CN106230511B - 5G distributed base station antenna rf optical transmission systems - Google Patents
5G distributed base station antenna rf optical transmission systems Download PDFInfo
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- CN106230511B CN106230511B CN201610770832.0A CN201610770832A CN106230511B CN 106230511 B CN106230511 B CN 106230511B CN 201610770832 A CN201610770832 A CN 201610770832A CN 106230511 B CN106230511 B CN 106230511B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 46
- 230000003287 optical effect Effects 0.000 title claims abstract description 31
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 239000013307 optical fiber Substances 0.000 abstract description 14
- 230000006641 stabilisation Effects 0.000 abstract description 7
- 238000011105 stabilization Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 5
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- 238000005516 engineering process Methods 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
- H04B10/25752—Optical arrangements for wireless networks
- H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
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Abstract
The present invention relates to a kind of 5G distributed base stations antenna rf optical transmission system, phase pushing figure obtains：Using the two divided-frequency signal of radio-frequency input signals in optical fiber round-trip transmission, the phase pushing figure of radio frequency fiber optic transmission is obtained；Phase distortion pre-compensates for：Radio-frequency input signals and local two divided-frequency signal are subjected to up-conversion in transmitting terminal, obtain the signal of 1.5 overtones bands, then with the round-trip transmission two divided-frequency signal down coversion containing phase pushing figure, obtain phase distortion precompensation radiofrequency signal；The acquisition of steady phase signals：The phase distortion precompensation radiofrequency signal demodulation Jing Guo long distance transmission is obtained into the radio frequency output signal of phase stabilization in receiving terminal.Its decorum includes the transmitting terminal and receiving terminal being connected by Transmission Fibers, and the transmitting terminal includes two-divider, upconverter, low-converter, optical sender, circulator and photoreceiver；The receiving terminal includes photoreceiver and half-reflecting mirror；Phase stabilization precision of the present invention is high, and at low cost.
Description
Technical field
The present invention relates to a kind of 5G distributed base stations antenna rf optical transmission method and systems, belong to a kind of frequency microwave biography
Transmission method field.
Background technology
Important component of the new generation broadband wireless mobile communication net as generation information infrastructure passes through its people
Ji, society, culture and the development of Defence business have huge impetus.As 4G enters scale commercial stage, towards
The new generation broadband wireless mobile communications such as the year two thousand twenty and 4G in future enhancings, 5G and rear 5G have become global development hot spot.Wherein,
Large-scale antenna array and distributed aerial array are the main arrangement scenes of the base stations 5G.In distributed scene, radiofrequency signal
Optical fiber transmission have unique technical advantage.With the continuous development of optical fiber transmission technique, photoelectric device function it is continuous complete
Kind, photoelectric technology has played increasingly important function in current various electronic systems.Since fibre-optic transmission system (FOTS) has body
Product is small, light-weight, the small, long transmission distance of loss, electromagnetism interference, with roomy and high channel capacity advantage, to solve tradition
Microwave and millimeter wave Transmission system existing for problems provide good technological means so that optical fiber transmission technique is communicating
It is more and more widely used in system.
In radio frequency fiber optic transmission system, the phase of output signal is directly proportional to its time delay.The size of propagation delay time and permitted
Multifactor correlation, such as incident wavelength, optical fiber structure and environment temperature etc., in these factors, environment temperature it is random
Fluctuations will consumingly influence the refractive index of optical fiber, and the time delay of signal is caused to be drifted about, and then generate phase fluctuation.Radio frequency is believed
Number frequency is higher, and phase fluctuation is sometimes also very big, the coherent performance of the electronic systems such as communication has been seriously affected, for this purpose, surely
The phase for determining radio frequency fiber optic long distance transmission is particularly critical to the wideband electronics communication system such as 5G.
It is general at present that phase drift, the radio frequency letter of input are adjusted using the method for increasing automatically controlled delay line in optical link
Number by optical sender output after optical fiber transmits, the reflection of part signal is carried out in receiving terminal, reflection signal is again by optical fiber
It is transmitted back to transmitting terminal, will reflect back into the signal come in transmitting terminal and sends out signal progress phase demodulation, phase shift value is obtained, by number
The retardation of word signal processing pilot delay line again, of high cost, phase stabilization precision is low, cannot meet 5G communication equipment radio frequencies biography
Defeated requirement.
Invention content
It is high that the present invention provides a kind of phase stabilization precision in view of the above problems, and 5G distributed base station antennas at low cost
Radio frequency optical transmission method and system.
In order to solve the above technical problem, the present invention provides a kind of 5G distributed base stations antenna rf optical transmission system, packets
Include the transmitting terminal and receiving terminal being connected by Transmission Fibers.The transmitting terminal include two-divider, upconverter, low-converter,
Optical sender, circulator and photoreceiver；First output end of the two-divider is connected with the input terminal of optical sender；It is described
The input terminal of circulator is connected with the output end of optical sender；In the second output terminal and upconverter of the two-divider
Frequency end is connected；The local oscillator end of the low-converter is connected with the radio-frequency head of upconverter；The intermediate frequency end of the low-converter and light
The output end of receiver is connected；The input terminal of the photoreceiver is connected with the output end of circulator；The low-converter is penetrated
Frequency end is connected with the input terminal of optical sender.The receiving terminal includes photoreceiver and half-reflecting mirror；The half-reflecting mirror it is defeated
Outlet is connected with the input terminal of photoreceiver；The sending and receiving end phase that the input terminal of the half-reflecting mirror passes through Transmission Fibers and circulator
Even；The two-divider and the input terminal of upconverter are connected with radio-frequency input signals；The output end of the photoreceiver is defeated
Go out radio frequency output signal.
Cost of implementation of the present invention is low：The present invention has abandoned automatically controlled delay line of high cost, with the collection largely used at present
Reach the steady phase effect realized with automatically controlled delay line at the two divided-frequency of change, up-conversion, down coversion chip.Phase stabilization precision
It is high：The present invention avoids complicated number letter with RF signal processing technologies such as two divided-frequency, up-conversion and the down coversions of radio frequency
Number processing procedure, the variation of timely tracing compensation transmission phase drift, using 10GHz radiofrequency signals of the present invention by 20 kilometers of biographies
After defeated, phase drift control in 60 minutes has reached the requirement that radio frequency surely mutually transmits within 3 degree.
Description of the drawings
Fig. 1 is 5G distributed base stations antenna rf optical transmission method flow chart of the present invention.
Fig. 2 is that phase distortion pre-compensates for flow chart of steps in Fig. 1.
The 5G distributed base station antenna rf optical transmission system functional block diagrams of Fig. 3 methods to realize the present invention.
Fig. 4 is the phase drift result figure that 5G distributed base station antenna rf optical transports are carried out using the prior art.
Fig. 5 is the phase drift result figure that 5G distributed base station antenna rf optical transports are carried out using the present invention.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings.
As shown in Figure 1, the present invention provides a kind of 5G distributed base stations antenna rf optical transmission methods, including walk as follows
Suddenly：
The first step：Phase pushing figure obtains：Using the two divided-frequency signal of radio-frequency input signals in optical fiber round-trip transmission, obtain
The phase pushing figure of radio frequency fiber optic transmission；
Second step：Phase distortion pre-compensates for：Radio-frequency input signals and local two divided-frequency signal are subjected to upper change in transmitting terminal
Frequently, obtain the signal of 1.5 overtones bands, then with the round-trip transmission two divided-frequency signal down coversion containing phase pushing figure, obtain phase
Distortion precompensation radiofrequency signal；
Third walks：The acquisition of steady phase signals：In receiving terminal, by the phase distortion precompensation radio frequency letter Jing Guo long distance transmission
Number demodulation, obtain the radio frequency output signal of phase stabilization.
By two divided-frequency signal (0.5F frequencies), round-trip transmission, transmission path are radio signal transmission path in a fiber
2 times, transmission frequency is the half of radio frequency signal frequency, and the two synthesis can just obtain radiofrequency signal one-way transmission
Phase drift amount, the phase drift amount pass through down-converted in transmitting terminal, the radiofrequency signal of predistortion are formd, by optical fiber
Transmission, the signal of predistortion just compensates for the transmission distortion of optical fiber, and the radio frequency letter of phase stabilization has just been obtained in receiving terminal
Number.
The phase distortion precompensation specifically includes the following contents (as shown in Figure 2)：
In transmitting terminal, frequency is the radio-frequency input signals of F, is divided into after 2 frequency dividers obtain the signal that frequency is 0.5F
Two-way：All the way with the radio-frequency input signals up-conversion that frequency is F, the addition of signal frequency is realized in upconverter, obtains frequency
Rate is the signal of 1.5F；Another way is sent into optical sender, and the signal modulation of frequency 0.5F is sent into optical fiber in laser carrier to be carried out
Transmission；
In receiving terminal, using half-reflecting mirror reflective portion radio frequency optical modulation signal, it is reflected into the circulator of transmitting terminal, then into
Enter photoreceiver, recover the signal that frequency is 0.5F, 0.5F signals at this time just contain Transmission Fibers and become by various environment
Change influence and the phase drift amount of the radiofrequency signal of generation；It, should the 0.5F containing phase drift amount in the down coversion of transmitting terminal
The signal frequency of signal and 1.5F are subtracted each other, and it is F to have obtained frequency, reduces the signal of Transmission Fibers phase drift in advance；By the letter
Number it is also fed into optical sender, is modulated on laser carrier and is transmitted, recover the radio frequency of frequency F by photoreceiver in receiving terminal
Signal.
As shown in figure 3, the system for realizing 5G distributed base station antenna rf optical transmission methods, including pass through Transmission Fibers
300 connected transmitting terminals 100 and receiving terminal 200,
The transmitting terminal includes two-divider 101, upconverter 102, low-converter 103, optical sender 104, circulator
105 and photoreceiver 106；First output end of the two-divider 101 is connected with the input terminal of optical sender 104；The ring
The input terminal of shape device 105 is connected with the output end of optical sender 104；The second output terminal and up-conversion of the two-divider 101
The intermediate frequency end of device 102 is connected；The local oscillator end of the low-converter 103 is connected with the radio-frequency head of upconverter 102；The down coversion
The intermediate frequency end of device 103 is connected with the output end of photoreceiver 106；The input terminal of the photoreceiver 106 is defeated with circulator 105
Outlet is connected；The radio-frequency head of the low-converter 103 is connected with the input terminal of optical sender 104；
The receiving terminal includes photoreceiver 201 and half-reflecting mirror 202；The output end of the half-reflecting mirror 202 connects with light
The input terminal of receipts machine 201 is connected；The sending and receiving end that the input terminal of the half-reflecting mirror 202 passes through Transmission Fibers 300 and circulator 105
It is connected；The two-divider 101 and the input terminal of upconverter 102 are connected with radio-frequency input signals；The photoreceiver 201
Output end export radio frequency output signal.
As shown in figure 4, to carry out the phase drift result figure of long range radio signal transmission using the prior art, frequency is
The radiofrequency signal of 10GHz is transmitted by 20 kilometers of optical fiber, and using the prior art, in 60 minutes, phase drift is more than
5000 degree.
As shown in figure 5, to carry out the phase drift result figure of long range radio signal transmission using the present invention, frequency is same
For the radiofrequency signal of 10GHz, 20 kilometers of optical fiber transmission is also passed through, the technology of the present invention, in 60 minutes, phase are utilized
Position drift control realizes the steady of radiofrequency signal and mutually transmits within 3 degree.
Embodiments of the present invention are not limited by examples detailed above, it will be understood by those of ordinary skill in the art that,
Its any modification made without departing from the spirit and principles of the present invention or equivalent replacement should be equivalent displacement
Mode is included within the scope of the present invention.
Claims (1)
1. a kind of 5G distributed base stations antenna rf optical transmission system, which is characterized in that including being connected by Transmission Fibers (300)
Transmitting terminal (100) and receiving terminal (200),
The transmitting terminal includes two-divider (101), upconverter (102), low-converter (103), optical sender (104), ring
Shape device (105) and photoreceiver (106)；The input terminal of the first output end and optical sender (104) of the two-divider (101)
It is connected；The input terminal of the circulator (105) is connected with the output end of optical sender (104)；The of the two-divider (101)
Two output ends are connected with the intermediate frequency end of upconverter (102)；The local oscillator end of the low-converter (103) and upconverter (102)
Radio-frequency head be connected；The intermediate frequency end of the low-converter (103) is connected with the output end of photoreceiver (106)；The light-receiving
The input terminal of machine (106) is connected with the output end of circulator (105)；The radio-frequency head and optical sender of the low-converter (103)
(104) input terminal is connected；
The receiving terminal includes photoreceiver (201) and half-reflecting mirror (202)；The output end and light of the half-reflecting mirror (202)
The input terminal of receiver (201) is connected；The input terminal of the half-reflecting mirror (202) passes through Transmission Fibers (300) and circulator
(105) sending and receiving end is connected；
The input terminal of the two-divider (101) and upconverter (102) is connected with radio-frequency input signals；The photoreceiver
(201) output end exports radio frequency output signal.
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| CN201610770832.0A CN106230511B (en) | 2016-08-31 | 2016-08-31 | 5G distributed base station antenna rf optical transmission systems |
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| CN201610770832.0A CN106230511B (en) | 2016-08-31 | 2016-08-31 | 5G distributed base station antenna rf optical transmission systems |
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| CN106230511B true CN106230511B (en) | 2018-07-17 |
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| CN113381956B (en) * | 2021-08-13 | 2021-12-03 | 电子科技大学 | Safe communication method based on motion state space position point |
| CN115189776B (en) * | 2022-07-06 | 2025-02-11 | 南京航空航天大学 | Passive phase-stable optical transmission method and system for radio frequency signals |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5196093B2 (en) * | 2006-04-20 | 2013-05-15 | 日本電気株式会社 | Optical communication apparatus and quantum cryptography key distribution system using the same |
| CN103501199A (en) * | 2013-09-30 | 2014-01-08 | 中国人民解放军理工大学 | Phase control device and phase control device for phase-stabilized transmission of radio-frequency signal |
| CN103716089A (en) * | 2013-12-26 | 2014-04-09 | 南京航空航天大学 | RF signal optical fiber phase-stabilized transmission method and system |
| CN103780312A (en) * | 2014-01-21 | 2014-05-07 | 南京航空航天大学 | Radio-frequency signal stable-phase transmission method and system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206099989U (en) * | 2016-08-31 | 2017-04-12 | 南京恩瑞特实业有限公司 | 5G distributing type base station antenna radio frequency optical transmission system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5196093B2 (en) * | 2006-04-20 | 2013-05-15 | 日本電気株式会社 | Optical communication apparatus and quantum cryptography key distribution system using the same |
| CN103501199A (en) * | 2013-09-30 | 2014-01-08 | 中国人民解放军理工大学 | Phase control device and phase control device for phase-stabilized transmission of radio-frequency signal |
| CN103716089A (en) * | 2013-12-26 | 2014-04-09 | 南京航空航天大学 | RF signal optical fiber phase-stabilized transmission method and system |
| CN103780312A (en) * | 2014-01-21 | 2014-05-07 | 南京航空航天大学 | Radio-frequency signal stable-phase transmission method and system |
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