CN101521893B

CN101521893B - Wideband digital frequency selecting and radiating pulling system and signal processing method thereof

Info

Publication number: CN101521893B
Application number: CN2008100264432A
Authority: CN
Inventors: 胡应添; 张远见; 黄伯宁; 张跃军
Original assignee: Comba Telecom Systems China Ltd
Current assignee: Comba Network Systems Co Ltd
Priority date: 2008-02-25
Filing date: 2008-02-25
Publication date: 2010-12-01
Anticipated expiration: 2028-02-25
Also published as: CN101521893A

Abstract

The invention provides a wideband digital frequency selecting pulling system, wherein a DAU diplexer in DAU, a DAU wideband digital downlink, a DAU photoelectric conversion subsystem, a DAU wideband digital uplink, and a DAU diplexer are connected in sequence; a DAU power subsystem and a DAU monitoring subsystem are respectively connected with the DAU wideband digital downlink and the DAU widebanddigital uplink; the DRU photoelectric conversion subsystem in DRU, a DRU wideband digital uplink, a DRU diplexer, a DRU wideband digital downlink, and a DRU photoelectric conversion subsystem are con nected in sequence; and a DRU monitoring subsystem and a DRU power subsystem are respectively connected with the DRU wideband digital uplink and the DRU wideband digital downlink. The invention also provides a signal processing method which is achieved by adopting the system. The invention can reduce the use of analog devices and realize the bandwidth digital frequency radiating pulling system with different bandwidth.

Description

Wideband digital frequency-selecting radio frequency stretch system and signal processing method thereof

Technical field

The present invention relates to the covering system of moving communicating field, specifically be meant a kind of wideband digital frequency-selecting radio frequency stretch system and signal processing method thereof.

Background technology

Along with popularizing of mobile communications networks such as GSM, CDMA, PHS, TD-SCDMA, the rapid increase of mobile communication subscriber quantity, telephone traffic among the mobile network is also constantly increasing, cause communication network to be in the overload operation state, be easy to occur being similar to go offline, cross-talk, speech quality are bad, be difficult to phenomena of the failure such as online.In the face of growing traffic demand, need carry out continuous dilatation to satisfy the requirement of capacity and covering to network.Adopt the dilatation way of cell splitting that its limitation is arranged, constantly approaching along with stop spacing, therefore the interference of network just is difficult in the new base station of increase in the network also in continuous increase after the stop spacing of macrocell base stations acquires a certain degree.The repeater is as network optimization product, can improve and optimize the network signal covering quality, solving the indoor degree of depth covering of fiber-optic signal, solving signal covering aspect, the weak district of signal blind zone and signal and all play an important role, at home and abroad all obtaining in the mobile communications network using widely.

Optical fiber repeater have working stability, design and construction flexibly, avoid co-channel interference, can not self-excitation etc. advantage, play a very important role at tool aspect the covering of indoor and outdoor mobile communication signal.At present, in mobile communication engineering, using more is single carrier or analog optical fiber repeater, broadband, and its common feature all is to adopt a SAW (Surface Acoustic Wave) filter SAW to realize the frequency-selective filtering of analog signal is handled.For broadband signal, though its bandwidth is very wide, still be a single-carrier signal in essence, can adopt the filter processing method of single carrier to realize signal frequency-selecting processing fully.Along with the ripe of networking and development, mobile communication carrier to the repeater proposed big dynamically, demand on the extremely wide performances such as bandwidth, mixed networking and remote Optical Fiber Transmission.

Broadband analog optical fiber direct discharging station is widely used a kind of form in the present actual engineering, and it mainly is that one or more SAW (Surface Acoustic Wave) filter SAW are composed in series broadband signal frequency-selecting module, thereby realizes the filtering frequency-selecting of broadband signal is handled.Described broadband signal refers to the full frequency band bandwidth signal of a certain communication system correspondence or the signal of the interior band segment of full frequency band, adopt 900MHz frequency band GSM communication system as China, uplink band is 885～915MHz, the GSM bandwidth signal refers to the signal of any bandwidth in this frequency range, as signals such as 400KHz, 1MHz, 5MHz and 24MHz bandwidth.

Adopt the mode of a plurality of SAW (Surface Acoustic Wave) filter SAW cascades, mainly be to improve to rejection with outer interference signal, to satisfy the performance requirement of radio frequency stretch system, but such extended mode, will cause occurring following problem: a plurality of SAW (Surface Acoustic Wave) filter SAW cascades of (1) needs, because SAW (Surface Acoustic Wave) filter SAW is an analogue device, the consistency of performance is bad, debugging difficulty is very big, is unfavorable for debugging and batch process; (2) owing to need a plurality of SAW (Surface Acoustic Wave) filter SAW, will cause the volume of direct discharging station to enlarge, be unfavorable for realizing the miniaturization and the microminiaturization of direct discharging station; (3) be not easy to the expansion of system, SAW (Surface Acoustic Wave) filter SAW of every increase needs to change the layout of whole system, and increases the quantity of SAW (Surface Acoustic Wave) filter SAW, can increase system cost greatly; (4) the bad or signal leakage of the isolation between a plurality of SAW (Surface Acoustic Wave) filter SAW all can have influence on relevant frequency-selecting performance, thereby causes the machine system decreased performance.(5) the broadband analog optical fiber direct discharging station of the analog hardware circuit design of employing function singleness, very flexible, very difficult adaptation is the demand of the wireless communication system of different communication system, multiband nowadays.

Therefore, this traditional analog optical fiber repeater, broadband can not well realize big dynamically, the requirement on the extremely wide performances such as bandwidth, mixed networking and remote Optical Fiber Transmission.

Summary of the invention

The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of wideband digital frequency-selecting radio frequency stretch system is provided, Digital IF Processing technology in this system's usefulness software radio realizes the processing such as filtering to signal, to replace adopting SAW (Surface Acoustic Wave) filter SAW to carry out the method that frequency-selecting is handled in the analog optical fiber repeater, this system can kept under the constant situation of hardware platform, reduce the use of analogue device, and can be according to the far-drawing system demand, only need to revise software, can realize the wideband digital RF far-drawing system of different bandwidth, simultaneously, can guarantee that systematic function has good consistency.

The present invention also aims to provide a kind of The Wideband Signal Processing method that adopts the wideband digital frequency-selecting radio frequency stretch system to be realized.

Purpose of the present invention is achieved through the following technical solutions: the wideband digital frequency-selecting radio frequency stretch system, comprise digital access control cells D AU (Digital Access Control Unit) and digital radio frequency far-pulling cells D RU (Digital Remote RF Unit), described digital access control cells D AU links to each other with Remote Radio Unit DRU by optical fiber, described digital access control cells D AU comprises the DAU duplexer, DAU wideband digital down link, DAU opto-electronic conversion subsystem, DAU wideband digital up link, DAU power subsystem and DAU Monitor And Control Subsystem, described DAU duplexer links to each other with DAU wideband digital down link and DAU opto-electronic conversion subsystem successively, described DAU opto-electronic conversion subsystem links to each other with DAU wideband digital up link and DAU duplexer successively, described DAU power subsystem and DAU Monitor And Control Subsystem link to each other with DAU wideband digital up link and DAU wideband digital down link respectively, and described DAU duplexer also links to each other with the base station.

Described digital radio frequency far-pulling cells D RU comprises DRU opto-electronic conversion subsystem, DRU wideband digital up link, the DRU duplexer, DRU wideband digital down link, DRU Monitor And Control Subsystem and DRU power subsystem, described DRU opto-electronic conversion subsystem links to each other with DRU wideband digital up link and DRU duplexer successively, described DRU duplexer links to each other with DRU wideband digital down link and DRU opto-electronic conversion subsystem successively, described DRU Monitor And Control Subsystem and DRU power subsystem link to each other with DRU wideband digital up link and DRU wideband digital down link respectively, and described DRU duplexer also links to each other with covering/reception antenna.

Described DAU wideband digital down link comprises DAU radio frequency down-conversion subsystem, DAU-ADC conversion processor, DAU broadband signal digital down conversion module and the descending open interface of DAU, the input of described DAU radio frequency down-conversion subsystem links to each other with the output of DAU duplexer, the output of described DAU radio frequency down-conversion subsystem links to each other with DAU-ADC conversion processor, DAU broadband signal digital down conversion module and the descending open interface of DAU successively, and the output of the descending open interface of described DAU links to each other with the input of DAU opto-electronic conversion subsystem; Described DAU wideband digital up link comprises the up open interface of DAU, DAU broadband signal digital up-conversion module, DAU-DAC conversion processor and DAU RF up-converter subsystem, the input of the up open interface of described DAU links to each other with the output of DAU opto-electronic conversion subsystem, the output of the up open interface of described DAU links to each other with DAU broadband signal digital up-conversion module, DAU-DAC conversion processor and DAU RF up-converter subsystem successively, and the output of described DAU RF up-converter subsystem links to each other with the input of DAU duplexer; Described DAU power subsystem and DAU Monitor And Control Subsystem link to each other with DAU radio frequency down-conversion subsystem, DAU-ADC conversion processor, DAU broadband signal digital down conversion module, the descending open interface of DAU, DAU RF up-converter subsystem, DAU-DAC conversion processor, DAU broadband signal digital up-conversion module and the up open interface of DAU respectively.

Described DRU wideband digital up link comprises the up open interface of DRU, DRU broadband signal digital up-conversion module, DRU-DAC conversion processor, DRU RF up-converter subsystem and power amplifier, the input of the up open interface of described DRU links to each other with the output of DRU opto-electronic conversion subsystem, the output of the up open interface of described DRU links to each other with DRU broadband signal digital up-conversion module, DRU-DAC conversion processor, DRU RF up-converter subsystem and power amplifier successively, and the output of described power amplifier links to each other with the input of DRU duplexer; Described DRU wideband digital down link comprises low noise amplifier, DRU radio frequency down-conversion subsystem, the DRU-ADC conversion processor, the descending open interface of DRU broadband signal digital down conversion module and DRU, the input of described low noise amplifier links to each other with the output of DRU duplexer, the output of described low noise amplifier successively with DRU radio frequency down-conversion subsystem, the DRU-ADC conversion processor, the descending open interface of DRU broadband signal digital down conversion module and DRU links to each other, and the output of the descending open interface of described DRU links to each other with the input of DRU opto-electronic conversion subsystem; Described DRU Monitor And Control Subsystem and DRU power subsystem link to each other with the up open interface of DRU, DRU broadband signal digital up-conversion module, DRU-DAC conversion processor, DRU RF up-converter subsystem, power amplifier, the descending open interface of DRU, DRU broadband signal digital down conversion module, DRU-ADC conversion processor, DRU radio frequency down-conversion subsystem and low noise amplifier respectively.

Adopt the processing method of the wideband digital signal of said system realization, may further comprise the steps:

(1) the DAU radiofrequency signal that is coupled from the base station, carry out passing through DAU radio frequency down-conversion subsystem after the Filtering Processing through the DAU duplexer, filtered radiofrequency signal is downconverted to analog intermediate frequency signal, through the DAU-ADC conversion processor analog intermediate frequency signal is converted to the high-speed figure intermediate-freuqncy signal again;

(2) the high-speed figure intermediate-freuqncy signal in broadband enters DAU broadband signal digital down conversion module, and the high-speed figure intermediate-freuqncy signal in broadband is carried out mixing, extraction and Filtering Processing, low speed baseband I, Q signal after output is handled through molding filtration;

(3) low speed baseband I, Q signal are through the descending open interface of DAU, and carry out framing according to the framing agreement that framing common protocol such as CPRI, OBASI or businessman self formulate and handle, and the digital signal that framing obtains later on is sent to DAU opto-electronic conversion subsystem changes the generation digital optical signal, by optical fiber this digital optical signal is transferred in the DRU opto-electronic conversion subsystem again;

(4) DRU opto-electronic conversion subsystem is converted to digital signal with the digital optical signal of input, and the framing agreement of formulating according to framing common protocol such as CPRI, OBASI or businessman self in the up open interface of DRU is separated frame and is handled, and the digital signal that obtains is passed through DRU broadband signal digital up-conversion module carry out interpolation, filtering and Frequency mixing processing, generate digital medium-frequency signal at a high speed;

(5) the high-speed figure intermediate-freuqncy signal of Sheng Chenging, handle through the DRU-DAC conversion processor, the output analog if signal, this analog if signal is converted to radiofrequency signal through DRU RF up-converter subsystem, carry out power amplification by power amplifier again, by covering/reception antenna signal is carried out in the specific region at last and cover;

(6) the DRU duplexer is by covering/reception antenna received RF signal, carry out Filtering Processing through the DRU duplexer, filtered radiofrequency signal enters low noise amplifier and carries out processing and amplifying, again the radiofrequency signal after the processing and amplifying is input to DRU radio frequency down-conversion subsystem and changes, obtain analog if signal;

(7) analog if signal is through the conversion of DRU-ADC conversion processor, generate the high-speed figure intermediate-freuqncy signal, this high-speed figure intermediate-freuqncy signal is input to DRU broadband signal digital down conversion module again and carries out mixing, extraction and Filtering Processing, low speed baseband I, Q signal after output is handled through molding filtration;

(8) low speed baseband I, Q signal are in the descending open interface of DRU, the framing agreement of formulating according to framing common protocol such as CPRI, OBASI or businessman self is carried out the framing of data and is handled, and the digital signal that framing is good is sent to DRU opto-electronic conversion subsystem and handles, and obtains digital optical signal;

(9) digital optical signal of exporting from DRU opto-electronic conversion subsystem passes through the processing of DAU opto-electronic conversion subsystem, the framing agreement that generates digital signal and formulate according to framing common protocol such as CPRI, OBASI or businessman self in the up open interface of DAU is carried out the frame of separating of data and is handled, and will separate digital signal that frame obtains later on and be input to DAU broadband signal digital up-conversion module and carry out interpolation, filtering and Frequency mixing processing, generate the high-speed figure intermediate-freuqncy signal;

(10) the high-speed figure intermediate-freuqncy signal is changed in the DAU-DAC conversion processor, generate analog if signal, this analog if signal enters DAU RF up-converter subsystem again and simulates upconversion process, analog if signal is converted to radiofrequency signal, this radiofrequency signal is carried out Filtering Processing through the DAU duplexer again, by the DAU duplexer the direct coupling of this radiofrequency signal is being sent to the base station at last.

The technical scheme of foregoing invention adopts and will carry out the framing processing through low speed baseband I, Q data after the Digital Down Convert processing (DDC), carries out transfer of data by optical fiber, realizes the long-distance transmissions of signal of communication.Same, can handle carrying out corresponding framing through the high-speed figure intermediate-freuqncy signal after the ADC transducer conversion process, carry out transfer of data by optical fiber, equally also can realize the long-distance transmissions of signal of communication.Therefore, similar to the design of technique scheme, employing is to carrying out corresponding framing and data processing through the high-speed figure intermediate-freuqncy signal after the conversion of ADC transducer, can form another following technical scheme: promptly, described DAU wideband digital down link comprises DAU radio frequency down-conversion subsystem, the DAU-ADC conversion processor, the descending open interface of DAU, the input of described DAU radio frequency down-conversion subsystem links to each other with the output of DAU duplexer, the output of described DAU radio frequency down-conversion subsystem links to each other with DAU-ADC conversion processor and the descending open interface of DAU successively, and the output of the descending open interface of described DAU links to each other with the input of DAU opto-electronic conversion subsystem; Described DAU wideband digital up link comprises the up open interface of DAU, DAU broadband signal digital down conversion module, DAU broadband signal digital up-conversion module, DAU-DAC conversion processor and DAU RF up-converter subsystem, the input of the up open interface of described DAU links to each other with the output of DAU opto-electronic conversion subsystem, the output of the up open interface of described DAU successively with DAU broadband signal digital down conversion module, DAU broadband signal digital up-conversion module, DAU-DAC conversion processor and DAU RF up-converter subsystem link to each other, and the output of described DAU RF up-converter subsystem links to each other with the input of DAU duplexer; Described DAU power subsystem and DAU Monitor And Control Subsystem link to each other with DAU radio frequency down-conversion subsystem, DAU-ADC conversion processor, the descending open interface of DAU, DAU RF up-converter subsystem, DAU-DAC conversion processor, DAU broadband signal digital up-conversion module, DAU broadband signal digital down conversion module and the up open interface of DAU respectively.

Described DRU wideband digital up link comprises the up open interface of DRU, DRU broadband signal digital down conversion module, DRU broadband signal digital up-conversion module, the DRU-DAC conversion processor, DRU RF up-converter subsystem and power amplifier, the input of the up open interface of described DRU links to each other with the output of DRU opto-electronic conversion subsystem, the output of the up open interface of described DRU successively with DRU broadband signal digital down conversion module, DRU broadband signal digital up-conversion module, the DRU-DAC conversion processor, DRU RF up-converter subsystem and power amplifier link to each other, and the output of described power amplifier links to each other with the input of DRU duplexer; Described DRU wideband digital down link comprises low noise amplifier, DRU radio frequency down-conversion subsystem, DRU-ADC conversion processor, the descending open interface of DRU, the input of described low noise amplifier links to each other with the output of DRU duplexer, the output of described low noise amplifier links to each other with DRU radio frequency down-conversion subsystem, DRU-ADC conversion processor and the descending open interface of DRU successively, and the output of the descending open interface of described DRU links to each other with the input of DRU opto-electronic conversion subsystem; Described DRU Monitor And Control Subsystem and DRU power subsystem link to each other with the up open interface of DRU, DRU broadband signal digital down conversion module, DRU broadband signal digital up-conversion module, DRU-DAC conversion processor, DRU RF up-converter subsystem, power amplifier, the descending open interface of DRU, DRU-ADC conversion processor, DRU radio frequency down-conversion subsystem and low noise amplifier respectively.

Corresponding with it, adopt the processing method of the wideband digital signal that the system after the above-mentioned variation realizes, may further comprise the steps:

(1) the DAU radiofrequency signal that is coupled from the base station, carry out passing through DAU radio frequency down-conversion subsystem after the Filtering Processing through the DAU duplexer, filtered radiofrequency signal is downconverted to intermediate-freuqncy signal, through the DAU-ADC conversion processor intermediate-freuqncy signal is converted to the high-speed figure intermediate-freuqncy signal again;

(2) the framing agreement formulated according to framing common protocol such as CPRI, OBASI or businessman self in the descending open interface of DAU of high-speed figure intermediate-freuqncy signal is carried out framing and is handled, and the digital signal that framing is later is sent to DAU opto-electronic conversion subsystem and is converted to digital optical signal, by optical fiber this digital optical signal is transferred in the DRU opto-electronic conversion subsystem again;

(3) DRU opto-electronic conversion subsystem is converted to digital signal with the digital optical signal of input, and the framing agreement of formulating according to framing common protocol such as CPRI, OBASI or businessman self in the up open interface of DRU is separated frame and is handled, and the digital signal that obtains carried out mixing, data pick-up and Filtering Processing through DRU broadband signal digital down conversion module, obtain baseband I, Q signal behind the molding filtration;

(4) baseband I, Q signal carry out interpolation, filtering and Frequency mixing processing through DRU broadband signal digital up-conversion module, obtain the high-speed figure intermediate-freuqncy signal, again through DRU-DAC conversion processor output analog if signal, this analog if signal is converted to radiofrequency signal through DRU RF up-converter subsystem, carry out power amplification by power amplifier again, by covering/reception antenna signal is carried out in the specific region at last and cover;

(5) the DRU duplexer is by covering/reception antenna received RF signal, at first carry out Filtering Processing through the DRU duplexer, again filtered radiofrequency signal is input to and carries out processing and amplifying in the low noise amplifier, radiofrequency signal after the processing and amplifying is input to DRU radio frequency down-conversion subsystem changes, obtain analog if signal;

(6) analog if signal is through the conversion of DRU-ADC conversion processor, obtain the high-speed figure intermediate-freuqncy signal, and this high-speed figure intermediate-freuqncy signal is input in the descending open interface of DRU, the framing agreement of formulating according to framing common protocol such as CPRI, OBASI or businessman self is carried out the framing of data and is handled, and the digital signal that framing is good is sent to DRU opto-electronic conversion subsystem and handles, and obtains digital optical signal;

(7) handle through DAU opto-electronic conversion subsystem from the digital optical signal of DRU opto-electronic conversion subsystem output, obtain digital signal and pass through the up open interface of DAU, the framing agreement of formulating according to framing common protocol such as CPRI, OBASI or businessman self is carried out the frame of separating of data and is handled, and will separate the digital signal that frame obtains later on and be input to DAU broadband signal digital down conversion module;

(8) the high-speed figure intermediate-freuqncy signal is carried out mixing, data pick-up and the Filtering Processing of signal in DAU broadband signal digital down conversion module, obtain baseband I, Q signal behind the molding filtration, and this baseband I, Q signal are input to DAU broadband signal digital up-conversion module;

(9) interpolation, filtering and the Frequency mixing processing of process DAU broadband signal digital up-conversion module, obtain the high-speed figure intermediate-freuqncy signal, and be converted to analog if signal through the DAU-DAC conversion processor, this analog if signal is simulated upconversion process through DAU RF up-converter subsystem again, generate radiofrequency signal, send into the base station after the DAU duplexer directly is coupled this radiofrequency signal.

Above-described DAU broadband signal digital down conversion module and DRU broadband signal digital down conversion module include frequency mixing module, NCO (digital controlled oscillator) generation module, DDC self-adaptive decision device, multiple variable extraction filter and base band formed filter; The output of described NCO generation module links to each other with the input of frequency mixing module; The output of described frequency mixing module links to each other with DDC self-adaptive decision device, multiple variable extraction filter and base band formed filter successively; Described DAU broadband signal digital up-conversion module and DRU broadband signal digital up-conversion module include DUC self-adaptive decision device, the variable interpolation filter group of multiple and I, the multistage modulation module of Q signal; The output of described DUC self-adaptive decision device links to each other with the variable interpolation filter group of multiple and I, the multistage modulation module of Q signal successively.

The present invention compared with prior art has following advantage and beneficial effect:

(1) can realize dynamically and long-distance transmissions realizing the variation of networking mode, as the mode of star-like, daisy chain, annular, tree-like and mixed networking to the big of broadband signal;

(2) based on software radio thought, adopt extraction, interpolation, mixing and the Filtering Processing of digital if technology realization to broadband signal, abandoned the processing method of utilizing SAW filtering in the simulation direct discharging station, reduced the use of analogue device, improve the consistency of systematic function, be convenient to system debug and production;

(3) method of employing digital filtering, that the passband fluctuation of filter can be done is very little, and it is very high that the outer inhibition of band is done, with the performance of optimization signal filtering, thus the performance of raising radio frequency stretch system;

(4) phase place of digital filter has good linear characteristic, can avoid the influence of the phase nonlinear of SAW (Surface Acoustic Wave) filter SAW to systematic function;

(5) be easy to realize the miniaturization and the microminiaturization of wideband digital frequency-selecting radio frequency stretch system.

Description of drawings

Fig. 1 is a kind of system principle structural representation of the present invention;

Fig. 2 is an another kind of system principle structural representation of the present invention;

Fig. 3 is a DAU/DRU broadband signal digital down conversion module schematic diagram of the present invention;

Fig. 4 is a DAU/DRU broadband signal digital up-conversion module diagram of the present invention;

Fig. 5 is the star-like networking mode schematic diagram of DAU and a plurality of DRU;

Fig. 6 is DAU and a plurality of DRU daisy chain networking mode schematic diagram;

Fig. 7 is DAU and a plurality of DRU annular networking mode schematic diagram;

Fig. 8 is a plurality of DAU and a plurality of DRU mixed networking mode schematic diagram.

Embodiment

Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.

As shown in Figure 1, the wideband digital frequency-selecting radio frequency stretch system is connected to form by optical fiber and digital radio frequency far-pulling cells D RU by digital access control cells D AU.Described digital access control cells D AU is made up of DAU duplexer, DAU wideband digital down link, DAU opto-electronic conversion subsystem, DAU wideband digital up link, DAU power subsystem and DAU Monitor And Control Subsystem.Described digital radio frequency far-pulling cells D RU is made up of DRU opto-electronic conversion subsystem, DRU wideband digital up link, DRU duplexer, DRU wideband digital down link, DRU Monitor And Control Subsystem and DRU power subsystem.Wherein, an input and an output of DAU duplexer all link to each other with the base station, and an output of DRU duplexer links to each other with covering/reception antenna.The input of the DAU duplexer that links to each other with the base station be used to the to be coupled radiofrequency signal of base station, and being transferred to the DAU duplexer, the output of the DAU duplexer that links to each other with the base station then is used for the resulting signal of DAU RF up-converter subsystem is transferred to the base station through the DAU duplexer; The DRU duplexer that links to each other with covering/reception antenna then is used to cover and receive the radiofrequency signal of appointed area.

DAU wideband digital down link is connected to form successively by DAU radio frequency down-conversion subsystem, DAU-ADC conversion processor, DAU broadband signal digital down conversion module and the descending open interface of DAU.The input of DAU radio frequency down-conversion subsystem links to each other with another output of DAU duplexer, and the output of the descending open interface of DAU links to each other with the input of DAU opto-electronic conversion subsystem.DAU wideband digital up link is connected to form successively by the up open interface of DAU, DAU broadband signal digital up-conversion module, DAU-DAC conversion processor and DAU RF up-converter subsystem.The input of the up open interface of DAU links to each other with an output of DAU opto-electronic conversion subsystem, and the output of DAU RF up-converter subsystem links to each other with another input of DAU duplexer.

The output of DAU power subsystem and DAU Monitor And Control Subsystem links to each other with another input of DAU RF up-converter subsystem, DAU radio frequency down-conversion subsystem, DAU-ADC conversion processor, DAU-DAC conversion processor, DAU broadband signal digital down conversion module, DAU broadband signal digital up-conversion module, the up open interface of DAU and the descending open interface of DAU respectively, wherein, the DAU power subsystem provides working power for them, the DAU Monitor And Control Subsystem then provides monitoring and controlled function for them, and the anomaly that occurs is carried out alarming processing.

Another output of DAU opto-electronic conversion subsystem links to each other with an input of DRU opto-electronic conversion subsystem by optical fiber, and sends the digital optical signal in the DAU opto-electronic conversion subsystem to DRU opto-electronic conversion subsystem by optical fiber.

DRU wideband digital up link is connected to form successively by the up open interface of DRU, DRU broadband signal digital up-conversion module, DRU-DAC conversion processor, DRU RF up-converter subsystem and power amplifier.The input of the up open interface of DRU links to each other with the output of DRU opto-electronic conversion subsystem, and receives the digital signal of DRU opto-electronic conversion subsystem output, and the output of power amplifier links to each other with the input of DRU duplexer.

DRU wideband digital down link is connected to form successively by low noise amplifier, DRU radio frequency down-conversion subsystem, DRU-ADC conversion processor, DRU broadband signal digital down conversion module and the descending open interface of DRU.The input of low noise amplifier links to each other with an output of DRU duplexer, and is used to receive the signal of DRU duplexer, and the output of the descending open interface of DRU links to each other with another input of DRU opto-electronic conversion subsystem.

The output of DRU power subsystem and DRU Monitor And Control Subsystem links to each other with another input of the up open interface of DRU, DRU broadband signal digital up-conversion module, DRU-DAC conversion processor, DRU RF up-converter subsystem, power amplifier, the descending open interface of DRU, DRU broadband signal digital down conversion module, DRU-ADC conversion processor, DRU radio frequency down-conversion subsystem and low noise amplifier respectively.Wherein, the DRU power subsystem provides working power for them, and the DRU Monitor And Control Subsystem then detects and controlled function for they provide, and the anomaly that occurs is carried out alarming processing.Another output of DRU duplexer links to each other with covering/reception antenna, is used to cover or receive the radiofrequency signal of appointed area.

From the downstream signal flow process of base station be:

The DAU duplexer will carry out Filtering Processing from the radiofrequency signal that base station coupling comes, and send into DAU radio frequency down-conversion subsystem behind the useless signal and carry out the radiofrequency signal down-converted, the generation analog if signal the filtering band outside; This analog if signal that generates carries out analog-to-digital conversion through the DAU-ADC transducer again, generates the high-speed figure intermediate-freuqncy signal; The high-speed figure intermediate-freuqncy signal that generates is carried out mixing, extraction and the Filtering Processing of high-speed figure intermediate-freuqncy signal again through DAU broadband signal digital down conversion module, low speed baseband I, Q signal after output is handled through molding filtration; The baseband I that generates, Q signal is input in the descending open interface of DAU again, and according to the framing common protocol, as the CPRI (Common Public Radio Interface general public wave point) that utilizes the common protocol tissue to issue, the framing agreement that OBASI (Open BaseStation Architecture Initiative base station common architecture agreement) and radio frequency stretch system businessman self formulate, with this low speed baseband I, Q signal carries out framing and handles the generation digital signal, and this digital signal is input to DAU opto-electronic conversion subsystem again generates digital optical signal, be input in the DRU opto-electronic conversion subsystem; DRU opto-electronic conversion subsystem is after receiving the digital optical signal of input, this digital optical signal is converted to digital signal, and the digital signal after will changing is input in the up open interface of DRU, and in the up open interface of DRU according to the framing common protocol, as utilize the disclosure agreement such as CPRI, OBASI of common protocol tissue issue and the framing agreement that radio frequency stretch system businessman self formulates, this digital signal of input is carried out the frame of separating of data and handle, and will separate the digital data transmission that obtains behind the frame and give DRU broadband signal digital up-conversion module; DRU broadband signal digital up-conversion module is carried out interpolation, filtering and Frequency mixing processing to the digital signal of input, generates the high-speed figure intermediate-freuqncy signal; This high-speed figure intermediate-freuqncy signal is carried out digital-to-analogue conversion through the DRU-DAC conversion processor again, generates analog if signal; The analog if signal that generates enters into DRU RF up-converter subsystem and carries out upconversion process, generates radiofrequency signal; This radiofrequency signal is carried out power amplification through power amplifier, carries out Filtering Processing through the DRU duplexer again and obtains comparatively pure radiofrequency signal, realizes the signal of specific region is covered by covering/reception antenna at last.

From the upward signal flow process of covering/reception antenna emission be:

The DRU duplexer receives aerial radiofrequency signal by covering/reception antenna, and the Filtering Processing of process DRU duplexer, behind the outer unwanted signal of filtering band, through the DRU duplexer this radiofrequency signal is input to low noise amplifier again; Low noise amplifier carries out the low noise processing and amplifying later in the radiofrequency signal that receives input, and the signal after will handling again is input to and carries out the analog down processing in the DRU radio frequency down-conversion subsystem, generates analog if signal; The analog if signal that generates is through the processing of DRU-ADC conversion processor, this analog if signal is converted to the high-speed figure intermediate-freuqncy signal, and this high-speed figure intermediate-freuqncy signal is input to mixing, extraction and the Filtering Processing of carrying out the high-speed figure intermediate-freuqncy signal in the DRU broadband signal digital down conversion module, export through low speed baseband I, Q signal after the molding filtration processing, and this signal is input to the descending open interface of DRU; The descending open interface of DRU is after receiving the high-speed figure intermediate-freuqncy signal of input, according to the framing common protocol, as utilize the disclosure agreement such as CPRI, OBASI of common protocol tissue issue and the framing agreement that radio frequency stretch system businessman self formulates, carry out the framing of data and handle, generate digital signal; The digital signal that generates enters DRU opto-electronic conversion subsystem and changes, and generates digital optical signal, and is input in the DAU opto-electronic conversion subsystem through optical fiber; DAU opto-electronic conversion subsystem receives the digital optical signal of input, and this digital optical signal is converted to digital signal is input in the up open interface of DAU; The up open interface of DAU is according to the framing common protocol, as utilize the disclosure agreement such as CPRI, OBASI of common protocol tissue issue and the framing agreement that radio frequency stretch system businessman self formulates, this digital signal is separated frame handle, the digital signal that will separate again behind the frame is input to DAU broadband signal digital up-conversion module; The digital signal that generates is process interpolation, filtering and Frequency mixing processing in DAU broadband signal digital up-conversion module, generate the high-speed figure intermediate-freuqncy signal, and the high-speed figure intermediate-freuqncy signal that generates is input to the DAU-DAC conversion processor carries out digital-to-analogue conversion and handle, generate analog if signal; The analog if signal that generates enters DAU RF up-converter subsystem again and simulates upconversion process, analog if signal is converted to radiofrequency signal, and carries out filtering by the DAU duplexer, exports comparatively pure radiofrequency signal, and directly coupling is input to the base station.

As shown in Figure 2, the structure basically identical of the structure of this system and the described system of Fig. 1, difference only are the difference of composition separately of DAU wideband digital down link, DAU wideband digital up link, DRU wideband digital up link and DRU wideband digital down link.As shown in Figure 2, this DAU wideband digital down link is connected to form successively by DAU radio frequency down-conversion subsystem, DAU-ADC conversion processor and the descending open interface of DAU.The input of DAU radio frequency down-conversion subsystem links to each other with another output of DAU duplexer, and the output of the descending open interface of DAU links to each other with the input of DAU opto-electronic conversion subsystem.DAU wideband digital up link is connected to form successively by the up open interface of DAU, DAU broadband signal digital down conversion module, DAU broadband signal digital up-conversion module, DAU-DAC conversion processor and DAU RF up-converter subsystem.The input of the up open interface of DAU links to each other with the output of DAU opto-electronic conversion subsystem, and the output of DAU RF up-converter subsystem links to each other with another input of DAU duplexer.

The output of DAU power subsystem and DAU Monitor And Control Subsystem links to each other with another input of DAU RF up-converter subsystem, DAU radio frequency down-conversion subsystem, DAU-ADC conversion processor, DAU-DAC conversion processor, DAU broadband signal digital down conversion module, DAU broadband signal digital up-conversion module and up open interface of DAU and the descending open interface of DAU respectively, wherein, the DAU power subsystem provides working power for them, the DAU Monitor And Control Subsystem then provides monitoring and controlled function for them, and the anomaly that occurs is carried out alarming processing.

DRU wideband digital up link is connected to form successively by the up open interface of DRU, DRU broadband signal digital down conversion module, DRU broadband signal digital up-conversion module, DRU-DAC conversion processor, DRU RF up-converter subsystem and power amplifier.The input of the up open interface of DRU links to each other with the output of DRU opto-electronic conversion subsystem, and receives the digital signal of DRU opto-electronic conversion subsystem output, and the output of power amplifier links to each other with the input of DRU duplexer.

DRU wideband digital down link is connected to form successively by low noise amplifier, DRU radio frequency down-conversion subsystem, DRU-ADC conversion processor and the descending open interface of DRU.The input of low noise amplifier links to each other with an output of DRU duplexer, and is used to receive the signal of DRU duplexer, and the output of the descending open interface of DRU links to each other with another input of DRU opto-electronic conversion subsystem.

The output of DRU power subsystem and DRU Monitor And Control Subsystem links to each other with another input of the up open interface of DRU, DRU broadband signal digital down conversion module, DRU broadband signal digital up-conversion module, DRU-DAC conversion processor, DRU RF up-converter subsystem, power amplifier, the descending open interface of DRU, DRU-ADC conversion processor, DRU radio frequency down-conversion subsystem and low noise amplifier respectively.Wherein, the DRU power subsystem provides working power for them, and the DRU Monitor And Control Subsystem then detects and controlled function for they provide, and the anomaly that occurs is carried out alarming processing.

From the downstream signal flow process of base station be:

The DAU duplexer will carry out Filtering Processing from the radiofrequency signal that base station coupling comes, and send into DAU radio frequency down-conversion subsystem behind the useless signal and carry out the radiofrequency signal down-converted, the generation analog if signal the filtering band outside; This analog if signal that generates carries out analog-to-digital conversion through the DAU-ADC transducer again, generates the high-speed figure intermediate-freuqncy signal; The high-speed figure intermediate-freuqncy signal that generates is input in the descending open interface of DAU, and according to the framing common protocol, as utilize CPRI, the OBASI of common protocol tissue issue and the framing agreement that radio frequency stretch system businessman self formulates, this high-speed figure intermediate-freuqncy signal is carried out framing to be handled, and will finish the later digital signal of framing and be input to DAU opto-electronic conversion subsystem again and generate digital optical signal, be input in the DRU opto-electronic conversion subsystem; DRU opto-electronic conversion subsystem is converted to digital signal with this digital optical signal after receiving the digital optical signal of input, and the digital signal after will changing is input in the up open interface of DRU; The up open interface of DRU is according to the framing common protocol, as utilize the disclosure agreement such as CPRI, OBASI of common protocol tissue issue and the framing agreement that radio frequency stretch system businessman self formulates, this digital signal of input is carried out the frame of separating of data and handle, and will separate the digital data transmission that obtains behind the frame and give DRU broadband signal digital down conversion module; DRU broadband signal digital down conversion module is carried out mixing, data pick-up and Filtering Processing to the digital signal of input, forms through baseband I, Q signal behind the molding filtration, and I, the Q signal that forms is input to DRU broadband signal digital up-conversion module; DRU broadband signal digital up-conversion module is carried out interpolation, filtering and Frequency mixing processing to I, the Q signal of input, obtains the high-speed figure intermediate-freuqncy signal, and this high-speed figure intermediate-freuqncy signal is carried out digital-to-analogue conversion through the DRU-DAC conversion processor again, generates analog if signal; The analog if signal that generates enters into DRU RF up-converter subsystem and carries out upconversion process, generates radiofrequency signal; This radiofrequency signal is carried out power amplification through power amplifier, carries out Filtering Processing through the DRU duplexer again and obtains comparatively pure radiofrequency signal, is covering by the signal of covering/reception antenna realization to the specific region at last.

From the upward signal flow process of covering/reception antenna emission be:

The DRU duplexer receives aerial radiofrequency signal by covering/reception antenna, and the Filtering Processing of process DRU duplexer, behind the outer unwanted signal of filtering band, through the DRU duplexer this radiofrequency signal is input to low noise amplifier again; Low noise amplifier carries out the low noise processing and amplifying later in the radiofrequency signal that receives input, and the signal after will handling again is input to and carries out the analog down processing in the DRU radio frequency down-conversion subsystem, generates analog if signal; The analog if signal that generates is converted to the high-speed figure intermediate-freuqncy signal through the DRU-ADC conversion processor with this analog if signal, and this high-speed figure intermediate-freuqncy signal is input to the descending open interface of DRU; The descending open interface of DRU is after receiving the high-speed figure intermediate-freuqncy signal of input, according to the framing common protocol, as utilize the disclosure agreement such as CPRI, OBASI of common protocol tissue issue and the framing agreement that radio frequency stretch system businessman self formulates, carry out the framing of data and handle, generate digital signal; The digital signal that generates enters DRU opto-electronic conversion subsystem and changes, and generates digital optical signal, and is input in the DAU opto-electronic conversion subsystem through optical fiber; DAU opto-electronic conversion subsystem receives the digital optical signal of input, and this digital optical signal is converted to digital signal is input in the up open interface of DAU; The up open interface of DAU is according to the framing common protocol, as utilize the disclosure agreement such as CPRI, OBASI of common protocol tissue issue and the framing agreement that radio frequency stretch system businessman self formulates, this digital signal is separated frame handle, the digital signal that will separate again behind the frame is input to DAU broadband signal digital down conversion module; DAU broadband signal digital down conversion module is carried out mixing, data pick-up and Filtering Processing with the digital signal of input, forms through baseband I, Q signal behind the molding filtration, and I, the Q signal that forms is input to DAU broadband signal digital up-conversion module; DAU broadband signal digital up-conversion module obtains the high-speed figure intermediate-freuqncy signal through interpolation, filtering and Frequency mixing processing, and the high-speed figure intermediate-freuqncy signal that will generate is input to the DAU-DAC conversion processor and carries out the digital-to-analogue conversion processing, the generation analog if signal; The analog if signal that generates enters DAU RF up-converter subsystem again and simulates upconversion process, analog if signal is converted to radiofrequency signal, and will crosses the DAU duplexer and carry out filtering, exports comparatively pure radiofrequency signal, and directly coupling is input to the base station.

As shown in Figure 3, DAU broadband signal digital down conversion module is duplicate with the structure and the operation principle of DRU broadband signal digital down conversion module, what its received is the high-speed figure intermediate-freuqncy signal, output be through mixing, extraction, filtered digital baseband I, Q signal.DAU/DRU broadband signal digital down conversion module is handled DDC self-adaptive decision device, multiple variable extraction filter and base band formed filter by frequency mixing module, digital controlled oscillator NCO generation module, Digital Down Convert and is formed.Two outputs of described digital controlled oscillator NCO generation module are exported cos and sin signal, link to each other with input of frequency mixing module respectively, and another input of frequency mixing module then is used to receive the digital medium-frequency signal of input.The output of described frequency mixing module is connected with the input that DDC self-adaptive decision device is handled in Digital Down Convert; The output that DDC self-adaptive decision device is handled in described Digital Down Convert is connected with the input of multiple variable extraction filter; The output of described multiple variable extraction filter is connected with the input of base band formed filter.

The input of NCO in the DAU broadband signal digital down conversion module receives the digital medium-frequency signal after frame is separated in from DAU up open interface output, the input of the digital controlled oscillator in the DRU broadband signal digital down conversion module then receives the digital medium-frequency signal after frame is separated in from the up open interface of DRU output, they carry out Frequency mixing processing by the NCO (digital controlled oscillator) of different frequent points, also promptly: the I that separates the digital medium-frequency signal behind the frame, cos and sin signal that Q signal and digital controlled oscillator NCO generation module produce are input in the frequency mixing module simultaneously, and output is through the zero intermediate frequency I after the Frequency mixing processing, Q signal.Zero intermediate frequency I, the Q signal of frequency mixing module output are input in the DDC self-adaptive decision device, the characteristic information of DDC self-adaptive decision device according to I, Q signal handled in Digital Down Convert, as information such as data speed, processing bandwidth, adaptive selection meets data pick-up multiple and the filter coefficient that speed, bandwidth etc. require.Described multiple variable extraction filter receives from Digital Down Convert and handles the output information of DDC self-adaptive decision device and I, Q signal, and handle the information that DDC self-adaptive decision device provides according to Digital Down Convert, carry out the extraction and the Filtering Processing of data, I, Q signal after output is handled through suitable filtering extraction.I, the Q signal of the output of multiple variable extraction filter, owing to select and be with the outer requirement that signal does not usually meet the digital frequency-selecting module that suppresses in the band of signal, compensation and outer inhibition of band handle in need being with the I behind the filtering extraction, Q signal, therefore, need to adopt the base band formed filter to carry out the moulding Filtering Processing, formed filter is according to the demand of digital frequency-selecting module, adopt certain strategy, realization is to the compensation deals of signal in the passband, simultaneously, improve the outer inhibition ability of band, improve the performance of digital frequency-selecting module.Variable multiple decimation filter and formed filter can be the filter of FIR, IIR, CIC, HB filter or other form.Described DAU broadband signal digital down conversion module can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.

As shown in Figure 4, DRU broadband signal digital up-conversion module is duplicate with the structure and the operation principle of DAU broadband signal digital up-conversion module, reception be digital baseband I, Q signal, output high-speed figure intermediate-freuqncy signal.DAU/DRU broadband signal digital up-conversion module is made up of Digital Up Convert processing DUC self-adaptive decision device, the variable interpolation filter group of multiple and I, the multistage modulation module of Q signal.The output that DUC self-adaptive decision device is handled in described Digital Up Convert is connected with the input of the variable interpolation filter group of multiple; The output of the variable interpolation filter group of described multiple is connected with the input of I, the multistage modulation module of Q signal.DAU broadband signal digital up-conversion module receives the baseband I from DAU broadband signal digital down conversion module, Q signal, Digital Up Convert in the DAU broadband signal digital up-conversion module is handled DUC self-adaptive decision device according to baseband I, the data rate of Q data, characteristic informations such as bandwidth, and require the data rate exported in conjunction with the digital intermediate frequency system, requirements such as bandwidth, adaptive selection meets speed, the interpolation of data multiple that bandwidth etc. require, and according to the still multistage interpolation processing of the definite selection of multiple one-level interpolation processing, and, reasonably select the coefficient of interpolation filter etc. according to the requirement that each grade interpolation is handled.The variable interpolation filter group of received of described multiple is handled the output information of DUC self-adaptive decision device and I, Q signal from Digital Up Convert, and handle the information that DUC self-adaptive decision device provides according to Digital Up Convert, carry out the interpolation and the Filtering Processing of data, I, Q signal after output is handled through suitable interpolation filtering.The variable interpolation filter group of this multiple can be made up of the one-level interpolation filter, also can be made up of multistage interpolation filter group, generally speaking, only needs to use 1～2 grade of interpolation filter to get final product.The interpolation of the variable interpolation filter group of process multiple and the I after the Filtering Processing, Q signal are input in I, the multistage modulation module of Q signal and go, through the multistage mixing and the modulation treatment of I, the multistage modulation module of Q signal, and output digital intermediate frequency I, Q signal at a high speed.I, the multistage modulation module of Q signal generally are made up of 1～2 grade of mixed modulated module, if in the follow-up DAC submodule, have the one-level mixed modulated and handle, and then I, the multistage modulation module of Q signal can omit the processing of one-level mixed modulated.Filter in the variable interpolation filter group of described multiple can be the filter of FIR, IIR, CIC, HB filter or other form.Described DAU/DRU broadband signal digital up-conversion module can utilize programmable logic devices such as CPLD, FPGA, EPLD, DSP to realize, also can use special-purpose asic chip to realize.

As shown in Figure 5, in this kind compound mode, the quantity of digital radio frequency far-pulling cells D RU is more than 1 or 1, and the quantity of digital access control cells D AU only is 1.The input of all digital radio frequency far-pulling cells D RU links to each other with the output of DAU respectively, and this compound mode can realize base station signal is covered in zones of different.Digital radio frequency far-pulling cells D RU function singleness in this star-like networking mainly as the end of overlay network, realizes the covering to digital access control cells D AU signal.

As shown in Figure 6, the quantity of numeral access control cells D AU is 1, the quantity of digital radio frequency far-pulling cells D RU is more than 1 or 1, and digital access control cells D AU and digital radio frequency far-pulling cells D RU#1 level chain, digital radio frequency far-pulling cells D RU#2 and digital radio frequency far-pulling cells D RU#1 level chain, and the like, the networking mode of formation daisy chain.Adopt the daisy chain networking mode, can realize covering the farther distance of base station signal.And digital radio frequency far-pulling cells D RU all can realize transmitting end or terminal function in the daisy chain, also is covering and the relaying translation function that digital radio frequency far-pulling cells D RU realizes signal.

As shown in Figure 7, in this kind compound mode, the quantity of digital access control cells D AU is 1, and the quantity of digital radio frequency far-pulling cells D RU is more than 1 or 1.The output of the input of digital radio frequency far-pulling cells D RU#1 and digital radio frequency far-pulling cells D RU#N (N 〉=1) all is connected with the output of digital access control cells D AU, simultaneously, digital radio frequency far-pulling cells D RU#1, digital radio frequency far-pulling cells D RU#2 ..., and digital radio frequency far-pulling cells D RU#N between connected in series mutually.In this annular networking mode, under the normal condition, data between numeral access control cells D AU and the digital radio frequency far-pulling cells D RU are always along clockwise direction or transmission counterclockwise, under the situation that connection is broken down, data can switch to the transmission of another one direction, do not interrupt for a long time to guarantee communication.Annular networking has the data link backup functionality, be daisy chain connect can't realize.

As shown in Figure 8, in this hybrid combining mode, digital access control cells D AU and digital radio frequency far-pulling cells D RU are a plurality of.Has multi-form networking mode in different sectors, as the DAU in the sector 1 and DRU#1, DRU#2 ..., DRU#N (N 〉=1) is the daisy chain networking mode, DAU in the sector 2 and DRU#1 ..., DRU#N (N 〉=1) is star-like networking mode, DAU in the sector 3 and DRU#1 ..., DRU#N (N 〉=1) is the annular networking mode, this multiple networking mode forms a comprehensive covering system, satisfies multiple application demand.

As mentioned above, just can realize the present invention preferably, the foregoing description is preferred embodiment of the present invention only, is not to be used for limiting practical range of the present invention; Be that all equalizations of doing according to content of the present invention change and modification, all contained by claim of the present invention scope required for protection.

Claims

1. wideband digital frequency-selecting radio frequency stretch system, comprise digital access control cells D AU and digital radio frequency far-pulling cells D RU, described digital access control cells D AU links to each other with digital radio frequency far-pulling cells D RU by optical fiber, it is characterized in that, described digital access control cells D AU comprises the DAU duplexer, DAU wideband digital down link, DAU opto-electronic conversion subsystem, DAU wideband digital up link, DAU power subsystem and DAU Monitor And Control Subsystem, described DAU duplexer links to each other with DAU wideband digital down link and DAU opto-electronic conversion subsystem successively, described DAU opto-electronic conversion subsystem links to each other with DAU wideband digital up link and DAU duplexer successively, described DAU power subsystem and DAU Monitor And Control Subsystem link to each other with DAU wideband digital up link and DAU wideband digital down link respectively, and described DAU duplexer also links to each other with the base station;

2. wideband digital frequency-selecting radio frequency stretch system according to claim 1, it is characterized in that, described DAU wideband digital down link comprises DAU radio frequency down-conversion subsystem, the DAU-ADC conversion processor, the descending open interface of DAU broadband signal digital down conversion module and DAU, the input of described DAU radio frequency down-conversion subsystem links to each other with the output of described DAU duplexer, the output of described DAU radio frequency down-conversion subsystem successively with the DAU-ADC conversion processor, the descending open interface of DAU broadband signal digital down conversion module and DAU links to each other, and the output of the descending open interface of described DAU links to each other with the input of DAU opto-electronic conversion subsystem; Described DAU wideband digital up link comprises the up open interface of DAU, DAU broadband signal digital up-conversion module, DAU-DAC conversion processor and DAU RF up-converter subsystem, the input of the up open interface of described DAU links to each other with the output of DAU opto-electronic conversion subsystem, the output of the up open interface of described DAU links to each other with DAU broadband signal digital up-conversion module, DAU-DAC conversion processor and DAU RF up-converter subsystem successively, and the output of described DAU RF up-converter subsystem links to each other with the input of DAU duplexer; Described DAU power subsystem and DAU Monitor And Control Subsystem link to each other with DAU radio frequency down-conversion subsystem, DAU-ADC conversion processor, DAU broadband signal digital down conversion module, the descending open interface of DAU, DAU RF up-converter subsystem, DAU-DAC conversion processor, DAU broadband signal digital up-conversion module and the up open interface of DAU respectively;

Described DRU wideband digital up link comprises the up open interface of DRU, DRU broadband signal digital up-conversion module, the DRU-DAC conversion processor, DRU RF up-converter subsystem and power amplifier, the input of the up open interface of described DRU links to each other with the output of described DRU opto-electronic conversion subsystem, the output of the up open interface of described DRU successively with DRU broadband signal digital up-conversion module, the DRU-DAC conversion processor, DRU RF up-converter subsystem and power amplifier link to each other, and the output of described power amplifier links to each other with the input of DRU duplexer; Described DRU wideband digital down link comprises low noise amplifier, DRU radio frequency down-conversion subsystem, the DRU-ADC conversion processor, the descending open interface of DRU broadband signal digital down conversion module and DRU, the input of described low noise amplifier links to each other with the output of DRU duplexer, the output of described low noise amplifier successively with DRU radio frequency down-conversion subsystem, the DRU-ADC conversion processor, the descending open interface of DRU broadband signal digital down conversion module and DRU links to each other, and the output of the descending open interface of described DRU links to each other with the input of DRU opto-electronic conversion subsystem; Described DRU Monitor And Control Subsystem and DRU power subsystem link to each other with the up open interface of DRU, DRU broadband signal digital up-conversion module, DRU-DAC conversion processor, DRU RF up-converter subsystem, power amplifier, the descending open interface of DRU, DRU broadband signal digital down conversion module, DRU-ADC conversion processor, DRU radio frequency down-conversion subsystem and low noise amplifier respectively.

3. wideband digital frequency-selecting radio frequency stretch system according to claim 1, it is characterized in that, described DAU wideband digital down link comprises DAU radio frequency down-conversion subsystem, DAU-ADC conversion processor, the descending open interface of DAU, the input of described DAU radio frequency down-conversion subsystem links to each other with the output of described DAU duplexer, the output of described DAU radio frequency down-conversion subsystem links to each other with DAU-ADC conversion processor and the descending open interface of DAU successively, and the output of the descending open interface of described DAU links to each other with the input of described DAU opto-electronic conversion subsystem; Described DAU wideband digital up link comprises the up open interface of DAU, DAU broadband signal digital down conversion module, DAU broadband signal digital up-conversion module, DAU-DAC conversion processor and DAU RF up-converter subsystem, the input of the up open interface of described DAU links to each other with the output of DAU opto-electronic conversion subsystem, the output of the up open interface of described DAU successively with DAU broadband signal digital down conversion module, DAU broadband signal digital up-conversion module, DAU-DAC conversion processor and DAU RF up-converter subsystem link to each other, and the output of described DAU RF up-converter subsystem links to each other with the input of DAU duplexer; Described DAU power subsystem and DAU Monitor And Control Subsystem link to each other with DAU radio frequency down-conversion subsystem, DAU-ADC conversion processor, the descending open interface of DAU, DAU RF up-converter subsystem, DAU-DAC conversion processor, DAU broadband signal digital up-conversion module, DAU broadband signal digital down conversion module and the up open interface of DAU respectively;

Described DRU wideband digital up link comprises the up open interface of DRU, DRU broadband signal digital down conversion module, DRU broadband signal digital up-conversion module, the DRU-DAC conversion processor, DRU RF up-converter subsystem and power amplifier, the input of the up open interface of described DRU links to each other with the output of described DRU opto-electronic conversion subsystem, the output of the up open interface of described DRU successively with DRU broadband signal digital down conversion module, DRU broadband signal digital up-conversion module, the DRU-DAC conversion processor, DRU RF up-converter subsystem and power amplifier link to each other, and the output of described power amplifier links to each other with the input of described DRU duplexer; Described DRU wideband digital down link comprises low noise amplifier, DRU radio frequency down-conversion subsystem, DRU-ADC conversion processor, the descending open interface of DRU, the input of described low noise amplifier links to each other with the output of DRU duplexer, the output of described low noise amplifier links to each other with DRU radio frequency down-conversion subsystem, DRU-ADC conversion processor and the descending open interface of DRU successively, and the output of the descending open interface of described DRU links to each other with the input of described DRU opto-electronic conversion subsystem; Described DRU Monitor And Control Subsystem and DRU power subsystem link to each other with the up open interface of DRU, DRU broadband signal digital down conversion module, DRU broadband signal digital up-conversion module, DRU-DAC conversion processor, DRU RF up-converter subsystem, power amplifier, the descending open interface of DRU, DRU-ADC conversion processor, DRU radio frequency down-conversion subsystem and low noise amplifier respectively.

4. according to claim 2 or 3 described wideband digital frequency-selecting radio frequency stretch systems, it is characterized in that described DAU broadband signal digital down conversion module and DRU broadband signal digital down conversion module include frequency mixing module, digital controlled oscillator NCO generation module, Digital Down Convert processing DDC self-adaptive decision device, multiple variable extraction filter and base band formed filter; The output of described digital controlled oscillator NCO generation module links to each other with the input of frequency mixing module; The output of described frequency mixing module is handled DDC self-adaptive decision device, multiple variable extraction filter and base band formed filter with Digital Down Convert successively and is linked to each other;

Described DAU broadband signal digital up-conversion module and DRU broadband signal digital up-conversion module include Digital Up Convert and handle DUC self-adaptive decision device, the variable interpolation filter group of multiple and I, the multistage modulation module of Q signal; The output that DUC self-adaptive decision device is handled in described Digital Up Convert links to each other with the variable interpolation filter group of multiple and I, the multistage modulation module of Q signal successively.

5. adopt the processing method of the wideband digital signal of the described wideband digital frequency-selecting radio frequency stretch system realization of claim 2, may further comprise the steps:

(1) the DAU duplexer radiofrequency signal that is coupled from the base station, and process DAU duplexer carries out passing through DAU radio frequency down-conversion subsystem after the Filtering Processing, filtered radiofrequency signal is downconverted to analog intermediate frequency signal, through the DAU-ADC conversion processor analog intermediate frequency signal is converted to the high-speed figure intermediate-freuqncy signal again;

(3) low speed baseband I, Q signal are through the descending open interface of DAU, and carry out framing according to the framing agreement that CPRI, OBASI framing common protocol or businessman self formulate and handle, and the digital signal that framing obtains later on is sent to DAU opto-electronic conversion subsystem changes the generation digital optical signal, by optical fiber this digital optical signal is transferred in the DRU opto-electronic conversion subsystem again;

(4) DRU opto-electronic conversion subsystem is converted to digital signal with the digital optical signal of input, and the framing agreement of formulating according to CPRI, OBASI framing common protocol or businessman self in the up open interface of DRU is separated the frame processing, and the digital signal that obtains is passed through DRU broadband signal digital up-conversion module carry out interpolation, filtering and Frequency mixing processing, generate digital medium-frequency signal at a high speed;

(8) low speed baseband I, Q signal are in the descending open interface of DRU, carry out the framing processing of data according to the framing agreement that CPRI, OBASI framing common protocol or businessman self formulate, and the digital signal that framing is good is sent to DRU opto-electronic conversion subsystem and handles, and obtains digital optical signal;

(9) digital optical signal of exporting from DRU opto-electronic conversion subsystem passes through the processing of DAU opto-electronic conversion subsystem, the framing agreement that generates digital signal and formulate according to CPRI, OBASI framing common protocol or businessman self in the up open interface of DAU is carried out the frame of separating of data and is handled, and will separate digital signal that frame obtains later on and be input to DAU broadband signal digital up-conversion module and carry out interpolation, filtering and Frequency mixing processing, generate the high-speed figure intermediate-freuqncy signal;

6. adopt the processing method of the wideband digital signal of the described wideband digital frequency-selecting radio frequency stretch system realization of claim 3, may further comprise the steps:

(1) the DAU duplexer radiofrequency signal that is coupled from the base station, carry out passing through DAU radio frequency down-conversion subsystem after the Filtering Processing through the DAU duplexer, filtered radiofrequency signal is downconverted to intermediate-freuqncy signal, through the DAU-ADC conversion processor intermediate-freuqncy signal is converted to the high-speed figure intermediate-freuqncy signal again;

(2) the high-speed figure intermediate-freuqncy signal is carried out the framing processing according to the framing agreement of CPRI, OBASI framing common protocol or businessman self formulation in the descending open interface of DAU, and the digital signal that framing is later is sent to DAU opto-electronic conversion subsystem and is converted to digital optical signal, by optical fiber this digital optical signal is transferred in the DRU opto-electronic conversion subsystem again;

(3) DRU opto-electronic conversion subsystem is converted to digital signal with the digital optical signal of input, and the framing agreement of formulating according to CPRI, OBASI framing common protocol or businessman self in the up open interface of DRU is separated the frame processing, and the digital signal that obtains carried out mixing, data pick-up and Filtering Processing through DRU broadband signal digital down conversion module, obtain baseband I, Q signal behind the molding filtration;

(6) analog if signal is through the conversion of DRU-ADC conversion processor, obtain the high-speed figure intermediate-freuqncy signal, and this high-speed figure intermediate-freuqncy signal is input in the descending open interface of DRU, carry out the framing processing of data according to the framing agreement that CPRI, OBASI framing common protocol or businessman self formulate, and the digital signal that framing is good is sent to DRU opto-electronic conversion subsystem and handles, and obtains digital optical signal;

(7) handle through DAU opto-electronic conversion subsystem from the digital optical signal of DRU opto-electronic conversion subsystem output, obtain digital signal and pass through the up open interface of DAU, the framing agreement of formulating according to CPRI, OBASI framing common protocol or businessman self is carried out the frame of separating of data and is handled, and will separate the digital signal that frame obtains later on and be input to DAU broadband signal digital down conversion module;