CN101453799B - Multi-carrier digital frequency-selective radio remote system and its signal processing method - Google Patents
Multi-carrier digital frequency-selective radio remote system and its signal processing methodDownload PDFInfo
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- CN101453799B CN101453799BCN200710031850ACN200710031850ACN101453799BCN 101453799 BCN101453799 BCN 101453799BCN 200710031850 ACN200710031850 ACN 200710031850ACN 200710031850 ACN200710031850 ACN 200710031850ACN 101453799 BCN101453799 BCN 101453799B
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Abstract
Translated fromChinese
Description
Technical field
The present invention relates to the covering system of moving communicating field, specifically be meant a kind of multi-carrier digital frequency-selection radio frequency pulling 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 performances such as multicarrier, mixed networking and remote Optical Fiber Transmission.
Multicarrier analog optical fiber direct discharging station is widely used a kind of form in the present actual engineering, it mainly is to expand on single carrier analog optical fiber direct discharging station, compose in parallel multicarrier frequency-selecting module by a plurality of SAW (Surface Acoustic Wave) filter SAW, thereby realize the filtering frequency-selecting of multi-carrier signal is handled.But such extended mode will cause occurring following problem: a plurality of SAW (Surface Acoustic Wave) filter SAW parallel connections of (1) needs, because SAW (Surface Acoustic Wave) filter SAW is an analogue device, the consistency of performance is bad, and 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, carrier wave of every increase or channel just need the SAW (Surface Acoustic Wave) filter SAW of interpolation more, need to change the layout of whole system, and increase 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, the frequency-selecting that all can have influence on other carrier waves is handled, thereby causes the machine system decreased performance.Therefore, this traditional analog optical fiber repeater can not well realize big dynamically, the requirement on the performances such as multicarrier, 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 multi-carrier digital frequency-selection radio frequency pulling system is provided, this system replaces SAW (Surface Acoustic Wave) filter SAW with the Digital IF Processing technology in the software radio, this system can kept under the constant situation of hardware platform, reduce the use of analogue device, and can when arbitrarily increasing and decreasing carrier number, guarantee that systematic function has good consistency.
The present invention also aims to provide a kind of signal processing method of multi-carrier digital frequency-selection radio frequency pulling system.
Purpose of the present invention is achieved through the following technical solutions: multi-carrier digital frequency-selection radio frequency pulling 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 digital radio frequency far-pulling cells D RU by optical fiber, described digital access control cells D AU comprises the DAU duplexer, the DAU down link, DAU opto-electronic conversion subsystem, the DAU up link, DAU power subsystem and DAU Monitor And Control Subsystem, described DAU duplexer links to each other with DAU down link and DAU opto-electronic conversion subsystem successively, described DAU opto-electronic conversion subsystem links to each other with DAU up link and DAU duplexer successively, described DAU power subsystem and DAU Monitor And Control Subsystem link to each other with DAU up link and DAU 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 up link, DRU duplexer, DRU down link, DRU Monitor And Control Subsystem and DRU power subsystem, described DRU opto-electronic conversion subsystem links to each other with DRU up link and DRU duplexer successively, described DRU duplexer links to each other with DRU 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 up link and DRU down link respectively, and described DRU duplexer also links to each other with covering/reception antenna.
For realizing the present invention better, described DAU down link comprises DAU radio frequency down-conversion subsystem, DAU-ADC conversion processor, DAU multi-carrier 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 multi-carrier 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 up link comprises the up open interface of DAU, DAU multi-carrier 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 multi-carrier 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 multi-carrier digital down conversion module, the descending open interface of DAU, DAU RF up-converter subsystem, DAU-DAC conversion processor, DAU multi-carrier digital up-conversion module and the up open interface of DAU respectively.
Described DRU up link comprises the up open interface of DRU, DRU multi-carrier 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 multi-carrier 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 down link comprises low noise amplifier, DRU radio frequency down-conversion subsystem, DRU-ADC conversion processor, DRU multi-carrier digital down conversion module and 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, DRU multi-carrier digital down conversion module 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 multi-carrier digital up-conversion module, DRU-DAC conversion processor, DRU RF up-converter subsystem, power amplifier, the descending open interface of DRU, DRU multi-carrier 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 multiple carrier 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 enters DAU multi-carrier digital down conversion module, multi-carrier signal is separated, and multi-carrier signal is carried out mixing, extraction and Filtering Processing, low speed multicarrier baseband I, Q signal after output is handled through molding filtration;
(3) low speed multicarrier 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 electric 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 electric 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 electric signal that obtains is passed through DRU multi-carrier 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 multi-carrier digital down conversion module again and carries out the separation of multi-carrier signal, and multi-carrier signal carried out mixing, extraction and Filtering Processing, low speed multicarrier baseband I, Q signal after output is handled through molding filtration;
(8) low speed multicarrier 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 electric 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 electric 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 electric signal that frame obtains later on and be input to DAU multi-carrier 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 low speed baseband I, the Q data after will handling through Digital Down Convert DDC to carry out framing and handles, and 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 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 up link comprises the up open interface of DAU, DAU multi-carrier digital down conversion module, DAU multi-carrier 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, 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 multi-carrier digital up-conversion module, DAU multi-carrier digital down conversion module and the up open interface of DAU respectively.
Described DRU up link comprises the up open interface of DRU, DRU multi-carrier digital down conversion module, DRU multi-carrier 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 multi-carrier digital down conversion module, DRU multi-carrier 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 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 multi-carrier digital down conversion module, DRU multi-carrier 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 multiple carrier 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 electric 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 electric 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 electric signal that obtains carried out mixing, data pick-up and Filtering Processing through DRU multi-carrier digital down conversion module, obtain multicarrier baseband I, Q signal behind the molding filtration;
(4) multicarrier baseband I, Q signal carry out interpolation, filtering and Frequency mixing processing through DRU multi-carrier 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 electric 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 electric 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 electric signal that frame obtains later on and be input to DAU multi-carrier 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 multi-carrier digital down conversion module, obtain multicarrier baseband I, Q signal behind the molding filtration, and this multicarrier baseband I, Q signal are input to DAU multi-carrier digital up-conversion module;
(9) interpolation, filtering and the Frequency mixing processing of process DAU multi-carrier 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.
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 multi-carrier signal;
(2) based on software radio thought, adopt extraction, interpolation, mixing and the Filtering Processing of digital if technology realization to multi-carrier 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) can keep arbitrarily to increase and decrease carrier number as requested under the constant situation of hardware platform, simultaneously, only need the software in the modification system, just can accomplish the compatible multicarrier radio frequency stretch system of standard arbitrarily fully, system has good applicability and extensibility;
(6) be easy to realize the miniaturization and the microminiaturization of multi-carrier digital frequency-selection radio frequency pulling system.
Description of drawings
Fig. 1 is a 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 multi-carrier digital down-conversion subsystem schematic diagram of the present invention;
Fig. 4 is a DAU/DRU multi-carrier digital up-conversion subsystem schematic 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. 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, multi-carrier digital frequency-selection radio frequency pulling system is connected to form by optical fiber and digital radio frequency far-pulling cells D RU by digital access control cells D AU.An input and the output of DAU duplexer among the numeral access control cells D AU all link to each other with the base station.Wherein, the input that links to each other with the base station is used to the radiofrequency signal of base station that is coupled, and is transferred to the DAU duplexer; The output 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 DAU down link is connected to form successively by DAU radio frequency down-conversion subsystem, DAU-ADC conversion processor, DAU multi-carrier 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.The DAU up link is connected to form successively by the up open interface of DAU, DAU multi-carrier 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 multi-carrier digital down conversion module, DAU multi-carrier 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.
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.
The DRU up link is connected to form successively by the up open interface of DRU, DRU multi-carrier 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 the digital signal of reception DRU opto-electronic conversion subsystem output, the digital signal of the output of power amplifier and the output of DRU duplexer DRU opto-electronic conversion subsystem, the output of power amplifier links to each other with the input of DRU duplexer.
The DRU down link is connected to form successively by low noise amplifier, DRU radio frequency down-conversion subsystem, DRU-ADC conversion processor, DRU multi-carrier 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 multi-carrier digital up-conversion module, DRU-DAC conversion processor, DRU RF up-converter subsystem, power amplifier, the descending open interface of DRU, DRU multi-carrier 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 the separation of multi-carrier signal through DAU multi-carrier digital down conversion module again, and realization is exported through low speed multicarrier baseband I, Q signal after the molding filtration processing mixing, extraction and the Filtering Processing of multi-carrier signal; The multicarrier 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 Base Station Architecture Initiative base station common architecture agreement) and radio frequency stretch system businessman self formulate, with this low speed multicarrier baseband I, Q signal carries out framing and handles the generation digital electric signal, and this digital electric 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 electric signal, and the digital electric 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 electric signal of input is carried out the frame of separating of data and handle, and will separate the digital electric signal that obtains behind the frame and be transferred to DRU multi-carrier digital up-conversion module; DRU multi-carrier 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 the separation of carrying out multi-carrier signal in the DRU multi-carrier digital down conversion module, and realization is to mixing, extraction and the Filtering Processing of multi-carrier signal, export through low speed multicarrier 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 electric signal; The digital electric 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 electric 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 electric signal is separated frame handle, the digital electric signal that will separate again behind the frame is input to DAU multi-carrier digital up-conversion module; The digital electric signal that generates is process interpolation, filtering and Frequency mixing processing in DAU multi-carrier 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 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 2, the structure basically identical of the structure of this system and the described system of Fig. 1, difference only is the difference of composition separately of DAU down link, DAU up link, DRU up link and DRU down link.As shown in Figure 2, this DAU 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.The DAU up link is connected to form successively by the up open interface of DAU, DAU multi-carrier digital down conversion module, DAU multi-carrier 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 multi-carrier digital down conversion module, DAU multi-carrier 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.
The DRU up link is connected to form successively by the up open interface of DRU, DRU multi-carrier digital down conversion module, DRU multi-carrier 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.
The DRU 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 multi-carrier digital down conversion module, DRU multi-carrier 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 electric 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 electric signal with this digital optical signal after receiving the digital optical signal of input, and the digital electric 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 electric signal of importing 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 multi-carrier digital down conversion module; DRU multi-carrier digital down conversion module is carried out mixing, data pick-up and Filtering Processing to the digital signal of input, forms through multicarrier baseband I, Q signal behind the molding filtration, and I, the Q signal that forms is input to DRU multi-carrier digital up-conversion module; DRU multi-carrier 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 electric signal; The digital electric 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 electric 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 electric signal that will separate again behind the frame is input to DAU multi-carrier digital down conversion module; DAU multi-carrier digital down conversion module is carried out mixing, data pick-up and Filtering Processing with the digital electric signal of input, forms through multicarrier baseband I, Q signal behind the molding filtration, and I, the Q signal that forms is input to DAU multi-carrier digital up-conversion module; DAU multi-carrier 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 multi-carrier digital down conversion module is duplicate with the operation principle of DRU multi-carrier digital down conversion module, and what its received is the high-speed figure intermediate-freuqncy signal, output be digital baseband I, Q signal.DAU/DRU multi-carrier digital down conversion module is made up of 1 digital controlled oscillator and a plurality of filtering extraction module, the number of filtering extraction module is mainly by the treatable carrier number decision of digital RF far-drawing system institute, as 10 carrier wave digital RF far-drawing systems, then need the filtering extraction module of 10 I signals and the filtering extraction module of 10 Q signals to form.This multi-carrier digital down conversion module has favorable expansibility and adaptability, and the filtering extraction number of modules can be expanded arbitrarily and deletes according to system requirements.Described filtering extraction module is made up of D haplotype data abstraction module and the anti-filtration module that mixes repeatedly, the output of described D haplotype data abstraction module links to each other with the anti-input that mixes the filtration module that changes, and the value of the D in the D haplotype data abstraction module is 4,8,16,32 etc., simultaneously, extracting multiple can be revised arbitrarily and select with practical application request.The input of digital controlled oscillator is used to receive digital medium-frequency signal, and output is connected with the input of a plurality of D haplotype data abstraction modules respectively.
The input of the digital controlled oscillator in the DAU multi-carrier 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 multi-carrier 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, the sin of Q signal and NCO output and the cos processing of multiplying each other, finish the mixing function, through I, the separation conversion process of Q signal, realization is to multicarrier I, the separation of Q signal, output multicarrier I, Q signal, the I on every road, Q signal passes through D haplotype data abstraction module more respectively, obtain through extracting the low speed I after handling, the Q data, I after the extraction, the Q data are carried out Filtering Processing through the anti-filtration module that changes that mixes again, the mixed repeatedly signal that filtering causes because of extraction, the output multicarrier is through mixing, extract and filtered low speed baseband I, Q signal.Described DAU multi-carrier 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 multi-carrier digital up-conversion module is duplicate with the operation principle of DAU multi-carrier digital up-conversion module, reception be digital baseband I, Q signal, output high-speed figure intermediate-freuqncy signal.DAU/DRU multi-carrier digital up-conversion module is made up of 1 digital controlled oscillator and a plurality of interpolation filtering module, the number of interpolation filtering module is mainly by the treatable carrier number decision of digital RF far-drawing system institute, as 10 carrier wave digital RF far-drawing systems, then need the interpolation filtering module of 10 I signals and the interpolation filtering module of 10 Q signals to form.This multi-carrier digital up-conversion module has favorable expansibility and adaptability, and the interpolation filtering number of modules can be expanded arbitrarily and deletes according to system requirements.Described interpolation filtering module comprises that I haplotype data interpose module and mirror image suppress filtration module, the output of described I haplotype data interpose module suppresses filtration module by mirror image and is connected with the input of digital controlled oscillator, and the value of described I is 4,8,16,32 etc., simultaneously, the interpolation multiple can be revised arbitrarily and select with practical application request.DAU multi-carrier digital up-conversion module receives multicarrier baseband I, the Q signal from DAU multi-carrier digital down conversion module, carrying out interpolation of data through I haplotype data interpose module handles, output is through I, Q data after the interpolation, suppress filtration module through the I after the interpolation, Q signal input mirror picture, the inhibition of the image signal of realization after to interpolation is handled, and exports filtered I, Q signal.At last,, finish Frequency mixing processing, export High Speed I, Q signal after the up-conversion with processings of multiplying each other of the quadrature cos of digital controlled oscillator output and sin signal.
Described DAU/DRU multi-carrier 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 cellsD RU# 1 level chain, digital radio frequency far-pulling cellsD RU# 2 and digital radio frequency far-pulling cellsD 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 cellsD 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 cellsD RU# 1, digital radio frequency far-pulling cellsD 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 thesector 1 andDRU# 1,DRU# 2 ..., DRU#N (N 〉=1) is the daisy chain networking mode, DAU in thesector 2 andDRU# 1 ..., DRU#N (N 〉=1) is star-like networking mode, DAU in thesector 3 andDRU# 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.
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