CN104836627A - Method for cooperative work between digital predistortion and antenna calibration, and system - Google Patents
Method for cooperative work between digital predistortion and antenna calibration, and system Download PDFInfo
- Publication number
- CN104836627A CN104836627A CN201410049123.4A CN201410049123A CN104836627A CN 104836627 A CN104836627 A CN 104836627A CN 201410049123 A CN201410049123 A CN 201410049123A CN 104836627 A CN104836627 A CN 104836627A
- Authority
- CN
- China
- Prior art keywords
- coefficient
- antenna calibration
- distortion
- digital pre
- storehouse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses a method for cooperative work between digital predistortion and antenna calibration, and a system. The method comprises: S1, performing a digital predistortion coefficient calculation, storing a new digital predistortion coefficient to a second digital predistortion coefficient stack, triggering the antenna calibration, and performing predistortion processing on a calibration coefficient using the digital predistortion coefficient stored in the second digital predistortion coefficient stack when the antenna calibration sequence is sent; S2, performing an antenna calibration coefficient calculation according to the antenna calibration sequence, and storing a new antenna calibration coefficient to a second antenna calibration coefficient stack; and S3, simultaneously updating the digital predistortion coefficient stack and the antenna calibration coefficient stack, and returning to step S1. Simultaneous coefficient switching is performed on the antenna calibration coefficient matching the new digital predistortion coefficient obtained by the digital predistortion, so channel amplitude and phase characteristic changes caused by a change of the digital distortion coefficient is prevented, and the cooperative work between the digital predistortion and the antenna calibration is achieved.
Description
Technical field
The present invention relates to communication technical field, particularly relate to the method and system of a kind of digital pre-distortion and antenna calibration collaborative work.
Background technology
Antenna calibration is to eliminate the interchannel sensor gain and phase uncertainties of multi-antenna transmission receiving system many, obtaining the lobe pattern of expection after making intelligent antenna beam shaping.Antenna calibration needs to measure transmitting and receiving passage, to calculate the magnitude-phase characteristics of each passage, and calculates corresponding compensating factor accordingly, carries out multiplication operation by compensating factor and business datum, reach the object eliminating interchannel amplitude phase unbalance.Digital pre-distortion technology is a kind of linearization technique, in order to eliminate the nonlinear distortion component of power amplifier, and the linearity of elevator system, and then promote transmission signal quality and system effectiveness, digital pre-distortion also can regard a kind of channel compensation technology as.Antenna calibration and digital pre-distortion are all carry out the computing of width phase to signal, if between the two can not co-ordination, will inevitably influence each other, and it is unfavorable to produce to the process of the other side.
The working method that general digital pre-distortion coordinates with antenna calibration is the rear end of digital pre-distortion at antenna calibration, therefore the digital pre-distortion being in rear end can have an impact to the result of antenna calibration, as after antenna calibration is corrected, should the characteristic of channel be kept constant afterwards as far as possible, but the usual digital pre-distortion federation change characteristic of channel more or less.
Prior art is after having upgraded digital pre-distortion coefficient, and transmitting chain amplitude and phase response change, and need trigger an antenna calibration, recalculates amplitude and the phase response information of every bar transmitting chain, then obtains the penalty coefficient of new transmitting branch.The shortcoming of this processing mode is after digital pre-distortion coefficient update and antenna calibration obtains in the time period before new penalty coefficient, the consistency of many transmitting chain amplitudes and phase place cannot be ensured, wherein the consistency of amplitude mainly refers to the consistency of fluctuation in transmitting chain band amplitude, because digital pre-distortion can't change signal transmission power under normal circumstances, but in some cases, after digital pre-distortion also can there is minor fluctuations in total power signal value, and phase equalization mainly refers to the consistency of link phase fluctuation.
Summary of the invention
(1) technical problem that will solve
For above-mentioned defect, the technical problem to be solved in the present invention is how by the collaborative work between digital pre-distortion and antenna calibration, avoids, because coefficient does not mate, causing interchannel amplitude phase unbalance between the two.
(2) technical scheme
For solving the problem, the invention provides a kind of method of digital pre-distortion and antenna calibration collaborative work, comprising:
S1, carry out digital pre-distortion coefficient calculations, by new digital pre-distortion coefficient storage in the second digital pre-distortion coefficient storehouse, and trigger antenna calibration, when transmitting antenna calibrating sequence, the digital pre-distortion coefficient be stored in the second digital pre-distortion coefficient storehouse is used to carry out pre-distortion to calibrating sequence;
S2, carry out antenna calibration coefficient calculations according to antenna calibration sequence, by new antenna calibration coefficient storage in the second antenna calibration coefficient storehouse;
S3, digital pre-distortion coefficients storehouse and antenna calibration coefficient storehouse to be upgraded simultaneously, and return step S1.
Further, after step S1 carries out digital pre-distortion coefficient calculations, comprised before new digital pre-distortion coefficient storage is in the second digital pre-distortion coefficient storehouse:
Digital pre-distortion coefficient is used to carry out pre-distortion to one group of sequence, calculate mean square error between the sequence after pre-distortion and target sequence, judge that whether this mean square error is more than the first pre-determined threshold, if do not exceeded, stores, otherwise return and recalculate digital pre-distortion coefficient.
Further, after step S2 carries out antenna calibration coefficient calculations, also comprised before new antenna calibration coefficient storage is in the second antenna calibration coefficient storehouse:
Judge that whether described antenna calibration coefficient calculations obtains the signal to noise ratio of the antenna calibration sequence signal gathered more than the second pre-determined threshold, if exceeded, store, otherwise calculate to antenna calibration the number of times unsuccessfully recurred to judge, if exceed preset times, reset, return step S1, otherwise carry out coefficient weighted calculation.
Further, described coefficient weighted calculation specifically comprises:
Utilize the smoothing process of digital pre-distortion coefficient obtained before and after upgrading, the smoothing factor C=a*C1+b*C2 obtained, and using smoothing factor as new digital pre-distortion coefficient, return step S1, wherein C1 is for upgrading front digital pre-distortion coefficient, and C2 is digital pre-distortion coefficient after renewal, and a, b are weight coefficient respectively, 0<a<1,0<b<1 and a+b=1.
Further, described in be reset to warm reset, be specially and return to pass-through state and carry out antenna calibration process.
Further, when digital pre-distortion coefficients storehouse and antenna calibration coefficient storehouse are upgraded simultaneously, the second antenna calibration coefficient storehouse that the second digital pre-distortion coefficient storehouse and storage that store the digital pre-distortion coefficient being about to renewal are about to the antenna calibration coefficient upgraded is changed in the first digital pre-distortion coefficient storehouse and the first antenna calibration factor storehouse respectively, former first digital pre-distortion coefficient storehouse and the first antenna calibration factor storehouse change to the second digital pre-distortion coefficient storehouse and the second antenna calibration coefficient storehouse organizes for storing next the digital pre-distortion coefficient and antenna calibration coefficient that upgrade.
Further, receive the calibrating sequence that initial magnitude-phase characteristics is known, the digital pre-distortion coefficient of described calibrating sequence when sending without current use carries out distortion computing, and send after being through the process being about to the digital pre-distortion coefficient distortion upgraded, after collecting antenna calibration sequence, digital pre-distortion coefficient still switches back old coefficient.
For solving the problems of the technologies described above, present invention also offers the system of a kind of digital pre-distortion and antenna calibration collaborative work, comprising: digital predistortion unit, antenna calibration unit and updating block;
Described digital predistortion unit comprises the first computing module and the first memory module, and the first computing module is used for carrying out digital pre-distortion coefficient calculations, and the first memory module is used for new digital pre-distortion coefficient storage in the second digital pre-distortion coefficient storehouse;
Described antenna calibration unit comprises the second computing module and the second memory module, second computing module is used for carrying out antenna calibration coefficient calculations according to antenna calibration sequence, and the second memory module is used for new antenna calibration coefficient storage in the second antenna calibration coefficient storehouse;
Described updating block is used for upgrading digital pre-distortion coefficients and antenna calibration coefficient simultaneously.
Further, described digital predistortion unit also comprises the first judge module, for using digital pre-distortion coefficient, pre-distortion is carried out to one group of sequence, calculate mean square error between the sequence after pre-distortion and target sequence, judge that whether this mean square error is more than the first pre-determined threshold, if do not exceeded, turn to the first memory module to store, otherwise return the first computing module.
Further, described antenna calibration unit also comprises the second judge module, for judging that whether described antenna calibration coefficient calculations obtains the signal to noise ratio of the antenna calibration sequence signal gathered more than the second pre-determined threshold, if exceeded, turn to the second memory module to store, otherwise turn to the 3rd judge module;
3rd judge module is used for calculating to antenna calibration the number of times unsuccessfully recurred and judges, if exceed preset times, resets, returns digital predistortion unit, otherwise turn to weighted calculation module, carry out coefficient weighted calculation.
Further, the smoothing process of digital pre-distortion coefficient that described weighted calculation module obtains before and after utilizing and upgrading, the smoothing factor C=a*C1+b*C2 obtained, and using smoothing factor as new digital pre-distortion coefficient, return digital predistortion unit, wherein C1 is for upgrading front digital pre-distortion coefficient, C2 is for upgrading rear digital pre-distortion coefficient, a, b are weight coefficient respectively, 0<a<1,0<b<1 and a+b=1.
Further, described first memory module comprises the first digital pre-distortion coefficient storehouse and the second digital pre-distortion coefficient storehouse, the digital pre-distortion coefficient before being respectively used to storage update and after upgrading;
Second memory module comprises the first antenna calibration factor storehouse and the second antenna calibration coefficient storehouse, the antenna calibration coefficient before being respectively used to storage update and after upgrading.
(3) beneficial effect
The invention provides a kind of method of digital pre-distortion and antenna calibration collaborative work, comprise: S1, carry out digital pre-distortion coefficient calculations, by new digital pre-distortion coefficient storage in the second digital pre-distortion coefficient storehouse, and trigger antenna calibration, when transmitting antenna calibrating sequence, the digital pre-distortion coefficient be stored in the second digital pre-distortion coefficient storehouse is used to carry out pre-distortion to calibrating sequence; S2, carry out antenna calibration coefficient calculations according to antenna calibration sequence, by new antenna calibration coefficient storage in the second antenna calibration coefficient storehouse; S3, digital pre-distortion coefficients storehouse and antenna calibration coefficient storehouse to be upgraded simultaneously, and return step S1.Carry out coefficient switching by the antenna calibration coefficient matched with the new digital pre-distortion coefficient that digital pre-distortion calculates simultaneously, the slitless connection of digital pre-distortion coefficient and antenna calibration coefficient can be realized, antenna calibration coefficient calculations lag issues can not be produced, avoid the change of the channel magnitude-phase characteristics caused due to the change of digital pre-distortion coefficient, also avoid the loss of antenna calibration compensation characteristic, realize the collaborative work of pre-numerical distortions and antenna calibration.Meanwhile, present invention also offers the system of a kind of digital pre-distortion corresponding with said method and antenna calibration collaborative work.
Accompanying drawing explanation
The flow chart of steps of the method for a kind of digital pre-distortion that Fig. 1 provides for the embodiment of the present invention one and antenna calibration collaborative work;
Signal flow graph when Fig. 2 is normal work in the embodiment of the present invention one;
Fig. 3 is signal flow graph when antenna calibration sequence sends in the embodiment of the present invention one;
Fig. 4 is the signal flow graph in the embodiment of the present invention one after digital pre-distortion and antenna calibration coefficient update;
The schematic diagram of the weighted calculation that Fig. 5 provides for the embodiment of the present invention one;
The flow chart of the optimum implementation that Fig. 6 provides for the embodiment of the present invention one;
The composition schematic diagram of the system of a kind of digital pre-distortion that Fig. 7 provides for the embodiment of the present invention two and antenna calibration collaborative work.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment one
The embodiment of the present invention one provides a kind of method of digital pre-distortion and antenna calibration collaborative work, and steps flow chart as shown in Figure 1, specifically comprises the following steps:
Step S1, carry out digital pre-distortion coefficient calculations, by new digital pre-distortion coefficient storage in the second digital pre-distortion coefficient storehouse, and trigger antenna calibration, when transmitting antenna calibrating sequence, the digital pre-distortion coefficient be stored in the second digital pre-distortion coefficient storehouse is used to carry out pre-distortion to calibrating sequence;
Step S2, carry out antenna calibration coefficient calculations according to antenna calibration sequence, by new antenna calibration coefficient storage in the second antenna calibration coefficient storehouse;
Step S3, digital pre-distortion coefficients storehouse and antenna calibration coefficient storehouse to be upgraded simultaneously, and return step S1.
Said method is by being stored in two storehouses respectively by digital pre-distortion coefficient and antenna calibration coefficient, first the calculating of digital pre-distortion coefficient is carried out, but in order to ensure with antenna calibration coefficient while upgrade, temporarily by new digital pre-distortion coefficient storage in the second digital pre-distortion coefficient storehouse, and trigger antenna calibration, the calculating of antenna calibration coefficient is carried out according to known antenna calibration sequence, after treating that antenna calibration calculates successfully, be stored in the second antenna calibration coefficient storehouse, upgrade digital pre-distortion coefficient and antenna calibration coefficient more afterwards simultaneously, thus the synchronism of antenna calibration coefficient and digital pre-distortion coefficient is ensured, the renewal avoided due to digital pre-distortion coefficient causes the change of channel magnitude-phase characteristics, cause the loss of antenna calibration compensation characteristic further, realize the slitless connection of digital pre-distortion coefficient and antenna calibration coefficient, the collaborative of both realizations does altogether.
Preferably, after in the present embodiment, step S1 carries out digital pre-distortion coefficient calculations, comprised before new digital pre-distortion coefficient storage is in the second digital pre-distortion coefficient storehouse:
Judge the whether success of digital pre-distortion coefficient calculations, if success, store, otherwise return and recalculate digital pre-distortion coefficient.
Concrete, the successful criterion of digital pre-distortion coefficient calculations uses digital pre-distortion coefficient to carry out pre-distortion to one group of sequence, calculate mean square error between the sequence after pre-distortion and target sequence, judge that whether this mean square error is more than the first pre-determined threshold, not calculating successfully more than being during the first pre-determined threshold, calculating unsuccessfully more than being during the first pre-determined threshold.
Preferably, after in the present embodiment, step S2 carries out antenna calibration coefficient calculations, also comprised before new antenna calibration coefficient storage is in the second antenna calibration coefficient storehouse:
Judge the whether success of described antenna calibration coefficient calculations, if success, store, otherwise the number of times unsuccessfully recurred is calculated to antenna calibration judge, if exceed preset times, reset, return step S1, otherwise carry out coefficient weighted calculation.
Concrete, the signal to noise ratio that antenna calibration coefficient calculations obtains the antenna calibration sequence signal gathered calculates successfully more than being during the second pre-determined threshold, do not calculate unsuccessfully more than being during the second pre-determined threshold, wherein the first pre-determined threshold and the second pre-determined threshold are all the empirical values obtained according to many experiments.
Concrete, coefficient weighted calculation specifically comprises:
Utilize the smoothing process of digital pre-distortion coefficient obtained before and after upgrading, the smoothing factor C=a*C1+b*C2 obtained, and using smoothing factor as new digital pre-distortion coefficient, return step S1, wherein C1 is for upgrading front digital pre-distortion coefficient, and C2 is digital pre-distortion coefficient after renewal, and a, b are weight coefficient respectively, 0<a<1,0<b<1 and a+b=1.
Wherein above-mentionedly be reset to warm reset, be specially and return to pass-through state and carry out antenna calibration process.If when antenna calibration calculates and unsuccessfully reaches preset times (namely certain threshold value) continuously, will the warm reset of triggered digital predistortion, return to Bypass pass-through state and carry out antenna calibration, to get rid of the failure causing antenna calibration to calculate because digital pre-distortion is abnormal.
Preferably, when digital pre-distortion coefficients storehouse and antenna calibration coefficient storehouse being upgraded simultaneously in the present embodiment, the second antenna calibration coefficient storehouse that the second digital pre-distortion coefficient storehouse and storage that store the digital pre-distortion coefficient being about to renewal are about to the antenna calibration coefficient upgraded is changed in the first digital pre-distortion coefficient storehouse and the first antenna calibration factor storehouse respectively, former first digital pre-distortion coefficient storehouse and the first antenna calibration factor storehouse change to the second digital pre-distortion coefficient storehouse and the second antenna calibration coefficient storehouse organizes for storing next the digital pre-distortion coefficient and antenna calibration coefficient that upgrade.
It should be noted that, no matter digital pre-distortion coefficient update realizes in look-up table mode or directly realizes with register coefficient configuration mode, all be designed to two digital pre-distortion coefficients storage stacks (Bank), a Bank is for storing Contemporary Digital pre-distortion coefficients, another Bank is next group digital pre-distortion coefficient, namely the digital pre-distortion coefficient after upgrading, by the switching between two Bank, realizes the switching between new coefficient and old coefficient; Antenna calibration coefficient is also designed to two antenna calibration coefficient storage storehouses (Bank), a Bank is current antenna calibration factor, another Bank is next group antenna calibration coefficient, by the switching between two Bank, realizes the switching between new coefficient and old coefficient equally.
When needs upgrade digital pre-distortion coefficient, first trigger an antenna calibration, one group of known calibrating sequence of magnitude-phase characteristics is sent by the system that is calibrated, this calibrating sequence carries out distortion computing without the digital pre-distortion coefficient of current use, and send after being through the process of next the group digital pre-distortion coefficient distortion being about to upgrade, after collecting antenna calibration sequence, digital pre-distortion coefficient still switches back old coefficient.Next group antenna calibration coefficient storage Bank is stored in by the calculated antenna calibration penalty coefficient of calibrating sequence collected.When after the penalty coefficient that predistortion and antenna calibration are all set new, by systematic unity, two parts are carried out to the switching of coefficient B ank, this ensure that the supporting of antenna calibration coefficient and pre-distortion coefficients, the change of channel magnitude-phase characteristics that more carefully causes avoided due to pre-distortion coefficients causes the loss of antenna calibration compensation characteristic.Fig. 2 is signal flow graph when normally working, and Fig. 3 is antenna calibration sequence signal flow graph when sending, and now the coefficient B ank of digital pre-distortion (Digital Pre-Distortion is called for short DPD) has been switched to the new coefficient B ank being about to upgrade.Fig. 4 is the signal flow graph after digital pre-distortion and antenna calibration (Antenna Calibration is called for short AC) coefficient update, and now digital pre-distortion and antenna calibration are switched to new coefficient B ank simultaneously.
In actual applications, digital pre-distortion and antenna calibration are all likely because a variety of causes causes the situation of coefficient computing failure to occur.For digital pre-distortion, if digital pre-distortion coefficient calculations is unsuccessful, then restart the coefficient calculations of a new round; For antenna calibration, as unsuccessful in antenna calibration coefficient Continuous plus, adopt digital pre-distortion coefficient and the antenna calibration coefficient update mechanism that links will stop the renewal of digital pre-distortion coefficient.For this situation, the reply of a kind of coping mechanism need be designed.As mentioned above, after antenna calibration, system channel magnitude-phase characteristics remains unchanged; Digital pre-distortion needs adaptively correcting mission nonlinear characteristic, when there is the situation of antenna calibration coefficient calculations failure, in order to prevent digital pre-distortion coefficient update from making channel characteristic undergo mutation, uses new and old digital pre-distortion coefficient to carry out coefficient ranking operation, namely
C=a*C1+b*C2(0<a<1,0<b<1, and a+b=1)
C1 is old coefficient, and C2 is new coefficient, and C is the smoothing factor obtained after computing.So both part have updated digital pre-distortion coefficient, the change of smooth passage magnitude-phase characteristics again.When the calculating of antenna calibration factor unsuccessfully exceedes the threshold value of certain predetermined continuously, as 3 times or 5 inferior, can the warm reset of triggered digital predistortion, revert to Bypass pass-through state and carry out antenna calibration process, to get rid of the failure causing antenna calibration to calculate because digital pre-distortion is abnormal; As in this case, antenna calibration calculates still failed, then answer the reason of other parts of Check System.The schematic diagram of above-mentioned weighted calculation as shown in Figure 5, its cathetus L1 represents the data using old coefficient computing, L2 represents the data using new coefficient calculations, can find out that phase place there occurs obvious deflection, L represents the data through the process of coefficient ranking operation, not only it can do part to data and upgrade but also level and smooth phase place deflection, the value of a and b can adjust according to actual conditions.
It should be noted that, the frequency of failure that above-mentioned antenna calibration calculates need set as the case may be, is described in the present embodiment for 3.
Below provide the concrete implementation step of a said method preferred plan, step performs figure as shown in Figure 6:
S101, carry out pre-distortion coefficients calculating, obtain pre-distortion coefficients to be updated.
S102, judge that pre-distortion coefficients calculates whether success, if success just by coefficient storage in coefficient storage Bank to be used, return S101 if unsuccessful.
S103, trigger antenna are calibrated, and calculate antenna calibration penalty coefficient, when transmitting antenna calibrating sequence, use the digital pre-distortion coefficient be stored in the second digital pre-distortion coefficient storehouse to carry out pre-distortion to calibrating sequence.
S104, judge that antenna calibration penalty coefficient calculates whether success, if success, perform S105, if unsuccessful, enter S106;
S105, coefficient storage is triggered predistortion and antenna calibration coefficient B ank and switches simultaneously and carry out coefficient update in coefficient storage Bank to be used, after return S101;
S106, judge antenna calibration penalty coefficient calculate whether calculates unsuccessfully continuous 3 times, if so, then execution step S107, if not, enter S108;
S107, warm reset is carried out to predistortion, after return S101;
S108, pre-distortion coefficients carried out a*C1+b*C2 calculate and just coefficient storage in coefficient storage Bank to be used, after carry out pre-distortion coefficients Bank switching, return S101.
Therefore, the method of a kind of digital pre-distortion that the embodiment of the present invention one proposes and antenna calibration collaborative work, each use two coefficient storage devices store digital pre-distortion coefficient and antenna calibration penalty coefficient, descending time slot is not taken during antenna calibration transmitting training sequence, therefore in advance digital pre-distortion coefficient can be switched to new coefficient, treat that the new coefficient calculations of antenna calibration is complete, common renewal digital pre-distortion and antenna calibration coefficient B ank.Digital pre-distortion and antenna calibration calculate and all likely occur the unsuccessful state of coefficient calculations.For digital pre-distortion, coefficient calculations is unsuccessful, then restart the coefficient calculations of a new round; For antenna calibration, as unsuccessful in coefficient Continuous plus, adopt digital pre-distortion coefficient and the antenna calibration penalty coefficient update mechanism that links will stop the renewal of digital pre-distortion coefficient, in order to address this problem, method provided by the invention can when running into this kind of situation, digital pre-distortion coefficient upgrades after utilizing old coefficient and new coefficient to carry out a+b computing, such smoothed channel width phase change fluctuation, avoid width to suddenly change mutually, and then avoid the change of the channel magnitude-phase characteristics caused due to the change of digital pre-distortion coefficient.
Embodiment two
The embodiment of the present invention two additionally provides the system of a kind of digital pre-distortion and antenna calibration collaborative work, and composition schematic diagram as shown in Figure 7, specifically comprises: digital predistortion unit 10, antenna calibration unit 20 and updating block 30;
Digital predistortion unit 10 comprises the first computing module 11 and the first memory module 12, first computing module 11 for carrying out digital pre-distortion coefficient calculations, the first memory module 12 for by new digital pre-distortion coefficient storage in the second digital pre-distortion coefficient storehouse 122;
Antenna calibration unit 20 comprises the second computing module 21 and the second memory module 22, second computing module 21 for carrying out antenna calibration coefficient calculations according to antenna calibration sequence, the second memory module 22 for by new antenna calibration coefficient storage in the second antenna calibration coefficient storehouse 222;
Updating block 30 is for upgrading digital pre-distortion coefficients and antenna calibration coefficient simultaneously.
Preferably, the digital predistortion unit 10 in the present embodiment also comprises the first judge module 13, for judging that whether digital pre-distortion coefficient calculations is successful, if success, turning to the first memory module 12 to store, otherwise returning the first computing module 11.
Preferably, the antenna calibration unit 20 in the present embodiment also comprises the second judge module 23, for judging that whether antenna calibration coefficient calculations is successful, if success, turning to the second memory module 22 to store, otherwise turning to the 3rd judge module 24;
3rd judge module 24 judges for calculating the number of times unsuccessfully recurred to antenna calibration, if exceed preset times, resets, returns digital predistortion unit 10, otherwise turn to weighted calculation module 25, carry out coefficient weighted calculation.
Preferably, the smoothing process of digital pre-distortion coefficient that weighted calculation module 25 in the present embodiment obtains before and after utilizing and upgrading, the smoothing factor C=a*C1+b*C2 obtained, and using smoothing factor as new digital pre-distortion coefficient, return digital predistortion unit 10, wherein C1 is for upgrading front digital pre-distortion coefficient, C2 is for upgrading rear digital pre-distortion coefficient, a, b are weight coefficient respectively, 0<a<1,0<b<1 and a+b=1.
Preferably, the first memory module 12 in the present embodiment comprises the first digital pre-distortion coefficient storehouse DPD Bank1 and the second digital pre-distortion coefficient storehouse DPD Bank2, is respectively used to store the digital pre-distortion coefficient using and be about to upgrade;
Second memory module 22 comprises the first antenna calibration factor storehouse AC Bank1 and the second antenna calibration coefficient storehouse AC Bank2, is respectively used to store the antenna calibration coefficient using and be about to upgrade.
System in the present embodiment also can realize the technique effect identical with above-described embodiment one, and number of times repeats no more.
Above execution mode is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (12)
1. a method for digital pre-distortion and antenna calibration collaborative work, is characterized in that, comprising:
S1, carry out digital pre-distortion coefficient calculations, by new digital pre-distortion coefficient storage in the second digital pre-distortion coefficient storehouse, and trigger antenna calibration, when transmitting antenna calibrating sequence, the digital pre-distortion coefficient be stored in the second digital pre-distortion coefficient storehouse is used to carry out pre-distortion to calibrating sequence;
S2, carry out antenna calibration coefficient calculations according to antenna calibration sequence, by new antenna calibration coefficient storage in the second antenna calibration coefficient storehouse;
S3, digital pre-distortion coefficients storehouse and antenna calibration coefficient storehouse to be upgraded simultaneously, and return step S1.
2. the method for claim 1, is characterized in that, after step S1 carries out digital pre-distortion coefficient calculations, also comprises before new digital pre-distortion coefficient storage is in the second digital pre-distortion coefficient storehouse:
Described new digital pre-distortion coefficient is used to carry out pre-distortion to one group of sequence, calculate the mean square error between the sequence after pre-distortion and target sequence, judge that whether described mean square error is more than the first pre-determined threshold, if do not exceeded, store, otherwise return and recalculate digital pre-distortion coefficient.
3. the method for claim 1, is characterized in that, after step S2 carries out antenna calibration coefficient calculations, also comprises before new antenna calibration coefficient storage is in the second antenna calibration coefficient storehouse:
Judge that whether described antenna calibration coefficient calculations obtains the signal to noise ratio of the antenna calibration sequence signal gathered more than the second pre-determined threshold, if exceeded, store, otherwise calculate to antenna calibration the number of times unsuccessfully recurred to judge, if exceed preset times, reset, return step S1, otherwise carry out coefficient weighted calculation.
4. method as claimed in claim 3, it is characterized in that, described coefficient weighted calculation specifically comprises:
Utilize the smoothing process of digital pre-distortion coefficient obtained before and after upgrading, the smoothing factor C=a*C1+b*C2 obtained, and using smoothing factor as new digital pre-distortion coefficient, return step S1, wherein C1 is for upgrading front digital pre-distortion coefficient, and C2 is digital pre-distortion coefficient after renewal, and a, b are weight coefficient respectively, 0<a<1,0<b<1 and a+b=1.
5. method as claimed in claim 3, is characterized in that, described in be reset to warm reset, be specially and return to pass-through state and carry out antenna calibration process.
6. the method for claim 1, it is characterized in that, when digital pre-distortion coefficients storehouse and antenna calibration coefficient storehouse are upgraded simultaneously, the second antenna calibration coefficient storehouse that the second digital pre-distortion coefficient storehouse and storage that store the digital pre-distortion coefficient being about to renewal are about to the antenna calibration coefficient upgraded is changed in the first digital pre-distortion coefficient storehouse and the first antenna calibration factor storehouse respectively, former first digital pre-distortion coefficient storehouse and the first antenna calibration factor storehouse change to the second digital pre-distortion coefficient storehouse and the second antenna calibration coefficient storehouse organizes new digital pre-distortion coefficient and antenna calibration coefficient for storing next.
7. the method for claim 1, it is characterized in that, receive the calibrating sequence that initial magnitude-phase characteristics is known, the digital pre-distortion coefficient of described calibrating sequence when sending without current use carries out distortion computing, and send after being through the process being about to the digital pre-distortion coefficient distortion upgraded, after collecting antenna calibration sequence, digital pre-distortion coefficient still switches back old coefficient.
8. a system for digital pre-distortion and antenna calibration collaborative work, is characterized in that, comprising: digital predistortion unit, antenna calibration unit and updating block;
Described digital predistortion unit comprises the first computing module and the first memory module, and the first computing module is used for carrying out digital pre-distortion coefficient calculations, and the first memory module is used for new digital pre-distortion coefficient storage in the second digital pre-distortion coefficient storehouse;
Described antenna calibration unit comprises the second computing module and the second memory module, second computing module is used for carrying out antenna calibration coefficient calculations according to antenna calibration sequence, and the second memory module is used for new antenna calibration coefficient storage in the second antenna calibration coefficient storehouse;
Described updating block is used for upgrading digital pre-distortion coefficients and antenna calibration coefficient simultaneously.
9. system as claimed in claim 8, it is characterized in that, described digital predistortion unit also comprises the first judge module, for using digital pre-distortion coefficient, pre-distortion is carried out to one group of sequence, calculate mean square error between the sequence after pre-distortion and target sequence, judge that whether this mean square error is more than the first pre-determined threshold, if do not exceeded, turn to the first memory module to store, otherwise return the first computing module.
10. system as claimed in claim 8, it is characterized in that, described antenna calibration unit also comprises the second judge module, for judging that whether described antenna calibration coefficient calculations obtains the signal to noise ratio of the antenna calibration sequence signal gathered more than the second pre-determined threshold, if exceeded, turn to the second memory module to store, otherwise turn to the 3rd judge module;
3rd judge module is used for calculating to antenna calibration the number of times unsuccessfully recurred and judges, if exceed preset times, resets, returns digital predistortion unit, otherwise turn to weighted calculation module, carry out coefficient weighted calculation.
11. systems as claimed in claim 10, it is characterized in that, the smoothing process of digital pre-distortion coefficient that described weighted calculation module obtains before and after utilizing and upgrading, the smoothing factor C=a*C1+b*C2 obtained, and using smoothing factor as new digital pre-distortion coefficient, return digital predistortion unit, wherein C1 is for upgrading front digital pre-distortion coefficient, C2 is for upgrading rear digital pre-distortion coefficient, a, b are weight coefficient respectively, 0<a<1,0<b<1 and a+b=1.
12. systems as claimed in claim 8, is characterized in that, described first memory module comprises the first digital pre-distortion coefficient storehouse and the second digital pre-distortion coefficient storehouse, are respectively used to store the current digital pre-distortion coefficient using and be about to renewal;
Second memory module comprises the first antenna calibration factor storehouse and the second antenna calibration coefficient storehouse, is respectively used to store the current antenna calibration coefficient using and be about to renewal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410049123.4A CN104836627B (en) | 2014-02-12 | 2014-02-12 | The method and system that a kind of digital pre-distortion cooperates with antenna calibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410049123.4A CN104836627B (en) | 2014-02-12 | 2014-02-12 | The method and system that a kind of digital pre-distortion cooperates with antenna calibration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104836627A true CN104836627A (en) | 2015-08-12 |
| CN104836627B CN104836627B (en) | 2017-07-18 |
Family
ID=53814289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410049123.4A Expired - Fee Related CN104836627B (en) | 2014-02-12 | 2014-02-12 | The method and system that a kind of digital pre-distortion cooperates with antenna calibration |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104836627B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108632183A (en) * | 2017-03-22 | 2018-10-09 | 大唐移动通信设备有限公司 | A kind of digital pre-distortion processing method and device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010008968A1 (en) * | 2008-07-14 | 2010-01-21 | Motorola, Inc. | Digital predistortion in a multi transceiver system provided with a smart antenna array |
| CN102006091A (en) * | 2009-08-31 | 2011-04-06 | 摩托罗拉公司 | Scalable self-calibrating and configuring radio frequency head for a wireless communication system |
| CN102035076A (en) * | 2009-09-29 | 2011-04-27 | 大唐移动通信设备有限公司 | Antenna calibration system and method |
| CN102158265A (en) * | 2010-08-25 | 2011-08-17 | 华为技术有限公司 | Multi-antenna system and method for multiplexing feedback signal receiving link thereof |
| US8462881B2 (en) * | 2008-12-31 | 2013-06-11 | Ubidyne, Inc. | Method for digitally predistorting a payload signal and radio station incorporating the method |
-
2014
- 2014-02-12 CN CN201410049123.4A patent/CN104836627B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010008968A1 (en) * | 2008-07-14 | 2010-01-21 | Motorola, Inc. | Digital predistortion in a multi transceiver system provided with a smart antenna array |
| US8462881B2 (en) * | 2008-12-31 | 2013-06-11 | Ubidyne, Inc. | Method for digitally predistorting a payload signal and radio station incorporating the method |
| CN102006091A (en) * | 2009-08-31 | 2011-04-06 | 摩托罗拉公司 | Scalable self-calibrating and configuring radio frequency head for a wireless communication system |
| CN102035076A (en) * | 2009-09-29 | 2011-04-27 | 大唐移动通信设备有限公司 | Antenna calibration system and method |
| CN102158265A (en) * | 2010-08-25 | 2011-08-17 | 华为技术有限公司 | Multi-antenna system and method for multiplexing feedback signal receiving link thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108632183A (en) * | 2017-03-22 | 2018-10-09 | 大唐移动通信设备有限公司 | A kind of digital pre-distortion processing method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104836627B (en) | 2017-07-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103973248B (en) | Nonlinear Function Adjustment Method, Envelope Tracking System and Mobile Communication Equipment | |
| CN101330481B (en) | Predistortion model apparatus as well as apparatus, system and method for processing predistortion of signal | |
| EP3267579B1 (en) | Linearizing power amplifiers outputs in multi-antenna system | |
| US20140301503A1 (en) | Multi-cell processing architectures for modeling and impairment compensation in multi-input multi-output systems | |
| EP3311484B1 (en) | Least mean squares adaptation of a concurrent multi-band pre-distorter using overlapping spines | |
| EP2820762A1 (en) | Fir/iir filter predistorter for power amplifiers exhibiting short-term and/or long-term memory effects | |
| US11476809B2 (en) | Polyphase digital signal predistortion in radio transmitter | |
| JP2022529797A (en) | Signal distortion pre-correction method, equipment, system and complex system | |
| WO2012066383A1 (en) | Orthogonal basis function set for ditigal predistorter | |
| JP2009177668A (en) | Distortion compensating apparatus and power amplifier with the same | |
| CN102369664B (en) | A radio system and a method for relaying radio signals | |
| DE10392496T5 (en) | Adaptive digital predistortion due to an amplifier model with frequency-dependent nonlinearities | |
| US11575398B2 (en) | Antenna controller for antenna with linearized power amplifiers | |
| CN102143108A (en) | Improved self-adaption predistortion technology | |
| EP3939176A1 (en) | Per-branch, combined, and grouped combined mimo dpd | |
| US9444412B2 (en) | Distortion compensation apparatus and method therefor | |
| JP2015026968A (en) | Distortion compensation device and distortion compensation method | |
| CN105763503A (en) | Digital pre-distortion processing method and apparatus | |
| CN104836627A (en) | Method for cooperative work between digital predistortion and antenna calibration, and system | |
| US20100148865A1 (en) | Method and system for calculating the pre-inverse of a nonlinear system | |
| US8811532B2 (en) | Architecture and the training method of a PA DPD system with space mapping applied in the predistorter | |
| US20130243117A1 (en) | Apparatus and method for a flexible digital predistortion architecture for coarse-to-fine compensation | |
| US8902962B2 (en) | Method and device for compensating frequency response of a filter unit in remote radio unit in real time | |
| EP3607710A1 (en) | Low complexity mimo digital pre-distortion | |
| CN103888395B (en) | Digital pre-distortion method and digital pre-distortion device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| EXSB | Decision made by sipo to initiate substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170718 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |