WO2019010630A1 - 一种信号校正方法以及信号校正系统 - Google Patents

一种信号校正方法以及信号校正系统 Download PDF

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Publication number
WO2019010630A1
WO2019010630A1 PCT/CN2017/092491 CN2017092491W WO2019010630A1 WO 2019010630 A1 WO2019010630 A1 WO 2019010630A1 CN 2017092491 W CN2017092491 W CN 2017092491W WO 2019010630 A1 WO2019010630 A1 WO 2019010630A1
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Prior art keywords
signal
modulated signal
envelope
correction system
imbalance
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PCT/CN2017/092491
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English (en)
French (fr)
Inventor
王俊鹏
王炜
纪腾腾
庞彦钊
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201780045526.3A priority Critical patent/CN109496397B/zh
Priority to EP17917271.3A priority patent/EP3605865B1/en
Priority to PCT/CN2017/092491 priority patent/WO2019010630A1/zh
Publication of WO2019010630A1 publication Critical patent/WO2019010630A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver

Definitions

  • the embodiments of the present application relate to the field of communications, and in particular, to a signal correction method and a signal correction system.
  • the RF receiver is located at the forefront of the wireless communication system, and its structure and performance directly affect the entire communication system of the electronic product world. Optimizing the design structure and selecting the right manufacturing process to improve the system's performance and price ratio is the direction that RF engineers are pursuing.
  • the zero (near zero) intermediate frequency system has the characteristics of small size, low cost and easy monolithic integration, it has received extensive attention in the field of wireless communication.
  • the zero (near zero) IF system has been characterized by small size and monolithic integration, which has caused local oscillator leakage and image leakage in the zero (near zero) IF system. The leakage of the local oscillator signal and the image signal may cause the residual of the local oscillator signal and the image signal to be large, which may deteriorate the signal-to-noise ratio of the signal of the communication unit or affect other communication units.
  • the link includes a modulator, a variable gain amplifier (VGA), a power amplifier (PA), and the like. Envelope detection tube after PA.
  • the modulator is configured to modulate an input signal to obtain a modulated signal; the VGA and the PA are configured to perform power gain adjustment on the modulated signal and then output through the PA; the envelope detector samples an envelope information output by the modulator, The extraction of the correction information is implemented, and then corrected by a quadrature modulation compensation (QMC) algorithm.
  • QMC quadrature modulation compensation
  • the gain adjustment of the VGA and the PA in the modulation signal outputted by the modulator is a dynamic process, and the power of the modulated signal output by the PA exceeds the envelope detector during the adjustment process.
  • the working power which causes the envelope detector tube to not work properly.
  • the embodiment of the present application provides a signal correction method and a signal correction system for performing dynamic gain compensation on a modulated signal of a link after a link, so that the power of the modulated signal satisfies the operating power of the envelope detector, thereby ensuring the The envelope detector can continue to operate normally, thereby performing orthogonal imbalance correction on the modulated signal.
  • an embodiment of the present application provides a signal correction method, including:
  • the signal correction system modulates the input signal to output a modulated signal; the signal correction system then power amplifies the modulated signal to obtain a first modulated signal; and then the signal correcting system modulates the first portion of the first modulated signal Performing power compensation to obtain a second modulated signal, the first partial modulated signal being one of at least two partial modulated signals into which the first modulated signal is copied, the power of the second modulated signal satisfying a first envelope detector Operating power; and then, the signal correction system acquires first envelope information indicating amplitude and phase imbalance and DC imbalance of the modulated signal and spatial leakage information of the image signal of the modulated signal and the local oscillator signal; The signal correction system calculates a quadrature imbalance correction coefficient based on the first envelope information; finally, the signal correction system corrects the modulation signal of the modulator according to the orthogonal imbalance correction coefficient.
  • the first envelope detector may be an envelope detection tube or a spectrum analyzer, as long as the envelope information can be collected, and the specific manner is not limited herein.
  • the specific process of the signal correction system calculating the orthogonal imbalance correction coefficient according to the first envelope information and correcting the modulation signal by using the orthogonal imbalance correction coefficient is as follows: first, detecting the envelope The signal obtained by the feedback is digitally processed, the delay and amplitude of the feedback signal are adjusted, and the reference signal is matched, and then the difference between the feedback signal and the reference signal is compared, thereby solving the orthogonal imbalance correction coefficient, and then the orthogonality is not used.
  • the balance correction factor adjusts the amplitude, phase, and DC information of the modulated signal to achieve correction of the modulator and spatial leakage amplitude imbalance.
  • the signal correction system performs dynamic gain compensation on the first modulated signal according to the power amplification result of the first modulated signal to obtain a second modulated signal, so that the power of the second modulated signal conforms to the first envelope.
  • the operating power of the detector ensures that the first envelope detector can continue to operate normally, thereby performing orthogonal imbalance correction on the modulated signal.
  • the signal correction system may perform orthogonal imbalance correction on the modulated signal in the following manner, as follows:
  • the signal correction system acquires second amplitude envelope information for indicating amplitude and phase imbalance and DC imbalance of the modulated signal; and then the signal correction system calculates the first of the second envelope detector according to the second envelope information a correction coefficient; the signal correction system calculates a spatial leakage factor of the modulated signal image signal and the local oscillator signal according to the first envelope information and the second envelope information; and finally the signal correction system utilizes the spatial leakage factor A correction coefficient is compensated to obtain the orthogonal imbalance correction coefficient.
  • the signal correction system uses the first envelope information to calculate the orthogonal imbalance correction coefficient, and the signal correction system adopts the first envelope information and the second packet.
  • the calculation method used when calculating the orthogonal imbalance correction coefficient is the same. That is, the calculation process of the signal correction system when calculating the orthogonal imbalance correction coefficient using only the first envelope information is as follows:
  • the signal correction system first calculates a correction coefficient according to the amplitude and phase imbalance of the modulated signal and the DC imbalance; and then the signal correction system calculates the space according to the amplitude and phase imbalance, the DC imbalance and the space leakage information of the modulated signal. a leakage factor; finally, the signal correction system compensates the correction coefficient according to the spatial leakage factor to obtain the orthogonal imbalance correction coefficient.
  • the signal correction system collects the second envelope information, and calculates the orthogonal imbalance correction coefficient according to the second envelope information and the first envelope information, so that the calculation is positive.
  • the calculation step can be saved in the process of unbalance correction coefficient, so that the correction speed can be effectively improved.
  • the signal correction system may further perform orthogonal imbalance correction on the modulated signal by using the following scheme, as follows:
  • the signal correction system calculates the spatial leakage factor according to the first envelope information and the second envelope information
  • the spatial leakage factor is saved, and the first envelope detector stops running and starts a timer; After the timer has passed the preset duration, the first envelope detector starts to run.
  • the signal correction system acquires the second envelope information collected by the second envelope detector in real time (it can be understood that the second envelope information does not refer to Envelope information of a fixed time, which is used to refer to the second envelope detector to obtain different envelope information), and calculates the first correction coefficient according to the second envelope information; then the signal correction system is based on The saved spatial leakage factor compensates for the first correction coefficient The orthogonal imbalance correction coefficient is obtained.
  • the signal correction system may freeze the link gain and the orthogonal imbalance correction coefficient at the current time while the first envelope detector is activated (ie, the current time does not orthogonalize the modulated signal). Unbalance correction), then the first envelope detector collects the first envelope information of the modulated signal at the current moment (it can be understood that the first envelope information does not refer to the envelope information of the fixed moment, and it uses Refers to the different envelope information acquired by the first envelope detector). At this time, the signal correction system acquires the second envelope information of the modulation signal acquired by the second envelope detector at the current time.
  • the signal correction system calculates a spatial leakage factor of the current time according to the first envelope information of the current time and the second envelope information of the current time; the signal correction system calculates the second envelope information according to the current time. The first correction factor at the current time. Finally, the signal correction system compensates the first correction coefficient of the current time by using the spatial leakage factor of the current time to obtain the orthogonal imbalance correction coefficient of the current time.
  • the signal correction system may further determine whether the power range of the first modulated signal is within a preset range, and if so, the first envelope The detector starts running.
  • the first envelope detector performs periodic work, which can effectively improve the correction speed of the signal correction system.
  • the first envelope detector operates in a differential form.
  • the first envelope detector is connected in the signal correction system in a differential manner, which can effectively improve the anti-leakage interference capability of the first envelope detector of the DPD feedback channel, and avoid the orthogonal unbalanced space.
  • the leakage factor causes secondary pollution.
  • an embodiment of the present application provides a signal correction system having a function of implementing a signal correction system in the above method.
  • This function can be implemented in hardware or in hardware by executing the corresponding software.
  • the hardware or software includes one or more modules corresponding to the functions described above.
  • the signal correction system includes:
  • a modulation module for modulating the input signal to output a modulated signal
  • a power adjustment module configured to amplify power of the modulated signal to obtain a first modulated signal
  • a compensation module configured to perform power compensation on the first partial modulated signal of the first modulated signal to obtain a second modulated signal, where a power of the second modulated signal satisfies an operating power of the first envelope detector, the first partial modulation
  • the signal is one of at least two partial modulated signals into which the first modulated signal is copied;
  • the acquiring module is configured to acquire the first envelope information, where the first envelope information is used to indicate amplitude and phase imbalance and DC imbalance of the modulated signal, and spatial leakage of the image signal and the local oscillator signal of the modulated signal;
  • a correction module configured to calculate a quadrature imbalance correction coefficient according to the first envelope information; and correct the modulation signal by using the orthogonal imbalance correction coefficient.
  • the signal correction system includes:
  • a modulator a first variable gain adjuster, a digital predistortion correction DPD feedback channel, and a corrector
  • the DPD feedback channel includes: a first envelope detector, a second variable gain adjuster, and a power splitter;
  • the modulator is configured to modulate the input signal to output a modulated signal
  • the first variable gain adjuster is configured to amplify the power of the modulated signal to obtain a first modulated signal, and the first a modulated signal is output to the second variable gain adjuster;
  • the power splitter is configured to copy the first modulated signal into at least two partial modulated signals, and send the first partial modulated signal to the second variable gain adjuster;
  • the second variable gain adjuster is configured to compensate the power of the first partial modulated signal to obtain a second modulated signal, wherein a power of the second modulated signal satisfies an operating power of the first envelope detector;
  • the first envelope detector is configured to collect first envelope information, where the first envelope information is used to indicate amplitude and phase imbalance and DC imbalance of the modulated signal, and an image signal and a local oscillator signal of the modulated signal Space leak information;
  • the corrector is configured to calculate a quadrature imbalance correction coefficient according to the amplitude imbalance, the DC imbalance, and the spatial leakage information; and correct the modulation signal of the modulator by using the orthogonal imbalance correction coefficient.
  • an embodiment of the present application provides a computer readable storage medium, including instructions, when the instruction is run on a computer, the computer executes the foregoing methods.
  • an embodiment of the present application provides a computer program product comprising instructions, when the computer program product runs on a computer, the computer executes the foregoing methods.
  • the signal correction system performs dynamic gain compensation on the power of the partial signal of the first modulated signal according to the power amplification result of the first modulated signal to obtain a second modulated signal, so that the second modulation
  • the power of the signal conforms to the operating power of the first envelope detector, ensuring that the first envelope detector can continue to operate normally, thereby performing orthogonal imbalance correction on the modulated signal.
  • FIG. 1 is a schematic diagram of a prior art in an embodiment of the present application.
  • FIG. 2 is a schematic diagram of an embodiment of a signal correction method in an embodiment of the present application.
  • FIG. 3 is a schematic diagram of a signal correction system in an embodiment of the present application.
  • FIG. 4 is a schematic diagram of another embodiment of a signal correction method according to an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a signal correction system according to an embodiment of the present application.
  • FIG. 6 is a schematic diagram of an embodiment of a signal correction system in an embodiment of the present application.
  • FIG. 7 is a schematic diagram of another embodiment of a signal correction system in an embodiment of the present application.
  • the embodiment of the present application provides a signal correction method and a signal correction system, which are used for dynamic gain compensation of a modulated signal of a link after a link, so that the power of the modulated signal satisfies the working power of the envelope detector, thereby ensuring the package.
  • the network detector can continue to work normally, thereby performing orthogonal imbalance correction on the modulated signal.
  • the zero (near zero) IF system has been characterized by small size and monolithic integration, which has caused local oscillator leakage and image leakage in the zero (near zero) IF system.
  • the local oscillator leakage will interfere with the adjacent channel signal.
  • a method as shown in FIG. 1 which includes a modulator, a VGA, a PA, and an envelope detector after the PA.
  • the modulator is configured to modulate an input signal to obtain a modulated signal; the VGA and the PA are configured to perform power gain adjustment on the modulated signal and then output through the PA; the envelope detector samples an envelope information output by the modulator, The extraction of the correction information is implemented, and then corrected by a quadrature modulation compensation (QMC) algorithm.
  • QMC quadrature modulation compensation
  • the embodiment of the present application provides the following technical solution: the signal correction system modulates an input signal to output a modulated signal; and then the signal correction system performs power amplification on the modulated signal to obtain a first modulated signal; and then The signal correction system performs power compensation on a portion of the signal of the first modulated signal to obtain a second modulated signal, the power of the second modulated signal satisfies the operating power of the first envelope detector; and then, the signal correction system acquires the Determining amplitude and phase imbalance of the modulated signal and first envelope information of the image signal of the modulated signal and spatial leakage information of the local oscillator signal; and then the signal correction system calculates the first envelope information according to the first envelope information Orthogonal imbalance correction coefficient; finally, the signal correction system corrects the modulation signal of the modulator according to the orthogonal imbalance correction coefficient.
  • an embodiment of the signal correction method in the embodiment of the present application includes:
  • the signal correction system modulates the input signal to obtain a modulated signal.
  • the signal correction system modulates the input signal to obtain a modulated signal.
  • the signal correction system includes a modulator, a first VGA, a PA, a coupler, a second VGA, and the first envelope detector;
  • the coupler, the second VGA and the first envelope detector are included in the DPD feedback channel.
  • the signal correction system modulates the input signal by the modulator to generate a modulated signal.
  • the signal correction system performs power amplification on the modulated signal to obtain a first modulated signal.
  • the signal correction system power-amplifies the modulated signal to obtain the first modulated signal.
  • the signal correction system needs to perform power amplification on the modulated signal and then use the output.
  • the signal correction system shown in FIG. 3 can perform power amplification on the modulated signal by the first VGA and the PA to obtain the first modulated signal, wherein the first VGA can be used to determine the modulation.
  • the amplification amplitude of the signal (such as the power amplification range of the modulated signal is 0 dB to 30 dB), and then the PA realizes the final amplification power of the modulated signal and outputs (for example, the maximum power required for output in the system should be 60 dB, Then, when the first VGA reaches a gain of 30 decibels, the PA also needs to amplify the power by 30 decibels to 60 decibels).
  • the functions implemented by the first VGA and the PA in the signal correction system may also be implemented by other devices that can implement variable power adjustment.
  • the first VGA may be composed of a frequency converter and a fixed amplifier, as long as The gain of the modulation signal can be changed, and the specific device is not limited herein.
  • the function of the second VGA can also be implemented by a frequency converter and a fixed amplifier, and the specific device is not limited herein.
  • the first calibration signal of the first modulation signal is compensated by the signal correction system to obtain a second modulation signal, where the power of the second modulation signal satisfies the operating power of the first envelope detector.
  • the signal correction system performs gain compensation on the first partial modulated signal of the first modulated signal to obtain a second modulated signal whose power satisfies the operating power of the first envelope detector.
  • the signal correction system copies the first modulated signal into at least two partial modulated signals, and then selects the first partial modulated signal (ie, one of the at least two partial modulated signals) for signal feedback.
  • the operating power of the first envelope detector is a predetermined power range
  • the power of the second modulated signal is only within the predetermined power range.
  • the envelope detector has a working range of 5 decibels to 10 decibels, that is, the power of the second modulated signal is greater than or equal to 5 decibels and less than or equal to 10 decibels.
  • the first envelope detector may be an envelope detector or a spectrum analyzer, as long as the envelope information can be collected, which is not limited herein.
  • the coupler performs power allocation on the first modulated signal output by the PA, that is, the signal transmitted to the second VGA through the coupler is already power.
  • the attenuated signal is then compensated by the second VGA to compensate the signal transmitted by the coupler to satisfy the operating power of the first envelope detector to obtain the second modulated signal.
  • the first VGA has a gain range of 20 decibels
  • the power range amplified by the PA is 50 decibels
  • the power range of the signal obtained by the coupler is 5 decibels
  • the operating power of the first envelope detector tube is At 8 decibels
  • the second VGA has a gain range of 3 decibels and is then output.
  • the gain direction of the first VGA and the second VGA is opposite, that is, the gain trend of the first VGA is opposite to the gain trend of the second VGA.
  • the first VGA has a gain range of 0 decibels to 30 decibels
  • the power range amplified by the PA is 30 decibels to 60 decibels
  • the power range of the signal obtained by the coupler is 3 decibels to 6 decibels
  • the The first envelope detector has an operating power of 8 decibels
  • the second VGA has a gain range of 5 decibels to 2 decibels. That is, the gain trend of the first VGA is from small to large, and the gain trend of the second VGA is from large to small.
  • the first envelope detector tube can be connected to the signal correction system in a differential manner as shown in FIG.
  • the first envelope detector tube is also unaffected.
  • the signal correction system collects first envelope information, where the first envelope information is used to indicate amplitude and phase imbalance of the modulated signal, DC imbalance, and spatial leakage information of the modulated signal image signal and the local oscillator signal.
  • the signal correction system acquires first envelope information of the modulated signal, the first envelope information is used to indicate amplitude and phase imbalance of the modulated signal, DC imbalance, and spatial leakage of the image signal of the modulated signal and the local oscillator signal information.
  • the first envelope detecting tube is located after the second VGA, and the second envelope signal of the first envelope detecting tube is outputted by the second VGA.
  • the power starts to work within a preset range (ie, the power is stable).
  • the modulated signal passes the gain adjustment of the second VGA to obtain the second modulated signal, since the power of the second modulated signal satisfies the operating power of the first envelope detector, the first envelope detector can work normally. . Since it is located at the rear stage of the entire modulation link, that is, after the PA, the first envelope detector can be collected.
  • the signal correction system may save the first envelope information or save the positive calculated according to the first envelope information. Transmitting the imbalance correction coefficient, then causing the first envelope detector to temporarily stop working and starting the timer, and then after the timer exceeds the preset period of time, the signal correction system starts the first envelope detector again; The first envelope detector tube again acquires envelope information of the modulated signal. During the timing of the timer, the signal correction system may calculate the orthogonal imbalance correction coefficient according to the saved first envelope information or directly acquire the saved orthogonal imbalance correction coefficient.
  • the time when the first envelope detecting tube stops working is used as the starting time, and the signal correcting system starts the timer; then the signal correcting system determines whether the timer duration of the timer has been a preset duration; If the timer duration of the timer exceeds the preset duration, the signal correction system freezes the use of the current link gain and the current quadrature imbalance correction coefficient and activates the first envelope detector; the signal correction system then reads The current envelope information collected by the first envelope detector tube; finally, the signal correction coefficient calculates a current orthogonal imbalance correction coefficient according to the current envelope information. If the timer duration of the timer does not exceed the preset duration, the signal correction coefficient directly acquires the envelope information collected before the first envelope detector stops working or directly acquires the first envelope detector before stopping the operation. Calculated quadrature imbalance correction factor.
  • the signal correction coefficient may use the timer or the timing accumulator, as long as the periodic judgment can be performed, and the specific manner is adopted, and no processing is performed here.
  • the signal correction system calculates a quadrature imbalance correction coefficient according to the first envelope information.
  • the signal correction system After obtaining the first envelope information, acquires the amplitude and phase imbalance of the modulated signal, the DC imbalance, and the image signal of the modulated signal and the spatial leakage information of the local oscillator signal, and then the signal correction system
  • the orthogonal imbalance correction coefficient is calculated by using a quadrature imbalance algorithm according to the amplitude and phase imbalance of the modulated signal, the DC imbalance, and the spatial leakage of the image signal of the modulated signal and the local oscillator signal.
  • the signal correction system first performs digital processing on the signal fed back by the first envelope detector tube, adjusts the delay and amplitude of the feedback signal, matches the reference signal, and compares between the feedback signal and the reference signal. The difference is used to solve the orthogonal imbalance correction coefficient.
  • the signal correction system corrects the modulated signal according to the orthogonal imbalance correction coefficient.
  • the signal correction system corrects the modulated signal based on the quadrature imbalance correction coefficient.
  • the signal correction system uses the quadrature imbalance correction coefficient to adjust the amplitude, phase, and DC information of the modulated signal to achieve correction of the modulator and spatial leakage amplitude imbalance.
  • the signal correction system performs dynamic gain compensation on the first modulated signal according to the power amplification result of the first modulated signal to obtain a second modulated signal, so that the power of the second modulated signal conforms to the first envelope detection.
  • the working power of the device ensures that the first envelope detector can continue to operate normally, thereby performing orthogonal imbalance correction on the modulated signal.
  • FIG. 4 another embodiment of the signal correction method in the embodiment of the present application includes:
  • the signal correction system modulates the input signal to obtain a modulated signal.
  • the signal correction system modulates the input signal to obtain a modulated signal.
  • the signal correction system includes a modulator, a first VGA, a PA, a coupler, a second VGA, the first envelope detector, and the second Envelope detection tube;
  • the coupler, the second VGA and the first envelope detector are included in the DPD feedback channel.
  • the signal correction system modulates the input signal by the modulator to generate a modulated signal.
  • the signal correction system performs power amplification on the modulated signal to obtain a first modulated signal.
  • the signal correction system power-amplifies the modulated signal to obtain the first modulated signal.
  • the signal correction system needs to perform power amplification on the modulated signal and then use the output.
  • the signal correction system shown in FIG. 5 can perform power amplification on the modulated signal by the first VGA and the PA to obtain the first modulated signal, wherein the first VGA can be used to determine the modulation.
  • the amplification amplitude of the signal (such as the power amplification range of the modulated signal is 0 dB to 30 dB), and then the PA realizes the final amplification power of the modulated signal and outputs (for example, the maximum power required for output in the system should be 60 dB, Then, when the first VGA reaches a gain of 30 decibels, the PA also needs to amplify the power by 30 decibels to 60 decibels).
  • the functions implemented by the first VGA and the PA in the signal correction system may also be implemented by other devices that can implement variable power adjustment.
  • the first VGA may be composed of a frequency converter and a fixed amplifier, as long as The gain of the modulation signal can be changed, and the specific device is not limited herein.
  • the function of the second VGA can also be implemented by a frequency converter and a fixed amplifier, and the specific device is not limited herein.
  • the signal correction system compensates the first partial modulation signal of the first modulation signal to obtain a second modulation signal, where the power of the second modulation signal satisfies the operating power of the first envelope detector.
  • the signal correction system performs gain compensation on the first partial modulated signal of the first modulated signal to obtain a second modulated signal whose power satisfies the operating power of the first envelope detector.
  • the signal correction system copies the first modulated signal into at least two partial modulated signals, and then selects the first partial modulated signal (ie, one of the at least two partial modulated signals) for signal feedback.
  • the operating power of the first envelope detector is a predetermined power range
  • the power of the second modulated signal is only within the predetermined power range.
  • the envelope detector has a working range of 5 decibels to 10 decibels, that is, the power of the second modulated signal is greater than or equal to 5 decibels and less than or equal to 10 decibels.
  • the coupler performs power allocation on the first modulated signal output by the PA, that is, the signal transmitted to the second VGA through the coupler is already power.
  • the attenuated signal is then compensated by the second VGA to compensate the signal transmitted by the coupler to satisfy the operating power of the first envelope detector to obtain the second modulated signal.
  • the first VGA has a gain range of 20 decibels
  • the power range amplified by the PA is 50 decibels
  • the power range of the signal obtained by the coupler is 5 decibels
  • the operating power of the first envelope detector tube is At 8 decibels
  • the second VGA has a gain range of 3 decibels and is then output.
  • the gain direction of the first VGA and the second VGA is opposite, that is, the gain trend of the first VGA is opposite to the gain trend of the second VGA.
  • the first VGA has a gain range of 0 decibels to 30 decibels
  • the power range amplified by the PA is 30 decibels to 60 decibels
  • the power range of the signal obtained by the coupler is 3 decibels to 6 decibels
  • the The first envelope detector has an operating power of 8 decibels
  • the second VGA has a gain range of 5 decibels to 2 decibels. That is, the gain trend of the first VGA is from small to large, and the gain trend of the second VGA is from large to small.
  • the first envelope detector tube can be connected to the signal correction system in a differential manner as shown in FIG.
  • the first envelope detector tube is also unaffected.
  • the signal correction system collects first envelope information, where the first envelope information is used to indicate an amplitude and phase imbalance of the modulated signal, a DC imbalance, and an image signal of the modulated signal and a spatial leak information of the local oscillator signal.
  • the signal correction system acquires first envelope information of the modulated signal, the first envelope information is used to indicate amplitude and phase imbalance of the modulated signal, DC imbalance, and spatial leakage of the image signal of the modulated signal and the local oscillator signal information.
  • the first envelope detection is located after the second VGA, and the second modulated power output by the first envelope detector at the second VGA is Start working within the preset range (ie, the power is stable).
  • the modulated signal passes through the second modulation obtained by the gain adjustment of the second VGA, since the power of the second modulation satisfies the operating power of the first envelope detector, the first envelope detector can operate normally. Since it is located at the rear stage of the entire modulation link, that is, after the PA, the first envelope detector can collect the amplitude and phase imbalance of the modulated signal number, the DC imbalance, and the image signal and the local oscillator of the modulated signal. Space leak information for the signal.
  • the signal correction system may save the first envelope information or save the positive calculated according to the first envelope information. Transmitting the imbalance correction coefficient, then causing the first envelope detector to temporarily stop working and starting the timer, and then after the timer exceeds the preset period of time, the signal correction system starts the first envelope detector again; The first envelope detector tube again acquires envelope information of the modulated signal.
  • the second envelope detector tube in this embodiment continues to work.
  • the signal correction system acquires second envelope information, where the second envelope information is used to indicate amplitude and phase imbalance and DC imbalance of the modulated signal.
  • the signal correction system acquires second envelope information of the modulated signal, the second envelope information is used to indicate an amplitude and phase imbalance of the modulated signal, and a DC imbalance.
  • the second envelope detector is associated with the modulator and the first VGA, and the second envelope is collected by the second envelope detector.
  • the network information only includes the amplitude and phase imbalance and DC imbalance of the modulated signal.
  • the signal correction system calculates a first correction coefficient of the modulated signal according to the second envelope information.
  • the signal correction system calculates a first correction coefficient of the modulated signal according to the second envelope information by using a quadrature imbalance algorithm.
  • step 403 and step 404 and step 402 there is no sequence between step 403 and step 404 and step 402, that is, the signal correction system collects the first envelope information and collects the second envelope information in no order.
  • the signal correction system calculates a spatial leakage factor according to the first envelope information and the second envelope information.
  • the signal correction system calculates a spatial leakage factor of the image signal of the modulation signal and the local oscillation signal according to the first envelope information and the second envelope information.
  • the signal correction system may calculate a spatial leakage factor of the modulated signal according to a formula, as follows:
  • the distortion model at the first envelope detector is:
  • the distortion model at the second envelope detector (ie, the first correction factor) is:
  • x(k) is the original signal
  • x*(k) represents the amplitude and phase imbalance distortion
  • ⁇ represents the amplitude and phase unbalance distortion coefficient of the modulator
  • c represents the DC imbalance of the modulator
  • ⁇ represents the amplitude of the space leakage.
  • the phase imbalance distortion coefficient, d characterizes the DC imbalance of the space leak
  • G characterizes the gain of the intermediate amplifier.
  • the time when the first envelope detecting tube stops working is used as the starting time, and the signal correcting system starts the timer; then the signal correcting system determines whether the timer duration of the timer has been a preset duration; If the timer duration of the timer exceeds the preset duration, the signal correction system freezes the use of the current link gain and the current quadrature imbalance correction coefficient and activates the first envelope detector; the signal correction system then reads The current envelope information collected by the first envelope detector and the current envelope information collected by the second envelope detector; finally, the signal correction coefficient is based on the current envelope information collected by the first envelope detector and the first The current envelope information collected by the second envelope detector is calculated to obtain the current spatial leakage factor. If the timer duration of the timer does not exceed the preset duration, the signal correction coefficient directly acquires the envelope information collected before the first envelope detector stops working or directly acquires the first envelope detector before stopping the operation. Calculated space leak factor.
  • the signal correction coefficient may use the timer or the timing accumulator, as long as the periodic judgment can be performed, and the specific manner is adopted, and no processing is performed here.
  • the signal correction system compensates the first correction coefficient by using the spatial leakage factor to obtain the orthogonal imbalance correction coefficient.
  • the signal correction system compensates the first correction coefficient by the spatial leakage factor to obtain the orthogonal imbalance correction coefficient.
  • the signal correction coefficient corrects the modulated signal according to the orthogonal imbalance coefficient.
  • the signal correction system corrects the modulated signal based on the quadrature imbalance correction coefficient.
  • the signal correction system uses the quadrature imbalance correction coefficient to adjust the amplitude, phase, and DC information of the modulated signal to achieve correction of the modulator and spatial leakage amplitude imbalance.
  • the signal correction system performs dynamic gain compensation on the first modulated signal according to the power amplification result of the first modulated signal to obtain a second modulated signal, so that the power of the second modulated signal conforms to the first envelope detection.
  • the working power of the tube ensures that the first envelope detector tube can continue to operate normally, thereby performing orthogonal imbalance correction on the modulated signal.
  • the signal correction system collects the second envelope information indicating the amplitude and phase imbalance of the modulated signal and the DC imbalance
  • the second envelope information is integrated with the first envelope information to calculate the orthogonal imbalance correction coefficient. In this calculation, the calculation steps can be saved, thereby improving the correction speed.
  • the signal correction method in the embodiment of the present application has been described above.
  • the signal correction system in the embodiment of the present application will be described below.
  • an embodiment of the signal correction system in the embodiment of the present application includes:
  • a modulation module 601 configured to modulate the input signal to output a modulated signal
  • the power adjustment module 602 is configured to: amplify the power of the modulated signal to obtain a first modulated signal
  • the compensation module 603 is configured to perform power compensation on the first partial modulated signal of the first modulated signal to obtain a second a modulated signal, the power of the second modulated signal satisfies an operating power of the first envelope detector, and the first partial modulated signal is one of at least two partial modulated signals into which the first modulated signal is copied;
  • the acquiring module 604 is configured to acquire the first envelope information, where the first envelope information is used to indicate amplitude and phase imbalance of the modulated signal, and a spatial leakage of the image signal and the local oscillator signal of the modulated signal;
  • the correction module 605 is configured to calculate a quadrature imbalance correction coefficient according to the first envelope information; and correct the modulation signal by using the orthogonal imbalance correction coefficient.
  • the acquiring module 604 is further configured to collect second envelope information, where the second envelope information is used to indicate amplitude and phase imbalance and DC imbalance of the modulated signal;
  • the correction module 605 is further configured to calculate a first correction coefficient of the second envelope detector according to the second envelope information, and calculate a spatial leakage factor according to the first envelope information and the second envelope information; The first correction coefficient is compensated by the spatial leakage factor to obtain the orthogonal imbalance correction coefficient.
  • the signal correction system further includes:
  • a storage module 606, configured to save the space leakage factor
  • the control module 607 is configured to close the first envelope detector and start a timer; if the timer exceeds a preset duration, the first envelope detector is activated.
  • control module 607 is specifically configured to determine whether a power range of the modulation signal of the modulator is within a preset range, and if yes, activate the first envelope detector.
  • the first envelope detector operates in a differential form.
  • the compensation module 603 performs dynamic gain compensation on the first modulated signal according to the power amplification result of the first modulated signal to obtain a second modulated signal, so that the power of the second modulated signal conforms to the first envelope detection.
  • the working power of the device ensures that the first envelope detector can continue to work normally, that is, the first envelope information is acquired, thereby performing orthogonal imbalance correction on the modulated signal.
  • the signal correction system collects the second envelope information indicating the amplitude and phase imbalance of the modulated signal and the DC imbalance
  • the second envelope information is integrated with the first envelope information to calculate the orthogonal imbalance correction coefficient. In this calculation, the calculation steps can be saved, thereby improving the correction speed.
  • FIG. 7 another embodiment of the signal correction system in the embodiment of the present application includes:
  • Modulator 701 first variable gain adjuster 702, digital predistortion correction DPD feedback channel 703 and corrector 704;
  • the DPD feedback channel 703 includes: a first envelope detector 7031, a second variable gain adjuster 7032, and a power splitter 7033;
  • the modulator 701 is configured to modulate the input signal to output a modulated signal
  • the first variable gain adjuster 702 is configured to amplify the power of the modulated signal to obtain a first modulated signal, and output the first modulated signal to the second variable gain adjuster 7032;
  • the power splitter 7033 is configured to copy the first modulated signal into at least two partial modulated signals, and send the first partial modulated signal to the second variable gain adjuster;
  • the second variable gain adjuster 7032 is configured to compensate the power of the first partial modulated signal to obtain a second modulated signal, wherein a power of the second modulated signal satisfies an operating power of the first envelope detector;
  • the first envelope detector 7031 is configured to collect first envelope information, where the first envelope information is used to indicate the modulation signal. Amplitude and phase imbalance of the number and DC imbalance and spatial leakage information of the image signal of the modulated signal and the local oscillator signal;
  • the corrector 704 is configured to calculate a quadrature imbalance correction coefficient according to the amplitude imbalance, the DC imbalance, and the spatial leakage information; and correct the modulation signal of the modulator by using the orthogonal imbalance correction coefficient .
  • the signal correction system further includes:
  • the second envelope detector 705 is connected to the modulator 701, and the second envelope detector is connected to the first variable gain adjuster 702;
  • the second envelope detector 705 is configured to collect second envelope information, where the second envelope information is used to indicate amplitude and phase imbalance and DC imbalance of the modulated signal;
  • the corrector 704 is configured to calculate a first correction coefficient of the second envelope detector according to the second envelope information, and calculate a spatial leakage factor according to the first envelope information and the second envelope information; The first correction coefficient is compensated by the spatial leakage factor to obtain the orthogonal imbalance correction coefficient.
  • the signal correction system further includes a memory 706 and a timer 707;
  • the memory 706 is configured to store the space leakage factor
  • the timer 707 is configured to start timing after the first envelope detector 7031 stops running; when the timer 707 exceeds a preset duration, the first envelope detector 7031 starts to run, the first package
  • the network detector 7031 operates in a differential form.
  • the first variable gain adjuster 702 includes a first VGA 7021 and a PA 7022.
  • the second variable gain adjuster 7032 performs dynamic gain compensation on the first modulated signal according to the power amplification result of the first modulated signal to obtain a second modulated signal, so that the power of the second modulated signal conforms to the
  • the operating power of the first envelope detector 7031 ensures that the first envelope detector 7031 can continue to operate normally, that is, the first envelope information is acquired, thereby performing orthogonal imbalance correction on the modulated signal.
  • the second envelope detector 705 collects second envelope information between the modulator 701 and the first variable gain adjuster, and integrates the second envelope information with the first envelope information to calculate the orthogonality.
  • the correction factor is unbalanced, so that the calculation step can be saved during the calculation process, thereby improving the correction speed.
  • the disclosed system, apparatus, and method may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • there may be another division manner for example, multiple units or components may be combined or Can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or may be each Units exist physically alone, or two or more units can be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • a computer readable storage medium A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present application.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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Abstract

本申请实施例提供了一种信号校正方法以及信号校正系统，用于链路后级的调制信号进行动态增益补偿，使得该调制信号的功率满足该包络检波管的工作功率，从而保证该包络检波管可以持续正常工作，进而实现对该调制信号进行正交不平衡校正。本申请实施例提供的技术方案如下：信号校正系统对将调制信号进行功率放大得到第一调制信号进行补偿得到第二调制信号，第二调制信号的功率满足第一包络检波管的工作功率；信号校正系统采集指示调制信号的幅相不平衡和直流不平衡以及调制信号的镜像信号和本振信号的空间泄露信息的第一包络信息；信号校正系统根据第一包络信息计算得到正交不平衡校正系数；信号校正系统利用正交不平衡校正系数对调制信号进行校正。

Description

一种信号校正方法以及信号校正系统 技术领域
本申请实施例涉及通信领域，尤其涉及一种信号校正方法以及信号校正系统。
背景技术
近年来随着无线通信技术的飞速发展，无线通信系统产品越来越普及，成为当今人类信息社会发展的重要组成部分。射频接收机位于无线通信系统的最前端，其结构和性能直接影响着电子产品世界整个通信系统。优化设计结构和选择合适的制造工艺，以提高系统的性能价格比，是射频工程师追求的方向。由于零(近零)中频系统具有体积小、成本低和易于单片集成的特点，在无线通信领域中受到广泛的关注。但是零(近零)中频系统由体积小和单片集成的特点导致该零(近零)中频系统中的本振泄露和镜像泄露问题一直存在。其中本振信号和镜像信号的泄露会导致本振信号和镜像信号的残留大，进而会恶化本通信单元信号的信噪比或对其他通信单元产生影响。
为了解决这一问题，目前通常采用如图1所示的方法，该链路包括调制器、可变增益放大器(variable gain amplifier，简称：VGA)、功率放大器(power amplifier，简称：PA)以及该PA之后的包络检波管。该调制器用于对输入信号进行调制得到调制信号；该VGA与该PA用于对该调制信号进行功率增益调整然后通过该PA输出；该包络检波管采样该调制器输出后的包络信息，实现校正信息的提取，再通过正交不平衡校正(quadrature modulation compensation，简称：QMC)算法进行校正。
但是这种方法中，该VGA与该PA在对该调制器输出的调制信号进行增益调整是一个动态变化的过程，在调整过程中会出现该PA输出的调制信号的功率超出该包络检波管的工作功率，从而导致该包络检波管无法正常工作。
发明内容
本申请实施例提供了一种信号校正方法以及信号校正系统，用于对链路后级的调制信号进行动态增益补偿，使得该调制信号的功率满足该包络检波器的工作功率，从而保证该包络检波器可以持续正常工作，进而实现对该调制信号进行正交不平衡校正。
第一方面，本申请实施例提供一种信号校正方法，包括：
该信号校正系统将输入的信号进行调制输出调制信号；然后该信号校正系统将该调制信号进行功率放大得到第一调制信号；再然后该信号校正系统对所述第一调制信号的第一部分调制信号进行功率补偿得到第二调制信号，所述第一部分调制信号为所述第一调制信号复制成的至少两部分调制信号中的一份，该第二调制信号的功率满足第一包络检波器的工作功率；再然后，该信号校正系统采集用于指示该调制信号的幅相不平衡和直流不平衡以及该调制信号的镜像信号和本振信号的空间泄露信息的第一包络信息；再然后该信号校正系统根据该第一包络信息计算得到正交不平衡校正系数；最后该信号校正系统根据该正交不平衡校正系数对该调制器的调制信号进行校正。
本申请实施例中，该第一包络检波器可以为包络检波管也可以为频谱仪，只要可以采集包络信息即可，具体方式此处不做限定。
本申请实施例中，该信号校正系统在根据第一包络信息计算得到正交不平衡校正系数并利用该正交不平衡校正系数对该调制信号进行校正的具体过程如下：首先对包络检波器反馈所得的信号进行数字处理，调整反馈信号的延迟和幅度，和参考信号相匹配，再比较反馈信号和参考信号之间的差异，进而求解出正交不平衡校正系数，再利用正交不平衡校正系数对调制信号进行幅度、相位和直流信息进行调整，以此来实现对调制器和空间泄露幅相不平衡的校正。
本申请实施例中，该信号校正系统根据第一调制信号的功率放大结果对该第一调制信号进行动态增益补偿得到第二调制信号，从而使得该第二调制信号的功率符合该第一包络检波器的工作功率，保证该第一包络检波器可以持续正常工作，进而实现对该调制信号进行正交不平衡校正。
可选的，该信号校正系统还可以采用如下方式对该调制信号进行正交不平衡校正，具体方式如下：
该信号校正系统采集用于指示该调制信号的幅相不平衡和直流不平衡第二包络信息；然后该信号校正系统根据该第二包络信息计算得到该第二包络检波器的第一校正系数；该信号校正系统根据该第一包络信息和该第二包络信息计算得到该调制信号镜像信号和本振信号的空间泄露因子；最后该信号校正系统利用该空间泄露因子对该第一校正系数进行补偿得到该正交不平衡校正系数。
可以理解的是，该信号校正系统在仅使用该第一包络信息计算得到该正交不平衡校正系数时的采用的计算方式与该信号校正系统采用该第一包络信息和该第二包络信息计算得到该正交不平衡校正系数时采用的计算方式相同。即该信号校正系统在仅使用该第一包络信息计算得到该正交不平衡校正系数时的计算过程如下：
该信号校正系统先根据该调制信号的幅相不平衡和直流不平衡计算得到一个校正系数；然后该信号校正系统再根据该调制信号的幅相不平衡，直流不平衡和空间泄露信息计算得到空间泄露因子；最后该信号校正系统根据该空间泄露因子对该校正系数进行补偿得到该正交不平衡校正系数。
本申请实施例提供的技术方案中，该信号校正系统采集第二包络信息，并根据该第二包络信息和该第一包络信息计算该正交不平衡校正系数，这样在计算得到正交不平衡校正系数的过程中可以节省计算步骤，从而可以有效的提高校正速度。
可选的，在该信号校正系统中采用了双检波管之后，该信号校正系统还可以采用如下方案对该调制信号进行正交不平衡校正，具体如下：
该信号校正系统在根据该第一包络信息和该第二包络信息计算得到空间泄露因子之后，保存该空间泄露因子，同时该第一包络检波器停止运行并启动计时器；然后在该计时器的计时时长超过预设时长之后，该第一包络检波器开始运行。
本实施例中，在计时器计时的过程中，该信号校正系统实时获取该第二包络检波器采集到的第二包络信息(可以理解的是，该第二包络信息并不是指代固定时刻的包络信息，它用于指代该第二包络检波器获取不同的包络信息)，并根据该第二包络信息计算得到该第一校正系数；然后该信号校正系统根据已保存的空间泄露因子对该第一校正系数进行补偿 得到该正交不平衡校正系数。
本实施例中，该信号校正系统在启动该第一包络检波器的同时，还可以将当前时刻的链路增益和正交不平衡校正系数进行冻结(即当前时刻对调制信号不进行正交不平衡校正)，然后该第一包络检波器采集当前时刻该调制信号的第一包络信息(可以理解的是，该第一包络信息并不是指代固定时刻的包络信息，它用于指代该第一包络检波器获取的不同包络信息)。这时该信号校正系统获取到该第二包络检波器采集当前时刻的调制信号的第二包络信息。然后该信号校正系统根据该当前时刻的第一包络信息与该当前时刻的第二包络信息计算得到当前时刻的空间泄露因子；该信号校正系统根据该当前时刻的第二包络信息计算得到当前时刻的第一校正系数。最后该信号校正系统再利用该当前时刻的空间泄露因子对该当前时刻的第一校正系数进行补偿得到当前时刻的正交不平衡校正系数。
本实施例中，在该信号校正系统启动该第一包络检波器之前，该信号校正系统还可以判断该第一调制信号的功率范围是否在预设范围内，若是，则该第一包络检波器开始运行。
本申请实施例提供的技术方案中，该第一包络检波器进行周期性的工作，可以有效的提高信号校正系统的校正速度。
可选的，该第一包络检波器采用差分形式工作。
本申请实施例中，该第一包络检波器以差分形式连接在该信号校正系统中，可以有效提高DPD反馈通道的该第一包络检波器的抗泄露干扰能力，避免正交不平衡空间泄露因子造成二次污染。
第二方面，本申请实施例提供一种信号校正系统，该信号校正系统具有实现上述方法中信号校正系统的功能。该功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块。
一种可能实现方式中，该信号校正系统包括：
调制模块，用于将输入的信号进行调制输出调制信号；
功率调整模块，用于将该调制信号的功率放大得到第一调制信号；
补偿模块，用于对所述第一调制信号的第一部分调制信号进行功率补偿得到第二调制信号，所述第二调制信号的功率满足第一包络检波器的工作功率，所述第一部分调制信号为所述第一调制信号复制成的至少两部分调制信号中的一份；
采集模块，用于获取采集第一包络信息，该第一包络信息用于指示该调制信号的幅相不平衡和直流不平衡以及该调制信号的镜像信号和本振信号的空间泄露；
校正模块，用于根据该第一包络信息计算得到正交不平衡校正系数；利用该正交不平衡校正系数对该调制信号进行校正。
另一种可能实现方式中，该信号校正系统包括：
调制器、第一可变增益调整器、数字预失真矫正DPD反馈通道和校正器；
该DPD反馈通道包括：第一包络检波器、第二可变增益调整器和功分器；
该调制器，用于将输入的信号进行调制输出调制信号；
该第一可变增益调整器，用于将该调制信号的功率放大得到第一调制信号，并将该第 一调制信号输出至该第二可变增益调整器；
该功分器，用于将该第一调制信号复制成至少两部分调制信号，将第一部分调制信号发给该第二可变增益调整器；
该第二可变增益调整器，用于对该第一部分调制信号的功率进行补偿得到第二调制信号，其中，该第二调制信号的功率满足该第一包络检波器的工作功率；
该第一包络检波器，用于采集第一包络信息，该第一包络信息用于指示该调制信号的幅相不平衡和直流不平衡以及该调制信号的镜像信号和本振信号的空间泄露信息；
该校正器，用于根据该幅相不平衡，该直流不平衡以及该空间泄露信息计算得到正交不平衡校正系数；并利用该正交不平衡校正系数对该调制器的调制信号进行校正。
第三方面，本申请实施例提供一种计算机可读存储介质，包括指令，当该指令在计算机上运行时，该计算机执行上述各项方法。
第四方面，本申请实施例提供一种包含指令的计算机程序产品，当该计算机程序产品在计算机上运行时，该计算机执行上述各项方法。
本申请实施例提供的技术方案中，该信号校正系统根据第一调制信号的功率放大结果对该第一调制信号的部分信号的功率进行动态增益补偿得到第二调制信号，从而使得该第二调制信号的功率符合该第一包络检波器的工作功率，保证该第一包络检波器可以持续正常工作，进而实现对该调制信号进行正交不平衡校正。
附图说明
图1为本申请实施例中现有技术的一个示意图；
图2为本申请实施例中信号校正方法的一个实施例示意图；
图3为本申请实施例中信号校正系统的一个示意图；
图4为本申请实施例中信号校正方法的另一个实施例示意图；
图5为本申请实施例中信号校正系统的一个示意图；
图6为本申请实施例中信号校正系统的一个实施例示意图；
图7为本申请实施例中信号校正系统的另一个实施例示意图。
具体实施方式
本申请实施例提供了一种信号校正方法以及信号校正系统，用于链路后级的调制信号进行动态增益补偿，使得该调制信号的功率满足该包络检波管的工作功率，从而保证该包络检波管可以持续正常工作，进而实现对该调制信号进行正交不平衡校正。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的实施例能够以除了在这里图示或描述的内容以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
近年来随着无线通信技术的飞速发展，无线通信系统产品越来越普及，成为当今人类 信息社会发展的重要组成部分。射频接收机位于无线通信系统的最前端，其结构和性能直接影响着电子产品世界整个通信系统。优化设计结构和选择合适的制造工艺，以提高系统的性能价格比，是射频工程师追求的方向。由于零(近零)中频系统具有体积小、成本低和易于单片集成的特点，在无线通信领域中受到广泛的关注。但是零(近零)中频系统由体积小和单片集成的特点导致该零(近零)中频系统中的本振泄露和镜像泄露问题一直存在。其中本振泄露将会对邻道信号产生干扰。为了解决这一问题，目前通常采用如图1所示的方法，该链路包括调制器、VGA、PA以及该PA之后的包络检波管。该调制器用于对输入信号进行调制得到调制信号；该VGA与该PA用于对该调制信号进行功率增益调整然后通过该PA输出；该包络检波管采样该调制器输出后的包络信息，实现校正信息的提取，再通过正交不平衡校正(quadrature modulation compensation，简称：QMC)算法进行校正。但是这种方法中，该VGA与该PA在对该调制器输出的调制信号进行增益调整是一个动态变化的过程，在调整过程中会出现该PA输出的调制信号的功率超出该包络检波管的工作功率，从而导致该包络检波管无法正常工作。
为了解决这一问题，本申请实施例提供了如下技术方案：该信号校正系统将输入的信号进行调制输出调制信号；然后该信号校正系统将该调制信号进行功率放大得到第一调制信号；再然后该信号校正系统对该第一调制信号的部分信号进行功率补偿得到第二调制信号，该第二调制信号的功率满足第一包络检波器的工作功率；再然后，该信号校正系统采集用于指示该调制信号的幅相不平衡和直流不平衡以及该调制信号的镜像信号和本振信号的空间泄露信息的第一包络信息；再然后该信号校正系统根据该第一包络信息计算得到正交不平衡校正系数；最后该信号校正系统根据该正交不平衡校正系数对该调制器的调制信号进行校正。
下面对本申请实施例中的信号校正方法进行说明，具体请参考图2所示，本申请实施例中信号校正方法的一个实施例包括：
201、信号校正系统对输入信号进行调制得到调制信号。
该信号校正系统对输入的信号进行调制得到调制信号。
本实施例中，以如图3所示的信号校正系统为例，该信号校正系统包括调制器、第一VGA、PA、耦合器、第二VGA以及该第一包络检波管；
其中，该耦合器、该第二VGA与该第一包络检波管包含于DPD反馈通道中。
本实施例中，该信号校正系统通过该调制器对输入信号进行调制生成调制信号。
202、该信号校正系统对该调制信号进行功率放大得到第一调制信号。
该信号校正系统对该调制信号进行功率放大得到该第一调制信号。
在实际应用中，该信号校正系统中需要对该调制信号进行功率放大然后进行输出使用。以图3所示的信号校正系统为例，该信号校正系统可以通过该第一VGA和该PA对该调制信号进行功率放大得到该第一调制信号，其中该第一VGA可以用于确定该调制信号的放大幅度(比如将该调制信号的功率放大范围为0分贝至30分贝)，然后该PA实现该调制信号的最终放大功率并输出(比如该系统中要求输出的最大功率应该是60分贝，则在该第一VGA达到30分贝的增益时，该PA还需要将该30分贝进行功率放大达到60分贝)。
本实施例中，该信号校正系统中的第一VGA与该PA实现的功能也可以由其他可以实现可变功率调整的器件实现，比如该第一VGA可以由一个变频器与固定放大器构成，只要可以实现调制信号的增益可变即可，具体器件此处不做限定。同理，该第二VGA的功能也可以由一个变频器与固定放大器实现，具体器件此处不做限定。
203、该信号校正系统该第一调制信号的第一部分调制信号进行补偿得到第二调制信号，该第二调制信号的功率满足第一包络检波器的工作功率。
该信号校正系统对该第一调制信号的第一部分调制信号进行增益补偿得到功率满足该第一包络检波器的工作功率的第二调制信号。
本实施例中，该信号校正系统对该第一调制信号复制为至少两部分调制信号，然后选择其中的第一部分调制信号(即至少两部分调制信号中的一个)用于信号反馈。
本实施例中，该第一包络检波器的工作功率为预定功率范围，而该第二调制信号的功率只要在该预定功率范围之内即可。比如该包络检波器的工作范围为5分贝至10分贝，即该第二调制信号的功率只要大于或等于5分贝且小于或等于10分贝即可。
本实施例中，该第一包络检波器可以为包络检波管也可以为频谱仪，只要可以采集到包络信息即可，具体此处不做限定。
本实施例中，如图3所示的信号校正系统所示，该耦合器将该PA输出的该第一调制信号进行功率分配，即通过该耦合器传输至该第二VGA的信号已经是功率衰减之后的信号，然后再通过该第二VGA对该耦合器传输的信号以满足该第一包络检波管的工作功率的原则进行补偿得到该第二调制信号。比如，该第一VGA的增益范围20分贝，然后通过PA放大后的功率范围为50分贝，通过该耦合器之后得信号的功率范围为5分贝，而该第一包络检波管的工作功率为8分贝，则该第二VGA的增益范围为3分贝，然后输出。本实施例中，该第一VGA与该第二VGA的增益方向相反，即，该第一VGA的增益趋势与该第二VGA的增益趋势相反。比如即该第一VGA的增益范围为0分贝至30分贝，然后通过PA放大后的功率范围为30分贝至60分贝，通过该耦合器之后得信号的功率范围为3分贝至6分贝，而该第一包络检波管的工作功率为8分贝，则该第二VGA的增益范围为5分贝至2分贝。即该第一VGA的增益趋势为由小至大，而该第二VGA的增益趋势为由大至小。
本实施例中，如图3所示该第一包络检波管可以以差分形式接入该信号校正系统。这样，当共模空间存在泄露时，该第一包络检波管也不会受到影响。
204、该信号校正系统采集第一包络信息，该第一包络信息用于指示该调制信号的幅相不平衡，直流不平衡和该调制信号镜像信号和本振信号的空间泄露信息。
该信号校正系统采集该调制信号的第一包络信息，该第一包络信息用于指示该调制信号的幅相不平衡，直流不平衡以及该调制信号的镜像信号和本振信号的空间泄露信息。
本实施例中，以图3所示的信号校正系统为例，该第一包络检波管位于该第二VGA之后，且该第一包络检波管在该第二VGA输出的第二调制信号的功率在预设范围内(即功率稳定)时开始工作。当调制信号通过该第二VGA的增益调整之后得到第二调制信号时，由于该第二调制信号的功率满足该第一包络检波管的工作功率，即该第一包络检波管可以正常工作。由于其位于整个调制链路的后级，即位于该PA之后，该第一包络检波管可以采集 到该调制信号的幅相不平衡，直流不平衡以及该调制信号的镜像信号和本振信号的空间泄露信息。本实施例中，该第一包络检波管在获取到该第一包络信息之后，该信号校正系统可以保存该第一包络信息或者是保存根据该第一包络信息计算得到的该正交不平衡校正系数，然后使得该第一包络检波管暂时停止工作并启动计时器，然后在该计时器超过预设时间段之后，该信号校正系统再次启动该第一包络检波管；然后该第一包络检波管再次获取调制信号的包络信息。在该计时器计时的过程中，该信号校正系统可以根据已保存的该第一包络信息计算得到该正交不平衡校正系数或者是直接获取已保存的该正交不平衡校正系数。
在实际应用中，当该第一包络检波管进行周期的工作时，该实现的具体流程如下：
本实施例中，以该第一包络检波管停止工作的时刻作为开始时刻，此时该信号校正系统启动计时器；然后该信号校正系统判断该计时器的计时时长是否起过预设时长；若该计时器的计时时长超过该预设时长，则该信号校正系统冻结当前链路增益和当前正交不平衡校正系数的使用并启动该第一包络检波管；然后该信号校正系统读取该第一包络检波管采集的当前包络信息；最后该信号校正系数根据该当前包络信息计算得到当前正交不平衡校正系数。若该计时器的计时时长未超过该预设时长，则该信号校正系数直接获取该第一包络检波管停止工作之前采集的包络信息或者是直接获取该第一包络检波管停止工作之前计算得到的正交不平衡校正系数。
本实施例中，该信号校正系数可以使用该计时器也可以使用定时累计器，只要可以进行周期性判断即可，具体采用何种方式，此处不做处理。
205、该信号校正系统根据该第一包络信息计算得到正交不平衡校正系数。
该信号校正系统在得到该第一包络信息之后，则获取到了该调制信号的幅相不平衡，直流不平衡以及该调制信号的镜像信号和本振信号的空间泄露信息，然后该信号校正系统利用正交不平衡算法根据该调制信号的幅相不平衡，直流不平衡以及该调制信号的镜像信号和本振信号的空间泄露进行计算得到该正交不平衡校正系数。
本实施例中，该信号校正系统首先对该第一包络检波管反馈所得的信号进行数字处理，调整反馈信号的延迟和幅度，和参考信号相匹配，再比较反馈信号和参考信号之间的差异，进而求解出正交不平衡校正系数。
206、该信号校正系统根据该正交不平衡校正系数对该调制信号进行校正。
该信号校正系统根据该正交不平衡校正系数对该调制信号进行校正。
本实施例中，该信号校正系统利用正交不平衡校正系数对调制信号进行幅度、相位和直流信息进行调整，以此来实现对调制器和空间泄露幅相不平衡的校正。
本实施例中，该信号校正系统根据第一调制信号的功率放大结果对该第一调制信号进行动态增益补偿得到第二调制信号，从而使得该第二调制信号的功率符合该第一包络检波器的工作功率，保证该第一包络检波器可以持续正常工作，进而实现对该调制信号进行正交不平衡校正。
具体请参考图4所示，本申请实施例中的信号校正方法的另一个实施例包括：
401、信号校正系统对输入信号进行调制得到调制信号。
该信号校正系统对输入的信号进行调制得到调制信号。
本实施例中，以如图5所示的信号校正系统为例，该信号校正系统包括调制器、第一VGA、PA、耦合器、第二VGA、该第一包络检波管以及该第二包络检波管；
其中，该耦合器、该第二VGA与该第一包络检波管包含于DPD反馈通道中。
本实施例中，该信号校正系统通过该调制器对输入信号进行调制生成调制信号。
402、该信号校正系统对该调制信号进行功率放大得到第一调制信号。
该信号校正系统对该调制信号进行功率放大得到该第一调制信号。
在实际应用中，该信号校正系统中需要对该调制信号进行功率放大然后进行输出使用。以图5所示的信号校正系统为例，该信号校正系统可以通过该第一VGA和该PA对该调制信号进行功率放大得到该第一调制信号，其中该第一VGA可以用于确定该调制信号的放大幅度(比如将该调制信号的功率放大范围为0分贝至30分贝)，然后该PA实现该调制信号的最终放大功率并输出(比如该系统中要求输出的最大功率应该是60分贝，则在该第一VGA达到30分贝的增益时，该PA还需要将该30分贝进行功率放大达到60分贝)。
本实施例中，该信号校正系统中的第一VGA与该PA实现的功能也可以由其他可以实现可变功率调整的器件实现，比如该第一VGA可以由一个变频器与固定放大器构成，只要可以实现调制信号的增益可变即可，具体器件此处不做限定。同理，该第二VGA的功能也可以由一个变频器与固定放大器实现，具体器件此处不做限定。
403、信号校正系统对该第一调制信号的第一部分调制信号进行补偿得到第二调制信号，该第二调制信号的功率满足第一包络检波器的工作功率。
该信号校正系统对该第一调制信号的第一部分调制信号进行增益补偿得到功率满足该第一包络检波器的工作功率的第二调制信号。
本实施例中，该信号校正系统对该第一调制信号复制为至少两部分调制信号，然后选择其中的第一部分调制信号(即至少两部分调制信号中的一个)用于信号反馈。
本实施例中，该第一包络检波器的工作功率为预定功率范围，而该第二调制信号的功率只要在该预定功率范围之内即可。比如该包络检波器的工作范围为5分贝至10分贝，即该第二调制信号的功率只要大于或等于5分贝且小于或等于10分贝即可。
本实施例中，如图5所示的信号校正系统所示，该耦合器将该PA输出的该第一调制信号进行功率分配，即通过该耦合器传输至该第二VGA的信号已经是功率衰减之后的信号，然后再通过该第二VGA对该耦合器传输的信号以满足该第一包络检波管的工作功率的原则进行补偿得到该第二调制信号。比如，该第一VGA的增益范围20分贝，然后通过PA放大后的功率范围为50分贝，通过该耦合器之后得信号的功率范围为5分贝，而该第一包络检波管的工作功率为8分贝，则该第二VGA的增益范围为3分贝，然后输出。本实施例中，该第一VGA与该第二VGA的增益方向相反，即，该第一VGA的增益趋势与该第二VGA的增益趋势相反。比如即该第一VGA的增益范围为0分贝至30分贝，然后通过PA放大后的功率范围为30分贝至60分贝，通过该耦合器之后得信号的功率范围为3分贝至6分贝，而该第一包络检波管的工作功率为8分贝，则该第二VGA的增益范围为5分贝至2分贝。即该第一VGA的增益趋势为由小至大，而该第二VGA的增益趋势为由大至小。
本实施例中，如图5所示该第一包络检波管可以以差分形式接入该信号校正系统。这样，当共模空间存在泄露时，该第一包络检波管也不会受到影响。
404、该信号校正系统采集第一包络信息，该第一包络信息用于指示该调制信号的幅相不平衡，直流不平衡和该调制信号的镜像信号和本振信号的空间泄露信息。
该信号校正系统采集该调制信号的第一包络信息，该第一包络信息用于指示该调制信号的幅相不平衡，直流不平衡以及该调制信号的镜像信号和本振信号的空间泄露信息。
本实施例中，以图5所示的信号校正系统为例，该第一包络检波位于该第二VGA之后，且该第一包络检波管在该第二VGA输出的第二调制的功率在预设范围内(即功率稳定)时开始工作。当调制信号通过该第二VGA的增益调整之后得到的第二调制时，由于该第二调制的功率满足该第一包络检波管的工作功率，即该第一包络检波管可以正常工作。由于其位于整个调制链路的后级，即位于该PA之后，该第一包络检波管可以采集到该调制信号号的幅相不平衡，直流不平衡以及该调制信号的镜像信号和本振信号的空间泄露信息。本实施例中，该第一包络检波管在获取到该第一包络信息之后，该信号校正系统可以保存该第一包络信息或者是保存根据该第一包络信息计算得到的该正交不平衡校正系数，然后使得该第一包络检波管暂时停止工作并启动计时器，然后在该计时器超过预设时间段之后，该信号校正系统再次启动该第一包络检波管；然后该第一包络检波管再次获取调制信号的包络信息。而本实施例中的该第二包络检波管持续性工作。
405、该信号校正系统采集第二包络信息，该第二包络信息用于指示该调制信号的幅相不平衡和直流不平衡。
该信号校正系统采集该调制信号的第二包络信息，该第二包络信息用于指示该调制信号的幅相不平衡，直流不平衡。
本实施例中，以图5所示的信号校正系统为例，该第二包络检波管伴于该调制器与该第一VGA之间，该第二包络检波管采集到的第二包络信息仅包括该调制信号的幅相不平衡和直流不平衡。
406、该信号校正系统根据该第二包络信息计算得到该调制信号的第一校正系数。
该信号校正系统利用正交不平衡算法根据该第二包络信息计算得到该调制信号的第一校正系数。
本实施例中，步骤403和步骤404与步骤402之间并无先后顺序，即该信号校正系统采集第一包络信息以及采集该第二包络信息并无先后顺序。
407、该信号校正系统根据该第一包络信息和该第二包络信息计算得到空间泄露因子。
该信号校正系统根据该第一包络信息和该第二包络信息计算得到该调制信号的镜像信号和本振信号的空间泄露因子。
本实施例中，该信号校正系统可以根据公式计算该调制信号的空间泄露因子，具体如下：
该第一包络检波管处的失真模型为：
y(k)/G＝x(k)+β×x*(k)+c+α×x*(k)/G+d/G；
该第二包络检波管处的失真模型(即该第一校正系数)为：
y(k)'/G＝x(k)+β×x*(k)+c；
两者相减得到空间泄露因子为α×x*(k)/G+d/G；
其中，该x(k)为原始信号，x*(k)表征幅相不平衡失真，β表征调制器的幅相不平衡失真系数，c表征调制器的直流不平衡，α表征空间泄露的幅相不平衡失真系数，d表征空间泄露的直流不平衡，G表征中间放大器的增益。
在实际应用中，当该第一包络检波管进行周期的工作时，该实现的具体流程如下：
本实施例中，以该第一包络检波管停止工作的时刻作为开始时刻，此时该信号校正系统启动计时器；然后该信号校正系统判断该计时器的计时时长是否起过预设时长；若该计时器的计时时长超过该预设时长，则该信号校正系统冻结当前链路增益和当前正交不平衡校正系数的使用并启动该第一包络检波管；然后该信号校正系统读取该第一包络检波管采集的当前包络信息和该第二包络检波管采集的当前包络信息；最后该信号校正系数根据该第一包络检波管采集的当前包络信息和该第二包络检波管采集的当前包络信息计算得到当前空间泄露因子。若该计时器的计时时长未超过该预设时长，则该信号校正系数直接获取该第一包络检波管停止工作之前采集的包络信息或者是直接获取该第一包络检波管停止工作之前计算得到的空间泄露因子。
本实施例中，该信号校正系数可以使用该计时器也可以使用定时累计器，只要可以进行周期性判断即可，具体采用何种方式，此处不做处理。
408、该信号校正系统利用该空间泄露因子对该第一校正系数进行补偿得到该正交不平衡校正系数。
该信号校正系统将该空间泄露因子对该第一校正系数进行补偿得到该正交不平衡校正系数。
409、该信号校正系数根据该正交不平衡系数对该调制信号进行校正。
该信号校正系统根据该正交不平衡校正系数对该调制信号进行校正。
本实施例中，该信号校正系统利用正交不平衡校正系数对调制信号进行幅度、相位和直流信息进行调整，以此来实现对调制器和空间泄露幅相不平衡的校正。本实施例中，该信号校正系统根据第一调制信号的功率放大结果对该第一调制信号进行动态增益补偿得到第二调制信号，从而使得该第二调制信号的功率符合该第一包络检波管的工作功率，保证该第一包络检波管可以持续正常工作，进而实现对该调制信号进行正交不平衡校正。同时该信号校正系统采集指示该调制信号的幅相不平衡与直流不平衡的第二包络信息之后，综合该第二包络信息与该第一包络信息计算该正交不平衡校正系数，这样计算过程中可以节省计算步骤，从而提高校正速度。上面对本申请实施例中的信号校正方法进行了说明，下面对本申请实施例中的信号校正系统进行描述。
具体请参考图6所示，本申请实施例中信号校正系统的一个实施例，包括：
调制模块601，用于将输入的信号进行调制输出调制信号；
功率调整模块602，用于将该调制信号的功率放大得到第一调制信号；
补偿模块603，用于对所述第一调制信号的第一部分调制信号进行功率补偿得到第二 调制信号，所述第二调制信号的功率满足第一包络检波器的工作功率，所述第一部分调制信号为所述第一调制信号复制成的至少两部分调制信号中的一份；
采集模块604，用于获取采集第一包络信息，该第一包络信息用于指示该调制信号的幅相不平衡和直流不平衡以及该调制信号的镜像信号和本振信号的空间泄露；
校正模块605，用于根据该第一包络信息计算得到正交不平衡校正系数；利用该正交不平衡校正系数对该调制信号进行校正。
可选的，该采集模块604，还用于采集第二包络信息，该第二包络信息用于指示该调制信号的幅相不平衡和直流不平衡；
该校正模块605，还用于根据该第二包络信息计算得到该第二包络检波器的第一校正系数；根据该第一包络信息和该第二包络信息计算得到空间泄露因子；利用该空间泄露因子对该第一校正系数进行补偿得到该正交不平衡校正系数。
可选的，该信号校正系统还包括：
存储模块606，用于保存该空间泄露因子；
控制模块607，用于关闭该第一包络检波器并启动计时器；若该计时器超过预设时长，则启动该第一包络检波器。
可选的，该控制模块607，具体用于判断该调制器的调制信号的功率范围是否在预设范围内，若是，则启动该第一包络检波器。
可选的，该第一包络检波器采用差分形式工作。
本实施例中，该补偿模块603根据第一调制信号的功率放大结果对该第一调制信号进行动态增益补偿得到第二调制信号，从而使得该第二调制信号的功率符合该第一包络检波器的工作功率，保证该第一包络检波器可以持续正常工作，即采集第一包络信息，进而实现对该调制信号进行正交不平衡校正。同时该信号校正系统采集指示该调制信号的幅相不平衡与直流不平衡的第二包络信息之后，综合该第二包络信息与该第一包络信息计算该正交不平衡校正系数，这样计算过程中可以节省计算步骤，从而提高校正速度。
具体请参阅图7所示，本申请实施例中信号校正系统的另一个实施例包括：
调制器701、第一可变增益调整器702、数字预失真矫正DPD反馈通道703和校正器704；
该DPD反馈通道703包括：第一包络检波器7031、第二可变增益调整器7032和功分器7033；
该调制器701，用于将输入的信号进行调制输出调制信号；
该第一可变增益调整器702，用于将该调制信号的功率放大得到第一调制信号，并将该第一调制信号输出至该第二可变增益调整器7032；
该功分器7033，用于将该第一调制信号复制成至少两部分调制信号，将第一部分调制信号发给该第二可变增益调整器；
该第二可变增益调整器7032，用于对该第一部分调制信号的功率进行补偿得到第二调制信号，其中，该第二调制信号的功率满足该第一包络检波器的工作功率；
该第一包络检波器7031，用于采集第一包络信息，该第一包络信息用于指示该调制信 号的幅相不平衡和直流不平衡以及该调制信号的镜像信号和本振信号的空间泄露信息；
该校正器704，用于根据该幅相不平衡，该直流不平衡以及该空间泄露信息计算得到正交不平衡校正系数；并利用该正交不平衡校正系数对该调制器的调制信号进行校正。
可选的，该信号校正系统还包括：
第二包络检波器705；
该第二包络检波器705与该调制器701相连，该第二包络检波器与该第一可变增益调整器702相连；
该第二包络检波器705，用于采集第二包络信息，该第二包络信息用于指示该调制信号的幅相不平衡和直流不平衡；
该校正器704，具体用于根据该第二包络信息计算得到该第二包络检波器的第一校正系数；根据该第一包络信息和该第二包络信息计算得到空间泄露因子；利用该空间泄露因子对该第一校正系数进行补偿得到该正交不平衡校正系数。可选的，该信号校正系统还包括存储器706以及计时器707；
该存储器706，用于存储该空间泄露因子；
该计时器707，用于在该第一包络检波器7031停止运行后启动计时；当该计时器707超过预设时长，该第一包络检波器7031开始运行可选的，该第一包络检波器7031采用差分形式工作。
可选的，该第一可变增益调整器702包括第一VGA7021和PA7022。
本实施例中，该第二可变增益调整器7032根据第一调制信号的功率放大结果对该第一调制信号进行动态增益补偿得到第二调制信号，从而使得该第二调制信号的功率符合该第一包络检波器7031的工作功率，保证该第一包络检波器7031可以持续正常工作，即采集第一包络信息，进而实现对该调制信号进行正交不平衡校正。同时在该第二包络检波器705在调制器701与该第一可变增益调整器之间采集第二包络信息，综合该第二包络信息与该第一包络信息计算该正交不平衡校正系数，这样计算过程中可以节省计算步骤，从而提高校正速度。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统，装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各 个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (15)

  1. 一种信号校正系统，其特征在于，包括：
    调制器、第一可变增益调整器、数字预失真矫正DPD反馈通道和校正器；
    所述DPD反馈通道包括：第一包络检波器、第二可变增益调整器和功分器；
    所述调制器，用于将输入的信号进行调制输出调制信号；
    所述第一可变增益调整器，用于将所述调制信号的功率放大得到第一调制信号，并将所述第一调制信号输出至所述第二可变增益调整器；
    所述功分器，用于将所述第一调制信号复制成至少两部分调制信号，将第一部分调制信号发给所述第二可变增益调整器；
    所述第二可变增益调整器，用于对所述第一部分调制信号的功率进行补偿得到第二调制信号，其中，所述第二调制信号的功率满足所述第一包络检波器的工作功率；
    所述第一包络检波器，用于采集第一包络信息，所述第一包络信息用于指示所述调制信号的幅相不平衡和直流不平衡以及所述调制信号的镜像信号和本振信号的空间泄露信息；
    所述校正器，用于根据所述第一包络信息计算得到正交不平衡校正系数；并利用所述正交不平衡校正系数对所述调制器的调制信号进行校正。
  2. 根据权利要求1所述的信号校正系统，其特征在于，所述信号校正系统还包括：
    第二包络检波器；
    所述第二包络检波器与所述调制器相连，所述第二包络检波器与所述第一可变增益调整器相连；
    所述第二包络检波器，用于采集第二包络信息，所述第二包络信息用于指示所述调制信号的幅相不平衡和直流不平衡；
    所述校正器，具体用于根据所述第二包络信息计算得到所述第二包络检波器的第一校正系数；根据所述第一包络信息和所述第二包络信息计算得到空间泄露因子；利用所述空间泄露因子对所述第一校正系数进行补偿得到所述正交不平衡校正系数。
  3. 根据权利要求2所述的信号校正系统，其特征在于，所述信号校正系统还包括存储器以及计时器；
    所述存储器与所述校正器相连，所述计时器与所述第一包络检波器相连；
    所述存储器，用于存储所述空间泄露因子；
    所述计时器，用于在所述第一包络检波器停止运行后启动计时；当所述计时器超过预设时长，所述第一包络检波器开始运行。
  4. 根据权利要求1至3中任一项所述的信号校正系统，其特征在于，所述第一包络检波器采用差分形式工作。
  5. 根据权利要求1至3中任一项所述的信号校正系统，其特征在于，所述第一可变增益调整器包括：第一可变增益放大器VGA和功率放大器PA。
  6. 一种信号校正方法，其特征在于，包括：
    信号校正系统将输入的信号进行调制输出调制信号；
    所述信号校正系统对所述调制信号进行功率放大得到第一调制信号；所述信号校正系统对所述第一调制信号的第一部分调制信号进行功率补偿得到第二调制信号，所述第二调制信号的功率满足第一包络检波器的工作功率，所述第一部分调制信号为所述第一调制信号复制成的至少两部分调制信号中的一份；
    所述信号校正系统采集第一包络信息，所述第一包络信息用于指示所述调制信号的幅相不平衡和直流不平衡以及所述调制信号的镜像信号和本振信号的空间泄露信息；
    所述信号校正系统根据第一包络信息计算得到正交不平衡校正系数；
    所述信号校正系统利用所述正交不平衡校正系数对所述调制信号进行校正。
  7. 根据权利要求6所述的方法，其特征在于，所述信号校正系统利用所述正交不平衡校正系数对所述调制信号进行校正之前，所述方法还包括：
    所述信号校正系统采集第二包络信息，所述第二包络信息用于指示所述调制信号的幅相不平衡和直流不平衡；
    所述信号校正系统根据所述第二包络信息计算得到第一校正系数；
    所述信号校正系统根据所述第一包络信息和所述第二包络信息计算得到空间泄露因子；
    所述信号校正系统利用所述空间泄露因子对所述第一校正系数进行补偿得到所述正交不平衡校正系数。
  8. 根据权利要求7所述的方法，其特征在于，所述信号校正系统根据所述第一包络信息和所述第二包络信息计算得到空间泄露因子之后，所述方法还包括：
    所述信号校正系统保存所述空间泄露因子，同时关闭所述第一包络检波器并启动计时器；
    若所述计时器超过预设时长，则所述信号校正系统启动所述第一包络检波器。
  9. 根据权利要求8所述的方法，其特征在于，所述第一包络检波器开始运行之前，所述方法还包括：
    若所述第一调制信号的功率范围是否符合预设范围，则所述信号校正系统启动所述第一包络检波器。
  10. 根据权利要求6至9中任一项所述的方法，其特征在于，所述第一包络检波器采用差分形式工作。
  11. 一种信号校正系统，其特征在于，包括：
    调制模块，用于将输入的信号进行调制输出调制信号；
    功率调整模块，用于将所述调制信号的功率放大得到第一调制信号；
    补偿模块，用于对所述第一调制信号的第一部分调制信号进行功率补偿得到第二调制信号，所述第二调制信号的功率满足第一包络检波器的工作功率，所述第一部分调制信号为所述第一调制信号复制成的至少两部分调制信号中的一份；
    采集模块，用于获取采集第一包络信息，所述第一包络信息用于指示所述调制信号的幅相不平衡和直流不平衡以及所述调制信号的镜像信号和本振信号的空间泄露信息；
    校正模块，用于根据所述第一包络信息计算得到正交不平衡校正系数；利用所述正交 不平衡校正系数对所述调制信号进行校正。
  12. 根据权利要求11所述的信号校正系统，其特征在于，所述采集模块，还用于采集第二包络信息，所述第二包络信息用于指示所述调制信号的幅相不平衡和直流不平衡；
    所述校正模块，还用于根据所述第二包络信息计算得到所述第二包络检波器处的第一校正系数；根据所述第一包络信息和所述第二包络信息计算得到空间泄露因子；利用所述空间泄露因子对所述第一校正系数进行补偿得到所述正交不平衡校正系数。
  13. 根据权利要求12所述的信号校正系统，其特征在于，所述信号校正系统还包括：
    存储模块，用于保存所述空间泄露因子；
    控制模块，用于关闭所述第一包络检波器并启动计时器；若所述计时器超过预设时长，则启动所述第一包络检波器。
  14. 根据权利要求13所述的信号校正系统，其特征在于，所述控制模块，还用于判断所述调制器的调制信号的功率范围是否在预设范围内，若是，则启动所述第一包络检波器。
  15. 根据权利要求11至14中任一项所述的信号校正系统，其特征在于，所述第一包络检波器采用差分形式工作。
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