CN103916088A - Digital correction device and correction method of radio-frequency signal - Google Patents
Digital correction device and correction method of radio-frequency signal Download PDFInfo
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Abstract
The invention relates to a digital correction device and a correction method of a radio-frequency signal. The digital correction device of the radio-frequency signal comprises a radio-frequency modulation module for modulating an input signal and outputting a corresponding signal, a correction information storage module, a correction processing module for carrying out correction processing and outputting a corresponding signal according to the input information of the radio-frequency modulation module and the correction information storage module, and a power amplification module for amplifying the power of the signal output by the correction processing module and then outputting the power amplified signal, and feeding back the output signal to the correction information storage module, wherein the correction information storage module comprises an address shifting register and a memory, the address of the memory is composed of a group of data registers, input data is sent to the address shifting register in a serial way, and information stored in a memory unit of the memory comprises predistortion information to be corrected.
Description
Technical field
The present invention relates to a kind of digital apparatus for correcting and antidote thereof of radiofrequency signal.
Background technology
Now, in the transmission equipment of radio communication emission system, performance, signal quality and the cost tool of the operating characteristic of high-power amplifier module (HPA) to whole wireless communication system is marginal.For the given power of system and performance index, the performance characteristics of power amplifier module worsens the expansion along with input signal linear work scope, and its price is also by significantly soaring along with the expansion of its linear working range.Therefore, adopt the pre-distortion technology of extended power amplification module linear working range to replace to buy the Research Significance of more high-grade HPA device great.For research and the application of the extended power amplification module range of linearity, adopt pre-distortion technology, there are abroad chip and the algorithm product of a lot of maturations, occur that a variety of Digital adaptive pre-distortion technology are as around-France in: digital look-up table, Descartes etc., although the practical application of these methods and technology is also in continuous expansion, the effect of practical application is not very good.Its reason is the dissimilar power amplifier module using in digital algorithm and wireless system, there are differences in the characteristic of coupling and input signal, causes the different-effect to non-linear correction.
Summary of the invention
Technical problem to be solved by this invention is, can mate preferably and adapt to dissimilar power amplifier module in the transmission equipment of radio communication emission system, causes the better effects if to non-linear correction.
First the present invention provides a kind of digital apparatus for correcting of radiofrequency signal, comprising:
Rf modulations module, for modulating and export corresponding signal to the signal of input;
Correct information storage module, comprise: address shift register and memory, the address of described memory is to be made up of one group of data register, input data are sent into address shift register by serial mode, and the information storing in the memory cell of described memory comprises the predistortion information of proofreading and correct;
Correction process module, for according to the information of described rf modulations module and the input of rectification information storage module, carries out correction process and exports corresponding signal; And,
Power amplifier module, for the signal of described correction process module output is carried out to power amplification output, and feeds back to described rectification information storage module by its output signal.
Accordingly, the present invention also provides a kind of antidote of the digital apparatus for correcting that adopts described radiofrequency signal, comprises the steps:
Corresponding signal is modulated and exported to described rf modulations module to the signal of input;
Described rectification information storage module by the signal of described rf modulations module and power amplifier module output, is exported corresponding predistortion information to described correction process module according to respectively;
Described correction process module, is carried out correction process and exports corresponding signal and carry out power amplification output to described power amplifier module by the signal of described rectification information storage module and the output of rf modulations module according to respectively.
Compared with the prior art, the invention has the advantages that, be to adopt the pre-distortion algorithms of store-memory to correct the power amplifier module with memory characteristic, and this processing directly can be applied in radio frequency domains.Adopt the pre-distortion algorithms of stored digital memory in the application of RF application, object is that the power amplifier module nonlinear characteristic not only reaching having memory function is better corrected, and the rectification information after digital processing directly can be corrected radio frequency amplifier in radio frequency domains.This digitized processing method, future realize digitlization radio-frequency technique and system vital.
Brief description of the drawings
Fig. 1 is the structured flowchart of a kind of embodiment of digital apparatus for correcting of radiofrequency signal of the present invention;
Fig. 2 is further concrete structured flowchart of part of module embodiment illustrated in fig. 1;
Fig. 3 is the nonlinear characteristic AM-AM(amplitude-amplitude of power amplifier module) distorted characteristic schematic diagram;
Fig. 4 is the nonlinear characteristic AM-PM(amplitude-phase place of power amplifier module) distorted characteristic schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described further.
As depicted in figs. 1 and 2, a kind of digital apparatus for correcting of radiofrequency signal, comprising:
Rf modulations module, for modulating and export corresponding signal to the signal of input;
Correct information storage module, comprise: address shift register and memory, the address of described memory is to be made up of one group of data register, input data are sent into address shift register by serial mode, and the information storing in the memory cell of described memory comprises the predistortion information of proofreading and correct;
Correction process module, for according to the information of described rf modulations module and the input of rectification information storage module, carries out correction process and exports corresponding signal; And,
Power amplifier module, for the signal of described correction process module output is carried out to power amplification output, and feeds back to described rectification information storage module by its output signal.
Preferably, in described rectification information storage module, the nonlinear characteristic of the corresponding described power amplifier module of described predistortion information, and according to by described rf modulations module institute input signal, complete the mapping of address to corresponding information.
Wherein, the predistortion information in described rectification information storage module comprises the first rectification component (PD-I in) and the second rectification component (PD-Q in);
Described correction process module comprises:
Quadrature modulator, for carrying out angular transition by the signal of described rf modulations module input;
The first multiplier, for correcting component (PD-I in) and carry out multiplication process output by the signal of described rf modulations module input described first;
The second multiplier, carries out multiplication process output for correcting component (PD-Q in) by described second with the signal of being inputted by described quadrature modulator; With,
Signal synthesizer, for synthesizing the signal of described the first multiplier and the second multiplier output and outputing to described power amplifier module.
Accordingly, adopt the antidote of the digital apparatus for correcting of described radiofrequency signal, comprise the steps:
Corresponding signal is modulated and exported to described rf modulations module to the signal of input;
Described rectification information storage module by the signal of described rf modulations module and power amplifier module output, is exported corresponding predistortion information to described correction process module according to respectively;
Described correction process module, is carried out correction process and exports corresponding signal and carry out power amplification output to described power amplifier module by the signal of described rectification information storage module and the output of rf modulations module according to respectively.
In an embodiment, adopting the object of digital pre-distortion method, is the linearity that will improve power amplifier module.And the assessment of the power amplifier linearity is assessed by this index of ACPR.Therefore, digital pre-distortion object is exactly to improve the ACPR index of power amplifier.Analyze the nonlinear characteristic of power amplifier, weigh exactly its various distorted characteristics, mainly concentrate on AM-AM(amplitude-amplitude) distorted characteristic and AM-PM(amplitude-phase place) distorted characteristic, as shown in Fig. 3 and Fig. 4.Wherein, AM-AM amplitude-amplitude distortion characteristic is exactly the gain compression phenomenon of amplifier, has produced AM-AM distortion.Its characteristic can adopt nonlinear multinomial to characterize this specific character of amplifier:
(1)
The numerical value of output signal Y in formula is to be determined by the amplitude (AM) of input signal.Under the certain condition of rf gain, in, can, according to the amplitude of input signal (power), can calculate this kind of nonlinear distortion component by a multinomial.For the AM-PM distorted characteristic of amplitude-phase place, there are many similarities with AM-AM distortion, be also to be determined by the amplitude of input signal.Suppose that as shown in Figure 3 input signal is:
While adding AM-AM distortion, can be expressed as:
（2）
Wherein ω m is modulation signal angular frequency.
The characteristic of the broadband high-speed wireless communication system of development in recent years to power amplifier module and the overall performance of system have proposed stricter requirement.In order to effectively utilize valuable frequency spectrum resource, power amplifier module should ensure that high linearity, to reduce the error rate with outer transmitting power and signal reception, has higher efficiency again to reduce electrical source consumption.Although particularly the efficient linear modulation technique of development in recent years can provide good spectrum efficiency as the multi-carrier modulations such as QPSK, QAM and OFDM etc., but non-linear due to the high-power amplifier module in transmitter (HPA), the fluctuation envelope signal producing after modulation can cause that HPA subsequently produces all kinds of intermodulation distortion, and intermodulation distortion presents interference phenomenon in adjacent frequency interference, band more.In order to ensure the linear characteristic of HPA, need to use pre-distortion technology.Traditional pre-distortion method is to add a nonlinear digital processing element in the baseband portion of modulator, namely, as the device digital pre-distortion (DPD) of non-linear correction, predistorter and power amplifier module is done as a whole.Like this, the entire gain characteristic of transmitting path is linear.
Predistortion is divided into analog predistortion and digital pre-distortion, is all the envelope of power amplifier module is regulated.Analog predistortion occurs relatively early, and technology comparative maturity.Analogue technique cost is relatively low, and it is better that the intermediate frequency predistortion circuit that only need manually adjust can be worked.And digital pre-distortion technology is the application along with transmission of digital signals, constantly on the basis of expansion, progressively grow up, suppress the distortion of HPA with adaptive digital pre-distortion technology, can play than the better effect of analogy method.In numerous power amplifier linearization high efficiency technology, digital pre-distortion technology is considered to the most effective solution, receives increasing concern.
But, pre-distortion technology using in wireless communication field at present and products thereof, the characteristic existing for actual power amplification module, need to introduce Memory algorithm processes power amplifier module, but because the complexity of Memory algorithm increases, caused again the amount of calculation while processing obviously to increase, cause thus this type of pre-distortion method practical application in the operand, the extremely contradiction between power consumption of device cost that cause.This patent propose method, be exactly the problem for current existence, propose a kind of solution at algorithm operation quantity, device from the contradiction between cost and system power consumption.
The present embodiment is the digital pre-distortion principle based on traditional, in the method for digital processing, has added memory function, the nonlinear distortion causing to solve the memory characteristic of power amplifier module.In this memory pre-distortion algorithms and characteristic come from the information table in system, in this table, storage and the predistortion component read have memory characteristic.The information combination of the information of these information and current input and former some moment inputs forms, and has therefore formed a kind of information mapping that has memory characteristic.The output signal of the pre-distortion unit forming has thus had effect of memory.Introduce the formation mechanism of this memory effect below.
The complex envelope of power amplifier module output signal can be expressed as
(3)
Here vQ is the output of quadrature modulator, and vp is pre-distorted signals, and H supposition is the transfer function of quadrature modulator, and G is the gain of power amplifier module.Therefore, the output of memory digital pre-distortion system can be expressed as equation below
(4)
Wherein, F is the mapping function of predistortion table, and it can be mapped to a real number output vr N n dimensional vector n Vm, and vm is the RF radio frequency complex signal of input.From the non-linear impact analysis to radio system of power amplifier, IM3 and IM5 are larger on the impact of high power amplifier, and IM3 (three intermodulation components) and IM5 can be by IM2 and IM4 and former baseband signal modulation generations, therefore as long as control the reverse nonlinear characteristic that predistorter produces, IM3 and IM5 single spin-echo that itself and high power amplifier and the modulation of former baseband signal are produced, can cancel very greatly or fully overall IM3 and IM5, make high power amplifier present linearisation, thereby significantly inhibition zone is launched, reduce inband distortion outward.
In order to correct the non-linear of power amplifier module, can, first by a store-memory information table, the non-linear feature extracton of power amplifier module memory be got up, then according to input signal, complete the mapping of address to corresponding information.The nonlinear transformations of storing in store-memory digital watch, obtain and upgrade in time by the computing of algorithm, and by algorithm by decent Information Read-Out, be used for compensation and corrigendum power amplifier module input signal, thereby the nonlinear characteristic of power amplifier module is proofreaied and correct.
For the pre-distortion system of memory function, the address of memory table is generated by input data, and store-memory digital watch is different from traditional predistortion look-up table.Storage and memory function that digital watch is introduced are to be determined by the serial signal input structure of digital watch.Each output signal corresponding to information that forms store-memory table address, not only comprises current incoming symbol, and has comprised several input messages above, is therefore a N n dimensional vector n.This just means, each,, to the non-linear correction signal of correcting of power amplifier module, is not only to be determined by the input signal of current time, but determined by the combination of the input signal in front some moment.The store-memory digital watch forming like this, not only introduces storage and memory mechanism, and has greatly improved the dynamic effect of whole pre-distortion system.Namely one group of N bit addresses code of predistortion table of this N dimension input signal vector, and can be expressed as
(5)
Each symbol sgi in this vector can be defined by following formula
(6)
The orthogonal signalling structure of base what mobile radio system, the predistortion table that corresponds respectively to I and Q two-way can be shone upon I component and the Q component of all binary system input data vectors to signal output, and can be expressed as:
(7)
The structure of predistortion memory table
Predistortion memory table is to be made up of address shift register and memory, and the address of memory is to be made up of one group of data register, and input data are sent into address shift register by serial mode.Corresponding memory table element has been determined, the information namely storing in memory cell, the i.e. non-linear predistortion information of proofreading and correct to power amplifier module in the address that address shift register forms.Suppose that each predistortion table address is a N-bit register, predistortion table has just comprised so
individual memory cell.Obviously, each output of predistortion table, is the combination of the function of data that N of past transmits.That is to say, the gamma correction amount of information that can store in predistortion table is
individual.And to applying each input, only have the nonlinear characteristic of choosing a predistortion valuation to carry out corrected power amplification module as output.Description above base what, we can be with the explanation of following mathematic(al) representation.First by the address vector representation of k moment predistortion table be:
(8)
In table, can be expressed as corresponding to all Input Address vectors of M predistortion table memory cell so
(9)
The rectification information that is equivalent to store in predistortion table is
(10)
In the moment of processing in real time at each, there is a predistortion valuation to read from table,
（11)
In formula, subscript iq (k)=Vm (k) represents by N as enters the determined address of binary character.The mapping function F of predistortion table just can be expressed as
(12)
Traditional digital pre-distortion processing is to carry out signal processing in the base band of system, and the predistortion correcting signal therefore forming in base-band digital system also must be simulated upconversion process, and delivers to power amplifier module and launch.The method that this patent proposes is, by the digital pre-distortion processing signals of numeric field realization, directly to correct the input signal of radio frequency power amplification module.
The radiofrequency signal that enters power amplifier is to be made up of amount part, and a part is established high-frequency carrier signal, and a part is the signal envelope that modulation intelligence forms.Correcting the input radio frequency signal of power amplifier module with the pre-distorted signals of base band, is exactly in fact the modulation envelope of correcting in radiofrequency signal.The advantage of the processing of digital pre-distortion directly being moved to radio frequency domains is, for digitlization and the digital pre-distortion processing of radio system provide great convenience in the combination of radio frequency domains.Meanwhile, the predistortion structure with memory characteristic has more distortion correction and the signal controlling of great dynamic range, is more suitable for the application to multichannel, the transmission of multi-carrier-wave wireless signal.
Traditional digital pre-distortion processing is to carry out signal processing in the base band of system, and the predistortion correcting signal therefore forming in base-band digital system also must be simulated upconversion process, and delivers to power amplifier module and launch.The method that this patent proposes is, by the digital pre-distortion processing signals of numeric field realization, directly to correct the input signal of radio frequency power amplification module.
Fig. 1 and Fig. 2 show the hardware block diagram of the antidote of radio frequency distortion.In figure, the processing of digital pre-distortion is placed on to radio-frequency front-end, digital pre-distortion baseband signal correcting signal after treatment, analog signal direct and radio frequency power amplification module input multiplies each other, to adjust the envelope of radio-frequency input signals.
Rf modulations module, for modulating and export corresponding signal to the signal of input;
Correct information storage module, comprise: address shift register and memory, the address of described memory is to be made up of one group of data register, input data are sent into address shift register by serial mode, and the information storing in the memory cell of described memory comprises the predistortion information of proofreading and correct;
Correction process module, for according to the information of described rf modulations module and the input of rectification information storage module, carries out correction process and exports corresponding signal; And,
Power amplifier module, for the signal of described correction process module output is carried out to power amplification output, and feeds back to described rectification information storage module by its output signal.
Signal PD_i in and PD_q in represent respectively the information in storage list of predistortion, after this signal is read from storage list, deliver to respectively correction process modules A M/AM, AM/BM correcting unit, and the radiofrequency signal of input is corrected;
Wherein, each signal component is all corresponding to the signal component of Fig. 1.It should be noted that, the radiofrequency signal RFin of input, before entering multiplier, is first divided into I component and Q component, and multiplies each other with signal component PD_i and the PD_q of predistortion memory table, forms predistortion complex signal afterwards multiple, and is input in power amplifier module.This memory pre-distortion method and structure can realize by the method for software and hardware, and combine with existing wireless communication system, form the emission system of a complete wireless signal.
Other it should be noted that:
1. the design philosophy that above-described embodiment proposes is suitable for all wireless telecommunication systems, and the modulation system (as QAM, QPSK, OFDM and other modulation system) of the method and system and the power amplifier module using are irrelevant.
2. above-described embodiment major advantage is, will store compensate function and introduce pre-distortion system.Like this, predistortion will be with store-memory function, thereby can in wider dynamic range, regulate all kinds of amplifier nonlinearity distortions.
3. in above-described embodiment, the store-memory method about predistortion is, the output calibration signal of each predistortion determined by current input, and it is the products by current and in the past multiple input signals combinations.
In above-described embodiment about pre-distortion method and structure, can be in radio frequency domains directly correct the input signal of power amplifier module, with realize to the non-linear of power amplifier module with correct.
Above content is further description made for the present invention in conjunction with specific embodiments, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1. a digital apparatus for correcting for radiofrequency signal, is characterized in that, comprising:
Rf modulations module, for modulating and export corresponding signal to the signal of input;
Correct information storage module, comprise: address shift register and memory, the address of described memory is to be made up of one group of data register, input data are sent into address shift register by serial mode, and the information storing in the memory cell of described memory comprises the predistortion information of proofreading and correct;
Correction process module, for according to the information of described rf modulations module and the input of rectification information storage module, carries out correction process and exports corresponding signal; And,
Power amplifier module, for the signal of described correction process module output is carried out to power amplification output, and feeds back to described rectification information storage module by its output signal.
2. the digital apparatus for correcting of radiofrequency signal as claimed in claim 1, it is characterized in that, in described rectification information storage module, the nonlinear characteristic of the corresponding described power amplifier module of described predistortion information, and according to by described rf modulations module institute input signal, complete the mapping of address to corresponding information.
3. the digital apparatus for correcting of radiofrequency signal as claimed in claim 1, is characterized in that,
Predistortion information in described rectification information storage module comprises the first rectification component (PD-I in) and the second rectification component (PD-Q in);
Described correction process module comprises:
Quadrature modulator, for carrying out angular transition by the signal of described rf modulations module input;
The first multiplier, for correcting component (PD-I in) and carry out multiplication process output by the signal of described rf modulations module input described first;
The second multiplier, carries out multiplication process output for correcting component (PD-Q in) by described second with the signal of being inputted by described quadrature modulator; With,
Signal synthesizer, for synthesizing the signal of described the first multiplier and the second multiplier output and outputing to described power amplifier module.
4. adopt an antidote for the digital apparatus for correcting of radiofrequency signal as claimed in claim 1, it is characterized in that, comprise the steps:
Corresponding signal is modulated and exported to described rf modulations module to the signal of input;
Described rectification information storage module by the signal of described rf modulations module and power amplifier module output, is exported corresponding predistortion information to described correction process module according to respectively;
Described correction process module, is carried out correction process and exports corresponding signal and carry out power amplification output to described power amplifier module by the signal of described rectification information storage module and the output of rf modulations module according to respectively.
5. antidote as claimed in claim 4, it is characterized in that, in described rectification information storage module, the nonlinear characteristic of the corresponding described power amplifier module of described predistortion information, and according to by described rf modulations module institute input signal, complete the mapping of address to corresponding information.
6. antidote as claimed in claim 4, is characterized in that,
Predistortion information in described rectification information storage module comprises the first rectification component (PD-I in) and the second rectification component (PD-Q in);
Described correction process module comprises:
Quadrature modulator, for carrying out angular transition by the signal of described rf modulations module input;
The first multiplier, for correcting component (PD-I in) and carry out multiplication process output by the signal of described rf modulations module input described first;
The second multiplier, carries out multiplication process output for correcting component (PD-Q in) by described second with the signal of being inputted by described quadrature modulator; With,
Signal synthesizer, for synthesizing the signal of described the first multiplier and the second multiplier output and outputing to described power amplifier module.
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| CN105187346A (en) * | 2015-09-25 | 2015-12-23 | 海能达通信股份有限公司 | Transmitter phase adaptive adjustment method and transmitter |
| WO2021135541A1 (en) * | 2019-12-30 | 2021-07-08 | 中兴通讯股份有限公司 | Pre-distortion processing method, device, apparatus, and storage medium |
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| CN100511976C (en) * | 2007-08-30 | 2009-07-08 | 京信通信***（中国）有限公司 | Digital pre-distorting power amplifier and implementing method thereof |
| CN101399637B (en) * | 2007-09-27 | 2012-01-25 | 联想（上海）有限公司 | Method for correcting signal in radio frequency link and pre-corrector |
| CN102098247A (en) * | 2010-11-27 | 2011-06-15 | 武汉虹信通信技术有限责任公司 | High-efficiency high-linearity repeater system and realizing method of high-efficiency high-linearity thereof |
| CN102143108A (en) * | 2011-03-17 | 2011-08-03 | 电子科技大学 | Improved self-adaption predistortion technology |
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| CN105187346A (en) * | 2015-09-25 | 2015-12-23 | 海能达通信股份有限公司 | Transmitter phase adaptive adjustment method and transmitter |
| CN105187346B (en) * | 2015-09-25 | 2019-03-05 | 海能达通信股份有限公司 | The method and transmitter that transmitter phase adaptively adjusts |
| WO2021135541A1 (en) * | 2019-12-30 | 2021-07-08 | 中兴通讯股份有限公司 | Pre-distortion processing method, device, apparatus, and storage medium |
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