CN104602252B - A kind of design of digital fiber indoor distributed system that is while supporting four kinds of standards - Google Patents
A kind of design of digital fiber indoor distributed system that is while supporting four kinds of standards Download PDFInfo
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Abstract
The present invention provides digital fiber indoor distributed system that is a kind of while supporting four kinds of standards, and the optimization for mobile communication field signal covers.He includes sequentially connected access unit, expanding element, radio frequency unit.Access unit includes：2G duplexers/filter, 2G radio-frequency front-ends, 3G duplexers/filter, 3G radio-frequency front-ends, 4G duplexers/filter, 4G radio-frequency front-ends, local oscillator, RJ45 network interfaces, FPGAl, CPU mini systems, power supply module, 4 SFP main light ports.The expanding element includes：RJ45 network interfaces, FPGA2, CPU mini systems, power supply module, 1 SFP is from optical port, 7 SFP main light ports.The radio frequency unit includes：2G duplexers/filter, 2G power amplifiers/low noise, 2G radio-frequency front-ends, 3G duplexers/filter, 3G power amplifiers/low noise, 3G radio-frequency front-ends, 4G duplexers/filter, 4G power amplifiers/low noise, 4G radio-frequency front-ends, local oscillator, RJ45 network interfaces, FPGA3, CPU mini systems, power supply module, SFP is from optical port.The present invention can support all of mobile operator to be covered in the signal of operation standard simultaneously with set of system, reduce difficulty of construction, reduce the coordination with owner, while also supporting the channels WIFI.
Description
Technical field：
The present invention relates to a kind of novel four moulds intelligent digital optical fiber indoor distributed systems.The system is passed based on digital fiber
It is defeated, while supporting the second generation (GSM, DCS, CDMAlx), the third generation (WCDMA, CDMA-EVDO, TD-SCDMA), forth generation
(FDDLTE, TDLTE) mobile communication technology simultaneously provides 100 m ethernet channel for connection WIFI AP uses.
Industry background：
Mobile communication field has gone through the first generation (simulation), the second generation (GSM, CDMAlx), the third generation at present
(WCDMA, CDMA-EVDO, TD-SCDMA) is stepping into forth generation (FDDLTE, TDLTE).We use lG, 2G, 3G, 4G below
To state the first generation, the second generation, the third generation, fourth generation mobile communication technology.Wherein 1G has been eliminated, but 2G, 3G, 4G will
Meeting Long Coexistence, adds WIFI hot spot, 3 big mobile communication carriers actually need while the network of 4 kinds of standards of O＆M.
In some occasions, such as intensive building or large stadium etc., by outdoor macro base station it is difficult to have to interior
The signal of effect covers.At this moment it just needs to lay indoor distributed system.Existing indoor distributed system can be divided into two classes in the market,
One kind is using the modeling scheme of combiner, coupler, power splitter, and this scheme feeder line cost is too high, owner's difficult coordination, net
Interior interference is big.Another kind of is low-speed digital scheme, and this kind of scheme can only support 2G, 3G two since the technology of use is relatively outmoded
Kind standard.
Invention content：
The technical problem to be solved in the present invention is the provision of what a kind of four mould worked at the same time, supports 2G, 3G, 4G movement
The digital fiber indoor distributed system in the communication technology and the channels WIFI.It realizes and all industry of operator is supported with set of system
Business.Signal quality is improved simultaneously, reduces difficulty of construction.
The invention is realized in this way：
Four modulus word optical fiber indoor distributed systems of the invention include three kinds of units：Access unit, expanding element and radio frequency list
Member.The access unit is connected with expanding element, and expanding element can connect radio frequency unit, can also reconnect expanding element.
The access unit includes：2G duplexers/filter, 2G radio-frequency front-ends, 3G duplexers/filter, before 3G radio frequencies
End, 4G duplexers/filter, 4G radio-frequency front-ends, local oscillator, RJ45 network interfaces, FPGAl, CPU mini systems, power supply module, 4 SFP masters
Optical port.2G duplexers/the filter is connected to 2G radio-frequency front-ends, is connected to the FPGAl.3G duplexers/the filtering
Device is connected to 3G radio-frequency front-ends, is connected to FPGA1.4G duplexers/the filter is connected to 4G radio-frequency front-ends, is connected to
FPGAl.The RJ45 network interface connections are to FPGAl.The CPU mini systems are connected to FPGAl.4 SFP main light ports are all connected with
To FPGAl.The local oscillator provides local clock to each radio-frequency front-end and FPGAl.The power module is powered to each part mentioned above.
The expanding element includes：RJ45 network interfaces, FPGA2, CPU mini systems, power supply module, 1 SFP is from optical port, 7
SFP main light ports.The RJ45 network interface connections are to FPGA2.The CPU mini systems are connected to FPGA2.1 SFP from optical port and
7 SFP main light ports are all connected to FPGA2.The power module is powered to each part mentioned above.
The radio frequency unit includes：2G duplexers/filter, 2G power amplifiers/low noise, 2G radio-frequency front-ends, 3G duplexers/filter
Wave device, 3G power amplifiers/low noise, 3G radio-frequency front-ends, 4G duplexers/filter, 4G power amplifiers/low noise, 4G radio-frequency front-ends, local oscillator,
RJ45 network interfaces, FPGA3, CPU mini systems, power supply module, SFP is from optical port.2G duplexers/the filter be connected to 2G power amplifiers/
Low noise is connected to 2G radio-frequency front-ends, is connected to the FPGA3.3G duplexers/the filter be connected to 3G power amplifiers/
Low noise is connected to 3G radio-frequency front-ends, is connected to FPGA3.4G duplexers/the filter is connected to 4G power amplifiers/low noise
It puts, is connected to 4G radio-frequency front-ends, is connected to FPGA3.The RJ45 network interface connections are to FPGA3.The CPU mini systems connection
To FPGA3.The SFP is connected to FPGA3 from optical port.The local oscillator provides local clock to each radio-frequency front-end and FPGA3.It is described
Power module is powered to each part mentioned above.
Further, the access unit, expanding element, radio frequency unit networking in a star fashion, networking scale are very clever
It is living.Its minimal network structure is 1：0：1, that is to say, that expanding element can not be directly connected to radio frequency list by expanding element
Member.Maximum network structure is 1：32：196, that is, 1 access unit, 32 expanding elements, 196 radio frequency units.Access is single
Member can at most connect 4 expanding elements, and each expanding element can reconnect 7 expanding elements again, and then each extension is single
Member reconnects 7 radio frequency units.
The invention has the advantages that：
4, the channel 2G, 3G, 4G, WIFI standard of the present invention works at the same time.
The present invention can support all mobile communication standards by selecting different radio-frequency devices, including GSM, DCS,
The channel CDMAlx, WCDMA, CDMA-EVDO, TD-SCDMA, FDDLTE, TDLTE, WIFI.
Support double hairs are double to receive (double antenna MIMO) in the channels 4G of the present invention.
The channels WIFI of the present invention are the capacity of lOOMbps, and support 10/100Mbps self-adapted protocols.
The maximum length of access unit to the connection optical fiber between radio frequency unit of the present invention can be 3 kilometers.This length
Degree is the sum of the fiber lengths of a light-path between access unit, expanding element, radio frequency unit.
Description of the drawings：
Fig. 1 access unit module diagrams of the present invention
Fig. 2 expanding element module diagrams of the present invention
Fig. 3 radio frequency unit module schematic diagrames of the present invention
Fig. 4 present system structural schematic diagrams
Fig. 5 radio frequency unit connection diagrams of the present invention
Fig. 6 (GSM+TDS-CDMA+TDLTE+WIFI) access unit module diagrams of the invention
Fig. 7 (GSM+TDS-CDMA+TDLTE+WIFI) radio frequency unit module schematic diagrames of the invention
Specific implementation mode：
Illustrate specific implementation mode for being suitble to the room of China Mobile to divide product below.The product need support GSM,
The channel TDS-CDMA, TDLTE, WIFI.
In this embodiment, the access unit includes：GSM duplexers, GSM radio-frequency front-ends, TDS-CDMA filters
Wave device, TDS-CDMA radio-frequency front-ends, TDLTE filters, TDLTE radio-frequency front-ends, local oscillator, RJ45 network interfaces, the small system of FPGAl, CPU
System, power supply module, 4 SFP main light ports.The GSM duplexers are connected to GSM radio-frequency front-ends, are connected to the FPGA.It is described
TDS-CDMA filters are connected to TDS-CDMA radio-frequency front-ends, are connected to FPGAl.The TDLTE filters are connected to TDLTE
Radio-frequency front-end is connected to FPGAl.The RJ45 network interface connections are to FPGAl.The CPU mini systems are connected to FPGAl.Described 4
A SFP main light ports are all connected to FPGAl.The local oscillator provides local clock to each radio-frequency front-end and FPGAl.The power module
It powers to each part mentioned above.
The expanding element includes：RJ45 network interfaces, FPGA2, CPU mini systems, power supply module, 1 SFP is from optical port, 7
SFP main light ports.The RJ45 network interface connections are to FPGA2.The CPU mini systems are connected to FPGA2.1 SFP from optical port and
7 SFP main light ports are all connected to FPGA2.The power module is powered to each part mentioned above.
The radio frequency unit includes：Combiner, GSM duplexers, GSM power amplifiers/low noise, GSM radio-frequency front-ends, TDS-CDMA
Filter, TDS-CDMA radio-frequency front-ends, local oscillator, RJ45 network interfaces, FPGA3, CPU mini systems, power supply module, SFP is from optical port.It is described
GSM duplexers one end is connected to combiner, and one end is connected to GSM power amplifiers/low noise, is connected to GSM radio-frequency front-ends, reconnects
To the FPGA3.TDS-CDMA filters one end is connected to combiner, and one end is connected to TDS-CDMA power amplifiers/low noise,
TDS-CDMA radio-frequency front-ends are connected to, FPGA3 is connected to.One mouth of one end of the TDLTE filters is connected to conjunction
Road device, another mouth are connected to radio frequency mouth 2.2 mouths of the other end are all connected to TDLTE power amplifiers/low noise, are connected to
TDLTE radio-frequency front-ends, are connected to FPGA3.The RJ45 network interface connections are to FPGA3.The CPU mini systems are connected to FPGA3.
The SFP is connected to FPGA3 from optical port.The local oscillator provides local clock to each radio-frequency front-end and FPGA3.The power module
It powers to each part mentioned above.
The GSM radio frequencies mouth of the access unit is connected by coupler with the radio frequency mouth of GSM information sources base station.The access is single
The TDS-CDMA radio frequencies mouth of member is connected by coupler with the radio frequency mouth of TDS-CDMA information sources base station.The access unit
Two radio frequency mouths of TDLTE are connected each by coupler with two radio frequency mouths of TDLTE information sources base station.
The SFP of the expanding element is connected with the SFP main light ports of access unit by optical fiber from optical port.The expanding element
SFP can also be connected from optical port by optical fiber with the SFP main light ports of upper level expanding element.
The SFP of the radio frequency unit is connected with the SFP master of expanding element by optical fiber from optical port.The radio frequency unit
SFP can also be connected from optical port with the SFP main light ports of access unit.The radio frequency mouth 1 of the radio frequency unit and the width of dual polarized antenna
Port is connected by radio-frequency cable.The radio frequency mouth 2 of the radio frequency unit and the narrow band port of dual polarized antenna pass through radio frequency electrical
Cable connects.
Present system operation principle：
Downlink working principle：Access unit respectively by GSM radio frequencies mouth, TDS-CDMA radio frequencies mouth, TDLTE Double RFs mouth from
Information source base station obtains radiofrequency signal.GSM signals are by duplexer branch and filter, and then input GSM radio-frequency front-ends.GSM radio frequencies
Downstream mixer, AD (modulus) converter, digital filter are integrated in front end.The digital signal come out from GSM radio-frequency front-ends
Into FPGAl, become the code stream for meeting CPRI agreements after Digital Down Convert, linear filter.TDS-CDMA signals pass through filter
Wave device filters, and then inputs TDS-CDMA radio-frequency front-ends.Downstream mixer, AD conversion are integrated in TDS-CDMA radio-frequency front-ends
Device, digital filter.The digital signal come out from TDS-CDMA radio-frequency front-ends enters FPGAl, is filtered by Digital Down Convert, sideband
Become the code stream for meeting CPRI agreements after wave.The 2 road signals of TDLTE are by filters filter, before then inputting TDLTE radio frequencies
End.2 tunnel downstream mixers, 2 road AD converters, 2 railway digital filters are integrated in TDLTE radio-frequency front-ends.Before TDLTE radio frequencies
It brings out the digital signal come and enters FPGAl, become the code stream for meeting CPRI agreements after Digital Down Convert, linear filter.From
The Ethernet data that RJ45 network interfaces are come in also enters FPGAl after PHY chip, meets CPRI agreements by becoming after caching
Code stream.Above-mentioned GSM code streams, TDS-CDMA code streams, TDLTE code streams, WIFI channel bit streams respectively enter the CPRI moulds inside FPGAl
Block is packaged, and is then exported by SFP optical ports.
The SFP optical ports of access unit can connect expanding element, can also be directly connected to radio frequency unit.Expanding element is under
The effect of line direction is CPRI data distributions that SFP is inputted from optical port to each SFP main light ports.
Radio frequency unit using FPGA3 recovers GSM code streams, TDS- after receiving the data of the CPRI formats that SFP optical ports are come
CDMA code streams, TDLTE code streams, WIFI channel bit streams.GSM code streams are output to GSM radio frequencies after Digital Up Convert, linear filter
Front end.Digital filter, downstream mixer, DA (digital-to-analogue) converter are integrated in GSM radio-frequency front-ends.Go out from GSM radio-frequency front-ends
The analog signal come enters GSM power amplifier modules and carries out power amplification, is filtered and receives and dispatches combining subsequently into GSM duplexers,
Then it is output to combiner again.Before TDS-CDMA code streams are output to TDS-CDMA radio frequencies after Digital Up Convert, linear filter
End.Digital filter, downstream mixer, D/A converter are integrated in TDS-CDMA radio-frequency front-ends.From TDS-CDMA radio-frequency front-ends
Analog signal out enters TDS-CDMA power amplifier modules and carries out power amplification, subsequently into TDS-CDMA filters filters, so
It is output to combiner again afterwards.TDLTE code streams are output to TDLTE radio-frequency front-ends after Digital Up Convert, linear filter.TDLTE
2 railway digital filters, 2 tunnel downstream mixers, 2 tunnel D/A converters are integrated in radio-frequency front-end.It is come out from TDLTE radio-frequency front-ends
2 tunnel analog signals enter two-way TDLTE power amplifier modules and carry out power amplification, subsequently into two-way TDLTE filters filters, then
Wherein it is output to combiner again all the way.The broadband ports of dual polarized antenna are output to after into 3 road signal combinings of combiner.It is double
The other output signal all the way of road TDLTE filters need not enter combiner, be directly connected to another of dual polarized antenna
Radio frequency mouth-narrow band port.WIFI code streams are sent into PHY chip, are exported from the ports RJ45 after becoming ethernet signal, connect WIFI's
AP (access point).
Uplink operation principle：Radio frequency unit receives the broadband upstream signal that dual polarized antenna is sent by radio frequency mouth 1 respectively,
This signal is divided into GSM, TDS-CDMA, TDLTE uplink signal after combiner.The signal that radio frequency unit mouth 2 is come in is not required to
To pass through combiner, be directly entered TDLTE filters.Above-mentioned GSM signals are by duplexer branch and filter, and then input GSM
Low noise enters back into GSM radio-frequency front-ends.Upstream mixer, AD (modulus) converter, number filter are integrated in GSM radio-frequency front-ends
Wave device.The digital signal come out from GSM radio-frequency front-ends enters FPGA3, becomes to meet after Digital Down Convert, linear filter
The code stream of CPRI agreements.Then TDS-CDMA signals input TDS-CDMA low noise, enter back into TDS- by filters filter
CDMA radio-frequency front-ends.Upstream mixer, AD converter, digital filter are integrated in TDS-CDMA radio-frequency front-ends.From TDS-
The digital signal that CDMA radio-frequency front-ends come out enters FPGA3, becomes to meet CPRI agreements after Digital Down Convert, linear filter
Code stream.Then the 2 road signals of TDLTE input TDLTE low noise, enter back into TDLTE radio-frequency front-ends by filters filter.
2 tunnel upstream mixers, 2 road AD converters, 2 railway digital filters are integrated in TDLTE radio-frequency front-ends.From TDLTE radio-frequency front-ends
Digital signal out enters FPGA3, becomes the code stream for meeting CPRI agreements after Digital Down Convert, linear filter.RJ45
The AP (access point) of network interface connection WIFI, the Ethernet data come in from this mouthful also enter FPGA3 after PHY chip, pass through
Become the code stream for meeting CPRI agreements after caching.Above-mentioned GSM code streams, TDS-CDMA code streams, TDLTE code streams, WIFI channel bit streams
It respectively enters the CPRI modules inside FPGA3 to be packaged, then be exported by SFP optical ports.
The SFP optical ports of radio frequency unit can connect expanding element, can also be directly connected to access unit.Expanding element is upper
The effect of line direction is different with Ethernet CPRI data to radio frequency CPRI data.For radio frequency CPRI data, expanding element pair
Data from each radio frequency unit are adjusted into line amplitude, are then carried out vector addition, are merged into CPRI data all the way, are sent to
Upper level expanding element or access unit.For Ethernet CPRI data, expanding element is an interchanger, from from
The data of each radio frequency unit, upper level expanding element or access unit carry out layer two and exchange.
Access unit using FPGAI recovers GSM code streams, TDS- after receiving the data of the CPRI formats that SFP optical ports are come
CDMA code streams, TDLTE code streams, WIFI channel bit streams.GSM code streams are output to GSM radio frequencies after Digital Up Convert, linear filter
Front end.Digital filter, upstream mixer, DA (digital-to-analogue) converter are integrated in GSM radio-frequency front-ends.Go out from GSM radio-frequency front-ends
The analog signal come enters GSM duplexers and is filtered and receives and dispatches combining, is then output to the ports GSM.TDS-CDMA code streams pass through
It is output to TDS-CDMA radio-frequency front-ends after crossing Digital Up Convert, linear filter.Digital filter is integrated in TDS-CDMA radio-frequency front-ends
Wave device, upstream mixer, D/A converter.The analog signal come out from TDS-CDMA radio-frequency front-ends enters TDS-CDMA filter mistakes
Filter, is then output to the ports TDS-CDMA.Before TDLTE code streams are output to TDLTE radio frequencies after Digital Up Convert, linear filter
End.2 railway digital filters, 2 tunnel upstream mixers, 2 tunnel D/A converters are integrated in TDLTE radio-frequency front-ends.Before TDLTE radio frequencies
It brings out the 2 tunnel analog signals come and enters two-way TDLTE filters filters, be then output to 2 ports TDLTE.WIFI code streams are sent
Enter PHY chip, is exported from the ports RJ45 after becoming ethernet signal.
Embodiment of above is only an example of the present invention, therefore cannot limit the practical range of the present invention according to this,
The equivalent changes and modifications done according to present specification should all be still fallen in the range of the present invention covers.
Claims (2)
1. a kind of four mould intelligent digital optical fiber indoor distributed systems；It is characterized in that 4, the channel 2G, 3G, 4G, WIFI standard is same
When work；And support double hairs of 4G are double to receive (MIMO)；System is made of access unit, expanding element, radio frequency unit；It is described
Access unit is connected with expanding element, can be also directly connected to radio frequency unit；The expanding element is connected with radio frequency unit, also may be used
It is connected with next stage expanding element；Above-mentioned all connections all use optical fiber；
The access unit includes：2G duplexers/filter, 2G radio-frequency front-ends, 3G duplexers/filter, 3G radio-frequency front-ends, 4G
Duplexer/filter, 4G radio-frequency front-ends, local oscillator, RJ45 network interfaces, FPGAl, CPU mini systems, power supply module, 4 SFP main light ports；
2G duplexers/the filter is connected to 2G radio-frequency front-ends, is connected to the FPGA1；The 3G duplexers/filter connection
To 3G radio-frequency front-ends, it is connected to FPGA1；4G duplexers/the filter is connected to 4G radio-frequency front-ends, is connected to FPGAl；
The RJ45 network interface connections are to FPGAl；The CPU mini systems are connected to FPGAl；4 SFP main light ports are all connected to
FPGAl；The local oscillator provides local clock to each radio-frequency front-end and FPGAl；The power supply module is powered to each part mentioned above；Institute
It states access unit and radio frequency letter is obtained from information source base station by GSM radio frequencies mouth, TDS-CDMA radio frequencies mouth, TDLTE Double RFs mouth respectively
Number, obtain Ethernet data from RJ45 network interfaces；
The expanding element includes：RJ45 network interfaces, FPGA2, CPU mini systems, power supply module, 1 SFP is from optical port, 7 SFP masters
Optical port；The RJ45 network interface connections are to FPGA2；The CPU mini systems are connected to FPGA2；1 SFP is from optical port and 7
SFP main light ports are all connected to FPGA2；The power supply module is powered to each part mentioned above；
The radio frequency unit includes：2G duplexers/filter, 2G power amplifiers/low noise, 2G radio-frequency front-ends, 3G duplexers/filtering
Device, 3G power amplifiers/low noise, 3G radio-frequency front-ends, 4G duplexers/filter, 4G power amplifiers/low noise, 4G radio-frequency front-ends, local oscillator,
RJ45 network interfaces, FPGA3, CPU mini systems, power supply module, SFP is from optical port；2G duplexers/the filter be connected to 2G power amplifiers/
Low noise is connected to 2G radio-frequency front-ends, is connected to the FPGA3；3G duplexers/the filter be connected to 3G power amplifiers/
Low noise is connected to 3G radio-frequency front-ends, is connected to FPGA3；4G duplexers/the filter is connected to 4G power amplifiers/low noise
It puts, is connected to 4G radio-frequency front-ends, is connected to FPGA3；The RJ45 network interface connections are to FPGA3；The CPU mini systems connection
To FPGA3；The SFP is connected to FPGA3 from optical port；The local oscillator provides local clock to each radio-frequency front-end and FPGA3；It is described
Power supply module is powered to each part mentioned above；
Downlink working principle：Access unit is respectively by GSM radio frequencies mouth, TDS-CDMA radio frequencies mouth, TDLTE Double RFs mouth from information source
Base station obtains radiofrequency signal；GSM signals are by duplexer branch and filter, and then input GSM radio-frequency front-ends；GSM radio-frequency front-ends
Inside it is integrated with downstream mixer, AD (modulus) converter, digital filter；The digital signal come out from GSM radio-frequency front-ends enters
FPGAl becomes the code stream for meeting CPRI agreements after Digital Down Convert, linear filter；TDS-CDMA signals pass through filter
Then filtering inputs TDS-CDMA radio-frequency front-ends；Downstream mixer, AD converter, number are integrated in TDS-CDMA radio-frequency front-ends
Word filter；The digital signal come out from TDS-CDMA radio-frequency front-ends enters FPGAl, after Digital Down Convert, linear filter
Become the code stream for meeting CPRI agreements；Then the 2 road signals of TDLTE input TDLTE radio-frequency front-ends by filters filter；
2 tunnel downstream mixers, 2 road AD converters, 2 railway digital filters are integrated in TDLTE radio-frequency front-ends；From TDLTE radio-frequency front-ends
Digital signal out enters FPGAl, becomes the code stream for meeting CPRI agreements after Digital Down Convert, linear filter；From
The Ethernet data that RJ45 network interfaces are come in also enters FPGAl after PHY chip, meets CPRI agreements by becoming after caching
Code stream；Above-mentioned GSM code streams, TDS-CDMA code streams, TDLTE code streams, WIFI channel bit streams respectively enter the CPRI moulds inside FPGAl
Block is packaged, and is then exported by SFP main light ports；
Uplink operation principle：Radio frequency unit receives the broadband upstream signal that dual polarized antenna is sent by radio frequency mouth 1 respectively, this
Signal is divided into GSM, TDS-CDMA, TDLTE uplink signal after combiner；The signal that radio frequency unit mouth 2 is come in need not be through
Combiner is crossed, TDLTE filters are directly entered；Above-mentioned GSM signals are by duplexer branch and filter, and then input GSM low noises
It puts, enters back into GSM radio-frequency front-ends；Upstream mixer, AD (modulus) converter, digital filter are integrated in GSM radio-frequency front-ends；
The digital signal come out from GSM radio-frequency front-ends enters FPGA3, becomes to meet CPRI associations after Digital Down Convert, linear filter
The code stream of view；Then TDS-CDMA signals input TDS-CDMA low noise, enter back into TDS-CDMA radio frequencies by filters filter
Front end；Upstream mixer, AD converter, digital filter are integrated in TDS-CDMA radio-frequency front-ends；Before TDS-CDMA radio frequencies
It brings out the digital signal come and enters FPGA3, become the code stream for meeting CPRI agreements after Digital Down Convert, linear filter；
Then the 2 road signals of TDLTE input TDLTE low noise, enter back into TDLTE radio-frequency front-ends by filters filter；TDLTE is penetrated
2 tunnel upstream mixers, 2 road AD converters, 2 railway digital filters are integrated in frequency front end；The number come out from TDLTE radio-frequency front-ends
Word signal enters FPGA3, becomes the code stream for meeting CPRI agreements after Digital Down Convert, linear filter；RJ45 network interface connections
The AP (access point) of WIFI, the Ethernet data come in from this mouthful also enters FPGA3 after PHY chip, by becoming after caching
At the code stream for meeting CPRI agreements；Above-mentioned GSM code streams, TDS-CDMA code streams, TDLTE code streams, WIFI channel bit streams respectively enter
CPRI modules inside FPGA3 are packaged, and are then exported from optical port by SFP.
2. a kind of four moulds intelligent digital optical fiber indoor distributed system according to claim 1, it is characterised in that the access
Unit, expanding element, radio frequency unit, which can form Star Network, can at most support 1：32：196.
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| CN201310530370.1A CN104602252B (en) | 2013-11-01 | 2013-11-01 | A kind of design of digital fiber indoor distributed system that is while supporting four kinds of standards |
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| CN201310530370.1A CN104602252B (en) | 2013-11-01 | 2013-11-01 | A kind of design of digital fiber indoor distributed system that is while supporting four kinds of standards |
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| CN104602252B true CN104602252B (en) | 2018-09-28 |
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| CN105680950B (en) * | 2016-01-27 | 2018-12-18 | 南京典格通信科技有限公司 | A kind of five moulds, seven ten channel intelligent digital optical fiber indoor distributed systems of frequency |
| CN112511185A (en) * | 2020-12-21 | 2021-03-16 | 深圳市爱普赛尔信息技术有限公司 | 2G, 3G and 4G integrated double-carrier portable detection equipment |
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| CN202841549U (en) * | 2012-09-18 | 2013-03-27 | 京信通信系统（中国）有限公司 | Communication equipment supporting multiple services and active antenna terminal system |
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| CN102231885A (en) * | 2011-06-13 | 2011-11-02 | 福建三元达通讯股份有限公司 | Multifunctional micro-power indoor distributed system |
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