CN101488795A - Optical fiber digital transmission method applied on straight-forward station - Google Patents
Optical fiber digital transmission method applied on straight-forward station Download PDFInfo
- Publication number
- CN101488795A CN101488795A CNA200910110821XA CN200910110821A CN101488795A CN 101488795 A CN101488795 A CN 101488795A CN A200910110821X A CNA200910110821X A CN A200910110821XA CN 200910110821 A CN200910110821 A CN 200910110821A CN 101488795 A CN101488795 A CN 101488795A
- Authority
- CN
- China
- Prior art keywords
- signal
- digital
- optical fiber
- carrier wave
- transmission method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Optical Communication System (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention relates to an optical fiber digitalization transmission method applied to straight amplification station, the method comprises: converting a radio frequency signal of a signal source into an IF signal and a broad band digital signal; separating and moving the known carrier wave in the broad band digital signal into the baseband by digital down-conversion; packing the baseband signal and the monitoring signal into CPRI or other standard high speed serial protocol data and transmitting into the other compatible apparatus by optical fiber; de-packing the CPRI or other standard high speed serial protocol data by the compatible apparatus to separate the baseband signal and the monitoring signal; moving each baseband signal into IF, then adding to form a broad band digital intermediate frequency; converting the digital IF signal into a simulation IF signal by a high speed DAC; converting the simulation intermediate frequency into the radio frequency signal, transmitting by the aerial through being amplified by a power amplifier. The apparatus designed by the invention can enable the networking of the optical fiber straight amplifying station to be flexible, thereby greatly improving the engineering debugging simplicity.
Description
Technical field
The present invention relates to a kind of optical fiber and digital transmission method that is applied to the repeater.
Background technology
Repeater (repeater) belongs to the frequency multiplying arrangement, is meant to play a kind of radio transmission transferring equipment that signal strengthens in the wireless communication transmissions process.The basic function of repeater is exactly a radiofrequency signal power intensifier.The repeater by pickoff signals in the existing overlay area of donor antenna,, is transmitted into the signal of filtering once more after power amplifier amplifies and treats the overlay area carrying out fabulous isolation with logical outer signal by band pass filter in down link.In the uplink path, the signal of the travelling carriage mobile phone in the overlay area is transmitted into corresponding base station with same working method after by up amplification link processing, thereby reaches the signal transmission of base station and mobile phone.
In traditional optical fiber repeater system, adopt the direct modulation-demo-demodulation method of radiofrequency signal and light signal to come transmission signals usually.The shortcoming of doing like this is, 1. attenuated optical signal is bigger, 2. the light signal radiofrequency signal of carrying signal to noise ratio in the decay of light signal reduces, 3. the networking to frequency-selecting and frequency distributes and can only realize in analogue device, there is not flexibility, 4. not to signal digitalized, advanced technology such as digital despicking commonly used, digital pre-distortion in the employing code division multiple access standard of having no idea.
Signal digitalized problem above just having solved, and optical fiber is very beneficial for the transmitting high speed serial digital signal, and therefore a kind of optical fiber and digital transmission method that is applied to the repeater and device become and be starved of.
Summary of the invention
The object of the present invention is to provide a kind of optical fiber and digital transmission method that is applied to the repeater, adopt the device of this method design that the networking flexibility of optical fiber repeater, engineering debug simplification are improved greatly.
This method comprises the steps:
A. the radiofrequency signal with signal source is converted into analog if signal, and high-speed ADC is converted to wideband digital signal with this analog if signal;
B. with the known carrier wave in the wideband digital signal by Digital Down Convert, separate and move base band;
C. baseband signal and pilot signal are packaged into CPRI or other standard high speed serial protocol data, arrive another compatible equipment by Optical Fiber Transmission;
D. this compatible equipment is taked to arrive the opposite sequential processes signal of c step with the b step, that is, CPRI or other standard high speed serial data protocol data are unpacked, and isolates baseband signal and pilot signal; Each baseband signal is moved intermediate frequency and addition formation wideband digital intermediate frequency;
E. with high-speed DAC digital medium-frequency signal is converted to analog if signal; Again analog intermediate frequency is converted into radiofrequency signal, after amplifying through power amplifier, launches through antenna.
Description of drawings
Fig. 1 is the uplink downlink design diagram of the digital optical fiber direct station of design according to the present invention;
Fig. 2 a, 2b are for being the carrier processing schematic diagram of example with the CDMA20003 carrier wave.
Embodiment
With CDMA2000 repeater 3 carrier waves is example, and the execution mode of system is as follows.
In down link, optical fiber A end through links such as filtering, LNA, analog frequency mixings, is exported the analog intermediate frequency of a 70～140MHz by towards the antenna of base station end or attached to the coupler received RF signal on the antenna.As shown in Figure 1.
Analog if signal is converted to digital signal through the sampling (the general use owed sampling) of high-speed ADC, enters the Digital Signal Processing stage.
In the process of Digital Down Convert, sampling, digital mixer and digital filter are moved base band with carrier wave flexibly.Shown in Fig. 2 a, 3 carrier wave centers lay respectively at 1.23MHz, 2.46MHz and 6.15MHz.Can be according to common processing mode, handle 3 carrier waves respectively with three passages, each passage all comprises independently digital controlled oscillator NCO and bank of filters CIC/CFIR/PFIR, and Digital Down Convert is output as the I/Q data of three carrier waves, and data rate is 2.4576Msps.Also can be according to the design among Fig. 2 b, close two carrier wave 1.23MHz and 2.46MHz are handled as a self-defined carrier wave, so just formed the situation of two self-defined carrier waves, the I/Q data rate can all be 2.4576Msps, perhaps 4.9152Msps of a 2.4576Msps perhaps is 4.9152Msps.The main influence of doing like this is the filter difference of two self-defined carrier waves, and the I/Q data rate of carrier wave may be also different.
The advantage that adopts self-defined carrier wave is an advantage of 1. having brought into play the repeater self-organizing system, as long as the optical fiber side a and b is done alignment processing, 2. the system that just do not influence has not reduced " carrier number " by the carrier wave grouping, and shortcoming is the inconsistent of the inconsistent and I/Q data rate of Filter Design.
Next, with FPGA or special chip the one-tenth that base band data carries out standard agreement is separated the frame processing, for example, can carry out CPRI agreement framing to base band data and monitor data with FPGA, by the SERDES chip Frame is converted to high-speed serial data then, is sent to optical communications module SFP.
Signal recovers high-speed serial data by optical communications module after arriving optical fiber B end, by the SERDES chip unstring, FPGA separates frame and isolates each carrier wave and pilot signal.
In the conversion process, each carrier wave is put into and the corresponding position of A end in number through bank of filters and digital controlled oscillator.That is,, need be placed into 1.23MHz, 2.46MHz and 6.15MHz to corresponding carrier wave if the common carrier wave of sampling is cut apart; If the self-defined carrier wave of sampling is cut apart, need be placed into 1.845MHz to self-defined carrier wave 1, self-defined carrier wave 2 is placed into 6.15MHz.Utilize the independence on the frequency domain, time domain I/Q data addition is unlikely to obscure, finally form the wideband digital intermediate-freuqncy signal.In the path of digital intermediate frequency, can add crest factor and cut down a series of digitized processing links such as CFR, digital pre-distortion DPD.
Through the digital-to-analogue conversion of high-speed DAC, form analog if signal, be sent to Analogue mixer, after mixing, filtering, amplification, be transmitted into the area of coverage from antenna.
Up link is also done similar processing, and thus, the path is handled in the repeater that forms complete " the simulation progressive die is drawn up the sandwich digit Optical Fiber Transmission ".
More than be preferred embodiment of the present invention, all changes of doing according to technical solution of the present invention when the function that is produced does not exceed the scope of technical solution of the present invention, all belong to protection scope of the present invention.
Claims (5)
1. optical fiber and digital transmission method that is applied to the repeater, it is characterized in that: this method comprises the steps:
A. the radiofrequency signal with signal source is converted into analog if signal, and high speed analog-digital converter ADC is converted to wideband digital signal with this analog if signal;
B. with the known carrier wave in the wideband digital signal by Digital Down Convert, separate and move base band;
C. baseband signal and pilot signal are packaged into CPRI or other standard high speed serial protocol data, arrive another compatible equipment by Optical Fiber Transmission;
D. this compatible equipment is taked to arrive the opposite sequential processes signal of step c with step b, that is, CPRI or other standard high speed serial data protocol data are unpacked, and isolates baseband signal and pilot signal; Each baseband signal is moved intermediate frequency and addition formation wideband digital intermediate frequency;
E. with high-speed DAC the wideband digital intermediate-freuqncy signal is converted to analog if signal; Again analog intermediate frequency is converted into radiofrequency signal, after amplifying through power amplifier, launches by antenna.
2. a kind of optical fiber and digital transmission method that is applied to the repeater according to claim 1, it is characterized in that: described step b, the combination of known carrier wave in the wideband digital signal or known carrier wave is cut apart, form one or several self-defining " carrier wave ", separately carrier wave center and carrier bandwidths are arranged.
3. a kind of optical fiber and digital transmission method that is applied to the repeater according to claim 1 and 2 is characterized in that: described b step, self-defining " carrier wave " respectively by Digital Down Convert, moved base band.
4. a kind of optical fiber and digital transmission method that is applied to the repeater according to claim 1, it is characterized in that: described step c, baseband signal and pilot signal are packaged into CPRI or other standard high speed serial data protocol data, and baseband signal and pilot signal are in same physical channel.
5. a kind of optical fiber and digital transmission method that is applied to the repeater according to claim 1 is characterized in that: described step a is suitable for to the method for step e up link and the down link for communication link.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910110821.XA CN101488795B (en) | 2009-01-08 | 2009-01-08 | Optical fiber digital transmission method applied on straight-forward station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910110821.XA CN101488795B (en) | 2009-01-08 | 2009-01-08 | Optical fiber digital transmission method applied on straight-forward station |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101488795A true CN101488795A (en) | 2009-07-22 |
| CN101488795B CN101488795B (en) | 2014-01-08 |
Family
ID=40891496
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910110821.XA Active CN101488795B (en) | 2009-01-08 | 2009-01-08 | Optical fiber digital transmission method applied on straight-forward station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101488795B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917781A (en) * | 2010-08-30 | 2010-12-15 | 武汉邮电科学研究院 | Method and device for achieving digital down-conversion function of RRU (Remote Radio-frequency Unit) uplink chain path |
| CN102647385A (en) * | 2012-03-30 | 2012-08-22 | 杭州畅鼎科技有限公司 | Automatic frequency tracking method and automatic frequency tracking device for digital optical-fiber repeater |
| RU2480912C2 (en) * | 2011-08-09 | 2013-04-27 | Государственное образовательное учреждение высшего профессионального образования Академия Федеральной службы охраны Российской Федерации (Академия ФСО России) | Method of digital optical communication |
| CN104221308A (en) * | 2012-04-17 | 2014-12-17 | 剑桥企业有限公司 | Sending RF signals over a wired communications link |
| CN104485986A (en) * | 2014-12-18 | 2015-04-01 | 福建师范大学 | Relay communication system based on LTE |
| CN104485987A (en) * | 2014-12-18 | 2015-04-01 | 福建师范大学 | Relay communication method based on LTE |
| CN107437950A (en) * | 2017-08-04 | 2017-12-05 | 杭州长泽科技有限公司 | A kind of tunnel fm broadcast signal numeral covering scheme and implementation method |
| WO2018000120A1 (en) * | 2016-06-27 | 2018-01-04 | 华为技术有限公司 | Signal processing method and microwave communication device |
| WO2022267793A1 (en) * | 2021-06-21 | 2022-12-29 | 中兴通讯股份有限公司 | Signal transmission method, transmission system, and electronic device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1719756B (en) * | 2005-07-25 | 2010-04-07 | 京信通信技术(广州)有限公司 | Method for implementing mobile communication digital optical fibre repeater system |
| CN1801673A (en) * | 2006-01-17 | 2006-07-12 | 京信通信技术(广州)有限公司 | Mobile communication repeater system applying digital intermediate frequency mode |
| CN200980076Y (en) * | 2006-03-02 | 2007-11-21 | 福建邮科通信技术有限公司 | A TD-SCDMA mobile communication wireless repeater |
-
2009
- 2009-01-08 CN CN200910110821.XA patent/CN101488795B/en active Active
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917781A (en) * | 2010-08-30 | 2010-12-15 | 武汉邮电科学研究院 | Method and device for achieving digital down-conversion function of RRU (Remote Radio-frequency Unit) uplink chain path |
| RU2480912C2 (en) * | 2011-08-09 | 2013-04-27 | Государственное образовательное учреждение высшего профессионального образования Академия Федеральной службы охраны Российской Федерации (Академия ФСО России) | Method of digital optical communication |
| CN102647385A (en) * | 2012-03-30 | 2012-08-22 | 杭州畅鼎科技有限公司 | Automatic frequency tracking method and automatic frequency tracking device for digital optical-fiber repeater |
| CN102647385B (en) * | 2012-03-30 | 2015-07-08 | 杭州畅鼎科技有限公司 | Automatic frequency tracking method and automatic frequency tracking device for digital optical-fiber repeater |
| CN104221308A (en) * | 2012-04-17 | 2014-12-17 | 剑桥企业有限公司 | Sending RF signals over a wired communications link |
| CN104221308B (en) * | 2012-04-17 | 2017-10-13 | 剑桥企业有限公司 | RF signals on wired communications links are sent |
| CN104485986A (en) * | 2014-12-18 | 2015-04-01 | 福建师范大学 | Relay communication system based on LTE |
| CN104485987A (en) * | 2014-12-18 | 2015-04-01 | 福建师范大学 | Relay communication method based on LTE |
| WO2018000120A1 (en) * | 2016-06-27 | 2018-01-04 | 华为技术有限公司 | Signal processing method and microwave communication device |
| CN109076641A (en) * | 2016-06-27 | 2018-12-21 | 华为技术有限公司 | Signal processing method and microwave telecommunication devices |
| CN107437950A (en) * | 2017-08-04 | 2017-12-05 | 杭州长泽科技有限公司 | A kind of tunnel fm broadcast signal numeral covering scheme and implementation method |
| WO2022267793A1 (en) * | 2021-06-21 | 2022-12-29 | 中兴通讯股份有限公司 | Signal transmission method, transmission system, and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101488795B (en) | 2014-01-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101488795B (en) | Optical fiber digital transmission method applied on straight-forward station | |
| CN103828259B (en) | Distributing antenna system framework | |
| EP2953283B1 (en) | Method, apparatus, and radio remote unit for transmitting wireless base band data | |
| CN103379674B (en) | A kind of multimode numeral DAS system supporting multiple source to access | |
| CN102130697A (en) | Receiver, transmitter and feedback device, transceiver and signal processing method | |
| CN102457458A (en) | Digital pre-distortion realization method of base station and apparatus thereof | |
| CN101668356A (en) | Dual-mode digital radio remote unit (RRU) | |
| CN105406925B (en) | Multi-frequency-band digital optical fiber distributed type antenna system | |
| WO2017142124A1 (en) | Multi-path communication device for sharing feedback path for digital pre-distortion | |
| CN102611476A (en) | Transceiver with twice-frequency-conversion structure for 60GHz wireless communication | |
| EP2775681A1 (en) | Method, device and base station system for transceiving and processing radio frequency signal | |
| CN102611475A (en) | Direct variable-frequency transmitter-receiver for 60 GHz wireless communication | |
| CN201114046Y (en) | Digital optical fibre repeater station system possessing up link multichannel receiving function | |
| CN101494493B (en) | Digital direct discharging station using digital microwave transmission | |
| CN206041994U (en) | Miniature repeater of multifrequency digit | |
| CN104935371A (en) | High-speed orthogonal frequency division multiplexing (OFDM) wireless relay transmission system | |
| CN203574664U (en) | LTE digital double-channel transmission apparatus | |
| CN201054712Y (en) | Digital middle-frequency bandwidth adjustable radio repeater | |
| CN203387690U (en) | Multi-mode digital DAS supporting multi-source access | |
| CN101262270A (en) | A method and device for realizing digital remote communication in the base station system | |
| CN201243292Y (en) | Digital frequency selection optical fiber station | |
| CN104917569A (en) | Analog-digital mixed radio frequency optical fiber transmission architecture aiming at large-scale antenna array | |
| CN113037386B (en) | Central unit and remote unit | |
| EP3091668A1 (en) | Receiver arrangement for use in a digital repeater system | |
| CN207166490U (en) | A kind of LTE digital high-frequency amplification stations |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB02 | Change of applicant information |
Address after: Fuzhou City, Fujian province 350005 51 Road No. 57 East Building Room 1203 Applicant after: China Youke Communication Technology Co., Ltd. Address before: Fuzhou City, Fujian province 350005 51 Road No. 57 East Building Room 1203 Applicant before: Fujian Youke Communication Technology Co., Ltd. |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: APPLICANT; FROM: FUJIAN YOUKE COMMUNICATION TECHNOLOGY CO., LTD. TO: CHINA YOUKE COMMUNICATION TECHNOLOGY CO., LTD. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |