CN1801673A - Mobile communication repeater system applying digital intermediate frequency mode - Google Patents
Mobile communication repeater system applying digital intermediate frequency mode Download PDFInfo
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- CN1801673A CN1801673A CN 200610001047 CN200610001047A CN1801673A CN 1801673 A CN1801673 A CN 1801673A CN 200610001047 CN200610001047 CN 200610001047 CN 200610001047 A CN200610001047 A CN 200610001047A CN 1801673 A CN1801673 A CN 1801673A
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Abstract
The invention discloses a mobile communication direct amplifying station with digital intermediate frequency. Wherein, transforming the down signal into analog intermediate frequency signal with RF module to send to ADC/DAC group and transform into digital intermediate frequency signal by A/D; extracting and filtering with digital down converter, and secondary transforming into baseband signal to send to baseband treatment unit for packaging into serial data as given frame format; transferring with optical fiber to high-speed digital optical fiber transceiver on cover end to de-frame with baseband treatment unit and send into ADC/DAC group; filtering and interpolating with digital up converter, transforming into analog intermediate frequency signal by D/A converter; finally, taking frequency conversion with RF module into RF signal and sending to opposite over area. The remote machine sends received up signal of mobile terminal with said inverse process to receiving end of base station. This invention avoids intrinsic leakage and dc offset in prior art.
Description
Affiliated technical field
The present invention relates to a kind of Mobile communication direct base station series that adopts new signal processing mode, be specifically related to a kind of mobile communication digital optical fibre repeater system that adopts digital intermediate frequency mode.
Background technology
Mobile communication direct base station has important status in the network optimization of mobile communication system and signal cover, the digital high-frequency amplification station technology also causes increasing attention, if but still carry out frequency translation in the simulation part, system uses analogue device then to be difficult to reach fully the balance of I/Q amplitude and phase place in a large number, thereby influences the performance of system.In addition, the present Communications Market one side multiple standard of second generation mobile communication system is also deposited, and still playing a significant role; New standard constantly is formulated on the other hand, but can not replace existing standard fully.Its existing system, standard is numerous, the coexistence of the new and old structures, and development communication technologies is maked rapid progress, new standard and standard continue to bring out again, and the new business that new standard provides had both had huge attraction, had caused very big pressure also for user and operator.The direct discharging station of traditional approach is difficult to adapt to present mobile communication system covers the field at the network optimization and signal many demands owing to be subjected to the restriction of technical system.
Summary of the invention
In order to solve the existing above-mentioned technical problem of traditional approach direct discharging station, and the Communications Market present situation that adapts to present multiple system and deposit, the invention discloses a kind of mobile communication digital optical fibre repeater system that adopts digital intermediate frequency mode.The software that this system's utilization operates on the general hardware platform is realized radio communication function, give full play to the flexibility of software, realize different communication standards by reconfiguring of software, make wireless system finally break away from the constraint of hardware, have very high technological value.Be two thoughts more than the specific implementation, the present invention realizes digitlization at intermediate-frequency section, promotes the performance index of whole direct discharging station, and makes the function of radio system define and realize with software as much as possible.
Native system adopts the CPRI interface system, can handle signals such as GSM/CDMA/WCDMA/cdma2000, is common to the 2G/3G system.CPRI (The Common Public Radio Interface) has defined the interface relationship between base station data processing and control element (PCE) REC (Radio Equipment Control) and the base station transceiver unit R E (Radio Equipment).Its data structure can directly apply in the repeater, realizes the long-distance transmissions to data-signal.
The present invention is made up of relay 101 and capped end 102, finishes the signal transmission by optical fiber 103 between its relay 101 and the capped end 102.Mobile communication downlink radiofrequency signal from the base station is admitted to RF module 204, through after the analog down it is transformed to analog if signal, this analog if signal is admitted to A/D converter spare 205, after analog if signal is transformed to digital medium-frequency signal, sending into programmable digital down converter DDC206 again extracts, processing such as filtering, finish frequency translation for the second time, make the carrier frequency of digital medium-frequency signal further reduce also and then become baseband signal, this baseband signal is admitted to baseband processing module 207, by baseband processing module 207 and then by 8B/10B conversion module 208 it is packaged into the data that are fit to the CPRI frame format, these data by optical transceiver 209 and by optical fiber 210 by away from being transferred to capped end; At capped end, at first signal is sent into the 8B/10B conversion module 218 of capped end then by baseband processing module 219 by optical transceiver 216, send into programmable digital upconverter DUC222 after signal separated frame, baseband signal is converted to digital intermediate frequency signal by frequency up-conversion operation such as filtering, interpolation, carry out conversion and digital intermediate frequency signal be converted to analog intermediate frequency signal by D/A transformation device 220 again through The disposal of gentle filter, after RF module 224 deliver to antenna 225 and be transmitted into corresponding overlay area after analog intermediate frequency signal is transformed to radiofrequency signal; The course of work of its upward signal is the inverse process of the above-mentioned downstream signal course of work.
Wherein, described RF module 204 and 224 is carried out the single-conversion processing, finishes radiofrequency signal arrives radiofrequency signal to analog if signal and analog if signal conversion; Frequency converter module DDC223 among the inverse process of described frequency converter module DDC206 and DUC222 and the above-mentioned downstream signal course of work and DUC212 carry out double conversion to be handled, and finishes digital medium-frequency signal arrives digital medium-frequency signal to baseband signal and baseband signal conversion; Its mode can be selected as required flexibly, comprising: can all comprise DDC module and DUC module in relay and capped end; Also can only comprise DDC module and DUC module at capped end in the relay or only; Perhaps only comprise DDC module and DUC module at down direction or up direction; A/D transformation device 227 among the inverse process of the described A/D transformation device 205 and the above-mentioned downstream signal course of work carries out the processing procedure of analog to digital, finishes the conversion of analog if signal to digital medium-frequency signal; D/A transformation device 213 among the inverse process of the described D/A transformation device 220 and the above-mentioned downstream signal course of work carries out the processing procedure of digital to analogy, finishes the conversion of digital medium-frequency signal to analog if signal.In described digital intermediate frequency mode, by adopting software and radio technique, intermediate-frequency section is being realized the digitized while, by carrying out corresponding software arrangements, thereby signal processing and distant signal transmission under various modes and the multiple standards are provided simultaneously, and all various wireless services existing and tomorrow requirement are provided.
The frequency range of the downstream signal that launch described base station can be: 869～894MHz of CDMA IS-95 system, 920～960MHz of gsm system, 1805～1880MHz of GSM1800 system, 1920～1990MHz of cdma2000,2110～2170MHz of WCDMA system; The frequency range of the upward signal that described remote termination received can be: 824～849MHz of CDMA IS-95 system, 885～915MHz of gsm system, 1710～1785MHz of GSM1800 system, 1850～1910MHz of cdma2000,1920～1970MHz of WCDMA system.The digital fiber transceiver of described near-end repeater and remote termination and the serial data rate on the up-downgoing optical fiber link can be: 614.4Mbps, and 1228.8Mbps, 2457.6Mbps can select according to different practical applications.
According to the description of this paper, can make many further modifications to the present invention, also can do many variations according to actual needs.Therefore, in additional claim scope, the present invention can adopt various implementation to specifically described embodiment.
The present invention has avoided the local-oscillator leakage of the Mobile communication direct base station under the traditional approach, the puzzlement of technology such as direct current biasing, be specially adapted to the long-distance transmissions of multicarrier repeater baseband signal, for mobile communication system has increased a kind of brand-new distant signal transmission and signal covering system.
Brief Description Of Drawings
Figure 1 shows that system's pie graph of the Mobile communication direct base station of employing digital intermediate frequency mode provided by the present invention;
Figure 2 shows that the communication repeater system The general frame of employing digital intermediate frequency mode provided by the present invention;
Fig. 3 a is depicted as system's composition diagram of near-end repeater subsystem provided by the present invention;
Fig. 3 b is depicted as far-end mulch-laying machine subsystem composition diagram provided by the present invention.
Its description of reference numerals is as follows:
101: the relaying terminal; 102: far-end covers terminal; 103,210,215: optical fiber; 202: coupler; 203: duplexer; 204,224:RF module; 201: the base station main antenna; 214: antenna is assisted in the base station; 205,227:A/D converter; 207,219: baseband processing unit; 212,222:DUC; 206,223:DDC; 209,216: optical transceiver; 208,218:8B/10B conversion; 213,220:D/A converter; 211,221: synchronous circuit; 225,226: the capped end antenna.
Embodiment
Specifically describe corresponding to the preferred embodiments of the present invention below in conjunction with accompanying drawing:
1, Figure 1 shows that system's pie graph of the Mobile communication direct base station of employing digital intermediate frequency mode provided by the present invention.As shown in the figure, the downstream signal of its base station is sent into the ADC/DAC group after the RF module is transformed to analog if signal, be transformed to digital medium-frequency signal and extract through A/D by digital down converter, quadratic transformation is a baseband signal after the filtering, be sent to baseband processing unit then and be packaged into serial data by certain frame format, again through the high-speed figure fiber optical transceiver by the optical fiber long-distance transmissions to capped end high-speed figure fiber optical transceiver, separate by baseband processing unit and to send into the ADC/DAC group behind the frame, carry out filtering by digital up converter, interpolation is after the D/A converter becomes analog if signal, after the frequency conversion of RF module be radiofrequency signal and be transmitted into the respective coverage areas territory.Its remote termination with the portable terminal upward signal that receives by above-mentioned inverse process, on deliver to the base station receiving terminal.
2, Figure 2 shows that the communication repeater system The general frame of employing digital intermediate frequency mode provided by the present invention.As shown in the figure, the present invention is made up of relay 101 and capped end 102.Wherein, the transmission of the signal between relay and the capped end is finished by optical fiber 103.
3, referring to system's composition diagram of the near-end repeater subsystem shown in Fig. 3 a.
The down link course of work of this subsystem is: as shown in the figure, near-end repeater subsystem, mobile communication downlink radiofrequency signal from the base station is admitted to RF module 204, through after the analog down it is transformed to analog if signal, this analog if signal is admitted to A/D converter spare 205, after analog if signal is transformed to digital medium-frequency signal, sending into programmable digital down converter DDC206 again extracts, processing such as filtering, finish frequency translation for the second time, make the carrier frequency of digital medium-frequency signal further reduce also and then become baseband signal, this baseband signal is admitted to baseband processing module 207, by baseband processing module 207 and then by 8B/10B conversion module 208 it is packaged into the data that are fit to the CPRI frame format, these data arrive capped end by optical transceiver 209 and by optical fiber 210 long-distance transmissions; The course of work of its upward signal is the inverse process of the above-mentioned downstream signal course of work.
4, cover system's composition diagram of terminal subsystem referring to the far-end shown in Fig. 3 b.
The down link course of work of this subsystem is: as shown in the figure, covering the terminal subsystem, at first receive the digital signal that the relay is sent here by optical transceiver 216, after separating frame by 219 pairs of signals of baseband processing module then, the 8B/10B conversion module 218 of then it being sent into capped end sends into programmable digital upconverter DUC222, with baseband signal by filtering, frequency up-conversion operation such as interpolation are converted to digital intermediate frequency signal, carry out conversion and digital intermediate frequency signal be converted to analog intermediate frequency signal by D/A transformation device 220 again through The disposal of gentle filter, after RF module 224 deliver to antenna 225 and be transmitted into corresponding overlay area after analog intermediate frequency signal is transformed to radiofrequency signal; The course of work of its upward signal is the inverse process of the above-mentioned downstream signal course of work.
As mentioned above, although represented and described and implemented technical scheme of the present invention with reference to specific preferred embodiment, but it can not be interpreted as the restriction to the present invention self, those skilled in the art can understand, in not breaking away from described claim, under the prerequisite of defined the spirit and scope of the present invention, can make various variations in the form and details to it.Appending claims has covered all such changes and modifications in the spirit and scope of the present invention.
Claims (6)
1, a kind of communication repeater system that adopts digital intermediate frequency mode is made up of relay (101) and capped end (102), finishes the signal transmission by optical fiber (103) between its relay (101) and the capped end (102); It is characterized in that: the mobile communication downlink radiofrequency signal from the base station is admitted to RF module (204), through after the analog down it is transformed to analog if signal, this analog if signal is admitted to A/D converter spare (205), analog if signal is transformed to digital medium-frequency signal, sending into programmable digital down converter DDC (206) then extracts, Filtering Processing, finish frequency translation for the second time, make the carrier frequency of digital medium-frequency signal further reduce also and then become baseband signal, this baseband signal is admitted to baseband processing module (207), by baseband processing module (207) and then by 8B/10B conversion module (208) it is packaged into the data that are fit to the CPRI frame format, these data arrive capped end by optical transceiver (209) and by optical fiber (210) long-distance transmissions; At capped end, send into programmable digital upconverter DUC (222) after at first the 8B/10B conversion module (218) of signal being sent into capped end by optical transceiver (216) is separated frame by baseband processing module (219) to signal then, with baseband signal by filtering, frequency up-conversion operation such as interpolation are converted to digital intermediate frequency signal, carry out conversion and after The disposal of gentle filter, digital intermediate frequency signal be converted to analog intermediate frequency signal by D/A transformation device (220) again, after RF module (224) deliver to antenna (225) and be transmitted into corresponding overlay area after analog intermediate frequency signal is transformed to radiofrequency signal; The course of work of its upward signal is the inverse process of the above-mentioned downstream signal course of work.
2, the communication repeater system of employing digital intermediate frequency mode according to claim 1, it is characterized in that, the single-conversion processing is carried out in described RF module (204) and (224), finishes radiofrequency signal arrives radiofrequency signal to analog if signal and analog if signal conversion.
3, the communication repeater system of employing digital intermediate frequency mode according to claim 1, it is characterized in that, frequency converter module DDC (223) among the inverse process of described frequency converter module DDC (206) and the DUC (222) and the described downstream signal course of work and DUC (212) carry out double conversion to be handled, and finishes digital medium-frequency signal arrives digital medium-frequency signal to baseband signal and baseband signal conversion; Its mode can be selected as required flexibly, comprising: can all comprise DDC module and DUC module in relay and capped end; Also can only comprise DDC module and DUC module at capped end in the relay or only; Perhaps only comprise DDC module and DUC module at down direction or up direction.
4, the communication repeater system of employing digital intermediate frequency mode according to claim 1, it is characterized in that, A/D transformation device (227) among the inverse process of the described A/D transformation device (205) and the described downstream signal course of work carries out the processing procedure of analog to digital, finishes the conversion of analog if signal to digital medium-frequency signal.
5, the communication repeater system of employing digital intermediate frequency mode according to claim 1, it is characterized in that, D/A transformation device (213) among the inverse process of the described D/A transformation device (220) and the described downstream signal course of work carries out the processing procedure of digital to analogy, finishes the conversion of digital medium-frequency signal to analog if signal.
6, the communication repeater system of employing digital intermediate frequency mode according to claim 1, it is characterized in that, in described digital intermediate frequency mode, by adopting software and radio technique, intermediate-frequency section is being realized the digitized while, by carrying out corresponding software arrangements, thereby provide signal processing and distant signal transmission under various modes and the multiple standards simultaneously, and all various wireless services existing and tomorrow requirement are provided.
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| CN101796751A (en) * | 2007-09-04 | 2010-08-04 | 西门子公司 | Apparatus for transmitting data between two systems which move relative to one another |
| CN101815054A (en) * | 2010-04-06 | 2010-08-25 | 京信通信系统（中国）有限公司 | Digital communication system and method for improving flatness in signal band thereof |
| CN101895503A (en) * | 2010-07-26 | 2010-11-24 | 中兴通讯股份有限公司 | Signal processing method and device for LTE base station side |
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| CN101977020A (en) * | 2010-02-26 | 2011-02-16 | 京信通信系统（中国）有限公司 | Digital up/down frequency conversion system and implementation method thereof |
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| CN101764630B (en) * | 2009-08-13 | 2013-01-16 | 中国科学院苏州纳米技术与纳米仿生研究所 | Dual-mode wireless communication system for radio frequency and visible light and working method thereof |
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| CN101796751B (en) * | 2007-09-04 | 2014-08-20 | 西门子公司 | Apparatus for transmitting data between two systems which move relative to one another |
| WO2009076845A1 (en) * | 2007-12-05 | 2009-06-25 | Huawei Technologies Co., Ltd. | An optical access network data transmission method, and the system and the device thereof |
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| CN101521539B (en) * | 2008-02-25 | 2012-12-19 | 京信通信系统（中国）有限公司 | Wideband digital frequency-selecting wireless repeater system and wideband signal digital frequency-selecting method thereof |
| CN101257481B (en) * | 2008-04-22 | 2012-09-05 | 中兴通讯股份有限公司 | System and method for cutting peak of preprocess discontinuousness allocating multiple carrier waves |
| CN101488795B (en) * | 2009-01-08 | 2014-01-08 | 中邮科通信技术股份有限公司 | Optical fiber digital transmission method applied on straight-forward station |
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| CN101764630B (en) * | 2009-08-13 | 2013-01-16 | 中国科学院苏州纳米技术与纳米仿生研究所 | Dual-mode wireless communication system for radio frequency and visible light and working method thereof |
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| CN101977020A (en) * | 2010-02-26 | 2011-02-16 | 京信通信系统（中国）有限公司 | Digital up/down frequency conversion system and implementation method thereof |
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