CN109995393B - Correction device and method - Google Patents
Correction device and method Download PDFInfo
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- CN109995393B CN109995393B CN201711479349.8A CN201711479349A CN109995393B CN 109995393 B CN109995393 B CN 109995393B CN 201711479349 A CN201711479349 A CN 201711479349A CN 109995393 B CN109995393 B CN 109995393B
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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
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- 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
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- 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
Abstract
The embodiment of the application provides a correction device and a method, wherein the correction device comprises: the circuit comprises a first conversion circuit, a second conversion circuit, a third conversion circuit, a fourth conversion circuit, a modeling circuit and a correction circuit. By adopting the first conversion circuit and the fourth conversion circuit, the conversion (N is less than M) between the M-channel level signal and the N-channel beam flow level signal can be realized, and then the beam flow level signal is subjected to the modeling correction through the modeling module and the correction module, so that the correction precision can be greatly improved, the complexity of the correction device is greatly simplified, the realization is easier, the correction cost is further reduced, and the complexity and the cost of the transceiver are reduced.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a calibration apparatus and a calibration method.
Background
With the development of communication technology, more and more communication systems adopt multiple-input multiple-output (MIMO) technology or Massive MIMO technology, which improves system capacity by means of multiple antennas and multiple radio frequency channels integration, but with the rapid increase of the number of radio frequency channels and the improvement of communication frequency bands, how to improve the efficiency of MIMO/Massive MIMO transceivers becomes an urgent problem to be solved, and especially, the efficiency of Power Amplifiers (PAs) of MIMO/Massive MIMO transceivers needs to be improved.
The traditional method for improving the power amplification efficiency of the MIMO/Massive MIMO transceiver adopts a correction method to improve the efficiency of the power amplifier, specifically, a Digital pre-distortion (DPD) module is arranged on each radio frequency channel, and the power amplification efficiency is improved by correcting the power amplification power through the DPD module.
Disclosure of Invention
The application provides a correction device and a correction method, which are used for improving PA efficiency and reducing the complexity and cost of PA correction, thereby greatly reducing the complexity and hardware cost of a transceiver.
In a first aspect, the present application provides a calibration apparatus comprising: the circuit comprises a first conversion circuit, a second conversion circuit, a third conversion circuit, a fourth conversion circuit, a modeling circuit and a correction circuit.
And the first conversion circuit is used for performing first conversion processing on each of the N paths of pre-transmission beam current level digital signals to obtain M paths of pre-transmission antenna current level digital signals, wherein M and N are integers larger than 1, and M is larger than N.
And the second conversion circuit is used for carrying out second conversion processing on the M paths of pre-transmitting antenna stream-level digital signals to obtain M paths of actual channel-level analog signals.
And the third conversion circuit is used for performing third conversion processing on each path of the M paths of actual channel-level analog signals to obtain M paths of actual antenna stream-level digital signals.
And the fourth conversion circuit is used for performing fourth conversion processing on the M paths of actual antenna stream level digital signals to obtain N paths of actual beam stream level digital signals.
And the modeling circuit is used for modeling the N paths of pre-emitted beam current level digital signals and the N paths of actual beam current level digital signals to obtain a predistortion coefficient corresponding to each path of the N paths of pre-emitted beam current level digital signals.
The first conversion circuit or the fourth conversion circuit may utilize a 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 predistortion coefficient is obtained according to N paths of pre-emitted beam current level digital signals and N paths of actual beam current level digital signals.
And the correction circuit is used for correcting each path of the N paths of pre-emitted wave beam current level digital signals by using the pre-distortion coefficient corresponding to each path of the N paths of pre-emitted wave beam current level digital signals to obtain N paths of corrected beam current level digital signals.
Therefore, the first conversion circuit and the fourth conversion circuit can realize the conversion between M channel level signals and N path of beam flow level signals (N is less than M), and then the beam flow level signals are subjected to the modeling correction of the beam flow level through the modeling module and the correction module, so that the correction precision can be greatly improved, the complexity of the correction device is greatly simplified, the realization is easier, the correction cost is further reduced, and the complexity and the cost of the transceiver are reduced.
In a specific embodiment, the modeling process of the modeling circuit is a non-linear modeling process performed in the time domain and the space domain.
Therefore, through the time domain and space domain integrated modeling, the unified correction of two dimensions can be realized by adopting one modeling module, the correction precision can be improved, and the correction complexity and the realization cost are further simplified, namely the complexity and the realization cost of the transceiver are simplified.
In one particular embodiment, the second conversion circuit includes an up-conversion circuit, a digital-to-analog conversion circuit, and a power amplification circuit. Optionally, after the digital-to-analog conversion circuit and before the power amplification circuit, the second conversion circuit may further include a modulation circuit and the like. The second converting circuit may be designed according to the design requirement of the actual transceiver, and one or more circuits may be added or removed, which is not limited in this application. It can be seen that the second conversion circuit can be flexibly designed according to requirements.
In a specific embodiment, the third conversion circuit includes an analog-to-digital conversion circuit and a down-conversion circuit. Optionally, an attenuation circuit may be further included between the analog-to-digital conversion circuit and the down-conversion circuit to protect the respective circuits on the feedback link. The third converting circuit is as described above for the second converting circuit, and the specific circuits included in the third converting circuit may be increased or decreased according to actual needs, which is not limited in this application. Likewise, the third conversion circuit can be flexibly designed according to requirements.
In a particular embodiment, the third conversion circuit belongs to the uplink.
Thus, without setting a special feedback link for each downlink, the feedback signal is provided for the correction device by using only the existing uplink, thereby further reducing the complexity and cost of the correction device.
In a specific embodiment, the third conversion circuit further comprises a selection circuit for acquiring an actual channel-level analog signal of the partial energy. The selection circuit can be exemplified by a circulator or a single pole double throw switch, etc.
Therefore, 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 adopting an additional coupling circuit, and further feedback can be provided to the modeling circuit and the correction circuit, so that the correction can be realized. Particularly, when the feedback link is an uplink, a signal leaked to the uplink in a downlink time slot by using the selection circuit is used as a feedback signal, and the uplink is used as the feedback link, so that the characteristic that the uplink is idle in the downlink time slot is directly used without specially setting the feedback link, and the complexity and the cost of the correction device are greatly simplified.
In a second aspect, the present application provides a calibration method, specifically including the following method steps:
and performing first conversion processing on each of the N paths of pre-transmission wave beam current level digital signals to obtain M paths of pre-transmission antenna current level digital signals, wherein M and N are integers larger than 1, and M is larger than N.
And performing second conversion processing on the M paths of pre-transmitting antenna stream-level digital signals to obtain M paths of actual channel-level analog signals.
And performing third conversion processing on each path of the M paths of actual channel-level analog signals to obtain M paths of actual antenna stream-level digital signals.
And performing fourth conversion processing on the M actual antenna stream level digital signals to obtain N actual beam stream level digital signals.
And modeling the N paths of pre-emitted wave beam current level digital signals and the N paths of actual wave beam current level digital signals to obtain a pre-distortion coefficient corresponding to each path of the N paths of pre-emitted wave beam current level digital signals, wherein each pre-distortion coefficient is obtained according to the N paths of pre-emitted wave beam current level digital signals and the N paths of actual wave beam current level digital signals. And correcting each path of the N paths of pre-emitted wave beam current level digital signals by using the pre-distortion coefficient corresponding to each path of the N paths of pre-emitted wave beam current level digital signals to obtain N paths of corrected beam current level digital signals.
For possible implementation manners of the second aspect, reference is made to various possible implementation manners of the first aspect, and details are not repeated here.
In an alternative embodiment, the correction apparatus provided in the first aspect and the correction method provided in the second aspect are applicable to a time division duplex communication system, and by using a downlink as a feedback link, correction within an operating bandwidth range, which may also be referred to as in-band correction, can be achieved, which is a significant saving in bandwidth compared with a conventional third-order (bandwidth) correction.
In a third aspect, the present application provides a radio frequency system, including the calibration apparatus of the first aspect and any possible implementation manner of the first aspect.
In a fourth aspect, the present application provides a baseband system including the correction apparatus of the first aspect and any possible implementation manner of the first aspect.
In a fifth aspect, the present application provides an access network device, including the correction apparatus in any possible implementation manner of the above first aspect and the first aspect, and/or the above third aspect and the third aspect, and/or the above fourth aspect and the fourth aspect baseband system.
In a sixth aspect, the calibration device provided herein may be a radio frequency system. Illustratively, the remote radio unit can be a radio remote unit.
In a seventh aspect, the correction apparatus provided in the present application may be a baseband system. Illustratively, it may be a baseband unit.
In an eighth aspect, the correction apparatus provided in the present application may be an access network device. Illustratively, it may be a base station.
In a ninth aspect, the present application provides a computer storage medium for storing a program for performing the correction method of the second aspect above and any one of the possible embodiments of the second aspect when the program is called by a processor.
The beneficial effects of any possible implementation manner of any one of the second aspect to the ninth aspect may refer to the corresponding description of the first aspect, and are not repeated herein.
Drawings
FIG. 1 is a basic diagram of a transceiver calibration provided herein;
FIG. 2 is a schematic diagram of a calibration device 200 according to the present application;
FIG. 3 is a schematic diagram of a calibration apparatus 300 according to the present disclosure;
FIG. 4 is a schematic diagram of an application of a calibration apparatus 400 provided in the present application;
fig. 5 is a flowchart of a calibration method provided in the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
In this application, "plurality" means two or more, and other terms are similar. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The access network device may be a Base Station (BS) or a Base Transceiver Station (BTS), which is a device deployed in a radio access network to provide a wireless communication function for a terminal device. In systems using different radio access technologies, the names of devices with base station functions may be different, for example, in an LTE network, referred to as an evolved node B (eNB or eNodeB), in a third generation communication (3G) network, referred to as a node B (node B), or applied in a fifth generation communication system, etc. For convenience of description, the above-mentioned devices with base station functions are collectively referred to as access network devices in this application.
The basic principle of transceiver calibration is described below with reference to fig. 1, where fig. 1 is a schematic diagram of calibration of a transceiver system, and a digital signal to be transmitted shown in the diagram is divided into two paths, one path enters a DPD module, and the other path enters an adapter, where the DPD module performs digital predistortion processing on the digital signal to be transmitted according to a predistortion coefficient provided by the adapter. The predistortion processing refers to processing opposite to downlink nonlinear characteristics including a PA. The DPD module outputs a predistortion digital signal after performing predistortion processing on a digital signal to be transmitted; a digital-to-analog converter (DAC) converts the predistorted digital signal into a low-frequency or intermediate-frequency analog signal, and then an up-converter converts the low-frequency or intermediate-frequency analog signal into a radio-frequency signal, and the radio-frequency signal is amplified and output by a PA. Wherein, the signal output by the PA can be restored to the signal input by the DAC, i.e. to no actual signal, because the nonlinear characteristic of the PA is exactly opposite to the predistortion characteristic.
The PA output signal is divided into two paths, most signals of the two paths reach the antenna and are transmitted to a wireless space by the antenna; a small part of signals are sent to a feedback channel through a coupler, the signals in the feedback channel are sent to an analog-to-digital converter (ADC) after being subjected to down-conversion, the ADC converts the signals into digital signals, namely feedback digital signals, and then the digital signals are sent to an adaptive device; the self-adapting device calculates a predistortion coefficient according to a digital signal to be transmitted and a feedback digital signal, and transmits the calculated predistortion coefficient to the DPD module. The DPD module performs predistortion processing on a subsequently input digital signal to be transmitted according to the predistortion coefficient from the self-adaptive device, and the cycle can be realized.
Fig. 1 illustrates only one downlink and one feedback link, and when there are multiple downlinks, each downlink needs to be provided with a DPD module separately, and each downlink needs to be provided with a corresponding feedback link. In the face of more and more downlinks in the future, such as a MIMO system, the corrected system becomes more and more complex, and the cost also doubles with the increase of downlinks.
Therefore, the embodiments of the present application provide a calibration apparatus, which can reduce the cost of the transceiver and improve the working efficiency of the transceiver, especially the efficiency of the power amplifier. The main ideas provided by the application are as follows: in a communication system including N downlinks, digital predistortion correction of a beam stream level signal is achieved by providing a beam correction circuit, a first conversion circuit, a fourth conversion circuit, and a modeling circuit between the downlinks and a feedback link. The first conversion circuit is used for performing first conversion processing on each of the N paths of pre-transmission beam current level signals to obtain M paths of pre-transmission antenna current level signals. And the set fourth conversion circuit is used for performing fourth conversion processing on the M paths of actual antenna stream level signals output by the PA to obtain N paths of actual beam stream level signals. The modeling circuit is used for modeling the N paths of pre-emitted wave beam current level signals and the N paths of actual wave beam current level signals to obtain a pre-distortion coefficient corresponding to each path of the N paths of pre-emitted wave beam current level signals. And each predistortion coefficient is obtained according to the N paths of pre-emitted beam current level digital signals and the N paths of actual beam current level digital signals. The correction circuit is used for correcting each path of the N paths of pre-emitted wave beam current level signals by using the pre-distortion coefficient corresponding to each path of the N paths of pre-emitted wave beam current level signals to obtain N paths of corrected beam current level digital signals. The corrected beam stream level digital signal in this application may also be referred to as a (corrected) pre-distorted beam stream level digital signal. The first conversion circuit or the fourth conversion circuit may utilize a 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.
It can be seen from the above that, by using the first conversion circuit and the fourth conversion circuit, the conversion between the channel-level signals and the less number of beam stream-level signals can be realized, and then the beam stream-level signals are subjected to the beam stream-level modeling correction through the modeling module and the correction module, so that the correction precision can be greatly improved, the complexity of the correction device is greatly simplified, the correction device is easier to realize, and the correction cost is further reduced.
Optionally, the feedback link may be implemented by using an uplink as a feedback link, so that a dedicated feedback link is not required to be provided for each downlink, thereby further reducing the complexity and cost of the correction apparatus.
Fig. 2 shows a schematic diagram of a calibration device 200 provided by the present application, which comprises: a first conversion circuit 10, a second conversion circuit 20, a third conversion circuit 30, a fourth conversion circuit 40, a modeling circuit 50, and a correction circuit 60.
Wherein the downlink comprises in sequence: the first conversion circuit 10, the second conversion circuit 20 and the correction circuit 60, and the feedback link sequentially includes a third conversion circuit 30 and a fourth conversion circuit 40. The modeling circuit 50 is disposed between the downlink and the feedback link.
And the first conversion circuit 10 is configured to perform first conversion processing on each of the N pre-transmit beam current level digital signals to obtain M pre-transmit antenna current level digital signals. Wherein M and N are integers greater than 1, and M is greater than or equal to N.
The second conversion circuit 20 is configured to perform second conversion processing on the M paths of pre-transmit antenna stream-level digital signals to obtain M paths of actual channel-level analog signals.
The third conversion circuit 30 is configured to perform third conversion processing on each of the M actual channel-level analog signals to obtain M actual antenna-level digital signals.
And the fourth conversion circuit 40 is configured to perform fourth conversion processing on the M actual antenna stream level digital signals to obtain N actual beam stream level digital signals.
And the modeling circuit 50 is configured to perform modeling processing on the N paths of pre-emitted beam current level digital signals and the N paths of actual beam current level digital signals to obtain a predistortion coefficient corresponding to each path of the N paths of pre-emitted beam current level digital signals. And modeling each predistortion coefficient, wherein each predistortion coefficient is obtained according to the N paths of pre-emitted beam current level digital signals and the N paths of actual beam current level digital signals.
For example, the modeling circuit 50 may perform the modeling process according to the following equation:
wherein i represents each carrierJ represents the carrier number, where k is a modeling parameter preset according to the PA performance, and preset ki e [ -3,3]，kj∈[-3,3]，
A non-linear error (alpha) corresponding to a pre-emitted beam level digital signal of the ith beam of the jth carrierki,kj，βki,kj，σki,kj) A predistortion coefficient corresponding to a digital signal of a pre-emitted beam level of an ith beam of a jth carrier, SifjThe actual beam current level digital signal of the ith beam current of the jth carrier wave passes through the acquired beam current level digital signal
SifjAnd Si+kifj+kjSo as to extract the predistortion coefficient (alpha) corresponding to each path of digital signals of the pre-emitted beam levelki,kj，βki,kj，σki,kj) Then the modeling circuit 50 will again model the (α) of each wayjik,，βki,kj，σki,kj) And a correction circuit 60 corresponding to the ith beam stream transmitted to the corresponding jth carrier. The number of paths of all the pre-transmitted beam stream level digital signals is N, and N is i.
As can be seen from the above, the predistortion coefficient corresponding to each path of the pre-transmitted beam stream level digital signal is associated with all the N paths of the pre-transmitted beam stream level digital signals and all the N paths of the actual beam stream level digital signals.
It should be noted that the modeling provided in the embodiments of the present application is only an example, and the present application is within the protection scope as long as the predistortion coefficients are obtained from all the pre-emission beam level signals and all the actual beam level signals.
And the correcting circuit 60 is configured to correct each of the N paths of pre-emitted beam current level digital signals by using a pre-distortion coefficient corresponding to each of the N paths of pre-emitted beam current level digital signals, so as to obtain N paths of corrected beam current level digital signals.
As can be seen from the above, the first conversion circuit 10 and the fourth conversion module 40 can convert between N channels of beam stream level signals and M channels of antenna stream level signals, where the number N of channels of the beam stream level is smaller than the number M of channels of the antenna stream level signals, for example, in many MIMO scenarios, the size of N is much smaller than M. Therefore, by correcting the beam stream level signals, the number of correction circuits is greatly reduced, and the correction complexity and cost are reduced. In addition, by carrying out beam flow level modeling on the beam flow level signals, namely, each path of predistortion coefficient is associated with all the pre-emission beam level digital signals and all the actual beam flow level digital signals, the error correlation among the beam flow level signals of each path is increased, and thus the correction precision of each path of signals is improved.
In an embodiment, the second converting circuit 20 includes a power amplifying circuit, please refer to fig. 3, which is a schematic diagram of a correcting apparatus 300 according to an embodiment of the present disclosure.
Optionally, the second conversion circuit 20 may further include an analog-to-digital conversion circuit and/or an up-conversion circuit (not shown). Optionally, the second conversion circuit 20 may further include a modulation circuit and the like after the digital-to-analog conversion circuit and before the power amplification circuit. The second switching circuit 20 may be designed according to the design requirement of the actual transceiver, and one or more circuits may be added or removed, which is not limited in this application.
In one embodiment, the calibration apparatus shown in fig. 3 is applied to a Time-Division duplex (TDD) communication system. The third conversion circuit 30 shown in fig. 3 includes a selection circuit 310, and optionally further includes an analog-to-digital conversion circuit 320, and/or a down-conversion circuit 330. The third converting circuit 30 is described in the same way as the second converting circuit 20, and the specific circuits included in the third converting circuit 30 may be increased or decreased according to actual needs, which is not limited in this application. By means of the selection circuit 310, an uplink can thus be selected as a feedback link for the correction device. For example, the selection circuit may be a circulator, when the system where the correction device shown in fig. 3 is located is in a downlink time slot, a signal leaked to the uplink in the downlink time slot by the circulator may be used as a feedback signal, and at the same time, the uplink is used as a feedback link, so that a feedback link does not need to be specially configured for the correction device 300, and the characteristic that the uplink is idle in the downlink time slot is directly used, thereby greatly simplifying the complexity and cost of the correction device. Therefore, the downlink is used as the feedback link, and the working frequency bands of the TDD uplink and the TDD downlink are the same, so that the intra-bandwidth correction of the working frequency band can be realized.
For a clearer understanding of the calibration apparatus provided in the embodiments of the present application, the calibration of multiple beam current level signals will be further described below, please refer to fig. 4, which is a schematic diagram of an application of the calibration apparatus 400 provided in the present application, where the communication system shown in fig. 4 is a communication system with N carriers, and each carrier has only one beam current level signal, so that the N carriers count N pre-emitted beam current level digital signals, that is, fig. 4 is a schematic diagram of calibrating the N pre-emitted beam current level digital signals. Referring to the correction processing of the 1 st path of pre-emitted wave beam level digital signal shown in fig. 4, the 1 st path of pre-emitted wave beam level digital signal is multiplied by the predistortion coefficient by the 1 st path of correction circuit 60, so that a corrected predistortion beam level digital signal is obtained, and the corrected predistortion beam level digital signal is further transmitted to the PA in the downlink, thereby realizing the correction of the PA, improving the working efficiency of the PA, and further improving the working efficiency of the transceiver.
The working mechanism of the calibration apparatus 400 is specifically as follows: the first conversion circuit 10 of the 1 st path converts the digital signal of the 1 st path of pre-emitted beam level into digital signal of the M paths of antenna level; each path of the antenna flow-level digital signals of the M paths is mapped to the M paths of channels through up-conversion processing to obtain M paths of channel-level digital radio-frequency signals, wherein the 1 st path of antenna flow-level digital signals converted from each path of beam flow-level signals are up-converted and converged into one path of channel-level signals, namely the 1 st path of channel-level digital radio-frequency signals, and the acquisition of the 2 nd path and the Nth path of ground channel-level digital radio-frequency signals is the same as the 1 st path of channel-level digital radio-frequency signals, which is not described herein again; the 1 st channel-level digital radio-frequency signal is converted into a 1 st channel-level analog radio-frequency signal through the 1 st DAC; the 1 st channel-level analog radio frequency signal is amplified by a Power Amplifier (PA) to obtain a 1 st actual channel-level analog radio frequency signal; the 1 st channel-level analog radio frequency signal passes through the circulator 310, wherein most of the actual channel-level analog radio frequency signal is transmitted through the 1 st channel antenna, and a small part of the actual channel-level analog radio frequency signal leaks to the ADC of the 1 st channel uplink, so as to obtain the 1 st channel-level digital radio frequency signal; the actual channel-level digital radio-frequency signals of the 1 st path are subjected to down-conversion processing and are respectively mapped to the 1 st path antenna flow-level signals of each beam flow level, so that signals of each 1 st path antenna flow level corresponding to the N to-be-transmitted beam flow-level digital signals are obtained, the signals are actual antenna flow-level digital signals of M paths, and then the actual antenna flow-level digital signals of the M paths corresponding to the pre-transmitted beam flow-level digital signals of the 1 st path are processed by the fourth conversion module 40 of the 1 st path and are converted into actual beam flow-level digital signals of the 1 st path; the modeling module 50 compares and models the 1 st pre-emitted beam current level digital signal and the 1 st actual beam current level digital signal, calculates and obtains the nonlinear error of the beam current level digital signal of the path, and so on, the modeling calculation method of the nonlinear error of the beam current level digital signals of the 2 nd path, the 3 rd path and the N th path is the same as the nonlinear error of the beam current level digital signal of the 1 st path; further, the modeling module 50 models the non-linear errors corresponding to all the N beam stream level digital signals, that is, the non-linear errors corresponding to all the N beam stream level digital signals are used as parameters to calculate the predistortion coefficients of each path by modeling, that is, the predistortion coefficients of each path are all related to the non-linear errors of all the N paths; the modeling module 50 then outputs the predistortion coefficients of each path to the correction module 60 of the corresponding path, for example, outputs the predistortion coefficients of the 1 st path to the correction module 60 of the 1 st path.
Therefore, the 1 st path pre-emitted wave beam level digital signal is corrected by using the 1 st path pre-distortion coefficient, the 1 st path pre-distorted wave beam level digital signal can be obtained, and the 1 st path pre-emitted wave beam level digital signal is corrected. Similarly, the digital signals of the pre-emitted beam level of other paths can be corrected in the same way, and are not described herein again. Thereby achieving beam-level correction of the overall beam-level digital signal of the system shown in fig. 4.
As can be seen from the above, the non-linear correction can be performed on the PAs of M downlinks by using 1 modeling module 50 and N correction circuits 60, and since N is smaller than M, the correction cost is greatly saved. In addition, only 1 modeling module 50 is needed to realize the correction of all the N paths of beam stream level digital signals, and by adopting the beam stream level modeling device provided by the application, namely the predistortion coefficient of each path is related to the nonlinear error amount of all the N paths of beam stream level signals, so that all the beam stream level signals are uniformly modeled, and thus all the beam stream level signals can be uniformly corrected.
Alternatively, the circulator 320 in the above embodiment may be a single-pole double-throw switch, one of the output terminals of which may be connected to the antenna through the filter, and the other output terminal of which is connected to the uplink. When the single-pole double-throw switch is used for conducting a downlink, a small part of signals can be leaked to an uplink, so that the uplink can be used as a feedback link, the complexity of a correction device can be saved, and the cost can be saved.
In the embodiment shown in fig. 4, each carrier transmits a single-stream beam stream level signal, and optionally, each carrier may also transmit a multi-stream beam stream level signal, where this scenario is only to increase the number of paths of the beam stream level signal that needs to be corrected, and the specific correction principle is the same as that shown in the above embodiment, and is not described here again. The number of streams and the number of carriers of the beam stream level signal transmitted by each carrier are not limited in the present application.
It can be seen from the foregoing embodiments that the calibration device provided by the present application effectively reduces the calibration cost and the complexity of the calibration device, thereby further reducing the cost and the complexity of the transceiver. The embodiment of the application provides a correction system, which comprises the correction device provided by any one of the embodiments.
An embodiment of the present application provides a radio frequency system, including the calibration apparatus provided in any one of the above embodiments, and/or the calibration system provided in the embodiment.
Embodiments of the present application provide a baseband system, including the correction device provided in any of the above embodiments, and/or the correction system provided in an embodiment.
An embodiment of the present application provides an access network device, including the calibration apparatus provided in any of the above embodiments, and/or the calibration system provided in the embodiment, and/or the radio frequency system provided in the embodiment.
Optionally, the calibration apparatus provided in the embodiments of the present application may be a radio frequency system, which may be, for example, a radio remote unit.
Optionally, the correction apparatus provided in this embodiment of the present application may be a baseband system, and may be, for example, a baseband unit.
Optionally, the correction apparatus provided in this embodiment of the present application may be an access network device, which may be a base station, for example.
In addition, an embodiment of the present application provides a calibration method, please refer to fig. 5, which is a flowchart of the calibration method provided in the present application, and the method includes:
s510: and performing first conversion processing on each of the N paths of pre-transmission wave beam current level digital signals to obtain M paths of pre-transmission antenna current level digital signals, wherein M and N are integers larger than 1, and M is larger than N.
S520: and performing second conversion processing on the M paths of pre-transmitting antenna stream-level digital signals to obtain M paths of actual channel-level analog signals.
S530: and performing third conversion processing on each path of the M paths of actual channel-level analog signals to obtain M paths of actual antenna stream-level digital signals.
S540: and performing fourth conversion processing on the M actual antenna stream level digital signals to obtain N actual beam stream level digital signals.
S550: and modeling the N paths of pre-emitted wave beam level digital signals and the N paths of actual wave beam level digital signals to obtain a pre-distortion coefficient corresponding to each path of the N paths of pre-emitted wave beam level digital signals.
And each predistortion coefficient is obtained according to the N paths of pre-emitted beam current level digital signals and the N paths of actual beam current level digital signals.
S560: and correcting each path of the N paths of pre-emitted wave beam current level digital signals by using the pre-distortion coefficient corresponding to each path of the N paths of pre-emitted wave beam current level digital signals to obtain N paths of corrected beam current level digital signals.
According to the correction method provided by the embodiment of the application, the beam flow level is subjected to modeling correction by carrying out the beam flow level on the beam flow level signal, so that the correction effect is improved, and the correction processing cost is greatly reduced.
It should be noted that the modeling processing adopted by the correction method provided in the embodiment of the present application can uniformly perform nonlinear modeling processing on the signals in the time domain and the space domain, and realize uniform correction on all N pre-emitted beam current level signals, so that the correction effect can be improved, and the amplification processing efficiency can be improved.
The second conversion process shown in fig. 5 includes an enlargement process. Optionally, the second conversion process may further include an up-conversion process and a digital-to-analog conversion process. For another example, after the digital-to-analog conversion process and before the amplification process, a modulation process and the like are also included. The second conversion process may be designed according to the design requirement of the actual transceiver, and one or more processes may be added or removed, which is not limited in this application.
Alternatively, the third conversion process shown in fig. 5 may be an analog-to-digital conversion process and a down-conversion process. Consistent with the description of the second conversion process, the processes specifically included in the third conversion process may be increased or decreased according to actual needs, which is not limited in this application.
Optionally, the third conversion process is processed using an uplink.
Optionally, the third conversion process shown in fig. 5 may further include a selection process by which an actual channel-level analog signal of a portion of the energy may be acquired.
The beneficial effects of the above method embodiments are the same as those described in the above device embodiments, and are not described herein again.
The present embodiment provides a computer storage medium for storing a program for executing the above correction method shown in fig. 5 when the program is called by a processor.
The method steps described in connection with the present disclosure may be embodied in hardware or may be embodied in software instructions executed by a processor. The software instructions may be comprised of corresponding software modules that may be stored in Random Access Memory (RAM), flash Memory, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), registers, a hard disk, a removable disk, a compact disc Read Only Memory (CD-ROM), or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a core network interface device. Of course, the processor and the storage medium may reside as discrete components in a core network interface device.
In specific implementation, the present application further provides a computer storage medium, where 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 in the present application when executed. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM) or a Random Access Memory (RAM).
Those skilled in the art will readily appreciate that the techniques of this application may be implemented in software plus any necessary general purpose hardware platform. Based on such understanding, the technical solutions in the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a VPN gateway, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present application.
The same and similar parts in the various embodiments in this specification may be referred to each other. In particular, as for the method embodiment, since it is substantially similar to the apparatus embodiment, the description is simple, and the relevant points can be referred to the description in the apparatus embodiment.
The above-described embodiments of the present application do not limit the scope of the present application.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.
Claims (10)
1. A method of calibration, the method comprising:
performing first conversion processing on each path of the N paths of pre-transmission wave beam current level digital signals to obtain M paths of pre-transmission antenna current level digital signals, wherein M and N are integers larger than 1, and M is larger than N; performing second conversion processing on the M paths of pre-transmitting antenna stream-level digital signals to obtain M paths of actual channel-level analog signals;
performing third conversion processing on each path of the M paths of actual channel-level analog signals to obtain M paths of actual antenna stream-level digital signals;
performing fourth conversion processing on the M actual antenna stream level digital signals to obtain N actual beam stream level digital signals;
modeling the N paths of pre-emitted wave beam current level digital signals and the N paths of actual wave beam current level digital signals to obtain a pre-distortion coefficient corresponding to each path of the N paths of pre-emitted wave beam current level digital signals, wherein each pre-distortion coefficient is obtained according to the N paths of pre-emitted wave beam current level digital signals and the N paths of actual wave beam current level digital signals; correcting each path of the N paths of pre-emitted wave beam current level digital signals by using a pre-distortion coefficient corresponding to each path of the N paths of pre-emitted wave beam current level digital signals to obtain N paths of corrected wave beam current level digital signals;
wherein the modeling processing is nonlinear modeling processing performed on a time domain and a space domain;
wherein the first conversion processing and the fourth conversion processing are realized by a matrix conversion circuit;
the second conversion processing comprises up-conversion processing, digital-to-analog conversion processing and amplification processing;
wherein the third conversion process includes an analog-to-digital conversion process and a down-conversion process.
2. The correction method of claim 1, wherein the third conversion process is performed using an uplink.
3. The correction method according to any one of claims 1 to 2, wherein said third conversion process further comprises a selection process for obtaining said actual channel-level analog signal of partial energy.
4. A calibration device, characterized in that the device comprises: the circuit comprises a first conversion circuit, a second conversion circuit, a third conversion circuit, a fourth conversion circuit, a modeling circuit and a correction circuit; the first conversion circuit is used for performing first conversion processing on each of the N paths of pre-transmission beam current level digital signals to obtain M paths of pre-transmission antenna current level digital signals, wherein M and N are integers greater than 1, and M is greater than N;
the second conversion circuit is used for performing second conversion processing on the M paths of pre-transmission antenna stream-level digital signals to obtain M paths of actual channel-level analog signals;
the third conversion circuit is configured to perform third conversion processing on each of the M actual channel-level analog signals to obtain M actual antenna stream-level digital signals;
the fourth conversion circuit is configured to perform fourth conversion processing on the M actual antenna stream level digital signals to obtain N actual beam stream level digital signals;
the modeling circuit is configured to perform modeling processing on the N paths of pre-emitted beam current level digital signals and the N paths of actual beam current level digital signals to obtain a predistortion coefficient corresponding to each path of the N paths of pre-emitted beam current level digital signals, where each predistortion coefficient is obtained according to the N paths of pre-emitted beam current level digital signals and the N paths of actual beam current level digital signals;
the correction circuit is used for correcting each path of the N paths of pre-emitted wave beam current level digital signals by using a pre-distortion coefficient corresponding to each path of the N paths of pre-emitted wave beam current level digital signals to obtain N paths of corrected wave beam current level digital signals;
wherein the modeling processing of the modeling circuit is nonlinear modeling processing of a time domain and a space domain;
the first conversion circuit and the fourth conversion circuit are matrix conversion circuits, or the first conversion circuit and the fourth conversion circuit comprise matrix conversion circuits;
the second conversion circuit comprises an up-conversion circuit, a digital-to-analog conversion circuit and a power amplification circuit;
the third conversion circuit comprises an analog-to-digital conversion circuit and a down-conversion circuit.
5. The correction apparatus of claim 4, wherein the third conversion circuit is of an uplink.
6. The correction device of any one of claims 4 to 5, wherein said third conversion circuit further comprises a selection circuit for obtaining said actual channel-level analog signal of a portion of energy.
7. A calibration device, characterized in that it comprises all the features of the calibration device according to any one of claims 4 to 5, wherein the calibration device is a radio frequency unit.
8. A correction device, characterized in that it comprises all the features of the correction device according to any of claims 4 to 6, wherein it further comprises a baseband unit.
9. A correction device, characterized in that it comprises all the features of any one of claims 4 to 6, wherein said correction device is an access network equipment.
10. A computer storage medium for storing a program for performing a correction method according to any one of claims 1 to 3 when the program is called by a processor.
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| CN103248597A (en) * | 2013-05-17 | 2013-08-14 | 上海无线通信研究中心 | Self-adaptive digital pre-distortion system based on reference signal and initialization correction method |
| CN107294546A (en) * | 2017-05-09 | 2017-10-24 | 华南理工大学 | Radio frequency link and its method of work in a kind of digital pre-distortion system |
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| CN101155158A (en) * | 2006-09-25 | 2008-04-02 | 大唐移动通信设备有限公司 | Baseband predistortion device and method |
| CN101159458A (en) * | 2007-11-15 | 2008-04-09 | 中兴通讯股份有限公司 | Digital predistortion system and method |
| CN102204200A (en) * | 2011-04-18 | 2011-09-28 | 华为技术有限公司 | Digital analog predistortion processing apparatus, signal transmission system and signal transmission method |
| US9647735B2 (en) * | 2013-05-31 | 2017-05-09 | Intel IP Corporation | Hybrid digital and analog beamforming for large antenna arrays |
| CN104580060B (en) * | 2015-01-20 | 2018-09-14 | 重庆邮电大学 | A kind of the digital pre-distortion means for correcting and method of the distortion of IQ imbalances |
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| CN103248597A (en) * | 2013-05-17 | 2013-08-14 | 上海无线通信研究中心 | Self-adaptive digital pre-distortion system based on reference signal and initialization correction method |
| CN107294546A (en) * | 2017-05-09 | 2017-10-24 | 华南理工大学 | Radio frequency link and its method of work in a kind of digital pre-distortion system |
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