CN104486282B - Radio frequency multicarrier intermodulation restraining device - Google Patents
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- CN104486282B CN104486282B CN201410769711.5A CN201410769711A CN104486282B CN 104486282 B CN104486282 B CN 104486282B CN 201410769711 A CN201410769711 A CN 201410769711A CN 104486282 B CN104486282 B CN 104486282B
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Abstract
The invention discloses a kind of radio frequency multicarrier intermodulation restraining device, including upconverter, low-converter, coupler, transmission line, impedance converter unit, transmission delay unit, pre-distortion unit, bandpass filter, attenuator and power amplifier.After frequency modulation multicarrier input signal upconverts to high band, by carrying out radio frequency distortion in high band, then the signal after predistortion is down-converted to former frequency range by being launched after power amplification and output bandpass filter by antenna.The device is easy to use, the intermodulation distortion of frequency modulation multi-carrier signal can be significantly reduced, it is achieved so that single output power amplifier amplifies multi-channel rf signal in the case where power does not retract, so as to reduce system bulk and complexity, save cost, reduce power consumption, it is economic and environment-friendly, it is adapted to promote the use of.
Description
Technical field
The present invention relates to a kind of RF broadcast emission system, more particularly to a kind of radio frequency multicarrier intermodulation restraining device.
Background technology
With the rapid development of China's broadcasting industry, radio frequency radio station is all constantly being set up in many broadcasting stations.Efficiently profit
With steel tower and antenna, realize that tower broadcast is a kind of inevitable choice for being effectively increased radio station number to multichannel altogether.However, multichannel it
Between can intermodulation distortion, intermodulation is as caused by device particularly amplifier nonlinearity distortion.Even-order intermodulation distortion is typically remote
It is readily filtered from IF-FRE, and the part in odd-order intermodulation distortion will abut against intermediate frequency and can not nearby filter out,
It is wherein especially maximum with third order intermodulation distortion amplitude, also maximum is influenceed, signal band can be caused to extend, cause Lin Dao to disturb.If
Have two signals, this when it is existing it is non-linear have mutually reconcile intermodulation, if the frequency of input signal is f1 and f2, then
Third order intermodulation frequency is 2f1-f2 and 2f2-f1, when f1 and f2 very close to when, intermodulation product typically also falls in channel, high-order
Intermodulation product is generally off-site from channel and readily filtered, but order intermodulation, particularly third order intermodulation then adjacent channel, it is difficult to logical
Wave filter is filtered out, and how to suppress intermodulation distortion to meet that the quality requirement of transmission signal is then a technological difficulties.Mesh
It is preceding to be realized more by the way of more emitters add radio frequency multiplexer in the industry, but this mode is bulky, it is complicated,
Construction retrofit cost is high.
The content of the invention
The purpose of the present invention is that providing one kind solves the above problems, and can make single output power amplifier in power
Amplify multi-channel rf signal in the case of not retracting, can effectively suppress the third order intermodulation interference of power amplifier, so as to effectively
Ground reduces system bulk and complexity, saves the radio frequency multicarrier intermodulation restraining device of construction retrofit cost.
To achieve these goals, the technical solution adopted by the present invention is such：A kind of radio frequency multicarrier intermodulation suppresses
Device, including be sequentially connected input upconverter, input bandpass filter, input coupler, transmission delay unit, output coupling
Clutch, output low-converter, output bandpass filter 1, power amplifier, back coupler, output bandpass filter 2, signal
From input upconverter input, exported from output bandpass filter 2；
Wherein, the output end of the input coupler is two-way, and the input of output coupler is two-way, transmission delay list
Member is exported between the input all the way of output coupler all the way positioned at input coupler, between input coupler and output coupler also
Provided with a pre-distortion unit, the pre-distortion unit both ends by the another way of impedance transformer and input coupler export and it is defeated
The another way input for going out coupler is connected；
The output end of the back coupler is two-way, all the way connection output bandpass filter 2, and another way passes through in feedback
Frequency converter, feedback bandpass filter, attenuator and impedance transformer are connected to pre-distortion unit；
Multi-carrier signal is through inputting upconverter, input bandpass filter transforms to high-frequency domain, is divided into by input coupler
Two-way, generate postpones signal by transmission delay unit all the way, it is 0dBm that the predistorted unit of another way, which generates an amplitude, phase
For 0 ° of initial pre-distorted signals, initial pre-distorted signals and postpones signal are coupled as signal all the way through output coupler, by defeated
Go out low-converter and bandpass filter 1 switches back to former frequency domain；
Switch back to the signal of former frequency domain after power amplifier amplifies, two-way, wherein a-road-through are divided into by back coupler
Feed antenna after output bandpass filter 2 filters out low-and high-frequency clutter is crossed to launch；Another way is through feeding back upconverter, feedback band logical filter
Ripple device transforms to high-frequency domain, then enters line link impedance conversion by the regulation of attenuator progress signal strength, impedance transformer successively
Matching, final feed-in pre-distortion unit；
The signal that the pre-distortion unit inputs according to input coupler and the signal fed back to, control output predistortion letter
Number, make its third order intermodulation distortion signal frequency with multi-carrier signal after power amplifier identical, opposite in phase.
As preferred：The pre-distortion unit include microprocessor, the radiofrequency signal adjuster that is connected with microprocessor and
Error quantizer；Error quantizer compares the two paths of signals of input pre-distortion unit, microprocessor is sent to after quantization, by micro-
Manage device control radiofrequency signal adjuster and export, opposite in phase identical with the actual distortion signal frequency of power amplifier third order intermodulation
Pre-distorted signals.
As preferred：The workflow of pre-distortion unit is：
（1）Signal of the definition through input coupler input is input signal, the signal inputted through attenuator is feedback signal,
The mean square error threshold value Er, pre-distorted signals amplitude peak A dBm of default input signal and feedback signal；
（2）It is 0dBm to control radiofrequency signal adjuster generation amplitude, and phase is 0 ° of initial pre-distorted signals, to inputting coupling
The signal of clutch input carries out preliminary predistortion；
（3）Error quantizer obtains input signal and feedback signal, calculates its mean square error Er', is sent into microprocessor；
（4）The mean square error Er' that microcontroller reading error quantizer is drawn, if Er' is less than or equal to predetermined threshold value
Er then completes predistortion, and otherwise controlling radiofrequency signal adjuster to sequentially generate, phase is near for step with 1 °, and amplitude is using 0.1dBm as step
The pre-distorted signals being closely stepped up carry out predistortion to input signal respectively, and mean square error Er' corresponding to reading is with presetting
Threshold value Er is compared, during once find Er' be less than or equal to Er if complete predistortion, otherwise until the phase of pre-distorted signals
Position reach 360 °, amplitude reaches default amplitude peak A dBm, then select in whole process cause mean square error Er' minimums when pair
The pre-distorted signals answered are as final pre-distorted signals.
Compared with prior art, the advantage of the invention is that：First, only need a radio frequency final stage power amplifier can amplification more
Road radiofrequency signal, system complexity substantially reduce；2nd, only input signal and faint feedback signal are processed, it is not necessary to body
The huge high power module of product so that the volume of system and cost substantially reduce really, fully adaptive, and it is more effectively to suppress radio frequency
Carrier wave intermodulation.
The present invention can effectively avoid device because it is non-linear caused by distortion, especially can abatement device third order intermodulation draw
The distorted signals risen, causes signal band to extend, the problem of causing Lin Dao to disturb.In the present invention, multi-carrier signal is through overpower
Amplifier can produce non-linear distortion, especially third order intermodulation distortion amplitude maximum, influence also maximum, it is difficult to given by wave filter
To filter out, signal band can be caused to extend, cause Lin Dao to disturb, frequency modulation multicarrier input signal is upconverted to high frequency by the present invention
Duan Hou, by carrying out radio frequency distortion in high band, then the signal after predistortion is down-converted to low frequency band and put by power
Launched after big and output bandpass filter by antenna, wherein pre-distorted signals are that the third order intermodulation exported according to power amplifier is lost
What true signal was adjusted, the third order intermodulation distortion signal of pre-distorted signals and power amplifier after adjustment, reach frequency as far as possible
Rate is identical, opposite in phase, and two signals are cancelled out each other, so as to reach the effect of intermodulation suppression.The present invention is easy to use, can be notable
Reduce the intermodulation distortion of frequency modulation multi-carrier signal so that single output power amplifier amplifies more in the case where power does not retract
Road radiofrequency signal is achieved, economic and environment-friendly so as to reduce system bulk and complexity, save cost, reduce power consumption,
It is adapted to promote the use of.
Brief description of the drawings
Fig. 1 is the theory diagram of the present invention；
Fig. 2 is the spectrogram of A points in Fig. 1；
Fig. 3 is the spectrogram of B points in Fig. 1；
Fig. 4 is the spectrogram of C points in Fig. 1；
Fig. 5 is the spectrogram of D points in Fig. 1；
Fig. 6 is the spectrogram of E points in Fig. 1；
Fig. 7 is the spectrogram of F points in Fig. 1；
Fig. 8 is the spectrogram of G points in Fig. 1；
Fig. 9 is the spectrogram of H points in Fig. 1；
Figure 10 is the spectrogram of I points in Fig. 1；
Figure 11 is the signal processing flow figure of pre-distortion unit.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Embodiment 1：Referring to Fig. 1, a kind of radio frequency multicarrier intermodulation restraining device, including the input up-conversion being sequentially connected
Device, input bandpass filter, input coupler, transmission delay unit, output coupler, output low-converter, output band logical filter
Ripple device 1, power amplifier, back coupler, output bandpass filter 2, signal is from input upconverter input, from output band logical
Wave filter 2 exports；
Wherein, the output end of the input coupler is two-way, and the input of output coupler is two-way, transmission delay list
Member is exported between the input all the way of output coupler all the way positioned at input coupler, between input coupler and output coupler also
Provided with a pre-distortion unit, the pre-distortion unit both ends by the another way of impedance transformer and input coupler export and it is defeated
The another way input for going out coupler is connected；
The output end of the back coupler is two-way, all the way connection output bandpass filter 2, and another way passes through in feedback
Frequency converter, feedback bandpass filter, attenuator and impedance transformer are connected to pre-distortion unit；
Multi-carrier signal is through inputting upconverter, input bandpass filter transforms to high-frequency domain, is divided into by input coupler
Two-way, generate postpones signal by transmission delay unit all the way, it is 0dBm that the predistorted unit of another way, which generates an amplitude, phase
For 0 ° of initial pre-distorted signals, initial pre-distorted signals and postpones signal are coupled as signal all the way through output coupler, by defeated
Go out low-converter and bandpass filter 1 switches back to former frequency domain；
Switch back to the signal of former frequency domain after power amplifier amplifies, two-way, wherein a-road-through are divided into by back coupler
Feed antenna after output bandpass filter 2 filters out low-and high-frequency clutter is crossed to launch；Another way is through feeding back upconverter, feedback band logical filter
Ripple device transforms to high-frequency domain, then enters line link impedance conversion by the regulation of attenuator progress signal strength, impedance transformer successively
Matching, final feed-in pre-distortion unit；
The signal that the pre-distortion unit inputs according to input coupler and the signal fed back to, control output predistortion letter
Number, make its third order intermodulation distortion signal frequency with multi-carrier signal after power amplifier identical, opposite in phase.
We come by taking two of frequency modulation frequency range (87MHz -108MHz) the specific frequencies for easily producing intermodulation as an example below
Illustrate how the present invention suppresses intermodulation, Fig. 2 to Fig. 9 is arrived referring to figure.
Any two that f1 and f2 can be between frequency modulation frequency range (87MHz -108MHz) in accompanying drawing is spaced in more than 500KHz
Frequency, take f1=88MHz, f2=88.5MHz here；FL is the local oscillation signal frequency of Up/Down Conversion device, takes fL=700MHz.
Referring to Fig. 1, frequency is f1=88MHz, and f2=88.5MHz dual carrier signal is defeated by the input of input upconverter
Enter, the spectrogram of input signal is as shown in Figure 2.The input signal transforms to high-frequency domain through inputting upconverter.Fig. 3 show logical
The signal spectrum figure crossed after input upconverter, wherein input signal f1=88MHz, f2=88.5MHz are mainly contained, local oscillator letter
Number fL=700MHz, frequency variation signal fL-f1=612MHz, fL-f2=611.5, fL+f1=788MHz, fL+f2=788.5MHz.From defeated
The signal feed-in input bandpass filter for entering upconverter output filters out the noise signals such as f1, f2, fL, fL-f1, fL-f2, retains
The two high-frequency signals of fL+f1 and fL+f2, referring specifically to Fig. 4.
Described above as input dual carrier signal after input upconverter, input bandpass filter transform to high-frequency domain
Situation.
The dual carrier signal for transforming to high-frequency domain is divided into two-way by input coupler.Its first via passes through transmission delay list
Member is to compensate the transmission delay as caused by pre-distortion unit；Second tunnel converts feed-in pre-distortion unit by transmission line, impedance.
Now, it is 0dBm that pre-distortion unit, which can produce an amplitude, and phase is 0 ° of initial pre-distorted signals, that is, manages
By pre-distorted signals, preliminary predistortion, initial pre-distorted signals and transmission delay list are carried out to the signal of input coupler input
After the signal of member output is coupled as all the way, down coversion returns former frequency domain, amplifies by power amplifier, is further divided into two-way, a-road-through
Cross feed antenna after output bandpass filter 2 filters out low-and high-frequency clutter to launch, all the way after up-conversion, feed back to pre-distortion unit,
The signal that the signal fed back and input coupler input is compared by pre-distortion unit, after repeatedly comparing, is ultimately produced
One stable pre-distorted signals, make it as identical with the actual distortion signal frequency of power amplifier third order intermodulation as possible, phase
Position is on the contrary, referring to Fig. 5.Fig. 5 show pre-distorted signals spectrogram, wherein including fL+2f1-f2=787.5MHz, fL+2f2-f1
Two radio-frequency components of=789MHz, the signal is after impedance conversion and transmission line by output coupler with transmission delay cell
Signal after output signal synthesis predistortion, its spectrogram are as shown in Figure 6.
Signal after the predistortion of output coupler output switches back to by output low-converter, output bandpass filter 1
Its signal spectrum of lower frequency region is as shown in fig. 7, wherein comprising input carrier signal f1=88MHz, f2=88.5MHz, pre-distorted signals
2f1-f2=87.5MHz, 2f2-f1=89MHz, its pre-distorted signals frequency are exactly equal to carrier wave f1=88MHz and f2=88.5MHz
Intermodulation frequency, the intermodulation with f1=88MHz and f2=88.5MHz is cancelled out each other by power amplifier pre-distortion signal, from
And reach the purpose of intermodulation suppression.The frequency spectrum of power amplifier output signal as shown in figure 8, wherein contain original signal f1=
88MHz, f2=88.5MHz, 2 subharmonic 2f1=176MHz, 2f2=177MHz, 3 subharmonic 3f1=264MHz, 3f2=265.5MHz
Etc. intermodulation 2f1-f2=87.5MHz, the 2f2-f1=89MHz of higher hamonic wave and amplitude very little.
The signal of power amplifier output filters out higher hamonic wave by back coupler, output bandpass filter 2 successively again
Obtain final output signal Deng clutter, its frequency spectrum is as shown in Figure 10, wherein only exist the intermodulation 2f1-f2 of amplitude very little=
87.5MHz、2f2-f1=89MHz。
Fig. 9 show the feedback signal spectrogram after transforming to high-frequency domain, and it is to enter line translation on the basis of Fig. 8.
In the present invention, how according to the third order intermodulation distortion signal of unknown power amplifier, stable predistortion is produced
Signal offsets it, and method is as follows：The radiofrequency signal correction that the pre-distortion unit includes microprocessor, is connected with microprocessor
Device and error quantizer；Error quantizer compares the two paths of signals of input pre-distortion unit, and microprocessor is sent to after quantization, by
Microprocessor control radiofrequency signal adjuster exports, phase identical with the actual distortion signal frequency of power amplifier third order intermodulation
Opposite pre-distorted signals.The workflow of pre-distortion unit is：
（1）Signal of the definition through input coupler input is input signal, the signal inputted through attenuator is feedback signal,
The mean square error threshold value Er of default input signal and feedback signal, pre-distorted signals amplitude peak A dBm, in actual modulated,
Er and A concrete numerical value can select according to actual conditions；
（2）It is 0dBm to control radiofrequency signal adjuster generation amplitude, and phase is 0 ° of initial pre-distorted signals, to inputting coupling
The signal of clutch input carries out preliminary predistortion；
（3）Error quantizer obtains input signal and feedback signal, calculates its mean square error Er', is sent into microprocessor；
（4）The mean square error Er' that microcontroller reading error quantizer is drawn, if Er' is less than or equal to predetermined threshold value
Er then completes predistortion, and otherwise controlling radiofrequency signal adjuster to sequentially generate, phase is near for step with 1 °, and amplitude is using 0.1dBm as step
The pre-distorted signals being closely stepped up carry out predistortion to input signal respectively, and mean square error Er' corresponding to reading is with presetting
Threshold value Er is compared, during once find Er' be less than or equal to Er if complete predistortion, otherwise until the phase of pre-distorted signals
Position reach 360 °, amplitude reaches default amplitude peak A dBm, then select in whole process cause mean square error Er' minimums when pair
The pre-distorted signals answered are as final pre-distorted signals.
This final pre-distorted signals, it is exactly the final caused stable signal of pre-distortion unit in the present invention.
Claims (2)
- A kind of 1. radio frequency multicarrier intermodulation restraining device, it is characterised in that：Including be sequentially connected input upconverter, input tape Bandpass filter, input coupler, transmission delay unit, output coupler, output low-converter, output bandpass filter 1, power Amplifier, back coupler, output bandpass filter 2, signal are defeated from output bandpass filter 2 from input upconverter input Go out；Wherein, the output end of the input coupler is two-way, and the input of output coupler is two-way, transmission delay unit position In exporting all the way between the input all the way of output coupler for input coupler, it is additionally provided between input coupler and output coupler One pre-distortion unit, the pre-distortion unit both ends are exported and exported coupling by the another way of impedance transformer and input coupler The another way input of clutch is connected；The output end of the back coupler is two-way, all the way connection output bandpass filter 2, and another way is by feeding back up-conversion Device, feedback bandpass filter, attenuator and impedance transformer are connected to pre-distortion unit；Multi-carrier signal is through inputting upconverter, input bandpass filter transforms to high-frequency domain, is divided into two-way by input coupler, All the way by transmission delay unit generation postpones signal, it is 0dBm that the predistorted unit of another way, which generates an amplitude, and phase is 0 ° Initial pre-distorted signals, initial pre-distorted signals and postpones signal are coupled as signal all the way through output coupler, by under output Frequency converter and bandpass filter 1 switch back to former frequency domain；Switch back to the signal of former frequency domain after power amplifier amplifies, two-way is divided into by back coupler, wherein all the way by defeated Go out feed antenna after bandpass filter 2 filters out low-and high-frequency clutter to launch；Another way is through feeding back upconverter, feedback bandpass filter High-frequency domain is transformed to, then enters line link impedance Transformation Matching by the regulation of attenuator progress signal strength, impedance transformer successively, Final feed-in pre-distortion unit；The signal that the pre-distortion unit inputs according to input coupler and the signal fed back to, control output pre-distorted signals, Make its third order intermodulation distortion signal frequency with multi-carrier signal after power amplifier identical, opposite in phase；The workflow of pre-distortion unit is：（1）Signal of the definition through input coupler input is input signal, the signal inputted through attenuator is feedback signal, is preset The mean square error threshold value Er of input signal and feedback signal, pre-distorted signals amplitude peak A dBm；（2）It is 0dBm to control radiofrequency signal adjuster generation amplitude, and phase is 0 ° of initial pre-distorted signals, to input coupler The signal of input carries out preliminary predistortion；（3）Error quantizer obtains input signal and feedback signal, calculates its mean square error Er', is sent into microprocessor；（4）The mean square error Er' that microcontroller reading error quantizer is drawn, if Er' is less than or equal to predetermined threshold value Er Complete predistortion, otherwise control radiofrequency signal adjuster to sequentially generate phase near for step with 1 °, amplitude using 0.1dBm for walk closely by Walk increased pre-distorted signals and carry out predistortion, and mean square error Er' and pre-determined threshold corresponding to reading to input signal respectively Value Er is compared, during once find Er' be less than or equal to Er if complete predistortion, otherwise until the phase of pre-distorted signals reaches To 360 °, amplitude reaches default amplitude peak A dBm, then selects corresponding when causing mean square error Er' minimums in whole process Pre-distorted signals are as final pre-distorted signals.
- 2. radio frequency multicarrier intermodulation restraining device according to claim 1, it is characterised in that：The pre-distortion unit includes Microprocessor, the radiofrequency signal adjuster being connected with microprocessor and error quantizer；Error quantizer compares input predistortion The two paths of signals of unit, microprocessor is sent to after quantization, controls the output of radiofrequency signal adjuster to be put with power by microprocessor The actual distortion signal frequency of big device third order intermodulation is identical, the pre-distorted signals of opposite in phase.
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| WO2018058619A1 (en) * | 2016-09-30 | 2018-04-05 | 华为技术有限公司 | Passive intermodulation (pim) cancellation method and device, and base station |
| CN106849970B (en) | 2016-12-29 | 2019-10-18 | 上海华为技术有限公司 | A kind of passive intermodulation suppressing method and passive intermodulation inhibit system |
| CN108494373A (en) * | 2018-05-23 | 2018-09-04 | 成都四威功率电子科技有限公司 | A kind of ultra wide band analog predistortion and device |
| CN113364473B (en) * | 2020-03-04 | 2022-12-16 | 海能达通信股份有限公司 | Digital predistortion device and transmitter |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1585264A (en) * | 2003-08-22 | 2005-02-23 | 华为技术有限公司 | Power amplifying system and method for generating pre-distortion signals |
| CN101478812A (en) * | 2008-01-03 | 2009-07-08 | 中兴通讯股份有限公司 | Digital predistortion apparatus suitable for TD-SCDMA time-division system |
| CN101527544A (en) * | 2008-03-05 | 2009-09-09 | 富士通株式会社 | Device and method for identifying inverse characteristic of nonlinear system, power amplifier and predistorter thereof |
| CN101621304A (en) * | 2009-07-27 | 2010-01-06 | 普天信息技术研究院有限公司 | Transceiver |
| CN102231620A (en) * | 2010-09-06 | 2011-11-02 | 刘郁林 | Power amplifier linearization method and device based on baseband digital predistortion technology |
| CN202513950U (en) * | 2012-03-06 | 2012-10-31 | 京信通信系统（中国）有限公司 | Self-adaptive predistortion device and frequency hopping signal transmitter |
| CN203233491U (en) * | 2013-03-06 | 2013-10-09 | 成都康特数字广播电视设备有限公司 | Radio frequency pre-distortion device for ground digital television transmitter |
-
2014
- 2014-12-15 CN CN201410769711.5A patent/CN104486282B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1585264A (en) * | 2003-08-22 | 2005-02-23 | 华为技术有限公司 | Power amplifying system and method for generating pre-distortion signals |
| CN101478812A (en) * | 2008-01-03 | 2009-07-08 | 中兴通讯股份有限公司 | Digital predistortion apparatus suitable for TD-SCDMA time-division system |
| CN101527544A (en) * | 2008-03-05 | 2009-09-09 | 富士通株式会社 | Device and method for identifying inverse characteristic of nonlinear system, power amplifier and predistorter thereof |
| CN101621304A (en) * | 2009-07-27 | 2010-01-06 | 普天信息技术研究院有限公司 | Transceiver |
| CN102231620A (en) * | 2010-09-06 | 2011-11-02 | 刘郁林 | Power amplifier linearization method and device based on baseband digital predistortion technology |
| CN202513950U (en) * | 2012-03-06 | 2012-10-31 | 京信通信系统（中国）有限公司 | Self-adaptive predistortion device and frequency hopping signal transmitter |
| CN203233491U (en) * | 2013-03-06 | 2013-10-09 | 成都康特数字广播电视设备有限公司 | Radio frequency pre-distortion device for ground digital television transmitter |
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