CN107302471A - A kind of DPD performs method, apparatus and system - Google Patents
A kind of DPD performs method, apparatus and system Download PDFInfo
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- CN107302471A CN107302471A CN201610232611.8A CN201610232611A CN107302471A CN 107302471 A CN107302471 A CN 107302471A CN 201610232611 A CN201610232611 A CN 201610232611A CN 107302471 A CN107302471 A CN 107302471A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/16—Threshold monitoring
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0631—Management of faults, events, alarms or notifications using root cause analysis; using analysis of correlation between notifications, alarms or events based on decision criteria, e.g. hierarchy, tree or time analysis
Abstract
Method, apparatus and system are performed the invention discloses a kind of DPD, the signal power real-time matching of LUT and UE to cause DPD training generations, it is to avoid power amplifier exception in RRU is burnt.This method includes：DPD each passage is performed the need for for presetting, DPD processes are performed for the passage；The training sequence TR that signal power current with UE in the passage matches is gathered, is judged whether to perform DPD processes for the passage again according to the TR.Wherein, the process for performing DPD is as follows：The TR that signal power current with UE in the passage matches is gathered, the collection feedback sequence FB corresponding with the TR after TR is obtained；According to the TR and the FB, DPD coefficients are calculated, and obtained DPD coefficient updates will be calculated into look-up table LUT corresponding with the passage.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of digital pre-distortion (Digital
Pre-Distortion, DPD) perform method, apparatus and system.
Background technology
DPD schemes in existing FDD (Frequency Division Duplex, FDD) system,
DPD trigger condition is to continue to use the triggering in time division duplex (Time Division Duplex, TDD) system
The trigger condition of scheme, i.e. DPD triggers for driving, wherein, driving triggering can be divided into again sets up cell
Triggering, temperature change triggering, DPD failures such as trigger at the mode again.
According to prior art, a DPD process is being finished, corresponding user's look-up table (Look Up are configured
Table, LUT) after, if not up to above-mentioned driving trigger condition would not trigger DPD flows again.
However, in FDD system, because the power of service signal is real-time change, therefore being possible to out
Now use the training sequence (TR) under low-power to be DPD and configure after generation LUT, one is received suddenly
Powerful signal, because powerful signal can not be matched with LUT, it is thus possible to cause to burn power amplifier.
In summary, can not be with user equipment using the existing DPD LUT for performing method training generation
The signal power real-time matching of (User Equipment, UE), is easily caused Remote Radio Unit (Remote
Radio Unit, RRU) in power amplifier operation irregularity or burn.
The content of the invention
Method, apparatus and system are performed the embodiments of the invention provide a kind of DPD, to cause DPD to instruct
Practice the LUT and UE of generation signal power real-time matching, it is to avoid power amplifier operation irregularity in RRU or
Burn.
A kind of DPD provided in an embodiment of the present invention, which performs method, to be included：
DPD each passage is performed the need for for presetting, DPD processes are performed for the passage；
Gather the training sequence TR that signal power current with user equipment (UE) in the passage matches, root
Judge whether to perform DPD processes for the passage again according to the TR.
In this method of the embodiment of the present invention, matched by signal power current with UE in acquisition channel
Training sequence TR, according to the TR judge whether again for the passage perform DPD processes, so as to
To perform real-time DPD processes according to the signal power variations of UE in passage, it is ensured that DPD training generations
LUT can be with UE signal power real-time matching, improve adjacent channel power ratio (Adjacent
Chirp-to-Power Ratio, ACPR), it is to avoid UE signal power is directly entered in RRU after raising
Power amplifier the problem of cause power amplifier operation irregularity or burn.
It is preferred that performing DPD processes for the passage, specifically include：
The TR that signal power current with UE in the passage matches is gathered, when the TR meets preparatory condition
When, DPD coefficients are determined according to the TR.
Due to directly gathering the TR that signal power current with UE in the passage matches, so that according to this
The LUT that TR performs at DPD training more conforms to actual conditions, and need not be to Digital Signal Processing
Device (Digital Signal Processor, DSP) applies for training sequence, simplifies DPD and performs flow, greatly
The big time for shortening DPD execution.
It is preferred that when the TR meets preparatory condition, determining DPD coefficients according to the TR, specifically including：
Judge whether the power of the TR is more than default power threshold, when it is determined that the power of the TR is more than
During default power threshold, DPD coefficients are determined according to the TR.
By setting power threshold, it is ensured that the TR of collection power is more than the default power threshold
During value so that the corresponding feedback sequence FB of the TR of collection power will not be too low, according to the TR and
FB can reach more preferably effect when calculating DPD coefficients.
It is preferred that when it is determined that the power of the TR is less than default power threshold, start timer, when
After the timer expiry, DPD processes are re-executed.
So as to by determining that TR power is less than default power threshold, it is possible to determine that DPD is performed
Failure, the follow-up DPD processes without performing again improve the efficiency of whole DPD implementation procedures.
It is preferred that the training sequence TR that signal power current with UE in the passage matches is gathered, root
Judge whether to perform DPD processes for the passage again according to the TR, specifically include：
The TR that signal power current with UE in the passage matches periodically is gathered, and counts the TR
The first performance number；
By first performance number, with it is last perform DPD processes for the passage when use the of TR
Two performance numbers are compared；Judged whether to perform DPD processes for the passage again according to comparative result.
By the process, DPD triggering mode is added, that is, passes through real-time statistics and the letters of UE currently
The TR that number power matches judges whether to perform DPD processes to the passage again, thereby may be ensured that
The LUT of DPD training generations can with UE signal power real-time matching, it is to avoid UE signal work(
The problem of power amplifier that rate is directly entered after raising in RRU causes power amplifier operation irregularity or burnt.
It is preferred that being judged whether to perform DPD processes, specific bag for the passage again according to comparative result
Include：
When first performance number is more than second performance number, and first performance number and described second
When the difference of performance number is more than preset value, it is determined that performing DPD processes for the passage again.
It is from passing through successively it is preferred that the TR that signal power current with UE in the described passage matches
Gathered in the signal data for crossing the UE after average power protection module, the processing of peak power protection module.
It is thus possible to improve the degree of accuracy for calculating DPD coefficients.
It is preferred that performing DPD processes for the passage, specifically include：
The interrupt signal to indicate successful acquisition TR is exported, and gathers feedback sequence corresponding with the TR
FB；
According to the TR and the FB, DPD coefficients are calculated；
When it is determined that the DPD coefficients meet preset requirement, by the DPD coefficient updates to the passage
In corresponding look-up table LUT.
It is preferred that above-mentioned LUT is the LUT after being extended in the following way to memory space：
LUT address value is compressed according to default suppressed range value.
So as to reduce LUT stepping, the data of more Large Copacity can be preserved using the LUT, improve
DPD accuracy, lifting power amplifier it is linear.
It is preferred that this method also includes：
Calculation process is carried out to the data of UE in the passage according to the LUT after renewal, then, judgement processing
Whether the Magnitude Difference of the amplitude of data afterwards and the data of before processing exceedes default threshold range, when described
When difference exceedes the default threshold range, report and alarm, and perform DPD mistakes for the passage again
Journey.
It is preferred that according to the TR and the FB, when calculating DPD coefficients, using iterative algorithm, and according to
The calculating parameter that signal bandwidth selection is used.
It is preferred that the calculating parameter for selecting to use according to signal bandwidth, is specifically included：
When signal bandwidth is less than or equal to 20MHz, the calculating parameter that selection is used includes：Non-linear rank
Number is that 7, memory depth is that 5, time delay is that -1, cross term is 0；
When signal bandwidth is more than 20MHz, the calculating parameter that selection is used includes：Non-linear exponent number be 7,
Memory depth is that 5, time delay is that -1, cross term is 1.
So as to according to signal bandwidth, select different calculating parameters, improve the standard for calculating DPD coefficients
Exactness.
The embodiments of the invention provide a kind of DPD performs devices, the device includes：
Execution unit, for each passage for performing DPD the need for default, is performed for the passage
DPD processes；
Judging unit, for gathering the instruction that signal power current with user equipment (UE) in the passage matches
Practice sequence TR, judged whether to perform DPD processes for the passage again according to the TR.
It is preferred that the execution unit specifically for：
The TR that signal power current with UE in the passage matches is gathered, when the TR meets preparatory condition
When, DPD coefficients are determined according to the TR.
It is preferred that the execution unit determines DPD coefficients when TR meets preparatory condition according to the TR
When, specifically for：
Judge whether the power of the TR is more than default power threshold, when it is determined that the power of the TR is more than
During default power threshold, DPD coefficients are determined according to the TR.
It is preferred that the execution unit is additionally operable to：When it is determined that the power of the TR is less than default power threshold
During value, start timer, after the timer expiry, re-execute DPD processes.
It is preferred that the judging unit specifically for：
The TR that signal power current with UE in the passage matches periodically is gathered, and counts the TR
The first performance number；
By first performance number, with it is last perform DPD processes for the passage when use the of TR
Two performance numbers are compared；Judged whether to perform DPD processes for the passage again according to comparative result.
It is preferred that the judging unit judges whether to perform DPD for the passage again according to comparative result
During process, specifically for：
When first performance number is more than second performance number, and first performance number and described second
When the difference of performance number is more than preset value, it is determined that performing DPD processes for the passage again.
It is from passing through successively it is preferred that the TR that signal power current with UE in the described passage matches
Gathered in the signal data for crossing the UE after average power protection module, the processing of peak power protection module.
It is preferred that when the execution unit performs DPD processes for the passage, specifically for：
The interrupt signal to indicate successful acquisition TR is exported, and gathers feedback sequence corresponding with the TR
FB；
According to the TR and the FB, DPD coefficients are calculated；
When it is determined that the DPD coefficients meet preset requirement, by the DPD coefficient updates to the passage
In corresponding look-up table LUT.
It is preferred that the LUT is the LUT after being extended in the following way to memory space：
LUT address value is compressed according to default suppressed range value.
It is preferred that the execution unit is additionally operable to：
Calculation process is carried out to the data of UE in the passage according to the LUT after renewal, then, judgement processing
Whether the Magnitude Difference of the amplitude of data afterwards and the data of before processing exceedes default threshold range, when described
When difference exceedes the default threshold range, report and alarm, and perform DPD mistakes for the passage again
Journey.
It is preferred that the execution unit is according to the TR and the FB, when calculating DPD coefficients, using iteration
Algorithm, and the calculating parameter for selecting to use according to signal bandwidth.
It is preferred that when the execution unit selects the calculating parameter used according to signal bandwidth, specifically for：
When signal bandwidth is less than or equal to 20MHz, the calculating parameter that selection is used includes：Non-linear rank
Number is that 7, memory depth is that 5, time delay is that -1, cross term is 0；
When signal bandwidth is more than 20MHz, the calculating parameter that selection is used includes：Non-linear exponent number be 7,
Memory depth is that 5, time delay is that -1, cross term is 1.
A kind of DPD execution systems provided in an embodiment of the present invention, including said apparatus.
Brief description of the drawings
, below will be to required in embodiment in order to illustrate more clearly of the technical scheme in the embodiment of the present application
The accompanying drawing used is briefly described, it should be apparent that, drawings in the following description are only the one of the application
A little embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, also
Other accompanying drawings can be obtained according to these accompanying drawings.
Fig. 1 performs the idiographic flow schematic diagram of method for a kind of DPD provided in an embodiment of the present invention；
Fig. 2 is that a kind of forward link of intermediate-freuqncy signal provided in an embodiment of the present invention realizes block diagram；
Fig. 3 performs the overall flow schematic diagram of method for a kind of DPD provided in an embodiment of the present invention；
Fig. 4 is a kind of structural representation of DPD performs devices provided in an embodiment of the present invention.
Embodiment
Method, apparatus and system are performed the embodiments of the invention provide a kind of DPD, to cause DPD to instruct
Practice the LUT and UE of generation signal power real-time matching, it is to avoid power amplifier operation irregularity in RRU or
Burn.
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 DPD provided in an embodiment of the present invention performs method, including：
S101, each passage for performing DPD the need for default, DPD processes are performed for the passage；
Wherein, DPD passage is performed the need for presetting, can be all passages in RRU, also may be used
To be the passage portion in RRU.Can be driving triggering for a certain passage original execution DPD processes
The DPD processes for the passage are performed, such as triggering performs DPD process when setting up cell.
S102, gather the training sequence that signal power current with user equipment (UE) in the passage matches
TR, judges whether to perform DPD processes for the passage again according to the TR.
In step s 102, the training sequence that signal power current with UE in the passage matches is gathered
TR, can periodically gather, or selection random time is acquired, or when default different
Between gather in section, or event triggering property gather etc., the embodiment of the present invention is not construed as limiting to this.And
And, TR process is gathered, for example, can be to perform under the control of a processor.
In step s 102, when having multiple UE signal data simultaneously in the passage, then what is gathered should
The TR that the signal power current with UE matches in passage is：With multiple UE total signal power phase
The TR of matching；When only one of which UE signal data in the passage, then with UE in the passage gathered
The TR that current signal power matches is：The TR matched with the signal power of a UE.
Furthermore, it is necessary to explanation, can perform step S102 during DPD is performed, can also
Step S102 is performed after a DPD has been performed.
It is preferred that in step S101, performing DPD processes for the passage, specifically including：
The TR that signal power current with UE in the passage matches is gathered, when the TR meets preparatory condition
When, DPD coefficients are determined according to the TR.
It is preferred that when the TR meets preparatory condition, determining DPD coefficients according to the TR, specifically including：
Judge whether the power of the TR is more than default power threshold, when it is determined that the power of the TR is more than
During default power threshold, DPD coefficients are determined according to the TR.
It is preferred that when it is determined that the power of the TR is less than default power threshold, start timer, when
After the timer expiry, DPD processes are re-executed.
That is, when it is determined that the power of the TR is less than default power threshold, determining this DPD
Failure is performed, so that, start timer, after the timer expiry, re-execute DPD processes.
During above-mentioned execution DPD, why require that the TR of collection power is more than default thresholding
Value, is in order to ensure that the feedback sequence FB of subsequent acquisition power is unlikely to too small, if FB power is too
It is small, the signal to noise ratio of analog-digital converter (Analog to Digital Converter, ADC) can be caused too poor,
So as to influence DPD effect.Wherein, above-mentioned default power threshold, is, for example, -23dBFs, that is, adopts
The TR collected power, which is more than -23dBFs sides, can continue executing with follow-up DPD flows, so, Ke Yibao
The power for demonstrate,proving the FB of subsequent acquisition is more than -25dBFs, so as to ensure DPD effect.
Introduced in more detail, process is as follows for passage execution DPD processes above-mentioned below：
Step A, gather the TR that signal power current with UE in the passage matches, and determine collection
TR power be more than default power threshold when, export to indicate successful acquisition TR interruption believe
Number, and then gather feedback sequence FB corresponding with the TR；
Here, as a preferred embodiment, collecting after TR, first judge TR power whether
More than default power threshold, output is used to after it is determined that TR power is more than default power threshold
Indicate successful acquisition TR interrupt signal.Certainly, it is determined that collecting after TR, TR power is not entered
Row judges directly to export the interrupt signal to indicate successful acquisition TR, and then gathers corresponding with the TR
Feedback sequence FB, it is also possible.
It is preferred that TR and FB is gathered in identical time slot position, specifically, the 5th of each time slot the
Individual symbol acquisition sequence.Exemplified by gathering TR, for example, can be from the 800th data of the 5th symbol
Point starts collection, and 16384 data points are gathered altogether.If the TR of default collection power threshold is
- 23dBFs, then correspondingly, the I^2+Q^2 aggregate-values of 16384 data points of collection have to be larger than
8.8*10^10.In addition, when gathering TR, when having UE business datum in the passage, then from the business
TR is gathered in data, if the business datum without UE, can select to gather UE non-traffic data,
The open reference signal (Common Reference Signal, CRS) of cell can be for example gathered, when for list
When port is configured, the CRS collected signal power 7.8dB lower than full power, when being configured for dual-port,
The CRS collected signal power 4.8dB lower than full power.
Step B, according to the TR and the FB, calculate DPD coefficients；
Step C, when it is determined that the DPD coefficients meet preset requirement, the DPD coefficient updates are arrived
In look-up table LUT corresponding with the passage.
It is preferred that for example can be determined as follows whether DPD coefficients meet preset requirement：It will calculate
DPD coefficients and the preset value gone out is compared, when DPD coefficients are less than preset value, it is determined that DPD
Coefficient meets preset requirement；When DPD coefficients are more than preset value, then report and alarm, and retriggered TR
Number is adopted with FB.Also, it is preferred that when collection TR and FB number of times is more than default number of times (for example
3 times) when, start timer, the timing length of timer can be set according to actual conditions, for example may be used
To be set to 3 minutes, after the timer expiry, DPD processes are performed for the passage again.
It is preferred that according to the TR and the FB, when calculating DPD coefficients, using iterative algorithm (such as ECMP
Iterative algorithm), and the calculating parameter for selecting to use according to signal bandwidth.
It is preferred that the calculating parameter for selecting to use according to signal bandwidth, is specifically included：
When signal bandwidth is less than or equal to 20MHz, the calculating parameter that selection is used includes：Non-linear rank
Number is that 7, memory depth is that 5, time delay is that -1, cross term is 0；
When signal bandwidth is more than 20MHz, the calculating parameter that selection is used includes：Non-linear exponent number be 7,
Memory depth is that 5, time delay is that -1, cross term is 1.
It is preferred that the LUT of the newest DPD coefficients of above-mentioned preservation, is in the following way to memory space
LUT after being extended：
LUT address value is compressed according to default suppressed range value.
For example, original LUT is 9bit width, its address value is expanded to 1.5 times, 15bit width is obtained
LUT.
It is preferred that calculating DPD coefficients, by newest DPD coefficient updates to corresponding with the passage
After in look-up table LUT, in addition to：
Calculation process is carried out to the data of UE in the passage according to the LUT after renewal, then, judgement processing
Whether the Magnitude Difference of the amplitude of data afterwards and the data of before processing exceedes default threshold range, when described
When difference exceedes the default threshold range, report and alarm, and perform DPD mistakes for the passage again
Journey.
It is preferred that the threshold range, such as can be set to 0.625~1.6.
It is preferred that step S102 is specifically included：
The TR that signal power current with UE in the passage matches periodically is gathered, and counts the TR
The first performance number；
By first performance number, with it is last perform DPD processes for the passage when use the of TR
Two performance numbers are compared；Judged whether to perform DPD processes for the passage again according to comparative result.
It is preferred that being judged whether to perform DPD processes, specific bag for the passage again according to comparative result
Include：
When first performance number is more than second performance number, and first performance number and described second
When the difference of performance number is more than preset value, it is determined that performing DPD processes for the passage again.
Here, preset value can for example be set to 3dB, i.e., described first performance number and second performance number it
When difference is more than 3dB, it is determined that performing DPD processes for the passage again.
It is from passing through successively it is preferred that the TR that signal power current with UE in the above-mentioned passage matches
Gathered in the signal data for crossing the UE after average power protection module, the processing of peak power protection module.
In step S102, judged whether to perform DPD processes for the passage again according to the TR of collection,
Due to being performed by FPGA, thus can also be referred to as be FPGA trigger DPD mode, or
Referred to as changed power triggers DPD mode.
In addition, except the mode (or changed power triggers DPD mode) that DPD is triggered according to above-mentioned FPGA
Judge whether to perform outside DPD processes or triggered according to temperature change for the passage again
DPD mode is judged.
It is preferred that being judged whether to perform DPD processes, specific bag for the passage again according to temperature change
Include：
Whether the change of device drives (DD) query driven temperature exceedes preset value, and (such as preset value is 5
Degree), when temperature change exceedes the preset value, it is determined that performing DPD processes for the passage again.
It is preferred that in step s 102, the signal power current with UE matches in the passage of collection
TR, and during DPD is performed, for calculate DPD calculate in the passage that is gathered with UE
The TR that current signal power matches, can be realized by the link shown in Fig. 2.
The forward link that Fig. 2 show intermediate-freuqncy signal realizes block diagram.
IR interface of the UE signal data from baseband processing unit (BBU) between RRU is transmitted to BBU
In link, first pass around base band and cut module firmly and handled, so, you can be carried out to base band big data
Protection can also reduce the peak-to-average force ratio of baseband signal, and Digital Up Convert (Digital Up are sequentially passed through afterwards
Conversion, DUC) module, despiking coefficient (CFR) module, resume module is cut firmly.Wherein, it is right
In cutting module firmly, its peak clipping thresholding can for example be set to -4BFS, with decimal representation then for 20480, with
Hexadecimal representation is then 5000, so as to eliminate the signal that CFR leakages are cut.Hard module of cutting is afterwards DPD
Module, that is, above-mentioned DPD processes are performed by the DPD module.
It is average power protection module, peak power protection module, this hair respectively after DPD module
Average power protection module is arranged on before peak power protection module by bright embodiment, is primarily due to peak value
Power protection module on the average power of signal after signal transacting on that may produce influence, therefore, using this
Design is more reasonable.Wherein, in peak power protection module, such as the form of hard peak clipping can be used,
Signal more than pre-determined threshold no longer cuts average power, but is directly limited at pre-determined threshold, for door
The setting of limit, for example, could be arranged to -1dBFs, with decimal representation then for 29204, with hexadecimal table
Show to be then 50007214.
After peak power protection module, the EF power of signal is counted, and in the peak power
TR is gathered after protection module, the TR can reflect the current signal powers of UE, the i.e. TR be with
Signal power current UE matches.Wherein, counted for EF power, for example can be according to one
Frame 10ms is statistics length, and the statistics of 100 frames was carried out in 1 second.For TR power,
It can for example be counted according to symbol.After EF power statistical module, respectively automatic growth control
(Automatic Gain Control, AGC) module and digital-to-analogue conversion (Digital-to-Analog Converter,
DAC) module, wherein, AGC is mainly used in the fractional part adjustment to link compensation.DAC module it
Afterwards, correspondence analog link part, may finally transfer data to power amplifier.
For feedback ADC, it can be used for receiving the feedback data that analog link is sent, correspondingly can be
Feedback ADC links realize the collection to FB.
In addition, after IR interfaces, in addition to a base band power statistic module, for real-time statistics base
Band power, and base band power statistic is compared with EF power statistics, when the two power statistic results
Difference exceed preset value (such as 1dB) when, it is believed that be that digital intermediate frequency link has problem, report
Alarm.
A complete embodiment is given below.
Fig. 3 show the overall flow schematic diagram that a kind of DPD provided in an embodiment of the present invention performs method,
Step is as follows：
S301, cell are set up, and now trigger DPD flows.
S302, start perform for the corresponding passage of a certain antenna DPD flows.
S303, triggering FPGA crawls TR.
Specifically, it can be processor triggering FPGA crawls TR, that is to say, that in the control of processor
Under, FPGA crawls TR.Also, the TR of FPGA crawls is the signal work(current with UE in the passage
The TR that rate matches.
S304, wait FPGA grab several interruptions.That is, waiting FPGA to confirm to collect can be used in
After the TR for calculating DPD coefficients, the interrupt signal for indicating successful acquisition TR is exported.
Wherein, wait FPGA to confirm to collect the TR that can be used in calculating DPD coefficients, for example, can be
Confirm that the power for the TR that FPGA is collected is more than default power threshold.
S305, judge whether FPGA exports interrupt signal, if so, being then transferred to S306；Otherwise, it is transferred to
S307。
S306, FPGA capture feedback sequence FB corresponding with TR, and TR and FB are sent to DSP,
DPD coefficients are calculated according to TR and FB by DSP, afterwards, S308 are performed.
S307, judge wait FPGA output interrupt signal time whether be more than 1s, if so, being then transferred to
S311, otherwise, is transferred to S304.
S308, judge whether DSP produces alarm, if not producing alarm, be transferred to S309, otherwise, turn
Enter S310.
Specifically, for example, whether DSP can exceed predetermined threshold value by the DPD coefficients for judging to calculate,
If more than predetermined threshold value, producing alarm, if being not above predetermined threshold value, alarm not produced.
S309, by LUT of the DPD coefficient updates calculated into FPGA, afterwards, perform S315.
S310, judge capture sequence number of times whether be more than 3 times, if so, being transferred to S311；Otherwise, turn
Enter S303.
In the step, it is 3 times to set threshold value, it is of course also possible to be set as others according to actual conditions
Value.
S311, determine DPD flows fail, afterwards, perform S312.
S312, removing state machine, afterwards, perform S313.
S313, startup timer (timing length of timer is for example set to 3 minutes).
S314, waiting timer time-out, afterwards, are transferred to S302.
S315, judge iterations whether be more than 3 times, if so, being transferred to S316, otherwise, be transferred to S303.
S316, judge whether that the corresponding passage of antenna for predetermined number has performed DPD processes, if so,
S317 is transferred to, otherwise, S318 is transferred to.
That is, the corresponding passage of which antenna in RRU is pre-set in the step to be needed to perform DPD
Process, judges to perform the DPD complete DPD processes of the whether equal executed of passage the need for presetting.
S317, flow are normally exited, and are waited and are triggered DPD flows next time.
S318, start to perform DPD flows for the corresponding passage of next antenna, afterwards, be transferred to S303.
S319, judge whether the change of actuation temperature exceedes preset value, if so, be transferred to S302, otherwise,
It is transferred to S320.
Whether S320, FPGA statistics TR changed power are more than 3dB, if so, S302 is transferred to, otherwise,
It is transferred to S321.
Specifically the first power for the TR that statistics is currently gathered, and first power is held with the last time
The TR used during row DPD the second power ratio compared with, if the first power raises 3dB compared with the second power,
Then restart DPD flows (being transferred to S302).In addition, in the embodiment, setting threshold value is 3dB,
Certainly, it is set as that other values are also possible.
S321, according to newest LUT in the passage UE data carry out calculation process.
It is corresponding with above-mentioned DPD execution method, referring to Fig. 4, a kind of DPD provided in an embodiment of the present invention
Performs device, including：
Execution unit 41, for each passage for performing DPD the need for default, holds for the passage
Row DPD processes；
Judging unit 42, matches for gathering signal power current with user equipment (UE) in the passage
Training sequence TR, judges whether to perform DPD processes for the passage again according to the TR.
The device for example can be RRU, more specifically, can be the FPGA in RRU.
It is preferred that the execution unit 41 specifically for：
The TR that signal power current with UE in the passage matches is gathered, when the TR meets preparatory condition
When, DPD coefficients are determined according to the TR.
It is preferred that the execution unit 41 determines DPD when TR meets preparatory condition according to the TR
During coefficient, specifically for：
Judge whether the power of the TR is more than default power threshold, when it is determined that the power of the TR is more than
During default power threshold, DPD coefficients are determined according to the TR.
It is preferred that the execution unit 41 is additionally operable to：When it is determined that the power of the TR is less than default power door
During limit value, start timer, after the timer expiry, re-execute DPD processes.
It is preferred that the judging unit 42 specifically for：
The TR that signal power current with UE in the passage matches periodically is gathered, and counts the TR
The first performance number；
By first performance number, with it is last perform DPD processes for the passage when use the of TR
Two performance numbers are compared；Judged whether to perform DPD processes for the passage again according to comparative result.
It is preferred that the judging unit 42 judges whether to perform for the passage again according to comparative result
During DPD processes, specifically for：
When first performance number is more than second performance number, and first performance number and described second
When the difference of performance number is more than preset value, it is determined that performing DPD processes for the passage again.
It is preferred that the judging unit 42 can be additionally used in：Judged whether again for being somebody's turn to do according to temperature change
Passage performs DPD processes, and specific deterministic process is as follows：
Whether the change of device drives (DD) query driven temperature exceedes preset value, and (such as preset value is 5
Degree), when temperature change exceedes the preset value, it is determined that performing DPD processes for the passage again.
It is from passing through successively it is preferred that the TR that signal power current with UE in the described passage matches
Gathered in the signal data for crossing the UE after average power protection module, the processing of peak power protection module.
It is preferred that when the execution unit 41 performs DPD processes for the passage, specifically for：
The interrupt signal to indicate successful acquisition TR is exported, and gathers feedback sequence corresponding with the TR
FB；
According to the TR and the FB, DPD coefficients are calculated；
When it is determined that the DPD coefficients meet preset requirement, by the DPD coefficient updates to the passage
In corresponding look-up table LUT.
It is preferred that the LUT is the LUT after being extended in the following way to memory space：
LUT address value is compressed according to default suppressed range value.
It is preferred that the execution unit 41 is additionally operable to：
Calculation process is carried out to the data of UE in the passage according to the LUT after renewal, then, judgement processing
Whether the Magnitude Difference of the amplitude of data afterwards and the data of before processing exceedes default threshold range, when described
When difference exceedes the default threshold range, report and alarm, and perform DPD mistakes for the passage again
Journey.
It is preferred that the execution unit 41 is according to the TR and the FB, when calculating DPD coefficients, using repeatedly
For algorithm, and the calculating parameter for selecting to use according to signal bandwidth.
It is preferred that when the execution unit 41 selects the calculating parameter used according to signal bandwidth, it is specific to use
In：
When signal bandwidth is less than or equal to 20MHz, the calculating parameter that selection is used includes：Non-linear rank
Number is that 7, memory depth is that 5, time delay is that -1, cross term is 0；
When signal bandwidth is more than 20MHz, the calculating parameter that selection is used includes：Non-linear exponent number be 7,
Memory depth is that 5, time delay is that -1, cross term is 1.
The embodiment of the present invention, which is additionally provided, at least includes above-mentioned DPD in a kind of DPD execution systems, the system
Performs device.
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 be using complete hardware embodiment, complete software embodiment or knot
The form of embodiment in terms of conjunction software and hardware.Wherein wrapped one or more moreover, the present invention can be used
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 with reference to the production of method according to embodiments of the present invention, equipment (system) and computer program
The flow chart and/or block diagram of product is described.It should be understood that can by computer program instructions implementation process figure and
/ or each flow and/or square frame in block diagram and the 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 and calculate
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 the processing of other programmable datas to set
In the standby computer-readable memory worked in a specific way so that be stored in the computer-readable memory
Instruction produce include the manufacture of command device, the command device realization 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 perform series of operation steps on computer or other programmable devices to produce computer implemented place
Reason, so that the instruction 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 (25)
1. a kind of digital pre-distortion DPD performs method, it is characterised in that this method includes：
DPD each passage is performed the need for for presetting, DPD processes are performed for the passage；
Gather the training sequence TR that signal power current with user equipment (UE) in the passage matches, root
Judge whether to perform DPD processes for the passage again according to the TR.
2. according to the method described in claim 1, it is characterised in that perform DPD processes for the passage,
Specifically include：
The TR that signal power current with UE in the passage matches is gathered, when the TR meets preparatory condition
When, DPD coefficients are determined according to the TR.
3. method according to claim 2, it is characterised in that when the TR meets preparatory condition,
DPD coefficients are determined according to the TR, specifically included：
Judge whether the power of the TR is more than default power threshold, when it is determined that the power of the TR is more than
During default power threshold, DPD coefficients are determined according to the TR.
4. method according to claim 3, it is characterised in that this method also includes：When it is determined that should
When TR power is less than default power threshold, start timer, after the timer expiry, again
Perform DPD processes.
5. according to the method described in claim 1, it is characterised in that gather current with UE in the passage
The training sequence TR that matches of signal power, judged whether to perform for the passage again according to the TR
DPD processes, are specifically included：
The TR that signal power current with UE in the passage matches periodically is gathered, and counts the TR
The first performance number；
By first performance number, with it is last perform DPD processes for the passage when use the of TR
Two performance numbers are compared；Judged whether to perform DPD processes for the passage again according to comparative result.
6. method according to claim 5, it is characterised in that weight is judged whether according to comparative result
DPD processes newly are performed for the passage, are specifically included：
When first performance number is more than second performance number, and first performance number and described second
When the difference of performance number is more than preset value, it is determined that performing DPD processes for the passage again.
7. the method according to any claim of Claims 1 to 5, it is characterised in that in the described passage
The TR that current signal power matches with UE, is from sequentially passing through average power protection module, peak value
Gathered in the signal data of UE after power protection module processing.
8. according to the method described in claim 1, it is characterised in that perform DPD processes for the passage,
Specifically include：
The interrupt signal to indicate successful acquisition TR is exported, and gathers feedback sequence corresponding with the TR
FB；
According to the TR and the FB, DPD coefficients are calculated；
When it is determined that the DPD coefficients meet preset requirement, by the DPD coefficient updates to the passage
In corresponding look-up table LUT.
9. method according to claim 8, it is characterised in that the LUT is in the following way
LUT after being extended to memory space：
LUT address value is compressed according to default suppressed range value.
10. method according to claim 8, it is characterised in that this method also includes：
Calculation process is carried out to the data of UE in the passage according to the LUT after renewal, then, judgement processing
Whether the Magnitude Difference of the amplitude of data afterwards and the data of before processing exceedes default threshold range, when described
When difference exceedes the default threshold range, report and alarm, and perform DPD mistakes for the passage again
Journey.
11. method according to claim 8, it is characterised in that according to the TR and the FB, is calculated
During DPD coefficients, using iterative algorithm, and the calculating parameter for selecting to use according to signal bandwidth.
12. method according to claim 11, it is characterised in that selected to use according to signal bandwidth
Calculating parameter, specifically include：
When signal bandwidth is less than or equal to 20MHz, the calculating parameter that selection is used includes：Non-linear rank
Number is that 7, memory depth is that 5, time delay is that -1, cross term is 0；
When signal bandwidth is more than 20MHz, the calculating parameter that selection is used includes：Non-linear exponent number be 7,
Memory depth is that 5, time delay is that -1, cross term is 1.
13. a kind of digital pre-distortion DPD performs devices, it is characterised in that the device includes：
Execution unit, for each passage for performing DPD the need for default, is performed for the passage
DPD processes；
Judging unit, for gathering the instruction that signal power current with user equipment (UE) in the passage matches
Practice sequence TR, judged whether to perform DPD processes for the passage again according to the TR.
14. device according to claim 13, it is characterised in that the execution unit specifically for：
The TR that signal power current with UE in the passage matches is gathered, when the TR meets preparatory condition
When, DPD coefficients are determined according to the TR.
15. device according to claim 14, it is characterised in that the execution unit is met in TR
During preparatory condition, when determining DPD coefficients according to the TR, specifically for：
Judge whether the power of the TR is more than default power threshold, when it is determined that the power of the TR is more than
During default power threshold, DPD coefficients are determined according to the TR.
16. device according to claim 15, it is characterised in that the execution unit is additionally operable to：
When it is determined that the power of the TR is less than default power threshold, start timer, when the timer expiry
Afterwards, DPD processes are re-executed.
17. device according to claim 13, it is characterised in that the judging unit specifically for：
The TR that signal power current with UE in the passage matches periodically is gathered, and counts the TR
The first performance number；
By first performance number, with it is last perform DPD processes for the passage when use the of TR
Two performance numbers are compared；Judged whether to perform DPD processes for the passage again according to comparative result.
18. device according to claim 17, it is characterised in that the judging unit is according to comparing
When as a result judging whether to perform DPD processes for the passage again, specifically for：
When first performance number is more than second performance number, and first performance number and described second
When the difference of performance number is more than preset value, it is determined that performing DPD processes for the passage again.
19. the device according to any claim of claim 13~17, it is characterised in that the described passage
In the TR that matches of the signal power current with UE, be from sequentially passing through average power protection module, peak
Gathered in the signal data of UE after the processing of value power protection module.
20. device according to claim 13, it is characterised in that the execution unit is logical for this
When road performs DPD processes, specifically for：
The interrupt signal to indicate successful acquisition TR is exported, and gathers feedback sequence corresponding with the TR
FB；
According to the TR and the FB, DPD coefficients are calculated；
When it is determined that the DPD coefficients meet preset requirement, by the DPD coefficient updates to the passage
In corresponding look-up table LUT.
21. device according to claim 20, it is characterised in that the LUT is to use such as lower section
Formula memory space is extended after LUT：
LUT address value is compressed according to default suppressed range value.
22. device according to claim 20, it is characterised in that the execution unit is additionally operable to：
Calculation process is carried out to the data of UE in the passage according to the LUT after renewal, then, judgement processing
Whether the Magnitude Difference of the amplitude of data afterwards and the data of before processing exceedes default threshold range, when described
When difference exceedes the default threshold range, report and alarm, and perform DPD mistakes for the passage again
Journey.
23. device according to claim 20, it is characterised in that the execution unit is according to the TR
With the FB, calculate DPD coefficients when, using iterative algorithm, and according to signal bandwidth select use calculating
Parameter.
24. device according to claim 23, it is characterised in that the execution unit is according to signal
During the calculating parameter that bandwidth selection is used, specifically for：
When signal bandwidth is less than or equal to 20MHz, the calculating parameter that selection is used includes：Non-linear rank
Number is that 7, memory depth is that 5, time delay is that -1, cross term is 0；
When signal bandwidth is more than 20MHz, the calculating parameter that selection is used includes：Non-linear exponent number be 7,
Memory depth is that 5, time delay is that -1, cross term is 1.
25. a kind of digital pre-distortion DPD execution systems, it is characterised in that the system includes claim
Device described in 12~23 any claims.
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