CN101431373A - Signal processing method, junction centre, base station and network system - Google Patents
Signal processing method, junction centre, base station and network system Download PDFInfo
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- CN101431373A CN101431373A CNA2008102397049A CN200810239704A CN101431373A CN 101431373 A CN101431373 A CN 101431373A CN A2008102397049 A CNA2008102397049 A CN A2008102397049A CN 200810239704 A CN200810239704 A CN 200810239704A CN 101431373 A CN101431373 A CN 101431373A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
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- H04J14/0298—Wavelength-division multiplex systems with sub-carrier multiplexing [SCM]
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- H—ELECTRICITY
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- H04J14/0201—Add-and-drop multiplexing
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Abstract
The invention discloses a method for processing a signal, a junction station, a base station and a network system thereof. The method comprises the following steps: a subcarrier signal carrying communication data is subject to multiplexing processing; and the multiplexed subcarrier signal is transmitted, wherein the multiplexing processing comprises single subcarrier multiplexing, combination of subcarrier multiplexing and optical wavelength-division multiplexing, and combination of subcarrier multiplexing and optical add drop multiplexing. Only down link carrier wave is multiplexed during optical wavelength-division multiplexing; or, down link carrier wave and up link carrier wave can be simultaneously multiplexed. Through the embodiment of the invention, optical fiber wireless system capacity can be improved.
Description
Technical field
The present invention relates to the optical fiber radio communication technology, especially a kind of signal processing method, central station, base station and network system.
Background technology
The working frequency range of present most radio communication service all concentrates on below the 5GHz, existing low-frequency range frequency resource nearly all has been assigned with and has finished, the following operating frequency that needs to improve wireless carrier is to improve the capacity of wireless communication system, and the communication frequency that super wide wireless communication technology of future generation adopts will extend to millimere-wave band.Because the loss that absorption and reflection cause will obviously increase, transmission range will be restricted when but the electromagnetic wave of millimere-wave band was propagated in atmosphere; Simultaneously, the millimetre-wave attenuator device cost is higher, is unfavorable for personal communication; These effects limit the development of millimetre-wave attenuator technology.The introducing of optical fiber radio communication (Radio Over Fiber is called for short ROF) system can address the above problem preferably, and the ROF system comprises central station (Central Station is called for short CS), optical fiber link and base station; Descending high-speed data signal is modulated onto on the optical millimeter wave of CS generation, and the optical millimeter wave that has data sends to the base station by optical fiber, carries out opto-electronic conversion in the base station, converts optical millimeter wave to electric millimeter wave, and goes out by antenna transmission; In up link, the base station is carried out signal processing by Optical Fiber Transmission to central station after the upward signal that receives is carried out the electric light conversion.Because the loss of optical fiber is extremely low and capacity is big, and millimeter wave and high-speed data are modulated on the light carrier simultaneously, can prolong the transmission range of millimeter wave; And therefore the signal processing unit at each base station Sharing Center station has reduced the quantity of expensive signal processing unit, provides cost savings and simplified the structure of system.Therefore, the ROF system can make full use of the enormous bandwidth of optical fiber to reduce cost and the combining wireless network more flexible, wireless network and optical-fiber network merged to become a kind ofly can increase Access Network capacity and mobility, the novel access network that can cut operating costs again has broad prospects in the super wide wireless communication technology of the next generation.
In the super broad band radio communication network based on the optical-fiber wireless technology, no matter be,, all need to increase the quantity of base station still from the angle of system optimization from the effective angle of coverage of the high-quality of wireless signal.The inventor finds in realizing process of the present invention: the quantity of base station is very big in the optical fiber radio communication system, if corresponding increase number of fibers will increase the construction cost of network, therefore the utilization ratio that how to solve network between base station and the central station increases the network construction cost problem of bringing to control the base station effectively, has become problem demanding prompt solution.
Summary of the invention
The present invention provides a kind of signal processing method, central station, base station and network system, and in order to solve wireless system, optical-fiber wireless network for example is if the construction cost problem of higher that corresponding increase number of fibers is brought is increased in the base station.
The embodiment of the invention provides a kind of signal processing method, comprising:
The subcarrier signal that carries communication data is carried out multiplexing process;
Send the subcarrier signal after multiplexing.
The embodiment of the invention provides a kind of signal processing method, comprising:
Rectification carries the optical carrier of the single wavelength of subcarrier signal, obtains multiplexing subcarrier signal;
The described multiplexing subcarrier signal of demultiplexing obtains each subcarrier signal.
The embodiment of the invention provides a kind of central station, comprising:
Multiplexing module is used for the subcarrier signal that carries communication data is carried out multiplexing process;
Sending module is used to send the subcarrier signal after multiplexing.
The embodiment of the invention provides a kind of base station, comprising:
Demodulation module is used for the optical carrier that rectification carries the single wavelength of subcarrier signal, obtains multiplexing subcarrier signal;
Demultiplexing module is used for the described multiplexing subcarrier signal of demultiplexing, obtains each subcarrier signal.
The embodiment of the invention provides a kind of network system, comprising:
First central station is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Each subcarrier signal is modulated on the light carrier of single wavelength and obtains optical carrier;
First base station, corresponding with the light carrier of described single wavelength, be used for described optical carrier is carried out photoelectrolysis modulation and the processing of subcarrier demultiplexing.
The embodiment of the invention also provides a kind of network system, comprising:
Second central station is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Each subcarrier signal is modulated to respectively on the descending light carrier of different wave length, obtains the descending optical carrier of each correspondence; Each descending optical carrier is carried out optical wavelength-division multiplex handle, obtain the optical carrier after multiplexing;
Light wave decomposition multiplex device is used for that described optical carrier after multiplexing is carried out demultiplexing and handles, and obtains each descending optical carrier;
Second base station, corresponding with described each descending optical carrier, be used for the corresponding downstream optical carrier is carried out photoelectrolysis modulation and the processing of subcarrier demultiplexing.
The embodiment of the invention also provides a kind of network system, comprising:
The 3rd central station is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Each subcarrier signal is modulated to respectively on the descending light carrier of different wave length, obtains the descending optical carrier of each correspondence; Up light carrier and each descending optical carrier of producing are carried out the optical wavelength-division multiplex processing.
The 3rd base station is used for that described descending optical carrier is carried out Optical Add Drop Multiplexer, photoelectrolysis modulation and subcarrier demultiplexing and handles.
As shown from the above technical solution, the embodiment of the invention is carried out multiplexing process by the subcarrier signal that carries data-signal that needs is transferred to each base station, needs can be transferred to each signal of base station is multiplexed in the optical fiber, realize that by the mode that improves power system capacity the base station increases and do not increase the quantity of optical fiber, to optimize network configuration, reduce system cost.
Description of drawings
Fig. 1 is the method flow schematic diagram of first embodiment of the invention;
Fig. 2 is the method flow schematic diagram of second embodiment of the invention;
Fig. 3 is the schematic network structure of Fig. 2 correspondence;
Fig. 4 is the method flow schematic diagram of third embodiment of the invention;
Fig. 5 is the schematic network structure of Fig. 4 correspondence;
Fig. 6 is the method flow schematic diagram of fourth embodiment of the invention;
Fig. 7 is the schematic network structure of Fig. 6 correspondence;
Fig. 8 is the structural representation of the central station of fifth embodiment of the invention;
Fig. 9 is the structural representation of the base station of sixth embodiment of the invention;
Figure 10 is the structural representation of the system of seventh embodiment of the invention;
Figure 11 is the structural representation of the system of eighth embodiment of the invention;
Figure 12 is the structural representation of the system of ninth embodiment of the invention.
Embodiment
Fig. 1 is the method flow schematic diagram of first embodiment of the invention, comprising:
Step 11: sending ending equipment, for example the central station in the optical-fiber wireless network carries out multiplexing process to the subcarrier signal that carries communication data.Wherein, subcarrier is radio frequency/millimeter wave that central station produces.Because existing signal carrier mainly concentrates on low-frequency range, causes the low-frequency resources anxiety, also need to pay very big cost even adopt; And radio frequency/millimeter wave belongs to high frequency, its operable communications band is very wide, for example, in the millimeter-wave systems of 60GHz, have the frequency range about about 7GHz freely freely to use, so present embodiment adopt the carrier wave of radio frequency/millimeter wave (subcarrier) as the carrying communication data.
Step 12: this sending ending equipment sends subcarrier signal after multiplexing to receiving device, for example the base station in the optical-fiber wireless network.
Present embodiment can improve power system capacity by carrying out multiplexing process, and then can optimize the network configuration between transmitting terminal and the receiving terminal, realizes the reduction of cost.
Fig. 2 is the method flow schematic diagram of second embodiment of the invention, and Fig. 3 is the schematic network structure of Fig. 2 correspondence.Present embodiment comprises:
Step 21: transmitting terminal, for example the central station in the optical fiber radio communication system produces the radio frequency/millimeter-wave signal (being subcarrier) of different frequency and the light carrier of a certain single wavelength, and the frequency of each subcarrier is respectively f
SC1, f
SC2..., f
SCm, the wavelength of this light carrier is respectively λ
1Fig. 3 is an example with the two-way subcarrier.
Step 22: by electric modulator, subcarrier is by the data-modulated of respective channel, obtains carrying the subcarrier signal of the data of respective channel.For example, referring to Fig. 3, it is f that the data of passage 1 are used for modulating frequency
SC1Subcarrier, it is f that the data of passage 2 are used for modulating frequency
SC2Subcarrier.
Step 23: by optical modulator or directly modulated laser each road subcarrier signal is modulated on the light carrier of this single wavelength simultaneously, thereby realize multichannel subcarrier signal multiplexing in same light carrier.For example, referring to Fig. 3, it is λ that the two-way subcarrier signal is modulated to wavelength simultaneously
1(corresponding frequency is f
0) light carrier on.
The subcarrier multiplexing of present embodiment is to be that the subcarrier signal of telecommunication that frequency is higher is modulated on the light signal, is analog signal is modulated on the carrier wave of high frequency more, so the modulation of comparative figures signal, sub-carrier modulation requires bigger bandwidth.And in the light territory subcarrier multiplexing of present embodiment each subcarrier signal is modulated on the light carrier, light carrier can provide the bandwidth of THz magnitude, therefore can multiplexing relatively large subcarrier signal of while.
The optical modulator of present embodiment can adopt existing, but because present optical modulator mainly is used for optical communication technique, that is to say to be used for modulated digital signal, comprises bandwidth and extinction ratio etc. at this main performance index of using optical modulator; And if optical modulator is used for modulated analog signal, then except bandwidth and extinction ratio, also needs the linear very good of modulator.Therefore, though existing optical modulator can be used for modulated analog signal, in order to realize that performance can be done further optimal design to the linearity at this application better, the specific design scheme can be with reference to existing linearity optimization scheme.
Step 24: with multiplexing subcarrier signal on single light carrier, send to receiving terminal, for example the base station of this light carrier correspondence in the optical fiber radio communication system by optical fiber.
Step 25: at receiving terminal, utilize the method for photo-detector direct detection to carry out opto-electronic conversion, can finish the rectification of the multichannel subcarrier signal that is modulated on the light carrier so simultaneously.
Step 26: the demultiplexing of realizing subcarrier signal through filter filtering, in order to improve the transmission of signal in wireless environment, can adopt the method that strengthens transmitting power, promptly can after radio frequency/millimeter wave amplifier amplifies, directly be fed to antenna further and launch.
Present embodiment adopts light territory subcarrier multiplexing, and the frequency range that light carrier wherein can be selected is very wide, therefore can make full use of and freely use frequency range under the existence conditions, for example can make full use of in the 60GHz millimeter-wave systems freely to use frequency range about 7GHz.Simultaneously, the signal of each passage can adopt various different modulating forms to be modulated on the subcarrier, therefore can carry various wideband communications service.And, need not clock synchronization and fast sampling, simple in structure, cost is lower.
Fig. 4 is the method flow schematic diagram of third embodiment of the invention, and Fig. 5 is the schematic network structure of Fig. 4 correspondence.Present embodiment comprises:
Step 41: at transmitting terminal, utilize subcarrier multiplexing, (frequency is respectively f with the subcarrier of two-way at least
SC1, f
SC2..., f
SCm) be modulated to simultaneously respectively that (wavelength is λ on the light carrier of single wavelength
1Or λ
2... or λ
n).The specific implementation that the multichannel subcarrier signal is modulated on the light carrier of a certain single wavelength simultaneously can be referring to the implementation of embodiment two.
Step 42: at transmitting terminal, (wavelength is respectively λ to carry the light carrier of the subcarrier signal of two-way at least separately
1, λ
2..., λ
n), wherein each light carrier is corresponding with the base station, is λ as wavelength
1Light carrier will receive handle by first base station.The light carrier that respectively carries subcarrier signal is realized wavelength division multiplexing by light wavelength division multiplexing (or claiming wave multiplexer), obtains the subcarrier signal after multiplexing.Because M road subcarrier signal is multiplexed on the light carrier on N road respectively, so behind the wavelength division multiplexing, transmit the signal that M * N road is arranged in the optical fiber altogether.
Particularly, carrying out multiplexing subcarrier signal in the present embodiment is analog signal, and therefore compared with prior art, big bandwidth all is the specific (special) requirements to necessity of device and system.All the lay special stress on channel spacing is little to be applied at present wavelength division multiplexer on the optical transmission in the optical communication technique, promptly so-called close wavelength-division multiplex technology; And present embodiment need require to have between each passage of wavelength division multiplexer enough intervals can isolate two adjacency channels of the subcarrier signal that carries big bandwidth well, needs to use the Coarse Wavelength Division Multiplexing technology.
In transmission course, can use fiber amplifier that light signal is amplified, thereby strengthen the link gain of radio frequency/millimeter-wave signal.
Step 43: the multichannel light carrier of transmitting terminal after with optical wavelength-division multiplex merges to be sent into an optical fiber and transmits.Because the optical carrier of different wave length can be regarded mutual independence as, thereby can realize the multiplexing transmission of multichannel optical carrier in an optical fiber.
Step 44: at receiving terminal, use carrying that light wave decomposition multiplex device (or claiming channel-splitting filter) will have a different wave length at least the subcarrier of two-way light carrier separately, realize the demultiplexing of multichannel light carrier.Each light carrier behind the demultiplexing is λ with being admitted to respectively in the corresponding base station as wavelength
1Light carrier be admitted to first base station, wavelength is λ
nLight carrier be admitted to the N base station.
The frequency that is multiplexed into each the road subcarrier signal on the light carrier of single wavelength is inequality, and the frequency that is carried on each the road subcarrier signal on the light carrier of any two different wave lengths can be identical or inequality.Light wavelength division multiplexing/demodulation multiplexer can be integrated-type light wavelength division multiplexing/demodulation multiplexer, optical-fiber type optical multiplexer/demodulation multiplexer and film-type optical multiplexer/demodulation multiplexer etc.
Step 45: in each receiving terminal (base station), carry out opto-electronic conversion by the method for using the photo-detector direct detection, finish the rectification of the subcarrier that is modulated to the two-way at least on this wavelength light carrier wave simultaneously, behind filter filtering, realize the demultiplexing of subcarrier, after radio frequency/millimeter wave amplifier amplifies, directly be fed to antenna and launch.Concrete can be referring to light carrier rectification and the subcarrier demultiplexing of embodiment two.
Present embodiment carries out optical wavelength-division multiplex further on the basis of embodiment two subcarrier multiplexings.Adopt light WDM technology can make full use of the huge bandwidth resources of optical fiber, do not need existing transmission line upgraded and just can increase the message capacity of system effectively, be that an optical fiber can still be used when increasing in the base station, the light carrier of each base station correspondence all is multiplexed in this optical fiber.Can carry out dynamic optimization to the light carrier of each base station by present embodiment distributes, make light carrier carry different subcarrier signals as required, not needing when increasing in the base station to increase optical fiber, realization is the simplified system network topology structure greatly, make things convenient for the upgrading of system and service, realize effective management simultaneously network.
Among above-mentioned Fig. 2 and the embodiment shown in Figure 4, the light carrier that transmitting terminal (as central station) sends is descending light carrier, can also generate up light carrier by central station, and up light carrier and descending optical carrier are multiplexed in the optical fiber simultaneously; At receiving terminal (as the base station) upstream data that receives is modulated on this up light carrier and sends to central station.Perhaps, central station does not generate up light carrier, and each base station generates up light carrier separately respectively, in order to modulate corresponding upstream data.That is, produce the light source of up light carrier, the light source that produces descending light carrier can be concentrated and be arranged in the central station, also can be that the light source that produces descending light carrier only is set in the central station, and the light source that will produce up light carrier is arranged in the base station.
Fig. 6 is the method flow schematic diagram of fourth embodiment of the invention, and Fig. 7 is the schematic network structure of Fig. 6 correspondence.Present embodiment comprises:
Step 61: at transmitting terminal, the light carrier with different wave length that all (need be transferred to each base station) are used for the uplink and downlink link advances optical fiber by wavelength division multiplexer is compound.Wherein the light carrier of the down link that is useful on is modulated by the corresponding one group of descending subcarrier signal that has been carried data separately, promptly realized subcarrier signal multiplexing on light carrier, represented with the triangle of filling that this carries the light carrier of data among Fig. 7 as embodiment three; The light carrier of the up link that is useful on then keeps unmodulated state to use for the upward signal of corresponding each base station, represents unmodulated light carrier with unfilled triangle among Fig. 7.
Step 62: the uplink and downlink optical carrier of transmitting terminal after with optical wavelength-division multiplex sends to receiving terminal.
Step 63: at receiving terminal, the optical add/drop multiplexer (OADM) in base station (BS) selects a pair of unmodulated up/modulated descending light wave with specific wavelength corresponding with this base station to send in the optical transceiver (EAT), and for example, first base station is λ with a pair of wavelength
1Descending/up light carrier choose.
Step 64: optical transceiver carries out realizing being modulated to after the opto-electronic conversion subcarrier demultiplexing of the multichannel different frequency on this wavelength light carrier wave to the modulated light wave, and the amplifier of respectively hanging oneself amplifies back (representing descending radio frequency/millimeter-wave signal with the arrow of filling among Fig. 7) by aerial radiation.Simultaneously, the upstream data (as up radio frequency/millimeter-wave signal of representing with unfilled arrow among Fig. 7) that the base station is received number is modulated with this unmodulated up light carrier, reenters optical ring network by optical add/drop multiplexer then and sends central station back to.Be that optical transceiver has to descending rectification with to the double action of up modulation.
Optical transceiver in the base station can be electric absorption type optical transceiver, also can be the optical transceiver of being made up of an optical modulator (up light carrier is sent into this optical modulator) and a photo-detector (descending light carrier is sent into this photo-detector).Optical add/drop multiplexer can be integrated-type optical add/drop multiplexer or optical-fiber type add-drop multiplexer etc.
Present embodiment adopts the Optical Add Drop Multiplexer technology, can realize that central station adopts the direct-connected mode of single fiber to form the loop network topological structure to a plurality of base stations, all required light sources are all concentrated and are placed in the central station in the system, each base station need not to dispose light source, has controlled network construction cost effectively.Simultaneously, if the optical transceiver in the base station is an electric absorption type optical transceiver, can realize the multichannel subcarrier signal is modulated to modulation function on the light carrier of single wavelength, and can also realize to be modulated to the demodulation function of the subcarrier signal demultiplexing on the light carrier of single wavelength, can simplify the structure of base station greatly like this, reducing the construction costs.
Up light carrier and descending light carrier produce by central station in the present embodiment, and present embodiment can also be that central station produces descending light carrier, and up light carrier is produced separately by each base station.The light source that promptly produces up light carrier can all be arranged on central station with the light source that produces descending light carrier, also can discretely be arranged on central station and base station.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.
Fig. 8 is the structural representation of the central station of fifth embodiment of the invention, comprises Multiplexing module 81 and sending module 82.Multiplexing module 81 is used for the subcarrier signal that carries communication data is carried out multiplexing process; Sending module 82 is used to send the subcarrier signal after multiplexing.
Wherein, Multiplexing module 81 can comprise electric modulator and optical modulator/direct modulated laser; Described electric modulator is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Described optical modulator/directly modulated laser is used for each subcarrier signal is modulated to the light carrier of single wavelength; Perhaps
Multiplexing module 81 can comprise electric modulator, optical modulator/direct modulated laser and light wavelength division multiplexing; Described electric modulator is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Described optical modulator/directly modulated laser is used for each subcarrier signal is modulated to the light carrier of different wave length, obtains each corresponding optical carrier; Described light wavelength division multiplexing is used for that each optical carrier is carried out optical wavelength-division multiplex to be handled; Perhaps
Multiplexing module 81 can comprise electric modulator, optical modulator/direct modulated laser and light wavelength division multiplexing; Described electric modulator is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Described optical modulator/directly modulated laser is used for each subcarrier signal is modulated to the descending light carrier of different wave length, obtains the descending optical carrier of each correspondence; Described light wavelength division multiplexing is used for up light carrier and described descending optical carrier are carried out the optical wavelength-division multiplex processing.
By present embodiment subcarrier signal is carried out multiplexing process, can improve the capacity of system.
Fig. 9 is the structural representation of the base station of sixth embodiment of the invention, comprises demodulation module 91 and demultiplexing module 92.Demodulation module 91 is used for the light carrier that rectification carries the single wavelength of subcarrier signal, obtains multiplexing subcarrier signal; Demultiplexing module 92 is used for the described multiplexing subcarrier signal of demultiplexing, obtains each subcarrier signal.
Perhaps, this base station further comprises optical add/drop multiplexer, be used to receive after the optical wavelength-division multiplex to optical carrier that should the base station, described optical carrier comprises descending optical carrier, and described descending optical carrier is sent to described demodulation module.The light carrier that described optical add/drop multiplexer receives also comprises up light carrier, and perhaps, described base station also comprises the light carrier generation module, and described light carrier generation module is used to generate up light carrier; This base station also comprises modulation module, and the upstream data that described modulation module is used for receiving is modulated to up light carrier reception or that generate, and sends by described optical add/drop multiplexer.
Perhaps, above-mentioned demodulation module and modulation module are substituted by optical transceiver, by the dual-use function of optical transceiver according to descending/up realization rectification and modulation.
By present embodiment, central station can be sent multiplexing after the correct demultiplexing of signal and rectification after obtain should signal of base station.
Figure 10 is the structural representation of the system of seventh embodiment of the invention, comprises first central station 101 and first base station 102.The communication data that first central station 101 is used for each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal, and each subcarrier signal is modulated on the light carrier of single wavelength and obtains optical carrier; First base station 102 is corresponding with the light carrier of described single wavelength, is used for described optical carrier is carried out photoelectrolysis modulation and the processing of subcarrier demultiplexing.Concrete, described first central station 101 comprises electric modulator and optical modulator/direct modulated laser; Described first base station 102 comprises photo-detector and filter.Wherein, be provided with descending light carrier generation module in first central station 101, be used to produce the light carrier that above-mentioned modulation has subcarrier signal.Further can also be provided with up light carrier generation module in this first central station 101, be used to produce up light carrier, first central station 101 has the light carrier of subcarrier signal to send to first base station 102 simultaneously up light carrier and above-mentioned modulation; Perhaps, first base station 102 is provided with this up light carrier generation module that is used to produce up light carrier; First base station, 102 usefulness send to first central station 101 after being modulated to the upstream data that receives on up light carrier reception or that self produce.
Present embodiment is realized subcarrier multiplexing by first central station, can improve the quantity of the subcarrier signal that is transferred to first base station, realizes the raising of capacity between first central station and first base station.
Figure 11 is the structural representation of the system of eighth embodiment of the invention, comprises second central station 111, light wave decomposition multiplex device 112 and second base station 113.Second central station 111 is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Each subcarrier signal is modulated to respectively on the descending light carrier of different wave length, obtains the descending optical carrier of each correspondence; Each descending optical carrier is carried out optical wavelength-division multiplex handle, obtain the optical carrier after multiplexing; Light wave decomposition multiplex device 112 is used for that described optical carrier after multiplexing is carried out demultiplexing to be handled, and obtains each descending optical carrier; Second base station 113 is at least one, and is corresponding with described each descending optical carrier, is used for the corresponding downstream optical carrier is carried out photoelectrolysis modulation and the processing of subcarrier demultiplexing; Generate up light carrier, the upstream data that receives is modulated on the up light carrier.
Perhaps, described second central station 111 also is used to produce corresponding paired up light carrier with descending light carrier, and up light carrier and descending optical carrier are carried out the optical wavelength-division multiplex processing simultaneously; Described light wave decomposition multiplex device 112 is used for the demultiplexing light carrier, obtains each paired up light carrier and descending optical carrier; Described second base station 113 is corresponding with each paired up light carrier and descending optical carrier, is used for the corresponding downstream optical carrier is carried out photoelectrolysis modulation and subcarrier demultiplexing, and the upstream data that receives is modulated on the up light carrier
Concrete, described second central station 111 comprises electric modulator, optical modulator/direct modulated laser and light wavelength division multiplexing and descending light carrier generation module; Described second base station 113 comprises photo-detector and filter and up light carrier generation module.Perhaps, described second central station 111 comprises electric modulator, optical modulator/direct modulated laser and light wavelength division multiplexing and descending light carrier generation module and up light carrier generation module; Described second base station 113 comprises photo-detector and filter.
Present embodiment can be realized subcarrier multiplexing and optical wavelength-division multiplex, and can realize separating wavelength division multiplexing by light wave decomposition multiplex device.The light source of up light carrier can be arranged in the central station, also can be arranged in the base station.
Figure 12 is the structural representation of the system of ninth embodiment of the invention, comprises the 3rd central station 121 and the 3rd base station 122.The 3rd central station 121 is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Each subcarrier signal is modulated to respectively on the descending light carrier of different wave length, obtains the descending optical carrier of each correspondence; Up light carrier and each descending optical carrier of producing are carried out the optical wavelength-division multiplex processing.The 3rd base station 122 is corresponding with descending light carrier, is at least one, is used for that described descending optical carrier is carried out Optical Add Drop Multiplexer, photoelectrolysis modulation and subcarrier demultiplexing and handles; Be used to produce up light carrier, the upstream data that receives is modulated on the up light carrier.
Perhaps, described the 3rd central station 121 also is used to produce corresponding paired up light carrier with descending light carrier, and up light carrier and descending optical carrier are carried out the optical wavelength-division multiplex processing simultaneously; Carrying out optical wavelength-division multiplex after described the 3rd base station 122 also is used for the up light carrier that receives modulated with upstream data handles.
Concrete, described the 3rd central station 121 comprises electric modulator, optical modulator/direct modulated laser and light wavelength division multiplexing and descending light carrier generation module; Described the 3rd base station 122 comprises optical add/drop multiplexer, optical transceiver and filter and up light carrier generation module.Perhaps, described the 3rd central station 121 comprises electric modulator, optical modulator/direct modulated laser and light wavelength division multiplexing and descending light carrier generation module and up light carrier generation module; Described the 3rd base station 122 comprises optical add/drop multiplexer, optical transceiver and filter.
Present embodiment can be realized subcarrier multiplexing and optical wavelength-division multiplex and Optical Add Drop Multiplexer, and can realize separating wavelength division multiplexing by optical add/drop multiplexer.The light source of up light carrier can be arranged in the central station, also can be arranged in the base station.
Embodiments of the invention can improve its capacity by adopting multiplex technique, improve the utilization ratio of transmitting terminal and receiving terminal, reducing the construction costs.
It should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not limit it, although the present invention is had been described in detail with reference to preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement technical scheme of the present invention, and these modifications or be equal to replacement and also can not make amended technical scheme break away from the spirit and scope of technical solution of the present invention.
Claims (25)
1, a kind of signal processing method is characterized in that, comprising:
The subcarrier signal that carries communication data is carried out multiplexing process;
Send the subcarrier signal after multiplexing.
2, method according to claim 1 is characterized in that, describedly the subcarrier signal that carries communication data is carried out multiplexing process comprises:
The communication data of each channel is modulated at respectively on the corresponding subcarrier, obtains each corresponding subcarrier signal; Each subcarrier signal is modulated on the light carrier of single wavelength, obtains being carried on the subcarrier signal after multiplexing on the light carrier of single wavelength; Perhaps,
The communication data of each channel is modulated at respectively on the corresponding subcarrier, obtains each corresponding subcarrier signal; Each subcarrier signal is modulated to respectively on the descending light carrier of different wave length of corresponding different base station, obtains the descending optical carrier of each correspondence; Each descending optical carrier is carried out optical wavelength-division multiplex handle, obtain the subcarrier signal after multiplexing; Perhaps,
The communication data of each channel is modulated at respectively on the corresponding subcarrier, obtains each corresponding subcarrier signal; Be specified to right up light carrier and descending light carrier; Each subcarrier signal is modulated to respectively on the descending light carrier of different wave length of corresponding different base station, obtains the descending optical carrier of each correspondence; Each up light carrier and each descending optical carrier are carried out optical wavelength-division multiplex handle, obtain the subcarrier signal after multiplexing.
3, a kind of signal processing method is characterized in that, comprising:
Rectification carries the optical carrier of the single wavelength of subcarrier signal, obtains multiplexing subcarrier signal;
The described multiplexing subcarrier signal of demultiplexing obtains each subcarrier signal.
4, method according to claim 3 is characterized in that, also comprises:
The described optical carrier that the receiving center station sends; Perhaps,
Receive the described optical carrier that light wave decomposition multiplex device sends; Perhaps,
Receive the described optical carrier that optical add/drop multiplexer sends.
5, method according to claim 4 is characterized in that, the described optical carrier that described reception light wave decomposition multiplex device sends comprises:
The optical carrier that light wave decomposition multiplex device receiving center station sends after multiplexing, described optical carrier after multiplexing is made up of the descending optical carrier of corresponding each base station;
The described optical carrier after multiplexing of light wave decomposition multiplex device demultiplexing obtains the descending optical carrier of corresponding each base station;
Light wave decomposition multiplex device sends to corresponding base station with the descending optical carrier of each base station of described correspondence.
6, method according to claim 4 is characterized in that, the described optical carrier that described reception light wave decomposition multiplex device sends comprises:
The optical carrier that light wave decomposition multiplex device receiving center station sends after multiplexing, described optical carrier after multiplexing is made up of the paired up light carrier and the descending optical carrier of corresponding each base station;
The described optical carrier after multiplexing of light wave decomposition multiplex device demultiplexing obtains the paired up light carrier and the descending optical carrier of corresponding each base station;
Light wave decomposition multiplex device sends to corresponding base station with the paired up light carrier and the descending optical carrier of each base station of described correspondence.
7, method according to claim 4 is characterized in that, the described optical carrier that described reception optical add/drop multiplexer sends comprises:
The optical carrier that optical add/drop multiplexer receiving center station in the base station sends after multiplexing, described optical carrier after multiplexing is made up of the descending optical carrier of corresponding each base station;
The described optical carrier after multiplexing of described optical add/drop multiplexer demultiplexing obtains descending optical carrier that should the base station;
Described optical add/drop multiplexer sends to photodetector in the base station with described to descending optical carrier that should the base station.
8, method according to claim 4 is characterized in that, the described optical carrier that described reception optical add/drop multiplexer sends comprises:
The optical carrier that optical add/drop multiplexer receiving center station in the base station sends after multiplexing, described optical carrier after multiplexing is made up of the paired up light carrier and the descending optical carrier of corresponding each base station;
The described optical carrier after multiplexing of described optical add/drop multiplexer demultiplexing obtains paired up light carrier and descending optical carrier that should the base station;
Described optical add/drop multiplexer sends to photodetector in the base station with described to descending optical carrier that should the base station.
9, according to claim 5 or 7 described methods, it is characterized in that, also comprise:
The base station generates up light carrier, and the upstream data that receives is modulated on the up light carrier that the base station generates sends.
10, according to claim 6 or 8 described methods, it is characterized in that, also comprise:
The base station receives upstream data, and the upstream data that receives is modulated on the described up light carrier of reception.
11, a kind of central station is characterized in that, comprising:
Multiplexing module is used for the subcarrier signal that carries communication data is carried out multiplexing process;
Sending module is used to send the subcarrier signal after multiplexing.
12, central station according to claim 11 is characterized in that:
Described Multiplexing module comprises electric modulator and optical modulator/direct modulated laser; Described electric modulator is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; The modulated laser of described optical modulator/directly is used for each subcarrier signal is modulated to the subcarrier signal that obtains on the light carrier of single wavelength after multiplexing; Perhaps,
Described Multiplexing module comprises electric modulator, optical modulator/direct modulated laser and light wavelength division multiplexing; Described electric modulator is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Described optical modulator/directly modulated laser is used for each subcarrier signal is modulated to the descending light carrier of the different wave length of corresponding different base station, obtains the descending optical carrier of each correspondence; Described light wavelength division multiplexing is used for that each descending optical carrier is carried out optical wavelength-division multiplex and handles the subcarrier signal obtain after multiplexing; Perhaps,
Described Multiplexing module comprises electric modulator, optical modulator/direct modulated laser and light wavelength division multiplexing; Described electric modulator is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Described optical modulator/directly modulated laser is used for each subcarrier signal is modulated to the descending light carrier of the different wave length of corresponding different base station, obtains the descending optical carrier of each correspondence; Described light wavelength division multiplexing is used for corresponding with described descending light carrier paired up light carrier that described central station is generated and described descending optical carrier to carry out the optical wavelength-division multiplex processing and obtains subcarrier signal after multiplexing.
13, a kind of base station is characterized in that, comprising:
Demodulation module is used for the optical carrier that rectification carries the single wavelength of subcarrier signal, obtains multiplexing subcarrier signal;
Demultiplexing module is used for the described multiplexing subcarrier signal of demultiplexing, obtains each subcarrier signal.
14, base station according to claim 13 is characterized in that, also comprises:
Optical add/drop multiplexer is used for the optical carrier after the optical wavelength-division multiplex that the demultiplexing central station sends, obtains descending optical carrier that should the base station, and described descending optical carrier is sent to described demodulation module;
The light carrier generation module is used to generate up light carrier;
Modulation module is used to receive upstream data, and described upstream data is modulated on the up light carrier of described generation, and sends by described optical add/drop multiplexer.
15, base station according to claim 13 is characterized in that, also comprises:
Optical add/drop multiplexer is used for the optical carrier after the optical wavelength-division multiplex that the demultiplexing central station sends, obtains up light carrier and descending optical carrier that should the base station, and described descending optical carrier is sent to described demodulation module;
Modulation module is used to receive upstream data, and described upstream data is modulated on the described up light carrier that obtains, and sends by described optical add/drop multiplexer.
16, a kind of network system is characterized in that, comprising:
First central station is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Each subcarrier signal is modulated on the light carrier of single wavelength and obtains optical carrier;
First base station, corresponding with the light carrier of described single wavelength, be used for described optical carrier is carried out photoelectrolysis modulation and the processing of subcarrier demultiplexing.
17, system according to claim 16 is characterized in that:
Described first central station comprises electric modulator and optical modulator/direct modulated laser;
Described first base station comprises photo-detector and filter.
18, a kind of network system is characterized in that, comprising:
Second central station is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Each subcarrier signal is modulated to respectively on the descending light carrier of different wave length, obtains the descending optical carrier of each correspondence; Each descending optical carrier is carried out optical wavelength-division multiplex handle, obtain the optical carrier after multiplexing;
Light wave decomposition multiplex device is used for that described optical carrier after multiplexing is carried out demultiplexing and handles, and obtains each descending optical carrier;
Second base station, corresponding with described each descending optical carrier, be used for the corresponding downstream optical carrier is carried out photoelectrolysis modulation and the processing of subcarrier demultiplexing.
19, system according to claim 18 is characterized in that:
Described second central station also is used to produce corresponding paired up light carrier with descending light carrier, and up light carrier and descending optical carrier are carried out the optical wavelength-division multiplex processing simultaneously;
Described light wave decomposition multiplex device is used for the demultiplexing light carrier, obtains each paired up light carrier and descending optical carrier;
Described second base station is corresponding with each paired up light carrier and descending optical carrier, is used for the corresponding downstream optical carrier is carried out photoelectrolysis modulation and subcarrier demultiplexing, and the upstream data that receives is modulated on the up light carrier.
20, system according to claim 18 is characterized in that:
Described second central station comprises electric modulator, optical modulator/direct modulated laser and light wavelength division multiplexing and descending light carrier generation module; Described second base station comprises photo-detector and filter and up light carrier generation module.
21, system according to claim 19 is characterized in that:
Described second central station comprises electric modulator, optical modulator/direct modulated laser and light wavelength division multiplexing and descending light carrier generation module and up light carrier generation module;
Described second base station comprises photo-detector and filter.
22, a kind of network system is characterized in that, comprising:
The 3rd central station is used for the communication data of each channel is modulated at corresponding subcarrier respectively, obtains each corresponding subcarrier signal; Each subcarrier signal is modulated to respectively on the descending light carrier of different wave length, obtains the descending optical carrier of each correspondence; Up light carrier and each descending optical carrier of producing are carried out the optical wavelength-division multiplex processing.
The 3rd base station is used for that described descending optical carrier is carried out Optical Add Drop Multiplexer, photoelectrolysis modulation and subcarrier demultiplexing and handles.
23, system according to claim 22 is characterized in that:
Described the 3rd central station also is used to produce corresponding paired up light carrier with descending light carrier, and up light carrier and descending optical carrier are carried out the optical wavelength-division multiplex processing simultaneously;
Carrying out optical wavelength-division multiplex after described the 3rd base station also is used for the up light carrier that receives or produce modulated with upstream data handles.
24, system according to claim 22 is characterized in that:
Described the 3rd central station comprises electric modulator, optical modulator/direct modulated laser and light wavelength division multiplexing and descending light carrier generation module;
Described the 3rd base station comprises optical add/drop multiplexer, optical transceiver and filter and up light carrier generation module.
25, system according to claim 23 is characterized in that:
Described the 3rd central station comprises electric modulator, optical modulator/direct modulated laser and light wavelength division multiplexing and descending light carrier generation module and up light carrier generation module;
Described the 3rd base station comprises optical add/drop multiplexer, optical transceiver and filter.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CNA2008102397049A CN101431373A (en) | 2008-12-15 | 2008-12-15 | Signal processing method, junction centre, base station and network system |
| PCT/CN2009/075436 WO2010069235A1 (en) | 2008-12-15 | 2009-12-09 | Method for signal processing, central station, base station and network system |
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| CNA2008102397049A CN101431373A (en) | 2008-12-15 | 2008-12-15 | Signal processing method, junction centre, base station and network system |
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| WO (1) | WO2010069235A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010069235A1 (en) * | 2008-12-15 | 2010-06-24 | 华为技术有限公司 | Method for signal processing, central station, base station and network system |
| CN102427440A (en) * | 2011-08-25 | 2012-04-25 | 清华大学 | Photon-assisted multi-channel compression sampling (CS) system and method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114024646B (en) * | 2021-10-27 | 2024-06-25 | 中航光电科技股份有限公司 | Redundant interconnected star carrier division multiplexing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7340183B2 (en) * | 1998-11-17 | 2008-03-04 | Broadwing Corporation | Optical communications systems, devices, and methods |
| EP1087547A3 (en) * | 1999-09-24 | 2004-01-14 | Lucent Technologies Inc. | Terminal design for a WDM system with in-line semiconductor optical amplifiers |
| CN100377514C (en) * | 2003-02-19 | 2008-03-26 | 华为技术有限公司 | Method and system for increasing spectrum utilization factor in wavelength division multiplexing system |
| US20060045524A1 (en) * | 2004-08-28 | 2006-03-02 | Samsung Electronics Co.; Ltd | Optical access network of wavelength division method and passive optical network using the same |
| JP4810366B2 (en) * | 2006-09-07 | 2011-11-09 | 独立行政法人情報通信研究機構 | Wavelength conversion type wavelength division multiplexing transmission equipment |
| CN101431373A (en) * | 2008-12-15 | 2009-05-13 | 华为技术有限公司 | Signal processing method, junction centre, base station and network system |
-
2008
- 2008-12-15 CN CNA2008102397049A patent/CN101431373A/en active Pending
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010069235A1 (en) * | 2008-12-15 | 2010-06-24 | 华为技术有限公司 | Method for signal processing, central station, base station and network system |
| CN102427440A (en) * | 2011-08-25 | 2012-04-25 | 清华大学 | Photon-assisted multi-channel compression sampling (CS) system and method |
| CN102427440B (en) * | 2011-08-25 | 2014-06-04 | 清华大学 | Photon-assisted multi-channel compression sampling (CS) system and method |
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