CN114567388A

CN114567388A - Amplitude and phase calibration method and device, medium and equipment

Info

Publication number: CN114567388A
Application number: CN202011363908.0A
Authority: CN
Inventors: 赵远志; 吴广德; 周瑞兴; 赵青; 韦兆碧
Original assignee: Nanjing ZTE New Software Co Ltd
Current assignee: Nanjing ZTE New Software Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2022-05-31

Abstract

The present disclosure provides an amplitude and phase calibration method for an active antenna unit AAU internal coupling network, including: determining an inner coupling network correction parameter of each channel of an inner coupling network of the AAU; and respectively carrying out amplitude and phase calibration on the signals of each channel of the in-coupling network by using the in-coupling network correction parameters of each channel. The step of determining the correction parameters of the in-coupling network of each channel of the in-coupling network comprises the following steps: acquiring a first AC sequence output by an inner coupling junction; determining an in-coupling AC weight according to the first AC sequence; acquiring a second AC sequence output by the external coupling junction; determining an out-coupling AC weight according to the second AC sequence; and determining an inner coupling network correction parameter of each channel of the inner coupling network according to the inner coupling AC weight and the outer coupling AC weight. The present disclosure also provides a magnitude-phase calibration apparatus, and a computer-readable storage medium and an electronic device. The amplitude and phase calibration method has high precision.

Description

Amplitude and phase calibration method and device, medium and equipment

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a method for calibrating an amplitude phase of an Active Antenna Unit (AAU) inner coupling network, an amplitude phase calibration apparatus for an AAU inner coupling network, a computer-readable storage medium, and an electronic device.

Background

At present, the AAU generally adopts a coupling network downward-shifting architecture, that is, the antenna calibration coupling network is moved downward from the antenna to the TRX board, and as shown in fig. 1, the coupling node is moved downward behind the power amplifier. Because the filter behind the coupling node is not included in the antenna correction loop and the channels of the internal coupling network have differences, after the antenna is corrected, the amplitude-phase consistency of the input ports of the antenna can be realized only after the amplitude-phase difference compensation of the filters of the channels and the internal coupling network is carried out.

The currently adopted amplitude and phase calibration method is realized by using a vector network analyzer through single tone frequency sweep. As shown in fig. 2, the AAU to be tested and the vector network analyzer perform clock synchronization, and during calibration, the AAU autonomously performs single tone comparison between the amplitudes and phase differences of the two ports through the receiver function of the vector network analyzer. However, after calibration by this calibration method, the antenna performance is still not ideal.

Therefore, how to improve the antenna performance is a technical problem to be solved in the field.

Disclosure of Invention

The present disclosure provides a magnitude and phase calibration method of an AAU in-coupling network, a magnitude and phase calibration apparatus for an AAU in-coupling network, a computer-readable storage medium, and an electronic device.

As a first aspect of the present disclosure, there is provided a method for calibrating amplitude and phase of an AAU in-coupling network, including:

determining an in-coupling network modification parameter for each channel of the AAU in-coupling network, comprising:

acquiring a first AC sequence output by an inner coupling junction;

determining an in-coupling AC weight according to the first AC sequence;

acquiring a second AC sequence output by the external coupling junction;

determining an out-coupling AC weight according to the second AC sequence;

determining an inner coupling network correction parameter of each channel of the inner coupling network according to the inner coupling AC weight and the outer coupling AC weight;

and respectively carrying out amplitude and phase calibration on the signals of each channel of the in-coupling network by using the in-coupling network correction parameters of each channel.

Optionally, in the step of determining an in-coupling network correction parameter of each channel of the AAU according to the in-coupling AC weight and the out-coupling AC weight, the in-coupling network correction parameter of each channel of the in-coupling network is calculated by the following formula:

wherein w_{coup_0}Modifying the parameters for the in-coupling network of the reference channel;

w_{coup_i}correcting parameters of an in-coupling network of a channel with the number i, wherein i is selected from 1 to N, i is a positive integer, and N +1 is the total number of the channels of the AAU;

w_{in_0}an in-coupling AC weight of a reference channel of the AAU;

w_{in_i}the number of the channel is I, and the number of the channel is AAU;

w_{ext_0}being AAUAn out-coupling AC weight of the reference channel;

w_{ext_i}the number of the channel is i, and the channel is an external coupling AC weight of the AAU;

C₀inputting a transmission coefficient to an external coupling junction for a reference channel of a calibration tool plate of an external coupling network;

ci is a transmission coefficient of a channel with the serial number i of a calibration tool plate for setting the outcoupling network;

A_{in_0}the AC parameter of the reference channel of the AAU is acquired by the in-coupling junction;

A_{in_i}the AC parameter of the channel with the serial number i of the AAU acquired by the in-coupling junction is obtained;

A_{ext_0}the AC parameter of the reference channel of the AAU is acquired at the out-coupling junction;

A_{ext_i}and obtaining the AC parameter of the channel with the number i of the AAU at the external coupling junction.

Optionally, the transmission coefficients of the channels of the calibration tooling plate of the outcoupling network are determined using a vector network analyzer.

As a second aspect of the present disclosure, there is provided an amplitude and phase calibration apparatus for an in-coupling network of an AAU, including:

an external coupling network module, including an external coupling network and an external coupling combiner, where multiple input ports of the external coupling network are used for one-to-one connection with multiple antenna ports of the AAU;

an input end of the internal and external coupling switching module is used for being electrically connected with a calibration channel of the AAU, a first output end of the internal and external coupling switching module is electrically connected with an internal coupling junction of an internal coupling combiner of an internal coupling network of the AAU, a second output end of the internal and external coupling switching module is electrically connected with an external coupling junction of an external coupling combiner of the external coupling network module, and the internal and external coupling switching module can selectively conduct the input end of the internal and external coupling switching module with the first output end and the second output end.

Optionally, the internal and external coupling switching module is a single-pole double-throw radio frequency switch.

Optionally, the out-coupling network module is disposed on a calibration tooling plate.

Optionally, the amplitude and phase calibration apparatus further includes a vector network analyzer for determining transmission coefficients of the channels of the calibration tooling plate.

As a third aspect of the present disclosure, there is provided a computer-readable storage medium having stored thereon an executable program capable of implementing the amplitude-phase calibration method when the executable program is executed.

As a fourth aspect of the present disclosure, there is provided an electronic apparatus comprising:

a storage module having an executable program stored thereon;

one or more processors to execute the executable program such that the one or more processors implement the amplitude-phase calibration method.

Optionally, the electronic device further comprises a magnitude and phase calibration apparatus provided in the second aspect of the present disclosure.

For the AAU, when it is used formally, it is necessary to perform uplink correction and downlink correction for each channel of the AAU. And during the uplink correction and the downlink correction, generating an initial AC sequence by using a digital baseband processing unit of the AAU, wherein the initial AC sequence comprises a plurality of initial AC parameters, and the number of the initial AC parameters is the same as the number of channels of the AAU.

When calibrating each transmitting channel of the AAU, the influence of the in-coupling network on the amplitude-phase parameter of the transmitting channel and the influence of the out-coupling network on the amplitude-phase parameter of the transmitting channel need to be considered. In the present disclosure, the out-coupling network is not enabled when the first AC sequence is acquired, and thus, the first AC sequence may reflect the effect of the in-coupling network on the initial AC parameters. Likewise, the second AC sequence is obtained without the in-coupling network enabled, and thus, the second AC sequence may reflect the effect of the out-coupling network on the initial AC parameters.

When the amplitude and phase calibration is carried out on the internal coupling network of the AAU, the correction parameters of the internal coupling network can be obtained only by considering the influence of the internal coupling network on a transmitting channel. Therefore, in the present application, the in-coupling network correction parameter can be determined by the in-coupling AC weight and the out-coupling AC weight.

In the method, the time spent in transmitting the initial AC sequence until the in-coupling AC weight and the out-coupling AC weight are obtained is short, so that the amplitude and phase calibration method is high in efficiency. The short time consumption means that the temperature variation error (namely, the temperature variation error) is small, so that the amplitude and phase calibration method also has higher precision.

Drawings

Fig. 1 is a schematic diagram of an architecture of an AAU antenna system;

FIG. 2 is a diagram illustrating a related art architecture for performing amplitude and phase calibration of an in-coupling network;

fig. 3 is a flow chart of a method of amplitude and phase calibration of an AAU in-coupling network provided by the present disclosure;

FIG. 4 is a flowchart of the steps of determining the in-coupling network correction parameters of each channel in the amplitude and phase calibration method provided by the present disclosure;

FIG. 5 is a schematic diagram of a magnitude and phase calibration apparatus provided by the present disclosure in an in-coupling mode;

fig. 6 is a schematic diagram of a magnitude and phase calibration apparatus provided by the present disclosure in an out-coupling mode.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the method for calibrating the amplitude-phase difference of the internal coupling network by using the single-tone frequency sweeping method in the related technology, the amplitude and the phase difference of two ports are compared through the receiver function of a vector network analyzer, and all frequency points in all channels and the working bandwidth range are traversed and tested. The method can only test the frequency points one by channels, and the more the channels are, the smaller the frequency point stepping is, the longer the calibration time is, the lower the test efficiency is, and the longer the time is.

Just because the test takes a long time, the temperature of the whole machine is increased in the test process, and the phase is sensitive to the temperature, so that the calibration method inevitably introduces phase temperature change errors, thereby reducing the test precision and finally influencing the system performance.

In view of the above, as one aspect of the present disclosure, there is provided a method for calibrating amplitude and phase of an in-coupling network of an active antenna unit AAU, as shown in fig. 3, the method for calibrating amplitude and phase includes:

in step S110, determining an incoupling network correction parameter of each channel of the incoupling network of the AAU; and

in step S120, amplitude and phase calibration is performed on the signals of each channel of the in-coupling network respectively by using the in-coupling network correction parameter of each channel.

As shown in fig. 4, the step of determining the incoupling network correction parameter of each channel of the incoupling network of the AAU specifically includes:

in step S111, controlling the calibration channel to be conducted with the in-coupling network;

in step S112, the digital baseband processing unit is controlled to issue an initial Antenna Calibration (AC) sequence;

in step S113, a first AC sequence output by the incoupling junction is acquired;

in step S114, determining an incoupling AC weight according to the first AC sequence;

in step S115, controlling the calibration channel to be conducted with an out-coupling network;

in step S116, a second AC sequence output by the out-coupling combiner port is obtained;

in step S117, determining an out-coupling AC weight according to the second AC sequence;

in step S118, an in-coupling network modification parameter of each channel of the in-coupling network is determined according to the in-coupling AC weight and the out-coupling AC weight parameter.

In the present disclosure, the in-coupling network correction parameter may characterize the in-coupling network difference, and the amplitude-phase difference caused by the cavity filter (the cavity filter 300 is shown in fig. 5 and 6) and the trace between the coupling end of each channel and the antenna interface.

For the AAU, upstream correction and downstream correction are required for each channel of the AAU. In the uplink correction and the downlink correction, an initial AC sequence is generated by a digital baseband processing unit (the digital baseband processing unit 110 is shown in fig. 5 and fig. 6) of the AAU, wherein the initial AC sequence includes a plurality of initial AC parameters, and the number of the initial AC parameters is the same as the number of channels of the AAU.

It is noted that the digital baseband processing unit is still continuously issuing the initial AC sequence while step S115 is being executed.

In calibrating each transmit channel of the AAU (in the embodiments shown in fig. 5 and 6, the AAU includes N +1 transmit channels, i.e., the transmit channel TX-0 to the transmit channel TX-N, and of course, the AAU may include components such as the power amplifier 120 besides the transmit channel), the influence of the in-coupling network (which includes a plurality of in-coupling network couplers 130) on the amplitude and phase parameters of the transmit channel and the influence of the out-coupling network on the amplitude and phase parameters of the transmit channel need to be considered. In the present disclosure, the out-coupling network is not enabled when the first AC sequence is acquired, and thus, the first AC sequence may reflect the effect of the in-coupling network on the initial AC parameters. Likewise, the in-coupling network is not enabled when the second AC sequence is acquired, and thus, the second AC sequence may reflect the effect of the out-coupling network on the initial AC parameters.

When the amplitude and phase calibration is carried out on the internal coupling network of the AAU, the correction parameters of the internal coupling network can be obtained only by considering the influence of the internal coupling network on a transmitting channel. Therefore, in the present application, the relative amplitude-phase difference between the inner coupling port and the outer coupling port can be determined by the inner coupling AC weight and the outer coupling AC weight, so that the correction parameter of the inner coupling network can be determined.

It should be noted that the in-coupling network modification parameter is not a parameter, but a parameter set including a plurality of in-coupling network parameters, and a plurality of the in-coupling network parameters in one parameter set are in one-to-one correspondence with a plurality of channels of the AAU.

After the correction parameters of the internal coupling network are obtained, the correction parameters of the internal coupling network are used for correcting each channel of the internal coupling network, so that the influence of the difference of each channel of the internal coupling network on the signals of each channel of the AAU can be eliminated.

In the method, the time spent in transmitting the initial AC sequence until the in-coupling AC weight and the out-coupling AC weight are obtained is short, so that the amplitude and phase calibration method is high in efficiency. The short time consumption means that the temperature rise error is small, so the amplitude and phase calibration method also has higher precision.

In addition, compared with the related art, in the amplitude and phase calibration method provided by the disclosure, dependence on the vector network analyzer is eliminated, and reduction of calibration precision caused by self errors of the vector network analyzer is avoided, so that the calibration precision is improved.

In the present disclosure, how to determine the in-coupling network modification parameters in step S118 without any special influence, the in-coupling network modification parameters of each channel of the AAU are optionally calculated by the following formulas (1) to (3):

wherein, w_{coup_0}Correcting parameters for an in-coupling network of a reference channel above the AAU;

w_{in_0}an in-coupling AC weight of a reference channel of the AAU;

w_{in_i}the number of the channel is I, and the number of the channel is AAU;

w_{ext_0}an outcoupling AC weight of a reference channel that is an AAU;

C₀inputting the transmission coefficient of a reference channel of a calibration tool plate of an external coupling network into the reference channel of the external coupling junction;

C_iinputting a transmission coefficient to an external coupling junction for a channel with the serial number i of a calibration tool plate of the external coupling network;

A_{ext_i}and the AC parameter of the channel with the number i of the AAU acquired at the external coupling junction is acquired.

In the present disclosure, in order to determine the in-coupling network correction parameters, an out-coupling network is provided on the calibration tool board. In addition, in the formula (1), the influence of the transmission coefficient of each channel on the calibration tooling board is also considered, so that the in-coupling network correction parameters determined by the method provided by the disclosure can be more accurate.

The derivation process of the above formula (1) is described below.

In the present disclosure, equation (3) can be modified as follows, resulting in equation (4):

and (3) disassembling the transmission coefficient of each channel of the calibration tooling plate to obtain the following formula (5):

wherein w in the formula (5)_{ext_0}' and w_{ext_i}' calibrating the weight of the antenna port corresponding to the reference channel of the AAU for the out-coupling network and calibrating the weight of the antenna port numbered i for the out-coupling network.

After obtaining the weights calibrated to each antenna port by the out-coupling network, the above equation (1) can be obtained through the following derivation process, and the weights calibrated to each antenna port by the in-coupling network (i.e., the in-coupling network correction parameters) can be determined:

after obtaining the correction parameters of each in-coupling network, storing the correction parameters of each in-coupling network in a file system of the AAU complete machine in a file form, and subsequently performing amplitude-phase calibration on the in-coupling network of the AAU by using the correction parameters of the in-coupling network.

In the present disclosure, how to determine the transmission coefficient of each channel of the calibration jig is not particularly limited, and for example, the transmission coefficient of each channel of the calibration jig may be determined by using a vector network analyzer.

It should be noted that the vector network analyzer is only used for calibrating the external coupling tooling plate, and only needs to be calibrated once, and after the external transmission coefficient of the tooling plate is calibrated, the vector network analyzer can be used in a calibration method of a plurality of different antennas. Therefore, the vector network analyzer used in the step does not influence the calibration result.

The amplitude and phase calibration method provided by the present disclosure is described in detail below with reference to fig. 5 and 6.

As shown in fig. 5 and 6, in the present disclosure, an outcoupling network is provided on the calibration jig board 200, and as shown in the drawings, the outcoupling network includes a plurality of outcoupling channels connected in one-to-one correspondence with a plurality of antenna ports (the antenna port Ant _0 and the antenna port Ant _ N are shown in the drawings). Each of the outcoupling channels includes a coupler 210 and a load 220, an input terminal of the coupler 210 is electrically connected to a corresponding antenna port, a load terminal of the coupler 210 is electrically connected to the load 220, and an output terminal of the coupler 210 is electrically connected to an input terminal of the outcoupling combiner 230.

An external calibration radio frequency interface B connected to the external coupling combiner 230 is disposed on the TRX board 100 of the AAU. It should be noted that the external orthogonal rf interface B is a physical interface.

In addition, the TRX board 100 of the AAU is further provided with an internal and external coupling switching module 170, and the internal and external coupling switching module 170 may selectively communicate the input end of the power divider on the TRX board with the external calibration radio frequency interface B and electrically connect with the internal coupling junction of the internal coupling junction 230, so as to realize switching between the internal coupling mode and the external coupling mode of the AAU.

Fig. 5 shows an inner coupling mode, in which the combining port of the power divider 150 is electrically connected to the inner coupling combining port of the inner coupling combiner 160, one path of the power dividing port of the power divider is connected to the point detection port C, and the other path of the power dividing port of the power divider 150 is connected to the calibration channel 140. After the initial AC sequence is sent out by the digital baseband processing unit, the first AC sequence may be obtained at the point inspection port C of the power divider 150.

Shown in fig. 6 is an out-coupling mode, in which the input terminal of the power divider 150 is electrically connected to the out-coupling combining port of the out-coupling combiner 230. After the initial AC sequence is sent out by the digital baseband processing unit, the second AC sequence may be obtained at the point inspection port C of the power divider 150.

As an embodiment of the present disclosure, the internal and external coupling switching module 170 may be an alternative single-pole double-throw radio frequency switch, and the combining port of the power divider 150 is connected to the radio frequency common terminal of the single-pole double-throw radio frequency switch used as the internal and external coupling switching module 170.

The following describes the procedure of the amplitude and phase calibration method with an in-coupling network comprising two channels:

the correction channel is conducted with the internal coupling network, the AAU is used as the downlink AC, and the internal coupling weight is calculated and recorded as w_{in_0}And w_{in_1}Then, then

Calculating an AC weight of an outcoupling mode;

the correction channel is conducted with the internal coupling network, the AAU is used as a downlink AC, and the calculation of the external coupling weight with the calibration tool is recorded as w_ext_{_0}And w_{ext_1}Then, then

Disassembling transmission factors of the calibration tool, and respectively recording weights calibrated to the antenna ports as w_{ext_0}' and w_{ext_1}', then

Calculating correction parameters of the internal coupling network, including difference of the internal coupling network, and amplitude-phase difference caused by cavity filter and wiring between coupling end of each channel and antenna interface, and respectively recording as w_{coup_0}And w_{coup_1}Then, then

Will w_coupAnd storing the data in a file form into a whole file system, and completing the test of the amplitude and phase parameters of the coupling network.

The amplitude and phase calibration method provided by the disclosure can be used for rapidly and accurately determining the in-coupling correction parameters of each channel of the in-coupling network, and can also be used for rapidly carrying out amplitude and phase calibration on the signals of each channel of the in-coupling network.

The following takes the dual-channel AAU as an example to demonstrate that the amplitude phase of each channel of the antenna port can be consistent after the AAU complete machine is normally AC and the coupling network factor calibrated by the method of the present invention is compensated.

Firstly, downlink correction is carried out to obtain a downlink correction weight;

multiplying the coupling network factor to obtain the final downlink correction weight value which is respectively recorded as w_{ac_0}And w_{ac_1}Then, then

When the digital baseband processing unit transmits the same-amplitude and same-phase data, the data is equivalently transmitted as 1,0 data for simplifying calculation, and a complex variable A can be used at each channel antenna port_{ant_0}、A_{ant_1}If the transmission factor is A, the complex transmission factor of each channel from the base band to the antenna port of the downlink is_{ant_0}、A_{ant_1}After the baseband data is multiplied by the final AC weight, the expression of each antenna port is as follows:

it can be seen that after descending AC, each channel descending to the antenna port is aligned to A_{ant_0}. Thus, the device and the method can achieve the aim of calibrating the in-coupling network.

As a second aspect of the present disclosure, a magnitude-phase calibration apparatus for an in-coupling network of an AAU is provided, which includes an out-coupling network module and an in-out-coupling switching module 170, as shown in fig. 5 and 6.

The out-coupling network module includes an out-coupling network and an out-coupling combiner 230, and a plurality of input ports of the out-coupling network are used for one-to-one connection with a plurality of antenna ports of the AAU.

The input end of the internal and external coupling switching module 170 is configured to be electrically connected to the calibration channel 140 of the AAU, the first output end of the internal and external coupling switching module 170 is electrically connected to the internal coupling junction of the internal coupling combiner 160 of the internal coupling network of the AAU, the second output end of the internal and external coupling switching module 170 is electrically connected to the external coupling junction of the external coupling combiner 230 of the external coupling network module, and the internal and external coupling switching module 170 is capable of selectively connecting the input end of the internal and external coupling switching module 170 to the first output end and the second output end.

It should be noted that, when the input end of the internal-external coupling switching module 170 is electrically connected to the first output end, the calibration channel 140 is electrically connected to the internal coupling port of the internal coupling combiner 160; when the input end of the internal and external coupling switching module 170 is electrically connected to the second output end, the calibration channel 140 is electrically connected to the external coupling port of the external coupling combiner 230.

As an alternative embodiment, the internal-external coupling switching module 170 is electrically connected to the calibration channel 140 through the power divider 150.

As an alternative embodiment, the internal and external coupling switching module 170 is a single-pole double-throw rf switch.

For ease of installation, the out-coupling network module is optionally located on the calibration tooling board 200.

To facilitate measuring the transmission coefficients of the channels of the calibration tooling plate 200, optionally, the amplitude and phase calibration system further comprises a vector network analyzer for determining the transmission coefficients of the channels of the calibration tooling plate 200.

In the present disclosure, the outcoupling network module may include a plurality of outcoupling channels, each of which includes a coupler 210 and a load 220, an input terminal of the coupler 210 being electrically connected to a corresponding antenna port, a load terminal of the coupler 210 being electrically connected to the load 220, and an output terminal of the coupler 210 being electrically connected to an input terminal of the outcoupling combiner 230.

As a third aspect of the present disclosure, a computer-readable storage medium is provided, which stores an executable program thereon, and when the executable program is executed, the above-mentioned amplitude and phase calibration method provided by the present disclosure can be implemented.

Examples

The amplitude and phase calibration method for the correction parameters of the in-coupling network provided by the present disclosure is described below by taking an AAU with 32 channels and an operating bandwidth of 100MHz as an example.

The first step is as follows: the transmission coefficients of all channels of the total external coupling path in the working bandwidth measured by a vector network analyzer in advance are respectively expressed as C₀，C₁……C_NThe frequency point interval is 1 MHz;

the second step is that: the device is used for environment construction, the carrier bandwidth of the AAU channel is configured to be 100MHz, the central frequency point is configured to be the central frequency point of a working frequency band, the whole machine is switched to an inner correction mode to carry out uplink antenna correction, the AC sequence bandwidth is consistent with the carrier bandwidth configuration and is 100MHz, amplitude and phase data in all channels within the 100MHz bandwidth can be obtained after the antenna correction, and the weight of each channel is respectively represented as W_{in_0}，W_{in_1}……W_{in_N}；

The third step: the carrier bandwidth and the central frequency point are not changed, the whole machine is switched to an external correction mode, uplink antenna correction is carried out again, and the weights generated by the antenna correction of each channel at the moment are obtained and are respectively represented as W_{ext_0}，W_{out_1}……W_{out_N}；

Setting the final incoupling static weights to be denoted as W_{CAL_0}，W_{CAL_1}……W_{CAL_N}；

Wherein N +1 is the number of channels of the whole machine, and when the number of channels of the whole machine is 32, N is 31;

then from the formula described above:

W_{CAL_0}＝1

……

then W is_{CAL_0}，W_{CAL_1}……W_{CAL_N}And converting the file into a file with a system specified format and writing the file into a whole file system.

According to the current functional performance state of the 32T type antenna, one-time antenna correction can be completed within 20s in actual measurement to obtain weight data of each channel, the 100MHz carrier bandwidth configuration is adopted, the 100MHz bandwidth amplitude-phase calibration can be completed through two-time antenna correction, the calibration granularity on the frequency domain is 1 RB-360 kHz (calculated according to NR standard 30kHz subcarrier), and the total time consumption is not more than 1 minute when related processes are considered. Compared to the single tone frequency sweep method, the 4MHz step sweep took more than 30 minutes in total.

Because the calibration time is short, the calibration of all channels is completed once, the amplitude and the phase are not easily influenced by the temperature, and if the uplink antenna calibration is adopted to calibrate all receiving channels of the channels to receive simultaneously, the time-varying characteristic does not exist, and the multi-time calibration stability of the actual measurement is higher.

The amplitude and phase precision, particularly the phase precision, calibrated by the device and the method is mainly determined by AC precision and stability, in the embodiment, uplink AC is adopted, the precision can reach within +/-2.5 degrees, the stability can reach within +/-1 degrees, and although the testing precision of the single-tone frequency sweep instrument is higher than that of the AC precision, the testing time is longer, and temperature-variable phase errors exist, so the overall testing precision of the device and the method is obviously superior to that of the single-tone frequency sweep.

It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can be accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as is well known to those skilled in the art.

a storage module having an executable program stored thereon;

one or more processors to execute the executable program such that the one or more processors implement the above-described amplitude and phase calibration method provided by the present disclosure.

A processor is a device with data processing capabilities, including but not limited to a Central Processing Unit (CPU), etc.; memory modules are devices with data storage capabilities including, but not limited to, random access memory (RAM, more specifically SDRAM, DDR, etc.), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), FLASH memory (FLASH).

The I/O interface is connected between the processor and the memory module, and can implement information interaction between the processor and the memory module, which includes but is not limited to a data Bus (Bus) and the like.

In some embodiments, the processor, the memory module, and the I/O interface are connected to each other via a bus, which in turn connects to other components of the display terminal.

Optionally, the electronic device is an amplitude and phase calibration system of an internal coupling network of an AAU, and accordingly, the electronic device may further include an amplitude and phase calibration apparatus provided by the second method of the present disclosure.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. A method for calibrating the amplitude and phase of an Active Antenna Unit (AAU) internal coupling network comprises the following steps:

determining an incoupling network correction parameter for each channel of an incoupling network of an AAU, comprising:

acquiring a first AC sequence output by an inner coupling junction;

determining an in-coupling AC weight according to the first AC sequence;

acquiring a second AC sequence output by the external coupling junction;

determining an out-coupling AC weight according to the second AC sequence;

2. The amplitude-phase calibration method according to claim 1, wherein in the step of determining the in-coupling network correction parameters according to the in-coupling AC weights and the out-coupling AC weights, the in-coupling network correction parameters of each channel of the in-coupling network are calculated by the following formula:

wherein, w_{coup_0}Correcting parameters for an in-coupling network of a reference channel of the AAU;

w_{in_0}an in-coupling AC weight value of a reference channel of the AAU;

w_{in_i}the number of the channel is i of the AAU is the inner coupling AC weight;

w_{ext_0}an outcoupling AC weight of a reference channel of the AAU;

w_{ext_i}the outcoupling AC weight value of the channel with the serial number of i of the AAU is obtained;

C₀inputting a transmission coefficient to an external coupling junction for setting a reference channel of a calibration tool plate of the external coupling network;

C_iinputting a transmission coefficient to an external coupling junction for a channel with the serial number i of a calibration tool plate of an external coupling network;

A_{in_i}the AC parameter of the channel with the serial number i of the AAU acquired at the inner coupling junction is acquired;

3. The amplitude and phase calibration method according to claim 2, wherein the transmission coefficient of each channel of the calibration tooling plate of the out-coupling network is determined using a vector network analyzer.

4. An amplitude and phase calibration apparatus for an in-coupling network of an AAU, comprising:

5. The amplitude and phase calibration device of claim 4, wherein the in-out coupling switching module is a single pole double throw radio frequency switch.

6. The amplitude and phase calibration device of claim 4, wherein the out-coupling network module is disposed on a calibration tooling plate.

7. The magnitude and phase calibration device according to claim 6, wherein the magnitude and phase calibration device further comprises a vector network analyzer for determining transmission coefficients of channels on the calibration tooling plate.

8. A computer-readable storage medium having stored thereon an executable program which, when executed, is capable of implementing the amplitude-phase calibration method of any one of claims 1 to 3.

9. An electronic device, comprising:

a storage module having an executable program stored thereon;

one or more processors to execute the executable program such that the one or more processors implement the magnitude-phase calibration method of any one of claims 1 to 3.

10. The electronic device of claim 9, wherein the electronic device further comprises the magnitude and phase calibration apparatus of any one of claims 4 to 7.