CN102223162A - Combiner/divider, and method and system for covering mobile signals of elevator - Google Patents
Combiner/divider, and method and system for covering mobile signals of elevator Download PDFInfo
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- CN102223162A CN102223162A CN2011101290915A CN201110129091A CN102223162A CN 102223162 A CN102223162 A CN 102223162A CN 2011101290915 A CN2011101290915 A CN 2011101290915A CN 201110129091 A CN201110129091 A CN 201110129091A CN 102223162 A CN102223162 A CN 102223162A
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Abstract
The invention provides a combiner/divider, and a method and a system for covering mobile signals of an elevator. The combiner/divider comprises an impedance matching module and a signal coupling module, wherein the impedance matching module is used for carrying out impedance conversion on ascending and descending mobile communication signals; the signal coupling module is used for separating the ascending and descending mobile communication signals which are coupled into corresponding video coaxial cables or corresponding wire telephone twisted-pair cables and used for coupling the ascending and descending mobile communication signals into the corresponding video coaxial cables or the corresponding wire telephone twisted-pair cables. By adoption of the combiner/divider, the mobile communication signals can be coupled into the original video coaxial cables or the original wire telephone twisted-pair cables in the elevator, so special wire-arranging construction is not required during the covering of signals of an elevator cage, and construction difficulty is reduced. Moreover, the arrangement of cables for specially transmitting wireless communication signals in an elevator well is not required, so investment cost is reduced.
Description
Technical field
The present invention relates to the mobile communication technology field, relate in particular to the method and the system thereof of a kind of combiner-divider, the covering of elevator movable signal.
Background technology
Along with the fast development of urban construction, rise residential and work in high level building are more and more.Stipulate in China's Code for design of dwelling houses: the height on seven layers and above dwelling house or the resident family outdoor design of inlet floor identity distance ground surpasses the above dwelling house of 16m elevator must be set.Elevator is as a special environment for use, its elevator hoistways body of wall is thicker, and lift car mostly is metal cabinet, and the mobile communication signal decay is serious, the mobile communication signal rapid fading phenomenon of turnover elevator is serious, so general mobile phone signal is fainter even do not have signal fully in the elevator.
Faint or even do not have the problem of signal in order to improve mobile phone signal in the elevator, at present, those skilled in the art mainly adopts following several mode:
1) is illustrated in figure 1 as the structural representation that hoistway trunk feeder top covers, in elevator hoistways 1, introduce a main feeder 2, wherein, main feeder 2 general employings 7/8 inch or 1/2 inch mobile communication dedicated coaxial cable, this main feeder 2 is fixed on elevator hoistways 1 inwall, and on this main feeder 2, connecting the signal that a coupler 3 is told certain power every 4～6 layer heights, coupler 3 is connected with directional antenna 4 (for example Yagi antenna) and carries out signal radiation, make wireless communication signals be full of whole elevator hoistways 1, and then be penetrated into realization signal covering in the lift car 5 by elevator hoistways 1.Be illustrated in figure 2 as the structural representation that hoistway trunk feeder bottom covers, it is identical on principle with Fig. 1, repeats no more here.Aforesaid way has the following disadvantages: (1) signal coverage goal is not direct, and a large amount of signal powers are wasted in the hoistway, therefore causes the investment waste; (2) engineering construction difficulty when introducing main feeder and connecting coupler and directional antenna 4 (for example Yagi antenna) in elevator hoistways on main feeder, needs to interrupt the elevator operation, is entered by the workman and carries out work high above the ground in the elevator hoistways; (3) there is certain potential safety hazard,, will seriously disturbs the elevator operation, cause serious accident in case the coupler or the directional antenna that are provided with in the elevator hoistways come off;
2) as shown in Figure 3, adopt the mode of elevator hall, promptly, carry out signal with 6 pairs of lift cars of this antenna 5 and cover at the ceiling mounted antennas 6 on 7 doorways, every layer of elevator hall.The deficiency of this mode has: (1) elevator hall cabling difficulty, and difficulty of construction is big; (2) the closed twinkling signal of lift car decreases notably, and easily causes call drop; (3) because the antenna covering radius is limited, be not suitable for a fairly large number of occasion of elevator.
3) as shown in Figure 4, adopt the mode of leaky cable, in each elevator hoistways 1, lay a vertical leakage cable 8, directional antenna 4 (for example Yagi antenna) is installed in the upper end or the lower end of leakage cable along hoistway.Also can be as shown in Figure 5, in upper end or the lower end installation power load 9 of revealing cable.Can also use in conjunction with trunk as shown in Figure 6.Adopt to reveal the mode of cable, cover though can well carry out signal to lift car 5,, it exists reveals cable and costs an arm and a leg, and causes investment high, and in elevator hoistways the big problem of difficulty of construction.
4) as shown in Figure 7, adopt the mode of retinue direct amplification machine, one secondary directional antenna 4 (for example Yagi antenna) promptly is installed at the top of each elevator hoistways 1, by this directional antenna 4 (for example Yagi antenna) radiation signal in elevator hoistways 1, the one secondary directional antenna 12 (for example Yagi antenna) that receives is installed on the lift car 5 of correspondence simultaneously, receive the signal in the elevator hoistways 1, and with the signal that receives after a direct amplification machine 10 amplifies, carry out signal by the 11 pairs of lift cars of retransmitting antenna 5 in the lift car 5 again and cover.Certainly, also can be as shown in Figure 8, a direct amplification machine 13 that is connected with directional antenna 4 (for example Yagi antenna) is set at the top of elevator hoistways 1, transmits by frequency-shift signaling between lift car side direct amplification machine and the elevator hoistways top direct amplification machine like this, avoid self-excitation to disturb.This kind mode has following deficiency: (1) requires the higher power of elevator hoistways top directional antenna output; (2) retinue direct amplification machine service behaviour is had relatively high expectations, at the uneasy at that time interference base station of signal controlling; (3) this kind signal soverlay technique is still immature at present.
5) as shown in Figure 9, adopt the mode of retinue cable, i.e. the special retinue cable 15 that is used for transmitting mobile communication signal that moves with lift car, i.e. cable, optical cable or the category-5 cable of being provided with in hoistway.Have the following disadvantages for this kind mode: need close down elevator for a long time during (1) cable wiring manufacture; (2) these special cables that are used for transmitting mobile communication signal that are provided with bend with the up-downgoing of elevator, are prone to decreased performance (as the increase of cable standing wave, the increase of optical cable light decay etc.) in the course of time, even the problem that core fractures occurs.In addition, for the mode of optical cable and category-5 cable, two ends all need to be provided with source device, cause the cost problem of higher, and particularly for the mode of category-5 cable, its two ends also need to add down-conversion and digital processing device, and its equipment manufacturing cost can be higher.
Summary of the invention
The invention provides method and system thereof that a kind of combiner-divider, elevator movable signal cover, the engineering construction difficulty that exists in the prior art is big, cost of investment is high to solve, there is hidden danger in elevator safety operation and can produces the problem of disturbing to the base station.
The invention provides the method that a kind of elevator movable signal covers, comprising:
First impedance matching module is carried out impedance conversion to descending mobile communication signal;
Second impedance matching module is carried out the impedance inverse transformation to the descending mobile communication signal that carries out impedance conversion through described first impedance module;
Described second impedance matching module is also carried out impedance conversion to up mobile communication signal;
Described first impedance matching module is also carried out the impedance inverse transformation to the up mobile communication signal that carries out impedance conversion through described second impedance;
The first signal coupling module will be through described first impedance matching module, carry out described descending mobile communication signal after the impedance conversion and be coupled into video coaxial cable or telephone twisted-pair feeder in the elevator, the up mobile communication signal that also will be coupled in described video coaxial cable or the described telephone twisted-pair feeder is separated, and transfers to described first impedance matching module;
The described descending mobile communication signal that the secondary signal coupling module will be coupled in described video coaxial cable or the described telephone twisted-pair feeder is separated, and transfer to described second impedance matching module, also will be through described second impedance matching module, the described up mobile communication signal that carries out after the impedance conversion is coupled into described video coaxial cable or described telephone twisted-pair feeder.
The present invention also provides a kind of combiner-divider, comprising:
Impedance matching module is used for the uplink and downlink mobile communication signal is carried out impedance conversion;
The signal coupling module is used for the uplink and downlink mobile communication signal that is coupled in video coaxial cable or the telephone twisted-pair feeder is separated; Also be used for the uplink and downlink mobile communication signal is coupled into described video coaxial cable or described telephone twisted-pair feeder.
The present invention also provides a kind of elevator movable signal covering system, comprise two above-mentioned combiner-dividers, two one of described combiner-dividers are the far-end combiner-divider, another is the near-end combiner-divider, described near-end combiner-divider is arranged at outside the elevator hoistways, described far-end combiner-divider is arranged on the lift car, and described far-end combiner-divider and described near-end combiner-divider are connected with the corresponding video coaxial cable or the telephone twisted-pair feeder of elevator.
The method that elevator movable signal provided by the invention covers, be that mobile communication signal is coupled in the elevator in original video coaxial cable or the telephone twisted-pair feeder, adopt this kind method can carry out special cable wiring manufacture again, therefore reduced difficulty of construction, caused a hidden trouble also can for simultaneously the safe operation of elevator.And, owing to need in elevator hoistways, not lay the cable of special transmit wireless communication signal, therefore reduced input cost.Also have, wireless communication signals along cable transmission, has been avoided occurring existing the problem of disturbing to take place to the base station in elevator hoistways.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural representation that hoistway trunk feeder top covers;
Fig. 2 is the structural representation that hoistway trunk feeder bottom covers;
Fig. 3 is the structural representation of the mode of employing elevator hall;
Fig. 4 is for installing the leaky cable mode structural representation of directional antenna;
Fig. 5 is the leaky cable mode structural representation of installation power load;
Fig. 6 is the leaky cable mode structural representation that uses in conjunction with trunk;
Fig. 7 is for adopting the structural representation of direct amplification machine mode;
Fig. 8 is provided with the structural representation of direct amplification machine for the elevator hoistways top;
Fig. 9 is for adopting the structural representation of retinue cable mode;
Figure 10 divides the structural representation of mixer embodiment for the present invention;
Figure 11 is the structural representation of elevator movable signal covering system embodiment 1 of the present invention;
Figure 12 is near, far-end combiner-divider operation principle schematic diagram;
Figure 13 is the structural representation of wireless direct amplification machine for signal source;
Figure 14 is the structural representation of elevator movable signal covering system embodiment 2 of the present invention;
Figure 15 is the theory diagram of signal-conversion equipment and signal inverse transformation device.
Reference numeral:
The 1-elevator hoistways; The 2-main feeder; The 3-coupler;
The 4-directional antenna; The 5-lift car; 6,23-antenna;
The 7-elevator hall; 8-reveals cable; The 9-power termination;
10,13-direct amplification machine; The 11-retransmitting antenna; 12-receives directional antenna;
The 14-impedance matching module; The 15-cable of accompanying; 16-signal coupling module;
The 17-near-end divides mixer; 18-distal portion mixer; The 19-elevator(lift) machine room;
The 20-antenna; The 21-signal source; The 22-signal-conversion equipment;
The inverse transformation of 24-signal is established
Be equipped with.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
The embodiment of the method that elevator movable signal of the present invention covers comprises:
First impedance matching module is carried out impedance conversion to descending mobile communication signal;
Second impedance matching module is carried out the impedance inverse transformation to the descending mobile communication signal that carries out impedance conversion through described first impedance module;
Described second impedance matching module is also carried out impedance conversion to up mobile communication signal;
Described first impedance matching module is also carried out the impedance inverse transformation to the up mobile communication signal that carries out impedance conversion through described second impedance;
The first signal coupling module will be through described first impedance matching module, carry out described descending mobile communication signal after the impedance conversion and be coupled into video coaxial cable or telephone twisted-pair feeder in the elevator, the up mobile communication signal that also will be coupled in described video coaxial cable or the described telephone twisted-pair feeder is separated, and transfers to described first impedance matching module;
The described descending mobile communication signal that the secondary signal coupling module will be coupled in described video coaxial cable or the described telephone twisted-pair feeder is separated, and transfer to described second impedance matching module, also will be through described second impedance matching module, the described up mobile communication signal that carries out after the impedance conversion is coupled into described video coaxial cable or described telephone twisted-pair feeder.
Adopt said method, be that mobile communication signal is coupled in the elevator in original video coaxial cable or the telephone twisted-pair feeder, adopt this kind method can carry out special cable wiring manufacture again, therefore reduced difficulty of construction, cause a hidden trouble also can for simultaneously the safe operation of elevator.And, owing to need in elevator hoistways, not lay the cable of special transmit wireless communication signal separately, therefore reduced input cost.Also have, wireless communication signals along cable transmission, has been avoided occurring existing the problem of disturbing to take place to the base station in elevator hoistways.
At present, the general coaxial cable that adopts 75 Ω-3D or 75 Ω-5D of video monitoring baseband signal transmission, owing to adopt copper core and tyre gauze screen in the middle of such cable, therefore its signal attenuation is little, antijamming capability is strong, and transmission range video signal quality in 200 meters (about 70 floors) does not have obvious decline.Twisted-pair feeder is the balance transmission mode of 100 Ω, utilizes two opposite characteristics of cable signal equal direction to suppress external disturbance, and transmission range is at 0-1500 rice.These two kinds of cables all have outfit in existing elevator trailing cable.The transmission of adopting above-mentioned two kinds of cables to carry out mobile communication signal is little to the change of existing elevator, and the engineering construction amount is little, is easy to realize.But, be 50 ohm radio-frequency transmission line because mobile communication radio frequency signal requires characteristic impedance, and above-mentioned video monitoring cable be characteristic impedance is 75 ohm a coaxial cable, and twisted-pair feeder is 100 ohm a balance transmission.Therefore, radio frequency or intermediate frequency mobile communication signal need be done the impedance conversion of 50 Ω-75 Ω or 50 Ω-100 Ω, make the impedance that is transmitted in the mobile communication signal in video coaxial cable, the telephone twisted-pair feeder be converted to 75 Ω, 100 Ω accordingly, to satisfy the requirement of signal transmission.
When movable signal was coupled into video coaxial cable or telephone twisted-pair feeder, because the video monitoring signal bandwidth is 0～6MHz, the speech signal bandwidth that telephone transmits was below 200KHz, and it all belongs to the category of baseband signal.And mobile communication 2G signal mainly concentrates between 800～960MHz, and signal bandwidth is at 1710～1850MHz for another frequency range of 2G (being the DCS system), and the 3G signal is near 1810～2170MHz.At present, part mobile communication equipment (as digital optical fiber repeater) is down-converted to the radiofrequency signal of mobile communication in intermediate frequency 70～140MHz scope and handles on certain frequency.Therefore; quite long protection bandwidth is all arranged between above-mentioned base band, intermediate frequency, radiofrequency signal; therefore in same transmission cable when transmission of video pilot signal, telephone signal and wireless communication signals; can not disturb between them, guarantee the quality of each signal transmission forming each other.
Also have, before described descending mobile communication signal carries out impedance conversion, described descending mobile communication signal is carried out analog-to-digital conversion, after described up mobile communication signal carries out the impedance inverse transformation, described up mobile communication signal is carried out digital-to-analogue transform; After described descending mobile communication signal carries out the impedance inverse transformation, described descending mobile communication signal is carried out digital-to-analogue transform, before described up mobile communication signal carries out impedance conversion, described up mobile communication signal is carried out analog-to-digital conversion.Here said impedance conversion is meant, according to the difference of using cable, characteristic impedance is transformed to and corresponding 75 Ω of cable characteristic impedance or 100 ohm by 50 Ω, and the impedance inverse transformation is meant the inverse process of above-mentioned impedance conversion, is about to be converted to 50 Ω with corresponding 75 Ω of cable characteristic impedance or 100 ohm.
Above-mentioned uplink and downlink mobile communication signal is carried out after D/A transforms, the uplink and downlink mobile communication signal that transmits on video coaxial cable is digital signal, adopt digital signal to transmit all lossy little, antijamming capability is strong, relatively is fit to use, retinue cable long, the speed of service fast high rise elevator higher at floor.
It is to be noted in addition, because the restriction of video coaxial cable and telephone twisted-pair feeder own characteristic, the uplink and downlink mobile communication signal is before carrying out the D/A conversion, when being analog signal, can only carry out the coupled transfer of signal with video coaxial cable, and after carrying out the digitlization conversion, it both can carry out the coupled transfer of signal with video coaxial cable, can carry out the coupled transfer of signal again with the telephone twisted-pair feeder.
As shown in figure 10, the structural representation of combiner-divider embodiment of the present invention comprises impedance matching module 14 and signal coupling module 16.
As shown in figure 11, the structural representation of elevator movable signal covering system embodiment 1 of the present invention comprises two combiner-dividers, and a combiner-divider is arranged in the elevator(lift) machine room 19, and another combiner-divider is arranged on the lift car.Two combiner-dividers all are connected with video coaxial cable in the elevator.The combiner-divider that is positioned at elevator(lift) machine room is a near-end combiner-divider 17, and the combiner-divider that is positioned on the lift car is a far-end combiner-divider 18.Near-end divides mixer 17 to be used for the mobile communication signal (being descending mobile communication signal) of signal source 21 is coupled into video coaxial cable, also is used for up mobile communication signal is separated in video coaxial cable.Far-end combiner-divider 18 is used for the descending mobile communication signal that is coupled in the video coaxial cable is separated from video coaxial cable, and the antenna in being arranged on lift car 5 20 comes lift car 5 is carried out the signal covering, also be used for the mobile phone signal that antenna 20 receives is coupled into video coaxial cable, form up mobile communication signal.For the quantity that reduces equipment in the elevator and improve beautifying property in the lift car, antenna 20 and monitoring camera in the elevator can be integral.
As a special case, as shown in figure 13, above-mentioned signal source 21 can be wireless direct amplification machine, obtain the mobile communication signal that send the base station by the antenna 23 that is erected at the elevator(lift) machine room outside, and the mobile communication signal that it obtains is transferred to wireless direct amplification machine, wireless direct amplification machine carries out power amplification to above-mentioned mobile communication signal, and then is coupled into video coaxial cable through the near-end combiner-divider.
As shown in figure 12, the operation principle schematic diagram of near, far-end combiner- divider 17,18, this part is an example to utilize the video coaxial cable to transmit mobile communication signal.Descending mobile communication signal, i.e. mobile communication signal from base station transmits to near-end combiner-divider 17, at first carry out the conversion of impedance through the impedance matching module of near-end combiner-divider 17, the impedance transition that makes its radiofrequency signal is 75 Ω, afterwards, the signal coupling module of near-end combiner-divider 17 is coupled to above-mentioned descending mobile communication signal in the video coaxial cable, and transmits to the far-end combiner-divider.For same signal flow, it is opposite that distal portion mixer 18 divides the course of work of mixer 17 with near-end, the signal coupling module that is distal portion mixer 18 is separated above-mentioned descending mobile communication signal in video coaxial cable, and make its impedance be converted to 50 Ω again, promptly carry out the impedance inverse transformation.
For up mobile communication signal, promptly far-end combiner-divider 18 is coupled to video coaxial cable with mobile phone signal (being up mobile communication signal) and vision signal input, and then by near-end combiner-divider 17 mobile phone signal and vision signal output is separated.This process is identical with the operation principle of said process, repeats no more here.
As shown in figure 14, the structural representation of elevator movable signal covering system embodiment 2 of the present invention on the basis of the foregoing description, is provided with signal-conversion equipment 22 between near-end combiner-divider and signal source; Between far-end combiner-divider and antenna, be provided with signal inverse transformation device 24.
Wherein, the theory diagram of signal-conversion equipment 22 and signal inverse transformation device 24 as shown in figure 15.For signal-conversion equipment 22, it comprises duplexer, and duplexer separates the uplink and downlink mobile communication signal, guarantees uplink and downlink mobile communication signal operate as normal simultaneously.In signal-conversion equipment 22, descending mobile communication signal carries out down-converted through down conversion module DCM, make analog radio-frequency signal be downconverted to intermediate frequency, change above-mentioned intermediate-freuqncy signal into digital signal by analog-to-digital conversion module ADC then, and carry out Filtering Processing by descending digital filtering module DDC, with after the signal of filtering again after group/decoding and signal condition module are handled accordingly, transfer to the near-end combiner-divider and be coupled into video coaxial cable.For the up mobile communication signal that divides mixer to separate through near-end, after it is at first handled accordingly through group/decoding and signal condition module, again after upstream digital filtration module DUC carries out filtering, DAC is converted into analog if signal by the digital-to-analogue conversion module, by up-conversion module UCM this analog if signal is upconverted to radiofrequency signal more subsequently, and finally send through duplexer.
For signal inverse transformation device 24, its principle and signal-conversion equipment 22 are basic identical.Its difference only is, is provided with amplifier PA between up-conversion module and duplexer the descending mobile communication signal after up-conversion is carried out power amplification; Between down conversion module and duplexer, be provided with low noise amplifier LNA up mobile communication signal is carried out the small-signal amplification.
It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (5)
1. the method that the elevator movable signal covers is characterized in that, comprising:
First impedance matching module is carried out impedance conversion to descending mobile communication signal;
Second impedance matching module is carried out the impedance inverse transformation to the descending mobile communication signal that carries out impedance conversion through described first impedance module;
Described second impedance matching module is also carried out impedance conversion to up mobile communication signal;
Described first impedance matching module is also carried out the impedance inverse transformation to the up mobile communication signal that carries out impedance conversion through described second impedance;
The first signal coupling module will be through described first impedance matching module, carry out described descending mobile communication signal after the impedance conversion and be coupled into video coaxial cable or telephone twisted-pair feeder in the elevator, the up mobile communication signal that also will be coupled in described video coaxial cable or the described telephone twisted-pair feeder is separated, and transfers to described first impedance matching module;
The described descending mobile communication signal that the secondary signal coupling module will be coupled in described video coaxial cable or the described telephone twisted-pair feeder is separated, and transfer to described second impedance matching module, also will be through described second impedance matching module, the described up mobile communication signal that carries out after the impedance conversion is coupled into described video coaxial cable or described telephone twisted-pair feeder.
2. the method that elevator movable signal according to claim 1 covers is characterized in that,
Before described descending mobile communication signal carries out impedance conversion, described descending mobile communication signal is carried out analog-to-digital conversion, after described up mobile communication signal carries out the impedance inverse transformation, described up mobile communication signal is carried out digital-to-analogue transform;
After described descending mobile communication signal carries out the impedance inverse transformation, described descending mobile communication signal is carried out digital-to-analogue transform, before described up mobile communication signal carries out impedance conversion, described up mobile communication signal is carried out analog-to-digital conversion.
3. a combiner-divider is characterized in that, comprising:
Impedance matching module is used for the uplink and downlink mobile communication signal is carried out impedance conversion;
The signal coupling module is used for the uplink and downlink mobile communication signal that is coupled in corresponding video coaxial cable or the telephone twisted-pair feeder is separated; Also be used for the uplink and downlink mobile communication signal is coupled into corresponding described video coaxial cable or described telephone twisted-pair feeder.
4. elevator movable signal covering system, it is characterized in that, comprise two as combiner-divider as described in the claim 3, two one of described combiner-dividers are the far-end combiner-divider, another is the near-end combiner-divider, described near-end combiner-divider is arranged at outside the elevator hoistways, described far-end combiner-divider is arranged on the lift car, and described far-end combiner-divider and described near-end combiner-divider are connected with the corresponding video coaxial cable or the telephone twisted-pair feeder of elevator.
5. elevator movable signal covering system according to claim 4 is characterized in that, also comprises:
Chromacoder is connected with the near-end combiner-divider, is used for descending mobile communication signal is carried out analog-to-digital conversion, and is used for up mobile communication signal is carried out digital-to-analogue conversion;
The signal inverter is connected with the far-end combiner-divider, is used for described up mobile communication signal is carried out analog-to-digital conversion, and is used for described descending mobile communication signal is carried out digital-to-analogue conversion.
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| CN108040237A (en) * | 2015-07-24 | 2018-05-15 | 金钱猫科技股份有限公司 | A kind of Video Monitor System of achievable data priority distribution |
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| CN114142198A (en) * | 2021-12-16 | 2022-03-04 | 西安梅隆控制工程有限责任公司 | Single leakage cable with multipath effect and construction method |
| CN115278575A (en) * | 2022-09-26 | 2022-11-01 | 深圳国人无线通信有限公司 | Method and system for realizing signal coverage of elevator mobile network |
| CN115361309A (en) * | 2022-10-24 | 2022-11-18 | 深圳国人无线通信有限公司 | Split type elevator communication system capable of being remotely monitored |
| CN115361309B (en) * | 2022-10-24 | 2022-12-27 | 深圳国人无线通信有限公司 | Split type elevator communication system capable of being remotely monitored |
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| CN102223162B (en) | 2013-11-20 |
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