CN202269021U - Multi-system access platform for airport communication - Google Patents
Multi-system access platform for airport communication Download PDFInfo
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- CN202269021U CN202269021U CN2011203987676U CN201120398767U CN202269021U CN 202269021 U CN202269021 U CN 202269021U CN 2011203987676 U CN2011203987676 U CN 2011203987676U CN 201120398767 U CN201120398767 U CN 201120398767U CN 202269021 U CN202269021 U CN 202269021U
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Abstract
A multi-system access platform for airport communication comprises a downlink signal portion and an uplink signal portion. The downlink portion comprises a downlink front level filtering branch, two downlink back level five-frequency combiners arranged in symmetrical mode and more than two downlink filters and isolators. The uplink signal portion comprises an uplink front level filter branch, two uplink back level four-frequency combiners arranged in symmetrical mode and more than two uplink filters. The multi-system access platform for the airport communication adopts a scheme of combining the uplink signal portion, the downlink signal portion and a rear end, uses connection of internal equipment such as the combiner, the isolator, a power divider, the filter, a bridge and the like, and integrates and divides signals into two branches to be connected with an antenna feeder. Branching and integrating of global system for mobile communication (GSM), code division multiple access (CDMA), TETRA, airport communication TETRA, a digital television, a cell phone television and integrated digital enhanced network (IDEN) access of a plurality of operators are achieved, and technical problems of repeated construction of antennas and intense pipeline resources in a mobile communication door in airport conduction are solved.
Description
Technical field:
The utility model relates to electricity field, relates in particular to the application of the communication technology, is a kind of multi-system access platform that is used for airport communication, is used for covering for the multi-modulation scheme movable signal of airport scope.
Background technology:
Personal mobile communication obtains swift and violent development in the whole world, multiple mobile communication standards such as GSM, DCS, CDMA, TD-SCDMA, WCDMA are arranged, and has formed multi-operator, the wireless network of multi-modulation scheme.In places such as airports, not only there is the public network of multi-modulation scheme to insert, also have private networks such as DTV, mobile TV, public security fire-fighting to insert requirement.At the mobile communications network first stage of construction, the covering of indoor signal mainly relies on outdoor grand station to solve, because building is to the shielding of movable signal; In the indoor part signal blind area that formed, in some building, because number of users is bigger; Traffic density is high; Only rely on outdoor grand station to absorb and can't meet the demands, and the leading signal of indoor nothing, be easy to generate various interference and ill effect.Indoor covering system is introduced the signal of mobile base station through the compartment system that utilizes domestic aerial indoor, guarantees the good covering of indoor signal, and can absorb the traffic of indoor section fully, alleviates the traffic pressure at outdoor grand station.In the prior art, indoor covering construction is built by each operator's autonomous investment.Because to same building, possibly all there is access demand in each operator, causes situation such as repeated construction, line resource anxiety to a certain extent.
Summary of the invention:
The purpose of the utility model is to provide a kind of multi-system access platform that is used for airport communication; The multiple wireless signal that the described this multi-system access platform that is used for airport communication will solve each operator in the prior art Aerodrome Construction closes the road, and uses same set of antenna-feedback system whole terminal to be carried out the technical problem of all standing.
This multi-system access platform that is used for airport communication of the utility model, the mode that adopts the uplink and downlink link signal to divide cable independently to cover; The mode that TD-SCDMA will adopt the back level to close the road covers.Wherein, described downstream signal section comprises that the first order of descending input is an isolator; The second level is downstream filter, and the number of described downstream filter is identical with described isolator number, and downstream filter and isolator connect one to one, and the third level is that prime is closed road and shunt.Described descending prime filtering along separate routes, close the route power splitter and the 3dB electric bridge is realized.If (it is that two tunnel same frequencies close the road that prime is closed the road, carries out two afterwards more along separate routes, then can adopt the 3dB electric bridge to realize closing the road; If it is that two road alien frequencies close the road that prime is closed the road, carry out two afterwards more along separate routes, then can adopt close earlier the road more along separate routes mode realize), the fourth stage closes the road mode for the back level, two symmetrically arranged descending back level five frequency combiners.Any downstream filter all is connected to described descending prime filtering along separate routes, and descending prime filtering is connected with described two descending back level five frequency combiners along separate routes.
Described upward signal part is in the opposite direction with downstream signal, comprises that input signal earlier through level mixer, two symmetrically arranged up four frequency combiners after the system, is the upstream filter of up prime filtering shunt and two above numbers then.Described up prime filtering along separate routes, close the route power splitter and form with the 3dB electric bridge, any upstream filter all is connected to described up prime filtering along separate routes, up prime filtering is connected with described two up back grade four frequency combiners along separate routes.
Further; Described downstream signal along separate routes, close and be provided with a power divider (abbreviation power splitter) in the road; Be connected with a downstream filter on the described power splitter; This downstream filter is passed through to be connected with mobile TV signal output antenna behind the isolator, and power splitter is connected with described two descending back level five frequency combiners again.
Further, be provided with a power splitter in the described upward signal part, be connected with a upstream filter on the described power splitter.
Further, be provided with a TD mixer in the described downstream signal section, described TD mixer is arranged on the rear end of downstream signal section.
Further, described downstream signal section is arranged in the descending casing, and described upward signal partly is arranged in the up casing.
Further, described descending casing and up casing are arranged in the rack.
Further, described descending casing and up casing are provided with panel separately, are provided with cable joint in the described panel separately.
Further, the cable joint in the descending casing on the panel is connected with isolator through cable, and the cable joint in the up casing on the panel is connected with upstream filter through cable.
The utility model and prior art are compared, and its effect is actively with tangible.The utility model adopts upward signal part, downstream signal section and rear end to close the scheme on road, and the connection of internal units such as utilization mixer, isolator, power splitter, filter, electric bridge is divided into two the road with signal integration and is connected to antenna feeder.Insert standard realization deciliter road to moving GSM900, DCS1800, TD-SCDMA (A+F), the GSM900 of UNICOM, DCS1800, WCDMA, telecommunications CDMA800, TETRA, airport communication TETRA, DTV, mobile TV and IDEN; And can curb the useless interfering components between each frequency band, solved mobile communication indoor antenna repeated construction in the Aerodrome Construction in the prior art, the nervous technical problem of line resource.
Description of drawings:
Fig. 1 is the sketch map of downstream signal section of the multi-system access platform that is used for airport communication of the utility model.
Fig. 2 is the upward signal sketch map partly of the multi-system access platform that is used for airport communication of the utility model.
Fig. 3 is the sketch map of panel of the descending casing of multi-system access platform that is used for airport communication of the utility model.
Fig. 4 is the sketch map of panel of the up casing of multi-system access platform that is used for airport communication of the utility model.
Embodiment:
Embodiment 1:
As depicted in figs. 1 and 2; The multi-system access platform that is used for airport communication of the utility model; Comprise downlink portion and uplink portion; Wherein, described downstream signal section comprises descending prime the filtering downstream filter 3 and the isolator 4 of 1, two symmetrically arranged descending back level, five frequency combiners 2, two above numbers along separate routes, and the number of described isolator 4 is identical with the number of described downstream filter 3; Isolator 4 connects one to one with downstream filter 3; Described descending prime filtering 1 is made up of power splitter and 3dB electric bridge along separate routes, and any downstream filter 3 all is connected to described descending prime filtering along separate routes 1, descending prime filtering along separate routes 1 with described two descending after grade five frequency combiners 2 be connected; Described upward signal partly comprises the upstream filter 9 of 7, two symmetrically arranged up back level four frequency combiners 8 of up prime filtering shunt and two above numbers; Described up prime filtering 7 is made up of power splitter and 3dB electric bridge along separate routes, and any upstream filter 9 all is connected to described up prime filtering along separate routes 7, up prime filtering along separate routes 7 with described two up after grade four frequency combiners 8 be connected.
Further; Be provided with a power splitter 5 in the described downstream signal section; Be connected with a downstream filter 6 on the described power splitter 5; This downstream filter 6 is passed through to be connected with mobile TV signal output antenna behind the isolator, and power splitter 5 is connected with described two descending back level five frequency combiners 2 again.
Further, be provided with a power splitter 10 in the described upward signal part, be connected with a upstream filter on the described power splitter 10.
Further, be provided with a TD mixer in the described downstream signal section, described TD mixer is arranged on the rear end of downstream signal section.
Further, described downstream signal section is arranged in the descending casing, and described upward signal partly is arranged in the up casing.
Further, described descending casing and up casing are arranged in the rack.
Like Fig. 3 and shown in Figure 4, further, described descending casing and up casing are provided with panel separately, are provided with cable joint in the described panel separately.
Further, the cable joint in the descending casing on the panel is connected with isolator through cable, and the cable joint in the up casing on the panel is connected with upstream filter 9 through cable.
Concrete; In an embodiment of the utility model, the introducing demand of airport terminal comprise move GSM900, DCS1800, TD-SCDMA, the GSM900 of UNICOM, DCS1800, WCDMA, telecommunications CDMA800, TETRA, airport communication TETRA, in the arteries and veins IDEN that defends the country; DTV and mobile TV etc.If every family independently builds an indoor distributed system in the operation commercial city, will inevitably cause overlapping investment so, and engineering construction is caused difficulty.Adopt a kind of new technology, new coverage mode is that multisystem inserts and to close channel platform (POI) at present, the multiple wireless signal of each operator is closed the road, and use same set of antenna-feedback system that whole terminal is carried out all standing.
The technical scheme of present embodiment is: each subsystem is shared same compartment system, the mode that when design, adopts uplink and downlink to divide cable independently to cover; TD-SCDMA will adopt the back level to close the mode on road, and WCDMA also will carry out prime through POI and close the road; Adopt mixer, the filter of high-quality, high selectivity simultaneously, and with the dual-mode antenna installation that keeps at a certain distance away, to guarantee isolation enough between each system.Because the signal access of multiband can cause producing Harmonic Interference and Intermodulation Interference between each subsystem, wherein mainly is the Intermodulation Interference that descending multi-band signal causes the system uplink small-signal in the third-order intermodulation product of closing passive devices such as path filter, power splitter, coupler.In order to suppress Intermodulation Interference and clutter interference, so this programme part connecting system (like digital TV etc.), need transform the existing standard device.
With the downstream signal is that example is analyzed the equipment Insertion Loss; When with system quantity frequently at 2 when following; Because only need 1 grade of electric bridge to carry out with frequently closing the road, its Insertion Loss value comprises that mainly the electric bridge level distributes 3dB, alien frequencies signal frequency range mixer Insertion Loss 1dB; And the loss of other duplexers, isolator and line, overall Insertion Loss representative value is between the 5.5dB to 6dB.
According to measuring and calculating, consider insert POI after insertion loss bigger, and the working frequency range of TD-SCDMA is higher, the loss on compartment system feeder line route is very big, reach the requirement of the antenna opening power of system, must reduce the influence of POI Insertion Loss for the 3G system.Simultaneously, the TD-SCDMA system is the TDD system, and equipment provides the port of 1-8 road transmit-receive sharing, is difficult to insert the POI system that transmitting-receiving separates.Take all factors into consideration above-mentioned factor, TD-SCDMA will adopt the back level to close the mode on road, Insertion Loss≤1.5dB;
If WCDMA adopts 2 ports to close the road in POI, Insertion Loss has 3dB, with the level combination loss is suitable thereafter.Therefore WCDMA also will close the road through the prime of carrying out of POI.The road is all closed through POI by all the other systems.See the following form:
In view of present embodiment is the distributed antenna transmission system that multisystem mixing is built; The spurious signal of each system itself and since the non-linear multisystem inter-modulated signal that causes of device and equipment can the quality of each system be impacted; Therefore must adopt device, equipment in this POI system, thereby satisfy the technical requirement of multisystem mixing with high anti-interference rejection index.
Below be the analysis of 3 kinds of Anti-Jamming Techniques of multisystem mixing access platform:
A) barrage jamming inhibition analysis: the outer strong signal of the band that each system of this engineering is received must be lower than the obstruction thresholding, specifically blocks threshold requirement and is classified as follows:
According to the 3GPP relevant criterion, GSM and DCS1800 two systems are for the requirement of barrage jamming;
Cdma system is for the requirement of barrage jamming: the single-frequency of RF input port input off-center frequency is disturbed in the base station, and when single-frequency was disturbed in off-center frequency ± 750kHz, input single-frequency interference power was higher than travelling carriage simulator power output 50dB; When single-frequency was disturbed in off-center frequency ± 900kHz, input single-frequency interference power was higher than travelling carriage simulator power output 87dB.
The WCDMA system is to the requirement of each interference:
The TETRA system is for the requirement of barrage jamming: receiver blocks threshold level:＜-13dBm
Inhibition for the barrage jamming of whole system can only realize through the channel isolation of multiplefrequency mixer.If the strangler of system requirements is limited to x dBm, the isolation of multiplefrequency mixer is y dBm, and the emissive porwer of interference signal is z dBm, z-y≤x is then arranged, y>=z-x.According to calculating; In this engineering institute design system; Require each system interval from degree y >=60dB; Thereby can see and eliminate barrage jamming promptly have only isolation can satisfy the requirement of clutter interference to the requirement of the isolation of indoor covering system not high (less than clutter interference), then it one satisfy barrage jamming surely requirement.
B) the clutter interference inhibition analysis is according to the related protocol standard, and it is following that each system drops on the spurious signal intensity collating sort of other system:
GSM/DCS honeycomb sender is spuious;
The cdma cellular sender is spuious;
WCDMA honeycomb sender is spuious;
Consider that the signal source that inserts in the indoor covering system comprises base station and various activated amplifier (repeater, dried put etc.), and the performance index of repeater have than big-difference than base station equipment.For this reason, the performance index of the compatible repeater of the clutter interference between system, each subsystem sees the following form in the clutter interference of other frequency ranges:
For fear of clutter interference system is impacted, this technical scheme requires the spurious signal of system's passband to disturb less than thermal noise power, and its implementation is following two kinds:
Each interchannel isolation of one of which, raising equipment itself;
Two, adopt up-downgoing mode along separate routes, increase the space isolation and the link load of downstream signal to data feedback channel.
Therefore the band between each communication system is restrained requirement outward and is seen the following form:
C) though analyzing the inner TD-SCDMA of native system, Intermodulation Interference adopt the back level to close the road at system uplink; But because TDD is close to FDD frequency range 1920-1980MHz on the 1880-1920MHz frequency range; Therefore TD-SCDMA is descending bigger to the up clutter interference of FDD, and owing to do not protect frequency interval, only depends on device to realize that the isolation difficulty is very big; Therefore relevant operator should isolate the middle protection frequency band of 20MHz when frequency planning under the prerequisite of guaranteed capacity.
The Intermodulation Interference account form is following:
Intermodulation product calculates: [(Pf1-A1)+(Pf2-A2)+(Pf3-A3)+...]/C-K wherein, P: input power; A: the bandwidth conversion factor is between 0～1 constant; C: intermodulation exponent number; K: intermodulation inhibition degree.
Because intermodulation product mainly is descending high-power signal, up low-power level signal is impacted, the mode that therefore restrain of Intermodulation Interference is mainly adopted is: device has higher intermodulation inhibition degree; Adopt up-downgoing mode along separate routes to improve the isolation (link load that comprises space coupling isolation and up-downgoing) of downstream signal and upward signal.
In the present embodiment, POI equipment rack structure adopts 19 inches frames of standard, 2 meters of bracket heights, i.e. 2000mm (height) * 600mm (wide) * 600mm (deeply); Sub-frame is 19 inches subracks of standard, is of a size of: 400mm (length) * 355mm (height) * 460mm (deeply).Integral body is enclosed structure, and enclosure top is equipped with fan, has good capability of electromagnetic shielding and good cooling measure design.N type adapter is equipped with at the top of rack, and radio frequency cable is by the top access arrangement.Cable hole is arranged at the bottom of rack, supplies the turnover of all the other cables.In POI, synthesize, change in order to ensure high-power signal, the connection of various modules, we all use the half steel or the semi-flexible cable of diameter phi 3 on assembly technology.
In the present embodiment, each inserts the high buffer action of passing through access platform between the standard and the spatial separation scheme of dividing cable, makes that the phase mutual interference between each system reduces greatly; Antenna transmission system can be shared, avoided repeated construction, quickened networking speed, can share infrastructure such as machine room, antenna feeder between each operator, greatly reduces the cost of investment;
In Fig. 1; Descendingly be input as the radiofrequency signal that introduce the base station, comprise move GSM900, DCS1800, the GSM900 of UNICOM, DCS1800, WCDMA, telecommunications CDMA800, TETRA, airport communication TETRA, in the defend the country downstream signal of arteries and veins IDEN, DTV and mobile TV.The first order of input is an isolator, and it act as and prevents in down link, to occur impedance mismatching, through the reverse loss of isolator, with the most reflection power of attenuation, reaches the purpose of protection base station before the reflected signal feed-in base station.The second level is filter, and its effect is with signal of base station filtering, filtering interference signals, the third level be prime close the road with along separate routes, be two the tunnel with frequently closing the road if prime is closed the road, carry out two afterwards more along separate routes, then can adopt the 3dB electric bridge of 90 ° of phase differences to realize closing the road; If it is that two road alien frequencies close the road that prime is closed the road, carry out two afterwards more along separate routes, then can adopt close earlier the road more along separate routes mode realize.The fourth stage closes the road mode for back level, is that prime is closed two behind the road and closed the road again after along separate routes, and two mixers are arranged usually.T1 and the T2 two-way of signal through POI that closes behind the road outputs to the antenna emission.
In Fig. 2; Uply be input as antenna or leak the signal that cable is introduced from travelling carriage; In the opposite direction with downstream signal; Have GSM900, DCS1800, TD-SCDMA, the GSM900 of UNICOM, DCS1800, WCDMA, telecommunications CDMA800, TETRA, airport communication TETRA and in the arteries and veins IDEN that defends the country, input signal comprises the road of closing of 2G and following frequency range+WCDMA frequency range and TD-SCDMA (A+F) earlier through level mixer after the system.The up road of closing is consistent with descending principle, but side signal transmission is to descending opposite.
In Fig. 3 and Fig. 4, after descending casing and up box house are accomplished through the half steel cable connection,, on cabinet panel, connect with flanged (FLGD) two-way N-K joint in order to prevent hard connection, prevent to damage internal module.
Foregoing is merely the preferred embodiment of the utility model, is not the embodiment that is used to limit the utility model, and those skilled in the art are according to the design of the utility model, and appropriate adaptation of being made or modification all should be within the protection ranges of the utility model.
Claims (8)
1. one kind is used for the multi-system access platform of communicating by letter in the airport; Comprise downstream signal section and upward signal part; It is characterized in that: described downstream signal section comprises the downstream filter and the isolator of descending isolator, filter, prime filtering shunt, He Lu, two symmetrically arranged descending back level five frequency combiners, two above numbers; The number of described isolator is identical with the number of described downstream filter; Downstream filter and isolator connect one to one; Described descending prime filtering along separate routes, close the route power splitter and form with the 3dB electric bridge, any downstream filter all is connected to described descending prime filtering along separate routes, descending prime filtering is connected with described two descending back grade five frequency combiners along separate routes; Described upward signal partly comprises the upstream filter of up prime filtering shunt, He Lu, two symmetrically arranged up back level four frequency combiners and two above numbers; Described up prime filtering along separate routes, close the route power splitter and form with the 3dB electric bridge, any upstream filter all is connected to described up prime filtering along separate routes, up prime filtering is connected with described two up back grade four frequency combiners along separate routes.
2. the multi-system access platform that is used for airport communication as claimed in claim 1; It is characterized in that: be provided with a power splitter in the described downstream signal section; Be connected with a downstream filter on the described power splitter; This downstream filter is passed through to be connected with mobile TV signal output antenna behind the isolator, and power splitter is connected with described two descending back level five frequency combiners again.
3. the multi-system access platform that is used for airport communication as claimed in claim 1, it is characterized in that: be provided with a TD mixer in the described downstream signal section, described TD mixer is arranged on the rear end of downstream signal section.
4. the multi-system access platform that is used for airport communication as claimed in claim 1, it is characterized in that: described downstream signal section is arranged in the descending casing, and described upward signal partly is arranged in the up casing.
5. the multi-system access platform that is used for airport communication as claimed in claim 4, it is characterized in that: described descending casing and up casing are arranged in the rack.
6. the multi-system access platform that is used for airport communication as claimed in claim 4, it is characterized in that: described descending casing and up casing are provided with panel separately, are provided with cable joint in the described panel separately.
7. the multi-system access platform that is used for airport communication as claimed in claim 5 is characterized in that: the cable joint in the descending casing on the panel is connected with isolator through cable, and the cable joint in the up casing on the panel is connected with upstream filter through cable.
8. the multi-system access platform that is used for airport communication as claimed in claim 1 is characterized in that: be provided with a power splitter in the described upward signal part, be connected with a upstream filter on the described power splitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203987676U CN202269021U (en) | 2011-10-19 | 2011-10-19 | Multi-system access platform for airport communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203987676U CN202269021U (en) | 2011-10-19 | 2011-10-19 | Multi-system access platform for airport communication |
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| Publication Number | Publication Date |
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| CN202269021U true CN202269021U (en) | 2012-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011203987676U Expired - Fee Related CN202269021U (en) | 2011-10-19 | 2011-10-19 | Multi-system access platform for airport communication |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100691A (en) * | 2016-08-12 | 2016-11-09 | 浙江航洋通信科技有限公司 | A kind of multisystem emerging system receiving and dispatching separation |
| CN107070482A (en) * | 2017-02-09 | 2017-08-18 | 杭州柏乐尼通信设备有限公司 | The power amplification system of full operator full system type pictorial covering |
| CN109361044A (en) * | 2018-11-19 | 2019-02-19 | 中邮科通信技术股份有限公司 | Minimize cabinet multisystem mixing platform |
| CN111092635A (en) * | 2018-10-24 | 2020-05-01 | 中国电信股份有限公司 | Multi-system access platform and access method based on multi-system access platform |
-
2011
- 2011-10-19 CN CN2011203987676U patent/CN202269021U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106100691A (en) * | 2016-08-12 | 2016-11-09 | 浙江航洋通信科技有限公司 | A kind of multisystem emerging system receiving and dispatching separation |
| CN107070482A (en) * | 2017-02-09 | 2017-08-18 | 杭州柏乐尼通信设备有限公司 | The power amplification system of full operator full system type pictorial covering |
| CN111092635A (en) * | 2018-10-24 | 2020-05-01 | 中国电信股份有限公司 | Multi-system access platform and access method based on multi-system access platform |
| CN109361044A (en) * | 2018-11-19 | 2019-02-19 | 中邮科通信技术股份有限公司 | Minimize cabinet multisystem mixing platform |
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Granted publication date: 20120606 Termination date: 20171019 |