2012-10-10 | 华为技术有限公司 | Analog/digital conversion data transmission method, transmitting device and analog/digital conversion chip |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101702634B (en) * | 2009-11-12 | 2012-02-08 | 无锡路通光电技术有限公司 | Device and method for realizing providing DOCSIS service by radio frequency passive optical network |
| CN102928736B (en) * | 2012-10-29 | 2018-07-24 | 罗森伯格（上海）通信技术有限公司 | A kind of signal processing method, unit, device and signal transmission system |
| CN103997354B (en) * | 2013-02-16 | 2016-12-28 | 中兴通讯股份有限公司 | A kind of mixing system, mixer device and frequency mixing method |
| JP2016519862A (en) * | 2013-03-02 | 2016-07-07 | ウェステル テクノロジーズ インコーポレイテッド | Distributed antenna system with high near field performance |
| US10050801B2 (en) * | 2014-01-31 | 2018-08-14 | Comcast Cable Communications, Llc | Digital forward link in hybrid fiber-coax network |
-
2016
- 2016-08-22 CN CN201680084278.9A patent/CN108886405B/en active Active
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101094032A (en) * | 2007-05-31 | 2007-12-26 | 中国移动通信集团广东有限公司 | Radio signal coverage system |
| CN201282568Y (en) * | 2008-07-08 | 2009-07-29 | 西瑞克斯(北京)通信设备有限公司 | Multi-channel digital frequency shift and frequency selection distributed system of GSM network |
| CN101369818A (en) * | 2008-08-01 | 2009-02-18 | 京信通信系统（中国）有限公司 | Multi-frequency band duplex/simplex switching combiner/divider unit and its method |
| CN102006683A (en) * | 2010-11-27 | 2011-04-06 | 武汉虹信通信技术有限责任公司 | Digital radio-frequency remote system applied to double-communication system |
| CN102723952A (en) * | 2012-06-27 | 2012-10-10 | 华为技术有限公司 | Analog/digital conversion data transmission method, transmitting device and analog/digital conversion chip |
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| CN108886405A (en) | 2018-11-23 |
| WO2018035693A1 (en) | 2018-03-01 |
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