CN101001114A - Full duplex fibre-optical radio communication system of simple structure - Google Patents
Full duplex fibre-optical radio communication system of simple structure Download PDFInfo
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- CN101001114A CN101001114A CNA200610136716XA CN200610136716A CN101001114A CN 101001114 A CN101001114 A CN 101001114A CN A200610136716X A CNA200610136716X A CN A200610136716XA CN 200610136716 A CN200610136716 A CN 200610136716A CN 101001114 A CN101001114 A CN 101001114A
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Abstract
This invention discloses a fiber radio communication system of a simple structure and capable of providing full-duplex communication in the ROF communication system, which uses an electric mixer to generate mm wave signals at the central station and carries out double-side-band modulation to the signals to generate double-side-band modulated signals to be sent to the base station, takes the central carrier wave in the signals as the light carrier in the up link and applies a photomodulator to modulate data in the up link of a user mobile terminal onto the light carrier to be sent to the base station for treatment and picks up double-frequency one step side-band in the signals to generate necessary electric-mm waves by a photo-detector and emitted by an antenna.
Description
(1) technical field
The invention belongs to hybrid fiber-radio communication (Radio-over-Fiber is abbreviated as ROF) communication system technical field.
(2) background technology
Because the communication frequency that the next generation ultra wide band wireless communication technology adopts will extend to millimere-wave band, in order to overcome for example restriction of transmission range aspect of radio communication, satisfy broadband requirement in the radio communication, must utilize existing Fibre Optical Communication Technology, therefore optical fiber-radio communication (Radio-Over-Fiber abbreviates ROF as) will become the technology that the next generation ultra wide band wireless access has prospect most that solves.The enormous bandwidth that the ROF system can make full use of optical fiber to be reducing cost and the flexibility of the combining wireless communication technology, will be wireless and the optical-fiber network fusion become and a kind ofly can increase Access Network capacity and mobility, the novel access network that can cut operating costs again.The basic thought of ROF system is the signal processing unit centering station with complexity, and (Central Station is abbreviated as CS) as producing optical millimeter wave at central station, and is sent to the base station by optical fiber.And base station (BaseStation, be abbreviated as BS) only comprise the receiving device of cheap and simple, promptly finish opto-electronic conversion, and go out by antenna transmission, the wireless signal of also antenna being received simultaneously is sent to central station and carries out Signal Processing by electricity/light conversion becoming light signal.Because the signal processing unit at each base station Sharing Center station has reduced expensive signal processing unit quantity like this, thereby has simplified the complexity and the structure of base station.
In central station, the optical millimeter wave generating technique is the key technology of ROF system, and up to now, the method for the generation of the optical millimeter wave that has proposed has three kinds: direct intensity modulated, external intensity modulation and long-range heterodyne technology.Up to now, have higher reliability and characteristic at a low price based on the optical millimeter wave generation scheme of external modulator, thereby most possibly become the one preferred technique that produces optical millimeter wave in the ROF system.But all must adopt two optical modulators in the scheme of present employing external modulation technology generation optical millimeter wave, one of them single electrode modulator is used for modulating baseband signal, another double-electrode modulator is used to produce optical millimeter wave, has so just increased the cost that optical millimeter wave produces.Therefore adopt optical millimeter wave generating technique simple in structure to become one of key issue of ROF practicability.
Another problem is in the full duplex ROF communication system: in up link, antenna receives the signal that comes from wireless user's end and must be sent to central station then and carry out the light signal processing by modulators modulate to light carrier.Therefore in the base station, must there be a laser to produce the light carrier of up link.Because millimeter wave transmission range in atmosphere is short, realize the covering fully of signal, the machine station distribution certainly will be very close, therefore how project organization base station simple, low-cost millimetre-wave attenuator has just become the critical problem that optical fiber radio communication system institute must solution.Above-mentioned technology uses the laser generation to be used for the up link light carrier in the base station, has obviously increased the cost of base station.
In order to address the above problem, our scheme is earlier base-band data signal and radiofrequency signal mixing to be produced electric millimeter wave in central station, more electric millimeter wave is driven external modulator, makes external modulator produce the light signal of double-sideband modulation.Comprise double frequency single order sideband signals and centered carrier in the double-sideband signal, double frequency single order sideband can be used for producing optical millimeter wave.Simultaneously, the centered carrier and the optical millimeter wave that in central station laser are produced send to the base station by optical fiber together, and centered carrier then can be used as the light carrier of up link.This method only needs to adopt simple single electrode modulator to carry out double-sideband modulation, just can realize producing simultaneously optical millimeter wave and light carrier.Produce optical millimeter wave with the light carrier inhibition method that has proposed and compare, it does not need to add in addition other optics and suppresses the light center carrier wave.Reduced the cost of central station and base station so simultaneously, made whole system simple in structure, realized easily and low price.
(3) summary of the invention
At above-mentioned situation, the purpose of this invention is to provide a kind of simple optical millimeter wave production method and the hybrid fiber wireless system that can realize full-duplex communication, the structure of center of reduction station and base station finally reduces the cost of central station and base station.Particularly, the invention provides a kind of effectively simple optical millimeter wave production method, in the method, produce electric millimeter wave earlier at central station, and then by light modulation techniques generation double-sideband signal, and centered carrier sent to the base station with optical millimeter wave, utilize the center light carrier wave that sends in the down link light carrier, and proposed a kind of full duplex ROF communication system simple in structure thus as up link.
To achieve these goals, to produce concrete scheme as follows for optical millimeter wave of the present invention:
In central station, adopted electric frequency mixer that base-band data signal and radiofrequency signal are carried out producing electric millimeter wave after the mixing, driven unipolar light intensity modulator by electric millimeter wave and produce the double-sideband modulation signal.Only use a single electrode electrooptic modulator and an electric frequency mixer at central station like this, thereby simplified the structure of central station.
To achieve these goals, the present invention also provides a full duplex fibre-optical radio communication system simple in structure.Concrete scheme is as follows:
At first utilize optical millimeter wave production method of the present invention to produce the double-sideband modulation signal in the down link at central station, the double-sideband modulation signal comprises centered carrier and optical millimeter wave, optical millimeter wave and light center carrier wave are sent to the base station together, method by light filtering in the base station is separated optical millimeter wave with centered carrier, optical millimeter wave after the separation becomes wireless signal by antenna again and sends after becoming the signal of telecommunication by opto-electronic conversion.Light center carrier wave after the separation can be used as the light carrier of up link, thereby has avoided the use of the laser of costliness in the base station, makes architecture of base station become simply, and reduces cost.
In the communication of up link, at first utilize the light filtering mode that the center light carrier extract in the down link is come out as the light carrier of up link, the data-signal that will come from the up link of client portable terminal drives optical modulator, thereby the signal of up link is modulated on the center light carrier wave, is transmitted through the fiber to central station.
In order to realize purpose of the present invention, described in one embodiment full duplex fibre-optical radio communication system comprises:
Central station, it comprises: laser is used to produce the continuous wave laser of optical fiber communication appointment; External modulator is used to produce optical millimeter wave; The electricity frequency mixer is used for that data-signal and rf wireless signal are carried out mixing and produces electric millimeter-wave signal; Optical circulator is used for the optical millimeter wave of down link is sent to optical fiber, is same as also to be used for the separately light signal of receiving uplink, and sends in the receiver of the up link in the central station.
The base station, it comprises optical circulator, is used to receive optical millimeter wave and the center light carrier wave that sends over from central station, its another effect is to be used for receiving modulated the light signal of uplink data and to be sent to optical fiber; Optical interleaver separates centered carrier with optical millimeter wave; An image intensifer is used to amplify optical millimeter wave; An optical filter is used for optical millimeter wave is carried out filtering; A photodetector is used for optical millimeter wave is converted into electric millimeter wave; An electric amplifier is used to amplify electric millimeter wave, and a radio-frequency antenna is used for millimeter wave is emitted to atmosphere, and receives the data of the up link that comes from customer mobile terminal.An electric frequency mixer, the signal that is used for the portable terminal that antenna is received carries out coherent detection, thereby detects data-signal; An optical modulator is used for data-modulated with up link to the center light carrier wave.
Described central station is characterized in that comprising the following course of work:
The continuous wave light carrier that is produced assigned frequency by light source enters the single electrode intensity modulator, the base-band data signal of down link carries out mixing by electric frequency mixer and radiofrequency signal and obtains electric millimeter wave, the continuous wave light carrier that electricity millimeter wave driving single electrode intensity modulator produces light source is modulated and is obtained the double-sideband modulation signal, the frequency spectrum of double-sideband modulation signal comprises that center light carrier wave and double frequency single order sideband form the optical millimeter wave signal, and centered carrier then can be used as the carrier wave of up link.This double-sideband modulation signal is sent in the optical fiber by optical circulator.Optical circulator can receive the up link light signal that comes from the base station simultaneously, and sends in the optical receiver of up link.
Described base station is characterized in that comprising the following course of work:
Come from optical millimeter wave and the center light carrier wave that central station sends by the optical circulator reception, by the light filtering method centered carrier is separated with double frequency single order sideband, double frequency single order sideband signals after the separation enters photoelectric detector, double frequency single order sideband signals is by after the image intensifer filtering, in photoelectric detector, double frequency light produces beat signal, forms electric millimeter wave, by tele-release big after, launch by antenna again.The light center carrier wave that the light filtering method is separated will be modulated to uplink signal on the light carrier in external modulator as the light carrier of up link, sends to the optical circulator in the base station, sends to optical fiber link and transfers to central station by optical circulator.
The present invention utilizes the method for electric mixing to produce electric millimeter wave earlier, produces the double-sideband modulation signal by double-sideband modulation then, and wherein double frequency single order sideband produces optical millimeter wave.In the base station, adopt the light filtering mode that centered carrier is extracted light carrier as up link, saved photonic device, make that the ROF system configuration is simple, be easy to realize.
(4) description of drawings
Fig. 1 is a central station structural representation of the present invention
Fig. 2 is an architecture of base station schematic diagram of the present invention.
Fig. 3 is a full duplex fibre-optical radio communication system schematic diagram of the present invention;
Among the figure:
The 1-data source
The 2-radio-frequency signal generator
3-electricity frequency mixer
33-electricity frequency mixer
The 4-laser
The 5-optical modulator
6-central station optical circulator
66-base station optical circulator
7-up link optical receiver
The 8-optical interleaver
The 9-image intensifer
The 10-optical band pass filter
The 11-photoelectric detector
12-high-frequency electrical amplifier
The 13-antenna
The 14-optical modulator
The 15-central station
The 16-optical fiber link
The 17-base station
(5) embodiment
Below in conjunction with concrete experimental example and accompanying drawing, the present invention is specified.
By shown in Figure 1, each parts and the function of the central station of full duplex fibre-optical radio communication are respectively described below:
By shown in Figure 2, each parts and the function declaration of the base station of full duplex fibre-optical radio communication of the present invention are as follows:
Optical circulator 66 is used for the down link signal that passes through the optical fiber link transmission that the receiving center station sends and comprises optical millimeter wave signal and centered carrier.Another effect of optical circulator 66 is the light signal of receiving uplink and is sent to optical fiber link.Optical interleaver 8 is used for the optical millimeter wave signal is separated with centered carrier.Its output has two, one of them output output optical millimeter wave, another output output center carrier wave.Image intensifer 9 is used to amplify the optical millimeter wave signal of separating from optical interleaver, and optical band pass filter 10 is used for the optical millimeter wave signal is carried out filtering, and photoelectric detector 11 is used to produce electric millimeter wave.Electric amplifier 12 is used for electric millimeter wave is amplified, and antenna 13 is used for electric millimeter wave is launched.Electricity frequency mixer 33 is used for the data-signal of the up link that comes from customer mobile terminal that coherent detection receives from antenna, and optical modulator 14 is used for data-modulated with up link to centered carrier, and sends to the 3rd port of optical circulator 66.
Full duplex fibre-optical radio communication system of the present invention as shown in Figure 3.
Described full duplex fibre-optical radio communication system comprises central station 15, base station 17 and optical fiber link 16.
Central station 15 of the present invention, main effect is the data-signal that produces down link optical millimeter wave and center light carrier wave and reception and processing up link.Base station of the present invention, main effect is down link optical millimeter wave signal and the centered carrier that the receiving center station sends over, and optical millimeter wave is separated with centered carrier; Optical millimeter wave is converted into the signal of telecommunication and launches by antenna; To be modulated on the centered carrier from the uplink signal that mobile client receives and send to central station and handle.Base-station 17, its effect are the light signals between transmission center station and the base station.
The concrete connected mode of described full duplex fibre-optical radio communication system is as follows:
Second tie point of the optical circulator 6 in the central station 15 links to each other with Transmission Fibers link 16, and first port of the optical circulator 66 in the other end of Transmission Fibers link 16 and the base station 17 is connected.Transmission Fibers link 16 is monomode fiber SMF-28.
The connected mode of each parts in the central station 15 is: data source 1 links to each other with electric frequency mixer 3 usefulness cables;
Radio-frequency signal generator 2 links to each other with electric frequency mixer 3 usefulness cables; The output of electricity frequency mixer 3 links to each other with cable with the electrical input of optical modulator 5.All the other each parts are optical fiber and connect.
The frequency of the optical millimeter wave that described central station produces is 2 times of frequency of the radiofrequency signal that produces of radio frequency sine-wave generator 13.
The connected mode of each parts is as follows in the described base station:
Second port of optical circulator 66 is connected with optical interleaver.Optical interleaver 8 has two light output ends, the one output is an odd number wavelength output, what export is the center light carrier wave, be connected with the light input end of external modulator 14, by external modulator 14 with the data-modulated of up link to the center light carrier wave, external modulator 14 is connected with the 3rd port of optical circulator 66, and the light signal of up link is forwarded in the optical fiber link 16; The another one output of optical interleaver is an even number wavelength output, and the light signal of its output is an optical millimeter wave, is connected with the input of image intensifer 9, and the optical millimeter wave that is subjected to loss in optical fiber link obtains amplifying in image intensifer.The output of image intensifer 9 is connected with optical band pass filter 10, and optical millimeter wave is carried out filtering, suppresses the high frequency sideband.Light belt is connected with photoelectric detector 11 by the output of filter 10, and optical millimeter wave is converted to the signal of telecommunication, and the bifrequency sideband of optical millimeter wave will produce beat signal in photodetector, and frequency is 2fO, produces electric millimeter wave.Photodetector 11 can be PIN photodiode.Photodetector output 11 is connected with high-frequency electrical amplifier 12, and electric millimeter-wave signal is amplified.The output of electric amplifier 12 is connected with antenna 13.By antenna 13, electric millimeter-wave signal will become wireless signal and send.
The data of described up link come from the received portable terminal signal of antenna 13, and carry out coherent detection by electric frequency mixer 33 and obtain.Data-signal by the up link after electric frequency mixer 33 coherent detection is loaded into by optical modulator 14 and comes from the center light carrier wave that optical interleaver 8 separated.
Described base station among the present invention is suitable for the WDM Optical Fiber Transmission wireless signal that frequency is 1～40GHZ and other frequency.
The present invention has adopted electric frequency mixing method to produce electric millimeter wave in central station, and then produces optical millimeter wave through double-sideband modulation, has saved an optical modulator in central station.In addition, in the base station, adopt the light filtering mode to obtain the center light carrier wave, the data signal modulation of up link to light carrier, be need not to use light source in the base station, make that architecture of base station is simple, high stability and low cost.
In a word, advantage of the present invention is to reduce the cost of optical fiber radio communication system, so that the ROF system Overall structure is simple, reduces the quantity of employed components and parts as far as possible, and stable performance realizes easily.
Claims (5)
1, a kind of optical millimeter wave production method is used to the down link of ROF system to produce optical millimeter wave,
It is characterized in that described method may further comprise the steps:
Utilize electric frequency mixing method, baseband signal and radiofrequency signal are carried out mixing produce electric millimeter-wave signal.
The electricity millimeter-wave signal produces the double-sideband modulation signal by light modulator.
The double-sideband modulation signal comprises double frequency single order sideband and centered carrier.
The double frequency single order sideband of double-sideband modulation signal produces optical millimeter wave.
Centered carrier in the double-sideband modulation signal can be used as the light carrier of up link.
2, a kind of full duplex fibre-optical radio communication system, the method that can utilize above-mentioned optical millimeter wave to produce is carried out full-duplex communication.
3, according to right 2 described full-duplex wireless communication systems, it is characterized in that: comprise central station of the present invention and base station.
4, according to right 3 described central stations, base is characterised in that and utilizes right 1 described method to produce the double-sideband modulation signal, and described double-sideband modulation signal is sent in the base station.
5, according in the right 3 described base stations, the method that it is characterized in that utilizing light filtering is separated the double frequency single order sideband of double-sideband signal with the light center carrier wave.The bifrequency single order sideband signals that separates produces optical millimeter wave.With the data signal modulation of up link to the light center carrier wave.
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| CNA200610136716XA CN101001114A (en) | 2006-11-21 | 2006-11-21 | Full duplex fibre-optical radio communication system of simple structure |
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| CNA200610136716XA CN101001114A (en) | 2006-11-21 | 2006-11-21 | Full duplex fibre-optical radio communication system of simple structure |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951295A (en) * | 2010-09-09 | 2011-01-19 | 北京交通大学 | Millimeter wave (MMW) generator on basis of generating photocarrier SSB by phase shift method |
| CN101777953B (en) * | 2010-01-08 | 2012-10-24 | 西安电子科技大学 | Light double-sideband modulation device and method for transmitting two paths of signals |
| CN101715249B (en) * | 2009-12-07 | 2012-12-05 | 湖南工业大学 | Optical-fiber wireless system for full-duplex communication |
| CN105591698A (en) * | 2016-03-03 | 2016-05-18 | 苏州大学 | Radio-over-fiber method and system |
| CN108521300A (en) * | 2018-06-06 | 2018-09-11 | 东莞理工学院 | A kind of light-carried wireless radio frequency signal generating device and method |
| CN113452452A (en) * | 2021-06-24 | 2021-09-28 | 中国舰船研究设计中心 | Broadband high-sensitivity millimeter wave receiving system based on carrier suppression |
-
2006
- 2006-11-21 CN CNA200610136716XA patent/CN101001114A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101715249B (en) * | 2009-12-07 | 2012-12-05 | 湖南工业大学 | Optical-fiber wireless system for full-duplex communication |
| CN101777953B (en) * | 2010-01-08 | 2012-10-24 | 西安电子科技大学 | Light double-sideband modulation device and method for transmitting two paths of signals |
| CN101951295A (en) * | 2010-09-09 | 2011-01-19 | 北京交通大学 | Millimeter wave (MMW) generator on basis of generating photocarrier SSB by phase shift method |
| CN101951295B (en) * | 2010-09-09 | 2013-01-23 | 北京交通大学 | Millimeter wave (MMW) generator on basis of generating photocarrier SSB by phase shift method |
| CN105591698A (en) * | 2016-03-03 | 2016-05-18 | 苏州大学 | Radio-over-fiber method and system |
| CN105591698B (en) * | 2016-03-03 | 2018-06-29 | 苏州大学 | A kind of light carrier radio communication method and system |
| CN108521300A (en) * | 2018-06-06 | 2018-09-11 | 东莞理工学院 | A kind of light-carried wireless radio frequency signal generating device and method |
| CN108521300B (en) * | 2018-06-06 | 2023-06-16 | 东莞理工学院 | Device and method for generating optical-load wireless radio frequency signals |
| CN113452452A (en) * | 2021-06-24 | 2021-09-28 | 中国舰船研究设计中心 | Broadband high-sensitivity millimeter wave receiving system based on carrier suppression |
| CN113452452B (en) * | 2021-06-24 | 2022-09-20 | 中国舰船研究设计中心 | Broadband high-sensitivity millimeter wave receiving system based on carrier suppression |
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