CN102457458A - Method and device for realizing digital predistortion of base station - Google Patents
Method and device for realizing digital predistortion of base station Download PDFInfo
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Abstract
The invention discloses a method and a device for realizing digital predistortion of a base station.A digital signal processing unit and a near-end radio frequency processing unit are arranged at the side of the base station, and the digital signal processing unit can receive a baseband signal from the baseband processing unit which is also positioned at the side of the base station through a cable without using a digital optical module, so that the limitation of the rate of the digital optical module on the radio frequency bandwidth is eliminated, and the expandability of carrier waves and frequency bands transmitted by the base station is improved; the near-end radio frequency processing unit and the far-end radio frequency processing unit transmit optical signals obtained by radio frequency signal conversion through optical fibers, digital predistortion of a base station is realized through an optical carrier wireless technology, and the efficiency of a power amplifier in the far-end radio frequency processing unit at the far end is improved; because the radio frequency signal corresponding to the optical signal in the optical fiber is an analog signal, and the radio frequency bandwidth of the optical transceiver in the near-end radio frequency processing unit and the far-end radio frequency processing unit can reach more than 1GHz, the combination requirement of different frequency bands is met.
Description
Technical field
The present invention relates to communication technical field, particularly relate to the implementation method and the device of a kind of base station digital pre-distortion.
Background technology
3G (3rd Generation, 3G (Third Generation) Moblie technology) network uses the distributed base station framework in a large number, and this base station architecture comprises BBU (Base Band Unit, baseband processing unit) and RRU (Radio RemoteUnit, Remote Radio Unit) two parts.Wherein, BBU is installed in suitable machine room position, and RRU is installed in antenna end, through BBU is separated with RRU, can maintenance work be simplified to BBU.A BBU can support a plurality of RRU, has both saved the space, reduces that again cost being set, and improves networking efficient, the indoor covering that can solve large stadium well.
Because the signal of high peak-to-average force ratio is easy to cause nonlinear distortion in amplification process, bring the decline of signal of communication quality, therefore, RRU adopts the method for back-off usually to power amplifier, to satisfy required high linear requirement.For example; For power output is the power amplifier of 20W; Often need use power as the FET of 200W and make it be operated in the very big category-A state of power consumption, bring easily high-power high-frequency rate RF power amplification high power consumption, poor efficiency (less than 10%), heating is big, reliability is low and a series of problem such as cost height.
For addressing the above problem; Can adopt DPD (Digital Pre-Distortion among the RRU; Digital pre-distortion) technology is directly introduced predistortion in the radio-frequency input signals of power amplifier; Make power amplifier linearity work, thereby improve the efficient of power amplifier, reach and reduce power consumption and the purpose that reduces cost.At the local DPD that accomplishes of RRU, its implementation structure is as shown in Figure 1 usually for prior art.FPGA (FieldProgrammable Gate Array, field programmable gate array) exports to DAC (Digital Analog Converter through the DPD module with this signal with inserting in the baseband signal; Digital to analog converter); Be converted to Simulation with I F (Intermediate Frequency, intermediate frequency) signal by DAC, this Simulation with I F signal is through I/Q (In-Phase/Quadrature; Quadrature in the same way) modulators modulate becomes radiofrequency signal; This radiofrequency signal is launched through antenna after PA (Power Amplifier, power amplifier) amplifies.In order to compensate the nonlinear distortion that PA causes radiofrequency signal; The fraction signal can be coupled out from the delivery outlet of PA; And be input to FB (Feed Back, feedback) link, after this signal process amplification and the following mixing; Become digital signal by ADC (AnalogDigital Converter, analog to digital converter) sampling and be input to FPGA.FPGA uses its internal logic to calculate the nonlinear model of PA, to this nonlinear model get contrary after, the result is fed back to self output signal, the counter nonlinear model of mending out PA in baseband signal, and finally realize predistortion.
In realizing process of the present invention, the inventor finds that there is following problem at least in prior art:
RRU based on existing DPD technology is installed on antenna end; Receive baseband signal through the digital light module from the base station; The transmission radio frequency bandwidth of RRU is by the speed decision of employed digital light module; For example, for the A+F frequency range RRU of totally 21 carrier waves be connected with the light mouth of base station, need to use the digital light module of 6G.If carrier wave and frequency range continue expansion, then need the digital light module of higher rate, thereby increased the realization difficulty and the cost of digital light module and Base-Band Processing.In addition, existing RRU carries out the plywood design with power amplifier and baseband processing unit and RF processing unit, and design difficulty is bigger, is not easy to safeguard; And RRU is to the bad adaptability of frequency band, and 1 RRU can only support two frequency ranges, if use plural frequency range, then need use a plurality of RRU.
Summary of the invention
Embodiments of the invention provide the implementation method and the device of a kind of base station digital pre-distortion, in order in the base station, to realize digital pre-distortion.
Embodiments of the invention propose the implement device of a kind of base station digital pre-distortion, comprising: proximal device processing unit and connected remote processor unit, and the digital signal processing unit that is connected with said near-end processing unit; Wherein
The near-end RF processing unit is used for converting the radiofrequency signal of base station to light signal through optical transceiver, and said light signal is sent to said far end radio frequency processing unit; To be reduced to feedback signal from the light signal of said far end radio frequency processing unit through optical transceiver, said feedback signal will be sent to said digital signal processing unit;
The far end radio frequency processing unit is used for through optical transceiver the light signal that receives being reduced to radiofrequency signal and emission; Obtain feedback signal from the output coupling of said remote equipment processing unit, convert said feedback signal into light signal through optical transceiver, and said light signal is sent to said near-end RF processing unit;
Digital signal processing unit is used for carrying out digital pre-distortion according to the feedback signal that receives and handles.
Embodiments of the invention also propose the implementation method of a kind of base station digital pre-distortion, comprising:
The near-end RF processing unit converts the radiofrequency signal of base station to light signal through optical transceiver, and said light signal is sent to the far end radio frequency processing unit;
Said far end radio frequency processing unit is reduced to radiofrequency signal and emission through optical transceiver with the light signal that receives;
Said far end radio frequency processing unit obtains feedback signal from the output coupling, converts said feedback signal into light signal through optical transceiver, and said light signal is sent to said near-end RF processing unit;
Said near-end RF processing unit will be reduced to feedback signal from the light signal of said far end radio frequency processing unit through optical transceiver; Said feedback signal is sent to digital signal processing unit, and said digital signal processing unit carries out digital pre-distortion according to the feedback signal that receives to be handled.
Embodiments of the invention comprise following advantage; Because the light signal that is converted to by radiofrequency signal through Optical Fiber Transmission between near-end RF processing unit and the far end radio frequency processing unit; Realize the base station digital pre-distortion through the light-carried wireless technology, improved the efficient of the power amplifier of the far end radio frequency processing unit that is arranged in far-end; Because the radiofrequency signal that the light signal that transmits in the optical fiber is corresponding is an analog signal; And the radio frequency bandwidth of the optical transceiver in near-end RF processing unit and the far end radio frequency processing unit can reach more than the 1GHz; Can support plural frequency range, that has satisfied different frequency range closes the road requirement.
Description of drawings
Fig. 1 is a DPD implementation structure sketch map of the prior art;
Fig. 2 is the structural representation of the implement device of the base station digital pre-distortion in the embodiment of the invention;
Fig. 3 is optical sender and the transmission of the signal between the optical receiver sketch map in the embodiment of the invention;
Fig. 4 is the implementation method flow chart of the base station digital pre-distortion in the embodiment of the invention.
Embodiment
In the embodiment of the invention, the near-end RF processing unit (or claiming near-end RRU) that is positioned at base station side converts radiofrequency signal to light signal through optical transceiver, and this light signal is sent to the far end radio frequency processing unit (or claiming far-end RRU) that separates with the base station; The far end radio frequency processing unit is reduced to radiofrequency signal through optical transceiver with the light signal that receives, and uses power amplifier that this radiofrequency signal is amplified, and the radiofrequency signal after the emission amplification; The far end radio frequency processing unit obtains feedback signal from the output coupling of power amplifier, converts said feedback signal into light signal through optical transceiver, and this light signal is sent to the near-end RF processing unit; The near-end RF processing unit is reduced to feedback signal through optical transceiver with the light signal that receives, and this feedback signal is sent to digital signal processing unit, and digital signal processing unit carries out digital pre-distortion according to this feedback signal to be handled.
To combine the accompanying drawing among the present invention below, the technical scheme among the present invention is carried out clear, complete description, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belongs to the scope that the present invention protects.
As shown in Figure 2; Structural representation for the implement device of the base station digital pre-distortion in the embodiment of the invention; Comprise that but the form with the plug backboard is arranged at the digital signal processing unit of base station side, DAC, I/Q modulator (the IQ MOD shown in the figure), ADC, frequency mixer (MIXER shown in the figure), near-end RF processing unit, and the far end radio frequency processing unit that separates with the base station and be connected with the near-end RF processing unit through optical fiber.Wherein, digital signal processing unit can be special chip or FPGA, is used to realize DUC (Digital Up Converter, Digital Up Convert), CFR (Crest Factor Reduction, crest factor reduces) and DPD; The near-end RF processing unit comprises gain module (gain block) and optical transceiver; The far end radio frequency processing unit comprises optical transceiver and PA.
At down direction, digital signal processing unit receives and handles the baseband signal from baseband processing unit (BBU), to DAC output signal; DAC is an intermediate-freuqncy signal with the output conversion of signals of digital signal processing unit, and this intermediate-freuqncy signal is sent to the I/Q modulator; The I/Q modulator is modulated into radiofrequency signal with the intermediate-freuqncy signal that receives, and this radiofrequency signal is sent to the near-end RF processing unit; The near-end RF processing unit amplifies the radiofrequency signal that receives through gain module, and the radiofrequency signal after will amplifying through the laser in the optical transceiver converts light signal to, and this light signal is passed through fiber optic stretch to far end radio frequency processing unit.The far end radio frequency processing unit is reduced to radiofrequency signal through the photodiode in the optical transceiver with the light signal that receives, and the use power amplifier amplifies radiofrequency signal and launches.
At up direction; The far end radio frequency processing unit obtains feedback signal from the output coupling of power amplifier; Convert this feedback signal into light signal through the laser in the optical transceiver, and this light signal is arrived the near-end RF processing unit of base station side through Optical Fiber Transmission; After the photodiode of near-end RF processing unit through lattice in the photoelectricity sender is reduced to radiofrequency signal with light signal, can amplify this radiofrequency signal through gain module, and the radiofrequency signal after will amplifying sends to frequency mixer; Frequency mixer is mixed down intermediate-freuqncy signal with the radiofrequency signal that receives, and this intermediate-freuqncy signal is sent to ADC; ADC converts the intermediate-freuqncy signal that receives into digital signal, and this digital signal is sent to digital signal processing unit; Digital signal processing unit carries out the DPD computing according to the digital signal that receives.
In addition; The upward signal that is sent to the base station by the far end radio frequency processing unit passes through LNA (Low NoiseAmplifier; Low noise amplifier) after the amplification; Also can convert light signal into through the laser in the optical transceiver, the far end radio frequency processing unit arrives this light signal the near-end RF processing unit of base station side through Optical Fiber Transmission; The near-end RF processing unit is reduced to upward signal through the photodiode of lattice in the photoelectricity sender with light signal, and carries out subsequent operation.
This shows, in the embodiment of the invention to the processing mode of upward signal with similar to the processing mode of feedback signal.Owing to similar, can make shared same the up link of upward signal and feedback signal to the processing mode of feedback signal to the processing mode of upward signal.Based on TDD (Time Division Duplex; Time division duplex) characteristics of system, uplink and downlink signals separates on time domain, therefore; Can be in the moment that upward signal is closed; Use the link transmission feedback signal of upward signal, and use the diverter switch in the far end radio frequency processing unit to carry out the signal switching, distinguish upward signal and feedback signal through time slot according to particular time-slot.At descending time slot, the ul transmissions feedback signal; At ascending time slot, the ul transmissions upward signal.
In the process of above-mentioned signal transmission; Upward signal, feedback signal and transmitted in same optical fiber to the downstream signal that the far end radio frequency processing unit sends by the near-end RF processing unit, signal receiving end can distinguish downstream signal and upward signal and the feedback signal in same optical fiber, transmitted through wavelength-division multiplex technique.For example, it is the laser of 1510nm that downstream signal can adopt wavelength, and it is the laser of 1310nm that feedback signal and upward signal can adopt wavelength.In optical fiber, wavelength optical signals can the phase mutual interference.At signal receiving end; Optical transceiver comprises optical sender and optical receiver; Both are connected to same optical fiber through wavelength division multiplexer (WDM); The function class of this wavelength division multiplexer is similar to filter, can unwanted light signal be masked, and the demodulation correctly of downstream signal, upward signal and feedback signal is come out.
As shown in Figure 3, be optical sender in the embodiment of the invention and the transmission of the signal between optical receiver sketch map, wherein, optical sender and optical receiver are arranged in different device or module.Optical sender comprises amplifier, optical module, also can comprise power detecting unit and temperature control unit, and the optical module in the optical sender comprises matching unit, laser and isolator; Optical receiver comprises optical module, amplifier, also can comprise watch-dog and alarm, and the optical module in the optical receiver comprises photodiode and matching unit.After optical sender receives radiofrequency signal, use amplifier and matching unit respectively radiofrequency signal to be amplified and improved feedback, and use laser to convert radiofrequency signal into light signal, this light signal arrives optical receiver through isolator and Optical Fiber Transmission.Optical receiver uses the photodiode in the optical module to convert the light signal that receives into radiofrequency signal, and use matching unit and amplifier transfer out after this radiofrequency signal is improved feedback and amplification.
Optical transceiver keeps 0dB in gain, can gain requirements not arranged to the TDD system.The deterioration of the ACPR to radiofrequency signal (Adjacent Channel PowerRatio, side channel power ratio) that produces owing to the noise of the laser in the optical sender can be proofreaied and correct through the DPD technology.Simultaneously, the time delay of optical transceiver and optical fiber link maintains the ns level, can not influence the TDD system to synchronous requirement.
Embodiments of the invention comprise following advantage; Because digital signal processing unit and near-end RF processing unit are arranged on base station side; Digital signal processing unit can receive the baseband signal from the baseband processing unit that is positioned at base station side equally through cable; Need not to use the digital light module, broken away from of the restriction of the speed of digital light module, improved the carrier wave of base station transmits and the extensibility of frequency range radio frequency bandwidth; The light signal that is converted to by radiofrequency signal through Optical Fiber Transmission between near-end RF processing unit and the far end radio frequency processing unit; Realize the base station digital pre-distortion through the light-carried wireless technology, improved the efficient of the power amplifier of the far end radio frequency processing unit that is arranged in far-end; Because the radiofrequency signal that the light signal that transmits in the optical fiber is corresponding is an analog signal; And the radio frequency bandwidth of the optical transceiver in near-end RF processing unit and the far end radio frequency processing unit can reach more than the 1GHz; Can support plural frequency range, that has satisfied different frequency range closes the road requirement.In addition,, reduced design difficulty, and be convenient to maintenance because power amplifier and digital signal processing unit and near-end RF processing unit are carried out separate design.Certainly, arbitrary product of the embodiment of embodiment of the present invention might not reach above-described all advantages simultaneously.
According to the implement device of the base station digital pre-distortion that provides in the above-mentioned execution mode, the embodiment of the invention also provides the method for the implement device of using above-mentioned base station digital pre-distortion.
As shown in Figure 4, the implementation method flow chart for the base station digital pre-distortion in the embodiment of the invention may further comprise the steps:
Particularly, because digital signal processing unit and baseband processing unit are positioned at base station side simultaneously, both can pass through the cable transmission baseband signal.
Wherein, The near-end RF processing unit comprises gain module and optical transceiver; Can amplify the radiofrequency signal that receives through gain module; Radiofrequency signal after will amplifying through optical transceiver converts light signal to, and uses optical fiber that the light signal that is converted to is sent to the far end radio frequency processing unit.
Particularly, after the near-end RF processing unit is reduced to radiofrequency signal with light signal, can amplify this radiofrequency signal through gain module, and the radiofrequency signal after will amplifying sends to frequency mixer.
In the embodiment of the invention; The far end radio frequency processing unit can also amplify upward signal through low noise amplifier; And the upward signal after through optical transceiver low noise amplifier being amplified converts light signal into, and this light signal is sent to the near-end RF processing unit; The near-end RF processing unit is reduced to upward signal through optical transceiver with the light signal that receives.Upward signal and feedback signal can shared same up links, and this up link is transmitted feedback signal at descending time slot, at ascending time slot transmission upward signal.
Optical transceiver in the embodiment of the invention comprises optical sender and optical receiver; Optical sender and optical receiver are connected to same optical fiber through wavelength division multiplexer; Upward signal, feedback signal and transmit in same optical fiber to the downstream signal that the far end radio frequency processing unit sends by the near-end RF processing unit; The signal receiving end at optical transceiver place distinguishes downstream signal and upward signal and feedback signal through wavelength division multiplexer, and passes through time slot differentiation upward signal and feedback signal.
Embodiments of the invention comprise following advantage; Because digital signal processing unit and near-end RF processing unit are arranged on base station side; Digital signal processing unit can receive the baseband signal from the baseband processing unit that is positioned at base station side equally through cable; Need not to use the digital light module, broken away from of the restriction of the speed of digital light module, improved the carrier wave of base station transmits and the extensibility of frequency range radio frequency bandwidth; The light signal that is converted to by radiofrequency signal through Optical Fiber Transmission between near-end RF processing unit and the far end radio frequency processing unit; Realize the base station digital pre-distortion through the light-carried wireless technology, improved the efficient of the power amplifier of the far end radio frequency processing unit that is arranged in far-end; Because the radiofrequency signal that the light signal that transmits in the optical fiber is corresponding is an analog signal; And the radio frequency bandwidth of the optical transceiver in near-end RF processing unit and the far end radio frequency processing unit can reach more than the 1GHz; Can support plural frequency range, that has satisfied different frequency range closes the road requirement.In addition,, reduced design difficulty, and be convenient to maintenance because power amplifier and digital signal processing unit and near-end RF processing unit are carried out separate design.Certainly, arbitrary product of the embodiment of embodiment of the present invention might not reach above-described all advantages simultaneously.
It will be appreciated by those skilled in the art that the module in the device among the embodiment can be distributed in the device of embodiment according to the embodiment description, also can carry out respective change and be arranged in the one or more devices that are different from present embodiment.The module of the foregoing description can be merged into a module, also can further split into a plurality of submodules.
Through the description of above execution mode, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform, can certainly pass through hardware, but the former is better execution mode under a lot of situation.Based on such understanding; The part that technical scheme of the present invention contributes to prior art in essence in other words can be come out with the embodied of software product; This computer software product is stored in the storage medium, comprise some instructions with so that a station terminal equipment (can be mobile phone, personal computer; Server, the perhaps network equipment etc.) carry out the described method of each embodiment of the present invention.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be looked protection scope of the present invention.
Claims (10)
1. the implement device of a base station digital pre-distortion is characterized in that, comprising: proximal device processing unit and connected remote processor unit, and the digital signal processing unit that is connected with said near-end processing unit; Wherein
The near-end RF processing unit is used for converting the radiofrequency signal of base station to light signal through optical transceiver, and said light signal is sent to said far end radio frequency processing unit; To be reduced to feedback signal from the light signal of said far end radio frequency processing unit through optical transceiver, said feedback signal will be sent to said digital signal processing unit;
The far end radio frequency processing unit is used for through optical transceiver the light signal that receives being reduced to radiofrequency signal and emission; Obtain feedback signal from the output coupling of said remote equipment processing unit, convert said feedback signal into light signal through optical transceiver, and said light signal is sent to said near-end RF processing unit;
Digital signal processing unit is used for carrying out digital pre-distortion according to the feedback signal that receives and handles.
2. device as claimed in claim 1 is characterized in that, said near-end RF processing unit is positioned at base station side, and this unit comprises: gain module and optical transceiver; Wherein
Said gain module is used to amplify the radiofrequency signal of base station and from the feedback signal of said optical transceiver, and the feedback signal after will amplifying sends to said digital signal processing unit;
Said optical transceiver is used for the radiofrequency signal of the base station after amplifying through said gain module is converted to light signal and sends to said far end radio frequency processing unit, and will be reduced to feedback signal from the light signal of said far end radio frequency processing unit;
Said far end radio frequency processing unit is positioned at antenna side, and this unit comprises: power amplifier and optical transceiver; Wherein
Said optical transceiver is used for the light signal that receives is reduced to radiofrequency signal, and feedback signal is converted into light signal and sends to said near-end RF processing unit;
Said power amplifier is used to amplify the radiofrequency signal from said optical transceiver.
3. device as claimed in claim 1 is characterized in that,
Said far end radio frequency processing unit; Also be used for amplifying upward signal through low noise amplifier; And the upward signal after through optical transceiver said low noise amplifier being amplified converts light signal into, and said light signal is sent to said near-end RF processing unit;
Said near-end RF processing unit also is used for through optical transceiver the light signal that receives being reduced to upward signal.
4. device as claimed in claim 3 is characterized in that, shared same the up link of said upward signal and said feedback signal, and said up link is transmitted said feedback signal at descending time slot, transmits said upward signal at ascending time slot.
5. device as claimed in claim 3 is characterized in that said optical transceiver comprises optical sender, optical receiver and wavelength division multiplexer, and said optical sender and optical receiver are connected to same optical fiber through said wavelength division multiplexer; Wherein
Said optical fiber is used to the downstream signal that transmits said upward signal, said feedback signal and sent to said far end radio frequency processing unit by said near-end RF processing unit;
Said wavelength division multiplexer is used for said downstream signal and said upward signal and said feedback signal are distinguished;
The signal receiving end at said optical transceiver place is used for distinguishing said upward signal and said feedback signal through time slot.
6. the implementation method of a base station digital pre-distortion of realizing with the implement device of each described base station digital pre-distortion of claim 1 to 5 is characterized in that, comprising:
The near-end RF processing unit converts the radiofrequency signal of base station to light signal through optical transceiver, and said light signal is sent to the far end radio frequency processing unit;
Said far end radio frequency processing unit is reduced to radiofrequency signal and emission through optical transceiver with the light signal that receives;
Said far end radio frequency processing unit obtains feedback signal from the output coupling, converts said feedback signal into light signal through optical transceiver, and said light signal is sent to said near-end RF processing unit;
Said near-end RF processing unit will be reduced to feedback signal from the light signal of said far end radio frequency processing unit through optical transceiver; Said feedback signal is sent to digital signal processing unit, and said digital signal processing unit carries out digital pre-distortion according to the feedback signal that receives to be handled.
7. method as claimed in claim 6 is characterized in that,
Said near-end RF processing unit converts the radiofrequency signal of base station to light signal through optical transceiver, and said light signal is sent to the far end radio frequency processing unit, comprising:
Gain module amplifies the radiofrequency signal of said base station;
The radiofrequency signal that optical transceiver will pass through the base station after said gain module amplifies converts light signal to and sends to said far end radio frequency processing unit;
Said near-end RF processing unit will be reduced to feedback signal from the light signal of said far end radio frequency processing unit through optical transceiver, and said feedback signal is sent to digital signal processing unit, comprise:
Optical transceiver will be reduced to feedback signal from the light signal of said far end radio frequency processing unit;
Gain module amplifies the feedback signal from said optical transceiver, and the feedback signal after will amplifying sends to said digital signal processing unit;
Said far end radio frequency processing unit converts said feedback signal into light signal through optical transceiver, and said light signal is sent to said near-end RF processing unit, comprising:
Optical transceiver is reduced to radiofrequency signal with the light signal that receives, and power amplifier amplifies the radiofrequency signal from said optical transceiver.
8. method as claimed in claim 6 is characterized in that, also comprises:
Said far end radio frequency processing unit amplifies upward signal through low noise amplifier, and the upward signal after through optical transceiver said low noise amplifier being amplified converts light signal into, and said light signal is sent to said near-end RF processing unit;
Said near-end RF processing unit is reduced to upward signal through optical transceiver with the light signal that receives.
9. method as claimed in claim 8 is characterized in that, shared same the up link of said upward signal and said feedback signal, and said up link is transmitted said feedback signal at descending time slot, transmits said upward signal at ascending time slot.
10. method as claimed in claim 8; It is characterized in that; Said optical transceiver comprises optical sender and optical receiver; Said optical sender and optical receiver are connected to same optical fiber through wavelength division multiplexer; Said upward signal, said feedback signal and transmitted in same optical fiber to the downstream signal that said far end radio frequency processing unit sends by said near-end RF processing unit, the signal receiving end at said optical transceiver place distinguishes said downstream signal and said upward signal and said feedback signal through said wavelength division multiplexer, and distinguishes said upward signal and said feedback signal through time slot.
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