CN102065042A - Digital pre-distortion device and method - Google Patents
Digital pre-distortion device and method Download PDFInfo
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- CN102065042A CN102065042A CN201010534332XA CN201010534332A CN102065042A CN 102065042 A CN102065042 A CN 102065042A CN 201010534332X A CN201010534332X A CN 201010534332XA CN 201010534332 A CN201010534332 A CN 201010534332A CN 102065042 A CN102065042 A CN 102065042A
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Abstract
The invention discloses a digital pre-distortion device which comprises a predistorter (101), a digital-to-analog converter (DAC) (102), a quadrature modulator (QMOD) (103), an analog-to-digital converter (ADC) (110), a transducer (111), a local oscillator (LO) (109) and a power amplifier (108); and the device is characterized by also comprising an analog photoelectric/electric-optical conversion module and optical fiber (201) which is respectively connected with the quadrature modulator (QMOD) (103), the power amplifier (108) and the down-conversion mixer (111). The invention also discloses a digital predistortion method. The invention enables the circuits such as the predistorter comprising a high-speed digital signal processing chip, and the like which are originally arranged outdoors to be arranged indoors, realizes high efficiency and high linearity of the power amplifier, simplifies the circuit of remote outdoor equipment, and improves the system reliability.
Description
Technical field
The present invention relates to the digital pre-distortion technology in the wireless telecommunications headend equipment, relate in particular to a kind of digital predistortion apparatus and method.
Background technology
Along with the development of modern wireless communication technique, the user of mobile communication and traffic carrying capacity are all in sharp increase, and it is more and more crowded that communication frequency band becomes.For improving spectrum efficiency, so that the more channel of transmission in limited spectral range, generally adopted the QPSK(Quadrature Phase Shift Keying), the QAM(quadrature amplitude modulation) etc. modulation system, thereby make signal envelope produce shake inevitably, the linearity of the final stage power amplifier of system has been proposed very high requirement.In the power amplifier linearization technology of current popular, digital pre-distortion technology is subjected to paying close attention to widely and studying because of characteristics such as its adaptability is strong, wide dynamic range, bandwidths.At present, existing integrated digital pre-distortion asic chip or algorithm IP Core(intellectual property) appear on the market.
Traditional digital pre-distortion method is the radiofrequency signal with power amplifier output, and a feedback part is come out, and by down-conversion and filtering, becomes intermediate-freuqncy signal, becomes digital signal by ADC again; Simultaneously, with the digital baseband signal of power amplifier input,, compare with the digital signal of feeding back, thereby obtain the predistortion correction factor through behind the suitable time-delay.Utilize this coefficient again, the input digit baseband signal by suitable processing, with the nonlinear characteristic of compensation power amplifier, thereby is improved the linearity of whole power amplifier.
Zooming out in the headend equipment of legacy transmission link, digital predistortion circuit and power amplifier all place outdoor cabinet, make a large amount of high-speed digital signal process chip and frequency changer circuit etc. be operated in the abominable outdoor environment, its reliability makes people worried, simultaneously, outdoor unit circuit complexity also high.Under the situation of present signal bandwidth relative narrower (about 20MHz), the problems referred to above still are in acceptable scope, but along with signal bandwidth in the next generation wireless communication system is brought up to 100MHz, if continue to continue to use present pattern, the power consumption of outdoor unit, complexity all can increase substantially, and reliability can reduce.
Summary of the invention
At in traditional digital predistortion circuit, digital predistortion circuit and power amplifier all place outdoor cabinet, make a large amount of high-speed digital signal process chip and frequency changer circuit etc. be operated in the abominable outdoor environment, therefore be necessary to provide a kind of digital predistortion apparatus and method, make and originally place the outdoor circuit such as predistortion that comprise the high-speed digital signal process chip to be placed on indoor, outdoor needs to keep power amplifier unit and photoelectricity/electro-optical conversion circuit, the high efficiency that had both realized power amplifier is high linear, simplify the outdoor equipment circuit that zooms out again, improved system reliability.
The invention provides a kind of digital predistortion apparatus, it comprises predistorter 101, digital-to-analog converter DAC102, quadrature modulator QMOD103, A-D converter ADC110, frequency converter 111, local oscillator LO109 and power amplifier 108, it is characterized in that this device comprises that also analog photoelectricity/electrooptic conversion module and optical fiber 201, described analog photoelectricity/electrooptic conversion module and optical fiber 201 have annexation with described quadrature modulator QMOD103, power amplifier 108 and down-conversion mixer 111 respectively.
Preferably, described analog photoelectricity/electrooptic conversion module and optical fiber 201 comprise photoelectricity/electrooptic switching element 105, photoelectricity/electrooptic switching element 107 and optical fiber 106, and described photoelectricity/electrooptic switching element 105 is connected by optical fiber 106 with photoelectricity/electrooptic switching element 107.Described digital predistortion apparatus also comprises the 1st gain adjustment unit 104, and described quadrature modulator QMOD103 is connected in regular turn with the 1st gain adjustment unit 104, analog photoelectricity/electrooptic conversion module and optical fiber 201.Described digital predistortion apparatus also comprises the 2nd gain adjustment unit 112, and described the 2nd gain adjustment unit 112 has annexation with analog photoelectricity/electrooptic conversion module and optical fiber 201.
The present invention also provides a kind of digital pre-distortion method, and it comprises following steps:
(1) descending baseband I/Q signal is input to predistorter 101, carry out pre-distortion by predistorter, what predistorter was exported is sent into digital-to-analog converter DAC102 by the baseband I/Q signal after the predistortion, changes analog signal into, and then by quadrature modulator QMOD103 modulation;
(2) change by photoelectricity/electrooptic switching element 105 through the signal of quadrature modulator QMOD103 modulation, the conversion back is transferred to photoelectricity/electrooptic switching element 107 by optical fiber 106, photoelectricity/electrooptic switching element 107 will be transferred to power amplifier 108 after the conversion of signals, power amplifier 108 amplifies back output 302;
(3) output radiofrequency signal 302, except outputing to antenna, also be coupled on a small quantity and fed back, by 107 conversions of photoelectricity/electrooptic switching element, the conversion back is transferred to photoelectricity/electrooptic switching element 105 by optical fiber 106, output to frequency converter 111 after 105 conversions of photoelectricity/electrooptic switching element and change to intermediate frequency, after ADC110 is sampled as digital signal, send into predistorter 101 again;
Preferably, after the 1st gain adjustment unit 104 is adjusted signal levels, be transferred to 105 conversions of photoelectricity/electrooptic switching element through the signal of quadrature modulator QMOD103 modulation.The signal that is coupled and feeds back is transferred to 107 conversions of photoelectricity/electrooptic switching element after the 2nd gain adjustment unit 112 is adjusted signal levels.Predistortion controller 101 detects the channel time delay of being introduced by optical fiber, and compensation automatically, finishes pre-distortion.
Beneficial effect of the present invention: between power amplifier and predistortion circuit, insert photoelectricity/electrical to optical converter and optical fiber, make downlink radio-frequency signal and feedback signal in optical fiber, transmit by the mode of wavelength division multiplexing, predistorter is according to fiber lengths, automatically the time delay of compensated fiber introducing is finished pre-distortion, and power amplifier and digital pre-distortion part are separated from physical distance, realized zooming out of power amplifier unit, also simplified circuit, reduce cost and created condition for power amplifier unit.Adopt the solution of the present invention, can make and originally place the outdoor circuit such as predistortion that comprise the high-speed digital signal process chip to be placed on indoor, outdoor needs to keep power amplifier unit and photoelectricity/electro-optical conversion circuit, the high efficiency that had both realized power amplifier is high linear, simplify the outdoor equipment circuit that zooms out again, improved system reliability.
Figure of description
Fig. 1 is traditional digital predistortion circuit block diagram;
Fig. 2 is a digital predistortion circuit block diagram of the present invention.
Embodiment
Specify the specific embodiment of the present invention below in conjunction with Figure of description.
Traditional digital predistortion circuit block diagram as shown in Figure 1, its operation principle is: input baseband I/Q signal 400 enters predistorter 401, by comparing feedback signal from ADC405, generate the predistortion correction factor and carry out pre-distortion, outputed to DAC402 by the signal after the pre-distortion and become analog signal, this analog signal is modulated to radio frequency by QMOD403 again, amplifies back output by PA404 then; Simultaneously, the output of PA404 is coupled a part to Mixer406, becomes intermediate-freuqncy signal, is become digital signal and delivers to predistortion module 401 by ADC405.LO407 provides required local oscillation signal for Mixer406 and QMOD403.
Digital predistortion circuit block diagram of the present invention as shown in Figure 2, it comprises predistorter 101, digital-to-analog converter DAC102, quadrature modulator QMOD103, A-D converter ADC110, frequency converter 111, local oscillator LO109 and power amplifier 108, it is characterized in that this device comprises that also analog photoelectricity/electrooptic conversion module and optical fiber 201, described analog photoelectricity/electrooptic conversion module and optical fiber 201 have annexation with described quadrature modulator QMOD103, power amplifier 108 and down-conversion mixer 111 respectively.
Preferably, described analog photoelectricity/electrooptic conversion module and optical fiber 201 comprise photoelectricity/electrooptic switching element 105, photoelectricity/electrooptic switching element 107 and optical fiber 106, described photoelectricity/electrooptic switching element 105 is connected by optical fiber 106 with photoelectricity/electrooptic switching element 107, photoelectricity/electrooptic switching element 105 and photoelectricity/electrooptic switching element 107 always occur in pairs, and light signal transmits in the mode of wavelength division multiplexing in optical fiber (106).Described digital predistortion apparatus also comprises the 1st gain adjustment unit 104, and described quadrature modulator QMOD103 is connected in regular turn with the 1st gain adjustment unit 104, analog photoelectricity/electrooptic conversion module and optical fiber 201.Described digital predistortion apparatus also comprises the 2nd gain adjustment unit 112, and described the 2nd gain adjustment unit 112 has annexation with analog photoelectricity/electrooptic conversion module and optical fiber 201.Predistorter 101 generates the predistortion correction factor and finishes pre-distortion, the both available ASIC(special chip of predistorter 101), also available FPGA(programmable gate array) realize.
The operation principle of a kind of digital predistortion apparatus provided by the invention is as follows: descending baseband I/Q inphase/orthogonal signal 301 is input to predistorter 101, carry out pre-distortion by predistorter, with the non-linear distortion that brings of compensation power amplifier, what predistorter was exported is sent into DAC digital-to-analog converter 102 by the baseband I/Q signal after the predistortion, change analog signal into, and then be modulated to radio frequency by QMOD quadrature modulator 103, and after gain adjustment unit 104 is adjusted signal level, be transferred to optical fiber 106 by photoelectricity/electrooptic switching element 105, optical fiber 106 is transferred to photoelectricity/electrooptic switching element 107 transmission backs and gives power amplifier 108, and power amplifier 108 amplifies back output 302.Output radiofrequency signal 302, except outputing to antenna, also be coupled on a small quantity and fed back, after gain adjustment unit 112 is adjusted signal level, be transferred to optical fiber 106 by photoelectricity/electrooptic switching element 107, optical fiber 106 is transferred to photoelectricity/electric light conversion 105 and outputs to frequency converter Mixer111 and change to intermediate frequency, sends into predistorter 101 again after ADC110 is sampled as digital signal.
The present invention also provides a kind of digital pre-distortion method, and it comprises following steps:
(1) descending baseband I/Q signal is input to predistorter 101, carry out pre-distortion by predistorter, what predistorter was exported is sent into digital-to-analog converter DAC102 by the baseband I/Q signal after the predistortion, changes analog signal into, and then by quadrature modulator QMOD103 modulation;
(2) change by photoelectricity/electrooptic switching element 105 through the signal of quadrature modulator QMOD103 modulation, the conversion back is transferred to photoelectricity/electrooptic switching element 107 by optical fiber 106, photoelectricity/electrooptic switching element 107 will be transferred to power amplifier 108 after the conversion of signals, power amplifier 108 amplifies back output 302;
(3) output radiofrequency signal 302, except outputing to antenna, also be coupled on a small quantity and fed back, by 107 conversions of photoelectricity/electrooptic switching element, the conversion back is transferred to photoelectricity/electrooptic switching element 105 by optical fiber 106, output to frequency converter 111 after 105 conversions of photoelectricity/electrooptic switching element and change to intermediate frequency, after ADC110 is sampled as digital signal, send into predistorter 101 again.
Preferably, after the 1st gain adjustment unit 104 is adjusted signal levels, be transferred to 105 conversions of photoelectricity/electrooptic switching element through the signal of quadrature modulator QMOD103 modulation.The signal that is coupled and feeds back is transferred to 107 conversions of photoelectricity/electrooptic switching element after the 2nd gain adjustment unit 112 is adjusted signal levels.Predistortion controller 101 detects the channel time delay of being introduced by optical fiber, and compensation automatically, finishes pre-distortion.
Comparison diagram 1 and Fig. 2 as can be seen, the present invention and existing digital predistortion circuit have following characteristics:
(1) between original power amplifier and pre-distortion unit, inserts photoelectricity/electric light module and optical fiber, make and originally place the outdoor circuit such as predistortion that comprise the high-speed digital signal process chip to be placed on indoor, outdoor needs to keep power amplifier unit and photoelectricity/electro-optical conversion circuit, the high efficiency that had both realized power amplifier is high linear, has simplified the outdoor equipment circuit that zooms out again;
(2) in predistorter,, and compensate it by the time delay of measuring optical fiber introducing;
(3) by gain adjustment unit, keep rational optical module radio frequency incoming level;
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (8)
1. digital predistortion apparatus, it comprises predistorter (101), digital-to-analog converter DAC(102), quadrature modulator QMOD(103), A-D converter ADC(110), frequency converter (111), local oscillator LO(109) and power amplifier (108), it is characterized in that this device also comprise analog photoelectricity/electrooptic conversion module and optical fiber (201), described analog photoelectricity/electrooptic conversion module and optical fiber (201) respectively with described quadrature modulator QMOD(103), power amplifier (108) and down-conversion mixer (111) have annexation.
2. digital predistortion apparatus as claimed in claim 1, it is characterized in that described analog photoelectricity/electrooptic conversion module and optical fiber (201) comprise photoelectricity/electrooptic switching element (105), photoelectricity/electrooptic switching element (107) and optical fiber (106), described photoelectricity/electrooptic switching element (105) is connected by optical fiber (106) with photoelectricity/electrooptic switching element (107).
3. digital predistortion apparatus as claimed in claim 2, it is characterized in that described digital predistortion apparatus also comprises the 1st gain adjustment unit (104), described quadrature modulator QMOD(103) be connected in regular turn with the 1st gain adjustment unit (104), analog photoelectricity/electrooptic conversion module and optical fiber (201).
4. as claim 1 or 2 or 3 described digital predistortion apparatus, it is characterized in that it being that described digital predistortion apparatus also comprises the 2nd gain adjustment unit (112), described the 2nd gain adjustment unit (112) has annexation with analog photoelectricity/electrooptic conversion module and optical fiber (201).
5. digital pre-distortion method, it comprises following steps:
(1) descending baseband I/Q signal is input to predistorter (101), carry out pre-distortion by predistorter, what predistorter was exported is sent into digital-to-analog converter DAC(102 by the baseband I/Q signal after the predistortion), change analog signal into, and then by quadrature modulator QMOD(103) modulation;
(2) through quadrature modulator QMOD(103) signal of modulation is by photoelectricity/electrooptic switching element (105) conversion, the conversion back is transferred to photoelectricity/electrooptic switching element (107) by optical fiber (106), photoelectricity/electrooptic switching element (107) will be transferred to power amplifier (108) after the conversion of signals, power amplifier (108) amplifies back output (302);
(3) output radiofrequency signal (302), except outputing to antenna, also be coupled on a small quantity and fed back, change by photoelectricity/electrooptic switching element (107), the conversion back is transferred to photoelectricity/electrooptic switching element (105) by optical fiber (106), output to frequency converter (111) after photoelectricity/electrooptic switching element (105) conversion and change to intermediate frequency, again through ADC(110) send into predistorter (101) after being sampled as digital signal.
6. digital pre-distortion method as claimed in claim 5 is characterized in that through quadrature modulator QMOD(103) signal of modulation after the 1st gain adjustment unit (104) is adjusted signal level, be transferred to photoelectricity/electrooptic switching element (105) conversion.
7. digital pre-distortion method as claimed in claim 6, it is characterized in that being coupled and the signal that feeds back after the 2nd gain adjustment unit (112) is adjusted signal level, be transferred to photoelectricity/electrooptic switching element (107) conversion.
8. digital pre-distortion method as claimed in claim 7 is characterized in that predistortion controller (101) detects the channel time delay of being introduced by optical fiber, and compensation automatically, finishes pre-distortion.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437982A (en) * | 2011-11-28 | 2012-05-02 | 电子科技大学 | Digital pre-distortion system and method |
| CN102638228A (en) * | 2012-03-09 | 2012-08-15 | 北京创毅讯联科技股份有限公司 | Up-converter and up-conversion method |
| CN102868371A (en) * | 2012-04-01 | 2013-01-09 | 武汉邮电科学研究院 | Digital pre-distortion verification system and method of radio frequency power amplifier |
| CN109428610A (en) * | 2017-08-29 | 2019-03-05 | 华为技术有限公司 | Feedback circuit unit, ROF wireless transmitter and the method for eliminating non-linear distortion |
| CN111669196A (en) * | 2019-03-05 | 2020-09-15 | 瑞昱半导体股份有限公司 | Device for processing signals |
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| CN201274476Y (en) * | 2008-09-18 | 2009-07-15 | 京信通信系统（中国）有限公司 | Digital optical fiber repeater system |
| US20090196630A1 (en) * | 2008-02-05 | 2009-08-06 | Applied Optoelectronics, Inc. | Distortion Compensation Circuit Including One or More Phase Invertible Distortion Paths |
| 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 |
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| US20090196630A1 (en) * | 2008-02-05 | 2009-08-06 | Applied Optoelectronics, Inc. | Distortion Compensation Circuit Including One or More Phase Invertible Distortion Paths |
| 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 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102437982A (en) * | 2011-11-28 | 2012-05-02 | 电子科技大学 | Digital pre-distortion system and method |
| CN102638228A (en) * | 2012-03-09 | 2012-08-15 | 北京创毅讯联科技股份有限公司 | Up-converter and up-conversion method |
| CN102868371A (en) * | 2012-04-01 | 2013-01-09 | 武汉邮电科学研究院 | Digital pre-distortion verification system and method of radio frequency power amplifier |
| CN102868371B (en) * | 2012-04-01 | 2015-05-20 | 武汉邮电科学研究院 | Digital pre-distortion verification system and method of radio frequency power amplifier |
| CN109428610A (en) * | 2017-08-29 | 2019-03-05 | 华为技术有限公司 | Feedback circuit unit, ROF wireless transmitter and the method for eliminating non-linear distortion |
| CN109428610B (en) * | 2017-08-29 | 2020-10-16 | 华为技术有限公司 | Feedback circuit unit, ROF wireless transmitter and method for eliminating nonlinear distortion |
| CN111669196A (en) * | 2019-03-05 | 2020-09-15 | 瑞昱半导体股份有限公司 | Device for processing signals |
| CN111669196B (en) * | 2019-03-05 | 2021-07-16 | 瑞昱半导体股份有限公司 | Device for processing signals |
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| CN102065042B (en) | 2014-06-11 |
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