CN109560778A - A kind of high-speed frequency-hopping pre-distortion system and method - Google Patents
A kind of high-speed frequency-hopping pre-distortion system and method Download PDFInfo
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- CN109560778A CN109560778A CN201811578721.5A CN201811578721A CN109560778A CN 109560778 A CN109560778 A CN 109560778A CN 201811578721 A CN201811578721 A CN 201811578721A CN 109560778 A CN109560778 A CN 109560778A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3241—Modifications of amplifiers to reduce non-linear distortion using predistortion circuits
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Abstract
The invention discloses a kind of high-speed frequency-hopping pre-distortion system and methods, and the system comprises signal source, predistorter, power amplifier, predistorter Network Performance Monitor, controller, LUT table memory module, LUT table training platform and information monitoring equipment；LUT table training platform carries out a large amount of off-line training to power amplifier, generates or update LUT table；Information monitoring equipment acquires the power information and frequency information of the temperature information of power amplifier, signal source；Controller is searched pre-distortion parameters from LUT table and is configured to predistorter according to the acquisition information of information monitoring equipment, generates update table when searching less than corresponding pre-distortion parameters and is sent to LUT table training platform；Predistorter Network Performance Monitor is compared the frequency spectrum of signal source and power amplifier output signal, when error exceeds given threshold, notifies LUT table training platform.The present invention obtains the pre-distortion parameters of predistorter by way of tabling look-up, and highly shortened runing time.
Description
Technical field
The present invention relates to the predistortions of power amplifier, more particularly to a kind of high-speed frequency-hopping pre-distortion system and method.
Background technique
The problems such as being commonly encountered eavesdropping, electronic countermeasure, channel congestion due to traditional radio communication, " frequency hopping communications " can make original
First changeless radio transmission frequency is jumped with speed back and forth according to certain rules, and makes agreement other side also same by this rule
Step tracking receives.Frequency hopping communications is a kind of digital communication, is one kind of spread spectrum communication.In this communication mode, signal is passed
Radio frequency bandwidth used in defeated is tens times of original signal bandwidth, hundred times are so that thousands of times.But only with regard to certain in a flash for, it
Only work is in a certain frequency.Compared with frequency fixing communication, frequency hopping communications is also difficult to be trapped than more covert, as long as not knowing carrier frequency
The rule of jump, Content of Communication are difficult to be trapped, therefore have secret.Meanwhile even if there is part frequency point disturbed, remain to
It is normally communicated on the frequency point that other are not disturbed, therefore frequency hopping communications also has good anti-interference ability.
In frequency-hopping communication system, in order to improve output power and efficiency, radio-frequency power amplifier (abbreviation RF power amplification)
It is usually operated at inelastic region, inevitably results from three ranks and fifth order intermodulation component, is occurred stronger non-linear；Linearly
Change technology is to solve a kind of effective way of radio-frequency power amplifier nonlinear problem, is broadly divided into two major classes: simulation sum number
Word method.Simulation has analog predistortion, feedback method, non-linear components to realize linearisation (LINC) etc.；Digital method has number
Word baseband pre-distortion method.
Existing Digital base-band pre-distortion method is simple to hsrdware requirements, can be realized bandwidth performance, but due to algorithm complexity
And convergence time is longer, is not easy to realize frequency agility function.Specifically, existing digital pre-distortion technology such as look-up table, memory
Polynomial method needs enough training samples and sufficiently long training managing time to can be only achieved preferably using processing in real time
Training effect.The time is trained and handles to reduce although chip can be handled by using high performance FPGA, DSP etc.,
In wide interval frequency hopping communication system, this training time is also considerably long for the frequency hopping communications time, can in sign off
Energy predistortion effect has not been reached yet, therefore is unable to satisfy broadband frequency-hopping communication system demand.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of high-speed frequency-hopping pre-distortion system and method,
Obtain the pre-distortion parameters of predistorter by way of tabling look-up, when operation can directly read without real-time operation, greatly
Shorten runing time.
The purpose of the present invention is achieved through the following technical solutions: a kind of high-speed frequency-hopping pre-distortion system, including letter
Number source, predistorter, power amplifier, predistorter Network Performance Monitor, controller, LUT table memory module, LUT table training are flat
Platform and information monitoring equipment；
The input terminal of the predistorter is connect with signal source, carries out pre-distortion to the signal from signal source, in advance
The output end of distorter is connect with power amplifier, the signal output after being amplified by power amplifier；
The LUT table training platform obtains in setting range for carrying out a large amount of off-line training to power amplifier
Power, frequency, pre-distortion parameters corresponding to temperature generate or update LUT table, the output end and LUT table of LUT table training platform
Memory module connection, is transferred to LUT memory module for LUT table and saves；
The information monitoring equipment is used to acquire real time temperature information, the reality of power information and signal source of power amplifier
When frequency information, the output end of information monitoring equipment connect with controller；
The controller is connect with LUT table memory module and predistorter respectively, for according to receive real time temperature,
Power and frequency information search corresponding pre-distortion parameters from LUT table, match according to pre-distortion parameters to predistorter
It sets, and when searching less than corresponding pre-distortion parameters, generates and update temperature, power and the frequency of table record at this time, be transferred to LUT
Table training platform；
The predistorter Network Performance Monitor receives the signal of signal source and power amplifier output respectively, for signal
The frequency spectrum of source and power amplifier output signal is compared, and when error of spectrum exceeds given threshold, exports notification signal
LUT table training platform is given, LUT table is updated by LUT table training platform.
Wherein, the information monitoring equipment includes temperature sensor, power monitoring module and frequency detection module, the temperature
Degree sensor is used to acquire the real time temperature information of power amplifier；Power detection module is for detecting the real-time of power amplifier
Power information；The input terminal of frequency detection module is connect with signal source, and for the real-time frequency information of sensed signal sources, temperature is passed
The output end of sensor, power monitoring module and frequency detection module is connect with controller.
Wherein, the controller includes:
Lookup unit, for real time temperature, power information and frequency information that basis receives, the lookup pair from LUT table
The pre-distortion parameters answered；
Configuration unit, for being configured according to the pre-distortion parameters that find to predistorter, or search less than
When real time temperature, power information and frequency information correspond to pre-distortion parameters, immediate pre-distortion parameters are selected, to predistorter
It is configured；
Table generation unit is updated, for corresponding to predistortion ginseng less than real time temperature, power information and frequency information in lookup
When number, generates and update temperature, power and the frequency of table record at this time, be transferred to LUT table training platform.
A kind of high-speed frequency-hopping pre-distortion method, comprising the following steps:
S1.LUT table training platform carries out a large amount of off-line training to power amplifier, obtains the different function in setting range
Pre-distortion parameters corresponding to rate, frequency and temperature generate LUT table, and LUT table are saved in LUT table memory module；
Preferably, when carrying out off-line training, if training area P~P ' of training area T~T ' of temperature, power and frequency
Training area F~F ' of rate；The training pace of temperature be t, the training pace p of power and the training pace f of frequency, then:
Value range number S=(T '-the T1)/t for including in temperature training area；
Value range number K=(P '-the P1)/p for including in the training area of power；
Value range number M=(F '-the F1)/f for including in the training area of frequency；
Temperature, power, frequency have the combination of S*K*M kind value range in total；
In LUT table training platform under each combination, the pre-distortion parameters of predistorter are trained, finally
Obtain the pre-distortion parameters w (k, m, s) under each combination；
LUT table training platform by under each combination, temperature, power, frequency value range, with corresponding pre- mistake
True parameter w (k, m, s) is used as one group of data, generates LUT table, includes S*K*M group data in entire LUT table；LUT table is saved in
In LUT table memory module.
S2. when signal is transferred to power amplifier by predistorter by signal source, information monitoring equipment acquires power
Real time temperature information, the real-time frequency information of power information and signal source of amplifier, and it is transferred to controller；
S3. controller tables look-up to LUT table, can judgement according to the real time temperature, power and frequency information that receive
Find corresponding pre-distortion parameters:
If so, configuring according to the pre-distortion parameters found to predistorter, S4 is entered step；
If it is not, then choosing an immediate pre-distortion parameters, predistorter is configured, and generates update table record
Temperature, power and frequency at this time are transferred to LUT table training platform, enter step S5；
S4. predistorter Network Performance Monitor is respectively compared the frequency spectrum of signal source and power amplifier output signal,
Judge whether the pre-distortion parameters in LUT table make whether error of spectrum exceeds given threshold:
If so, exporting notification signal gives LUT table training platform, return step S1, by LUT table training platform re-start from
Line training, and LUT table is updated according to training result；
If it is not, entering step S6；
S5. predistorter Network Performance Monitor is compared the frequency spectrum of signal source and power amplifier output signal, judgement
Whether immediate pre-distortion parameters selection makes whether error of spectrum exceeds given threshold:
If so, LUT table training platform carries out off-line training according to the temperature, power and the frequency that update in table, corresponded to
Pre-distortion parameters, and by pre-distortion parameters corresponding to the temperature, power and frequency be added LUT table memory module save
In LUT table, the update of LUT table is realized, S6 is entered step after the completion of updating；
If it is not, being directly entered step S6；
S6. new signal is transferred to power amplifier by predistorter by signal source, carries out pre-distortion next time.
The beneficial effects of the present invention are: the present invention obtains the pre-distortion parameters of predistorter by way of tabling look-up, operation
When can directly read without real-time operation, highly shortened runing time；The present invention can in an abnormal situation, to LUT
Table is updated or re -training, is conducive to promote the stability that high-speed frequency-hopping pre-distortion system carries out data processing.
Detailed description of the invention
Fig. 1 is system principle diagram of the invention；
Fig. 2 is flow chart of the method for the present invention；
Fig. 3 is that the LUT in embodiment indicates to be intended to.
Specific embodiment
Technical solution of the present invention is described in further detail with reference to the accompanying drawing, but protection scope of the present invention is not limited to
It is as described below.
As shown in Figure 1, a kind of high-speed frequency-hopping pre-distortion system, including signal source, predistorter, power amplifier, pre- mistake
True device Network Performance Monitor, controller, LUT table memory module, LUT table training platform and information monitoring equipment；
The input terminal of the predistorter is connect with signal source, carries out pre-distortion to the signal from signal source, in advance
The output end of distorter is connect with power amplifier, the signal output after being amplified by power amplifier；
The LUT table training platform obtains in setting range for carrying out a large amount of off-line training to power amplifier
Power, frequency, pre-distortion parameters corresponding to temperature generate or update LUT table, the output end and LUT table of LUT table training platform
Memory module connection, is transferred to LUT memory module for LUT table and saves；
The information monitoring equipment is used to acquire real time temperature information, the reality of power information and signal source of power amplifier
When frequency information, the output end of information monitoring equipment connect with controller；
The controller is connect with LUT table memory module and predistorter respectively, for according to receive real time temperature,
Power and frequency information search corresponding pre-distortion parameters from LUT table, match according to pre-distortion parameters to predistorter
It sets, and when searching less than corresponding pre-distortion parameters, generates and update temperature, power and the frequency of table record at this time, be transferred to LUT
Table training platform；
The predistorter Network Performance Monitor receives the signal of signal source and power amplifier output respectively, for signal
The frequency spectrum of source and power amplifier output signal is compared, and when error of spectrum exceeds given threshold, exports notification signal
LUT table training platform is given, LUT table is updated by LUT table training platform.
Wherein, the information monitoring equipment includes temperature sensor, power monitoring module and frequency detection module, the temperature
Degree sensor is used to acquire the real time temperature information of power amplifier；Power detection module is for detecting the real-time of power amplifier
Power information；The input terminal of frequency detection module is connect with signal source, and for the real-time frequency information of sensed signal sources, temperature is passed
The output end of sensor, power monitoring module and frequency detection module is connect with controller.
Wherein, the controller includes:
Lookup unit, for real time temperature, power information and frequency information that basis receives, the lookup pair from LUT table
The pre-distortion parameters answered；
Configuration unit, for being configured according to the pre-distortion parameters that find to predistorter, or search less than
When real time temperature, power information and frequency information correspond to pre-distortion parameters, immediate pre-distortion parameters are selected, to predistorter
It is configured；
Table generation unit is updated, for corresponding to predistortion ginseng less than real time temperature, power information and frequency information in lookup
When number, generates and update temperature, power and the frequency of table record at this time, be transferred to LUT table training platform.
As shown in Fig. 2, a kind of high-speed frequency-hopping pre-distortion method, comprising the following steps:
S1.LUT table training platform carries out a large amount of off-line training to power amplifier, obtains the different function in setting range
Pre-distortion parameters corresponding to rate, frequency and temperature generate LUT table, and LUT table are saved in LUT table memory module；
In embodiments herein, when carrying out off-line training, if the training of the training area T~T ', power of temperature
Training area F~F ' of range P~P ' and frequency；The training pace of temperature is t, the training pace p of power and the training of frequency
Step-length f, then:
Value range number S=(T '-the T1)/t for including in temperature training area；
Value range number K=(P '-the P1)/p for including in the training area of power；
Value range number M=(F '-the F1)/f for including in the training area of frequency；
Temperature, power, frequency have the combination of S*K*M kind value range in total；
In LUT table training platform under each combination, the pre-distortion parameters of predistorter are trained, finally
Obtain the pre-distortion parameters w (k, m, s) under each combination；
LUT table training platform by under each combination, temperature, power, frequency value range, with corresponding pre- mistake
True parameter w (k, m, s) is used as one group of data, generates LUT table, includes S*K*M group data in entire LUT table；LUT table is saved in
In LUT table memory module.
As shown in figure 3, indicating to be intended to for the LUT in the embodiment, K power value range P is stored in LUT1~PK, M
A frequency value range F1~FM, S temperature value range T1~TS；Total K*M*S prestore predistorter parameter values.
In this embodiment, if the training area of temperature is -40 DEG C~80 DEG C, the training area of power is 50W~100W,
The training area of frequency is 0~100MHz；Power initial quantization step is 5W, and the initial quantization step of frequency is 5MHz, temperature
Initial quantization step be 5 DEG C；Then K=(100-50)/5=10；M=100/5=20；S={ 80- (- 40) }/5=24；In total
Then there is K*M*S=4800 value range combination, each value range combination corresponds to a pre-distortion parameters, therefore has 4800
A pre-distortion parameters.
S2. when signal is transferred to power amplifier by predistorter by signal source, information monitoring equipment acquires power
Real time temperature information, the real-time frequency information of power information and signal source of amplifier, and it is transferred to controller；
S3. controller tables look-up to LUT table, can judgement according to the real time temperature, power and frequency information that receive
Find corresponding pre-distortion parameters:
If so, configuring according to the pre-distortion parameters found to predistorter, S4 is entered step；
For example, working as realtime power Pk=57W, real-time frequency Fm=24MHz, real time temperature Ts=36 that controller receives
DEG C when, because of 57 ∈ (55,60), 24 ∈ (20,25), 36 ∈ (35,40), therefore its corresponding predistorter parameter be LUT table
In pre-stored values corresponding to [(55,60), (20,25), (35,40)].
If it is not, then choosing an immediate pre-distortion parameters according to nearby principle, predistorter is configured, and raw
At temperature, power and the frequency of table record at this time is updated, it is transferred to LUT table training platform, enters step S5；
For example, the realtime power that receives of controller is Pk=107W, real-time frequency Fm=102MHz, real time temperature is
At Ts=36 DEG C,Can not find corresponding pre-distortion parameters, thus according to will (107,102,
36) it is added and updates in table, while using nearby principle, enable Pk '=100KW, Fm '=100MHz, Ts '=36 DEG C are corresponding
Predistorter parameter is pre-stored values corresponding to [(95,100), (95,100), (35,40)] in LUT table；
S4. predistorter Network Performance Monitor is respectively compared the frequency spectrum of signal source and power amplifier output signal,
Judge whether the pre-distortion parameters in LUT table make whether error of spectrum exceeds given threshold:
If so, exporting notification signal gives LUT table training platform, return step S1, by LUT table training platform re-start from
Line training, and LUT table is updated according to training result；
If it is not, entering step S6；
For example, then return step S1, re-starts LUT table training when whether error of spectrum exceeds given threshold 10%,
Temperature, frequency and the power step size used when re -training reduces, to improve the accuracy of pre-distortion parameters.
S5. predistorter Network Performance Monitor is compared the frequency spectrum of signal source and power amplifier output signal, judgement
Whether immediate pre-distortion parameters selection makes whether error of spectrum exceeds given threshold:
If so, LUT table training platform carries out off-line training according to the temperature, power and the frequency that update in table, corresponded to
Pre-distortion parameters, and by pre-distortion parameters corresponding to the temperature, power and frequency be added LUT table memory module save
In LUT table, the update of LUT table is realized, S6 is entered step after the completion of updating；Specifically, in embodiments herein, if error
When more than given threshold 10%, for updating (107,102,36) data in table, LUT table training platform increases power first
The value range of 105~110KW increases by the value range of 100~105MHZ of frequency, the value range 35~40 with corresponding temperature
DEG C off-line training is carried out together, obtain pre-distortion parameters, LUT table is updated.
If it is not, being directly entered step S6；
S6. new signal is transferred to power amplifier by predistorter by signal source, carries out pre-distortion next time.
To sum up, the present invention obtains the pre-distortion parameters of predistorter by way of tabling look-up, when operation can directly read and
Without real-time operation, runing time highly shortened；The present invention can in an abnormal situation, LUT table is updated or
Re -training is conducive to promote the stability that high-speed frequency-hopping pre-distortion system carries out data processing.
Finally, it should be noted that the above is a preferred embodiment of the present invention, it should be understood that the present invention is not office
It is limited to form disclosed herein, should not be viewed as excluding other embodiments, and can be used for other combinations, modification and ring
Border, and can be in contemplated scope described herein, modifications can be made through the above teachings or related fields of technology or knowledge.And this
The modifications and changes that field personnel are carried out do not depart from the spirit and scope of the present invention, then all should be in appended claims of the present invention
Protection scope in.
Claims (4)
1. a kind of high-speed frequency-hopping pre-distortion system, it is characterised in that: including signal source, predistorter, power amplifier, predistortion
Device Network Performance Monitor, controller, LUT table memory module, LUT table training platform and information monitoring equipment；
The input terminal of the predistorter is connect with signal source, carries out pre-distortion, predistortion to the signal from signal source
The output end of device is connect with power amplifier, the signal output after being amplified by power amplifier；
The LUT table training platform obtains the function in setting range for carrying out a large amount of off-line training to power amplifier
Rate, frequency, pre-distortion parameters corresponding to temperature generate or update LUT table, and output end and the LUT table of LUT table training platform are deposited
Module connection is stored up, LUT table is transferred to LUT memory module and is saved；
The information monitoring equipment is used to acquire the real-time frequency of the real time temperature information of power amplifier, power information and signal source
The output end of rate information, information monitoring equipment is connect with controller；
The controller is connect with LUT table memory module and predistorter respectively, for according to real time temperature, the power received
And frequency information, corresponding pre-distortion parameters are searched from LUT table, and predistorter is configured according to pre-distortion parameters, and
When searching less than corresponding pre-distortion parameters, generates and update temperature, power and the frequency of table record at this time, be transferred to LUT table instruction
Practice platform；
The predistorter Network Performance Monitor receives the signal of signal source and power amplifier output respectively, for signal source and
The frequency spectrum of power amplifier output signal is compared, and when error of spectrum exceeds given threshold, exports notification signal to LUT
Table training platform is updated LUT table by LUT table training platform.
2. a kind of high-speed frequency-hopping pre-distortion system according to claim 1, it is characterised in that: the information monitoring equipment packet
Temperature sensor, power monitoring module and frequency detection module are included, the temperature sensor is used to acquire the reality of power amplifier
When temperature information；Power detection module is used to detect the realtime power information of power amplifier；The input terminal of frequency detection module
It is connect with signal source, for the real-time frequency information of sensed signal sources, temperature sensor, power monitoring module and frequency detecting mould
The output end of block is connect with controller.
3. a kind of high-speed frequency-hopping pre-distortion system according to claim 1, it is characterised in that: the controller includes:
Lookup unit, for being searched from LUT table corresponding according to real time temperature, power information and the frequency information received
Pre-distortion parameters；
Configuration unit, the pre-distortion parameters for finding in basis configure predistorter, or are searching less than real-time
When temperature, power information and frequency information correspond to pre-distortion parameters, immediate pre-distortion parameters are selected, predistorter is carried out
Configuration；
Table generation unit is updated, is used for when lookup corresponds to pre-distortion parameters less than real time temperature, power information and frequency information,
It generates and updates temperature, power and the frequency of table record at this time, be transferred to LUT table training platform.
4. a kind of high-speed frequency-hopping pre-distortion method, it is characterised in that: the following steps are included:
S1.LUT table training platform carries out a large amount of off-line training to power amplifier, obtain different capacity in setting range,
Pre-distortion parameters corresponding to frequency and temperature generate LUT table, and LUT table are saved in LUT table memory module；
S2. when signal is transferred to power amplifier by predistorter by signal source, information monitoring equipment acquires power amplification
Real time temperature information, the real-time frequency information of power information and signal source of device, and it is transferred to controller；
S3. controller tables look-up to LUT table according to the real time temperature, power and frequency information that receive, and can judgement search
To corresponding pre-distortion parameters:
If so, configuring according to obtained pre-distortion parameters are searched to predistorter, S4 is entered step；
If it is not, then choosing an immediate pre-distortion parameters, predistorter is configured, and generates update table record at this time
Temperature, power and frequency, be transferred to LUT table training platform, enter step S5；
S4. predistorter Network Performance Monitor is respectively compared the frequency spectrum of signal source and power amplifier output signal, judgement
Whether the pre-distortion parameters in LUT table make whether error of spectrum exceeds given threshold:
If so, exporting notification signal gives LUT table training platform, return step S1 re-starts offline instruction by LUT table training platform
Practice, and LUT table is updated according to training result；
If it is not, entering step S6；
S5. predistorter Network Performance Monitor is compared the frequency spectrum of signal source and power amplifier output signal, and judgement most connects
Whether close pre-distortion parameters selection makes whether error of spectrum exceeds given threshold:
If so, LUT table training platform carries out off-line training according to the temperature, power and the frequency that update in table, obtain corresponding pre-
Distortion parameter, and the LUT table that LUT table memory module saves is added in pre-distortion parameters corresponding to the temperature, power and frequency
In, it realizes the update of LUT table, S6 is entered step after the completion of updating；
If it is not, being directly entered step S6；
S6. new signal is transferred to power amplifier by predistorter by signal source, carries out pre-distortion next time.
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| CN109951408B (en) * | 2019-04-16 | 2021-11-09 | 苏州浪潮智能科技有限公司 | DPD output correction method, system and device |
| CN113127695A (en) * | 2020-01-16 | 2021-07-16 | 大唐移动通信设备有限公司 | Method and device for updating lookup table LUT |
| CN113127695B (en) * | 2020-01-16 | 2024-04-12 | 大唐移动通信设备有限公司 | Lookup table LUT updating method and device |
| CN112003653A (en) * | 2020-08-28 | 2020-11-27 | 中国人民解放军国防科技大学 | Method and device for testing frequency hopping frequency in built-in test of frequency hopping communication equipment |
| CN112003653B (en) * | 2020-08-28 | 2021-05-04 | 中国人民解放军国防科技大学 | Method and device for testing frequency hopping frequency in built-in test of frequency hopping communication equipment |
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