CN105406925B - Multi-frequency-band digital optical fiber distributed type antenna system - Google Patents

Multi-frequency-band digital optical fiber distributed type antenna system Download PDF

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CN105406925B
CN105406925B CN201510684246.XA CN201510684246A CN105406925B CN 105406925 B CN105406925 B CN 105406925B CN 201510684246 A CN201510684246 A CN 201510684246A CN 105406925 B CN105406925 B CN 105406925B
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frequency
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distal end
intermediate frequency
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CN105406925A (en
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介利军
孙顺华
陈志聪
关淇
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GUANGZHOU EYECOM TELECOMMUNICATIONS CO Ltd
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GUANGZHOU EYECOM TELECOMMUNICATIONS CO Ltd
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Abstract

The invention discloses a kind of multi-frequency-band digital optical fiber distributed type antenna system, near-end machine and remote termination including being connected with each other communication.Multi-frequency-band digital optical fiber distributed type antenna system of the present invention, which has taken the prior art and cannot facilitate, to be supported MIMO, not to possess proximal spread function, the shortcomings such as incompatible kilomega network data penetration transmission, radio frequency and if system can not separate, and improves effective application range of system.Meet multiband in existing communication network, multi-standard, the application demand of big bandwidth, realize that the construction of Joint construction and sharing is expected.Therefore system proposed by the invention is in the application of the network coverage, it will has boundless application prospect.

Description

Multi-frequency-band digital optical fiber distributed type antenna system
Technical field
The present invention relates to mobile communication system, more specifically to a kind of multi-frequency-band digital optical fiber distributed type aerial system System.
Background technology
The fast development of mobile communication has driven the explosive growth of mobile Internet and high broadband data service, and then Also deepening continuously for network construction has been promoted.Although operator can be continuously increased frequency point and cell site or introduce new lead to Letter standard tackles surging for data business volume, but thus causes that frequency spectrum resource is more and more compacter, communication standard is more and more various Change, great challenge is brought to the traditional network coverage and optimization.
Repeater is being used to drag when zooming out covering of N as indoor and outdoor 1, if using existing one-segment optical fiber repeater Equipment is would have in the coverage cell of multiband, multi-standard using multiple devices, and cost increase, installation complexity is caused to carry It is high.If covered using distributed base station Constructing ideas, it can only support single-frequency since RRU is substantially all, can not also meet The needs of multifrequency, multi-standard, therefore this kind of network coverage can not still overcome the above problem.In addition, if using distributed base station It carries out zooming out covering, since the information source that covering public domain uses may not be same main equipment producer, will cause BBU can not It uses, and then influences the implementation of whole covering scheme.Therefore, it is unfavorable using traditional single frequency fiber repeater or RRU schemes With the improvement of operator CAPEX (equipment investment) and OPEX (operation cost), the purpose of Joint construction and sharing can not be also realized.
The content of the invention
It is an object of the invention to:A kind of multi-frequency-band digital optical fiber distributed type antenna system is provided, overcomes the prior art Signal access and cover the shortcomings that weak, improve the effective coverage range of network.
To achieve these goals, the present invention provides multi-frequency-band digital optical fiber distributed type antenna system, including mutually interconnecting The near-end machine and remote termination of letter are connected, the near-end machine includes dual-mode antenna, coupler, near-end converter unit, near-end backboard list Member, near-end digital intermediate frequency unit, near-end power supply unit and near-end main control unit;The dual-mode antenna is for proximal void signal Wireless access, the coupler are used to couple the radiofrequency signal of base station;The near-end converter unit is used in the downlink will Radiofrequency signal is changed into intermediate-freuqncy signal, then provides local oscillator in the uplink to the near-end digital intermediate frequency unit, makes it by Frequency signal is mixed to radio frequency;The near-end backboard unit is for the near-end converter unit and the near-end digital intermediate frequency unit Interconnection, the switching of power supply;The near-end digital intermediate frequency unit includes near-end analog to digital conversion circuit, near-end D/A converting circuit, near End group tape handling unit, near-end common public radio interface unit, near-end optical transceiver group, the near-end analog to digital conversion circuit are used Intermediate frequency filtering and digital-to-analogue conversion in access corresponding band, the near-end D/A converting circuit are used for the digital-to-analogue conversion of corresponding band And its intermediate frequency filtering after output, the near-end baseband processing unit are used for the Base-Band Processing of signal, the near-end is general public Radio interface unit in the downlink carry out data compression, framing and unzip it in the uplink, frame decoding, The transmission of monitoring information and mesh information, the near-end optical transceiver group for convert photosignal and with the remote termination into Row signal interaction;The near-end main control unit is handed over by the backboard unit and the near-end digital intermediate frequency unit into row information Mutually, and to the near-end power supply unit it is monitored and switches;The remote termination includes remote digital intermediate frequency unit, distal end backboard Unit, distal end converter unit, multiplexing combiner unit and main control unit;The remote digital intermediate frequency unit is received and dispatched including distal end light Device group, distal end common public radio interface unit (CPRI), distal end baseband processing unit, distal end analog to digital conversion circuit, distal end are anti- Present analog to digital conversion circuit, distal end D/A converting circuit, the distal end optical transceiver group for convert photosignal and with it is described Near-end machine carries out signal interaction, and the distal end common public radio interface unit carries out data decompression, solution in the downlink Frame and the transmission for carrying out data compression, framing, monitoring information and mesh information in the uplink, the distal end analog-to-digital conversion Circuit is used for the intermediate frequency filtering and analog-to-digital conversion of multi-upstream access frequency range, and the far-end feedback analog to digital conversion circuit couples for downlink The digital pre-distortion of corresponding band, the distal end digital-to-analogue conversion are completed in intermediate frequency filtering, analog-to-digital conversion and the cooperation of power amplifier signal Circuit is for the intermediate frequency filtering after the digital-to-analogue conversion and its output of corresponding band;The distal end backboard unit is used for the distal end number Interconnection, the switching of power supply of word intermediate frequency unit and the distal end converter unit;The distal end converter unit is in uplink and instead Road is fed back to for radiofrequency signal to be changed into intermediate-freuqncy signal, downlink then provides local oscillator to the remote digital intermediate frequency unit, makes it Intermediate-freuqncy signal is mixed to radio frequency;The multiplexing combiner unit is used to filter uplink and downlink signals;The distal end main control unit For into the interaction and control of row information.
As a modification of the present invention, the near-end machine includes main near-end machine and proximally machine, and the proximally machine is used In receiving remote base station data, the near-end optical transceiver group of the main near-end machine includes main near-end optical transceiver group and near Optical transceiver group is held, the main near-end optical transceiver group is used to carry out signal interaction with the remote termination, and the proximally light is received Device group is sent out to be used to carry out signal interaction with the proximally machine.
As a modification of the present invention, in the near-end machine, the near-end converter unit and near-end digital intermediate frequency list Member is separately positioned, and the near-end converter unit is connected with the near-end backboard unit hot plug;It is described remote in the remote termination Hold converter unit and remote digital intermediate frequency unit separately positioned,;It is controlled by the quantity of near-end converter unit described in hot plug Access the frequency range number of near-end;Then control access distal end common numbers plate is realized by increasing or reducing T/R quantity in distal end Band number.
As a modification of the present invention, the near-end power supply unit of the near-end machine includes two power modules, normal work When making, two power module parallel connections, by the way of flowing, when one of abnormity of power supply, another power supply independence work Make.
As a modification of the present invention, if system uses multi-input multi-output system (MIMO), needing will be how defeated The data for entering multiple output system (MIMO) frequency range are separated, and will utilize multiplexing combiner unit R 1 and multiplexing combiner unit R 2 Individually carry out the transmitting respectively of data;Discounting for MIMO, then all frequency ranges are exported by same multiband combiner R1 It is covered to antenna.
As a modification of the present invention, the near-end machine further includes one and the near-end common public radio interface unit The near-end kilomega network processing unit of connection, the remote termination further include one and are connected with the distal end common public radio interface unit Distal end kilomega network processing unit.
Compared with prior art, multi-frequency-band digital optical fiber distributed type antenna system of the present invention has taken the prior art and cannot facilitate Support MIMO, do not possess proximal spread function, that incompatible kilomega network data penetration transmission, radio frequency and if system can not separate etc. is many Shortcoming improves effective application range of system.Meet multiband in existing communication network, multi-standard, the application need of big bandwidth It asks, realizes that the construction of Joint construction and sharing is expected.Therefore system proposed by the invention is in the application of the network coverage, it will has very Wide application prospect.
Description of the drawings
With reference to the accompanying drawings and detailed description, the structure to the present invention and its advantageous effects carry out specifically It is bright.
Fig. 1 is the networking schematic diagram of multi-frequency-band digital optical fiber distributed type antenna system of the present invention.
Fig. 2 is the near-end machine schematic block circuit diagram of multi-frequency-band digital optical fiber distributed type antenna system of the present invention.
Fig. 3 is the remote termination schematic block circuit diagram of multi-frequency-band digital optical fiber distributed type antenna system of the present invention.
Specific embodiment
In order to which the goal of the invention, technical solution and its advantageous effects that make the present invention become apparent from, below in conjunction with attached drawing And specific embodiment, the present invention will be described in further detail.It should be appreciated that the specific reality described in this specification Mode is applied just for the sake of explaining the present invention, is not intended to limit the present invention.
It please refers to Fig.1, Fig. 2 and Fig. 3, multi-frequency-band digital optical fiber distributed type antenna system of the present invention include being connected with each other communication Near-end machine and remote termination, in near-end machine and remote termination include following component:
Dual-mode antenna AML:The wireless access of proximal void signal is completed, wherein:A id signals access way is antenna, M Near-end, L values are identified as natural number, identifies the L frequency ranges of wireless receiving;
Coupler MN:For coupling the radiofrequency signal of base station, wherein:N value natural numbers, the n-th of mark coupling access Frequency range;
T/R MN:Downlink is used to radiofrequency signal being changed into intermediate-freuqncy signal, and uplink then provides local oscillator to near-end digiboard DSPU units, make it that intermediate-freuqncy signal is mixed to radio frequency.The present invention is passed through using radio frequency T/R and digital intermediate frequency plate independent design Backboard interconnects, and the T/R unit hot plugs of each frequency range are made by blind plugging function, can freely control the frequency range of access public number plate Number;
Backboard M1:The backboard of near-end, for completing the interconnection of near-end T/R units and digiboard DSPU, power supply is transferred, closely Hold monitoring information forwarding of DSPU units etc.;
A/D MN:The A/D conversion circuits of near-end N frequency ranges, for completing the intermediate frequency filtering of access frequency range and digital-to-analogue conversion;
D/A MN:The D/A conversion circuits of near-end N frequency ranges, after completing the digital-to-analogue conversion of the frequency range and its output Intermediate frequency filtering;
Base-Band Processing M1:Near-end baseband processing unit, the main Base-Band Processing for completing signal, comprising:Zero intermediate frequency conversion, number The functions such as word filtering, gain control, power detection, Power Control, the control of TD-LTE uplink and downlinks switch, the control of GSM time slot switch;
CPRI M1:The process part of the defeated agreements of near-end CPRI, mainly completes data compression, framing in downlink, and downlink is completed Decompression, the operation of frame decoding and monitoring information, the transmission of mesh information;
Optical transceiver group M1:The slave optical port of near-end, completes the conversion of electro-optical signal, is mainly used for completing and extension D-OMU Signal interaction;
Optical transceiver group M2:The main light port of near-end completes the conversion of electro-optical signal, is mainly used for completing and distal end D-ORU Signal interaction;
Power ps U1 and power ps U2:Two power modules, two power sources in parallel during normal work, using the side flowed Formula;When one of module exception, in addition a modular power source works independently, it is ensured that system normal operation, strengthening system are reliable Property;
Near-end monitoring MCU M1:Near-end main control unit completes the information exchange with near-end DSPU by backboard, reaches monitoring The purpose of whole network information, and the power work state of near-end is monitored and switched;
Optical transceiver group R1:Distal end optical port completes the conversion of electro-optical signal, main to complete to hand over the information of near-end main light port The mutual and information exchange with distal end next stage cascade module;
CPRI R1:The process part of the defeated agreements of distal end CPRI, mainly completes data decompression, frame decoding in downlink, and uplink is complete Into compression, the operation of framing and monitoring information, the transmission of mesh information;
Base-Band Processing R1:The base band data processing unit of distal end, mainly comprising gain control, Power Control, power amplifier protection, CFR (peak-to-average force ratio reduction), DPD (digital pre-distortion), TD-LTE uplink and downlink timeslots are synchronous, GSM slot synchronizations are handled, telephone traffic system Meter etc.
Remote monitoring MCU R1:Realize the information exchange to each peripheral hardware in distal end, control, digit chip configuration etc.;
Backboard R1:The backboard of distal end, for completing the monitoring interconnection of distal end T/R units and remote digital plate DSPU, power supply Switching etc.;
A/D RN_0:The distally A/D conversion circuits of N frequency ranges, for completing the intermediate frequency filtering of multi-upstream access frequency range and mould Number conversion;
A/D RN_1:The distally feedback A/D conversion circuits of N frequency ranges, for completing the intermediate frequency of downlink coupling power amplifier signal Filtering and analog-to-digital conversion are mainly used for the digital pre-distortion that N frequency ranges are completed in cooperation;
D/A RN:The distally D/A conversion circuits of N frequency ranges, after completing the digital-to-analogue conversion of the frequency range and its output Intermediate frequency filtering;
T/R RN:The distally T/R of N frequency ranges is used to radiofrequency signal being changed into intermediate-freuqncy signal in uplink and backfeed loop, Downlink then provides local oscillator to remote digital plate DSPU units, makes it that intermediate-freuqncy signal is mixed to radio frequency.This grade of T/R and digital intermediate frequency Plate independent design can realize the number of frequency bands of control access distal end common numbers plate by increasing or reducing distal end T/R;
Multiplexing combiner unit R:For being filtered to distal end uplink and downlink signals, possesses multiband combining function;If consider The application of MIMO needs to separate MIMO frequency ranges herein, and two channel separations are closed in multiplexing combiner unit R 1 and multiplexing Road device unit R 2 individually emits, and Typical Disposition is the MIMO of 2*2 at present;Discounting for MIMO, then can by all frequency ranges by Same multiband combiner R1, which is exported to antenna, to be covered.
The work step of multi-frequency-band digital optical fiber distributed type antenna system of the present invention includes following several major:
1st, the downlink working step of main D-OMU signals coupled signal:
Step 1-1:Coupler N couples the N frequency range radiofrequency signals of Base Transmitter, and wherein N is band number, take 1,2,3, 4…;Typical Disposition of the present invention is 4, maximum configured 8, but is not limited only to 8 frequencies, can support system extension upgrading;
Step:1-2:The N frequency ranges radiofrequency signal of step 1-1 couplings passes through the Frequency mixing processing of T/R MN, generates intermediate frequency letter Number, the IF frequency designed in the present invention is unified for 204.32MHz, which can need to be adjusted according to system, wherein M Near-end mark is identified, N is the N frequency range labels described in step 1-1;
Step 1-3:The intermediate-freuqncy signal that A/D MN link pair T/R MN are generated carries out intermediate frequency filtering, then by A/D chips pair Intermediate frequency data is sampled, and realizes digital-to-analogue conversion, and sample rate uses 245.76MSPS herein;
Step 1-4:Near-end baseband processing unit M1 carries out the digital medium-frequency signal of all frequency ranges Base-Band Processing, main complete Into function:Zero intermediate frequency conversion, signal filtering, gain control, power statistic, Power Control etc.;
Step 1-5:CPRI M1 units carry out the functions such as data compression, framing to each frequency band digital of step 1-4, will The base band data that data are transmitted according to CPRI protocol conversions into suitable optical fiber, optical module rate of the present invention use 10G, can basis System application is adjusted to 6.25G or higher data rate;
Step 1-6:To handling the data of completion in step 1-5, optical transceiver group M2 transmits it to distal end by optical fiber D-ORU;
Step 1-7:Distal end optical transceiver group R1 receives the optical signal that near-end transmits, and is carried out opto-electronic conversion;
Step 1-8:CPRI R1 modules receive the CPRI data from step 1-7, and frame decoding, data decompression are carried out to it Power and energies are waited, wherein R is distal marker;
Step 1-9:Base-Band Processing R1 carries out frequency-division section processing to all frequency range data of CRPI R1 decomposition modules, comprising: Gain control, Power Control, power amplifier protection, CFR (peak-to-average force ratio reduction), DPD (digital pre-distortion), TD-LTE uplink and downlink timeslots are same Step, the processing of GSM slot synchronizations etc.;
Step 1-10:Through step 1-9 treated data, by D/A RN link pairs, it carries out digital-to-analogue conversion, and carries out Intermediate frequency filtering is realized conversion of the signal by base band to intermediate frequency, and is mixed with local oscillator, realizes that intermediate frequency turns to radiofrequency signal It changes;
Step 1-11:T/R RN units include the power amplifier of N frequency ranges, therefore the step is mainly completed to penetrate N frequency range downlinks The amplification of frequency signal;
Step 1-12:Multiplexing combiner unit, which receives, passes through amplified N frequency range radiofrequency signals, after being filtered to it It is radiated through antenna, since system will be compatible with MIMO therefore reserves the passage of 1 output, if without using MIMO, all frequency ranges It can be via the 1 progress multifrequency combining output of multiplexing combiner unit R.
2nd, the downlink working step of D-OMU coupled signals is extended:
Extend the work step 1-1 to 1- of the downlink working step 2-1 to step 2-5 and main D-OMU of D-OMU coupled signals 5 is identical, and details are not described herein again;
Step 2-6:To handling the data of completion in step 2-5, extend the optical transceiver group M2 of D-OMU by optical fiber by its It is transmitted to the optical transceiver group M1 of main D-OMU;
Step 2-7:The optical transceiver group M1 of main D-OMU completes opto-electronic conversion after receiving signal, sends data to CPRI M1 modules will need the frequency range data transmitted to pass to optical transceiver group after carrying out data compression, framing by the module M2;
Subsequent step 2-8 to 2-14 is identical with the work step 1-6 to 1-12 of main D-OMU, and details are not described herein again.
3rd, kilomega network (WLAN) data mainly realize transparent transmission function, and system is not handled it, downlink working step It is as follows:
Step 3-1:Main D-OMU receives the WLAN network data of base station by RJ45;
Step 3-2:Kilomega network processing unit M1 parses gigabit network data, completes data extraction;
Step 3-3:CPRI M1 modules carry out framing to the gigabit network data extracted;
Step 3-4:Gigabit network data after the completion of framing is sent to distal end by the optical port of optical transceiver group M2 via optical fiber D-ORU;
Step 3-5:After distal end D-ORU receives fiber data by optical transceiver group R1, by distal end CPRI R1 to thousand Million network datas complete parsing;
Step 3-6:Kilomega network processing unit R1 is forwarded to data, most carries out distal end covering through RJ45 afterwards.
4th, when the main D-OMU of near-end carries out the covering of near-end wireless signal transmission by dual-mode antenna, downlink working step is such as Under:
The signal working method of the part is identical with the working method of main D-OMU coupling base station signals, and difference is closely The access way of end signal.If using this kind of cloth net mode, only need near-end that signal is accessed signal i.e. by dual-mode antenna AML Can, wherein a-signal is accessed in a manner of antenna, and M mark near-ends, L values identify l-th frequency range for natural number.
5th, uplink is the inverse process of downlink data flow, the uplink work step of main D-OMU signals coupled signal:
Step 5-1:Remote antenna receives N frequency range radiofrequency signals;
Step 5-2:Multiplexing combiner unit is filtered the N frequency range radiofrequency signals that step 4-1 is received device processing;
Step 5-3:The N frequency ranges radiofrequency signal that step 5-2 is received passes through the Frequency mixing processing of T/R RN, generates intermediate frequency letter Number, the IF frequency designed in the present invention is unified for 204.32MHz, which can need to be adjusted according to system;
Step 5-4:The intermediate-freuqncy signal that A/D RN_0 link pair T/R RN are generated carries out intermediate frequency filtering, then by A/D chips Intermediate frequency data is sampled, realizes digital-to-analogue conversion, sample rate uses 245.76MSPS herein;The A/D RN_1 of distal end are mainly adopted The power amplifier for coupling the frequency range output signal that sample T/R RN_1 are returned, auxiliary realize the digital predistortion function of the frequency range;
Step 5-5:Distal end baseband processing unit R1 carries out digital base band processor to the digital medium-frequency signal of all frequency ranges, main Complete function:Zero intermediate frequency conversion, signal filtering, gain control, power statistic, Power Control, TD-LTE uplink and downlink timeslot controls System, GSM sequence controls, traffic statistic etc.;
Step 5-6:CPRI R1 units carry out the functions such as data compression, framing to each frequency band digital of step 5-5, will The base band data that data are transmitted according to CPRI protocol conversions into suitable optical fiber;
Step 5-7:To handling the data of completion in step 5-6, distal end optical transceiver group R1 is transmitted it to by optical fiber Near-end D-OMU;
Step 5-8:Near-end optical transceiver group M2 receives the optical signal that distal end is transmitted, and is carried out opto-electronic conversion;
Step 5-9:CPRI M1 modules receive the CPRI data from step 5-8, and frame decoding, data decompression are carried out to it Wait power and energies;
Step 5-10:Base-Band Processing M1 carries out frequency-division section processing, bag to all frequency range data of CRPI M1 decomposition modules Contain:Gain control, Power Control, power statistic etc.;
Step 5-11:Through step 5-10 treated data, by D/A MN link pairs, it carries out digital-to-analogue conversion, goes forward side by side Row intermediate frequency filtering is realized conversion of the signal by base band to intermediate frequency, and is mixed with local oscillator, realizes that intermediate frequency turns to radiofrequency signal It changes;
Step 5-12:After T/R MN units carry out certain enhanced processing to uplink signal, finally finished receiving by base station The transmission of row data.
6th, the uplink work step of D-OMU coupled signals is extended:
Extend the work step 5-1 to 5- of the uplink work step 6-1 to step 6-8 and main D-OMU of D-OMU coupled signals 8 is identical, and details are not described herein again;
Step 6-9:CPRI M1 modules receive the CPRI data from step 6-8, and frame decoding, data decompression are carried out to it Power and energies are waited, and give the data sending for belonging to extension D-OMU to optical transceiver group M1;
Step 6-10:To handling the data of completion in step 6-9, main D-OMU optical transceivers group M1 is passed by optical fiber Transport to the optical transceiver group M2 of extension D-OMU;
Subsequent step 6-11 to 6-14 is identical with the work step 5-9 to 5-12 of main D-OMU, and details are not described herein again.
7th, kilomega network (WLAN) data mainly realize transparent transmission function, and system is not handled it, uplink work step It is as follows:
Step 7-1:Distal end D-ORU receives the WLAN network data of base station by RJ45;
Step 7-2:Kilomega network processing unit R1 parses gigabit network data, completes data extraction;
Step 7-3:CPRI R1 modules carry out framing to the gigabit network data extracted;
Step 7-4:Gigabit network data after the completion of framing is sent to near-end by the optical port of optical transceiver group R1 via optical fiber Main D-OMU;
Step 7-5:After near-end D-OMU receives fiber data by optical transceiver group M1, by near-end CPRI M1 to thousand Million network datas complete parsing;
Step 7-6:Kilomega network processing unit M1 is forwarded to data, most carries out uplink passback through RJ45 afterwards.
8th, when the main D-OMU of near-end carries out the covering of near-end wireless signal transmission by dual-mode antenna, uplink work step is such as Under:
The signal working method of the part is identical with the working method of main D-OMU coupling base station signals, and difference is closely The way of output of end signal.If using this kind of cloth net mode, only signal need to be exported into signal by dual-mode antenna AML in near-end .
The several key points ensured are also needed in specific implementation:1st, the digiboard DSPU and near-end T/R of near-end D-OMU is ensured The clock of MN is homologous;2nd, ensure that the clock of the digiboard DSPU and distal end T/R RN of distal end D-ORU are homologous;3rd, near-end D-OMU Base-Band Processing M1, CPRI M1 etc. may be employed one piece either polylith FPGA collaboration processing complete also or use FPGA and DSP Multicore architectures is waited to realize;4th, Base-Band Processing M1 and the CPRI M1 of distal end D-ORU may be employed at one piece or polylith FPGA collaborations Reason is completed, and also or using the multicore architectures such as FPGA and DSP is realized;5th, the prison of the DSPU units of near-end D-OMU and distal end D-OMU Control and digit chip configuration can cooperate with completion with CPLD by MCU or MCU.
Referring to Fig. 3, the networking mode of the present invention can support the network construction forms such as star, chain, annular.For strengthening system Reliability, an optical fiber can be increased and back up by being related to the part of optical fiber transmission, as shown in link 2.
Multi-frequency-band digital optical fiber distributed type antenna system of the present invention such as has the following advantages:1. near-end machine (OMU) possesses extension Optical port, for remote base station data to be carried out extension reception;2nd, kilomega network (WLAN) data penetration transmission function is introduced;3rd, it is digital Intermediate frequency (DSPU) unit and the separation of frequency conversion (T/R) unit, support hot plug, can realize arbitrary frequency range, arbitrary system as needed The independent assortment of formula;4th, remote termination (ORU) supports radio frequency combining output and each frequency range individually to export, and can meet current LTE The MIMO of system needs;5th, near-end power unit uses dual power supply, can support redundancy handoff functionality, realization ought be wherein a certain After the abnormity of power supply of road, system power supply can continue to work normally, and improve reliability.6th, system can support multiple frequency ranges to work at the same time, Typical Disposition is 4 frequencies, and highest can support 8 frequencies.
According to the disclosure and teachings of the above specification, those skilled in the art in the invention can also be to above-mentioned embodiment party Formula carries out appropriate change and modification.Therefore, the invention is not limited in specific embodiment disclosed and described above, to this Some modifications and changes of invention should also be as falling into the scope of the claims of the present invention.In addition, although this specification In used some specific terms, but these terms are merely for convenience of description, do not limit the present invention in any way.

Claims (6)

1. a kind of multi-frequency-band digital optical fiber distributed type antenna system, near-end machine and remote termination including being connected with each other communication are special Sign is:
The near-end machine include dual-mode antenna, coupler, near-end converter unit, near-end backboard unit, near-end digital intermediate frequency unit, Near-end power supply unit and near-end main control unit;The dual-mode antenna is used for the wireless access of proximal void signal, the coupler For coupling the radiofrequency signal of base station;The near-end converter unit is used to radiofrequency signal being changed into intermediate frequency letter in the downlink Number, local oscillator is then provided in the uplink to the near-end digital intermediate frequency unit, makes it that intermediate-freuqncy signal is mixed to radio frequency;It is described Near-end backboard unit is used for interconnection, the switching of power supply of the near-end converter unit and the near-end digital intermediate frequency unit;It is described Near-end digital intermediate frequency unit includes near-end analog to digital conversion circuit, near-end D/A converting circuit, near-end baseband processing unit, near-end and leads to With common wireless interface unit, near-end optical transceiver group, the near-end analog to digital conversion circuit is used to access the intermediate frequency of corresponding band Filtering and analog-to-digital conversion, the near-end D/A converting circuit is for the intermediate frequency filter after the digital-to-analogue conversion and its output of corresponding band Ripple, the near-end baseband processing unit are used for the Base-Band Processing of signal, and the near-end common public radio interface unit is used for Data compression, framing are carried out in downlink and is unziped it in the uplink, frame decoding, monitoring information and mesh information Transmission, the near-end optical transceiver group for convert photosignal and with the remote termination carry out signal interaction;It is described near Main control unit is held to carry out information exchange by the backboard unit and the near-end digital intermediate frequency unit, and to the near-end power supply Unit is monitored and switches;
The remote termination include remote digital intermediate frequency unit, distal end backboard unit, distal end converter unit, multiplexing combiner unit and Main control unit;The remote digital intermediate frequency unit includes distal end optical transceiver group, distal end common public radio interface unit, distal end Baseband processing unit, distal end analog to digital conversion circuit, far-end feedback analog to digital conversion circuit, distal end D/A converting circuit, the distal end For converting photosignal and carrying out signal interaction with the near-end machine, the general public wireless in distal end connects optical transceiver group Mouth unit carries out data decompression, frame decoding and carries out data compression, framing, monitoring letter in the uplink in the downlink The transmission of breath and mesh information, the distal end analog to digital conversion circuit are used for the intermediate frequency filtering and analog-to-digital conversion of multi-upstream access frequency range, The far-end feedback analog to digital conversion circuit completes phase for the intermediate frequency filtering of downlink coupling power amplifier signal, analog-to-digital conversion and cooperation The digital pre-distortion of frequency range is answered, the distal end D/A converting circuit is for the intermediate frequency after the digital-to-analogue conversion and its output of corresponding band Filtering;The distal end backboard unit is for the interconnection of the remote digital intermediate frequency unit and the distal end converter unit, power supply Switching;The distal end converter unit is used to be used to radiofrequency signal being changed into intermediate-freuqncy signal in uplink and backfeed loop, and downlink is then Local oscillator is provided to the remote digital intermediate frequency unit, makes it that intermediate-freuqncy signal is mixed to radio frequency;The multiplexing combiner unit is used In to uplink and downlink signals filtering and combining;The distal end main control unit is used for interaction and control into row information.
2. multi-frequency-band digital optical fiber distributed type antenna system according to claim 1, which is characterized in that the near-end machine bag Main near-end machine and proximally machine are included, the proximally machine is used to receive remote base station data, the near-end of the main near-end machine Optical transceiver group includes main near-end optical transceiver group and proximally optical transceiver group, and the main near-end optical transceiver group is used for and institute It states remote termination and carries out signal interaction, the proximally optical transceiver group is used to carry out signal interaction with the proximally machine.
3. multi-frequency-band digital optical fiber distributed type antenna system according to claim 1, which is characterized in that in the near-end machine In, the near-end converter unit and near-end digital intermediate frequency unit are separately positioned, the near-end converter unit and the near-end backboard Unit hot plug connects;In the remote termination, the distal end converter unit and remote digital intermediate frequency unit are separately positioned;Pass through The quantity of near-end converter unit described in hot plug and control access near-end frequency range number;Distal end is then by increasing or reducing T/ R quantity realizes the band number of control access distal end common numbers plate.
4. multi-frequency-band digital optical fiber distributed type antenna system according to claim 1, which is characterized in that the near-end machine Near-end power supply unit includes two power modules, during normal work, two power module parallel connections, by the way of flowing, when it In an abnormity of power supply when, another power supply work independently.
5. multi-frequency-band digital optical fiber distributed type antenna system according to claim 1, which is characterized in that if desired for using more Multiple output system is inputted, then needs to separate corresponding frequency range, and two channel datas of formation is passed through into multiplexing combiner Unit R 1 and multiplexing combiner unit R 2 individually emit;Discounting for multi-input multi-output system, then by all frequency ranges by same One multiplexing combiner R1 is exported to antenna and covered.
6. multi-frequency-band digital optical fiber distributed type antenna system according to claim 1, which is characterized in that the near-end machine is also The near-end kilomega network processing unit being connected including one with the near-end common public radio interface unit, the remote termination further include The one distal end kilomega network processing unit being connected with the distal end common public radio interface unit.
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