CN107370697A - A kind of digital pre-distortion processing method and device - Google Patents
A kind of digital pre-distortion processing method and device Download PDFInfo
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- CN107370697A CN107370697A CN201610320239.6A CN201610320239A CN107370697A CN 107370697 A CN107370697 A CN 107370697A CN 201610320239 A CN201610320239 A CN 201610320239A CN 107370697 A CN107370697 A CN 107370697A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
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Abstract
The invention discloses a kind of digital pre-distortion processing method and device, to improve the stability of digital pre-distortion system, reduces the generation of unusual condition in DPD processing procedures.This method includes：Whether checking DPD system can normally perform DPD；When it is determined that the DPD system normally can perform DPD, DPD processes are performed.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of digital pre-distortion processing method and device.
Background technology
The fast development of radio communication so that frequency spectrum resource is very nervous, therefore the tune of Various Complex occurs
Mode processed improves frequency spectrum resource utilization rate, causes peak-to-average force ratio to uprise, influences signal quality.In communication system
In, in order to transmit information without distortions, the linearity of power amplifier (abbreviation power amplifier) is proposed very high
It is required that.Making up the nonlinear common method of power amplifier has two kinds at present：Power back and linearization technique.By
There is the deficiencies of power amplification efficiency is low, cost is high, equipment is complicated in Power back so that linearization technique
Advantage is more notable.Conventional linearization technique includes two kinds of feed-forward technique and pre-distortion technology, predistortion skill
Art has the characteristics that small volume, efficiency high, performance are good, is more used for the linearity for improving power amplifier, changes
Kind transmission signal quality, reduce adjacent-channel power interference.
Digital pre-distortion (Digital Pre-Distortion, DPD) technology is added before signal passes through power amplifier
One module reciprocal with power amplifier nonlinear characteristic, makes up the non-linear of power amplifier.DPD implementation method is profit
Rational power amplifier model is established with by the input signal before power amplifier and the feedback signal after power amplifier, is used in combination
The model obtains power amplifier inversion model, carries out pre-distortion to input signal so that the signal after predistortion leads to
It is linear to cross output signal and input signal after power amplifier.
Existing digital pre-distortion system framework has been mature on the whole, but in the application of reality, numeral is pre- to be lost
Each functions of modules of true system is realized by software.But often there are various problems and caused in realizing in software version
Some dysfunctions, such as DPD channel selectings, look-up table LUT is enabled, signal power is not excessive true
Determine problem, may all cause DPD effects undesirable, even result in DPD failures or burn power amplifier.
The content of the invention
The embodiments of the invention provide a kind of digital pre-distortion processing method and device, to improve digital pre- mistake
The stability of true system, reduces the generation of unusual condition in DPD processing procedures.
A kind of digital pre-distortion processing method provided in an embodiment of the present invention includes：
Whether checking digital pre-distortion DPD system can normally perform DPD；
When it is determined that the DPD system normally can perform DPD, DPD processes are performed.
This method provided in an embodiment of the present invention, before DPD processes are performed, first DPD system is carried out
Verification, when it is determined that DPD system normally can perform DPD, DPD processes are performed, improve DPD
The reliability and stability of system, avoid due to DPD failures caused by a variety of uncertain factors or burn
The problem of ruining power amplifier, the generation of unusual condition in DPD processing procedures can be effectively reduced using this method.
It is preferred that whether the checking DPD system can normally perform DPD, specifically include：
Checking performs the passage selected during DPD, wherein, the passage is that training sequence TR passes through DPD
The first passage of power amplifier is inputed to after processor processing, or is the TR without DPD processing
Device processing directly inputs the second channel to power amplifier；
If it is the first passage to perform the passage selected during DPD, it is determined that the DPD system can be just
Often perform DPD.
Because when performing DPD, TR can enter the selection of row of channels first, if the passage of selection is above-mentioned the
Two passages, equivalent to DPD processing is not carried out to input signal, DPD coefficients will not also update, finally
DPD processing failures can be caused.Therefore, the passage selected during execution DPD is verified by this method,
It is determined that TR selection passage be above-mentioned first passage when, just execution DPD, effectively prevent due to TR
DPD processing is abnormal caused by the mistake of channel selecting.
It is preferred that checking performs the passage selected during DPD, specifically include：
The numerical value in the look-up table LUT in the DPD processors is disposed as the first particular value in advance；
Extraction inputs to the training sequence TR ' of power amplifier, if the TR ' is equal to the TR, it is determined that
It is the second channel to perform the passage selected during DPD, otherwise, it determines performing the passage selected during DPD
For the first passage.
It is preferred that first particular value is 0.
If the first particular value is set into 0, if TR selections is first passage, DPD processors can be passed through
Handled, so as to be just 0 from the data after the processing of DPD processors output, that is, above-mentioned TR ' is
0, it is thus possible to by judge TR ' whether be 0 and it is simple, directly perceived, accurately determine and perform DPD choosings
Whether the passage selected is first passage.
It is preferred that when it is determined that the DPD system normally can perform DPD, DPD processes are performed,
Specifically include：
When it is determined that performing DPD the passage that selects for the first passage when, verify the DPD processors
In look-up table LUT it is enabled whether normal；
When it is determined that the LUT enables normal, DPD processes are performed.
So as to, when it is determined that performing DPD the passage that selects for the first passage when, further verify institute
Whether the look-up table LUT stated in DPD processors is enabled normal, and when it is determined that LUT enables normal,
DPD processes are performed, the DPD processing failures caused by LUT enables exception can be avoided.Also
It is to say, however, it is determined that LUT is enabled abnormal, then can stop performing follow-up DPD processes, it is unnecessary to reduce
Processing procedure, it is therefore prevented that the damage of power amplifier.
It is preferred that verify whether the LUT in the DPD processors is enabled normal, specifically includes：
The second particular value is preset for the LUT in the DPD processors；
LUT according to second particular value is preset with carries out simulation DPD to default specific training sequence
Calculation process, the data after being handled；
Judge whether data and default ideal data are consistent after the processing；It is if consistent, it is determined that described
LUT in DPD processors is enabled normal, otherwise, it determines the LUT in the DPD processors is enabled
It is abnormal.
It is preferred that when it is determined that the DPD system normally can perform DPD, DPD processes tool is performed
Body includes：
DPD calculation process is carried out to training sequence TR by the DPD processors in the DPD system,
Training sequence after being handled；
The training sequence after the processing is extracted, and the amplitude of the training sequence after the processing is examined
Survey；
If it is determined that the amplitude of the training sequence after the processing is in default amplitude range, then by the processing
Training sequence afterwards inputs to power amplifier, and otherwise, the amplitude of the training sequence after the processing is set
After meeting the range value of preset requirement, the power amplifier is inputed to.
Detected and handled by the amplitude of the training sequence to inputing to power amplifier, it is ensured that be defeated
Enter and meet preset requirement to the amplitude of the training sequence of power amplifier, caused by the generation for preventing big signal
Power amplifier burns, and avoids DPD processing failures.
It is preferred that this method also includes：
Extract the feedback data FB of power amplifier output, and according to the FB and the processing after
Training sequence update look-up table LUT in the DPD processors；
After the LUT in DPD processors updates, the numerical value in the LUT after renewal is verified,
If being determined according to the result, the numerical value in the LUT after the renewal meets preset requirement, according to
Numerical value in LUT after renewal performs DPD processes next time.
By being verified to the numerical value in LUT, the LUT's that ensures to use when performing digital pre-distortion
Numerical value is in effective scope, it is ensured that DPD effects, avoid because the numerical value in LUT is undesirable and
Caused DPD processing failures.
It is preferred that the LUT after the renewal includes an at least LUT；
The numerical value in the LUT after renewal is verified in the following way：
The numerical value of same position in each LUT after the renewal is summed, obtains m and value；
Wherein, m represents the number of the numerical value in each LUT；
By described each and value respectively compared with default number range, surpass if any described and value be present
Cross the default number range, it is determined that the numerical value in LUT after the renewal is unsatisfactory for preset requirement,
If described each and value is not above the default number range, it is determined that the LUT after the renewal
In numerical value meet preset requirement.
A kind of digital predistortion process apparatus provided in an embodiment of the present invention, including：
Authentication unit, for verifying whether digital pre-distortion DPD system can normally perform DPD；
Execution unit, for when it is determined that the DPD system normally can perform DPD, performing DPD
Process.
It is preferred that the authentication unit is specifically used for：
Checking performs the passage selected during DPD, wherein, the passage is that training sequence TR passes through DPD
The first passage of power amplifier is inputed to after processor processing, or is the TR without DPD processing
Device processing directly inputs the second channel to power amplifier；
If it is the first passage to perform the passage selected during DPD, it is determined that the DPD system can be just
Often perform DPD.
It is preferred that when the authentication unit checking performs the passage selected during DPD, it is specifically used for：
The numerical value in the look-up table LUT in the DPD processors is disposed as the first particular value in advance；
Extraction inputs to the training sequence TR ' of power amplifier, if the TR ' is equal to the TR, it is determined that
It is the second channel to perform the passage selected during DPD, otherwise, it determines performing the passage selected during DPD
For the first passage.
It is preferred that first particular value is 0.
It is preferred that the execution unit is specifically used for：
When it is determined that performing DPD the passage that selects for the first passage when, verify the DPD processors
In look-up table LUT it is enabled whether normal；
When it is determined that the LUT enables normal, DPD processes are performed.
It is preferred that the execution unit verify LUT in the DPD processors it is enabled whether it is normal when,
It is specifically used for：
The second particular value is preset for the LUT in the DPD processors；
LUT according to second particular value is preset with carries out simulation DPD to default specific training sequence
Calculation process, the data after being handled；
Judge whether data and default ideal data are consistent after the processing；It is if consistent, it is determined that described
LUT in DPD processors is enabled normal, otherwise, it determines the LUT in the DPD processors is enabled
It is abnormal.
It is preferred that the execution unit when it is determined that the DPD system normally can perform DPD, performs
During DPD processes, it is specifically used for：
DPD calculation process is carried out to training sequence TR by the DPD processors in the DPD system,
Training sequence after being handled；
The training sequence after the processing is extracted, and the amplitude of the training sequence after the processing is examined
Survey；
If it is determined that the amplitude of the training sequence after the processing is in default amplitude range, then by the processing
Training sequence afterwards inputs to power amplifier, and otherwise, the amplitude of the training sequence after the processing is set
After meeting the range value of preset requirement, the power amplifier is inputed to.
It is preferred that the execution unit is additionally operable to：
Extract the feedback data FB of power amplifier output, and according to the FB and the processing after
Training sequence update look-up table LUT in the DPD processors；
After the LUT in DPD processors updates, the numerical value in the LUT after renewal is verified,
If being determined according to the result, the numerical value in the LUT after the renewal meets preset requirement, according to
Numerical value in LUT after renewal performs DPD processes next time.
It is preferred that the LUT after the renewal includes an at least LUT；
The execution unit is verified to the numerical value in the LUT after renewal in the following way：
The numerical value of same position in each LUT after the renewal is summed, obtains n and value；
Wherein, n represents the number of the numerical value in each LUT；
By described each and value compared with default number range, if any described and value be present exceedes institute
State default number range, it is determined that the numerical value in LUT after the renewal is unsatisfactory for preset requirement, if
Described each and value is not above the default number range, it is determined that in the LUT after the renewal
Numerical value meet preset requirement.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of digital pre-distortion processing method provided in an embodiment of the present invention；
Fig. 2 is a kind of block diagram of digital pre-distortion block provided in an embodiment of the present invention；
Fig. 3 verifies principle schematic for a kind of TR passages provided in an embodiment of the present invention；
Fig. 4 is that a kind of TR provided in an embodiment of the present invention selects the time domain of training sequence during first passage to imitate
True oscillogram；
Fig. 5 is a kind of LUT provided in an embodiment of the present invention and value verification schematic diagram；
Fig. 6 is a kind of digital pre-distortion system configuration diagram provided in an embodiment of the present invention；
Fig. 7 is that a kind of amplitude to inputing to the training sequence of power amplifier provided in an embodiment of the present invention verifies
The simulation result schematic diagram of processing；
Fig. 8 is a kind of structural representation of digital predistortion process apparatus provided in an embodiment of the present invention.
Embodiment
The embodiments of the invention provide a kind of digital pre-distortion processing method and device, to improve digital pre- mistake
The stability of true system, reduces the generation of unusual condition in DPD processing procedures.
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with accompanying drawing and reality
Example is applied, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only
Only to explain the present invention, it is not intended to limit the present invention.
Referring to Fig. 1, a kind of digital pre-distortion processing method provided in an embodiment of the present invention, including：
Whether S101, checking DPD system can normally perform DPD；
S102, when it is determined that the DPD system normally can perform DPD, perform DPD processes.
It is preferred that step S101 is specifically included：
Checking performs the passage selected during DPD, wherein, the passage is that training sequence TR passes through DPD
The first passage of power amplifier is inputed to after processor processing, or is the TR without DPD processing
Device processing directly inputs the second channel to power amplifier；
If it is the first passage to perform the passage selected during DPD, it is determined that the DPD system can be normal
Perform DPD.
This is because, performing DPD flow is：The sequence training TR of transmission carries out channel selecting first, really
Surely it is to perform straight-through DPD or bypass DPD, wherein to refer to TR defeated after the processing of DPD processors by straight-through DPD
Enter to power amplifier, straight-through DPD corresponds to above-mentioned first passage, and bypass DPD refers to TR without DPD
Processor processing directly inputs corresponds to above-mentioned second channel to power amplifier, bypass DPD.During straight-through DPD
The renewal of DPD coefficients is carried out, when DPD coefficients do not update when bypassing DPD, if desired normally performs DPD mistakes
Journey, then above-mentioned first passage should be selected, if having selected above-mentioned second channel, DPD can be caused to perform mistake
Lose, therefore, the embodiment of the present invention first verifies that the passage for performing and being selected during DPD, when it is determined that the passage of selection
For first passage when, perform follow-up DPD flows, when it is determined that selection passage for second channel when, produce
Alarm, and stop follow-up process, it is abnormal to avoid the DPD caused by the mistake of channel selecting.
Fig. 2 show the block diagram of digital pre-distortion block provided in an embodiment of the present invention.Digital pre-distortion block
In field programmable gate array (Field Programmable Gate Array, FPGA), wherein showing
The LUT gone out is located in digital pre-distortion block, and FPGA is connected with power amplifier, and 1 square frame is labeled as in figure i.e.
For first passage, the square frame for being labeled as 2 is second channel.
TR is sent to power amplifier by first passage or second channel, when carrying out DPD coefficient updates, crawl
The feedback data FB of training sequence TR ' and power amplifier output after the processing of DPD processors train pre- mistake
True parameter (i.e. DPD coefficients), and DPD coefficient updates are saved in look-up table (Look Up Table, LUT)
In, so circulation is gone down.
It is preferred that checking performs the passage selected during DPD in the following way：
The numerical value in LUT in the DPD processors is disposed as the first particular value in advance；
Extraction inputs to the training sequence TR ' of power amplifier, if the TR ' is equal to the TR, it is determined that
It is the second channel to perform the passage selected during DPD, otherwise, it determines performing the passage selected during DPD
For the first passage.
It is preferred that first particular value is 0.
Fig. 3 show TR passages verification principle schematic, when TR selects first passage, by DPD
True processor, and the LUT in DPD processors carries out DPD calculation process to TR, due to LUT
In numerical value be preset as the first particular value 0, thus, it can be understood that TR is multiplied by into coefficient 0, now, warp
The value for crossing after DPD processors the TR ' exported is 0；When TR selects second channel, it can be understood as will
TR is multiplied by coefficient 1, therefore TR ' value is equal to TR value.By capturing TR ', it is possible to judge that TR is selected
Whether the passage selected is first passage.
Fig. 4 show TR selection first passage when training sequence time-domain-simulation oscillogram.Can from figure
Intuitively to find out, TR ' is 0, hence, it can be determined that the passage of TR selections is first passage.
As a kind of preferable embodiment, the first particular value is set to 0, it is of course also possible to special by first
Definite value is set to other numerical value, such as is set to 100 grade numerical value, and the embodiment of the present invention is not construed as limiting to this.
It is preferred that when it is determined that the DPD system normally can perform DPD, DPD processes are performed,
Specifically include：
When it is determined that performing DPD the passage that selects for the first passage when, verify the DPD processors
In LUT it is enabled whether normal；
When it is determined that the LUT enables normal, DPD processes are performed.
Certainly, however, it is determined that LUT is enabled abnormal, can produce alarm, to indicate that LUT is enabled abnormal, stops
Only follow-up DPD flows, ensuring the enabled normal rear execution DPD processes of LUT.
Here, LUT is enabled abnormal, such as can be LUT address acquisition mistakes, or in LUT
Situations such as numerical exception.
It is preferred that verify whether the LUT in the DPD processors is enabled normal, specifically includes：
The second particular value is preset for the LUT in the DPD processors；
LUT according to second particular value is preset with carries out simulation DPD to default specific training sequence
Calculation process, the data after being handled；
Judge whether data and default ideal data are consistent after the processing；It is if consistent, it is determined that described
LUT in DPD processors is enabled normal, otherwise, it determines the LUT in the DPD processors is enabled
It is abnormal.
It is preferred that tell that default training sequence includes 1 and 0 Serial No. being alternately arranged.
It is preferred that in the case of default ideal data enables normally for the LUT in DPD processors,
LUT according to the particular value is preset with carries out simulating DPD calculation process to default specific training sequence
The data obtained afterwards.
The expression formula of digital pre-distortion model is as follows：
Wherein, x represents input signal, and y represents output signal, and m represents memory depth, and l represents cross term depth,
Lut represents the numerical value in LUT.
From formula (1) as can be seen that the output valve y after DPD calculation process is defeated with this by input signal
Enter what the product accumulation of the numerical value in LUT corresponding to signal obtained, therefore by default specific training sequence
As input signal, according to being preset with the LUT of particular value to default specific training sequence according to formula (1)
Carry out simulating DPD calculation process, the data after being handled, the data after processing can also be referred to as working as
Preceding output valve.Specifically, current output valve is：Current input value is multiplied by memory depth as 0 respectively
Input when corresponding each LUT particular value, and each product value is summed along with memory depth is m
Product value of the value with memory depth for the corresponding each LUT of m particular value, wherein m ∈ { 1,2,3 ... }.
A specific example is given below to illustrate.
Table 1 is shown under a kind of configuration of DPD models, the assignment feelings in LUT arrangement mode and LUT
Condition, wherein memory depth are 7, and cross term depth is 1, and the first row represents cross term depth in table 1, uses L
Represent, first row represents memory depth, is represented with M, remaining numerical value represents in each LUT respectively
Numerical value, that is, the present embodiment is each default particular value of LUT.Wherein, in same LUT
Numerical value be identical particular value, memory depth is in each LUT corresponding to each memory depth of even number
Numerical value be different particular values, memory depth is in each LUT corresponding to each memory depth of odd number
Numerical value is different particular values.
Table 1
Wherein, the 10101010 of the left side of table 1 ..., represent default training sequence, each numerical value (such as 0
Or 1) input value under different memory depths is corresponded to respectively, in table 1, current input value is 1 (i.e.
Input value when memory depth is 0).
It is enabled normal with the case of two kinds of exception that LUT is given at separately below, and training sequence TR passes through DPD
Output valve y after calculation process, it is understood that to be to capture the TR ' of returning：
1) under normal condition：
During current input x=1, y=1+2+4+8+16+32+64+128=255；
During current input x=0, y=1+2+4+8+16+32+64=127；
Now：TR ' is by 255 and 127 sequences alternately formed.Due to 255 and 127 and default ideal
Data are identical, are that can determine that the LUT in DPD processors is enabled normal by the output valve therefore.
2) under abnormality：Assuming that corresponding LUT is not enabled on when memory depth is 2；
During current input x=1, y=1+2+16+32+64+128=243；
During current input x=0, y=1+2+4+8+16+32+64=127；
Now：TR ' is by 243 and 127 sequences alternately formed.
By comparing it was determined that corresponding output valve 243 and default ideal data when current input is 1
255 is inconsistent, hence, it can be determined that the LUT in DPD processors is enabled normal.Specifically, can be with
Determine whether which LUT is enabled abnormal by the difference of output valve and default ideal data：Due to
The difference of output valve 248 and default ideal data is by default each particular value in table 1 for 12,12
4 are added what is obtained with 8, hence, it can be determined that the enabled exceptions of LUT that particular value is 4 and 8 are preset with,
I.e. memory depth is that two LUT are enabled abnormal corresponding to 2.
It is preferred that when it is determined that the DPD system normally can perform DPD, DPD processes are performed,
Specifically include：
DPD calculation process is carried out to training sequence TR by the DPD processors in the DPD system,
Training sequence after being handled；
The training sequence after the processing is extracted, and the amplitude of the training sequence after the processing is examined
Survey；
If it is determined that the amplitude of the training sequence after the processing is in default amplitude range, then by the processing
Training sequence afterwards inputs to power amplifier, and otherwise, the amplitude of the training sequence after the processing is set
After meeting the range value of preset requirement, the power amplifier is inputed to.
Typically, since LUT continuous renewal, when training sequence is often handled by DPD processors,
Calculation process will be carried out according to the numerical value in LUT, therefore, the amplitude of the training sequence after processing is not
Disconnected change, if its amplitude is too high, caused big signal will damage power amplifier.Therefore the present invention is implemented
Example by the training sequence after the processing of DPD processors before power amplifier is inputed to, first to the instruction after the processing
The amplitude for practicing sequence is detected, and the amplitude of training sequence after it is determined that handling is in default amplitude range
When, the training sequence after the processing of DPD processors is just inputed into power amplifier, otherwise, at DPD
The amplitude of training sequence after reason device processing is arranged to after meeting the range value of preset requirement, inputs to the work(
Rate amplifier.Wherein, default amplitude range TR (n) is shown below：
Adown＜ TR (n) ＜ Aup (2)
In above formula, AdownRepresent lower magnitude limits, AupRepresent the amplitude upper limit.
It should be noted that the amplitude of the above-mentioned training sequence to after the processing of DPD processors is examined
The process of survey can be the LUT that DPD processors normally enable according to this after it is determined that LUT is enabled normal
In numerical value DPD calculation process is carried out to training sequence after, the amplitude of the training sequence after processing is carried out
Detection；Can also be it is determined that perform DPD when TR selection passage for above-mentioned first passage when, without
Verification enabled LUT, TR is directly inputed into DPD processors and carries out DPD calculation process, it is right afterwards
The amplitude of training sequence after the processing of DPD processors output is detected, and the embodiment of the present invention is not made specifically
Limit.
It is preferred that after the training sequence after the processing of DPD processors is inputed into power amplifier,
This method also includes：
The feedback data FB of the power amplifier output is extracted, and according to the FB and by DPD
Training sequence after processor processing updates the look-up table LUT in the DPD processors；
After the LUT in DPD processors updates, the numerical value in the LUT after renewal is verified,
If being determined according to the result, the numerical value in the LUT after the renewal meets preset requirement, according to
Numerical value in LUT after renewal performs DPD processes next time.
It is preferred that the LUT after the renewal includes an at least LUT；LUT after wherein described renewal
Including LUT number be to be together decided on by the memory depth and cross term depth of DPD models.
The numerical value in the LUT after renewal is verified in the following way：
The numerical value of same position in each LUT after the renewal is summed, obtains n and value；
Wherein, n represents the number of the numerical value in each LUT；
By described each and value compared with default number range, if any described and value be present exceedes institute
State default number range, it is determined that the numerical value in LUT after the renewal is unsatisfactory for preset requirement, if
Described each and value is not above the default number range, it is determined that in the LUT after the renewal
Numerical value meet preset requirement.
Fig. 5 show LUT and value verification schematic diagram.
In Figure 5, each arrange represents a LUT, the numerical value in common n LUT, each LUT
Number m is 512, and 0~511 in each of which row does not mean that 512 numerical value in each LUT,
But the 0th numerical value is represented respectively, and the 1st numerical value ..., the 511st numerical value.By each LUT
The numerical value of middle same position is summed, that is, as shown in figure 5, by the 0th in the 0th LUT
Numerical value respectively with the 0th numerical value in the 1st LUT, the 0th numerical value in the 2nd LUT ...,
The 0th numerical value in n-th LUT is added, and obtain and value is the 0th and value；By the 0th LUT
In the 1st numerical value respectively with the 1st in the 1st numerical value in the 1st LUT, the 2nd LUT
Numerical value ..., the 1st numerical value in n-th LUT be added, obtain and value as the 1st and value；…；
By the 511st numerical value in the 0th LUT respectively with the 511st numerical value, the 2nd in the 1st LUT
The 511st numerical value in LUT ..., the 511st numerical value in n-th LUT be added, obtain
It is the 511st and value with value.
By described each and value respectively compared with default number range, that is, by above-mentioned 512 and
Value is respectively compared with same default number range, when setting the threshold range, such as can root
Set according to ± the 3dB under full web state.Wherein, default number range sum (n) is shown below：
Down_Gata ＜ sum (n) ＜ Up_Gata (3)
In above formula, Down_Gata represents default and value lower limit, and Up_Gata represents default and value the upper limit.
By being verified to LUT's with value, the validity of the numerical value in LUT ensure that, it is therefore prevented that big
The generation of signal and burn power amplifier, improve product quality.
The technical scheme provided below from overall angle present example is illustrated.
Fig. 6 show a kind of digital pre-distortion system configuration diagram provided in an embodiment of the present invention.
Wherein, forward emitted link includes Digital Up Convert (DUC) and peak factor suppresses (CFR) mould
Block, predistortion processor module, DPD correction verification modules, digital-to-analogue conversion (DAC) module, radio frequency (RF)
Transmission channel and power amplifier, reverse receives link include RF receiving channels, analog-to-digital conversion (ADC)
Module and DPD model computation modules, DPD model computation modules mainly according to the training sequence of capture and connect
The feedback data of the power amplifier of receiving end capture, calculates pre-distortion parameters.
As a kind of implementation, above-mentioned DPD correction verification modules can include TR passages checker, LUT
Enabled checker, power arbiter, LUT and value detector four part.Four part can be co-located on
In one EM equipment module, individually it can also be configured or be combined and be configured, the present invention
Embodiment is not construed as limiting to this.Performing the detailed process of digital pre-distortion processing can include：
In original execution DPD, input signal is after DUC and CRF modules, at predistortion
Device module is managed, now, TR can enter the selection of row of channels, and the embodiment of the present invention is tested by TR passage checkers
Whether the passage of TR selections can be found in discussed above for first passage, specific verification process when card performs DPD；
When it is determined that the passage of TR selections is first passage, enabled by LUT at the checker checking predistortion
Whether the LUT managed in device is enabled normal, and specific verification process can be found in discussed above；When it is determined that LUT makes
When can be normal, the training sequence of power amplifier will be inputed to by the crawl of power arbiter, and to the training sequence
Amplitude detected, the amplitude of training sequence for ensureing to input to power amplifier meets default amplitude range；
The feedback data and input to the training sequence before power amplifier that DPD model computation modules crawl power amplifier exports, are counted
Pre-distortion parameters (i.e. DPD coefficients) are calculated, and by the DPD coefficient updates being calculated into LUT；It
LUT and value detector verify that specific verification process can be found in the numerical value in the LUT after renewal afterwards
Discussed above, after the numerical value in LUT after it is determined that updating meets preset requirement, DPD system uses should
Numerical value in LUT after renewal performs DPD processes, and so circulation is gone down.
That is, after having performed a DPD process every time, the numerical value in LUT can be correspondingly updated,
Now, LUT and value detector can be verified to the numerical value in LUT, that is, judge same in each LUT
Whether the numerical value of one position obtains after being added and value is in default number range, when it is determined that in LUT
After numerical value meets preset requirement, it is determined that DPD next time can be performed according to the LUT, performing next time
Before DPD, first pass through TR passages arbiter and verify whether the passage of TR selections is correct, when it is determined that TR
When the passage of selection is correct, determine that DPD system can normally perform DPD, being further advanced by LUT makes
Can checker checking LUT it is enabled whether it is normal (such as LUT address choices whether the number in correct, LUT
Whether value is abnormal etc.), after it is determined that LUT is enabled normal, call the LUT to enter the training sequence of input
Row DPD calculation process, the training sequence after output processing, wherein the numerical value in the LUT called is newest
Numerical value that is after renewal and meeting preset requirement, before the training sequence after by processing inputs to power amplifier, lead to
Overpower arbiter verifies whether the amplitude of the training sequence meets preset requirement, finally ensures to input to power amplifier
Training sequence be the training sequence for meeting default amplitude requirement, to avoid big signal from burning power amplifier.
Referring to Fig. 7, the embodiments of the invention provide a kind of amplitude progress to inputing to the training sequence of power amplifier
The simulation result schematic diagram of checking treatment.Wherein, horizontal dotted line represents default upper amplitude limit, can see
Go out signal amplitude more than the upper amplitude limit, by assignment again, ensure that signal amplitude meets default amplitude
It is required that prevent the generation of big signal.
The embodiment of the present invention additionally provides a kind of digital predistortion process apparatus, as shown in figure 8, the device bag
Include：
Authentication unit 11, for verifying whether digital pre-distortion DPD system can normally perform DPD；
Execution unit 12, for when it is determined that the DPD system normally can perform DPD, performing DPD
Process.
It is preferred that the authentication unit 11 is specifically used for：
Checking performs the passage selected during DPD, wherein, the passage is that training sequence TR passes through DPD
The first passage of power amplifier is inputed to after processor processing, or is the TR without DPD processing
Device processing directly inputs the second channel to power amplifier；
If it is the first passage to perform the passage selected during DPD, it is determined that the DPD system can be just
Often perform DPD.
It is preferred that when the checking of authentication unit 11 performs the passage selected during DPD, it is specifically used for：
The numerical value in the look-up table LUT in the DPD processors is disposed as the first particular value in advance；
Extraction inputs to the training sequence TR ' of power amplifier, if the TR ' is equal to the TR, it is determined that
It is the second channel to perform the passage selected during DPD, otherwise, it determines performing the passage selected during DPD
For the first passage.
It is preferred that first particular value is 0.
It is preferred that the execution unit 12 is specifically used for：
When it is determined that performing DPD the passage that selects for the first passage when, verify the DPD processors
In look-up table LUT it is enabled whether normal；
When it is determined that the LUT enables normal, DPD processes are performed.
It is preferred that the execution unit 12 verifies whether the LUT in the DPD processors is enabled normal
When, it is specifically used for：
The second particular value is preset for the LUT in the DPD processors；
LUT according to second particular value is preset with carries out simulation DPD to default specific training sequence
Calculation process, the data after being handled；
Judge whether data and default ideal data are consistent after the processing；It is if consistent, it is determined that described
LUT in DPD processors is enabled normal, otherwise, it determines the LUT in the DPD processors is enabled
It is abnormal.
It is preferred that the execution unit 12 be when it is determined that the DPD system normally can perform DPD,
When performing DPD processes, it is specifically used for：
DPD calculation process is carried out to training sequence TR by the DPD processors in the DPD system,
Training sequence after being handled；
The training sequence after the processing is extracted, and the amplitude of the training sequence after the processing is examined
Survey；
If it is determined that the amplitude of the training sequence after the processing is in default amplitude range, then by the processing
Training sequence afterwards inputs to power amplifier, and otherwise, the amplitude of the training sequence after the processing is set
After meeting the range value of preset requirement, the power amplifier is inputed to.
It is preferred that the execution unit 12 is additionally operable to：
Extract the feedback data FB of power amplifier output, and according to the FB and the processing after
Training sequence update look-up table LUT in the DPD processors；
After the LUT in DPD processors updates, the numerical value in the LUT after renewal is verified,
If being determined according to the result, the numerical value in the LUT after the renewal meets preset requirement, according to
Numerical value in LUT after renewal performs DPD processes next time.
It is preferred that the LUT after the renewal includes an at least LUT；
The execution unit is verified to the numerical value in the LUT after renewal in the following way：
The numerical value of same position in each LUT after the renewal is summed, obtains n and value；
Wherein, n represents the number of the numerical value in each LUT；
By described each and value compared with default number range, if any described and value be present exceedes institute
State default number range, it is determined that the numerical value in LUT after the renewal is unsatisfactory for preset requirement, if
Described each and value is not above the default number range, it is determined that in the LUT after the renewal
Numerical value meet preset requirement.
In the embodiment of the present invention, above-mentioned each function list can be realized by entity devices such as specific hardware processors
Member.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or meter
Calculation machine program product.Therefore, the present invention can use complete hardware embodiment, complete software embodiment or knot
The form of embodiment in terms of conjunction software and hardware.Wherein wrapped in one or more moreover, the present invention can use
Containing computer usable program code computer-usable storage medium (include but is not limited to magnetic disk storage and
Optical memory etc.) on the form of computer program product implemented.
The present invention is produced with reference to method according to embodiments of the present invention, equipment (system) and computer program
The flow chart and/or block diagram of product describes.It should be understood that can by computer program instructions implementation process figure and
/ or each flow in block diagram and/or square frame and flow in flow chart and/or block diagram and/
Or the combination of square frame.These computer program instructions can be provided to all-purpose computer, special-purpose computer, insertion
Formula processor or the processor of other programmable data processing devices are to produce a machine so that pass through calculating
The instruction of the computing device of machine or other programmable data processing devices is produced for realizing in flow chart one
The device for the function of being specified in individual flow or multiple flows and/or one square frame of block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable datas to handle and set
In the standby computer-readable memory to work in a specific way so that be stored in the computer-readable memory
Instruction produce and include the manufacture of command device, command device realization is in one flow or multiple of flow chart
The function of being specified in one square frame of flow and/or block diagram or multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices, made
Obtain and series of operation steps is performed on computer or other programmable devices to produce computer implemented place
Reason, so as to which the instruction that is performed on computer or other programmable devices is provided for realizing in flow chart one
The step of function of being specified in flow or multiple flows and/or one square frame of block diagram or multiple square frames.
Obviously, those skilled in the art can carry out various changes and modification without departing from this hair to the present invention
Bright spirit and scope.So, if the present invention these modifications and variations belong to the claims in the present invention and
Within the scope of its equivalent technologies, then the present invention is also intended to comprising including these changes and modification.
Claims (18)
1. a kind of digital pre-distortion processing method, it is characterised in that this method includes：
Whether checking digital pre-distortion DPD system can normally perform DPD；
When it is determined that the DPD system normally can perform DPD, DPD processes are performed.
2. according to the method for claim 1, it is characterised in that whether the checking DPD system may be used
Normally to perform DPD, specifically include：
Checking performs the passage selected during DPD, wherein, the passage is that training sequence TR passes through DPD
The first passage of power amplifier is inputed to after processor processing, or is the TR without DPD processing
Device processing directly inputs the second channel to power amplifier；
If it is the first passage to perform the passage selected during DPD, it is determined that the DPD system can be just
Often perform DPD.
3. according to the method for claim 2, it is characterised in that selected during checking execution DPD logical
Road, specifically include：
The numerical value in the look-up table LUT in the DPD processors is disposed as the first particular value in advance；
Extraction inputs to the training sequence TR ' of power amplifier, if the TR ' is equal to the TR, it is determined that
It is the second channel to perform the passage selected during DPD, otherwise, it determines performing the passage selected during DPD
For the first passage.
4. according to the method for claim 3, it is characterised in that first particular value is 0.
5. according to the method for claim 2, it is characterised in that when it is determined that the DPD system can be with
During normal execution DPD, DPD processes are performed, are specifically included：
When it is determined that performing DPD the passage that selects for the first passage when, verify the DPD processors
In look-up table LUT it is enabled whether normal；
When it is determined that the LUT enables normal, DPD processes are performed.
6. according to the method for claim 5, it is characterised in that verify in the DPD processors
Whether LUT is enabled normal, specifically includes：
The second particular value is preset for the LUT in the DPD processors；
LUT according to second particular value is preset with carries out simulation DPD to default specific training sequence
Calculation process, the data after being handled；
Judge whether the data after the processing and default ideal data are consistent；It is if consistent, it is determined that described
LUT in DPD processors is enabled normal, otherwise, it determines the LUT in the DPD processors is enabled
It is abnormal.
7. according to the method for claim 1, it is characterised in that the execution DPD processes are specifically wrapped
Include：
DPD calculation process is carried out to training sequence TR by the DPD processors in the DPD system,
Training sequence after being handled；
The training sequence after the processing is extracted, and the amplitude of the training sequence after the processing is examined
Survey；
If it is determined that the amplitude of the training sequence after the processing is in default amplitude range, then by the processing
Training sequence afterwards inputs to power amplifier, and otherwise, the amplitude of the training sequence after the processing is set
After meeting the range value of preset requirement, the power amplifier is inputed to.
8. according to the method for claim 7, it is characterised in that this method also includes：
Extract the feedback data FB of power amplifier output, and according to the FB and the processing after
Training sequence update look-up table LUT in the DPD processors；
After the LUT in DPD processors updates, the numerical value in the LUT after renewal is verified,
If being determined according to the result, the numerical value in the LUT after the renewal meets preset requirement, according to
Numerical value in LUT after renewal performs DPD processes next time.
9. according to the method for claim 8, it is characterised in that the LUT after the renewal is included extremely
A few LUT；
The numerical value in the LUT after renewal is verified in the following way：
The numerical value of same position in each LUT after the renewal is summed, obtains m and value；
Wherein, m represents the number of the numerical value in each LUT；
By described each and value respectively compared with default number range, surpass if any described and value be present
Cross the default number range, it is determined that the numerical value in LUT after the renewal is unsatisfactory for preset requirement,
If described each and value is not above the default number range, it is determined that the LUT after the renewal
In numerical value meet preset requirement.
10. a kind of digital predistortion process apparatus, it is characterised in that the device includes：
Authentication unit, for verifying whether digital pre-distortion DPD system can normally perform DPD；
Execution unit, for when it is determined that the DPD system normally can perform DPD, performing DPD
Process.
11. device according to claim 10, it is characterised in that the authentication unit is specifically used for：
Checking performs the passage selected during DPD, wherein, the passage is that training sequence TR passes through DPD
The first passage of power amplifier is inputed to after processor processing, or is the TR without DPD processing
Device processing directly inputs the second channel to power amplifier；
If it is the first passage to perform the passage selected during DPD, it is determined that the DPD system can be just
Often perform DPD.
12. device according to claim 11, it is characterised in that the authentication unit checking performs
During the passage selected during DPD, it is specifically used for：
The numerical value in the look-up table LUT in the DPD processors is disposed as the first particular value in advance；
Extraction inputs to the training sequence TR ' of power amplifier, if the TR ' is equal to the TR, it is determined that
It is the second channel to perform the passage selected during DPD, otherwise, it determines performing the passage selected during DPD
For the first passage.
13. device according to claim 12, it is characterised in that first particular value is 0.
14. device according to claim 11, it is characterised in that the execution unit is specifically used for：
When it is determined that performing DPD the passage that selects for the first passage when, verify the DPD processors
In look-up table LUT it is enabled whether normal；
When it is determined that the LUT enables normal, DPD processes are performed.
15. device according to claim 14, it is characterised in that described in the execution unit checking
LUT in DPD processors it is enabled whether it is normal when, be specifically used for：
The second particular value is preset for the LUT in the DPD processors；
LUT according to second particular value is preset with carries out simulation DPD to default specific training sequence
Calculation process, the data after being handled；
Judge whether data and default ideal data are consistent after the processing；It is if consistent, it is determined that described
LUT in DPD processors is enabled normal, otherwise, it determines the LUT in the DPD processors is enabled
It is abnormal.
16. device according to claim 10, it is characterised in that the execution unit performs DPD
During process, it is specifically used for：
DPD calculation process is carried out to training sequence TR by the DPD processors in the DPD system,
Training sequence after being handled；
The training sequence after the processing is extracted, and the amplitude of the training sequence after the processing is examined
Survey；
If it is determined that the amplitude of the training sequence after the processing is in default amplitude range, then by the processing
Training sequence afterwards inputs to power amplifier, and otherwise, the amplitude of the training sequence after the processing is set
After meeting the range value of preset requirement, the power amplifier is inputed to.
17. device according to claim 16, it is characterised in that the execution unit is additionally operable to：
Extract the feedback data FB of power amplifier output, and according to the FB and the processing after
Training sequence update look-up table LUT in the DPD processors；
After the LUT in DPD processors updates, the numerical value in the LUT after renewal is verified,
If being determined according to the result, the numerical value in the LUT after the renewal meets preset requirement, according to
Numerical value in LUT after renewal performs DPD processes next time.
18. device according to claim 17, it is characterised in that the LUT after the renewal includes
An at least LUT；
The execution unit is verified to the numerical value in the LUT after renewal in the following way：
The numerical value of same position in each LUT after the renewal is summed, obtains n and value；
Wherein, n represents the number of the numerical value in each LUT；
By described each and value compared with default number range, if any described and value be present exceedes institute
State default number range, it is determined that the numerical value in LUT after the renewal is unsatisfactory for preset requirement, if
Described each and value is not above the default number range, it is determined that in the LUT after the renewal
Numerical value meet preset requirement.
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