WO2019129013A1 - Dispositif et procédé de correction - Google Patents

Dispositif et procédé de correction Download PDF

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Publication number
WO2019129013A1
WO2019129013A1 PCT/CN2018/123636 CN2018123636W WO2019129013A1 WO 2019129013 A1 WO2019129013 A1 WO 2019129013A1 CN 2018123636 W CN2018123636 W CN 2018123636W WO 2019129013 A1 WO2019129013 A1 WO 2019129013A1
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Prior art keywords
channel
level digital
digital signal
conversion circuit
correction
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PCT/CN2018/123636
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English (en)
Chinese (zh)
Inventor
洪艺伟
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华为技术有限公司
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Publication of WO2019129013A1 publication Critical patent/WO2019129013A1/fr

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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
    • H04B1/38—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems

Definitions

  • the present application relates to the field of communications technologies, and in particular, to a calibration apparatus and method.
  • MIMO multiple-input multiple-output
  • Massive MIMO massive multiple access multiple-output
  • PA Power Amplifier
  • the traditional method of improving the efficiency of MIMO/Massive MIMO transceiver power amplifier adopts the correction method to improve the efficiency of the power amplifier.
  • a digital pre-distortion (DPD) module is set in each RF channel, and the power of the power amplifier is corrected by the DPD module.
  • DPD digital pre-distortion
  • each radio channel introduces a DPD module, which will bring severe challenges to the bandwidth and cost of the transceiver.
  • the present application provides a calibration apparatus and method for improving the efficiency of a PA while reducing the complexity and cost of the PA correction, thereby greatly reducing the complexity of the transceiver and the hardware cost.
  • the present application provides a calibration apparatus including: a first conversion circuit, a second conversion circuit, a third conversion circuit, a fourth conversion circuit, a modeling circuit, and a correction circuit.
  • a first conversion circuit configured to perform a first conversion process on each of the N-way pre-transmitted beam stream-level digital signals, to obtain an M-channel pre-transmitted antenna stream-level digital signal, where both M and N are integers greater than 1, and M is greater than N.
  • the second conversion circuit is configured to perform a second conversion process on the M-channel pre-transmitted antenna stream level digital signal to obtain an actual channel-level analog signal of the M-channel.
  • the third conversion circuit is configured to perform a third conversion process on each channel of the actual channel-level analog signal of the M-channel to obtain an actual antenna-level digital signal of the M-channel.
  • the fourth conversion circuit is configured to perform fourth conversion processing on the actual antenna stream level digital signal of the M path to obtain N actual beam current level digital signals.
  • the modeling circuit is configured to model the N-channel pre-transmitted beam stream level digital signal and the N-channel actual beam-level digital signal to obtain a pre-distortion coefficient corresponding to each of the N-way pre-transmitted beam stream level digital signals.
  • the first conversion circuit or the fourth conversion circuit can utilize the matrix conversion circuit to implement its corresponding function. That is, the first conversion circuit or the fourth conversion circuit may be a matrix conversion circuit, or the first conversion circuit or the fourth conversion circuit may include a matrix conversion circuit.
  • each pre-distortion coefficient is obtained according to N pre-transmitted beam current level digital signals and N actual beam current level digital signals.
  • a correction circuit for correcting each of the N pre-transmitted beam-level digital signals by using a corresponding pre-distortion coefficient of each of the N-way pre-transmitted beam-level digital signals to obtain N-corrected beam-level digital signals .
  • the first conversion circuit and the fourth conversion circuit conversion between the M channel level signal and the N channel beam level signal (N is less than M) can be realized, and then through a modeling module and a correction module pair.
  • the beam current level signal modeling and correction of the beam current level not only greatly improves the correction accuracy, but also greatly simplifies the complexity of the calibration device, and is easier to implement, thereby further reducing the correction cost and thereby reducing the complexity of the transceiver. Degree and cost.
  • the modeling process of the modeling circuit is a nonlinear modeling process for the time domain and the spatial domain.
  • the second conversion circuit includes an up conversion circuit, a digital to analog conversion circuit, and a power amplification circuit.
  • the second conversion circuit may further include a modulation circuit or the like after the digital to analog conversion circuit and before the power amplification circuit.
  • the second conversion circuit can be designed according to the actual design requirements of the transceiver, and one or more circuits are added or removed. This application does not limit this. It can be seen that the second conversion circuit can be flexibly designed according to requirements.
  • the third conversion circuit includes an analog to digital conversion circuit and a down conversion circuit.
  • an attenuation circuit may be included between the analog to digital conversion circuit and the down conversion circuit to protect each circuit on the feedback link.
  • the third conversion circuit is consistent with the description of the second conversion circuit above, and the circuit specifically included in the third conversion circuit may be increased or decreased according to actual needs, which is not limited in this application. Similarly, the third conversion circuit can be flexibly designed according to requirements.
  • the third conversion circuit belongs to the uplink.
  • the third conversion circuit further includes a selection circuit for acquiring an actual channel level analog signal of a portion of the energy.
  • a selection circuit for acquiring an actual channel level analog signal of a portion of the energy.
  • An exemplary such selection circuit can be a circulator or a single pole double throw switch or the like.
  • the signal leaked to the feedback link in the downlink time slot by the selection circuit is used as the feedback signal, so that the actual channel-level analog signal can be obtained without using an additional coupling circuit, so that the modeling circuit and the correction circuit can be further fed back.
  • the feedback link is an uplink
  • the signal leaked to the uplink in the downlink time slot is used as a feedback signal by the selection circuit, and at the same time, the uplink is used as the feedback link, and the feedback chain does not need to be specifically set.
  • the road directly utilizes the feature of uplink idleness in the downlink time slot, thereby greatly simplifying the complexity and cost of the correction device.
  • the present application provides a calibration method, which specifically includes the following method steps:
  • the second conversion process is performed on the M-channel pre-transmitted antenna stream level digital signal to obtain the actual channel-level analog signal of the M-channel.
  • Each of the N pre-transmitted beam-level digital signals is corrected using a pre-distortion coefficient corresponding to each of the N-way pre-transmitted beam-level digital signals to obtain N-corrected beam-level digital signals.
  • the calibration apparatus provided by the above first aspect and the correction method provided by the second aspect are applicable to a time division duplex communication system, and the working bandwidth can be realized by using the downlink as a feedback link.
  • In-range correction also known as in-band correction, is a significant savings in bandwidth compared to traditional third-order (bandwidth) correction.
  • the present application provides a radio frequency system comprising the above first aspect and the correction device of any of the possible embodiments of the first aspect.
  • the present application provides a baseband system comprising the above first aspect and the correction apparatus of any of the possible aspects of the first aspect.
  • the application provides an access network device, comprising the above first aspect and the correction device of any of the possible aspects of the first aspect, and/or the third aspect and the third aspect radio frequency system, and/or The above fourth aspect and the fourth aspect baseband system.
  • the correction device provided by the present application may be a radio frequency system.
  • it may be a radio remote unit.
  • the correction device provided by the present application can be a baseband system.
  • it may be a baseband unit.
  • the correction device provided by the present application may be an access network device.
  • it can be a base station.
  • the present application provides a computer storage medium for storing a program, when the program is called by a processor, for performing the second aspect and the correction method of any of the possible embodiments of the second aspect.
  • FIG. 1 is a basic schematic diagram of a transceiver calibration provided by the present application.
  • FIG. 2 is a schematic diagram of a principle of a calibration apparatus 200 according to the present application.
  • FIG. 3 is a schematic diagram of the principle of a calibration apparatus 300 provided by the present application.
  • FIG. 4 is a schematic diagram of an application of a calibration apparatus 400 provided by the present application.
  • FIG. 5 is a flow chart of a calibration method provided by the present application.
  • plural means two or more, and other quantifiers are similar thereto.
  • "and/or” describing the association relationship of the associated objects, indicating that there may be three relationships, for example, A and/or B, which may indicate that there are three cases where A exists separately, A and B exist at the same time, and B exists separately.
  • the character "/" generally indicates that the contextual object is an "or" relationship.
  • the access network device may be a base station (BS) or a base transceiver station (BTS), and is a device deployed in the radio access network to provide a wireless communication function for the terminal device.
  • BS base station
  • BTS base transceiver station
  • the names of devices with base station functions may be different, for example, in an LTE network, called an evolved NodeB (eNB or eNodeB), in the third generation.
  • eNB evolved NodeB
  • eNodeB evolved NodeB
  • a communication (3G) network it is called a Node B, or it is applied to a fifth-generation communication system or the like.
  • access network devices For convenience of description, in the present application, the above-mentioned devices having the functions of the base station are collectively referred to as access network devices.
  • FIG. 1 is a schematic diagram of the correction of the transceiver system.
  • the digital signal to be transmitted shown in the figure is divided into two paths, one enters the DPD module, and one enters the adaptive mode.
  • the DPD module performs digital predistortion processing on the digital signal to be transmitted according to the predistortion coefficient provided by the adaptor.
  • the predistortion process refers to a process opposite to the downlink nonlinear characteristic including the PA.
  • the DPD module pre-distorts the digital signal to be transmitted and outputs a pre-distorted digital signal; a digital-to-analog converter (DAC) converts the pre-distorted digital signal into a low-frequency or intermediate-frequency analog signal, and then upconverts The low frequency or intermediate frequency analog signal is converted into a radio frequency signal, and the radio frequency signal is amplified by the PA.
  • DAC digital-to-analog converter
  • the PA output signal is divided into two paths, most of which reach the antenna and are transmitted by the antenna to the wireless space; a small part of the signal is sent to the feedback channel through the coupler, and the signal is down-converted in the feedback channel and then sent to the analog-to-digital converter ( ADC, analog-to-digital converter), the ADC converts the signal into a digital signal, that is, feeds back the digital signal, and then sends it to the adaptor; the adaptor calculates the pre-distortion coefficient according to the digital signal to be transmitted and the feedback digital signal, and the calculation will be performed.
  • the pre-distortion coefficient is passed to the DPD module.
  • the DPD module performs pre-distortion processing on the subsequently input digital signal to be transmitted according to the pre-distortion coefficient from the adaptor, and can be cycled.
  • Figure 1 only illustrates one downlink and one feedback link.
  • each downlink needs to be separately set up with a DPD module, and each downlink needs to set a corresponding feedback link.
  • the corrected system becomes more and more complex, and the cost increases exponentially with the increase of the downlink.
  • the embodiment of the present application provides a calibration apparatus, which can reduce the cost of the transceiver, and can also improve the working efficiency of the transceiver, especially the efficiency of the power amplifier.
  • the main idea provided by the present application is: in a communication system including N downlinks, by setting a beam correction circuit, a first conversion circuit, a fourth conversion circuit, and a modeling circuit between the downlink and the feedback link, To achieve digital predistortion correction of the beam current level signal.
  • the first conversion circuit is configured to perform a first conversion process on each of the N pre-transmitted beam stream level signals to obtain an M-channel pre-transmitted antenna stream level signal.
  • the fourth conversion circuit is configured to perform fourth conversion processing on the actual antenna stream level signal of the M channel output by the PA to obtain an actual beam current level signal of the N channel.
  • the modeling circuit is configured to perform modeling processing on the N pre-transmitted beam stream level signal and the N-way actual beam stream level signal to obtain pre-distortion corresponding to each of the N-way pre-transmitted beam stream level signals coefficient. Wherein each of the pre-distortion coefficients is obtained according to the N-way pre-transmitted beam current level digital signal and the N-way actual beam current level digital signal.
  • a correction circuit for correcting each of the N pre-transmitted beam stream level signals by using a corresponding pre-distortion coefficient of each of the N pre-transmitted beam stream level signals to obtain N-corrected beam current level numbers signal.
  • the corrected beam current level digital signal in the present application may also be referred to as a (corrected) pre-distortion beam current level digital signal.
  • the first conversion circuit or the fourth conversion circuit can utilize the matrix conversion circuit to implement its corresponding function. That is, the first conversion circuit or the fourth conversion circuit may be a matrix conversion circuit, or the first conversion circuit or the fourth conversion circuit may include a matrix conversion circuit.
  • the first conversion circuit and the fourth conversion circuit conversion between the channel level signal and the signal of a small number of beam current levels can be realized, and then the beam current level is passed through a modeling module and a correction module.
  • the signal is subjected to modeling correction of the beam current level, which not only greatly improves the calibration accuracy, but also greatly simplifies the complexity of the calibration device and is easier to implement, thereby further reducing the correction cost.
  • the feedback link described above may use the uplink as a feedback link, so that no special feedback link is set for each downlink, thereby further reducing the complexity and cost of the calibration apparatus.
  • FIG. 2 is a schematic diagram showing the principle of the calibration apparatus 200.
  • the calibration apparatus includes: a first conversion circuit 10, a second conversion circuit 20, a third conversion circuit 30, a fourth conversion circuit 40, and a modeling circuit 50. And a correction circuit 60.
  • the downlink includes, in order, a first conversion circuit 10, a second conversion circuit 20, and a correction circuit 60.
  • the feedback link includes a third conversion circuit 30 and a fourth conversion circuit 40 in sequence.
  • the modeling circuit 50 is disposed between the downlink and the feedback link.
  • the first conversion circuit 10 is configured to perform a first conversion process on each of the N pre-transmitted beam stream level digital signals to obtain an M-channel pre-transmitted antenna stream level digital signal.
  • M and N are both integers greater than 1, and M is greater than or equal to N.
  • the second conversion circuit 20 is configured to perform a second conversion process on the M-channel pre-transmitted antenna stream level digital signal to obtain an actual channel-level analog signal of the M-channel.
  • the third conversion circuit 30 is configured to perform a third conversion process on each channel of the actual channel-level analog signal of the M-channel to obtain an actual antenna-level digital signal of the M-channel.
  • the fourth conversion circuit 40 is configured to perform a fourth conversion process on the actual antenna stream level digital signal of the M channel to obtain N actual beam current level digital signals.
  • the modeling circuit 50 is configured to model N-way pre-transmitted beam current-level digital signals and N-way actual beam-level digital signals, and obtain corresponding pre-distortion coefficients of each of the N pre-transmitted beam-level digital signals. . Wherein, modeling each of the pre-distortion coefficients is obtained according to the N-way pre-transmitted beam current level digital signal and the N-way actual beam current level digital signal.
  • the modeling circuit 50 can perform modeling processing according to the following formula:
  • i denotes the beam stream number of each carrier
  • j denotes the carrier number
  • k is a modeling parameter preset according to the PA performance
  • preset ki ⁇ [-3,3],kj ⁇ [-3,3] Err sifj represents the nonlinear error corresponding to the pre-transmitted beam current level digital signal of the i-th beam stream of the j-th path carrier
  • S i f j is the actual beam-level digital signal of the i-th beam stream of the j-th carrier, Obtained S i f j and S i+ki f j+kj
  • the predistortion coefficients ( ⁇ ki, kj , ⁇ ki, kj , ⁇ ki, kj ) corresponding to each pre-transmitted beam current level digital signal can be extracted, and then The modeling circuit 50
  • the pre-distortion coefficient corresponding to each of the pre-transmitted beam-level digital signals is associated with all the N-way pre-transmitted beam-level digital signals and all the N-way actual beam-level digital signals.
  • the exemplary modeling can nonlinearly model each beam current level signal from the time domain and the spatial domain, thereby improving the correction accuracy of the calibration device.
  • the correction circuit 60 is configured to correct each path of the N pre-transmitted beam current level digital signals by using a corresponding pre-distortion coefficient of each of the N pre-transmitted beam current-level digital signals to obtain N-corrected beam current level numbers. signal.
  • the first conversion circuit 10 and the fourth conversion module 40 can convert between the N-channel beam stream level signal and the M-channel antenna stream level signal.
  • the number N of the beam stream level is smaller than the antenna stream.
  • the number of channels of the level signal M for example, in many MIMO scenarios, the N size is much smaller than M. Therefore, by correcting the beam current level signal, the number of correction circuits is greatly reduced, and the complexity and cost of the correction are reduced.
  • each pre-distortion coefficient is associated with all pre-transmitted beam current level digital signals and all actual beam current level digital signals, by adding each The error correlation between the path beam level signals improves the correction accuracy of each channel signal.
  • the second conversion circuit 20 includes a power amplification circuit.
  • FIG. 3 is a schematic diagram of a calibration apparatus 300 according to an embodiment of the present application.
  • the second conversion circuit 20 may further include an analog to digital conversion circuit and/or an up conversion circuit (not shown).
  • the second conversion circuit 20 may further include a modulation circuit or the like after the digital to analog conversion circuit and before the power amplification circuit.
  • the second conversion circuit 20 can be designed according to the actual design requirements of the transceiver, and one or more circuits are added or removed. This application does not limit this.
  • the calibration device shown in FIG. 3 is applied to a Time-Division Duplexing (TDD) communication system.
  • the third conversion circuit 30 shown in FIG. 3 includes a selection circuit 310, optionally including an analog to digital conversion circuit 320, and/or a down conversion circuit 330.
  • the third conversion circuit 30 is identical to the second conversion circuit 20, and the circuit specifically included in the third conversion circuit 30 can be increased or decreased according to actual needs, which is not limited in this application.
  • the uplink can be selected as the feedback link for the correction device.
  • the selection circuit may be a circulator.
  • the circulator may be used to leak the signal to the uplink in the downlink time slot as a feedback signal, and at the same time.
  • the uplink as a feedback link
  • the downlink as a feedback link, and since the TDD uplink and downlink operating bands are the same, intra-bandwidth correction of the operating band can be achieved, compared with the conventional third-order (bandwidth) correction scheme, this application
  • the correction scheme of the calibration device provided by the embodiment is simple and easy, and the bandwidth is greatly saved.
  • FIG. 4 is a schematic diagram of the application of the calibration device 400 provided by the present application.
  • the communication system shown in Fig. 4 is a communication system of N-channel carriers, and there is only one beam-level signal on each carrier. Therefore, N-carriers have a total of N pre-transmitted beam-level digital signals, that is, Figure 4 is for the N-way.
  • An indication of the correction of the pre-transmitted beam current level digital signal Referring to the correction processing of the first pre-emission beam stream level digital signal shown in FIG.
  • the first path pre-transmission beam stream level digital signal is multiplied by the pre-distortion coefficient by the first path correction circuit 60 to obtain the corrected The pre-distorted beam current level digital signal, thereby further transmitting the corrected pre-distortion beam current level digital signal to the PA in the downlink, thereby realizing the correction of the PA and improving the working efficiency of the PA, thereby Improve the efficiency of the transceiver.
  • the working mechanism of the calibration apparatus 400 is specifically: the first conversion circuit 10 of the first way converts the first pre-transmitted beam current level digital signal into the M-channel antenna stream level digital signal; the M-channel antenna flow level Each channel of the digital signal is mapped to the M channel by the up-conversion conversion process to obtain the M-channel channel-level digital RF signal, wherein the first channel antenna-level digital signal up-converted by each beam-level signal is converted.
  • the first channel-level digital RF signal is converted into the first channel-level analog RF signal through the first-channel DAC; the first channel-level analog RF signal is amplified by the PA to obtain the actual channel-level analog RF signal of the first channel;
  • the actual channel-level analog RF signal passes through the circulator 310, and most of the actual channel-level analog RF signals are transmitted through the first antenna, and a small portion of the actual channel-level analog shot
  • the frequency signal will leak to the ADC of the first uplink, thereby obtaining the actual channel-level digital RF signal of the first channel; the actual channel-level digital RF signal of the first channel is down-converted and mapped to each beam respectively.
  • the first channel antenna level signal of the flow level thereby obtaining signals of each of the first antenna stream stages corresponding to the N digital signals to be transmitted, and the signal is the actual antenna stream level digital signal of the M path
  • the actual M-channel digital signal corresponding to the M-channel corresponding to the first-stage pre-transmitted beam current-level digital signal is processed by the fourth conversion module 40 of the first path, and converted into the actual first-order beam-level digital signal of the first path;
  • the module module 50 compares and models the first pre-transmitted beam current level digital signal and the first actual beam current level digital signal, and calculates a nonlinear error of the digital signal of the beam current level, and so on.
  • the nonlinear error of the beam current digital signal of the 2nd, 3rd, and Nth roads is the same as the nonlinear error of the beam current digital signal of the 1st channel; further, the modeling module 50 pairs all N Road beam flow
  • the nonlinear error corresponding to the digital signal is modeled, that is, the nonlinear error corresponding to all N-channel beam-level digital signals is used as a parameter to model and calculate the pre-distortion coefficient of each channel, that is, the pre-distortion coefficient of each channel.
  • the nonlinearity error is associated with all N channels; the modeling module 50 outputs the predistortion coefficients of each channel to the correction module 60 of the corresponding path, such as outputting the first path predistortion coefficient to the correction module 60 of the first path.
  • the first pre-distortion beam current level digital signal can be obtained, thereby realizing the first pre-transmitted beam current level. Correction of digital signals.
  • the pre-transmitted beam current level digital signals of other paths can be corrected as well, and will not be described here. Thereby beam current level correction for all beam current level digital signals of the system of Figure 4 is achieved.
  • the M downlink downlink PAs can be nonlinearly corrected by one modeling module 50 and N correction circuits 60. Since N is smaller than M, the correction cost is greatly saved.
  • only one modeling module 50 is needed to correct all N-channel beam-level digital signals by using the beam-level modeling device provided by the present application, that is, the pre-distortion coefficients of each channel are all
  • the nonlinear error quantities of the N-channel beam-level signals are correlated, so that all the beam-level signals are uniformly modeled, so that all beam-level signals can be uniformly corrected, and all beam-level signals of all carriers can be used.
  • Modeling realizes the modeling of time domain and airspace integration. It adopts two dimensions of unified correction to improve the correction accuracy, and further simplifies the complexity and implementation cost of the calibration, which simplifies the complexity of the transceiver and Achieve costs.
  • the circulator 320 in the above embodiment may be a single-pole double-throw switch, wherein one output of the single-pole double-throw switch may be connected to the antenna through a filter, and the other output is connected to the uplink.
  • the single-pole double-throw switch turns on the downlink, a small part of the signal leaks to the uplink, so that the uplink can be used as the feedback link, which also saves the complexity of the calibration device and saves cost.
  • each carrier transmits a single stream beam stream level signal.
  • each carrier can also transmit a multi-stream beam stream level signal. This scenario only increases the number of paths of the beam stream level signal that need to be corrected.
  • the specific correction principle is the same as that in the above embodiment, and details are not described herein again.
  • the present application does not limit the number of streams and the number of carriers of the beam stream level signal transmitted by each carrier.
  • the correction device provided by the present application effectively reduces the cost of calibration and the complexity of the calibration device, thereby further reducing the cost and complexity of the transceiver.
  • the embodiment of the present application provides a calibration system, including the calibration apparatus provided by any of the above embodiments.
  • the embodiment of the present application provides a radio frequency system, including the calibration apparatus provided by any of the above embodiments, and/or the correction system provided by the embodiment.
  • the embodiment of the present application provides a baseband system, including the calibration apparatus provided by any of the above embodiments, and/or the correction system provided by the embodiment.
  • the embodiment of the present application provides an access network device, including the calibration apparatus provided by any of the foregoing embodiments, and/or the calibration system provided by the embodiment, and/or the radio frequency system provided by the embodiment.
  • the calibration device provided by the embodiment of the present application may be a radio frequency system.
  • it may be a radio remote unit.
  • the correction device provided by the embodiment of the present application may be a baseband system, and may be a baseband unit.
  • the correcting device provided by the embodiment of the present application may be an access network device.
  • it may be a base station.
  • FIG. 5 is a flowchart of a calibration method provided by the present application. The method includes:
  • S510 Perform a first conversion process on each of the N-channel pre-transmitted beam stream-level digital signals to obtain an M-channel pre-transmitted antenna stream-level digital signal, where both M and N are integers greater than 1, and M is greater than N.
  • S520 Perform a second conversion process on the M-channel pre-transmitted antenna stream level digital signal to obtain an actual channel-level analog signal of the M-channel.
  • S530 performing third conversion processing on each channel of the actual channel-level analog signal of the M channel, and obtaining an actual antenna stream level digital signal of the M channel.
  • S540 performing fourth conversion processing on the actual antenna stream level digital signal of the M path, and obtaining N actual beam current level digital signals.
  • S550 Modeling the N pre-transmitted beam current level digital signal and the N actual beam current level digital signal to obtain a pre-distortion coefficient corresponding to each of the N pre-transmitted beam current level digital signals.
  • each of the pre-distortion coefficients is obtained according to the N-way pre-transmitted beam current level digital signal and the N-way actual beam current level digital signal.
  • S560 correct each path of the N pre-transmitted beam current level digital signals by using a corresponding pre-distortion coefficient of each of the N pre-transmitted beam stream-level digital signals to obtain N-corrected beam-level digital signals.
  • the calibration method provided by the embodiment of the present application not only improves the correction effect but also greatly simplifies the cost of the correction process by performing beam calibration on the beam stream level signal.
  • the modeling process used in the calibration method provided by the embodiment of the present application can uniformly perform nonlinear modeling processing on signals in the time domain and the air domain, thereby implementing unified correction of all N pre-transmitted beam current level signals, thereby It can improve the correction effect and improve the efficiency of the amplification process.
  • the second conversion process shown in FIG. 5 includes an enlargement process.
  • the second conversion process may further include an up-conversion process and a digital-to-analog conversion process.
  • modulation processing or the like is also included.
  • the second conversion process can be designed according to the actual design requirements of the transceiver, and one or more processes are added or removed, which is not limited in this application.
  • the third conversion process shown in FIG. 5 may be an analog to digital conversion process and a down conversion process. It is consistent with the description of the second conversion process, and the processing specifically included in the third conversion process may be increased or decreased according to actual needs, which is not limited in this application.
  • the third conversion process is processed by using an uplink.
  • the third conversion process shown in FIG. 5 may further include a selection process by which an actual channel-level analog signal of partial energy may be acquired.
  • the embodiment of the present application provides a computer storage medium for storing a program, which is used by the processor to execute the calibration method shown in FIG. 5 above.
  • the method steps described in connection with the disclosure of the present application may be implemented in a hardware manner, or may be implemented by a processor executing software instructions.
  • the software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art.
  • An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
  • the storage medium can also be an integral part of the processor.
  • the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a core network interface device.
  • the processor and the storage medium may also exist as discrete components in the core network interface device.
  • the present application further provides a computer storage medium, wherein the computer storage medium may store a program, and the program may include some or all of the steps in the embodiments of the correction method provided by the application.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (English: read-only memory, or ROM) or a random access memory (English: random access memory, RAM for short).

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Transmitters (AREA)
  • Radio Transmission System (AREA)

Abstract

La présente invention concerne, selon des modes de réalisation, un dispositif et un procédé de correction. Le dispositif de correction comprend : un premier circuit de commutation, un deuxième circuit de commutation, un troisième circuit de commutation, un quatrième circuit de commutation, un circuit de modélisation et un circuit de correction. L'utilisation du premier circuit de commutation et du quatrième circuit de commutation permet une commutation entre M signaux de classe de canal et N signaux de classe de flux de faisceau (N étant inférieur à M). En outre, un module de modélisation et un module de correction, exécutant une modélisation et une correction de classe de flux de faisceau sur le signal de classe de flux de faisceau, permettent d'améliorer sensiblement la précision de correction et de simplifier le dispositif de correction, ce qui réduit les coûts de correction ainsi que la complexité et le coût d'un récepteur.
PCT/CN2018/123636 2017-12-29 2018-12-25 Dispositif et procédé de correction WO2019129013A1 (fr)

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