CN106330802A - Digital pre-distortion processing apparatus and method of mobile communication system - Google Patents
Digital pre-distortion processing apparatus and method of mobile communication system Download PDFInfo
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Abstract
The present invention provides a digital pre-distortion processing apparatus and method of a mobile communication system. The apparatus comprises a pre-distortion processor, a plurality of transceiver antennas, and a plurality of uplink transmission links connected between the pre-distortion processor and the plurality of transceiver antennas. The apparatus further comprises a feedback link connected between an output end of each transmission link and the pre-distortion processor. The pre-distortion processor is used for storing and updating a pre-distortion coefficient table, acquiring a mean amplitude of baseband digital signals of all carrier signals of a current timeslot, calculating according to the mean amplitude of baseband digital signals of all carrier signals of the current timeslot so as to obtain a digital pre-distortion (DPD) input amplitude mean value of the current timeslot, selecting a corresponding pre-distortion coefficient from the pre-distortion coefficient table according to the DPD input amplitude mean value of the current timeslot so as to perform pre-distortion processing on the received baseband digital signals of the current timeslot, and generating and outputting a pre-distortion baseband digital signal. The apparatus has the beneficial effect of lowering the system cost and the system design complexity.
Description
Technical field
The present invention relates to distortion measurement is carried out the technical field of digital pre-distortion process, especially relate to digital predistortion process apparatus and the method for a kind of mobile communication system.
Background technology
DPD (Digital Pre-Distortion, digital pre-distortion) technology is to solve a technology of the non-linear distortion of distortion measurement in communication system, the communication system of DPD technology is generally used to be provided with special DPD processing module, for extracting the output signal of distortion measurement, the non-linear distortion of described distortion measurement is calculated according to described output signal after processing, the most in advance the baseband signal inputting described distortion measurement is made nonlinear distortion compensation, described nonlinear distortion compensation value is complementary with the non-linear distortion of described distortion measurement, so that the non-linear distortion of the output signal of described distortion measurement reduces.Along with the development of multi-antenna communications technology, the application in multiple antenna communication of the DPD technology is more and more extensive.
The most in multi-antenna systems, for improving system linearity degree, generally multiaerial system is regarded as multiple independent a single aerial system, respectively each antenna system ground distortion measurement is carried out linearization process, the multiaerial system of corresponding N root antenna is necessary for the digital pre-distortion that N set is the most independent, the most not only considerably increase the cost of total system, and considerably increase the complexity of system design.
Summary of the invention
In view of this, present invention solves the technical problem that digital predistortion process apparatus and the method being to provide mobile communication system, to reduce system cost and the complexity of system design.
The technical scheme is that the digital predistortion process apparatus of a kind of mobile communication system, including predistortion processor, a plurality of dual-mode antenna be connected to a plurality of up transmission link between predistortion processor and a plurality of dual-mode antenna,
Described up transmission link includes D/A modular converter, wave filter, upconverter and the power amplifier being sequentially connected with；
Also including being connected to described in each bar a feedback link between transmitting chain outfan and described predistortion processor, feedback link, according to the digital intermediate frequency feedback signal received, carries out the calculating of pre-distortion coefficients, and sends result of calculation to predistortion processor；
Described predistortion processor is used for preserving and update pre-distortion coefficients table, obtain the mean amplitude of the baseband digital signal of each carrier signal of current time slots, the mean amplitude of the baseband digital signal according to each carrier signal of described current time slots, it is calculated the DPD input range average of current time slots, DPD input range average according to described current time slots is chosen the baseband digital signal of the pre-distortion coefficients of the correspondence current time slots to being received from pre-distortion coefficients table and is carried out pre-distortion, generates the output of predistortion baseband digital signal.
Further, described predistortion processor includes:
Time slot amplitude equalizing value computing module, for receiving the mean amplitude of the baseband digital signal of each carrier signal, the mean amplitude of the baseband digital signal according to each carrier signal received, it is calculated the DPD input range average of current time slots, the DPD input range average of described current time slots is exported and searches module to pre-distortion coefficients；
Pre-distortion coefficients searches module, for preserving and updating pre-distortion coefficients table, DPD input range average according to the current time slots from time slot amplitude equalizing value calculating sub module, from pre-distortion coefficients table, choose the pre-distortion coefficients of correspondence, selected pre-distortion coefficients is supplied to DPD forward direction processing module；
DPD forward direction processing module, for utilizing the pre-distortion coefficients searching module from pre-distortion coefficients, carries out pre-distortion to the baseband digital signal of the current time slots received, generates the output of predistortion baseband digital signal.
Further, described feedback link includes multiway analog switch, down conversion module, filtration module, A/D modular converter and the feedback power computing module being sequentially connected with；
Described multiway analog switch connects the outfan of the power amplifier on transmitting chain described in each bar respectively, for alternatively gating the outfan of each described power amplifier, and the radio signal transmission that described power amplifier is exported to described down conversion module；
Described down conversion module is for being converted into intermediate-freuqncy signal by the radiofrequency signal of reception；
Described filtration module is for carrying out frequency-selective filtering to described intermediate-freuqncy signal；
Described A/D modular converter, for sampling filtered described intermediate-freuqncy signal, is sent to described feedback distortion computing module after described intermediate-freuqncy signal is converted to the feedback signal of digital baseband form.
Further, described pre-distortion coefficients lookup module includes:
Pre-distortion coefficients memory element, is used for preserving and update pre-distortion coefficients table；
Control unit, for receiving the DPD input range average of the current time slots from time slot amplitude equalizing value computing module, DPD input range average according to described current time slots, pre-distortion coefficients chosen by pre-distortion coefficients table from pre-distortion coefficients memory element, selected pre-distortion coefficients is supplied to DPD forward direction processing module.
A kind of digital pre-distortion processing method of mobile communication system, including:
The feedback signal of each antenna is respectively fed to each signal input part of multiway analog switch；
During initialization, by switching multiway analog switch, the feedback signal of acquiescence being exported feedback link, feedback link, according to the digital intermediate frequency feedback signal received, carries out the calculating of pre-distortion coefficients, and sends result of calculation to predistortion processor；
Predistortion processor obtains the mean amplitude of the baseband digital signal of each carrier signal of current time slots；
The mean amplitude of the baseband digital signal according to each carrier signal of described current time slots, is calculated the DPD input range average of current time slots；
Described pre-distortion coefficients is searched module and is received the pre-distortion coefficients from feedback link and DPD input range average, utilizes described pre-distortion coefficients to be updated pre-distortion coefficients corresponding with described DPD input range average in pre-distortion coefficients table；
The baseband digital signal of the pre-distortion coefficients chosen described in the utilization of the DPD forward direction processing module current time slots to being received carries out pre-distortion, generates the output of predistortion baseband digital signal.
Judge whether to need to switch feedback signal；
When needs switching feedback signal, by switching multiway analog switch, the feedback signal switching needed is exported to feedback link.
Farther include: receiving the baseband digital signal of each carrier signal of current time slots, the mean amplitude of the baseband digital signal of carrier signal each to described current time slots calculates, and obtains the mean amplitude of the baseband digital signal of each carrier signal.
Further, the mean amplitude of the baseband digital signal of described carrier signal each to current time slots is calculated as: the baseband digital signal of carrier signal each to current time slots, the amplitude of the adjacent N point of the current time slots of the baseband digital signal of this carrier signal is added averaged, obtains the mean amplitude of the baseband digital signal of this carrier signal.
Further, the mean amplitude of the described baseband digital signal according to each carrier signal of current time slots, the DPD input range average being calculated current time slots is: the mean amplitude of the baseband digital signal of carrier signal each to described current time slots calculates quadratic sum, the quadratic sum calculated is opened quadratic power computing, obtains the DPD input range average of current time slots；
Or it is: utilize the yield value of the baseband digital signal of predetermined each carrier signal, the baseband digital signal of carrier signal each to current time slots carries out gain calculating, the mean amplitude of the described baseband digital signal carrying out each carrier signal of current time slots after gain calculating is calculated quadratic sum, the quadratic sum calculated is opened quadratic power computing, obtains the DPD input range average of current time slots.
Further, described in carry out pre-distortion coefficients calculating before, farther include: receive the DPD input range average of described current time slots；
Pre-distortion coefficients that described utilization is calculated update pre-distortion coefficients table by: utilize the pre-distortion coefficients calculated that pre-distortion coefficients corresponding with described DPD input range average in pre-distortion coefficients table is updated.
The present invention has the advantage that with good effect: can be seen that from such scheme, predistortion processor in the present invention is by obtaining the mean amplitude of the baseband digital signal of each carrier wave of carrier signal current time slots, calculate the DPD input range average of current time slots, from pre-distortion coefficients table, choose the pre-distortion coefficients of correspondence with the DPD input range average according to current time slots.Thus the time difference utilizing the baseband digital signal of the digital modulation unit current time slots to being received to process, complete choosing of pre-distortion coefficients, improve the efficiency that data send.
In addition, the present invention carries out in units of time slot pre-distortion, take into full account chugging situation possible between different time-gap, example according to, in some system, the power between different time-gap may differ by more than ten several decibels (dB), when therefore processing in units of time slot, between time slot, the sudden change of power will not influence each other so that more accurate to choosing of the pre-distortion coefficients of current time slots baseband digital signal.
Simultaneously, due in the digital pre-distortion processing method of a kind of mobile communication system of the present invention, the feedback signal utilizing the feedback channel of the digital predistortion process apparatus of described dynamic communication system calculates described feedback pre-distortion coefficients, adjusting DPD feedback module without additionally arranging special distortion, the cost realized because of the method is relatively low.
Accompanying drawing explanation
Fig. 1 is the structural representation of the digital predistortion process apparatus of mobile communication system of the present invention；
Fig. 2 is the preferred implementation schematic diagram of the digital predistortion process apparatus of mobile communication system of the present invention；
Fig. 3 be the digital predistortion process apparatus of mobile communication system of the present invention device in pre-distortion coefficients search module internal structure schematic diagram；
Fig. 4 is the schematic flow sheet of the digital pre-distortion processing method of mobile communication system of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is elaborated.
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.
Fig. 1 is a structural representation of the digital predistortion process apparatus of dynamic communication system in the embodiment of the present invention.According to Fig. 1, this device includes: the digital predistortion process apparatus of a kind of mobile communication system, including predistortion processor, a plurality of dual-mode antenna be connected to a plurality of up transmission link between predistortion processor and a plurality of dual-mode antenna,
Described up transmission link includes D/A modular converter, wave filter, upconverter and the power amplifier being sequentially connected with；
Also including being connected to described in each bar a feedback link between transmitting chain outfan and described predistortion processor, feedback link, according to the digital intermediate frequency feedback signal received, carries out the calculating of pre-distortion coefficients, and sends result of calculation to predistortion processor；
Described predistortion processor is used for preserving and update pre-distortion coefficients table, obtain the mean amplitude of the baseband digital signal of each carrier signal of current time slots, the mean amplitude of the baseband digital signal according to each carrier signal of described current time slots, it is calculated the DPD input range average of current time slots, DPD input range average according to described current time slots is chosen the baseband digital signal of the pre-distortion coefficients of the correspondence current time slots to being received from pre-distortion coefficients table and is carried out pre-distortion, generates the output of predistortion baseband digital signal.
The D/A modular converter sent in link is converted to analogue signal and sends wave filter to digital signal, wave filter carries out frequency-selective filtering to described intermediate-freuqncy signal, up-converter module is used for receiving intermediate frequency signal and converts thereof into the radiofrequency signal of transmission, and power amplifier radiofrequency signal is transmitted after carrying out power prosperity.
Feedback link, for according to sending the signal that link exports, generates the output of digital intermediate frequency feedback signal.
Predistortion processor, according to the digital intermediate frequency feedback signal from feedback unit and the baseband digital signal from predistortion processor, carries out the calculating of pre-distortion coefficients, predistortion processor be updated pre-distortion coefficients table.
In said apparatus, when predistortion processor implements, can according to shown in Fig. 2, including: time slot amplitude equalizing value computing module, pre-distortion coefficients search module and DPD forward direction processing module.
Wherein, base band mean amplitude measurement module is for receiving the baseband digital signal of each carrier wave of current time slots, the mean amplitude of the baseband digital signal of carrier wave each to described current time slots calculates, and exports the mean amplitude of the baseband digital signal of calculated each carrier wave to time slot amplitude equalizing value computing module.Wherein, the mean amplitude of the baseband digital signal calculating each carrier wave may is that the baseband digital signal of carrier wave each to current time slots, the amplitude of the adjacent N point of the current time slots of the baseband digital signal of this carrier wave is added averaged, obtains the mean amplitude of the baseband digital signal of this carrier wave.
Time slot amplitude equalizing value computing module is for the mean amplitude of the baseband digital signal according to each carrier wave from base band mean amplitude measurement module, it is calculated the DPD input range average of current time slots, the DPD input range average of described current time slots is exported and searches module to pre-distortion coefficients.Wherein, the method of the DPD input range average calculating current time slots may is that the mean amplitude of the baseband digital signal of carrier wave each to described current time slots calculates quadratic sum, the quadratic sum calculated is opened quadratic power computing, obtains the DPD input range average of current time slots；Or may is that the yield value of the baseband digital signal utilizing predetermined each carrier wave, the baseband digital signal of carrier wave each to current time slots carries out gain calculating, the mean amplitude of the described baseband digital signal carrying out each carrier wave of current time slots after gain calculating is calculated quadratic sum, the quadratic sum calculated is opened quadratic power computing, obtains the DPD input range average of current time slots.Example according to: assuming total N number of carrier wave, the yield value of the baseband digital signal of the most predetermined each carrier wave can be designated as G (f for gain determined by the treatment characteristic according to digital modulation unitn), the mean amplitude of the baseband digital signal of each carrier wave of current time slots is designated as AIQ_baseband(fn), wherein, n=0,1 ..., N-1, then DPD input range average A of current time slotsDPD_inputFor: ADPD_input=Σ n=0N-1 | AIQ_baseband (fn) ·G(fn)|2.]]>
Pre-distortion coefficients is searched module and is used for preserving and update pre-distortion coefficients table, DPD input range average according to the current time slots from time slot amplitude equalizing value calculating sub module, from pre-distortion coefficients table, choose the pre-distortion coefficients of correspondence, selected pre-distortion coefficients is supplied to DPD forward direction processing module.Wherein, pre-distortion coefficients searches the mapping relations being previously stored with pre-distortion coefficients and the DPD input range average of current time slots in module, therefore according to the DPD input range average of current time slots and the mapping relations with pre-distortion coefficients thereof, from pre-distortion coefficients table, the pre-distortion coefficients of correspondence is chosen.
DPD forward direction processing module searches the pre-distortion coefficients of module for utilizing from pre-distortion coefficients, and the baseband digital signal of the current time slots received is carried out pre-distortion, generates the output of predistortion baseband digital signal.
Fig. 3 shows that in Fig. 1 and Fig. 2 shown device, pre-distortion coefficients searches a kind of internal structure schematic diagram when module implements, and according to Fig. 3, pre-distortion coefficients is searched module and comprised the steps that pre-distortion coefficients memory element and control unit.
Wherein, pre-distortion coefficients memory element, it is used for preserving and update pre-distortion coefficients table.
Control unit, for receiving the DPD input range average of the current time slots from time slot amplitude equalizing value computing module, DPD input range average according to described current time slots, pre-distortion coefficients table from pre-distortion coefficients memory element is chosen the pre-distortion coefficients of correspondence, selected pre-distortion coefficients is supplied to DPD forward direction processing module.
Pre-distortion coefficients memory element receives the pre-distortion coefficients from feedback link and DPD input range average, utilizes pre-distortion coefficients to be updated pre-distortion coefficients corresponding with DPD input range average in pre-distortion coefficients table.
Wherein, control unit can also be searched module from pre-distortion coefficients and be separated, and integrates with time slot amplitude equalizing value computing module, constitutes time slot amplitude equalizing value and calculates and control module, correspondingly, pre-distortion coefficients lookup module becomes pre-distortion coefficients memory module.
In pre-distortion coefficients memory module, storage has the mapping relations of pre-distortion coefficients and the DPD input range average of current time slots, therefore according to the DPD input range average of current time slots and the mapping relations with pre-distortion coefficients thereof, from pre-distortion coefficients table, pre-distortion coefficients is chosen.
Pre-distortion coefficients memory module receives the pre-distortion coefficients from feedback link and DPD input range average, utilizes described pre-distortion coefficients to be updated pre-distortion coefficients corresponding with described DPD input range average in pre-distortion coefficients table.
Wherein, calculate the method for DPD input range average of current time slots equally: the mean amplitude of the baseband digital signal of carrier wave each to described current time slots calculates quadratic sum, the quadratic sum calculated is opened quadratic power computing, obtains the DPD input range average of current time slots；Or may is that the yield value of the baseband digital signal utilizing predetermined each carrier wave, the baseband digital signal of carrier wave each to current time slots carries out gain calculating, the mean amplitude of the described baseband digital signal carrying out each carrier wave of current time slots after gain calculating is calculated quadratic sum, the quadratic sum calculated is opened quadratic power computing, obtains the DPD input range average of current time slots.
Can arrange base-band digital IF interface between each antenna carrier signal and predistortion processor, this interface can be that single physical interface realizes, it is also possible to for User Defined interface, or the interface set based on standard agreement.Example is according to general common wireless interface (CPRI, Common Public Radio Interface), or disclosed base station architecture interface (OBSAI, Open Base Station Architecture Initiative) etc..
Above digital predistortion process apparatus to mobile communication system in the embodiment of the present invention is described in detail, has been described in detail the embodiment of the present invention carries out digital pre-distortion processing method to baseband signal the most again.
Fig. 4 shows the exemplary process diagram that baseband signal carries out in the embodiment of the present invention digital pre-distortion processing method.According to Fig. 4, this flow process includes:
The feedback signal of each antenna is respectively fed to each signal input part of multiway analog switch；
During initialization, by switching multiway analog switch, the feedback signal of acquiescence being exported feedback link, feedback link, according to the digital intermediate frequency feedback signal received, carries out the calculating of pre-distortion coefficients, and sends result of calculation to predistortion processor；
Predistortion processor obtains the mean amplitude of the baseband digital signal of each carrier signal of current time slots；
The mean amplitude of the baseband digital signal according to each carrier signal of described current time slots, is calculated the DPD input range average of current time slots；
Described pre-distortion coefficients is searched module and is received the pre-distortion coefficients from feedback link and DPD input range average, utilizes described pre-distortion coefficients to be updated pre-distortion coefficients corresponding with described DPD input range average in pre-distortion coefficients table；
The baseband digital signal of the pre-distortion coefficients chosen described in the utilization of the DPD forward direction processing module current time slots to being received carries out pre-distortion, generates the output of predistortion baseband digital signal.
Judge whether to need to switch feedback signal；
When needs switching feedback signal, by switching multiway analog switch, the feedback signal switching needed is exported to feedback link.
In this step, the method of the DPD input range average calculating current time slots may is that the mean amplitude of the baseband digital signal of carrier wave each to described current time slots calculates quadratic sum, the quadratic sum calculated is opened quadratic power computing, obtains the DPD input range average of current time slots；Or may is that the yield value of the baseband digital signal utilizing predetermined each carrier wave, the baseband digital signal of carrier wave each to current time slots carries out gain calculating, the mean amplitude of the described baseband digital signal carrying out each carrier wave of current time slots after gain calculating is calculated quadratic sum, the quadratic sum calculated is opened quadratic power computing, obtains the DPD input range average of current time slots.
Example according to: assuming total N number of carrier wave, the yield value of the baseband digital signal of the most predetermined each carrier wave can be designated as G (f for gain determined by the treatment characteristic according to digital modulation unitn), the mean amplitude of the baseband digital signal of each carrier wave of current time slots is designated as AIQ_baseband(fn), wherein, n=0,1 ..., N-1, then DPD input range average A of current time slotsDPD_inputFor: ADPD_input=Σ n=0N-1 | AIQ_baseband (fn) ·G(fn)|2.]]>
DPD input range average according to current time slots chooses the pre-distortion coefficients of correspondence from the pre-distortion coefficients table stored.
In the present embodiment, it is previously stored with the mapping relations of pre-distortion coefficients and the DPD input range average of current time slots, therefore according to the DPD input range average of current time slots and the mapping relations with pre-distortion coefficients thereof, from the pre-distortion coefficients table stored, the pre-distortion coefficients of correspondence is chosen.
The baseband digital signal of the current time slots to being received of the pre-distortion coefficients selected by utilization carries out pre-distortion, generates the output of predistortion baseband digital signal.
Additionally, this method farther includes: according to predistortion baseband digital signal and the digital intermediate frequency feedback signal that obtained by predistortion baseband digital signal, carry out the calculating of pre-distortion coefficients, utilize the pre-distortion coefficients calculated generate or update pre-distortion coefficients table.
And, further, the DPD input range average of current time slots can be received, and after receiving the DPD input range average of current time slots, according to predistortion baseband digital signal and the digital intermediate frequency feedback signal that obtained by predistortion baseband digital signal, carry out the calculating of pre-distortion coefficients, afterwards, utilize the pre-distortion coefficients calculated that pre-distortion coefficients corresponding with received DPD input range average in pre-distortion coefficients table is updated.
Above one embodiment of the present of invention is described in detail, but described content has been only presently preferred embodiments of the present invention, it is impossible to be considered the practical range for limiting the present invention.All impartial changes made according to the present patent application scope and improvement etc., within all should still belonging to the patent covering scope of the present invention.
Claims (9)
1. the digital predistortion process apparatus of a mobile communication system, it is characterised in that include predistortion processor, a plurality of dual-mode antenna and be connected to a plurality of up transmission link between predistortion processor and a plurality of dual-mode antenna,
Described up transmission link includes D/A modular converter, wave filter, upconverter and the power amplifier being sequentially connected with；
Also including being connected to described in each bar a feedback link between transmitting chain outfan and described predistortion processor, feedback link, according to the digital intermediate frequency feedback signal received, carries out the calculating of pre-distortion coefficients, and sends result of calculation to predistortion processor；
Described predistortion processor is used for preserving and update pre-distortion coefficients table, obtain the mean amplitude of the baseband digital signal of each carrier signal of current time slots, the mean amplitude of the baseband digital signal according to each carrier signal of described current time slots, it is calculated the DPD input range average of current time slots, DPD input range average according to described current time slots is chosen the baseband digital signal of the pre-distortion coefficients of the correspondence current time slots to being received from pre-distortion coefficients table and is carried out pre-distortion, generates the output of predistortion baseband digital signal.
The digital predistortion process apparatus of mobile communication system the most according to claim 1, it is characterised in that: described predistortion processor includes:
Time slot amplitude equalizing value computing module, for receiving the mean amplitude of the baseband digital signal of each carrier signal, the mean amplitude of the baseband digital signal according to each carrier signal received, it is calculated the DPD input range average of current time slots, the DPD input range average of described current time slots is exported and searches module to pre-distortion coefficients；
Pre-distortion coefficients searches module, for preserving and updating pre-distortion coefficients table, DPD input range average according to the current time slots from time slot amplitude equalizing value calculating sub module, from pre-distortion coefficients table, choose the pre-distortion coefficients of correspondence, selected pre-distortion coefficients is supplied to DPD forward direction processing module；
DPD forward direction processing module, for utilizing the pre-distortion coefficients searching module from pre-distortion coefficients, carries out pre-distortion to the baseband digital signal of the current time slots received, generates the output of predistortion baseband digital signal.
The digital predistortion process apparatus of mobile communication system the most according to claim 1, it is characterised in that: described feedback link includes multiway analog switch, down conversion module, filtration module, A/D modular converter and the feedback power computing module being sequentially connected with；
Described multiway analog switch connects the outfan of the power amplifier on transmitting chain described in each bar respectively, for alternatively gating the outfan of each described power amplifier, and the radio signal transmission that described power amplifier is exported to described down conversion module；
Described down conversion module is for being converted into intermediate-freuqncy signal by the radiofrequency signal of reception；
Described filtration module is for carrying out frequency-selective filtering to described intermediate-freuqncy signal；
Described A/D modular converter, for sampling filtered described intermediate-freuqncy signal, is sent to described feedback distortion computing module after described intermediate-freuqncy signal is converted to the feedback signal of digital baseband form.
The digital predistortion process apparatus of mobile communication system the most according to claim 2, it is characterised in that described pre-distortion coefficients is searched module and included:
Pre-distortion coefficients memory element, is used for preserving and update pre-distortion coefficients table；
Control unit, for receiving the DPD input range average of the current time slots from time slot amplitude equalizing value computing module, DPD input range average according to described current time slots, pre-distortion coefficients chosen by pre-distortion coefficients table from pre-distortion coefficients memory element, selected pre-distortion coefficients is supplied to DPD forward direction processing module.
5. the digital pre-distortion processing method of a mobile communication system, it is characterised in that including:
The feedback signal of each antenna is respectively fed to each signal input part of multiway analog switch；
During initialization, by switching multiway analog switch, the feedback signal of acquiescence being exported feedback link, feedback link, according to the digital intermediate frequency feedback signal received, carries out the calculating of pre-distortion coefficients, and sends result of calculation to predistortion processor；
Predistortion processor obtains the mean amplitude of the baseband digital signal of each carrier signal of current time slots；
The mean amplitude of the baseband digital signal according to each carrier signal of described current time slots, is calculated the DPD input range average of current time slots；
Described pre-distortion coefficients is searched module and is received the pre-distortion coefficients from feedback link and DPD input range average, utilizes described pre-distortion coefficients to be updated pre-distortion coefficients corresponding with described DPD input range average in pre-distortion coefficients table；
The baseband digital signal of the pre-distortion coefficients chosen described in the utilization of the DPD forward direction processing module current time slots to being received carries out pre-distortion, generates the output of predistortion baseband digital signal；
Judge whether to need to switch feedback signal；
When needs switching feedback signal, by switching multiway analog switch, the feedback signal switching needed is exported to feedback link.
The digital pre-distortion processing method of mobile communication system the most according to claim 5, it is characterized in that, farther include: receive the baseband digital signal of each carrier signal of current time slots, the mean amplitude of the baseband digital signal of carrier signal each to described current time slots calculates, and obtains the mean amplitude of the baseband digital signal of each carrier signal.
The digital pre-distortion processing method of mobile communication system the most according to claim 5, it is characterized in that: the mean amplitude of the baseband digital signal of described carrier signal each to current time slots is calculated as: the baseband digital signal of carrier signal each to current time slots, the amplitude of the adjacent N point of the current time slots of the baseband digital signal of this carrier signal is added averaged, obtains the mean amplitude of the baseband digital signal of this carrier signal.
The digital pre-distortion processing method of mobile communication system the most according to claim 5, it is characterized in that: the mean amplitude of the described baseband digital signal according to each carrier signal of current time slots, the DPD input range average being calculated current time slots is: the mean amplitude of the baseband digital signal of carrier signal each to described current time slots calculates quadratic sum, the quadratic sum calculated is opened quadratic power computing, obtains the DPD input range average of current time slots；
Or it is: utilize the yield value of the baseband digital signal of predetermined each carrier signal, the baseband digital signal of carrier signal each to current time slots carries out gain calculating, the mean amplitude of the described baseband digital signal carrying out each carrier signal of current time slots after gain calculating is calculated quadratic sum, the quadratic sum calculated is opened quadratic power computing, obtains the DPD input range average of current time slots.
9. according to the digital pre-distortion processing method of the mobile communication system according to any one of claim 5 to 7, it is characterised in that described in carry out pre-distortion coefficients calculating before, farther include: receive the DPD input range average of described current time slots；
Pre-distortion coefficients that described utilization is calculated update pre-distortion coefficients table by: utilize the pre-distortion coefficients calculated that pre-distortion coefficients corresponding with described DPD input range average in pre-distortion coefficients table is updated.
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| WO2019129013A1 (en) * | 2017-12-29 | 2019-07-04 | 华为技术有限公司 | Correction device and method |
| CN111901261A (en) * | 2020-07-03 | 2020-11-06 | 锐迪科创微电子（北京）有限公司 | Method and device for calibrating amplitude offset and storage medium |
| CN112543157A (en) * | 2019-09-20 | 2021-03-23 | 美国亚德诺半导体公司 | Digital Predistortion (DPD) in a wireless transmitter |
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2015
- 2015-06-30 CN CN201510372890.3A patent/CN106330802A/en active Pending
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| CN109995393A (en) * | 2017-12-29 | 2019-07-09 | 华为技术有限公司 | A kind of means for correcting and method |
| CN112543157A (en) * | 2019-09-20 | 2021-03-23 | 美国亚德诺半导体公司 | Digital Predistortion (DPD) in a wireless transmitter |
| CN112543157B (en) * | 2019-09-20 | 2024-05-31 | 美国亚德诺半导体公司 | Apparatus and method for digitally predistortion DPD in a wireless transmitter |
| CN111901261A (en) * | 2020-07-03 | 2020-11-06 | 锐迪科创微电子（北京）有限公司 | Method and device for calibrating amplitude offset and storage medium |
| CN112953409A (en) * | 2021-01-25 | 2021-06-11 | 南京濠暻通讯科技有限公司 | DPD device and method suitable for 5G broadband MIMO system |
| WO2021148061A3 (en) * | 2021-01-25 | 2021-11-11 | 南京濠暻通讯科技有限公司 | Dpd device and method for 5g broadband mimo system |
| CN112953409B (en) * | 2021-01-25 | 2022-03-15 | 南京濠暻通讯科技有限公司 | DPD device and method suitable for 5G broadband MIMO system |
| CN114553247A (en) * | 2022-04-08 | 2022-05-27 | 上海星思半导体有限责任公司 | Radio frequency circuit, and method and device for determining digital predistortion coefficient set |
| CN115766356A (en) * | 2022-11-11 | 2023-03-07 | 成都芯通软件有限公司 | Method, device, equipment and medium for configuring predistorter coefficients |
| CN115766356B (en) * | 2022-11-11 | 2024-06-07 | 成都芯通软件有限公司 | Predistorter coefficient configuration method, predistorter coefficient configuration device, predistorter coefficient configuration equipment and predistorter coefficient configuration medium |
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