CN102457458B - The implementation method of a kind of base station digital pre-distortion and device - Google Patents

The implementation method of a kind of base station digital pre-distortion and device Download PDF

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CN102457458B
CN102457458B CN201010514983.2A CN201010514983A CN102457458B CN 102457458 B CN102457458 B CN 102457458B CN 201010514983 A CN201010514983 A CN 201010514983A CN 102457458 B CN102457458 B CN 102457458B
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signal
processing unit
radio frequency
optical transceiver
base station
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CN102457458A (en
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鄢凯
段滔
倪慧娟
周游
伍坚
李昕
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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Abstract

The invention discloses implementation method and the device of a kind of base station digital pre-distortion, digital signal processing unit and near-end RF processing unit are arranged on base station side, digital signal processing unit can by cable reception from the baseband signal of baseband processing unit being positioned at base station side equally, without the need to using digital light module, break away from the restriction of the speed radio frequency bandwidth of digital light module, improve the carrier wave of base-station transmission and the extensibility of frequency range; By light signal that Optical Fiber Transmission is converted to by radiofrequency signal between near-end RF processing unit and far end radio frequency processing unit, realize base station digital pre-distortion by light-carried wireless technology, improve the efficiency of the power amplifier of the far end radio frequency processing unit being arranged in far-end; Because the radiofrequency signal that the light signal in optical fiber is corresponding is analog signal, and the radio frequency bandwidth of optical transceiver in near-end RF processing unit and far end radio frequency processing unit can reach more than 1GHz, meets the conjunction road requirement of different frequency range.

Description

The implementation method of a kind of base station digital pre-distortion and device
Technical field
The present invention relates to communication technical field, particularly relate to implementation method and the device of a kind of base station digital pre-distortion.
Background technology
3G (3rd Generation, G mobile communication) network uses distribution-type base station architecture in a large number, this base station architecture comprises BBU (Base Band Unit, baseband processing unit) and RRU (Radio RemoteUnit, Remote Radio Unit) two parts.Wherein, BBU is arranged on suitable Host equipment room, and RRU is arranged on antenna end, by being separated by BBU and RRU, maintenance work can be simplified to BBU.A BBU can support multiple RRU, both saves space, and reduces setup cost again, improves networking efficiency, can solve the in-door covering of large stadium well.
Signal due to high peak-to-average power ratio is easy to cause nonlinear distortion in amplification process, brings the decline of communication signal quality, and therefore, RRU adopts the method for back-off usually to power amplifier, to meet required High Linear requirement.Such as, be the power amplifier of 20W for power output, the field effect transistor that often needs to use power to be 200W also makes it be operated in the very large category-A state of power consumption, easily brings the high power consumption of high-power high-frequency rate radio-frequency (RF) power amplification, poor efficiency (less than 10%), heating is large, reliability is low and a series of problem of high in cost of production.
For solving the problem, DPD (Digital Pre-Distortion can be adopted in RRU, digital pre-distortion) technology directly introduces predistortion in the radio-frequency input signals of power amplifier, make power amplifier linearity work, thus improve the efficiency of power amplifier, reach the object reducing power consumption and reduce costs.Prior art completes DPD in RRU this locality usually, and its implementation structure as shown in Figure 1.FPGA (FieldProgrammable Gate Array, field programmable gate array) by baseband signal interpolation, by DPD module, this signal is exported to DAC (Digital Analog Converter, digital to analog converter), Simulation with I F (Intermediate Frequency is converted to by DAC, intermediate frequency) signal, this Simulation with I F signal is through I/Q (In-Phase/Quadrature, orthogonal in the same way) modulators modulate becomes radiofrequency signal, this radiofrequency signal is through PA (Power Amplifier, power amplifier) amplify after, gone out by antenna transmission.In order to compensate the nonlinear distortion that PA radio frequency signal causes, fraction signal can be coupled out from the delivery outlet of PA, and be input to FB (Feed Back, feedback) link, this signal is after amplification and lower 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 inverse after, result feedback is given the output signal of self, the anti-nonlinear model mending out PA in baseband signal, and finally realizes predistortion.
Realizing in process of the present invention, inventor finds prior art, and at least there are the following problems:
RRU based on existing DPD technology is installed on antenna end, the baseband signal from base station is received by digital light module, the transmission radio frequency bandwidth of RRU is determined by the speed of used digital light module, such as, for A+F frequency range the 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, thus increase digital light module and Base-Band Processing realize difficulty and cost.In addition, power amplifier and baseband processing unit and RF processing unit are carried out plywood design by existing RRU, and design difficulty is comparatively large, are not easy to safeguard; And RRU is to the bad adaptability of frequency band, 1 RRU can only support two frequency ranges, if will use plural frequency range, then needs to use multiple RRU.
Summary of the invention
Embodiments of the invention provide implementation method and the device of a kind of base station digital pre-distortion, in order to realize digital pre-distortion in a base station.
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 be connected with described near-end processing unit; Wherein
Near-end RF processing unit, for converting the radiofrequency signal of base station to light signal by optical transceiver, and is sent to described far end radio frequency processing unit by described light signal; By optical transceiver, the light signal from described far end radio frequency processing unit is reduced to feedback signal, described feedback signal is sent to described digital signal processing unit;
Far end radio frequency processing unit, for being reduced to radiofrequency signal by optical transceiver by the light signal received and launching; Obtain feedback signal from the output coupling of described remote equipment processing unit, by optical transceiver, described feedback signal is converted to light signal, and described light signal is sent to described near-end RF processing unit;
Digital signal processing unit, for carrying out digital pre-distortion process according to the feedback signal received.
Embodiments of the invention also propose the implementation method of a kind of base station digital pre-distortion, comprising:
Near-end RF processing unit converts the radiofrequency signal of base station to light signal by optical transceiver, and described light signal is sent to far end radio frequency processing unit;
The light signal received is reduced to radiofrequency signal by optical transceiver and launches by described far end radio frequency processing unit;
Described far end radio frequency processing unit obtains feedback signal from output coupling, by optical transceiver, described feedback signal is converted to light signal, and described light signal is sent to described near-end RF processing unit;
Light signal from described far end radio frequency processing unit is reduced to feedback signal by optical transceiver by described near-end RF processing unit, described feedback signal is sent to digital signal processing unit, and described digital signal processing unit carries out digital pre-distortion process according to the feedback signal received.
Embodiments of the invention comprise following advantage, because by light signal that Optical Fiber Transmission is converted to by radiofrequency signal between near-end RF processing unit and far end radio frequency processing unit, realize base station digital pre-distortion by light-carried wireless technology, improve the efficiency of the power amplifier of the far end radio frequency processing unit being arranged in far-end; Because the radiofrequency signal that the light signal transmitted in optical fiber is corresponding is analog signal, and the radio frequency bandwidth of optical transceiver in near-end RF processing unit and far end radio frequency processing unit can reach more than 1GHz, plural frequency range can be supported, meet the conjunction road requirement of different frequency range.
Accompanying drawing explanation
Fig. 1 is DPD implementation structure schematic diagram of the prior art;
Fig. 2 is the structural representation of the implement device of base station digital pre-distortion in the embodiment of the present invention;
Fig. 3 is optical sender in the embodiment of the present invention and the Signal transmissions schematic diagram between optical receiver;
Fig. 4 is the implementation method flow chart of the base station digital pre-distortion in the embodiment of the present invention.
Embodiment
In the embodiment of the present invention, the near-end RF processing unit (or claiming near-end RRU) being positioned at base station side converts radiofrequency signal to light signal by optical transceiver, and this light signal is sent to the far end radio frequency processing unit (or claiming far-end RRU) be separated with base station; The light signal received is reduced to radiofrequency signal by optical transceiver by far end radio frequency processing unit, uses power amplifier this radiofrequency signal to be amplified, and launches the radiofrequency signal after amplifying; Far end radio frequency processing unit obtains feedback signal from the output coupling of power amplifier, by optical transceiver, described feedback signal is converted to light signal, and this light signal is sent to near-end RF processing unit; The light signal received is reduced to feedback signal by optical transceiver by near-end RF processing unit, and this feedback signal is sent to digital signal processing unit, and digital signal processing unit carries out digital pre-distortion process according to this feedback signal.
Below in conjunction with the accompanying drawing in the present invention, carry out clear, complete description to the technical scheme in the present invention, obviously, described embodiment is a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
As shown in Figure 2, for the structural representation of the implement device of the base station digital pre-distortion in the embodiment of the present invention, comprise the form of plug backboard can being arranged at digital signal processing unit, DAC, I/Q modulator (the IQ MOD shown in figure), ADC, frequency mixer (MIXER shown in figure), the near-end RF processing unit of base station side, and be separated with base station and the far end radio frequency processing unit be connected with near-end RF processing unit by optical fiber.Wherein, digital signal processing unit can be special chip or FPGA, for realizing DUC (Digital Up Converter, Digital Up Convert), CFR (Crest Factor Reduction, crest factor reduces) and DPD; Near-end RF processing unit comprises gain module (gain block) and optical transceiver; Far end radio frequency processing unit comprises optical transceiver and PA.
At down direction, digital signal processing unit receives and processes the baseband signal from baseband processing unit (BBU), outputs signal to DAC; The output signal of digital signal processing unit is converted to intermediate-freuqncy signal by DAC, and this intermediate-freuqncy signal is sent to I/Q modulator; The intermediate-freuqncy signal received is modulated into radiofrequency signal by I/Q modulator, and this radiofrequency signal is sent to near-end RF processing unit; Near-end RF processing unit amplifies the radiofrequency signal received by gain module, by the laser in optical transceiver by amplify after radiofrequency signal convert light signal to, by this light signal by fiber optic stretch to far end radio frequency processing unit.The light signal received is reduced to radiofrequency signal by the photodiode in optical transceiver by far end radio frequency processing unit, uses power amplifier radiofrequency signal amplified and launch.
At up direction, far end radio frequency processing unit obtains feedback signal from the output coupling of power amplifier, by the laser in optical transceiver, this feedback signal is converted to light signal, and by this light signal by the near-end RF processing unit of Optical Fiber Transmission to base station side; Near-end RF processing unit, by after in photoelectricity sender, light signal is reduced to radiofrequency signal by the photodiode of lattice, can be amplified this radiofrequency signal by gain module, and the radiofrequency signal after amplifying is sent to frequency mixer; The radiofrequency signal received is mixed down intermediate-freuqncy signal by frequency mixer, and this intermediate-freuqncy signal is sent to ADC; The intermediate-freuqncy signal received is converted to digital signal by ADC, and this digital signal is sent to digital signal processing unit; Digital signal processing unit carries out DPD computing according to the digital signal received.
In addition, the upward signal sent to base station by far end radio frequency processing unit is through LNA (Low NoiseAmplifier, low noise amplifier) amplification after, also can be converted to light signal by the laser in optical transceiver, far end radio frequency processing unit by this light signal by the near-end RF processing unit of Optical Fiber Transmission to base station side; Light signal is reduced to upward signal by the photodiode of lattice in photoelectricity sender by near-end RF processing unit, and carries out subsequent operation.
As can be seen here, in the embodiment of the present invention to the processing mode of upward signal with similar to the processing mode of feedback signal.Because the processing mode to upward signal is similar with the processing mode to feedback signal, upward signal and feedback signal can be made to share same up link.Based on TDD (Time Division Duplex, time division duplex) feature of system, uplink and downlink signals separates in time domain, therefore, can when upward signal be closed, use the link transmission feedback signal of upward signal, and use the diverter switch in far end radio frequency processing unit to carry out signal switching according to particular time-slot, distinguish upward signal and feedback signal by time slot.At descending time slot, ul transmissions feedback signal; At ascending time slot, ul transmissions upward signal.
In the process of above-mentioned Signal transmissions, upward signal, feedback signal and transmitted in same optical fiber by the near-end RF processing unit downstream signal that distally RF processing unit sends, downstream signal and the upward signal that transmits in same optical fiber and feedback signal can be distinguished by wavelength-division multiplex technique by signal receiving end.Such as, downstream signal can adopt wavelength to be the laser of 1510nm, and feedback signal and upward signal can adopt wavelength to be the laser of 1310nm.In a fiber, the light signal of different wave length can not disturb mutually.At signal receiving end, optical transceiver comprises optical sender and optical receiver, both are connected to same optical fiber by wavelength division multiplexer (WDM), the function class of this wavelength division multiplexer is similar to filter, unwanted light signal can be masked, enable the correctly demodulation of downstream signal, upward signal and feedback signal out.
As shown in Figure 3, be the Signal transmissions schematic diagram between the optical sender in the embodiment of the present invention and optical receiver, 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 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 optical receiver comprises photodiode and matching unit.After optical sender receives radiofrequency signal, use amplifier and matching unit respectively radio frequency signal carry out amplifying and improve feedback, and use laser that radiofrequency signal is converted to light signal, this light signal through isolator and Optical Fiber Transmission to optical receiver.Optical receiver uses the photodiode in optical module that the light signal received is converted to radiofrequency signal, uses matching unit and amplifier carry out improvement feedback to this radiofrequency signal and transfer out after amplifying.
Optical transceiver keeps 0dB in gain, can not have gain requirements to TDD system.The deterioration of the ACPR (Adjacent Channel PowerRatio, Adjacent Channel Power Ratio) of the radio frequency signal produced due to the noise of the laser in optical sender, can be corrected by DPD technology.Meanwhile, the time delay of optical transceiver and optical fiber link maintains ns level, can not affect 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 by cable reception from the baseband signal of baseband processing unit being positioned at base station side equally, without the need to using digital light module, break away from the restriction of the speed radio frequency bandwidth of digital light module, improve the carrier wave of base-station transmission and the extensibility of frequency range; By light signal that Optical Fiber Transmission is converted to by radiofrequency signal between near-end RF processing unit and far end radio frequency processing unit, realize base station digital pre-distortion by light-carried wireless technology, improve the efficiency of the power amplifier of the far end radio frequency processing unit being arranged in far-end; Because the radiofrequency signal that the light signal transmitted in optical fiber is corresponding is analog signal, and the radio frequency bandwidth of optical transceiver in near-end RF processing unit and far end radio frequency processing unit can reach more than 1GHz, plural frequency range can be supported, meet the conjunction road requirement of different frequency range.In addition, due to power amplifier and digital signal processing unit and near-end RF processing unit are carried out separate design, reduce design difficulty, and be convenient to safeguard.Certainly, the arbitrary product implementing embodiments of the invention might not need to reach above-described all advantages simultaneously.
According to the implement device of the base station digital pre-distortion provided in above-mentioned execution mode, the embodiment of the present invention additionally provides the method for the implement device of application above-mentioned base station digital pre-distortion.
As shown in Figure 4, be the implementation method flow chart of the base station digital pre-distortion in the embodiment of the present invention, comprise the following steps:
Step 401, digital signal processing unit receives the baseband signal from baseband processing unit, and this baseband signal is exported to DAC.
Particularly, because digital signal processing unit and baseband processing unit are positioned at base station side simultaneously, both can pass through cable transmission baseband signal.
Step 402, the baseband signal received is converted to intermediate-freuqncy signal by DAC, and this intermediate-freuqncy signal is sent to I/Q modulator.
Step 403, the intermediate-freuqncy signal received is modulated into radiofrequency signal by I/Q modulator, and this radiofrequency signal is sent to near-end RF processing unit.
Step 404, near-end RF processing unit converts radiofrequency signal to light signal by optical transceiver, this light signal is sent to the far end radio frequency processing unit be separated with base station.
Wherein, near-end RF processing unit comprises gain module and optical transceiver, can be amplified the radiofrequency signal received by gain module, convert the radiofrequency signal after being amplified by optical transceiver to light signal, and use optical fiber that the light signal be converted to is sent to far end radio frequency processing unit.
Step 405, the light signal received is reduced to radiofrequency signal by optical transceiver by far end radio frequency processing unit, uses power amplifier radiofrequency signal to be amplified, and launches the radiofrequency signal after amplifying.
Step 406, far end radio frequency processing unit obtains feedback signal from the output coupling of power amplifier, by optical transceiver, this feedback signal is converted to light signal, and this light signal is sent to near-end RF processing unit.
Step 407, the light signal received is reduced to radiofrequency signal by optical transceiver by near-end RF processing unit, and is sent to frequency mixer.
Particularly, after light signal is reduced to radiofrequency signal by near-end RF processing unit, can be amplified this radiofrequency signal by gain module, and the radiofrequency signal after amplifying is sent to frequency mixer.
Step 408, the radiofrequency signal received is mixed down intermediate-freuqncy signal by frequency mixer, and this intermediate-freuqncy signal is sent to ADC.
Step 409, the intermediate-freuqncy signal received is converted to digital signal by ADC, and this digital signal is sent to digital signal processing unit.
Step 410, digital signal processing unit carries out DPD computing according to the digital signal received.
In the embodiment of the present invention, far end radio frequency processing unit can also amplify upward signal by low noise amplifier, and be converted to light signal by the upward signal after low noise amplifier amplifies by optical transceiver, and this light signal is sent to near-end RF processing unit; The light signal received is reduced to upward signal by optical transceiver by near-end RF processing unit.Upward signal and feedback signal can share same up link, and this up link transmits feedback signal at descending time slot, at ascending time slot transmission upward signal.
Optical transceiver in the embodiment of the present invention comprises optical sender and optical receiver, optical sender and optical receiver are connected to same optical fiber by wavelength division multiplexer, upward signal, feedback signal and by near-end RF processing unit distally RF processing unit send downstream signal transmit in same optical fiber, downstream signal and upward signal and feedback signal are distinguished by wavelength division multiplexer by the signal receiving end at optical transceiver place, and distinguish upward signal and feedback signal by time slot.
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 by cable reception from the baseband signal of baseband processing unit being positioned at base station side equally, without the need to using digital light module, break away from the restriction of the speed radio frequency bandwidth of digital light module, improve the carrier wave of base-station transmission and the extensibility of frequency range; By light signal that Optical Fiber Transmission is converted to by radiofrequency signal between near-end RF processing unit and far end radio frequency processing unit, realize base station digital pre-distortion by light-carried wireless technology, improve the efficiency of the power amplifier of the far end radio frequency processing unit being arranged in far-end; Because the radiofrequency signal that the light signal transmitted in optical fiber is corresponding is analog signal, and the radio frequency bandwidth of optical transceiver in near-end RF processing unit and far end radio frequency processing unit can reach more than 1GHz, plural frequency range can be supported, meet the conjunction road requirement of different frequency range.In addition, due to power amplifier and digital signal processing unit and near-end RF processing unit are carried out separate design, reduce design difficulty, and be convenient to safeguard.Certainly, the arbitrary product implementing embodiments of the invention might not need to reach above-described all advantages simultaneously.
It will be appreciated by those skilled in the art that the module in the device in embodiment can carry out being distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add required general hardware platform by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, technical scheme of the present invention can embody with the form of software product the part that prior art contributes in essence in other words, this computer software product is stored in a storage medium, comprising some instructions in order to make a station terminal equipment (can be mobile phone, personal computer, server, or the network equipment etc.) perform method described in each embodiment of the present invention.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should look protection scope of the present invention.

Claims (6)

1. an implement device for base station digital pre-distortion, is characterized in that, comprising: near-end RF processing unit and connected far end radio frequency processing unit, and the digital signal processing unit be connected with described near-end RF processing unit; Wherein
Near-end RF processing unit, for converting the radiofrequency signal of base station to light signal by optical transceiver, and is sent to described far end radio frequency processing unit by described light signal; By optical transceiver, the light signal from described far end radio frequency processing unit is reduced to feedback signal, described feedback signal is sent to described digital signal processing unit; By optical transceiver, the light signal received is reduced to upward signal;
Far end radio frequency processing unit, for being reduced to radiofrequency signal by optical transceiver by the light signal received and launching; Obtain feedback signal from the output coupling of described far end radio frequency processing unit, by optical transceiver, described feedback signal is converted to light signal, and described light signal is sent to described near-end RF processing unit; Amplify upward signal by low noise amplifier, and be converted to light signal by the upward signal after described low noise amplifier amplifies by optical transceiver, and described light signal is sent to described near-end RF processing unit;
Digital signal processing unit, for carrying out digital pre-distortion process according to the feedback signal received;
Wherein, described optical transceiver comprises optical sender, optical receiver and wavelength division multiplexer, and described optical sender and optical receiver are connected to same optical fiber by described wavelength division multiplexer;
Described optical fiber, for the downstream signal transmitting described upward signal, described feedback signal and sent to described far end radio frequency processing unit by described near-end RF processing unit;
Described wavelength division multiplexer, for distinguishing described downstream signal and described upward signal and described feedback signal;
The signal receiving end at described optical transceiver place is used for distinguishing described upward signal and described feedback signal by time slot.
2. device as claimed in claim 1, it is characterized in that, described near-end RF processing unit is positioned at base station side, and this unit comprises: gain module and optical transceiver; Wherein
Described gain module, for amplifying the radiofrequency signal of base station and the feedback signal from described optical transceiver, and is sent to described digital signal processing unit by the feedback signal after amplifying;
Described optical transceiver, for the radiofrequency signal of the base station after described gain module amplifies is converted to light signal and is sent to described far end radio frequency processing unit, and is reduced to feedback signal by the light signal from described far end radio frequency processing unit;
Described far end radio frequency processing unit is positioned at antenna side, and this unit comprises: power amplifier and optical transceiver; Wherein
Described optical transceiver is used for the light signal received to be reduced to radiofrequency signal, and feedback signal is converted to light signal and is sent to described near-end RF processing unit;
Described power amplifier is for amplifying the radiofrequency signal from described optical transceiver.
3. device as claimed in claim 1, it is characterized in that, described upward signal and described feedback signal share same up link, and described up link transmits described feedback signal at descending time slot, transmit described upward signal at ascending time slot.
4. an implementation method for the base station digital pre-distortion realized with the implement device of the base station digital pre-distortion described in any one of claims 1 to 3, is characterized in that, comprising:
Near-end RF processing unit converts the radiofrequency signal of base station to light signal by optical transceiver, and described light signal is sent to far end radio frequency processing unit;
The light signal received is reduced to radiofrequency signal by optical transceiver and launches by described far end radio frequency processing unit;
Described far end radio frequency processing unit obtains feedback signal from output coupling, by optical transceiver, described feedback signal is converted to light signal, and described light signal is sent to described near-end RF processing unit;
Light signal from described far end radio frequency processing unit is reduced to feedback signal by optical transceiver by described near-end RF processing unit, described feedback signal is sent to digital signal processing unit, and described digital signal processing unit carries out digital pre-distortion process according to the feedback signal received;
Wherein, also comprise:
Described far end radio frequency processing unit amplifies upward signal by low noise amplifier, and is converted to light signal by the upward signal after described low noise amplifier amplifies by optical transceiver, and described light signal is sent to described near-end RF processing unit;
The light signal received is reduced to upward signal by optical transceiver by described near-end RF processing unit;
Described optical transceiver comprises optical sender and optical receiver, described optical sender and optical receiver are connected to same optical fiber by wavelength division multiplexer, described upward signal, described feedback signal and the downstream signal sent to described far end radio frequency processing unit by described near-end RF processing unit transmit in same optical fiber, described downstream signal and described upward signal and described feedback signal are distinguished by described wavelength division multiplexer by the signal receiving end at described optical transceiver place, and distinguish described upward signal and described feedback signal by time slot.
5. method as claimed in claim 4, is characterized in that,
Described near-end RF processing unit converts the radiofrequency signal of base station to light signal by optical transceiver, and described light signal is sent to far end radio frequency processing unit, comprising:
Gain module amplifies the radiofrequency signal of described base station;
The radiofrequency signal of the base station after described gain module amplifies is converted to light signal and is sent to described far end radio frequency processing unit by optical transceiver;
Light signal from described far end radio frequency processing unit is reduced to feedback signal by optical transceiver by described near-end RF processing unit, described feedback signal is sent to digital signal processing unit, comprises:
Light signal from described far end radio frequency processing unit is reduced to feedback signal by optical transceiver;
Gain module amplifies the feedback signal from described optical transceiver, and the feedback signal after amplifying is sent to described digital signal processing unit.
6. method as claimed in claim 4, it is characterized in that, described upward signal and described feedback signal share same up link, and described up link transmits described feedback signal at descending time slot, transmit described upward signal at ascending time slot.
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