CN102547775B - System and method for simultaneous indoor covering of multiple types of communication signals by utilizing CATV (community antenna television) cable - Google Patents
System and method for simultaneous indoor covering of multiple types of communication signals by utilizing CATV (community antenna television) cable Download PDFInfo
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Abstract
The invention relates to a system for simultaneous indoor covering of multiple types of communication signals by utilizing a CATV (community antenna television) cable, wherein the system comprises an outdoor path combination unit and a home-entry covering unit, wherein the outdoor path combination unit is used for carrying out path combination on communication signals dropping in the frequency range of a CATV signal after frequency conversion processing, the communication signals which do not drop in the frequency range of the CATV cable and a CATV television signal, and finally transmitting in home in a common-cable mode through the CATV cable; and the home-entry covering unit is used for branching the path combination signals sent by the outdoor path combination unit, wherein the CATV signals are transmitted to the television through the CATV cable, and the rest communication signals are output to an antenna after being processed. The system provided by the invention has certain creativity, practicability and perspectiveness.
Description
Technical field
The present invention relates to wireless communication signals Covering domain, particularly relate to a kind of CATV of use cable and carry out the indoor system and method simultaneously covered of multiple signal of communication.
Background technology
Along with the increase at full speed of mobile subscriber, the demand of indoor call and data service improves constantly, and mobile communication indoor covering and WLAN hot spot construction just become the popular business that each operator pays close attention to.For cell portion, laying special-purpose radio-frequency of registering one's residence cable carries out the difficulty that in-door covering also exists coordination aspect and construction aspect, therefore, System and method for of the present invention is by existing CATV TV cable, coupling communication signals is wherein carried out covering of registering one's residence, and is a very practical method.See from the perspective of policy, country accelerates to advance " integration of three networks " (telecommunications network, computer network, cable television network) process, the fusion of Multi net voting has also become following information industry development direction, and System and method for of the present invention is exactly the creative product meeting this trend, direction.
Commonly at present carry out signal of communication by CATV cable and to register one's residence the product and method that cover, substantially be all that individual communication signal and CATV signal are carried out co-cable transmission behind conjunction road, especially cannot realize having overlapping signal to carry out conjunction road co-cable transmission with CATV signal at interior multiple types signal of communication containing with CATV signal frequency range simultaneously.
Summary of the invention
A kind of CATV of use cable is the object of the present invention is to provide to carry out the indoor system and method simultaneously covered of multiple signal of communication, can realize comprising has the multiple signal of communication of the signal overlapped to close road with CATV signal with the CATV signal frequency range of 5-860MHz simultaneously, then carries out registering one's residence quorum sensing inhibitor by a CATV cable co-cable transmission.
The technical solution used in the present invention is: a kind of CATV of use cable carries out the system that multiple signal of communication indoor cover simultaneously, it is characterized in that: comprise outdoor combiner unit and register one's residence capping unit; Wherein,
Outdoor combiner unit, for the signal of communication that will drop in the frequency range of CATV signal, after frequency-conversion processing, with the signal of communication do not dropped in CATV signal frequency range and CATV television signal combining, carry out co-cable transmission finally by CATV cable and register one's residence; Or, for from registering one's residence capping unit transmission Lai He road signal after treatment, carrying out shunt and forwarding;
Register one's residence capping unit, for the conjunction road signal transmitted from outdoor combiner unit along separate routes, wherein CATV signal is by CATV cable transmission to TV, and all the other signals of communication export to antenna after treatment; Or for the multiple signal of communication received from antenna end is processed, and then carry out conjunction road with the CATV signal transmitted from CATV cable, last conjunction road signal carries out common cable passback by CATV cable again.
A kind of CATV of use cable carries out the method that multiple signal of communication indoor cover simultaneously, it is characterized in that: frequency range is had overlapping signal of communication with the frequency range of CATV signal, be converted to in the conflict free frequency of the frequency range of other signal transmissions, again itself and CATV signal are closed road with other signals of communication, carry out registering one's residence while co-cable transmission realizes multiple signal of communication quorum sensing inhibitor by CATV cable afterwards.
Described use CATV cable carries out the indoor method simultaneously covered of multiple signal of communication and comprises down direction and up direction;
Described down direction the method comprises:
Signal of communication in the frequency range of CATV signal will be dropped on, by the idle frequency range of active frequency-variable module raising frequency tremendously high frequency; Signal of communication after raising frequency and the mobile communication signal of other standards and CATV TV signal to be carried out behind conjunction road by CATV cable transmission to capping unit of registering one's residence; The conjunction road signal received is divided into three tunnels by capping unit of registering one's residence: a road CATV signal, is watched to TV by CATV cable transmission for user; One tunnel is the signal of communication after the raising frequency being positioned at the idle frequency range of high frequency, after frequency reducing reduction, export antenna to; One tunnel comprises the mobile communication combining signal of multiple types, is exported by wide frequency antenna;
Described up direction the method comprises:
Register one's residence capping unit by idle for the signal of communication raising frequency tremendously high frequency in the frequency range dropping on CATV signal that receives frequency range, the CATV signal that the mobile communication signal of what the signal obtained after conversion and wide frequency antenna received comprise multiple types, CATV cable transmit carries out conjunction road, and the signal closed behind road is back to outdoor combiner unit by CATV cable; The signal that capping unit of registering one's residence transmits by outdoor combiner unit carries out forwarding along separate routes: by CATV cable transmission CATV signal wherein, the signal of communication frequency reducing of the raising frequency in idle for high frequency frequency range reduce and to return, by the shunt returning respectively of the signal of communication of other each standards.
Beneficial effect of the present invention is exactly, by having overlapping signal of communication to carry out the means on frequency conversion Hou Zaihe road by with 5-860MHz frequency range, with on the basis of CATV signal co-cable transmission, the Product Usability after following broadcasting and TV use full frequency band can be in turn ensure that at the current each standard signal of communication of guarantee.Therefore, the present invention has certain creativeness, practicality and perspective.
Accompanying drawing explanation
Fig. 1 is system architecture diagram of the present invention.
Fig. 2 is the down direction flow chart of method of the present invention.
Fig. 3 is the up direction flow chart of method of the present invention.
Embodiment
System involved in the present invention is that a kind of CATV of use cable carries out the indoor system simultaneously covered of multiple signal of communication, comprises outdoor combiner unit and registers one's residence capping unit; Wherein,
Outdoor combiner unit, for the signal of communication that will drop in the frequency range of CATV signal, after frequency-conversion processing, with the signal of communication do not dropped in CATV signal frequency range and CATV television signal combining, carry out co-cable transmission finally by CATV cable and register one's residence; Or, for from registering one's residence capping unit transmission Lai He road signal after treatment, carrying out shunt and forwarding;
Register one's residence capping unit, for the conjunction road signal transmitted from outdoor combiner unit along separate routes, wherein CATV signal is by CATV cable transmission to TV, and all the other signals of communication export to antenna after treatment; Or for the multiple signal of communication received from antenna end is processed, and then carry out conjunction road with the CATV signal transmitted from CATV cable, last conjunction road signal carries out common cable passback by CATV cable again.
Above-mentioned outdoor combiner unit comprises the first frequency-variable module, and first closes road module and second closes road module; Wherein,
First frequency-variable module is active bi-directional frequency-variable module, and the idle frequency range of the signal of communication raising frequency tremendously high frequency for dropping in the frequency range of CATV signal, prepares for carrying out conjunction road with the signal of communication of other standards more afterwards; Or the signal of communication being arranged in the idle frequency range of high frequency is reduced to the frequency range dropping on CATV signal;
First closes road module, for passive bidirectional closes road module, for the signal of communication that will do not drop in CATV signal frequency range, carry out conjunction road with the signal of communication after the first frequency-variable module raising frequency, the mobile communication signal closed behind road is transferred to the second conjunction road module by radio frequency coaxial-cable; Or, after closing the conjunction road Signal reception of the multimode communication signal that road module transmits from second, carry out filtering and forward along separate routes;
Second closes road module, is passive bidirectional module, for closing mobile communication combining signal that road module transmits by first and CATV TV signal carries out conjunction road, afterwards by CATV cable transmission to capping unit of registering one's residence; Or the signal transmitted from capping unit of registering one's residence is carried out shunt to forward.
Above-mentioned capping unit of registering one's residence comprises the first shunt module, the second shunt module and the second frequency-variable module; Wherein,
First shunt module, for passive bidirectional module, for receiving from outdoor combiner unit through conjunction road signal that CATV cable transmits, and be divided into two-way, wherein a road CATV signal is watched for user to TV by CATV cable transmission, and the mobile communication signal that an other road comprises multiple types is transferred to the second shunt module by radio frequency coaxial-cable; Or, after the signal transmitted from user's TV and the second shunt module is carried out conjunction road, be back to outdoor combiner unit by CATV cable;
Second shunt module, for passive bidirectional module, for receiving mobile communication combining signal that transmit from the first shunt module, that comprise multiple types, and be divided into two-way, wherein a road is by the signal of communication being positioned at the idle frequency range of high frequency after raising frequency, is then transferred to the second frequency-variable module; An other road is remaining mobile communication signal, is launched by wide frequency antenna; Or, for by the signal of communication being positioned at the idle frequency range of high frequency after raising frequency with carry out conjunction road from the mobile communication signal that wide frequency antenna receives, return to the first shunt module afterwards;
Second frequency-variable module is active bi-directional frequency-variable module, and for by by the signal of communication being positioned at the idle frequency range of high frequency after raising frequency, frequency reducing is reduced into the signal of communication of normal frequency, is then launched by antenna; Or, the signal of communication raising frequency in CATV frequency range of falling into received from antenna is returned after the idle frequency range of tremendously high frequency frequently again.
Above-mentioned outdoor combiner unit and register one's residence between capping unit, by connecing the mode of power splitter, realizes the effect of a corresponding multiple capping unit of registering one's residence of outdoor combiner unit.
Method involved in the present invention is that a kind of CATV of use cable carries out the indoor method simultaneously covered of multiple signal of communication, frequency range there is overlapping signal of communication with the frequency range of CATV signal, be converted to in the conflict free frequency of the frequency range of other signal transmissions, again itself and CATV signal are closed road with other signals of communication, carry out registering one's residence while co-cable transmission realizes multiple signal of communication quorum sensing inhibitor by CATV cable afterwards.
Above-mentioned use CATV cable carries out the indoor method simultaneously covered of multiple signal of communication and comprises down direction and up direction;
Above-mentioned down direction the method comprises:
Signal of communication in the frequency range of CATV signal will be dropped on, by the idle frequency range of active frequency-variable module raising frequency tremendously high frequency; Signal of communication after raising frequency and the mobile communication signal of other standards and CATV TV signal to be carried out behind conjunction road by CATV cable transmission to capping unit of registering one's residence; The conjunction road signal received is divided into three tunnels by capping unit of registering one's residence: a road CATV signal, is watched to TV by CATV cable transmission for user; One tunnel is the signal of communication after the raising frequency being positioned at the idle frequency range of high frequency, after frequency reducing reduction, export antenna to; One tunnel comprises the mobile communication combining signal of multiple types, is exported by wide frequency antenna;
Above-mentioned up direction the method comprises:
Register one's residence capping unit by idle for the signal of communication raising frequency tremendously high frequency in the frequency range dropping on CATV signal that receives frequency range, the CATV signal that the mobile communication signal of what the signal obtained after conversion and wide frequency antenna received comprise multiple types, CATV cable transmit carries out conjunction road, and the signal closed behind road is back to outdoor combiner unit by CATV cable; The signal that capping unit of registering one's residence transmits by outdoor combiner unit carries out forwarding along separate routes: by CATV cable transmission CATV signal wherein, the signal of communication frequency reducing of the raising frequency in idle for high frequency frequency range reduce and to return, by the shunt returning respectively of the signal of communication of other each standards.
The idle frequency range of above-mentioned high frequency is 960-1710MHz.
The frequency range of above-mentioned CATV signal is 5-860MHz.
Specific implementation process, can referring to figs. 1 to Fig. 3, in this implementation process, for cdma communication signal.
System configuration as shown in Figure 1, comprises outdoor combiner unit and registers one's residence capping unit; Wherein,
Outdoor combiner unit, for the signal of communication that will drop in the frequency range 5-860MHz of CATV signal, for CDMA signal, after frequency-conversion processing, these do not drop on signal of communication in CATV signal frequency range and CATV television signal combining with GSM, DCS, WCDMA, CDMA2000, TD-SCDMA, LTE and WLAN etc., carry out co-cable transmission register one's residence finally by CATV cable; Or, for from registering one's residence capping unit transmission Lai He road signal after treatment, carrying out shunt and forwarding;
To register one's residence capping unit, for the conjunction road signal transmitted from outdoor combiner unit along separate routes, wherein CATV signal is by CATV cable transmission to TV, and the signals of communication such as remaining CDMA, GSM, DCS, WCDMA, CDMA2000, TD-SCDMA, LTE and WLAN export to antenna after treatment; Or for the multiple signal of communication received from antenna end is processed, and then carry out conjunction road with the CATV signal transmitted from CATV cable, last conjunction road signal carries out common cable passback by CATV cable again.
Further, described outdoor combiner unit comprises the first frequency-variable module, and first closes road module and second closes road module; Wherein,
First frequency-variable module, for active bi-directional frequency-variable module, for by bandwidth being the CDMA signal being positioned at 825-880MHz of 55MHz, raising frequency, to a certain specific idle frequency range in 960-1710MHz frequency range, is prepared for carrying out conjunction road with the signal of communication of other standards more afterwards; Or will the CDMA signals revivification of spare frequency bands be arranged in 825-880MHz;
First closes road module, for passive bidirectional closes road module, for by signals such as GSM, DCS, WCDMA, CDMA2000, TD-SCDMA, LTE, WLAN, conjunction road is carried out with the CDMA signal at specific idle frequency range place a certain in the first frequency-variable module raising frequency to 960-1710MHz frequency range, the frequency range of closing behind road is the mobile communication signal of 885-2700MHz, is transferred to the second conjunction road module by radio frequency coaxial-cable; Or, after closing the conjunction road Signal reception of the multimode communication signal that road module transmits from second, carry out filtering and forward along separate routes;
Second closes road module, is passive bidirectional module, for closing mobile communication combining signal that road module transmits by first and CATV TV signal carries out conjunction road, afterwards by CATV cable transmission to capping unit of registering one's residence; Or the signal transmitted from capping unit of registering one's residence is carried out shunt to forward.
Further, capping unit of registering one's residence described in comprises the first shunt module, the second shunt module and the second frequency-variable module; Wherein,
First shunt module, for passive bidirectional module, for receiving from outdoor combiner unit through conjunction road signal that CATV cable transmits, and be divided into two-way, wherein a road CATV signal is watched for user to TV by CATV cable transmission, an other road comprise multiple types, frequency range is that the mobile communication signal of 885-2700MHz is then transferred to the second shunt module by radio frequency coaxial-cable; Or, after the signal transmitted from user's TV and the second shunt module is carried out conjunction road, be back to outdoor combiner unit by CATV cable;
Second shunt module, for passive bidirectional module, for receiving mobile communication combining signal that transmit from the first shunt module, that comprise multiple types, and be divided into two-way, wherein a road is the CDMA signal through shift frequency of a certain specific idle frequency range being arranged in 960-1710MHz frequency range, is then transferred to the second frequency-variable module; An other road is remaining mobile communication signal, is launched by wide frequency antenna.Or, for being positioned at the CDMA signal of specific idle frequency range and carrying out conjunction road from the mobile communication signal that wide frequency antenna receives, return to the first shunt module afterwards;
Second frequency-variable module is active bi-directional frequency-variable module, and for the CDMA signal through shift frequency of a certain specific idle frequency range by being arranged in 960-1710MHz frequency range, down-conversion is reduced into the CDMA signal of normal frequency, is then launched by antenna; Or, the CDMA signal up-conversion received from antenna is returned to a certain specific idle frequency range in 960-1710MHz frequency range again.
The present invention also provides a kind of CATV of use cable to carry out the indoor method simultaneously covered of multiple signal of communication, the method can realize including but are not limited to CDMA, GSM, DCS, WCDMA, CDMA2000, TD-SCDMA, LTE, WLAN and carry out conjunction road at the CATV cable TV signal that the signal of communication of interior multiple types is 5-860MHz with frequency range simultaneously, realizes registering one's residence covering more afterwards by CATV cable co-cable transmission.
Further, as shown in Figure 2, down direction the method comprises:
To the signal of communication in the frequency range of 5-860MHz and CATV signal be dropped on, the present invention for CDMA standard signal, by active frequency-variable module up-conversion to a certain specific idle frequency range within the scope of 910-1710MHz.The mobile communication signal of the CDMA signal after up-conversion and other standards (including but not limited to GSM, DCS, WCDMA, CDMA2000, TD-SCDMA, LTE, WLAN etc.) and CATV TV signal to be carried out behind conjunction road by CATV cable transmission to capping unit of registering one's residence.The conjunction road signal received is divided into three tunnels by capping unit of registering one's residence: a road CATV signal, is watched to TV by CATV cable transmission for user; One tunnel is positioned at the CDMA signal of specific idle frequency range, after down-conversion reduction, export antenna to; One tunnel comprises the mobile communication combining signal of multiple types (including but not limited to GSM, DCS, WCDMA, CDMA2000, TD-SCDMA, LTE, WLAN etc.), is exported by wide frequency antenna;
Further, as shown in Figure 3, up direction the method comprises:
Register one's residence capping unit by the CDMA signal up-conversion that receives in a certain specific idle frequency range within the scope of 910-1710MHz, the CATV signal that the mobile communication signal of what the signal obtained after conversion and wide frequency antenna received comprise multiple types (including but not limited to GSM, DCS, WCDMA, CDMA2000, TD-SCDMA, LTE, WLAN etc.), CATV cable transmit carries out conjunction road, and the signal closed behind road is back to outdoor combiner unit by CATV cable; The signal that capping unit of registering one's residence transmits by outdoor combiner unit carries out forwarding along separate routes: by CATV cable transmission CATV signal wherein, the CDMA signal down-conversion in specific idle frequency range reduce and to return, by the shunt returning respectively of the signal of communication of other each standards (including but not limited to GSM, DCS, WCDMA, CDMA2000, TD-SCDMA, LTE, WLAN etc.).
The present invention does not limit to above-mentioned execution mode, and anyone can show that under enlightenment of the present invention other various forms of use CATV cables carry out the indoor system and method simultaneously covered of multiple signal of communication.All equalizations done according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (2)
1. use CATV cable to carry out the indoor system simultaneously covered of multiple signal of communication, it is characterized in that: comprise outdoor combiner unit and register one's residence capping unit; Wherein,
Outdoor combiner unit, for the signal of communication that will drop in the frequency range of CATV signal, after frequency-conversion processing, with the signal of communication do not dropped in CATV signal frequency range and CATV television signal combining, carry out co-cable transmission finally by CATV cable and register one's residence; Or, for from registering one's residence capping unit transmission Lai He road signal after treatment, carrying out shunt and forwarding;
Register one's residence capping unit, for the conjunction road signal transmitted from outdoor combiner unit along separate routes, wherein CATV signal is by CATV cable transmission to TV, and all the other signals of communication export to antenna after treatment; Or for the multiple signal of communication received from antenna end is processed, and then carry out conjunction road with the CATV signal transmitted from CATV cable, last conjunction road signal carries out common cable passback by CATV cable again;
Described outdoor combiner unit comprises the first frequency-variable module, and first closes road module and second closes road module; Wherein,
First frequency-variable module is active bi-directional frequency-variable module, and the idle frequency range of the signal of communication raising frequency tremendously high frequency for dropping in the frequency range of CATV signal, prepares for carrying out conjunction road with the signal of communication of other standards more afterwards; Or the signal of communication being arranged in the idle frequency range of high frequency is reduced to the frequency range dropping on CATV signal;
First closes road module, for passive bidirectional closes road module, for the signal of communication that will do not drop in CATV signal frequency range, carry out conjunction road with the signal of communication after the first frequency-variable module raising frequency, the mobile communication signal closed behind road is transferred to the second conjunction road module by radio frequency coaxial-cable; Or, after closing the conjunction road Signal reception of the multimode communication signal that road module transmits from second, carry out filtering and forward along separate routes;
Second closes road module, is passive bidirectional module, for closing mobile communication combining signal that road module transmits by first and CATV TV signal carries out conjunction road, afterwards by CATV cable transmission to capping unit of registering one's residence; Or the signal transmitted from capping unit of registering one's residence is carried out shunt to forward;
Described capping unit of registering one's residence comprises the first shunt module, the second shunt module and the second frequency-variable module; Wherein,
First shunt module, for passive bidirectional module, for receiving from outdoor combiner unit through conjunction road signal that CATV cable transmits, and be divided into two-way, wherein a road CATV signal is watched for user to TV by CATV cable transmission, and the mobile communication signal that an other road comprises multiple types is transferred to the second shunt module by radio frequency coaxial-cable; Or, after the signal transmitted from user's TV and the second shunt module is carried out conjunction road, be back to outdoor combiner unit by CATV cable;
Second shunt module, for passive bidirectional module, for receiving mobile communication combining signal that transmit from the first shunt module, that comprise multiple types, and be divided into two-way, wherein a road is by the signal of communication being positioned at the idle frequency range of high frequency after raising frequency, is then transferred to the second frequency-variable module; An other road is remaining mobile communication signal, is launched by wide frequency antenna; Or, for by the signal of communication being positioned at the idle frequency range of high frequency after raising frequency with carry out conjunction road from the mobile communication signal that wide frequency antenna receives, return to the first shunt module afterwards;
Second frequency-variable module is active bi-directional frequency-variable module, and for by by the signal of communication being positioned at the idle frequency range of high frequency after raising frequency, frequency reducing is reduced into the signal of communication of normal frequency, is then launched by antenna; Or, the signal of communication raising frequency in CATV frequency range of falling into received from antenna is returned after the idle frequency range of tremendously high frequency frequently again;
Described outdoor combiner unit and register one's residence between capping unit, by connecing the mode of power splitter, realizes the effect of a corresponding multiple capping unit of registering one's residence of outdoor combiner unit;
The idle frequency range of described high frequency is 960-1710MHz;
The frequency range of described CATV signal is 5-860MHz.
2. one kind uses CATV cable to carry out the indoor method simultaneously covered of multiple signal of communication, it is characterized in that: frequency range is had overlapping signal of communication with the frequency range of CATV signal, be converted to in the conflict free frequency of the frequency range of other signal transmissions, again itself and CATV signal are closed road with other signals of communication, carry out registering one's residence while co-cable transmission realizes multiple signal of communication quorum sensing inhibitor by CATV cable afterwards; Comprise down direction and up direction;
Described down direction the method comprises:
Signal of communication in the frequency range of CATV signal will be dropped on, by the idle frequency range of active frequency-variable module raising frequency tremendously high frequency; Signal of communication after raising frequency and the mobile communication signal of other standards and CATV TV signal to be carried out behind conjunction road by CATV cable transmission to capping unit of registering one's residence; The conjunction road signal received is divided into three tunnels by capping unit of registering one's residence: a road CATV signal, is watched to TV by CATV cable transmission for user; One tunnel is the signal of communication after the raising frequency being positioned at the idle frequency range of high frequency, after frequency reducing reduction, export antenna to; One tunnel comprises the mobile communication combining signal of multiple types, is exported by wide frequency antenna;
Described up direction the method comprises:
Register one's residence capping unit by idle for the signal of communication raising frequency tremendously high frequency in the frequency range dropping on CATV signal that receives frequency range, the CATV signal that the mobile communication signal of what the signal obtained after conversion and wide frequency antenna received comprise multiple types, CATV cable transmit carries out conjunction road, and the signal closed behind road is back to outdoor combiner unit by CATV cable; The signal that capping unit of registering one's residence transmits by outdoor combiner unit carries out forwarding along separate routes: by CATV cable transmission CATV signal wherein, the signal of communication frequency reducing of the raising frequency in idle for high frequency frequency range reduce and to return, by the shunt returning respectively of the signal of communication of other each standards;
The idle frequency range of described high frequency is 960-1710MHz;
The frequency range of described CATV signal is 5-860MHz.
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| CN103906079B (en) * | 2012-12-28 | 2018-02-23 | 中国移动通信集团江苏有限公司 | The indoor distributed system and its implementation that CATV merges with various wireless communication standard |
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| CN109413341A (en) * | 2018-11-20 | 2019-03-01 | 广州珠江数码集团股份有限公司 | A kind of internet of things networking method based on broadcasting and TV hfc plant |
| CN110958412A (en) * | 2019-12-04 | 2020-04-03 | 中邮科通信技术股份有限公司 | CATV network-based multichannel balanced transmission system |
| CN111614379A (en) * | 2020-05-15 | 2020-09-01 | 上海大学 | Active antenna distribution system based on coaxial cable network |
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