WO2019129013A1

WO2019129013A1 - Correction device and method

Info

Publication number: WO2019129013A1
Application number: PCT/CN2018/123636
Authority: WO
Inventors: 洪艺伟
Original assignee: 华为技术有限公司
Priority date: 2017-12-29
Filing date: 2018-12-25
Publication date: 2019-07-04
Also published as: CN109995393A; CN109995393B

Abstract

Embodiments of the present application provide a correction device and method. The correction device comprises: a first switching circuit, a second switching circuit, a third switching circuit, a fourth switching circuit, a modeling circuit and a correction circuit. Using the first switching circuit and the fourth switching circuit enables switching between M channel class signals and N beam stream class signals (N being less than M). Further, a modeling module and a correction module executing beam stream class modeling and correction on the beam stream class signal can substantially improve correction precision and simplify the correction device, reducing correction costs and the complexity and cost of a receiver.

Description

Correction device and method

This application claims the priority of the Chinese Patent Application No. PCT Application No. No. No. No. No. No. No. No. No. No. No. in.

Technical field

The present application relates to the field of communications technologies, and in particular, to a calibration apparatus and method.

Background technique

With the development of communication technologies, more and more communication systems use multiple-input multiple-output (MIMO) technology or massive multiple access multiple-output (Massive MIMO) technology, which Multiple RF channels are integrated to increase system capacity. However, as the number of RF channels increases sharply and the communication band increases, how to improve the efficiency of MIMO/Massive MIMO transceivers becomes an urgent problem to be solved, especially the need to improve MIMO/Massive MIMO Transceiver Power Amplifier (PA) efficiency.

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. Specifically, 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. To improve the efficiency of the amplifier, but with the large number of RF channels of the MIMO/Massive MIMO transceiver, each radio channel introduces a DPD module, which will bring severe challenges to the bandwidth and cost of the transceiver.

Summary of the invention

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.

In a first aspect, 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.

Wherein, 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.

Wherein, 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 .

It can be seen that by using 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.

In a specific embodiment, the modeling process of the modeling circuit is a nonlinear modeling process for the time domain and the spatial domain.

It can be seen that by modeling the integration of time domain and airspace, a two-dimensional unified correction can be realized by using a modeling module, which not only improves the calibration accuracy, but also further simplifies the correction complexity and implementation cost, that is, simplification. The complexity and implementation cost of the transceiver.

In a specific embodiment, the second conversion circuit includes an up conversion circuit, a digital to analog conversion circuit, and a power amplification circuit. Alternatively, 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.

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 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.

In a specific embodiment, the third conversion circuit belongs to the uplink.

Thus, there is no need to provide a dedicated feedback link for each downlink, and the feedback device is provided with the feedback signal using only the off-the-shelf uplink, thereby further reducing the complexity and cost of the calibration device.

In a specific embodiment, the third conversion circuit further includes 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.

It can be seen that 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. In order to achieve this correction. In particular, when 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.

In a second aspect, the present application provides a calibration method, which specifically includes the following method steps:

Performing a first conversion process on each of the N-channel pre-transmitted beam current-level digital signals to obtain an M-channel pre-transmitted antenna stream-level digital signal, wherein both M and N are integers greater than 1, and M is greater than N.

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.

Perform a third conversion process on each channel of the actual channel-level analog signal of the M-path to obtain an actual antenna-level digital signal of the M-channel.

Performing a fourth conversion process on the actual antenna stream level digital signal of the M path to obtain N actual beam current level digital signals.

Modeling and processing N pre-transmitted beam current level digital signals and N actual beam current level digital signals, and obtaining pre-distortion coefficients corresponding to each of N pre-transmitted beam current level digital signals, wherein each pre-distortion The coefficients are obtained from N pre-transmitted beam current level digital signals and N actual beam current level digital signals. 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.

For possible implementation manners of the second aspect, refer to the foregoing possible implementation manners of the first aspect, and details are not described herein again.

In an optional implementation manner, 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.

In a third aspect, 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.

In a fourth 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.

In a fifth 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.

In a sixth aspect, the correction device provided by the present application may be a radio frequency system. For example, it may be a radio remote unit.

In a seventh aspect, the correction device provided by the present application can be a baseband system. For example, it may be a baseband unit.

In an eighth aspect, the correction device provided by the present application may be an access network device. For example, it can be a base station.

In a ninth aspect, 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.

For the beneficial effects of the foregoing possible aspects of the second aspect to the ninth aspect, reference may be made to the corresponding description of the above first aspect, and details are not described herein again.

DRAWINGS

1 is a basic schematic diagram of a transceiver calibration provided by the present application;

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;

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.

Detailed ways

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

In the present application, "plurality" 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. In systems using different radio access technologies, 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. In a communication (3G) network, it is called a Node B, or it is applied to a fifth-generation communication system or the like. 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.

The basic principle of transceiver correction is introduced below with reference to FIG. 1. 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. Among them, since the PA nonlinear characteristic is exactly opposite to the predistortion characteristic, the signal output by the PA can be restored to the signal input by the DAC, that is, restored to an unrealistic signal.

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. When there are multiple downlinks, each downlink needs to be separately set up with a DPD module, and each downlink needs to set a corresponding feedback link. . In the face of more and more downlinks in the future, such as MIMO systems, the corrected system becomes more and more complex, and the cost increases exponentially with the increase of the downlink.

Therefore, 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 is provided 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. Wherein, 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.

It can be seen that by using 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.

Optionally, 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. Wherein 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.

For example, the modeling circuit 50 can perform modeling processing according to the following formula:

Where i denotes the beam stream number of each carrier, j denotes the carrier number, where 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,

The pre-distortion coefficient corresponding to the pre-transmitted beam stream level digital signal of the i-th beam stream of the j-th carrier, and 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 (α _{ki, kj} , β _{ki, kj} , σ _{ki, kj} ) corresponding to each pre-transmitted beam current level digital signal can be extracted, and then The modeling circuit 50 then transmits (α _ki,kj , β _ki,kj , σ _ki,kj ) of each path to the correction circuit 60 corresponding to the i-th beam stream of the corresponding j-th carrier. The number of paths of the all pre-transmitted beam stream level digital signals is N, N=i*j.

It can be seen that 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.

It should be noted that the modeling provided by the embodiment of the present application is only an example, as long as the pre-distortion coefficients are obtained according to all pre-transmitted beam stream level signals and all actual beam stream level signals, which are all within the protection scope of the present application.

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.

It can be seen that 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. In addition, 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. In addition, by modeling the beam current level of the beam current level signal, that is, 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.

In an embodiment, the second conversion circuit 20 includes a power amplification circuit. Please refer to FIG. 3 , which is a schematic diagram of a calibration apparatus 300 according to an embodiment of the present application.

Optionally, the second conversion circuit 20 may further include an analog to digital conversion circuit and/or an up conversion circuit (not shown). Alternatively, 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.

In one embodiment, 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. By selecting circuit 310, the uplink can be selected as the feedback link for the correction device. For example, the selection circuit may be a circulator. When the system in which the calibration device shown in FIG. 3 is located is in a downlink time slot, 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. By using the uplink as a feedback link, it is not necessary to specifically set a feedback link for the correction device 300, and directly utilize the feature of uplink idleness in the downlink time slot, thereby greatly simplifying the complexity and cost of the correction device. It can be seen that by using 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.

For a clearer understanding of the correction device provided by the embodiment of the present application, the following is a further description of the correction of the multi-channel beam-level signal. Please refer to FIG. 4 , which 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. 4, 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. And synthesizing one channel-level signal, that is, the channel-level digital radio frequency signal of the first channel, and the channel-level digital radio frequency signal of the second channel and the Nth channel are the same as the channel-level digital radio frequency signal of the first channel, and are not described herein again; 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, Then, 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.

Therefore, by correcting the first pre-transmitted beam current level digital signal by using the pre-distortion coefficient 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. Similarly, 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.

It can be seen that 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. In addition, 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.

Optionally, 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. When 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.

In the embodiment shown in FIG. 4, each carrier transmits a single stream beam stream level signal. Alternatively, 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.

As can be seen from the various embodiments described above, 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.

Optionally, the calibration device provided by the embodiment of the present application may be a radio frequency system. For example, it may be a radio remote unit.

Optionally, the correction device provided by the embodiment of the present application may be a baseband system, and may be a baseband unit.

Optionally, the correcting device provided by the embodiment of the present application may be an access network device. For example, it may be a base station.

In addition, the embodiment of the present application provides a calibration method. Please refer to FIG. 5 , which 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.

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.

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.

It should be noted that 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. 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 processing and before the amplification processing, 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.

Alternatively, 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.

Optionally, the third conversion process is processed by 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 partial energy may be acquired.

The beneficial effects of the above method embodiments are the same as those of the above device embodiments, and are not described herein again.

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. Of course, 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. Of course, the processor and the storage medium may also exist as discrete components in the core network interface device.

In a specific implementation, 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).

Those skilled in the art will clearly understand that the techniques in this application can be implemented by means of software plus the necessary general hardware platform. Based on such understanding, the technical solutions in the present application may be embodied in the form of software products in essence or in the form of software products, which may be stored in a storage medium such as ROM/RAM, magnetic Discs, optical discs, etc., include instructions for causing a computer device (which may be a personal computer, server, or VPN gateway, etc.) to perform the methods described in various embodiments of the present application or portions of the embodiments.

The same and similar parts between the various embodiments in this specification can be referred to each other. In particular, for the method embodiment, since it is basically similar to the device embodiment, the description is relatively simple, and the relevant points can be referred to the description in the device embodiment.

The embodiments of the present application described above are not intended to limit the scope of the present application.

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the present application without departing from the spirit and scope of the application. Thus, it is intended that the present invention cover the modifications and variations of the embodiments of the present invention.

Claims

A correction method, characterized in that the method comprises:

Performing a first conversion process on each of the N-channel pre-transmitted beam stream-level digital signals to obtain a M-channel pre-transmitted antenna stream-level digital signal, wherein both M and N are integers greater than 1, and M is greater than N;

Performing 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;

Performing a third conversion process on each of the actual channel-level analog signals of the M-channel to obtain an actual antenna-level digital signal of the M-path;

Performing a fourth conversion process on the actual antenna stream level digital signal of the M path to obtain N actual beam current level digital signals;

Modeling the N-way pre-transmitted beam stream level digital signal and the N-way actual beam stream-level digital signal to obtain a pre-distortion coefficient corresponding to each of the N-way pre-transmitted beam stream level digital signals, 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-level digital signal; using the N-way pre-transmitted beam current level digital signal Each corresponding pre-distortion coefficient corrects each of the N pre-transmitted beam current-level digital signals to obtain N-corrected beam-level digital signals.
The correction method according to claim 1, wherein the modeling process is a nonlinear modeling process performed on a time domain and a spatial domain.
The correction method according to claim 1 or 2, wherein said second conversion processing includes up-conversion processing, digital-to-analog conversion processing, and amplification processing.
The correction method according to any one of claims 1 to 3, characterized in that said third conversion processing includes analog-to-digital conversion processing and down-conversion processing.
The correction method according to claim 4, wherein said third conversion processing is performed using an uplink.
The correction method according to any one of claims 1 to 5, characterized in that said third conversion processing further comprises selection processing for acquiring said actual channel level analog signal of partial energy.
A calibration apparatus, comprising: 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 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, where both M and N are integers greater than one. 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 perform modeling processing on the N pre-transmitted beam stream level digital signal and the N-channel actual beam stream level digital signal to obtain the N-channel pre-transmitted beam stream level digital signal Corresponding pre-distortion coefficients for each channel, 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-level digital signal;

The correction circuit is configured to correct each path of the N pre-transmitted beam current level digital signals by using a pre-distortion coefficient corresponding to each of the N-way pre-transmitted beam stream level digital signals, and obtain N-channel correction The beam current level digital signal.
The correction apparatus according to claim 7, wherein said modeling process of said modeling circuit is a nonlinear modeling process performed on a time domain and a spatial domain.
The correction device according to claim 7 or 8, wherein said second conversion circuit comprises an up-conversion circuit, a digital-to-analog conversion circuit, and a power amplifying circuit.
A calibration apparatus according to any one of claims 7 to 9, wherein said third conversion circuit comprises an analog to digital conversion circuit and a down conversion circuit.
The correction device according to claim 10, wherein said third conversion circuit belongs to an uplink.
A calibration apparatus according to any one of claims 7 to 11, wherein said third conversion circuit further comprises a selection circuit for obtaining said actual channel level analog signal of a portion of the energy.
A calibration device characterized by being a radio frequency unit.
A correction device characterized by being a baseband unit.
A correction device characterized by being an access network device.
A computer storage medium for storing a program, the program being invoked by a processor for performing the correction method according to any one of claims 1 to 7.