CN103475416A - Central station, and method and system for downlink signal processing based on millimeter wave communication - Google Patents
Central station, and method and system for downlink signal processing based on millimeter wave communication Download PDFInfo
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- CN103475416A CN103475416A CN2012101853407A CN201210185340A CN103475416A CN 103475416 A CN103475416 A CN 103475416A CN 2012101853407 A CN2012101853407 A CN 2012101853407A CN 201210185340 A CN201210185340 A CN 201210185340A CN 103475416 A CN103475416 A CN 103475416A
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Abstract
The invention provides a central station, and a method and a system for downlink signal processing based on millimeter wave communication. A first optical carrier signal and a second optical carrier signal are generated by an optical carrier wave generator, wherein the frequency difference of the first optical carrier signal and the second optical carrier signal is equal to a preset millimeter wave signal frequency; then, an optical modulator modulates a baseband signal to the first optical carrier signal to generate a modulated optical carrier signal and sends the modulated optical carrier signal to an optical combiner; next, the optical combiner combines the second optical carrier signal and the modulated optical carrier signal and sends a combined signal to an optical fiber, and the combined signal is transmitted to a base station; and finally, the base station carries out difference frequency processing on the modulated optical carrier signal and the second optical carrier signal to generate a millimeter wave signal carrying a baseband signal and sends the millimeter wave signal to a user terminal. By the adoption of the central station, and the method and the system for downlink signal processing based on millimeter wave communication in the invention, millimeter wave communication between the central station and the user terminal is realized through optical fiber transmission carried out by loading a baseband signal on only one optical carrier wave, the dispersion effect of the optical fiber is reduced, and the quality of signal transmission in the optical fiber is improved.
Description
Technical field
The embodiment of the present invention relates to communication technical field, relates in particular to a kind of central station, down link signal processing method and system based on millimetre-wave attenuator.
Background technology
In recent years, popularization and development along with broadband multimedia services such as high speed internet and HDTV (High-Definition Television), following radio communication provides larger communication bandwidth by needs, yet, in current wireless communication system, frequency range below microwave is all occupied, therefore, can realize the high band wide data transmission of wireless short-distance, and support the millimeter wave frequency band of very little honeycomb to receive much attention, because the millimeter wave frequency band atmospheric attenuation is large, transmission range is limited, thereby millimeter wave light-carried wireless (Radio over Fiber, the ROF) communication technology is arisen at the historic moment.
In current ROF system, in order to simplify the handling process of base station, central station often adopts the optical carrier suppression modulator approach directly to be modulated on light carrier by baseband signal, thereby generate the modulation signal that all carries baseband signal on suppressed and two sidebands of carrier wave, and utilizing optical fiber that this signal is transferred to base station, base station is carried out to the received signal difference frequency and process to be produced the millimeter-wave signal and the user terminal that carry baseband signal and carry out millimetre-wave attenuator.
But current optical carrier suppression modulator approach is that two sidebands are loaded to baseband signal simultaneously, the effect of dispersion of optical fiber can cause serious intersymbol interference, thereby affects the transmission quality of signal in optical fiber.
Summary of the invention
For the above-mentioned defect of prior art, the embodiment of the present invention provides a kind of central station, down link signal processing method and system based on millimetre-wave attenuator.
One aspect of the present invention provides a kind of central station, comprising:
Light carrier generator, optical modulator and optical combiner, described optical modulator is connected with described optical combiner, and described light carrier generator is connected with described optical combiner with described optical modulator respectively;
Described light carrier generator, carry signal and send to described optical modulator for generating the first light, and generate the second light and carry signal and send to described optical combiner, wherein, it is default millimeter-wave frequency that described the first light carries the difference on the frequency that signal and described the second light carries signal;
Described optical modulator, carry on signal to generate and carry with described the first light that the signal frequency equates and the modulated light of carrying described baseband signal is carried extremely described optical combiner of signal transmission for baseband signal being modulated to described the first light;
Described optical combiner, carry signal and closed road and process and be sent to Optical Fiber Transmission to base station for described the second light being carried to signal and described modulated light, carry signal and carry out the difference frequency processing so that signal and described the second light are carried to described modulated light in described base station, generated frequency is described default millimeter-wave frequency and carries the millimeter-wave signal of described baseband signal and send to user terminal.
The present invention provides a kind of down link signal processing method based on millimetre-wave attenuator that above-mentioned central station carries out of applying on the other hand, comprising:
Described light carrier generator generates the first light and carries signal and send to described optical modulator, and generate the second light and carry signal and send to described optical combiner, wherein, to carry the difference on the frequency that signal and described the second light carries signal be default millimeter-wave frequency to described the first light;
Described optical modulator is modulated to described the first light by baseband signal and carries on signal to generate and carry with described the first light that the signal frequency equates and the modulated light of carrying described baseband signal is carried extremely described optical combiner of signal transmission;
Described optical combiner carries signal and described modulated light to described the second light and carries signal and closed road and process and be sent to Optical Fiber Transmission to base station, carry signal and carry out the difference frequency processing so that signal and described the second light are carried to described modulated light in described base station, generated frequency is described default millimeter-wave frequency and carries the millimeter-wave signal of described baseband signal and send to user terminal.
Another aspect of the invention provides a kind of down link signal treatment system based on millimetre-wave attenuator, comprising: base station and user terminal also comprise above-mentioned central station.
The central station that the embodiment of the present invention provides, down link signal processing method and system based on millimetre-wave attenuator, carry signal and the second light carries signal by poor the first light for default millimeter-wave signal frequency of light carrier generator generated frequency, and the first light is carried to signal be sent to optical modulator, and the second light is carried to signal be sent to optical combiner, then optical modulator is modulated to the first light by baseband signal and carries on signal and to generate modulated light and carry signal and send to optical combiner, then optical combiner carries signal and modulated light to the second light and carries signal and closed road and process and be sent to Optical Fiber Transmission to base station, base station is carried signal and the second light to modulated light and is carried signal and carry out the difference frequency processing, generation is carried the millimeter-wave signal of baseband signal and is sent to user terminal, thereby realized only loading the millimetre-wave attenuator that baseband signal is carried out Optical Fiber Transmission realization and user terminal on a light carrier, reduced the effect of dispersion of optical fiber, improved the transmission quality of signal in optical fiber.
The accompanying drawing explanation
The structural representation that Fig. 1 is an embodiment of central station of the present invention;
The flow chart that Fig. 2 is the down link signal processing method embodiment mono-based on millimetre-wave attenuator that carries out of the central station shown in application drawing 1;
The structural representation that Fig. 3 is another embodiment of central station of the present invention;
The flow chart that Fig. 4 is the down link signal processing method embodiment bis-based on millimetre-wave attenuator that carries out of the central station shown in application drawing 3;
The structural representation that Fig. 5 is the another embodiment of central station of the present invention;
The flow chart that Fig. 6 is the down link signal processing method embodiment tri-based on millimetre-wave attenuator that carries out of the central station shown in application drawing 5;
Fig. 7 is the structural representation that the present invention is based on an embodiment of down link signal treatment system of millimetre-wave attenuator;
The structural representation of the down link signal treatment system that Fig. 8 is the millimetre-wave attenuator of carrying out of the central station shown in application drawing 5.
Embodiment
The structural representation that Fig. 1 is an embodiment of central station of the present invention, as shown in Figure 1, this central station comprises:
Particularly, the flow chart that Fig. 2 is the down link signal processing method embodiment mono-based on millimetre-wave attenuator that carries out of the central station shown in application drawing 1, as shown in Figure 2, the method specifically comprises:
The light carrier generator that is positioned at central station generates that the first light carries signal and the second light carries signal, wherein, it is default millimeter-wave frequency that the first light carries the difference on the frequency that signal and the second light carries signal, illustrate, if it is 60GHz that base station and user terminal carry out the needed millimeter-wave frequency of millimetre-wave attenuator, it is 60GHz that the first light that the light carrier generator generates carries the difference on the frequency that signal and the second light carries signal.The first light that the light carrier generator will generate carries signal and is sent to optical modulator, and second light that will generate carries signal and is sent to optical combiner.
After optical modulator receives the first light that the light carrier generator sends and carries signal, baseband signal waiting for transmission is modulated to the first light and carries on signal and generate the modulated light of carrying baseband signal and carry signal.It should be noted that, optical modulator can be modulated to the first light by baseband signal waiting for transmission according to the applied concrete modulation system of central station and carry on signal, the frequency that modulated light is carried signal equates with the frequency that the first light carries signal, concrete modulation system comprises amplitude modulation mode, mode of frequency regulation and pm mode, and various modulation systems all belong to prior art and repeat no more herein.The modulated light that optical modulator will carry baseband signal is carried signal and is sent to optical combiner.
Optical combiner carries after the modulated light of carrying baseband signal that signal and optical modulator send carries signal receiving the second light that the light carrier generator sends, the second light is carried to signal and modulated light to be carried signal and is closed road and process and be sent to optical fiber, utilizing optical fiber will include the second light carries signal and modulated light and carries the mixed signal of signal and be transferred to base station, the modulated light that base station utilizes photo-detector or photoelectrical coupler to send optical combiner is carried signal and the second light and is carried signal and carry out the difference frequency processing, the frequency of carrying signal due to modulated light is consistent with the frequency that the first light carries signal, therefore, it is default millimeter-wave frequency that modulated light is carried the difference on the frequency that signal and the second light carries signal, thereby photo-detector or photoelectrical coupler can be default millimeter-wave frequency and carry the millimeter-wave signal of baseband signal by generated frequency after difference frequency processing and filtering processing, after through electric amplifier, this millimeter-wave signal being amplified to processing again, by antenna, send to user terminal and user's side to carry out millimetre-wave attenuator again.According to the example in step 100, describe, if it is 60GHz that base station and user terminal carry out the needed millimeter-wave frequency of millimetre-wave attenuator, it is 60GHz that the second light that optical combiner sends carries the difference on the frequency that signal and modulated light carry signal, thereby photo-detector is processed through the difference frequency that the second light is carried to signal and modulated light and carry signal and filtering can generated frequency be that 60GHz and the millimeter-wave signal that carries baseband signal and user's side are carried out millimetre-wave attenuator after processing.
The central station that the present embodiment provides and apply the down link signal processing method based on millimetre-wave attenuator that this central station carries out, carry signal and the second light carries signal by poor the first light for default millimeter-wave signal frequency of light carrier generator generated frequency, and the first light is carried to signal be sent to optical modulator, and the second light is carried to signal be sent to optical combiner, then optical modulator is modulated to the first light by baseband signal and carries on signal and to generate modulated light and carry signal and send to optical combiner, then optical combiner carries signal and modulated light to the second light and carries signal and closed road and process and be sent to Optical Fiber Transmission to base station, base station is carried signal and the second light to modulated light and is carried signal and carry out the difference frequency processing, generation is carried the millimeter-wave signal of baseband signal and is sent to user terminal, thereby realized only loading the millimetre-wave attenuator that baseband signal is carried out Optical Fiber Transmission realization and user terminal on a light carrier, reduced the effect of dispersion of optical fiber, improved the transmission quality of signal in optical fiber.
The structural representation that Fig. 3 is another embodiment of central station of the present invention, as shown in Figure 3, based on embodiment illustrated in fig. 1, light carrier generator 11 comprises: the first laser 111, both arms Mach zehnder modulators 112, phase bias device 113, local oscillation signal source 114, direct current biasing power supply 115 and optical branching device 116, wherein, both arms Mach zehnder modulators 112 respectively with the first laser 111, direct current biasing power supply 115 and optical branching device 116 are connected, an arm of both arms Mach zehnder modulators 112 is connected with local oscillation signal source 114, another arm is connected with local oscillation signal source 114 by phase bias device 113, optical branching device 116 is connected with optical combiner 13 with optical modulator 12 respectively, wherein, the first laser 111 carries signal and sends to both arms Mach zehnder modulators 112 for generating the 3rd light, the first driving signal that both arms Mach zehnder modulators 112 sends for receive local oscillation signal source 114 by a knee-joint, first to drive the frequency of signal be half of default millimeter-wave frequency, and receive through 113 pairs first of phase bias devices and drive signal to carry out the second driving signal sent after 180 degree phase shifts processing by another knee-joint, and the half-wave voltage that receives 115 transmissions of direct current biasing power supply, thereby generating the 3rd light carries the repressed double-sideband signal of signal and is sent to optical branching device 116, wherein, the difference on the frequency of two sidebands of double-sideband signal is default millimeter-wave frequency, optical branching device 116 process to generate for double-sideband signal being carried out to shunt that the first light carries signal and the second light carries signal, and the first light is carried to signal is sent to optical modulator 12, and the second light is carried to signal is sent to optical combiner 13.
Particularly, the flow chart that Fig. 4 is the down link signal processing method embodiment bis-based on millimetre-wave attenuator that carries out of the central station shown in application drawing 3, as shown in Figure 4, the method specifically comprises:
Step 200, the first laser generates the 3rd light and carries signal and send to both arms Mach zehnder modulators;
The first laser generates the 3rd light and carries signal and send to both arms Mach zehnder modulators, it should be noted that, the 3rd light that the first laser can select suitable laser generated frequency to belong to radio frequency or intermediate frequency according to the needs of the practical applications such as cost carries signal.
Both arms Mach zehnder modulators is after the 3rd light that receives the first laser transmission carries signal, receive by a knee-joint the first driving signal that the local oscillation signal source sends, first to drive the frequency of signal be half of default millimeter-wave frequency, and receive and through the phase bias device, the first driving signal is carried out the second driving signal sent after 180 degree phase shifts processing by another knee-joint, illustrate, if it is 40GHz that base station and user terminal carry out the needed millimeter-wave frequency of millimetre-wave attenuator, the frequency of the first driving signal that the local oscillation signal source sends is 20GHz, and both arms Mach zehnder modulators also receives the half-wave voltage that the direct current biasing power supply sends, thereby generate the 3rd light and carry the repressed double-sideband signal of signal, do not carry baseband signal on suppressed and two sidebands of the mean carrier of this double-sideband signal, in double-sideband signal, the frequency of upper sideband is the poor of frequency that the 3rd light the carries signal frequency that deducts the first driving signal, the frequency of lower sideband be frequency that the 3rd light the carries signal frequency that adds the first driving signal and, thereby the difference on the frequency of two sidebands is default millimeter-wave frequency, if according to above-mentioned example base station and user terminal, carrying out the needed millimeter-wave frequency of millimetre-wave attenuator is 40GHz, the difference on the frequency of two sidebands of double-sideband signal is 40GHz.Both arms Mach zehnder modulators will generate the double-sideband signal of not carrying baseband signal through the both arms modulation treatment and send to optical branching device.
Optical branching device is after the double-sideband signal of not carrying baseband signal that receives the transmission of both arms Mach zehnder modulators, double-sideband signal is carried out to shunt process to be generated the first light and carries signal and the second light and carry signal and be about to upper sideband and separate with lower sideband, if it is that to carry signal be lower sideband signal for upper side band signal and the second light that the first light carries signal, to carry the frequency of signal be the poor of frequency that the 3rd light the carries signal frequency that deducts the first driving signal to the first light, the frequency that the second light carries signal be frequency that the 3rd light the carries signal frequency that adds the first driving signal and, it is default millimeter-wave frequency that thereby the first light carries the difference on the frequency that signal and the second light carries signal, optical branching device carries signal by the first light and is sent to optical modulator, and the second light is carried to signal be sent to optical combiner.
The central station that the present embodiment provides and apply the down link signal processing method based on millimetre-wave attenuator that this central station carries out, the 3rd light that utilizes both arms Mach zehnder modulators to generate the first laser by the light carrier generator carries signal modulates the generation double-sideband signal, and by optical branching device, double-sideband signal is continued along separate routes that poor the first light for default millimeter-wave signal frequency of generated frequency carries signal and the second light carries signal, and the first light is carried to signal be sent to optical modulator, and the second light is carried to signal be sent to optical combiner, then optical modulator is modulated to the first light by baseband signal and carries on signal and to generate modulated light and carry signal and send to optical combiner, then optical combiner carries signal and modulated light to the second light and carries signal and closed road and process and be sent to Optical Fiber Transmission to base station, base station is carried signal and the second light to modulated light and is carried signal and carry out the difference frequency processing, generation is carried the millimeter-wave signal of baseband signal and is sent to user terminal, thereby just can realize only loading by the improvement to existing optical carrier suppression modulation technique the millimetre-wave attenuator that baseband signal is carried out Optical Fiber Transmission realization and user terminal on a light carrier, reduced the effect of dispersion of optical fiber, improved the transmission quality of signal in optical fiber.
The structural representation that Fig. 5 is the another embodiment of central station of the present invention, as shown in Figure 5, based on embodiment illustrated in fig. 1, described central station also comprises: pseudo-random binary sequence generator 14, pseudo-random binary sequence generator 14 is connected with optical modulator 12, for generating baseband signal and sending to optical modulator 12; Light carrier generator 11 comprises: second laser 117, the 3rd laser 118 and controller 119, second laser 117 is connected with optical modulator 12, the 3rd laser 118 is connected with optical combiner 13, and controller 119 is connected with the 3rd laser 118 with second laser 117 respectively.Wherein, second laser 117 carries signal and sends to optical modulator 12 for generating the first light; The 3rd laser 118 carries signal and sends to optical combiner 13 for generating the second light; Controller 119 is regulated the first light for the variation of the millimeter-wave frequency according to default and is carried the frequency that signal and the second light carry signal.
Particularly, the flow chart that Fig. 6 is the down link signal processing method embodiment tri-based on millimetre-wave attenuator that carries out of the central station shown in application drawing 5, as shown in Figure 6, the method specifically comprises:
Step 300, controller regulates according to the variation of default millimeter-wave frequency the frequency that the first light that second laser generates carries signal, and the 3rd the second light of generating of laser frequency of carrying signal, so that the first light carries the difference on the frequency that signal and the second light carries signal, be default millimeter-wave signal frequency;
Base station and user's side are carried out the millimeter-wave frequency that millimetre-wave attenuator used and need to be changed to some extent according to concrete application, after controller obtains the millimeter-wave frequency needed, the light that adjusting second laser and/or the 3rd laser are launched carries the wavelength of signal, making the first light carry the difference on the frequency that signal and the second light carries signal is default millimeter-wave signal frequency, thereby central station need not be as the structure of middle description embodiment illustrated in fig. 3, if base station and user's side are carried out millimeter-wave frequency that millimetre-wave attenuator used while changing, need to change the local oscillation signal source, complex operation, the wavelength that only carries signal by regulating light that second laser and/or the 3rd laser launch just can be realized.
Step 301, second laser generates described the first light and carries signal and send to described optical modulator;
The wavelength that second laser is regulated according to controller generates the first light and carries signal and the first light is carried to signal and be sent to optical modulator.
Step 302, the 3rd laser generates described the second light and carries signal and send to described optical combiner;
The wavelength that the 3rd laser is regulated according to controller generates the second light and carries signal and the second light is carried to signal and be sent to optical combiner.
Step 303, optical modulator receives the baseband signal that the pseudo-random binary sequence generator sends, and baseband signal is modulated to described the first light carries on signal to generate and carry with the first light that the signal frequency equates and the modulated light of carrying baseband signal is carried signal and sends to optical combiner;
Step 304, optical combiner carries signal and modulated light to the second light and carries signal and closed road and process and be sent to Optical Fiber Transmission to base station, carry signal and carry out the difference frequency processing so that signal and the second light are carried to modulated light in base station, generated frequency is default millimeter-wave frequency and carries the millimeter-wave signal of baseband signal and send to user terminal.
The central station that the present embodiment provides and apply the down link signal processing method based on millimetre-wave attenuator that this central station carries out, generating the first light by second laser carries signal and sends to optical modulator, and the 3rd laser generate the second light and carry signal and send to optical combiner, then optical modulator is modulated to the first light by baseband signal and carries on signal and to generate modulated light and carry signal and send to optical combiner, then optical combiner carries signal and modulated light to the second light and carries signal and closed road and process and be sent to Optical Fiber Transmission to base station, base station is carried signal and the second light to modulated light and is carried signal and carry out the difference frequency processing, generation is carried the millimeter-wave signal of baseband signal and is sent to user terminal, thereby realized only loading the millimetre-wave attenuator that baseband signal is carried out Optical Fiber Transmission realization and user terminal on a light carrier, reduced the effect of dispersion of optical fiber, improved the transmission quality of signal in optical fiber, and the optical millimeter wave of having simplified central station produces equipment, reduced cost, improved integrated level.
Fig. 7 is the structural representation that the present invention is based on an embodiment of down link signal treatment system of millimetre-wave attenuator, as shown in Figure 7, this system comprises: base station 1 and user terminal 2, also comprise: central station 3, wherein, central station 3 is connected with base station 1 by optical fiber, and millimetre-wave attenuator is carried out with user terminal 2 in base station 1, the central station that central station 3 can adopt the embodiment of the present invention to provide, base station 1 and base station and the user terminal of user terminal 2 for relating in the invention described above embodiment.
The down link signal treatment system based on millimetre-wave attenuator that the present embodiment provides, carry signal and the second light carries signal by poor the first light for default millimeter-wave signal frequency of light carrier generator generated frequency, and the first light is carried to signal be sent to optical modulator, and the second light is carried to signal be sent to optical combiner, then optical modulator is modulated to the first light by baseband signal and carries on signal and to generate modulated light and carry signal and send to optical combiner, then optical combiner carries signal and modulated light to the second light and carries signal and closed road and process and be sent to Optical Fiber Transmission to base station, base station is carried signal and the second light to modulated light and is carried signal and carry out the difference frequency processing, generation is carried the millimeter-wave signal of baseband signal and is sent to user terminal, thereby realized only loading the millimetre-wave attenuator that baseband signal is carried out Optical Fiber Transmission realization and user terminal on a light carrier, reduced the effect of dispersion of optical fiber, improved the transmission quality of signal in optical fiber.
The down link signal processing method that the down link signal treatment system based on millimetre-wave attenuator provided for the clearer explanation application embodiment of the present invention is carried out, the structural representation of the down link signal treatment system that Fig. 8 is the millimetre-wave attenuator of carrying out of the central station shown in application drawing 5, as shown in Figure 8, concrete signal processing is: it is that the first light that 1557.8nm and live width are less than 100KHz carries signal that second laser CW1 produces wavelength, and the first light is carried to signal send to optical modulator MZM, it is that the second light that 1557.3nm and live width are less than 100KHz carries signal that the 3rd laser CW2 produces wavelength, and the second light is carried to signal send to optical combiner OC, it is default millimeter-wave signal frequency 62GHz that thereby the first light carries the difference on the frequency that signal and the second light carries signal.It should be noted that between second laser and the 3rd laser not phase locking system, the frequency drift of these two lasers, within 100MHz, and has identical polarization direction.Then optical modulator is 2 by length
15-1 and the speed binary pseudo-random sequence (being equivalent to the baseband signal in the present embodiment) that is 5Gbit/s be modulated to the first light and carry that to generate wavelength on signal be that 1557.3nm and the modulated light of carrying binary pseudo-random sequence are carried signal, optical combiner carries signal and modulated light by the second light and carries signal and closed after process on road and send to monomode fiber to be transmitted, as shown in (i) in Fig. 8, because the right sideband is that to carry at the first light the pseudo random sequence data that signal raises 5Gbit/s processed be that modulated light is carried signal, so it is wider than left side sideband, be transferred to the photoelectrical coupler PIN of base station through the monomode fiber of 80km, photoelectrical coupler PIN carries signal and modulated light to the second light and carries signal and carry out after difference frequency processing and filtering are processed being 62GHz and carrying the millimeter-wave signal of baseband signal by generated frequency, and through electric amplifier EA, this millimeter-wave signal is amplified to processing, then carry out millimetre-wave attenuator by antenna and user terminal, the millimeter-wave signal that carries baseband signal that user terminal receives the base station transmission carries out obtaining baseband signal after demodulation process.The oscilloscope that is 16.5GHz by a bandwidth catches and records the millimeter-wave signal through PIN with the speed of 40GSample/s.Utilize MATLAB to draw signal eye diagram, as shown in (ii) in Fig. 8, can find out that the eye pattern effect is better, show that the transmission quality of signal in optical fiber is higher, overcome in the prior art and directly loaded the serious problem of dispersion that data-signal brings on double-side band simultaneously, reduced intersymbol interference.
One of ordinary skill in the art will appreciate that: realize that the hardware that all or part of step of said method embodiment can be relevant by program command completes, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
Finally it should be noted that: above embodiment only, in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: its technical scheme that still can put down in writing aforementioned each embodiment is modified, or part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a central station, is characterized in that, comprising:
Light carrier generator, optical modulator and optical combiner, described optical modulator is connected with described optical combiner, and described light carrier generator is connected with described optical combiner with described optical modulator respectively;
Described light carrier generator, carry signal and send to described optical modulator for generating the first light, and generate the second light and carry signal and send to described optical combiner, wherein, it is default millimeter-wave frequency that described the first light carries the difference on the frequency that signal and described the second light carries signal;
Described optical modulator, carry on signal to generate and carry with described the first light that the signal frequency equates and the modulated light of carrying described baseband signal is carried extremely described optical combiner of signal transmission for baseband signal being modulated to described the first light;
Described optical combiner, carry signal and closed road and process and be sent to Optical Fiber Transmission to base station for described the second light being carried to signal and described modulated light, carry signal and carry out the difference frequency processing so that signal and described the second light are carried to described modulated light in described base station, generated frequency is described default millimeter-wave frequency and carries the millimeter-wave signal of described baseband signal and send to user terminal.
2. central station according to claim 1, is characterized in that, described light carrier generator comprises:
The first laser, both arms Mach zehnder modulators, phase bias device, local oscillation signal source, direct current biasing power supply and optical branching device, wherein, described both arms Mach zehnder modulators is connected with described the first laser, described direct current biasing power supply and described optical branching device respectively, an arm of described both arms Mach zehnder modulators is connected with described local oscillation signal source, another arm is connected with described local oscillation signal source by described phase bias device, and described optical branching device is connected with described optical combiner with described optical modulator respectively;
Described the first laser, carry signal and send to described both arms Mach zehnder modulators for generating the 3rd light;
Described both arms Mach zehnder modulators, the the first driving signal sent for receive described local oscillation signal source by a knee-joint, described first to drive the frequency of signal be half of described default millimeter-wave frequency, and receive through described phase bias device the described first the second driving signal that drives signal to carry out after 180 degree phase shifts are processed sending by another knee-joint, and the half-wave voltage that receives described direct current biasing power supply transmission, thereby generating described the 3rd light carries the repressed double-sideband signal of signal and is sent to described optical branching device, wherein, the difference on the frequency of two sidebands of described double-sideband signal is described default millimeter-wave frequency,
Described optical branching device, for described double-sideband signal is carried out, described the first light of shunt processing generation carries signal and described the second light carries signal, and described the first light is carried to signal be sent to described optical modulator, and described the second light is carried to signal be sent to described optical combiner.
3. central station according to claim 1, is characterized in that, described light carrier generator comprises:
Second laser and the 3rd laser, described second laser is connected with described optical modulator, and described the 3rd laser is connected with described optical combiner;
Described second laser, carry signal and send to described optical modulator for generating described the first light;
Described the 3rd laser, carry signal and send to described optical combiner for generating described the second light.
4. central station according to claim 3, is characterized in that, described light carrier generator also comprises: controller,
Described controller is connected with described the 3rd laser with described second laser respectively, regulates described the first light for the variation of the millimeter-wave frequency according to default and carries the frequency that signal and described the second light carry signal.
5. according to the described central station of claim 1-4 any one, it is characterized in that, described central station also comprises:
The pseudo-random binary sequence generator, described pseudo-random binary sequence generator is connected with described optical modulator, for generating described baseband signal and sending to described optical modulator.
6. apply the down link signal processing method based on millimetre-wave attenuator that central station as claimed in claim 1 carries out, it is characterized in that, described method comprises:
Described light carrier generator generates the first light and carries signal and send to described optical modulator, and generate the second light and carry signal and send to described optical combiner, wherein, to carry the difference on the frequency that signal and described the second light carries signal be default millimeter-wave frequency to described the first light;
Described optical modulator is modulated to described the first light by baseband signal and carries on signal to generate and carry with described the first light that the signal frequency equates and the modulated light of carrying described baseband signal is carried extremely described optical combiner of signal transmission;
Described optical combiner carries signal and described modulated light to described the second light and carries signal and closed road and process and be sent to Optical Fiber Transmission to base station, carry signal and carry out the difference frequency processing so that signal and described the second light are carried to described modulated light in described base station, generated frequency is described default millimeter-wave frequency and carries the millimeter-wave signal of described baseband signal and send to user terminal.
7. the down link signal processing method based on millimetre-wave attenuator according to claim 6, it is characterized in that, described light carrier generator comprises: the first laser, both arms Mach zehnder modulators, phase bias device, local oscillation signal source, direct current biasing power supply and optical branching device;
Described light carrier generator generates the first light and carries signal and send to described optical modulator, and generates the second light and carry signal and send to described optical combiner and comprise:
Described the first laser generates the 3rd light and carries signal and send to described both arms Mach zehnder modulators;
Described both arms Mach zehnder modulators receives by a knee-joint the first driving signal that described local oscillation signal source sends, described first to drive the frequency of signal be half of described default millimeter-wave frequency, and receive through described phase bias device the described first the second driving signal that drives signal to carry out after 180 degree phase shifts are processed sending by another knee-joint, and the half-wave voltage that receives described direct current biasing power supply transmission, thereby generating described the 3rd light carries the repressed double-sideband signal of signal and is sent to described optical branching device, wherein, the difference on the frequency of two sidebands of described double-sideband signal is described default millimeter-wave frequency,
Described optical branching device carries out shunt to described double-sideband signal and process to generate that described the first light carries signal and described the second light carries signal, and described the first light is carried to signal be sent to described optical modulator, and described the second light is carried to signal be sent to described optical combiner.
8. the down link signal processing method based on millimetre-wave attenuator according to claim 6, is characterized in that, described light carrier generator comprises: second laser and the 3rd laser,
Described light carrier generator generates the first light and carries signal and send to described optical modulator, and generates the second light and carry signal and send to described optical combiner and comprise:
Described second laser generates described the first light and carries signal and send to described optical modulator;
Described the 3rd laser generates described the second light and carries signal and send to described optical combiner.
9. the down link signal processing method based on millimetre-wave attenuator according to claim 8, is characterized in that, described light carrier generator also comprises: controller, and described method also comprises:
Described controller is regulated described the first light according to the variation of default millimeter-wave frequency and is carried the frequency that signal and described the second light carry signal.
10. the down link signal treatment system based on millimetre-wave attenuator comprises: base station and user terminal, it is characterized in that, and also comprise: as the described central station of claim 1-5 any one.
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