CN103379504B - A kind of distributed base station system and its method of data processing - Google Patents
A kind of distributed base station system and its method of data processing Download PDFInfo
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- CN103379504B CN103379504B CN201210110879.6A CN201210110879A CN103379504B CN 103379504 B CN103379504 B CN 103379504B CN 201210110879 A CN201210110879 A CN 201210110879A CN 103379504 B CN103379504 B CN 103379504B
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Abstract
The invention discloses a kind of distributed base station system and its methods of data processing, are related to wireless communication technique, the method includes：The digital signal processing module of base station sends forward signal to the distributed node of base station；The forward signal is converted to radiofrequency signal by the distributed node；The ultramagnifier of base station, which samples and handles the radiofrequency signal, obtains feedback signal, and the feedback signal is sent to non-linear distortion rectifier；The non-linear distortion rectifier forward signal is corrected according to the feedback signal after forward signal and be sent to distributed node；The distributed node is sent to user terminal after the forward signal after the correction is converted to radiofrequency signal.The present invention solves the problems, such as that the nonlinear distortion question of each radio frequency units of the DAS of base station and base station computational complexity are high, and there is attenuating nonlinear device to be influenced on the performance of distributing antenna system and reduce the advantageous effect of base station computational complexity.
Description
Technical field
The present invention relates to wireless communication technique, more particularly to the method for a kind of distributed base station system and its data processing.
Background technology
The new generation of wireless communication technology, due to mostly using OFDM (Orthogonal Frequency Division
Multiplexing, orthogonal frequency division multiplexing) technology and identical networking, community marginal user performance can be caused to decline.Meanwhile OFDM
It is excessively high to also result in power PAR so that the saturation region of signal amplitude ingoing power amplifier even cut-off region.Signal passes through
After power amplifier, since power amplifier is non-linear in the presentation of the two working regions, the accuracy of radiofrequency signal can be influenced.
MIMO (Multiple Input Multiple Output, multi-antenna technology) can fight channel fading and raising system is held
Amount, but base station transmitting power can be promoted than traditional base station in practical applications.
Fig. 1 is a kind of structural schematic diagram for distributed base station system that the prior art provides, as shown in Figure 1, the system
Including CU (Central Unit, central location) and RU (Remote Unit, far-end unit),.RU is more days distributed by what is zoomed out
Line and radio frequency unit composition are terminal service, and CU is responsible for the Digital Signal Processing of all RU, and CU and RU (including antenna) pass through light
Fibre connection.
DAS (Distributed Antenna System, distributing antenna system) is to solve indoor and complicated city
City's environment signal covering and capacity problem and propose.DAS is widely distributed by multiple small size antennas, passes through optical cable, coaxial electrical
Antenna is connected by cable etc. with processing base station, and the signal transmitting and receiving for handling all antennas is uniformly controlled by processing base station.In DAS system
In, mutiple antennas is distributed in the different location in the same region, and the virtual subdistrict of customer-centric is instead of traditional with base
Cellular cell centered on standing is equivalent to and the radio frequency unit of multi-antenna base station is zoomed out, and the radio frequency unit configuration each zoomed out is only
Vertical antenna.DAS can make up the defect of above-mentioned OFDM and MIMO technology to a certain extent, promote the property of Cell Edge User
Can, reduce base station power consumption.But DAS has the following disadvantages：There are non-linear distortion and base station computational complexities for each radio frequency unit
It is high.
Invention content
The purpose of the present invention is to provide a kind of distributed base station system and its data processing methods, can preferably solve
The high problem of the nonlinear distortion question and base station computational complexity of each radio frequency units of DAS of base station.
According to an aspect of the invention, there is provided a kind of distributed base station system data processing method, the method packet
It includes：
The digital signal processing module of base station sends forward signal to the distributed node of base station；
The forward signal is converted to radiofrequency signal by the distributed node；
The ultramagnifier of base station, which samples and handles the radiofrequency signal, obtains feedback signal, and the feedback signal is sent to
Non-linear distortion rectifier；
The non-linear distortion rectifier corrects after obtaining correction the forward signal according to the feedback signal
Forward signal and be sent to distributed node；
The distributed node is sent to user terminal after the forward signal after the correction is converted to radiofrequency signal.
Preferably, the step that the non-linear distortion rectifier corrects the forward signal according to the feedback signal
Suddenly include：
Power amplifier model ginseng is sought according to the feedback signal, preceding forward signal and pre-set distortion model
Number；
The forward signal is corrected according to the feedback signal, the power amplifier model parameter, the distortion model.
Preferably, the step that the non-linear distortion rectifier corrects the forward signal according to the feedback signal
Suddenly include：
According to the feedback signal of the power amplifier of the distributed node, preceding forward signal and pre-set
Distortion model seeks power amplifier model parameter；
According to the feedback signal of the photoelectric device of the distributed node, preceding forward signal and pre-set mistake
True mode seeks photoelectricity model parameter；
According to the feedback signal of the power amplifier, the power amplifier model parameter, the distortion model correction it is described before
The forward signal after power amplifier correction is obtained to signal；
The power amplifier is corrected according to the feedback signal of the photoelectric device, the photoelectricity model parameter, the distortion model
Forward signal after correction.
Preferably, the step that the non-linear distortion rectifier corrects the forward signal according to the feedback signal
Further include before rapid：
The controller of base station by the feedback signal and the forward signal synchronize be input to non-linear distortion rectifier with
The forward signal is corrected according to the feedback signal for the non-linear distortion rectifier.
Preferably, the step of seeking power amplifier model parameter include：
According to the feedback signal of the model of the power amplifier and power divider power amplifier；
Power amplifier model parameter is sought according to feedback signal, preceding forward signal and the distortion model after division.
According to another aspect of the present invention, a kind of distributed base station system is provided, the system comprises：
Digital signal processing module, for sending forward signal to the distributed node of base station；
Distributed node for the forward signal to be converted to radiofrequency signal, and non-linear distortion rectifier is corrected
Forward signal afterwards is converted to radiofrequency signal and is sent to user terminal；
Ultramagnifier obtains feedback signal for sampling and handling the radiofrequency signal, and the feedback signal is sent to
Non-linear distortion rectifier；
Non-linear distortion rectifier, for being corrected after obtaining correction to the forward signal according to the feedback signal
Forward signal and be sent to distributed node.
Preferably, the non-linear distortion rectifier includes：
Power amplifier model parameter seeks module, for according to the feedback signal, preceding forward signal and pre-setting
Distortion model seek power amplifier model parameter；
Power amplifier non-linear distortion rectification module, for according to the feedback signal, the power amplifier model parameter, the distortion
Model corrects the forward signal.
Preferably, the non-linear distortion rectifier includes：
Power amplifier model parameter seeks module, for according to the feedback signal of the power amplifier of the distributed node,
Preceding forward signal and pre-set distortion model seek power amplifier model parameter；
Power amplifier non-linear distortion rectification module, for feedback signal, the power amplifier model according to the power amplifier
Parameter, the distortion model correct the forward signal；
Photoelectricity model parameter seeks module, for according to the feedback signal of the photoelectric device of distributed node, it is preceding before
Photoelectricity model parameter is sought to signal and pre-set distortion model；
Photoelectricity non-linear distortion rectification module, for being joined according to the feedback signal of the photoelectric device, the photoelectricity model
Several, the described distortion model corrects the forward signal after the power amplifier non-linear distortion rectification module correction.
Preferably, the system also includes：
Controller, for by the feedback signal and the forward signal synchronize be input to non-linear distortion rectifier with
The forward signal is corrected according to the feedback signal for the non-linear distortion rectifier.
Preferably, the power amplifier model parameter seek module be additionally operable to according to the model and power of the power amplifier draw
Divide the feedback signal of power amplifier and is asked according to feedback signal, preceding forward signal and the distortion model after division
Take power amplifier model parameter.
Compared with prior art, the beneficial effects of the present invention are：It is non-linear to lower power amplifier, photoelectric device etc.
Device influences the performance of distributing antenna system, and reduces the hardware consumption and base station operation complexity of non-linear correction operation
Degree.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram for distributed base station system that the prior art provides；
Fig. 2 is a kind of flow chart of the data processing method for distributed base station system that the embodiment of the present invention one provides；
Fig. 3 is a kind of number of distributed base station system using analog optical fiber transmission data provided by Embodiment 2 of the present invention
According to the flow chart of processing method；
Fig. 3 a are that the function module that power amplifier non-linear distortion correction model parameter provided by Embodiment 2 of the present invention is sought is shown
It is intended to；
Fig. 3 b are the high-level schematic functional block diagrams that photoelectricity model parameter provided by Embodiment 2 of the present invention is sought；
Fig. 3 c are the high-level schematic functional block diagrams of peak clipping provided by Embodiment 2 of the present invention and non-linear distortion correction；
Fig. 3 d are a kind of downlinks of the distributed base station system of analog optical fiber transmission data provided by Embodiment 2 of the present invention
The schematic diagram of link；
Fig. 4 is a kind of number for distributed base station system using digital optical fiber transmission data that the embodiment of the present invention three provides
According to the flow chart of processing method；
Fig. 4 a are the high-level schematic functional block diagrams of the peak clipping that the embodiment of the present invention three provides and non-linear distortion correction；
Fig. 4 b are the downlink chains for the distributed base station system that the present invention implements a kind of digital optical fiber transmission data that three provide
The schematic diagram on road；
Fig. 5 is the high-level schematic functional block diagram that the present invention implements the distributed base station system that four provide.
Specific implementation mode
Below in conjunction with attached drawing to a preferred embodiment of the present invention will be described in detail, it should be understood that described below is excellent
Select embodiment only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Fig. 2 is a kind of flow chart of the data processing method for distributed base station system that the embodiment of the present invention one provides, such as
Shown in Fig. 2, the method includes：
The digital signal processing module of step S201, base station send forward signal to the distributed node of base station.
When base station is to user terminal transmission data, the digital signal processing module of base station carries out Base-Band Processing to forward signal
And peak clipping processing, and by the distributed node of treated forward signal is sent to base station under the control of base station controller.
The forward signal is converted to radiofrequency signal by step S202, the distributed node.
The forward signal received is converted to radiofrequency signal by distributed node.
The ultramagnifier of step S203, base station, which sample and handles the radiofrequency signal, obtains feedback signal, and by the feedback
Signal is sent to non-linear distortion rectifier.
The radiofrequency signal of the ultramagnifier sample distribution formula node of base station, and radiofrequency signal is handled, obtain feedback letter
Number, feedback signal is then sent to non-linear distortion rectifier.
Step S204, the non-linear distortion rectifier to the forward signal correct according to the feedback signal
Forward signal after to correction is simultaneously sent to distributed node.
When controller is connected with distributed node by digital fiber, the non-linear distortion of the sides RU of communication system is main
It is caused by power amplifier；When controller is connected with distributed node by analog optical fiber, non-linear distortion is in addition to by power
Amplifier further includes distortion caused by photoelectric device except causing.
In the case of digital fiber connects, the radiofrequency signal of the power amplifier output of ultramagnifier sample distribution formula node
And it handles and obtains the feedback signal of power amplifier.Non-linear distortion rectifier includes that power amplifier model parameter seeks module and power amplifier
Non-linear distortion rectification module.Power amplifier model parameter is sought module according to feedback signal, preceding forward signal and is set in advance
The distortion model set seeks power amplifier model parameter.The current forward signal and ultramagnifier feedback of digital signal processing module output
The feedback signal corresponding to above-mentioned current forward signal back under the control of the controller, synchronizes and is input to non-linear distortion
In rectifier.The power amplifier non-linear distortion rectification module of non-linear distortion rectifier is further according to feedback signal, required taking-up
Power amplifier model parameter and pre-set distortion model correct current forward signal.
In the case of analog optical fiber connects, the radiofrequency signal of the power amplifier output of ultramagnifier sample distribution formula node
And handle and obtain the feedback signal of power amplifier, while the radiofrequency signal of the photoelectric device output of sample distribution formula node and place
Reason obtains the feedback signal of photoelectric device output.Non-linear distortion rectifier includes that power amplifier model parameter seeks module, photoelectricity mould
Shape parameter seeks module, power amplifier non-linear distortion rectification module and photoelectricity non-linear distortion rectification module.Non-linear distortion is corrected
The power amplifier model parameter of device seeks module according to the feedback signal of power amplifier, preceding forward signal and pre-set
Distortion model seeks power amplifier model parameter.The current forward signal and ultramagnifier feedback of the digital signal processing module output of CU
The feedback signal of the power amplifier corresponding to above-mentioned current forward signal back is under the control of the controller, synchronous to input
Into non-linear distortion rectifier.The power amplifier non-linear distortion rectification module of non-linear distortion rectifier is further put according to power
The big feedback signal of device, the power amplifier model parameter of required taking-up and pre-set distortion model correct current forward signal
And obtain the forward signal after power amplifier correction.Meanwhile photoelectricity model parameter seeks photoelectricity of the module according to the distributed node
The feedback signal of device, preceding forward signal and pre-set distortion model seek photoelectricity model parameter.The number of CU
Signal processing module exports the feedback for the photoelectric device corresponding to above-mentioned forward signal that forward signal and ultramagnifier are fed back
Signal under the control of the controller, synchronizes and is input to the photoelectricity model parameter of non-linear distortion rectifier and seeks in module.Photoelectricity
Non-linear distortion rectification module is rectified according to the feedback signal, the photoelectricity model parameter, the distortion model of the photoelectric device
Forward signal after just above-mentioned power amplifier correction.
Non-linear distortion rectifier will pass through power amplifier non-linear distortion rectification module and photoelectricity non-linear distortion rectification module
Forward signal after correction is sent to distributed node.
Step S205, the distributed node are sent to use after the forward signal after the correction is converted to radiofrequency signal
Family terminal.
Forward signal after correction is converted to radiofrequency signal by distributed node, and is sent to user terminal.
Fig. 3 is a kind of number of distributed base station system using analog optical fiber transmission data provided by Embodiment 2 of the present invention
According to the flow chart of processing method.Distributed base station system in the present embodiment includes CU and two RU, and there are four each RU
Transmitting antenna, CU and RU are connected by analog signal optical fiber, and use CWDM (Coarse Wavelength Division
Multiplexing, coarse wavelength division multiplexer) technology.As shown in figure 3, the method includes：
Step S301, forward signal processing.
Forward signal refers to being transmitted to the transmitting terminal i.e. signal of distributed node from the digital signal processing module of base station.When
When base station is to user terminal transmission data, the digital signal processing module of base station carries out at Base-Band Processing and peak clipping forward signal
Reason.
Since the power PAR of signal is high, the amplitude of certain time-ofday signals is caused to have exceeded power amplifier or photoelectric device
Normal range of operation, reduce the efficiency of power amplifier, and this amplitude enters the cut-off region or photodiode of power amplifier
Cut-off region can cause the distortion for closing on frequency domain channel signal, thus cut down signal of the amplitude beyond threshold value, be lost with reducing
It is influenced caused by true.
When peak clipping, each antenna of each RU independently carries out peak clipping processing, and the forward signal after all peak clippings enters non-thread
Property distortion rectifier centralized processing.Specifically, peak clipping is the forward signal for each antenna, and non-linear distortion correction can
Handle with processing one or simultaneously the signal of mutiple antennas feedback.Peak clipping is to carry out data processing in digital intermediate frequency.
Forward signal is sent to non-linear distortion rectifier after digital signal processing module is handled.
Step S302 seeks non-linear distortion correction model parameter.
When carrying out non-linear distortion correction, need to first pass through a training process, i.e., with the signal being distorted and originally
The distortion correction model parameter h for the signal estimation system not being distortedP, m, distortion model therein is previously selected, but model
The each device of parameter is different, needs specifically to solve, solving model parameter hP, mProcess be exactly training process.
Seek power amplifier non-linear distortion correction model parameter.Fig. 3 a are the non-linear mistakes of power amplifier provided by Embodiment 2 of the present invention
The high-level schematic functional block diagram that true correction model parameter is sought, within one section of processing time, the signal in same power bracket uses
Identical non-linear distortion corrects parameter.As shown in Figure 3a, the process for seeking model parameter is as follows：The forward signal of antenna a into
The peak clipping unit for entering digital signal processing module carries out peak clipping processing.Power amplifier feedback signal is defeated from all transmitting antenna power amplifiers
The quantified digital signal of outlet, power amplifier feedback signal are input to the power amplifier feedback signal stroke that power amplifier model parameter seeks module
Subdivision, power amplifier feedback signal division unit divide power amplifier feedback signal according to the power and model of power amplifier, specifically
It says, the feedback signal of the equal-wattage from same model power amplifier is divided into same by power amplifier feedback signal division unit
Group.After via controller synchronizes, the preceding forward signal after peak clipping and the signal after power divider enter power amplifier model parameter
The power amplifier model parameter for seeking module seeks the parameter that unit seeks power amplifier model.Forward signal after peak clipping is not by distortion
Correction is routed directly to the distributed node of antenna a.
Seek photoelectricity model parameter.Fig. 3 b are the function modules that photoelectricity model parameter provided by Embodiment 2 of the present invention is sought
Schematic diagram, within 100 milliseconds of times, the signal in same power bracket corrects parameter using identical non-linear distortion.Such as figure
Shown in 3b, the forward signal of antenna a enters the peak clipping unit progress peak clipping processing of digital signal processing module.Electro-optical feedback is believed
Number refer to from the quantified digital signal of the photoactor output end of all distributed nodes.Electro-optical feedback signal is defeated
Enter to photoelectricity model parameter to seek the electro-optical feedback signal division unit of module, electro-optical feedback signal division unit is according to phototube
The model and power of part divide electro-optical feedback signal, the feedback letter of the equal-wattage from same model photoelectric device
Number it is divided into same group.After via controller synchronizes, the preceding forward signal after peak clipping and the feedback signal after power divider
The photoelectricity model parameter that module is sought into photoelectricity model parameter seeks unit and seeks photoelectricity model parameter.Forward direction letter after peak clipping
Number without being routed directly to the distributed node of antenna a by distortion correction.
Step S303 carries out non-linear distortion correction.
In the emitting side of communication system, non-linear distortion is mainly caused by power amplifier, is also caused including signal processing
Distortion such as peak clipping.The present embodiment controller is connected with distributed node by analog signal optical fiber, then non-linear distortion is corrected
Further include being caused to optical fiber transmission and photoelectricity/electro-optic conversion other than including the correction of non-linear distortion caused by power amplifier
Non-linear distortion correction.Because photoelectric device is different with power amplifier element characteristic, mould is corrected using different distortions
Block.
Fig. 3 c are the high-level schematic functional block diagrams of peak clipping provided by Embodiment 2 of the present invention and non-linear distortion correction, such as Fig. 3 c
Shown, the forward signal after peak clipping is routed directly to corresponding distributed node under the control of the controller, and without non-linear
It is distorted rectifier.Distributed node carries out processing to the forward signal after peak clipping and generates radiofrequency signal.Ultramagnifier sample distribution formula
The power amplifier feedback signal of the nonlinear devices such as the power discharging device of the node and power amplifier for feeding back to non-linear distortion rectifier is non-linear
It is distorted rectification module.After via controller synchronizes, forward signal and power amplifier feedback signal after preceding peak clipping are input to non-linear
Be distorted rectification module, power amplifier non-linear distortion rectification module according to power amplifier feedback signal to the forward signal after current peak clipping into
Row non-linear correction.Meanwhile the electro-optical feedback signal of the nonlinear devices such as photoelectric device of ultramagnifier sample distribution formula node is simultaneously
Feed back to non-linear distortion rectifier.Forward signal after the correction of power amplifier non-linear distortion rectification module output and electro-optical feedback
Signal synchronizes the photoelectricity non-linear distortion rectification module for being input to non-linear distortion rectifier, photoelectricity non-linear distortion rectification module
Non-linear correction is carried out to the forward signal after correction according to electro-optical feedback signal.
Step S304 handles the data after correction.
Fig. 3 d are a kind of downlinks of the distributed base station system of analog optical fiber transmission data provided by Embodiment 2 of the present invention
The schematic diagram of link, as shown in Figure 3d, the digital signal processing module of CU carries out Base-Band Processing to forward signal and peak clipping is handled,
And will treated that data are sent to non-linear distortion rectifier corrects, the DAC of CU converts the digital signal after correction
At analog signal.The filtered device of analog signal is converted into optical signal through electro-optical conversion again after being filtered, then by being combined
Device carries out after synthesis processing through being sent to RU by optical fiber.
RU receive CU transmission optical signal after, through splitter by optical signal branch, then through light-to-current inversion by optical signal turn
It changes electric signal into, exports radio frequency letter then electric signal to be modulated to transmitting frequency range through up-conversion after after power amplifier amplifies
Number.
Step S305 emits radiofrequency signal.
The radiofrequency signal that antenna receives power amplifier is transmitted to user terminal.
Fig. 4 is a kind of number for distributed base station system using digital optical fiber transmission data that the embodiment of the present invention three provides
According to the flow chart of processing method.Distributed base station system in the present embodiment includes CU and two RU, and there are four each RU
Transmitting antenna, CU and RU are connected by digital signal optical fiber.As shown in figure 4, the method includes：
Step S401, forward signal processing.
Forward signal refers to the signal that transmitting terminal is transmitted to from the digital signal processing module of base station.When base station is whole to user
When holding transmission data, the digital signal processing module of base station carries out the processing such as Base-Band Processing and peak clipping to forward signal.
Step S402 seeks power amplifier non-linear distortion correction model parameter.
Step S403 carries out the non-linear distortion correction of power amplifier.
Fig. 4 a are the high-level schematic functional block diagrams of the peak clipping that the embodiment of the present invention three provides and non-linear distortion correction, are such as schemed
Shown in 4a, the forward signal after peak clipping is routed directly to corresponding distributed node under the control of the controller, and without distortion
Rectifier.Distributed node carries out processing to the forward signal after peak clipping and generates radiofrequency signal.Ultramagnifier sample distribution formula node
The power amplifier feedback signal of nonlinear devices such as power discharging device and feed back to the power amplifier non-linear distortion of non-linear distortion rectifier
Correction process unit.After via controller synchronizes, forward signal and power amplifier feedback signal after peak clipping are input to non-linear distortion and rectify
The power amplifier non-linear distortion rectification module of positive device, power amplifier non-linear distortion rectification module according to power amplifier feedback signal to peak clipping after
Current forward signal carries out non-linear correction.Specifically, can be obtained the letter after correction according to distortion correction model y=Xh
Number.Wherein, h is the correction model parameter that power amplifier model parameter seeks that module is determined in step S402, and y is the signal after correction, X
It is forward signal.
Step 404, the data after correction are handled.
Fig. 4 b are the downlink chains for the distributed base station system that the present invention implements a kind of digital optical fiber transmission data that three provide
The schematic diagram on road, as shown in Figure 4 b, by treated, data are input to after the digital signal processing module progress forward signal processing of CU
Non-linear distortion rectifier is corrected, and the filter of CU is filtered the digital signal after correction, then through electro-optical conversion
Module converts electrical signals to optical signal, multiple connection is carried out to optical signal using multiplexer, then by multiplexer treated light
Signal is sent to RU through optical fiber.
After RU receives the optical signal of CU transmissions, through solving multiplexer by optical signal solution multiple connection, using photoelectric conversion units
The optical signal for solving multiple connection is converted into electric signal, digital electric signal is then converted to by analog electrical signal by DAC, most afterwards through upper
Analog electrical signal is modulated to after transmitting frequency range and exports radiofrequency signal after power amplifier amplifies by frequency conversion.
CU and RU is the prior art to the process flow of data, and details are not described herein again.
Step S405 emits radiofrequency signal.
The radiofrequency signal that antenna receives power amplifier output is transmitted to user terminal.
Fig. 5 is the high-level schematic functional block diagram that the present invention implements the distributed base station system that four provide, as shown in figure 5, described
Base station system includes：RU and CU.Wherein RU includes multiple distributed nodes and ultramagnifier, and CU includes controller, non-linear mistake
True rectifier, digital signal processing module.
Digital signal processing module is used to send forward signal to the distributed node of base station.
Distributed node is used to the forward signal being converted to radiofrequency signal, and will be after the correction of non-linear distortion rectifier
Forward signal be converted to radiofrequency signal and be sent to user terminal.Distributed node include at least one or more antenna and
The corresponding power amplifier of each antenna.
Ultramagnifier obtains feedback signal for sampling and handle the radiofrequency signal, and the feedback signal is sent to non-
Linear distortion rectifier；
Non-linear distortion rectifier is for correcting after obtaining correction the forward signal according to the feedback signal
Forward signal and be sent to distributed node.Non-linear distortion rectifier rectifys signal using determining mathematical model
Just, the parameter of the mathematical model is calculated by feedback signal and forward signal.It is identical for power in certain time
Signal, non-linear distortion rectifier use identical model parameter.The model of the nonlinear device of all same technique specifications is joined
Number consists of two parts, all with rule in certain error (error for referring to forward signal feedback signal corresponding with its) range
The power amplifier of lattice uses identical parameter.Optionally, the non-linear distortion correction model parameter except error range can root
It is respectively determined according to the signal of each power amplifier.
In the case of digital fiber connects RU and CU, non-linear distortion rectifier includes that power amplifier model parameter seeks module
With power amplifier non-linear distortion rectification module.Ultramagnifier sample distribution formula node power amplifier output radiofrequency signal and processing
Obtain the feedback signal of power amplifier.The current forward signal and ultramagnifier of digital signal processing module output is fed back
The feedback signal corresponding to above-mentioned forward signal under the control of the controller, synchronize and be input in non-linear distortion rectifier.
The power amplifier model parameter of non-linear distortion rectifier is sought module according to feedback signal, preceding forward signal and is pre-set
Distortion model seek power amplifier model parameter；The further basis of the power amplifier non-linear distortion rectification module of non-linear distortion rectifier
Feedback signal, the power amplifier model parameter of required taking-up and pre-set distortion model correct current forward signal.
In the case of analog optical fiber connects, non-linear distortion rectifier includes that power amplifier model parameter seeks module, power amplifier
Non-linear distortion rectification module, photoelectricity model parameter seek module and photoelectricity non-linear distortion rectification module.Power amplifier model parameter
The function of module and power amplifier non-linear distortion rectification module is sought with described in digital fiber coupling part, details are not described herein again.Number
The photoelectric device corresponding to above-mentioned forward signal that the forward signal and ultramagnifier of word signal processing module output are fed back
Feedback signal under the control of the controller, is synchronized and is input in non-linear distortion rectifier.Photoelectricity model parameter seeks module root
It is sought according to the feedback signal of the photoelectric device of the distributed node, preceding forward signal and pre-set distortion model
Photoelectricity model parameter；Photoelectricity non-linear distortion rectification module is joined according to the feedback signal of the photoelectric device, the photoelectricity model
Forward signal after several, the described distortion model correction power amplifier non-linear distortion rectification module correction.
Controller, for by the feedback signal and the forward signal synchronize be input to non-linear distortion rectifier for
The non-linear distortion rectifier corrects the data according to the feedback signal.Controller is additionally operable to selection distributed node
Signal is controlled with other are generated.Specifically, controller selects one or more day also according to the channel information that terminal is fed back
Line is terminal transmission data, e.g., Signal to Interference plus Noise Ratio, received signal strength, channel relevancy etc..Plurality of antenna may belong to together
One or more distributed node.Controller also provides respective time synchronization for the processing of the data transmit-receive of each antenna.
In conclusion the present invention solves each radio frequency units of DAS of base station by the distorted signal of correction nonlinear device
Nonlinear distortion question and the high problem of base station computational complexity, have that lower power amplifier, photoelectric device etc. non-thread
Property device the performance of distributing antenna system is influenced and reduce non-linear correction operation hardware consumption and base station operation it is complicated
The advantageous effect of degree.Although describing the invention in detail above, but the invention is not restricted to this, the art technology
Personnel can be carry out various modifications with principle according to the present invention.Therefore, all to be changed according to made by the principle of the invention, it should all manage
Solution is to fall into protection scope of the present invention.
Claims (10)
1. a kind of method of distributed base station system data processing, which is characterized in that the described method comprises the following steps：
The digital signal processing module of base station sends forward signal to the distributed node of base station；
The forward signal is converted to radiofrequency signal by the distributed node；
The ultramagnifier of base station, which samples and handles the radiofrequency signal, obtains feedback signal, and the feedback signal is sent to non-thread
Property distortion rectifier；
The non-linear distortion rectifier forward signal is corrected according to the feedback signal after before
To signal and it is sent to distributed node；
The distributed node is sent to user terminal after the forward signal after the correction is converted to radiofrequency signal.
2. according to the method described in claim 1, it is characterized in that, the non-linear distortion rectifier is according to the feedback signal
The step of being corrected to the forward signal include：
Power amplifier model parameter is sought according to the feedback signal, preceding forward signal and pre-set distortion model；
The forward signal is corrected according to the feedback signal, the power amplifier model parameter, the distortion model.
3. according to the method described in claim 1, it is characterized in that, the non-linear distortion rectifier is according to the feedback signal
The step of being corrected to the forward signal include：
According to the feedback signal of the power amplifier of the distributed node, preceding forward signal and pre-set distortion
Model seeks power amplifier model parameter；
According to the feedback signal of the photoelectric device of the distributed node, preceding forward signal and pre-set distortion mould
Type seeks photoelectricity model parameter；
The forward direction letter is corrected according to the feedback signal of the power amplifier, the power amplifier model parameter, the distortion model
Number obtain the forward signal after power amplifier correction；
The power amplifier correction is corrected according to the feedback signal of the photoelectric device, the photoelectricity model parameter, the distortion model
Forward signal afterwards.
4. method according to any one of claims 1 to 3, which is characterized in that the non-linear distortion rectifier is according to institute
Further include before stating the step of feedback signal corrects the forward signal：
The controller of base station by the feedback signal and the forward signal synchronize be input to non-linear distortion rectifier for institute
It states non-linear distortion rectifier and the forward signal is corrected according to the feedback signal.
5. according to the method described in claim 3, it is characterized in that, the step of seeking power amplifier model parameter includes：
According to the feedback signal of the model of the power amplifier and power divider power amplifier；
Power amplifier model parameter is sought according to feedback signal, preceding forward signal and the distortion model after division.
6. a kind of distributed base station system, which is characterized in that the system comprises：
Digital signal processing module, for sending forward signal to the distributed node of base station；
Distributed node, for the forward signal to be converted to radiofrequency signal, and will be after the correction of non-linear distortion rectifier
Forward signal is converted to radiofrequency signal and is sent to user terminal；
Ultramagnifier obtains feedback signal for sampling and handling the radiofrequency signal, and the feedback signal is sent to non-thread
Property distortion rectifier；
Non-linear distortion rectifier, before after being corrected to the forward signal according to the feedback signal
To signal and it is sent to distributed node.
7. system according to claim 6, which is characterized in that the non-linear distortion rectifier includes：
Power amplifier model parameter seeks module, for according to the feedback signal, preceding forward signal and pre-set mistake
True mode seeks power amplifier model parameter；
Power amplifier non-linear distortion rectification module, for according to the feedback signal, the power amplifier model parameter, the distortion model
Correct the forward signal.
8. system according to claim 6, which is characterized in that the non-linear distortion rectifier includes：
Power amplifier model parameter seeks module, for according to the feedback signal of the power amplifier of the distributed node, preceding
Forward signal and pre-set distortion model seek power amplifier model parameter；
Power amplifier non-linear distortion rectification module, for according to the feedback signal of the power amplifier, the power amplifier model parameter,
The distortion model corrects the forward signal；
Photoelectricity model parameter seeks module, is used for the feedback signal of the photoelectric device according to distributed node, preceding forward direction is believed
Number and pre-set distortion model seek photoelectricity model parameter；
Photoelectricity non-linear distortion rectification module, for the feedback signal, the photoelectricity model parameter, institute according to the photoelectric device
It states distortion model and corrects the forward signal after the power amplifier non-linear distortion rectification module correction.
9. according to claim 6 to 8 any one of them system, which is characterized in that the system also includes：
Controller, for by the feedback signal and the forward signal synchronize be input to non-linear distortion rectifier for described
Non-linear distortion rectifier corrects the forward signal according to the feedback signal.
10. system according to claim 8, which is characterized in that the power amplifier model parameter seeks module and is additionally operable to basis
The model of the power amplifier and the feedback signal of power divider power amplifier and according to after division feedback signal, preceding
Forward signal and the distortion model seek power amplifier model parameter.
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| CN1395438A (en) * | 1995-08-18 | 2003-02-05 | 富士通株式会社 | Amplifier with distortion compensator and radio communication base station |
| CN101984703A (en) * | 2010-11-04 | 2011-03-09 | 新邮通信设备有限公司 | Method and device for determining downlink power of radio remote unit (RRU) |
| US20120069880A1 (en) * | 2010-08-17 | 2012-03-22 | Dali Systems Co., Ltd. | Neutral Host Architecture For A Distributed Antenna System |
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|---|---|---|---|---|
| CN1395438A (en) * | 1995-08-18 | 2003-02-05 | 富士通株式会社 | Amplifier with distortion compensator and radio communication base station |
| US20120069880A1 (en) * | 2010-08-17 | 2012-03-22 | Dali Systems Co., Ltd. | Neutral Host Architecture For A Distributed Antenna System |
| CN101984703A (en) * | 2010-11-04 | 2011-03-09 | 新邮通信设备有限公司 | Method and device for determining downlink power of radio remote unit (RRU) |
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