CN102088427B - Digital predistortion device and method - Google Patents
Digital predistortion device and method Download PDFInfo
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Abstract
The present invention relates to a digital predistortion device and a method, which are applied to a multichannel single amplifier broadband digital wireless communication system and belong to the technological field of wireless communication. The device includes a time-delay filtering array, a synchronization switch, a quadrature demodulator, an analog-to-digital converter, a time-delay frequency conversion array connected with the synchronization switch and a digital predistortion unit, wherein all the units are connected in order, the input end of the time-delay filtering array is connected with the output end of a power amplifier of the multichannel single amplifier broadband digital wireless communication system, the input end of the digital predistortion unit receives the frequency conversed digital baseband signal, and the output end of the digital predistortion unit outputs a digital carrier. The digital predistortion device and the method resolve the predistortion problem of a multichannel single amplifier broadband digital wireless communication system.
Description
Technical field
What the present invention relates to is a kind of processing unit and method thereof of wireless communication technology field, specifically is a kind of digital predistortion apparatus and method thereof for multichannel list amplifier wideband digital line communication system.
Background technology
Radio-frequency power amplifier PA (Power Amplifier) is the important component part of wireless communication system.The subject matter that radio-frequency power amplifier faces is the characteristic of its nonlinear distortion, and this specific character has caused the serious decline of system power utilance.In order to address this is that, need carry out predistortion to the input of radio frequency amplifier usually.In digital communication system, this predistortion also realizes by the method for Digital Signal Processing usually.Thereby be called as digital pre-distortion.
Usually, digital pre-distortion system is determined the distortion level of amplifier by the output of comparison amplifier and the difference of input, and then determines how to compensate at this distortion.For digital pre-distortion, handle again after just the signal of PA output need being become digital signal by analog-to-digital conversion ADC (Analog-to-Digital-Converter).In the narrow wireless system of traditional bandwidth, this processing does not have any problem.
But, along with signal bandwidth broaden and and the multi channel signals of isolating mutually at frequency range simultaneously input amplifier situation (for example, in the frequency allocation of 3G and 4G, each operator just has been assigned to the frequency range of a plurality of isolation usually), input when requiring the equipment of base station to support multi channel signals.At this moment, the signal of PA output also is the signal after multiple signals merge.According to normal thinking, if will carry out the processing of predistortion to PA output this moment, need so to multiple signals and carry out predistortion together.But difficulty is that the common sample frequency frequency of ADC device is lower, does not satisfy each isolates the requirement that frequency band signals is sampled simultaneously on the whole frequency.
Through finding the retrieval of existing document, the method that may solve the above problems has two kinds of thinkings at present: once being to adopt a plurality of PA and corresponding radio-frequency channel that each road signal is amplified respectively when radio circuit designs, when predistortion, also can carry out predistortion to each road signal respectively like this, a kind of multichannel digital predistortion processing unit and pre-distortion method have been put down in writing as Chinese patent literature CN101594327A, this technology has reduced with regard to corresponding the requirement of ADC device, but the shortcoming of this method is cost increase at double owing to having increased many covers radio-frequency apparatus of system; Prior art adopts in addition directly carries out rollback to amplifier, and does not carry out predistortion, but this method then greatly reduces the power utilization of whole system.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of digital predistortion apparatus and method thereof are provided, signal to PA output passes through different delayer and the band pass filters of multichannel, and make it pass through ADC in the different moment by switch control, as the input of digital predistorter training module, obtain finally required digital predistorter after at last the signal of exporting being superposeed through different time delays again.The invention solves the predistortion problem of multichannel list amplifier wideband digital wireless communication system.
The present invention is achieved by the following technical solutions:
The present invention relates to a kind of digital predistortion apparatus, comprise: filtering wave by prolonging time array, synchro switch, quadrature demodulator and the analog to digital converter of Lian Jieing successively, and the time-delay frequency conversion array and the digital predistorter that link to each other with synchro switch, wherein: the input of filtering wave by prolonging time array links to each other with the output of the power amplifier of multichannel list amplifier wideband digital line communication system, the input of digital predistorter receives the digital baseband signal after the frequency conversion, the output output digital carrier of digital predistorter.
Described filtering wave by prolonging time array comprises: the first delayer array and the array of band-pass filters of cascade mutually with it.
Described time-delay frequency conversion array comprises: Digital Up Convert array and the adder of the second delayer array, phase cascade with it, and the output of digital up converter links to each other with adder, and adder carries out exporting digital predistorter to after the signal stack.
Described synchro switch is the double-pole multithrow switch.
Described digital predistorter is provided with the predistortion trainer, this predistortion trainer receives the output of multi channel signals after addition on the numeric field and the output of time-delay frequency conversion array in the multichannel list amplifier wideband digital line communication system simultaneously, by comparing these two signals, produce two and characterize the look-up table (LUT) of input/output signal amplitude/amplitude (AM/AM) relation and amplitude/phase (AM/PM) relation respectively and export digital predistorter to.
The present invention relates to the digital pre-distortion method of said apparatus, comprise the steps:
Step 1: input signal is carried out the delay process of * T of 0*T～(n-1) respectively, and wherein n is the number of active lanes that enters the signal of PA;
Step 2: adopt band pass filter that the n road signal through different delay is carried out bandpass filtering respectively;
Step 3: from the output signal of n road band pass filter, select one tunnel successively with the T time interval, this road signal is carried out quadrature demodulation;
Step 4: the signal after the quadrature demodulation is carried out analog-to-digital conversion;
Step 5: to the digital signal after the analog-to-digital conversion, output to respectively on n the signal path with the T time interval, and carry out the delay process of (n-1) * T～0*T respectively, wherein n is the number of active lanes that enters the signal of PA;
Step 6: this n road signal is carried out Digital Up Convert respectively;
Step 7: add operation is carried out through the signal after the Digital Up Convert in the n road;
Step 8: the signal of multi channel signals after addition on the numeric field in the signal that produces according to step 7 and the original system, carry out the training of predistorter;
Step 9: the LUT after the digital predistorter training is copied in the original system as digital predistorter, realize digital pre-distortion.
Compared with prior art, the present invention has solved the digital pre-distortion problem when existing multichannel input signal only to adopt single power amplifier simultaneously in the wideband digital wireless communication systems by to the selection of multiple signals time-division and the method for overlap-add procedure.The method does not namely need to increase the number of devices of radio circuit, power utilization that can step-down amplifier yet.
Description of drawings
Fig. 1 is apparatus of the present invention schematic diagram.
Fig. 2 is the inventive method flow chart.
Embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: filtering wave by prolonging time array, synchro switch, quadrature demodulator and the analog to digital converter of Lian Jieing successively, and the time-delay frequency conversion array and the digital predistorter that link to each other with synchro switch, wherein: the input of filtering wave by prolonging time array links to each other with the output of the power amplifier of multichannel list amplifier wideband digital line communication system, the input of digital predistorter receives the digital baseband signal after the frequency conversion, the output output digital carrier of digital predistorter.
Described filtering wave by prolonging time array comprises: the first delayer array and the array of band-pass filters of cascade mutually with it, wherein: the delayer array is made up of several simulation delayers, the time delay of i simulation delayer is (i-1) * T, the scope of i is to n from 1, wherein: n is simulation delayer number, i is sequence number, and T is delay cycle; Band pass filter number in the array of band-pass filters is n, and T is the integral multiple of least common multiple of the minimal sampling time of the undistorted sampling of signal.
Described time-delay frequency conversion array comprises: Digital Up Convert array and the adder of the second delayer array, phase cascade with it, the output of digital up converter links to each other with adder, adder carries out exporting digital predistorter to after the signal stack, wherein: the delayer array is made up of several digital time delayers, the time delay of j digital time delayer is (m-j) * T, wherein: m is the digital time delayer number, and j is sequence number, and T is delay cycle; Digital up converter number in the Digital Up Convert array is m, and T is the integral multiple of least common multiple of the minimal sampling time of the undistorted sampling of signal.
Described synchro switch is the double-pole multithrow switch, and wherein: a side that links to each other with the filtering wave by prolonging time array is selected one tunnel input as quadrature demodulator from the output of array of band-pass filters; A side that links to each other with time-delay frequency conversion array inputs to the output of analog to digital converter respectively arbitrary port of time-delay frequency conversion array.
The number of described simulation delayer is identical with the switch number of the number of digital time delayer and double-pole multithrow switch, and the switching of the both sides of double-pole multithrow switch fully synchronously and be delay cycle T.
Described digital predistorter is provided with the predistortion trainer, this predistortion trainer receives the output of multi channel signals after addition on the numeric field and the output of time-delay frequency conversion array in the multichannel list amplifier wideband digital line communication system simultaneously, by comparing these two signals, produce two and characterize the look-up table (LUT) of input/output signal amplitude/amplitude (AM/AM) relation and amplitude/phase (AM/PM) relation respectively and export digital predistorter to.
As shown in Figure 2, the flow process of the digital pre-distortion method in a kind of multichannel list amplifier wideband digital wireless communication systems of present embodiment comprises nine steps.
At first, S101: time delay processing for the first time, if the signal of this input amplifier has the n road altogether, so in this step, this n road signal is carried out time delay processing respectively, its time delay is followed successively by the * T of 0*T～(n-1), and wherein T can get the integral multiple of least common multiple of the minimal sampling time of each road signal.
S102: bandpass filtering, this step is carried out bandpass filtering respectively to n road signal, and the centre frequency of band pass filter is respectively the centre frequency of one road signal of correspondence, and its bandwidth is corresponding to the bandwidth of this road signal.
S103: quadrature demodulation, the signal behind the bandpass filtering is carried out radio demodulating.For example, if the centre carrier frequency of a certain road signal is ω
1, quadrature demodulation be multiply by cos ω respectively to primary signal exactly so
1T and sin ω
1T.
S104: analog-to-digital conversion to analog signal sampling and quantification, is converted into the numeric field signal.
S105: time delay processing for the second time outputs to respectively on n the signal path with the T time interval, and carries out the delay process of (n-1) * T～0*T respectively.This step is with time delay processing is corresponding for the first time.The overall delay of each road signal is all reached (n-1) * T.
S106: this n road signal is carried out Digital Up Convert respectively, make it consistent with its interval on radio frequency band at the relative spacing on the digital baseband.
S107: add operation is carried out through the signal after the Digital Up Convert in the n road, be merged into one road signal.
S108: the signal of multi channel signals after addition on the numeric field in the signal that produces according to S107 and the original system, carry out the training of predistorter;
S109: the LUT after the digital predistorter training is copied in the original system as digital predistorter, can finish the function of digital pre-distortion.
Claims (5)
1. digital predistortion apparatus, it is characterized in that, comprise: filtering wave by prolonging time array, synchro switch, quadrature demodulator and the analog to digital converter of Lian Jieing successively, and the time-delay frequency conversion array and the digital predistorter that link to each other with synchro switch, wherein: the input of filtering wave by prolonging time array links to each other with the output of the power amplifier of multichannel list amplifier wideband digital line communication system, the input of digital predistorter receives the digital baseband signal after the frequency conversion, the output output digital carrier of digital predistorter;
Described filtering wave by prolonging time array comprises: the first delayer array and the array of band-pass filters of cascade mutually with it, and wherein: the delayer array is made up of several simulation delayers; The time delay of i simulation delayer is (i-1) * T, and wherein: n is that sequence number and span are 1 to n for simulation delayer number, i, and T is delay cycle; Band pass filter number in the array of band-pass filters is n, and T is the integral multiple of least common multiple of the minimal sampling time of the undistorted sampling of signal;
Described time-delay frequency conversion array comprises: Digital Up Convert array and the adder of the second delayer array, phase cascade with it, the output of digital up converter links to each other with adder, adder carries out exporting digital predistorter to after the signal stack, and the delayer array is made up of several digital time delayers; The time delay of j digital time delayer is (m-j) * T, and wherein: m is the digital time delayer number, and j is sequence number, and T is delay cycle; Digital up converter number in the Digital Up Convert array is m, and T is the integral multiple of least common multiple of the minimal sampling time of the undistorted sampling of signal;
The quantity of described simulation delayer, digital time delayer and synchro switch is identical.
2. digital predistortion apparatus according to claim 1 is characterized in that, described synchro switch is the double-pole multithrow switch, and wherein: a side that links to each other with the filtering wave by prolonging time array is selected one tunnel input as quadrature demodulator from the output of array of band-pass filters; A side that links to each other with time-delay frequency conversion array inputs to the output of analog to digital converter respectively arbitrary port of time-delay frequency conversion array.
3. digital predistortion apparatus according to claim 2, it is characterized in that, the number of described simulation delayer is identical with the switch number of the number of digital time delayer and double-pole multithrow switch, and the switching of the both sides of the double-pole multithrow switch cycle synchronous fully and that switch equals delay cycle T.
4. digital predistortion apparatus according to claim 1, it is characterized in that, described digital predistorter is provided with the predistortion trainer, this predistortion trainer receives the output of multi channel signals after addition on the numeric field and the output of time-delay frequency conversion array in the multichannel list amplifier wideband digital line communication system simultaneously, by comparing these two signals, produce two and characterize the look-up table of input/output signal amplitude/amplitude relation and amplitude/phase relation respectively and export digital predistorter to.
5. the digital pre-distortion method according to the described device of above-mentioned arbitrary claim is characterized in that, comprises the steps:
Step 1: input signal is carried out the delay process of * T of 0*T ~ (n-1) respectively, and wherein n is the number of active lanes that enters the signal of radio-frequency power amplifier;
Step 2: adopt band pass filter that the n road signal through different delay is carried out bandpass filtering respectively;
Step 3: from the output signal of n road band pass filter, select one tunnel successively with the T time interval, this road signal is carried out quadrature demodulation;
Step 4: the signal after the quadrature demodulation is carried out analog-to-digital conversion;
Step 5: to the digital signal after the analog-to-digital conversion, output to respectively on n the signal path with the T time interval, and carry out the delay process of (n-1) * T ~ 0*T respectively, wherein n is the number of active lanes that enters the signal of radio-frequency power amplifier;
Step 6: this n road signal is carried out Digital Up Convert respectively;
Step 7: add operation is carried out through the signal after the Digital Up Convert in the n road;
Step 8: the signal of multi channel signals after addition on the numeric field in the signal that produces according to step 7 and the original system, carry out the training of predistorter;
Step 9: the look-up table after the digital predistorter training is copied in the original system as digital predistorter, realize digital pre-distortion.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102427437B (en) * | 2011-11-14 | 2015-08-19 | 上海交通大学 | Broadband power amplifier digital predistortion apparatus and pre-distortion method thereof |
| CN102412791A (en) * | 2011-11-29 | 2012-04-11 | 电子科技大学 | Digital pre-distortion processing method for high-efficiency power amplifier |
| CN102938638B (en) * | 2012-10-26 | 2015-04-22 | 宁波大学 | Cross coupling modeling method of concurrency multiband nonlinear system and linear device |
| JP6123497B2 (en) * | 2013-06-03 | 2017-05-10 | 住友電気工業株式会社 | Distortion compensation device and wireless communication device |
| CN104954306B (en) * | 2014-03-27 | 2018-03-13 | 华为技术有限公司 | Multichannel array device for compensation of distortion and method |
| CN104883140A (en) * | 2015-06-03 | 2015-09-02 | 中国科学院微电子研究所 | Digital predistortion device based on broadband radio frequency power amplifier |
| CN109314492B (en) * | 2016-07-08 | 2020-10-09 | 华为技术有限公司 | Digital predistortion processing device |
| CN109150213B (en) * | 2018-09-26 | 2020-11-10 | 西安烽火电子科技有限责任公司 | Digital predistortion system |
| CN109217828B (en) * | 2018-11-12 | 2024-03-22 | 京信网络系统股份有限公司 | Analog predistortion circuit and analog predistortion time division cancellation method |
| CN111200568B (en) | 2018-11-16 | 2021-05-18 | 华为技术有限公司 | Transmitting end device and signal processing method |
| CN112910476A (en) * | 2021-03-31 | 2021-06-04 | 天津七一二通信广播股份有限公司 | Anti-blocking interference broadband receiving equipment |
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| CN101594327A (en) * | 2008-05-26 | 2009-12-02 | 芯通科技（成都）有限公司 | Multichannel digital predistortion processing unit and pre-distortion method |
| CN101640516A (en) * | 2009-08-21 | 2010-02-03 | 京信通信系统（中国）有限公司 | Digital predistortion power amplifier and signal processing method thereof |
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Effective date of registration: 20160112 Address after: 61 building 100, 200433 Handan Road, Shanghai, Yangpu District Patentee after: Shanghai Fudan Communication Co.,Ltd. Address before: 200240 Dongchuan Road, Shanghai, No. 800, No. Patentee before: Shanghai Jiao Tong University |