CN104883140A - Digital predistortion device based on broadband radio frequency power amplifier - Google Patents
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Abstract
The invention discloses a digital predistortion device based on a broadband radio frequency power amplifier, relates to the technical field of wireless communication, and overcomes the defects that the traditional digital predistortion method in the prior art requires a higher sampling rate of an ADC when being applied to a broadband communication system, so that the hardware cost of digital predistortion processing and the system power consumption are greatly increased. According to the digital predistortion device based on the broadband radio frequency power amplifier, the band-pass filter is added in the feedback channel and used for limiting the bandwidth of the radio frequency signal output by the broadband radio frequency power amplifier, so that the minimum bandwidth of the feedback radio frequency signal output by the band-pass filter is the bandwidth of the baseband signal input by the digital predistorter.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of digital predistortion apparatus based on wide-band radio frequency power amplifier.
Background technology
Along with the development of the wireless communication technologys such as LTE-advanced and IEEE802.11ac, adopt complicated modulation system and wider signal bandwidth to become the indispensable characteristic of signal transmission, and these characteristics make the output behavior of radio-frequency power amplifier become more complicated.In wireless communication transmissions system, the nonlinear characteristic of radio-frequency power amplifier not only brings distortion to signal transmission, also causes great waste to the energy resource consumption of system.Therefore, the digital pre-distortion technology research for wide-band radio frequency power amplifier seems particularly important.
Existing digital pre-distortion method mainly carries out linearization process for narrow band signal.In narrow-band communication system, because the input signal of radio-frequency power amplifier and the bandwidth of output signal are all smaller compared with the sampling rate of analog to digital converter (ADC), therefore traditional digital pre-distortion method is adopted, namely the input signal of radio frequency power amplifier and output signal are caught, and when calculating digital pre-distortion process with this, required penalty coefficient is feasible.
But, in the wide-band communication system being similar to LTE-advanced and IEEE802.11ac, because the input signal bandwidth of radio-frequency power amplifier reaches 80MHz, output signal bandwidth due to the spread spectrum phenomenon of power amplifier will close to 400MHz, if still adopt traditional digital pre-distortion method, then require that analog to digital converter (ADC) has close to 1GSPS (Gigabit Samples Per Second, i.e. gigabit per second time sampling) sampling rate, as can be seen here, the sampling rate of the ADC required when traditional digital pre-distortion method is applied in wide-band communication system is higher, and then significantly increase the hardware cost of digital pre-distortion process, also significantly increase the power consumption of system simultaneously.
Summary of the invention
The invention provides a kind of digital predistortion apparatus based on wide-band radio frequency power amplifier, it can reduce the sampling rate of the ADC in digital pre-distortion processing procedure, and then reduces system power dissipation and the hardware cost needed for digital pre-distortion process.
The invention provides a kind of digital predistortion apparatus based on wide-band radio frequency power amplifier, described device comprises forward path and feedback path, wherein, described forward path comprises digital predistorter, digital to analog converter, radio frequency sending module and wide-band radio frequency power amplifier, described feedback path comprises Receiver Module, analog to digital converter and coefficients calculation block, described feedback path also comprises band pass filter and equivalent Nonlinear processing module, wherein, described digital predistorter, be connected with described coefficients calculation block and described digital to analog converter respectively, the forward direction baseband signal of penalty coefficient to input for exporting according to described coefficients calculation block carries out pre-distortion, and the forward direction baseband signal through pre-distortion is sent to described digital to analog converter,
Described digital to analog converter, is connected with described radio frequency sending module, obtains forward simulation signal, and the forward simulation signal obtained through digital-to-analogue conversion is sent to described radio frequency sending module for carrying out digital-to-analogue conversion to the forward direction baseband signal through pre-distortion;
Described radio frequency sending module, is connected with described wide-band radio frequency power amplifier, for carrying out up-conversion to described forward simulation signal, obtains forward direction radiofrequency signal, and described forward direction radiofrequency signal is sent to described wide-band radio frequency power amplifier;
Described wide-band radio frequency power amplifier, the forward direction radiofrequency signal for exporting described radio frequency sending module carries out amplification process;
Described band pass filter, be connected with described Receiver Module, forward direction radiofrequency signal for exporting the described wide-band radio frequency power amplifier being coupled to described feedback path is carried out filtering process and is obtained feeding back radiofrequency signal, and described feedback radiofrequency signal is sent to described Receiver Module, wherein, the minimum bandwidth of described feedback radiofrequency signal is the bandwidth of the forward direction baseband signal of described digital predistorter input;
Described Receiver Module, is connected with described analog to digital converter, for carrying out down-conversion to described feedback radiofrequency signal, obtains feedback analog signal, and described feedback analog signal is sent to described analog to digital converter;
Described analog to digital converter, is connected with described coefficients calculation block, and the feedback analog signal for exporting described Receiver Module carries out analog-to-digital conversion and obtains feeding back baseband signal;
Described coefficients calculation block, be connected with described analog to digital converter, described equivalent Nonlinear processing module and described digital predistorter respectively, for the penalty coefficient of the Equivalent Base-Band calculated signals digital pre-distortion that the feedback baseband signal that exports according to described analog to digital converter and described equivalent Nonlinear processing module export, and the penalty coefficient of described digital pre-distortion is sent described digital predistorter, until the output signal of described wide-band radio frequency power amplifier meets system requirements;
Described equivalent Nonlinear processing module, the forward direction baseband signal for inputting described digital predistorter is carried out equivalent Nonlinear Processing and is obtained Equivalent Base-Band signal.
Alternatively, described coefficients calculation block, the Equivalent Base-Band signal exported for the feedback baseband signal that exports according to described analog to digital converter and described equivalent Nonlinear processing module obtains characterizing the error function of non-linearity of power amplifier characteristic, utilize described error function to calculate the penalty coefficient of described digital pre-distortion, and the described penalty coefficient calculated is sent to described digital predistorter.
Alternatively, described forward path also comprises acquisition module, wherein, described acquisition module, be connected with described digital predistorter and described equivalent Nonlinear processing module respectively, for gathering the forward direction baseband signal to described digital predistorter to be entered, and the described forward direction baseband signal collected is sent to described digital predistorter and described equivalent Nonlinear processing module.
Digital predistortion apparatus based on wide-band radio frequency power amplifier provided by the invention, it by increasing a band pass filter in feedback path, described band pass filter is used for limiting the bandwidth of the radiofrequency signal that wide-band radio frequency power amplifier exports, and the minimum bandwidth of the feedback radiofrequency signal that described band pass filter is exported is the bandwidth of the baseband signal of described digital predistorter input; Meanwhile, by increasing an equivalent Nonlinear processing module in feedback path, the described forward direction baseband signal for inputting digital predistorter is carried out equivalent Nonlinear Processing and is obtained Equivalent Base-Band signal.Compared with prior art, on the one hand, it can reduce the sampling rate of the analog to digital converter in digital pre-distortion processing procedure, and avoid aliasing, to ensure that wide-band communication system can be sampled to the radiofrequency signal that wide-band radio frequency power amplifier exports with lower sampling rate, and then reduce system power dissipation and the hardware cost needed for digital pre-distortion process; On the other hand, it can obtain the nonlinear characteristic of wide-band radio frequency power amplifier by the predistorted input signal of equivalence and feedback signal, so just can realize the linearisation effect same with traditional digital pre-distortion method.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of digital predistortion apparatus one embodiment that the present invention is based on wide-band radio frequency power amplifier;
Fig. 2 is the multinomial theory diagram of Nonlinear processing module equivalent described in the present invention;
Fig. 3 is the look-up table theory diagram of Nonlinear processing module equivalent described in the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making other embodiments all obtained under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the embodiment of the present invention provides a kind of digital predistortion apparatus based on wide-band radio frequency power amplifier, described device forward path and feedback path, wherein, described forward path comprises digital predistorter 1, digital to analog converter 2, radio frequency sending module 3 and wide-band radio frequency power amplifier 4, and described feedback path comprises band pass filter 5, Receiver Module 6, analog to digital converter 7 and coefficients calculation block 8 and equivalent Nonlinear processing module 9.
Described digital predistorter 1, be connected with described coefficients calculation block 8 and described digital to analog converter 2 respectively, the forward direction baseband signal of penalty coefficient to input for exporting according to described coefficients calculation block 8 carries out pre-distortion, and the forward direction baseband signal through pre-distortion is sent to described digital to analog converter 2;
In the present embodiment, the power amplifier model of digital predistorter 1 adopts memory polynomial model, and its output signal is expressed as
in formula, x (n) represents the input signal of predistortion, and y (n) represents the output signal of predistortion, a
kqrepresent the coefficient of pre-distortion, wherein Q represents memory depth, K representative polynomial exponent number.It should be noted that, the memory polynomial model adopted in the present embodiment is the one in power amplifier model, and main contents of the present invention are not only confined to memory polynomial, also includes other power amplifier model based on polynomial form.
Described digital to analog converter 2, is connected with described radio frequency sending module 3, obtains forward simulation signal, and the forward simulation signal obtained through digital-to-analogue conversion is sent to described radio frequency sending module for carrying out digital-to-analogue conversion to the forward direction baseband signal through pre-distortion;
Described radio frequency sending module 3, is connected with described wide-band radio frequency power amplifier 4, for carrying out up-conversion to described forward simulation signal, obtains forward direction radiofrequency signal, and described forward direction radiofrequency signal is sent to described wide-band radio frequency power amplifier 4;
Described wide-band radio frequency power amplifier 4, the forward direction radiofrequency signal for exporting described radio frequency sending module 3 carries out amplification process;
Described band pass filter 5, be connected with described Receiver Module 6, forward direction radiofrequency signal for exporting the described wide-band radio frequency power amplifier 4 being coupled to described feedback path is carried out filtering process and is obtained feeding back radiofrequency signal, and described feedback radiofrequency signal is sent to described Receiver Module 6, wherein, the minimum bandwidth of described feedback radiofrequency signal is the bandwidth of the forward direction baseband signal of described digital predistorter 1 input;
Described Receiver Module 6, is connected with described analog to digital converter 7, for carrying out down-conversion to described feedback radiofrequency signal, obtains feedback analog signal, and described feedback analog signal is sent to described analog to digital converter 7;
Described analog to digital converter 7, is connected with described coefficients calculation block 8, and the feedback analog signal for exporting described Receiver Module 6 carries out analog-to-digital conversion and obtains feeding back baseband signal;
Described coefficients calculation block 8, be connected with described analog to digital converter 7, described equivalent Nonlinear processing module 9 and described digital predistorter 1 respectively, for the penalty coefficient according to the feedback baseband signal of described analog to digital converter 7 output and the Equivalent Base-Band calculated signals digital pre-distortion of described equivalent Nonlinear processing module 9 output, and the penalty coefficient of described digital pre-distortion is sent described digital predistorter 1, until the output signal of described wide-band radio frequency power amplifier 4 meets system requirements;
Further, coefficients calculation block 8 calculates the coefficient in digital predistorter according to the data gathered.In traditional method, the general indirect arrangements that adopts calculates pre-distortion coefficients.Its basic foundation is between the output signal of predistorter and feedback signal, only there is the impact of power amplifier characteristics, thus guarantees that digital predistorter output signal and the difference between feedback signal correctly can reflect the nonlinear characteristic of power amplifier.In the present invention, feedback loop introduces band pass filter, destroy the relation between predistored output signal and feedback signal.Between digital predistorter input signal and feedback signal, the impact of band pass filter is smaller, and the impact of power amplifier is occupied an leading position, can think between the two difference reflection power amplifier nonlinear characteristic.Therefore, present invention employs the digital pre-distortion system of direct organization.
Described equivalent Nonlinear processing module 9, the forward direction baseband signal for inputting described digital predistorter 1 is carried out equivalent Nonlinear Processing and is obtained Equivalent Base-Band signal.
In traditional digital pre-distortion treatment system, equivalence Nonlinear processing module generally all adopts the model identical with digital predistorter to generate Equivalent Base-Band signal, but due in the present invention, the coefficient calculations of digital predistorter have employed direct organization computing, on feedback loop, introducing band pass filter simultaneously, therefore needing to introduce low pass filter in equivalent process module to eliminate these impacts.
Particularly, the realization of equivalent Nonlinear processing module can adopt polynomial function form and form of look.Wherein polynomial function form designs based on mathematical logic module, as shown in Figure 2.Form of look then utilizes the allocation index of amplitude as pre-distortion coefficients of input signal, as shown in Figure 3.
As shown in Figure 2, for multinomial implementation, give the structural representation of equivalent Nonlinear processing module 9 of the present invention.Wherein signal z (n) is expressed as
in formula, x (n) represents base-band input signal, z (n) represents equivalent Nonlinear processing module intermediate output signal, wherein Q represents memory depth, K representative polynomial exponent number, the value of Q with K is identical with the value of multinomial exponent number with memory depth in digital predistortion processor 1 respectively.Signal z (n) enters low pass filter subsequently, in order to cancellation band bandpass filter is on the impact of digital predistorter coefficient calculations, the transmission bandwidth of low pass filter is identical with band pass filter 5, and the band internal characteristic of its band internal characteristic and band pass filter 5 is consistent.In fig. 2, in order to figured simplicity, only provide the structural representation of equivalent Nonlinear processing module when memory depth Q is 0, usually, can also be 3 or 6 etc., this depends on the value of Q in described digital predistortion processor 1.
As shown in Figure 3, in look-up tables'implementation mode, give the structural representation of equivalent Nonlinear processing module 9 of the present invention.Concrete described look-up table can be expressed as
x (n) represents base-band input signal, K representative polynomial exponent number, and the value of Q with K is identical with the value of multinomial exponent number with memory depth in digital predistortion processor 1 respectively.Signal enters low pass filter subsequently, and in order to cancellation band bandpass filter is on the impact of digital predistorter coefficient calculations, the transmission bandwidth of low pass filter is identical with band pass filter 5, and the band internal characteristic of its band internal characteristic and band pass filter 5 is consistent.In figure 3, in order to figured simplicity, only provide the structural representation of equivalent Nonlinear processing module when memory depth Q is 0, usually, can also be 3 or 6 etc., this depends on the value of Q in described digital predistortion processor 1.
Digital predistortion apparatus based on wide-band radio frequency power amplifier provided by the invention, it by increasing a band pass filter in feedback path, described band pass filter is used for limiting the bandwidth of the radiofrequency signal that wide-band radio frequency power amplifier exports, and the minimum bandwidth of the feedback radiofrequency signal that described band pass filter is exported is the bandwidth of the baseband signal of described digital predistorter input; Meanwhile, by increasing an equivalent Nonlinear processing module in feedback path, the described forward direction baseband signal for inputting digital predistorter is carried out equivalent Nonlinear Processing and is obtained Equivalent Base-Band signal.Compared with prior art, on the one hand, it can reduce the sampling rate of the analog to digital converter in digital pre-distortion processing procedure, and avoid aliasing, to ensure that wide-band communication system can be sampled to the radiofrequency signal that wide-band radio frequency power amplifier exports with lower sampling rate, and then reduce system power dissipation and the hardware cost needed for digital pre-distortion process; On the other hand, it can obtain the nonlinear characteristic of wide-band radio frequency power amplifier by the predistorted input signal of equivalence and feedback signal, so just can realize the linearisation effect same with traditional digital pre-distortion method.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (3)
1. the digital predistortion apparatus based on wide-band radio frequency power amplifier, described device comprises forward path and feedback path, wherein, described forward path comprises digital predistorter, digital to analog converter, radio frequency sending module and wide-band radio frequency power amplifier, described feedback path comprises Receiver Module, analog to digital converter and coefficients calculation block, it is characterized in that, described feedback path also comprises band pass filter and equivalent Nonlinear processing module, wherein
Described digital predistorter, be connected with described coefficients calculation block and described digital to analog converter respectively, the forward direction baseband signal of penalty coefficient to input for exporting according to described coefficients calculation block carries out pre-distortion, and the forward direction baseband signal through pre-distortion is sent to described digital to analog converter;
Described digital to analog converter, is connected with described radio frequency sending module, obtains forward simulation signal, and the forward simulation signal obtained through digital-to-analogue conversion is sent to described radio frequency sending module for carrying out digital-to-analogue conversion to the forward direction baseband signal through pre-distortion;
Described radio frequency sending module, is connected with described wide-band radio frequency power amplifier, for carrying out up-conversion to described forward simulation signal, obtains forward direction radiofrequency signal, and described forward direction radiofrequency signal is sent to described wide-band radio frequency power amplifier;
Described wide-band radio frequency power amplifier, the forward direction radiofrequency signal for exporting described radio frequency sending module carries out amplification process;
Described band pass filter, be connected with described Receiver Module, forward direction radiofrequency signal for exporting the described wide-band radio frequency power amplifier being coupled to described feedback path is carried out filtering process and is obtained feeding back radiofrequency signal, and described feedback radiofrequency signal is sent to described Receiver Module, wherein, the minimum bandwidth of described feedback radiofrequency signal is the bandwidth of the forward direction baseband signal of described digital predistorter input;
Described Receiver Module, is connected with described analog to digital converter, for carrying out down-conversion to described feedback radiofrequency signal, obtains feedback analog signal, and described feedback analog signal is sent to described analog to digital converter;
Described analog to digital converter, is connected with described coefficients calculation block, and the feedback analog signal for exporting described Receiver Module carries out analog-to-digital conversion and obtains feeding back baseband signal;
Described coefficients calculation block, be connected with described analog to digital converter, described equivalent Nonlinear processing module and described digital predistorter respectively, for the penalty coefficient of the Equivalent Base-Band calculated signals digital pre-distortion that the feedback baseband signal that exports according to described analog to digital converter and described equivalent Nonlinear processing module export, and the penalty coefficient of described digital pre-distortion is sent described digital predistorter, until the output signal of described wide-band radio frequency power amplifier meets system requirements;
Described equivalent Nonlinear processing module, the forward direction baseband signal for inputting described digital predistorter is carried out equivalent Nonlinear Processing and is obtained Equivalent Base-Band signal.
2. device according to claim 1, it is characterized in that, described coefficients calculation block, the Equivalent Base-Band signal exported for the feedback baseband signal that exports according to described analog to digital converter and described equivalent Nonlinear processing module obtains characterizing the error function of non-linearity of power amplifier characteristic, utilize described error function to calculate the penalty coefficient of described digital pre-distortion, and the described penalty coefficient calculated is sent to described digital predistorter.
3. device according to claim 1 and 2, it is characterized in that, described forward path also comprises acquisition module, wherein, described acquisition module, being connected with described digital predistorter and described equivalent Nonlinear processing module respectively, for gathering the forward direction baseband signal to described digital predistorter to be entered, and the described forward direction baseband signal collected being sent to described digital predistorter and described equivalent Nonlinear processing module.
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| CN110166007A (en) * | 2019-05-08 | 2019-08-23 | 东南大学 | Wideband power amplifier digital predistortion system and method based on advance item model |
| CN113055323A (en) * | 2021-03-03 | 2021-06-29 | 青岛矽昌通信技术有限公司 | Method and system for digital predistortion processing of communication system |
| CN113098406A (en) * | 2019-12-23 | 2021-07-09 | 亚德诺半导体国际无限责任公司 | System and method for compensating for narrow-band distortion in power semiconductor devices |
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| WO2024051520A1 (en) * | 2022-09-08 | 2024-03-14 | 中兴通讯股份有限公司 | Digital predistortion circuit and method, and radio frequency chip and electronic device |
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Application publication date: 20150902 |