CN101990281B - Method and device for alternation of master and standby display LUTs (Lookup Tables) - Google Patents

Abstract

The invention provides a method for alternation of master and standby display LUTs (Lookup Tables), which is applicable to the condition that memory factors at each level all correspond to a master LUT and a standby LUT, and all master LUTs and all standby LUTs use the amplitude of an input signal as an index to store DPD (Digital Pre-Distortion) parameters. The method comprises the following steps of: S1: carrying out DPD on input signals by using DPD parameters stored by all master LUTs, and updating DPD parameters stored by all standby LUTs; and S2: after the DPD parameters stored by all standby LUTs are updated, carrying out DPD on the input signals by using the DPD parameters stored by all standby LUTs and updating the DPD parameters stored by all master LUTs, and returning to the step S1 after the DPD parameters stored by all master LUTs are updated. The invention also provides a device for alternation of master and standby display LUTs. The invention realizes alternation of master and standby display LUTs.

Description

The method and apparatus of active and standby demonstration look-up table alternation

Technical field

The present invention relates to digital pre-distortion (DPD, DigitalPre-Distortion) treatment technology, relate in particular to the technology of active and standby demonstration look-up table (LUT, Look-Up-Table) alternation.

Background technology

At present, people have launched a large amount of discussion and introduction for the theoretical algorithm of DPD.The theoretical algorithm of existing DPD is mostly based on the memory multinomial, and the Mathematical Modeling of input signal being carried out the DPD processing is as follows:

$z\left(n\right)=\underset{m=0}{\overset{M}{\mathrm{\Σ}}}x(n-m)\underset{q=1}{\overset{Q}{\mathrm{\Σ}}}{w}_{m,q}{\left|x(n-m)\right|}^{(q-1)}$

$=\underset{m=0}{\overset{M}{\mathrm{\Σ}}}x(n-m)\·{\mathrm{LUT}}_m\left(\right|x(n-m)\left|\right)$

${\mathrm{LUT}}_m\left(\right|x(n-m)\left|\right)=\underset{q=1}{\overset{Q}{\mathrm{\Σ}}}{w}_{m,q}{\left|x(n-m)\right|}^{(q-1)},m=1...M,n=1...N$

Wherein, w _{M, q}, m=1...M, q=1...Q are the DPD coefficients that the DPD adaptive-filtering calculates, and after calculating the DPD coefficient, just can utilize the DPD coefficient calculations to obtain DPD signal y (n).

LUT _m(| x (n-m) |) be the amplitude take input signal | x (n-m) | be the DPD parameter of index.Carry out the DPD processing unit of DPD processing when carrying out the renewal of DPD parameter, according to | x (n-m) | storage DPD parameter, when carrying out the DPD processing, according to | x (n-m) | extract the DPD parameter.

In actual applications, whenever finish DPD coefficient calculations after, the DPD parameter that is kept at LUT will all be updated once.In the process of upgrading the DPD parameter, if extract the LUT parameter of upgrading, will be so that DPD processes unstable, this be because, LUT is dual port random access memory (RAM, Random Access Memory), readable writing, also readable (extraction) DPD parameter when writing the DPD parameter that (renewal) LUT preserves.Can find out that from following formula the DPD processing is divided into the M level: $z\left(n\right)=\underset{m=0}{\overset{M}{\mathrm{\Σ}}}x(n-m)\·{\mathrm{LUT}}_m\left(\right|x(n-m)\left|\right),$ That is to say, every one-level memory fact has a LUT table.If the DPD coefficient is in update mode, finished m=0,1,2 renewal, but also do not carry out m=3,4, ... the renewal of M, at this moment, for the DPD processing of signal, some DPD parameter is original DPD parameter, another part DPD parameter is new DPD parameter, like this, the situation that new and old DPD parameter is used alternatingly just occurred when upgrading the DPD parameter, from emulation, the DPD effect of this moment is not fine.

For reach the LUT parameter upgrade before and after the DPD treatment system be in the purpose of stable state, active and standby LUT need to be set, still, prior art is not introduced how alternation of active and standby LUT.

Summary of the invention

The invention provides the method and apparatus of active and standby demonstration look-up table alternation, in order to realize the alternation of active and standby LUT.

The invention provides the method for a kind of active and standby demonstration look-up table alternation, be applicable to all scenes of a corresponding primary LUT and a LUT for subsequent use of every one-level memory fact, all primary LUT and all LUT for subsequent use all preserve the DPD parameter take the amplitude of input signal as index, described method comprises: S1: the DPD parameter of using all primary LUT to preserve is carried out DPD to input signal and is processed, the DPD parameter of simultaneously, all LUT for subsequent use being preserved is upgraded; S2: after the DPD parameter that all LUT for subsequent use are preserved is upgraded and finished, the DPD parameter of using all LUT for subsequent use to preserve is carried out DPD to input signal and is processed, simultaneously, the DPD parameter that all primary LUT preserve is upgraded, the DPD parameter that all primary LUT are preserved is returned S1 after upgrading and finishing.

The present invention also provides the device of a kind of active and standby demonstration look-up table alternation, be applicable to all scenes of a corresponding primary LUT and a LUT for subsequent use of every one-level memory fact, all primary LUT and all LUT for subsequent use all preserve the DPD parameter take the amplitude of input signal as index, described device comprises: the DPD processing unit is used for using the DPD parameter that input signal is carried out DPD and processes; DPD parameter updating block is used for the DPD parameter that LUT preserves is upgraded; Wherein, the DPD parameter that the DPD processing unit uses all primary LUT to preserve was carried out the DPD processing to input signal when, DPD parameter updating block upgraded the DPD parameter that all LUT for subsequent use preserve; After the DPD parameter that DPD parameter updating block is preserved all LUT for subsequent use is upgraded and is finished, the DPD parameter that the DPD processing unit uses all LUT for subsequent use to preserve is carried out DPD to input signal and is processed, simultaneously, DPD parameter updating block upgrades the DPD parameter that all primary LUT preserve; After the DPD parameter renewal that DPD parameter updating block is preserved all primary LUT was finished, the DPD processing unit re-used the DPD parameter of all primary LUT preservations input signal is carried out DPD processing, so circulation.

In the present invention, the DPD parameter of using primary LUT to preserve is carried out the DPD processing to input signal when, the DPD parameter that LUT for subsequent use preserves is upgraded, after the DPD parameter renewal that LUT for subsequent use preserves is finished, the DPD parameter that re-uses LUT preservation for subsequent use is carried out the DPD processing to input signal, simultaneously, the DPD parameter that primary LUT preserves is upgraded, after the DPD parameter renewal that primary LUT preserves is finished, the DPD parameter that re-uses primary LUT preservation is carried out the DPD processing to input signal, simultaneously, the DPD parameter that LUT for subsequent use preserves is upgraded, so circulation has realized primary LUT and LUT alternation for subsequent use.

Description of drawings

In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the flow chart of the method for a kind of active and standby demonstration look-up table of the present invention alternation;

Fig. 2 is the logical construction schematic diagram of the device of a kind of active and standby demonstration look-up table of the present invention alternation;

Fig. 3 is the schematic diagram of a kind of primary LUT of the present invention and LUT alternation state for subsequent use;

Fig. 4 is the schematic diagram of the specific embodiment of a primary LUT of the present invention and LUT alternation for subsequent use;

Fig. 5 is a kind of schematic diagram that primary LUT of the present invention and LUT for subsequent use switch;

Fig. 6 is the flow chart that the DPD parameter that LUT is preserved of the present invention is upgraded;

Fig. 7 is a kind of schematic diagram that LUT of the present invention preserves the DPD parameter;

Fig. 8 is the another kind of schematic diagram that LUT of the present invention preserves the DPD parameter;

Fig. 9 is that sequential update of the present invention is a kind of schematic diagram of the numerical value of 0 DPD parameter;

Figure 10 is a kind of schematic diagram that backward of the present invention is revised as the numerical value of 0 DPD parameter;

LUT amplitude schematic diagram when Figure 11 is the numerical value that is not revised as 0 DPD parameter of the present invention;

LUT amplitude schematic diagram when Figure 12 is the numerical value that is revised as 0 DPD parameter of the present invention.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.

At first some technology points that the present invention relates to are described.

The DPD parameter that the present invention mentions can represent with following mathematical expression:

${\mathrm{LUT}}_m\left(\right|x(n-m)\left|\right)=\underset{q=1}{\overset{Q}{\mathrm{\Σ}}}{w}_{m,q}{\left|x(n-m)\right|}^{(q-1)},m=1...M,n=1...N$

Wherein, LUT _m(| x (n-m) |) is DPD parameter, w _{M, q}Be the DPD coefficient.DPD processes can be divided into the M level: $z\left(n\right)=\underset{m=0}{\overset{M}{\mathrm{\Σ}}}x(n-m)\·{\mathrm{LUT}}_m\left(\right|x(n-m)\left|\right).$ Every one-level memory fact is a corresponding primary LUT and a LUT for subsequent use all, so, total 2*M LUT in the system that carries out the DPD processing.

All technical schemes of the present invention all are applicable to all scenes of a corresponding primary demonstration look-up table LUT and a LUT for subsequent use of every one-level memory fact, and all primary LUT and all LUT for subsequent use all preserve the DPD parameter take the amplitude of input signal as index.

The input signal that the present invention mentions refers to input the intermediate-freuqncy signal of the system that carries out the DPD processing, feedback signal refers to power amplifier (PA, Power Amplifier) signal through analog to digital converter (ADC, Analog-to-Digital Converter) sampling that is coupled and.

The below describes the method for a kind of active and standby demonstration look-up table of the present invention alternation.As shown in Figure 1, this method comprises:

S101: the DPD parameter of using all primary LUT to preserve is carried out the DPD processing to input signal, simultaneously, the DPD parameter that all LUT for subsequent use preserve is upgraded;

S102: after the DPD parameter that all LUT for subsequent use are preserved is upgraded and finished, the DPD parameter of using all LUT for subsequent use to preserve is carried out DPD to input signal and is processed, simultaneously, the DPD parameter that all primary LUT preserve is upgraded, the DPD parameter that all primary LUT are preserved is returned S101 after upgrading and finishing.

The DPD parameter of in actual applications, can be in the following manner a LUT corresponding to any one-level memory fact being preserved be upgraded: to the processing that feedback signal is carried out down-conversion rate, filtering, eliminated mirror image, amplitude adjustment, phase place adjustment and frequency are adjusted; Analytic equation obtains the DPD coefficient, that is to say, utilize feedback signal and the relation between the DPD coefficient, the i.e. XW=Y (X is feedback signal, and Y is input signal) of input signal, the above-mentioned processing of process, obtain DPD coefficient W by matrix inversion, namely PA's is contrary; Amplitude according to DPD coefficient and input signal obtains the DPD parameter; Deposit the DPD parameter that obtains in LUT.In this manner, can upgrade the DPD parameter that LUT corresponding to every one-level memory fact preserves.

In actual applications, not that DPD parameter corresponding to each index has numerical value, for such DPD parameter, its numerical value all is set to zero.But if these null values are used when carrying out the DPD processing, the DPD signal that obtains so can be incorrect.To this, in the process that the DPD parameter that corresponding to an any one-level memory fact LUT preserves is upgraded, be zero if the numerical value of DPD parameter is arranged, can be the numerical value that the numerical value of zero DPD parameter is revised as the non-vanishing DPD parameter of numerical value so with numerical value.

Concrete, can be the numerical value that the numerical value of zero DPD parameter is revised as the non-vanishing DPD parameter of numerical value in the following manner with a numerical value: with described numerical value be the numerical value of zero DPD parameter be revised as numerical value non-vanishing, in LUT ordering at described numerical value be before zero the DPD parameter and with described numerical value be the numerical value of the most adjacent DPD parameter of zero DPD parameter.Also can be the numerical value that the numerical value of zero DPD parameter is revised as the non-vanishing DPD parameter of numerical value in the following manner with a numerical value: with described numerical value be the numerical value of zero DPD parameter be revised as numerical value non-vanishing, in LUT ordering after described numerical value is zero DPD parameter and with described numerical value be the numerical value of the most adjacent DPD parameter of zero DPD parameter.

Corresponding to the method for above-mentioned active and standby demonstration look-up table alternation, the present invention also provides the device of a kind of active and standby demonstration look-up table alternation.As shown in Figure 2, be applicable to all scenes of a corresponding primary LUT and a LUT for subsequent use of every one-level memory fact, described device comprises: DPD processing unit 201 is used for using the DPD parameter that input signal is carried out DPD and processes; DPD parameter updating block 202 is used for the DPD parameter that LUT preserves is upgraded; Wherein, the DPD parameter that DPD processing unit 201 uses all primary LUT to preserve was carried out the DPD processing to input signal when, the DPD parameter that 202 couples of all LUT for subsequent use of DPD parameter updating block preserve was upgraded; After the DPD parameter that 202 couples of all LUT for subsequent use of DPD parameter updating block preserve is upgraded and is finished, the DPD parameter that DPD processing unit 201 uses all LUT for subsequent use to preserve is carried out DPD to input signal and is processed, simultaneously, the DPD parameter of 202 pairs of all primary LUT preservations of DPD parameter updating block is upgraded.

DPD parameter updating block 202 can comprise: first processes subelement, is used for the processing to feedback signal is carried out down-conversion rate, filtering, eliminated mirror image, amplitude adjustment, phase place adjustment and frequency are adjusted; Second processes subelement, be used for analytic equation, obtain the DPD coefficient, that is to say, utilize feedback signal and the relation between the DPD coefficient, the i.e. XW=Y (X is feedback signal, and Y is input signal) of input signal, the above-mentioned processing of process, obtain DPD coefficient W by matrix inversion, namely PA's is contrary; The 3rd processes subelement, obtains the DPD parameter for the DPD coefficient that obtains according to the second processing subelement and the amplitude of input signal; Preserve subelement, be used for depositing the DPD parameter that the 3rd processing subelement obtains in LUT.DPD parameter updating block can upgrade the DPD parameter that LUT corresponding to every one-level memory fact preserves.

In actual applications, not that DPD parameter corresponding to each index has numerical value, for such DPD parameter, its numerical value all is set to zero.But if these null values are used when carrying out the DPD processing, the DPD signal that obtains so can be incorrect.To this, DPD parameter updating block is in the process that the DPD parameter that a LUT corresponding to any one-level memory fact preserves is upgraded, if it is zero that the numerical value of DPD parameter is arranged, then be the numerical value that the numerical value of zero DPD parameter is revised as the non-vanishing DPD parameter of numerical value with numerical value.

Concrete, when DPD parameter updating block 202 is revised as the numerical value of the non-vanishing DPD parameter of numerical value at the numerical value that with a numerical value is zero DPD parameter, can be with described numerical value the numerical value of zero DPD parameter be revised as numerical value non-vanishing, in LUT ordering at described numerical value be before zero the DPD parameter and with described numerical value be the numerical value of the most adjacent DPD parameter of zero DPD parameter.DPD parameter updating block 202 also can be with described numerical value the numerical value of zero DPD parameter be revised as numerical value non-vanishing, in LUT ordering after described numerical value is zero DPD parameter and with described numerical value be the numerical value of the most adjacent DPD parameter of zero DPD parameter.

For making those skilled in the art more clearly understand the present invention, below the present invention is described in detail.

Fig. 3 is the schematic diagram of a kind of primary LUT and LUT alternation state for subsequent use.As shown in Figure 3, primary LUT is stored among the RAM, and LUT for subsequent use is stored in another RAM.When carrying out the DPD processing, the DPD parameter that the RAM at primary LUT place provides primary LUT to preserve to the high speed predistortion processor, the DPD parameter that the high speed predistortion processor uses primary LUT to preserve is carried out DPD to input signal and is processed, simultaneously, the RAM at LUT for subsequent use place upgrades the DPD parameter that LUT for subsequent use preserves.After the DPD parameter that the RAM at LUT for subsequent use place preserves LUT for subsequent use is upgraded and is finished, the DPD parameter of LUT preservation for subsequent use is provided to the high speed predistortion processor, the DPD parameter that the high speed predistortion processor uses LUT for subsequent use to preserve is carried out DPD to input signal and is processed, simultaneously, the RAM at primary LUT place upgrades the DPD parameter that primary LUT preserves.After the DPD parameter that the RAM at primary LUT place preserves primary LUT is upgraded and is finished, the DPD parameter that the RAM at primary LUT place provides primary LUT to preserve to the high speed predistortion processor again, so circulation is gone down.

That shown in Figure 4 namely is the embodiment of a primary LUT and LUT alternation for subsequent use.As shown in Figure 4, at first carry out S401, carry out the system default LUT-BANK1 of DPD processing as main LUT, the DPD parameter that LUT-BANK1 preserves is used by hardware.Afterwards, carry out S402, LUT-BANK0 is upgraded.After finishing renewal, carry out S403, the DPD parameter that notice hardware uses LUT-BANK0 to preserve.Afterwards, carry out S404, LUT-BANK1 is emptied.To LUT-BANK1 empty finish after, carry out S405, LUT-BANK1 is upgraded.After finishing renewal, carry out S406, the DPD parameter that notice hardware uses LUT-BANK1 to preserve.Afterwards, carry out S407, LUT-BANK0 is emptied.To LUT-BANK0 empty finish after, carry out again S402.

In actual applications, the DPD parameter of a LUT preservation is used by hardware, and the DPD parameter that another LUT preserves is by software upgrading.For the LUT among the DPD, the memory of M level is arranged, every one-level memory fact is a corresponding primary LUT and LUT for subsequent use all, so, carry out having 2*M LUT in the system that DPD processes, after primary LUT and LUT for subsequent use finished and switch, the numerical value of the DPD parameter among primary LUT and the LUT for subsequent use was consistent.Primary LUT and LUT for subsequent use switch as shown in Figure 5.

The process that the DPD parameter that LUT is preserved is upgraded comprises the steps: as shown in Figure 6

S601: after carrying out system's startup of DPD processing, enter wait state, concrete, wait for that the triggering that DPD processes starts;

S602:DPD judges whether to withdraw from DPD adaptive updating coefficient state after processing and starting, and if so, then returns wait state, otherwise, turn S603;

S603: capture-data;

S604: after catching certain data, judge whether the DPD coefficient update is finished, if so, then turn S608, otherwise, turn S605;

S605: to feedback signal carry out down-conversion rate, filtering, eliminate mirror image, the processing such as amplitude adjustment, phase place adjustment and frequency adjustment;

S606: analytic equation, obtain the DPD coefficient, that is to say, utilize input signal, feedback signal and the relation between the DPD coefficient, i.e. XW=Y (X is feedback signal, and Y is input signal) through processing among the S605, obtain DPD coefficient W by matrix inversion, namely PA's is contrary;

S607: record this DPD coefficient update state, state for example is successfully or finishes;

S608: obtain the DPD parameter according to DPD coefficient and input signal;

S609: owing to need to repeatedly upgrade the DPD parameter, whether finish so need to judge the renewal of DPD parameter, if so, turn S610, otherwise, turn S602;

After the S610:DPD parameter was upgraded and finished, the DPD parameter that notice hardware uses this LUT to preserve was carried out DPD and is processed;

S611: start new DPD coefficient update state, mark DPD coefficient is not finished, and turns S602.

As shown in Figure 6, when carrying out the DPD coefficient update, need once correct DPD coefficient solution procedure.Obtain after the DPD coefficient, need the multi collect data to carry out the renewal process of DPD parameter.

In actual applications, LUT preserves the DPD parameter take the amplitude of input signal as index, and Fig. 7 is the schematic diagram that LUT preserves the DPD parameter, 1,2 among Fig. 7 ..., N-1, N are the amplitude of input signal.After repeatedly the DPD parameter was upgraded and to be finished, not every amplitude index that is to say all to the Effective Numerical of DPD parameter should be arranged, and the numerical value of the DPD parameter that certain or some index is corresponding is 0.To this, before LUT switches, the numerical value for 0 DPD parameter can be revised as the Effective Numerical of DPD parameter corresponding to contiguous index.

The numerical value of the DPD parameter that as shown in Figure 8, n=0 and n=N-2 are corresponding is 0.If after LUT switches, these are that 0 numerical value is used as DPD and processes, and the DPD signal that obtains so will be incorrect.To this, can judge whether each numerical value among the LUT equals zero, if equal zero, so can be according to nearby principle, will be revised as for 0 numerical value contiguous numerical value and not be the numerical value of 0 DPD parameter.

In actual applications, can there be various ways to be revised as 0 numerical value.The below simply introduces two kinds of implementations.

First kind of way: sequential update.

As shown in Figure 9, if the numerical value of LUT (K) is 0, so the numerical value of LUT (K) is revised as the numerical value of LUT (K+1), judges successively, revise from 0 to N-2 according to K.

The second way: backward is revised.

As shown in figure 10, if the numerical value of LUT (K) is 0, so the numerical value of LUT (K) is revised as the numerical value of LUT (K-1), judges successively, revise from N-1 to 1 according to K.

If adopt nearby principle to be revised as 0 numerical value, then realize simply, computing that need not be extra, simulated effect is also more satisfactory.Figure 11 is the LUT amplitude schematic diagram when not being revised as 0 numerical value.Figure 12 is the LUT amplitude schematic diagram when being revised as 0 numerical value.

Before LUT switched, LUT has been transfused to the amplitude filling of signal to be finished.After LUT switched, the DPD parameter among the multistage memory LUT had all been finished renewal, after DPD when processing, just all use the DPD parameters after the renewals.Like this, use the DPD parameter after the same set of renewal, DPD is processed stable, the problem that can not exist new and old DPD parameter to be used alternatingly.In addition, the DPD parameter is preserved and the DPD parameter extraction can be respectively operates separately LUT, on flow process also so that the processing of software can not occur unusually.

Adopt primary LUT and LUT Switch mode for subsequent use so that the processing of DPD is stable, to be easy to control.Although increased RAM, for the resource of existing field programmable gate array (FPGA, FieldProgrammable Gate Array), the RAM of increase is acceptable.General, the memory depth M=6 of DPD, every one-level memory fact N=256, what LUT preserved is plural number, is divided into I, Q two-way, each way value is preserved precision D=16.The RAM that adopts primary LUT and LUT Switch mode for subsequent use to take is as follows:

N*M*2*D*2＝256*6*2*16*2＝98304(BIT)＝96KBIT。

The RAM that does not use primary LUT and LUT Switch mode for subsequent use to take is as follows:

N*M*2*D＝48KBIT。

At present, a BLOCK RAM in the VIRTEX-5 chip of XILINX company can preserve 36K BIT signal, so, adopt primary LUT and LUT Switch mode for subsequent use also just to take 3 BLOCK-RAM, do not adopt primary LUT and LUT Switch mode for subsequent use need to take 1.5 (2) BLOCK-RAM.A VIRTEX-5 chip has 100 polylith BLOCK-RAM usually, so adopting the resource of 1～2 BLOCK-RAM that primary LUT and LUT Switch mode for subsequent use taken more is complete acceptable.

In sum, in the present invention, before and after the DPD parameter was upgraded, DPD processed and is in stable state always, had avoided mixing the new and old DPD parameter of use.

One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to come the relevant hardware of instruction to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process such as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-OnlyMemory, ROM) or random store-memory body (Random Access Memory, RAM) etc.

The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (10)

1. the method for active and standby demonstration look-up table alternation, it is characterized in that, be applicable to all scenes of a corresponding primary demonstration look-up table LUT and a LUT for subsequent use of every one-level memory fact, all primary LUT and all LUT for subsequent use all preserve digital pre-distortion DPD parameter take the amplitude of input signal as index, and described method comprises:

S1: the DPD parameter of using all primary LUT to preserve is carried out the DPD processing to input signal, simultaneously, the DPD parameter that all LUT for subsequent use preserve is upgraded;

S2: after the DPD parameter that all LUT for subsequent use are preserved is upgraded and finished, the DPD parameter of using all LUT for subsequent use to preserve is carried out DPD to input signal and is processed, simultaneously, the DPD parameter that all primary LUT preserve is upgraded, the DPD parameter that all primary LUT are preserved is returned S1 after upgrading and finishing.

2. the method for claim 1 is characterized in that, the DPD parameter of in the following manner a LUT corresponding to any one-level memory fact being preserved is upgraded:

To the processing that feedback signal is carried out down-conversion rate, filtering, eliminated mirror image, amplitude adjustment, phase place adjustment and frequency are adjusted;

Utilize the relation between input signal, treated feedback signal and the DPD coefficient, by matrix inversion, obtain the DPD coefficient, wherein, the pass between input signal, treated feedback signal and the DPD coefficient is XW=Y, and X is feedback signal, Y is input signal, and W is the DPD coefficient;

Amplitude according to DPD coefficient and input signal obtains the DPD parameter;

Deposit the DPD parameter that obtains in LUT.

3. method as claimed in claim 1 or 2, it is characterized in that, in the process that the DPD parameter that a LUT corresponding to any one-level memory fact preserves is upgraded, if it is zero that the numerical value of DPD parameter is arranged, then be the numerical value that the numerical value of zero DPD parameter is revised as the non-vanishing DPD parameter of numerical value with numerical value.

4. method as claimed in claim 3, it is characterized in that, be the numerical value that the numerical value of zero DPD parameter is revised as the non-vanishing DPD parameter of numerical value in the following manner with a numerical value: with described numerical value be the numerical value of zero DPD parameter be revised as numerical value non-vanishing, in LUT ordering at described numerical value be before zero the DPD parameter and with described numerical value be the numerical value of the most adjacent DPD parameter of zero DPD parameter.

5. method as claimed in claim 3, it is characterized in that, be the numerical value that the numerical value of zero DPD parameter is revised as the non-vanishing DPD parameter of numerical value in the following manner with a numerical value: with described numerical value be the numerical value of zero DPD parameter be revised as numerical value non-vanishing, in LUT ordering after described numerical value is zero DPD parameter and with described numerical value be the numerical value of the most adjacent DPD parameter of zero DPD parameter.

6. the device of active and standby demonstration look-up table alternation, it is characterized in that, be applicable to all scenes of a corresponding primary LUT and a LUT for subsequent use of every one-level memory fact, all primary LUT and all LUT for subsequent use all preserve digital pre-distortion DPD parameter take the amplitude of input signal as index, and described device comprises:

The DPD processing unit is used for using the DPD parameter that input signal is carried out DPD and processes;

DPD parameter updating block is used for the DPD parameter that LUT preserves is upgraded;

Wherein, the DPD parameter that the DPD processing unit uses all primary LUT to preserve was carried out the DPD processing to input signal when, DPD parameter updating block upgraded the DPD parameter that all LUT for subsequent use preserve;

After the DPD parameter that DPD parameter updating block is preserved all LUT for subsequent use is upgraded and is finished, the DPD parameter that the DPD processing unit uses all LUT for subsequent use to preserve is carried out DPD to input signal and is processed, simultaneously, DPD parameter updating block upgrades the DPD parameter that all primary LUT preserve;

After the DPD parameter renewal that DPD parameter updating block is preserved all primary LUT was finished, the DPD processing unit re-used the DPD parameter of all primary LUT preservations input signal is carried out DPD processing, so circulation.

7. device as claimed in claim 6 is characterized in that, DPD parameter updating block comprises:

First processes subelement, is used for the processing to feedback signal is carried out down-conversion rate, filtering, eliminated mirror image, amplitude adjustment, phase place adjustment and frequency are adjusted;

Second processes subelement, be used for utilizing input signal, process the feedback signal of subelement processing and the relation between the DPD coefficient through first, pass through matrix inversion, obtain the DPD coefficient, wherein, the pass between input signal, treated feedback signal and the DPD coefficient is XW=Y, and X is feedback signal, Y is input signal, and W is the DPD coefficient;

The 3rd processes subelement, obtains the DPD parameter for the DPD coefficient that obtains according to the second processing subelement and the amplitude of input signal;

Preserve subelement, be used for depositing the DPD parameter that the 3rd processing subelement obtains in LUT.

8. such as claim 6 or 7 described devices, it is characterized in that, DPD parameter updating block is in the process that the DPD parameter that a LUT corresponding to any one-level memory fact preserves is upgraded, if it is zero that the numerical value of DPD parameter is arranged, then be the numerical value that the numerical value of zero DPD parameter is revised as the non-vanishing DPD parameter of numerical value with numerical value.

9. device as claimed in claim 8, it is characterized in that, when DPD parameter updating block is revised as the numerical value of the non-vanishing DPD parameter of numerical value at the numerical value that with a numerical value is zero DPD parameter, with described numerical value be the numerical value of zero DPD parameter be revised as numerical value non-vanishing, in LUT ordering at described numerical value be before zero the DPD parameter and with described numerical value be the numerical value of the most adjacent DPD parameter of zero DPD parameter.

10. device as claimed in claim 8, it is characterized in that, when DPD parameter updating block is revised as the numerical value of the non-vanishing DPD parameter of numerical value at the numerical value that with a numerical value is zero DPD parameter, with described numerical value be the numerical value of zero DPD parameter be revised as numerical value non-vanishing, in LUT ordering after described numerical value is zero DPD parameter and with described numerical value be the numerical value of the most adjacent DPD parameter of zero DPD parameter.

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