CN112968738B

CN112968738B - Channel calibration method and device thereof

Info

Publication number: CN112968738B
Application number: CN201911185718.1A
Authority: CN
Inventors: 章勇; 石璟
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2022-04-01
Anticipated expiration: 2039-11-27
Also published as: CN112968738A

Abstract

The application discloses a channel calibration method and a device thereof. The method and the device adopt the step calibration, firstly carry out the calibration of the intermediate frequency analog channel, and then carry out the calibration of the high frequency analog channel. The process of calibrating the intermediate frequency analog channel comprises the following steps: selecting an intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel to obtain an intermediate frequency analog channel group taking the calibration reference channel as a calibration standard, wherein the intermediate frequency analog channel group comprises the calibration reference channel and at least one intermediate frequency analog channel to be calibrated; and sending time domain calibration signals by grouping the intermediate frequency analog channels, performing frequency domain conversion on the time domain calibration signals received by the calibration port, and performing phase and amplitude compensation on the intermediate frequency analog channels to be calibrated in the grouping by taking the calibration reference channel as a calibration standard according to a frequency domain sequence obtained by conversion. The high-frequency analog channel calibration process comprises the following steps: and receiving calibration information of the high-frequency analog channel, and calibrating the high-frequency analog channel according to the calibration information.

Description

Channel calibration method and device thereof

Technical Field

The present disclosure relates to the field of wireless communications technologies, and in particular, to a channel calibration method and a device thereof.

Background

For a 5G NR millimeter wave system (FR2, above 26 GHz), the high-frequency analog channel can be subjected to analog beamforming by setting an analog beamforming factor. If amplitude difference or phase difference exists between the analog channels, the analog shaping effect may be seriously reduced. Therefore, calibration of the high frequency analog channels is needed to reduce the error between the analog channels, thereby improving the effect of analog beamforming.

FIG. 1a illustrates a simplified schematic of a millimeter wave analog channel. As shown in the figure, the analog channel of the millimeter wave is divided into an intermediate frequency analog channel and a high frequency analog channel. The carrier frequency of the intermediate frequency analog channel is near 3.xGHz, the intermediate frequency analog channels correspond to the digital channels one by one, and the total number of the intermediate frequency analog channels is P; the Q high-frequency analog channels correspond to one intermediate-frequency analog channel, the carrier frequency of the intermediate-frequency analog channel is near 26.yGHz, and the Q high-frequency analog channels are totally P.

Fig. 1b schematically shows a millimeter wave high frequency analog channel. As shown, the total number of the high-frequency analog channels is M ═ P × Q, each Q high-frequency analog channels corresponds to one digital channel, and P ═ M/Q digital channels. As shown in fig. 1, M is 64, P is 16, Q is 4, each high frequency analog channel may individually control its switch, one digital channel corresponds to Q4 high frequency analog channels, and one high frequency analog channel may be identified by (P, Q), where P is 0 to P-1, corresponding to the digital channel, and Q is 0 to Q-1, corresponding to the high frequency analog channel within the digital channel.

At present, a time domain calibration scheme is adopted for the high-frequency analog channel calibration of a 5G NR millimeter wave system. Fig. 2 schematically illustrates a flow chart of calibration for a high-frequency analog channel by using a time domain calibration method, and as shown in the figure, the flow chart may include:

in 201 to 203: constructing a calibration weight vector matrix W and storing the calibration weight vector matrix W in a beam forming device; constructing a transmit calibration signal; and each digital channel of the equipment to be calibrated transmits a corresponding calibration signal.

In 204 to 209, for each analog channel: each subarray of the analog channel switches the calibration weight vector to w_nCalibration port receive signal x_nConstructing a received data vector y_n。

At 210, a received data vector y is generated for each analog channel_nConstructing a received data matrix Y_TX。

In 211 to 214, according to the received data matrix Y_TXAnd executing calibration, specifically comprising: calculating a transmit channel error matrix E_TXCompensating the error to each analog channel to finish the initial amplitude-phase error calibration corresponding to the central frequency point; each emission channel is at 0 degreeTransmitting calibration signal in nominal beam direction, receiving signal x for calibration port₀And carrying out Fourier transform and channel mapping, estimating the amplitude-phase error of the frequency domain of each digital channel, and compensating to each digital channel.

The above time domain calibration scheme has the following problems:

(1) the phase difference between the calibrations is not taken into account: in the calibration process, the calibration weight vector is switched every time, and is calibrated at different times, and the phase noise influences the phase of the transmitted signal. The time domain calibration scheme does not consider the phase change of calibration at different times, so that the calibration at different times has larger phase errors and the calibration result is influenced;

(2) the delay differences between the different analog channels are not taken into account: the time delay between different analog channels has a certain error, the time domain calibration scheme receives the data in a unified manner in the time domain and processes the data in the time domain, and the time delays of different analog channels are not treated in a distinguishing manner, so that the estimation errors of different analog channels are different, and the calibration is possibly abnormal.

Disclosure of Invention

The embodiment of the application provides a channel calibration method and a device thereof, which are used for respectively calibrating a medium-frequency analog channel and a high-frequency analog channel so as to improve the calibration precision.

In a first aspect, a channel calibration method is provided, including:

selecting an intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel to obtain an intermediate frequency analog channel group using the calibration reference channel as a calibration standard, wherein the intermediate frequency analog channel group comprises the calibration reference channel and at least one intermediate frequency analog channel to be calibrated; sending time domain calibration signals through the intermediate frequency analog channel groups, carrying out frequency domain conversion on the time domain calibration signals received by a calibration port, and carrying out phase and amplitude compensation on the intermediate frequency analog channels to be calibrated in the groups by taking the calibration reference channel as a calibration standard according to a frequency domain sequence obtained by conversion;

and sending a calibration sequence of the high-frequency analog channel, receiving high-frequency analog channel calibration information which is obtained and sent by the test equipment according to the measurement of the calibration sequence, and calibrating the high-frequency analog channel according to the high-frequency analog channel calibration information.

Optionally, selecting one intermediate frequency analog channel from the intermediate frequency analog channels to be calibrated as a calibration reference channel, including: and selecting one intermediate frequency analog channel from the intermediate frequency analog channels to be calibrated as a calibration reference channel according to the stability or the signal-to-noise ratio of the intermediate frequency analog channels to be calibrated.

Optionally, the sending a time-domain calibration signal through the intermediate-frequency analog channel packet includes:

mapping a calibration sequence on subcarriers in a Resource Block (RB) in a frequency domain, wherein the calibration sequence is not mapped on direct current subcarriers in a passband;

converting the calibration sequence after the frequency domain mapping into a time domain calibration signal;

and sending the time domain calibration signal through an intermediate frequency analog channel in the packet.

Optionally, according to the frequency domain sequence obtained by conversion, performing phase and amplitude compensation on the to-be-calibrated intermediate frequency analog channel in the packet by using the calibration reference channel as a calibration standard, including:

performing channel estimation according to the frequency domain sequence obtained by conversion to obtain a channel estimation result of each intermediate frequency analog channel in the packet;

according to the channel estimation result of each intermediate frequency analog channel in the packet, determining an amplitude calibration factor of each intermediate frequency channel to be calibrated in the packet by taking a calibration reference channel in the packet as a calibration standard;

according to the channel estimation result of each intermediate frequency analog channel in the packet, determining a phase calibration factor of each intermediate frequency channel to be calibrated in the packet by taking a calibration reference channel in the packet as a calibration standard;

determining a calibration coefficient of each intermediate frequency analog channel to be calibrated according to an amplitude calibration factor and a phase calibration factor of each intermediate frequency analog channel to be calibrated respectively;

and compensating the intermediate frequency analog channels to be calibrated in the groups according to the calibration coefficient of each intermediate frequency analog channel to be calibrated.

Optionally, determining, according to a channel estimation result of each intermediate frequency analog channel in the packet, an amplitude calibration factor of each intermediate frequency channel to be calibrated in the packet by using a calibration reference channel in the packet as a calibration standard, including:

determining the average power of each intermediate frequency analog channel in the packet according to the channel estimation result of each intermediate frequency analog channel in the packet;

determining the power difference between each intermediate frequency analog channel to be calibrated in the grouping and a calibration reference channel in the grouping according to the average power of each intermediate frequency analog channel in the grouping;

and determining the amplitude calibration factor of each intermediate frequency analog channel to be calibrated in the packet according to the power difference.

Optionally, determining an average power of each intermediate frequency analog channel in the packet according to a channel estimation result of each intermediate frequency analog channel in the packet includes:

respectively determining the average value of the power of all sliding window positions of each intermediate frequency analog channel in the full bandwidth range, wherein one sliding window comprises a plurality of Resource Blocks (RB);

respectively determining the slope of the power curve of each intermediate frequency analog channel at all sliding window positions according to the average value;

fitting to obtain a power curve according to the slope of the power curve;

and fitting the RB power according to the power curve to obtain the average power of each intermediate frequency analog channel in the group.

Optionally, determining a phase calibration factor of each intermediate frequency channel to be calibrated in the packet by using a calibration reference channel in the packet as a calibration standard according to a channel estimation result of each intermediate frequency analog channel in the packet, including:

extracting the phase of each intermediate frequency analog channel in the packet according to the channel estimation result of each intermediate frequency analog channel in the packet;

according to the phase of each intermediate frequency analog channel in the group, performing phase linear fitting on each intermediate frequency analog channel in a segmentation manner in a full bandwidth range to obtain the phase of the resource unit RE level;

determining an inter-group reference channel phase difference equal to a difference between a phase of the calibration reference channel at a bandwidth middle RE position after a phase linear fit in the first if analog channel group and a phase of the bandwidth middle RE position after a phase linear fit in the second if analog channel group;

for the intermediate frequency analog channels to be calibrated in the first intermediate frequency analog channel group, determining phase calibration factors of the intermediate frequency channels to be calibrated according to the phase of the RE level of the intermediate frequency analog channels to be calibrated and the phase difference of the component reference channels; and determining a phase calibration factor of the intermediate frequency channel to be calibrated according to the phase of the RE level of the intermediate frequency channel to be calibrated for the intermediate frequency analog channel to be calibrated in the second intermediate frequency analog channel group.

Optionally, the phase calibration factor is determined according to the following formula:

for the to-be-calibrated intermediate frequency analog channels in the first packet:

for analog channels to be calibrated in the other packets:

wherein the content of the first and second substances,

for the phase alignment factor of the intermediate frequency analog channels t in the intermediate frequency analog channel group g,

for the phase of RE level of the intermediate frequency analog channel t in the intermediate frequency analog channel group g,

is the inter-group reference channel phase difference; wherein g is the serial number of the intermediate frequency analog channel group, and t is the serial number of the intermediate frequency analog channel.

Optionally, selecting an intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel, and obtaining an intermediate frequency analog channel group using the calibration reference channel as a calibration reference, including:

selecting one intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel;

and taking the calibration reference channel as a calibration reference to obtain a first intermediate frequency analog channel group and a second intermediate frequency analog channel group, wherein the first intermediate frequency analog channel group and the second intermediate frequency analog channel group both comprise the calibration reference channel.

In a second aspect, there is provided a channel calibration device, comprising:

the device comprises a grouping module, a calibration module and a control module, wherein the grouping module is used for selecting an intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel to obtain an intermediate frequency analog channel group which takes the calibration reference channel as a calibration standard, and the intermediate frequency analog channel group comprises the calibration reference channel and at least one intermediate frequency analog channel to be calibrated; sending time domain calibration signals through the intermediate frequency analog channel groups, carrying out frequency domain conversion on the time domain calibration signals received by a calibration port, and carrying out phase and amplitude compensation on the intermediate frequency analog channels to be calibrated in the groups by taking the calibration reference channel as a calibration standard according to a frequency domain sequence obtained by conversion;

and the calibration module is used for sending a calibration sequence of the high-frequency analog channel, receiving the high-frequency analog channel calibration information which is obtained and sent by the test equipment according to the measurement of the calibration sequence, and calibrating the high-frequency analog channel according to the high-frequency analog channel calibration information.

In a third aspect, a communication apparatus is provided, including: a processor, memory, transceiver; the processor is configured to read computer instructions in the memory and execute the method according to any one of the above first aspects.

In a fourth aspect, there is provided a computer-readable storage medium having stored thereon computer-executable instructions for causing the computer to perform the method of any of the first aspects above.

In the above embodiment of the present application, the calibration in stages is adopted, that is, the intermediate frequency analog channel is calibrated first, and then the high frequency analog channel is calibrated, so that the antenna can be calibrated as a whole. When the intermediate frequency analog channel is calibrated, frequency domain calibration is adopted, and phase calibration is also carried out besides amplitude calibration, so that on one hand, the phase difference between each calibration can be eliminated, and on the other hand, because the time delay between different high frequency analog channels is expressed as the phase difference in the frequency domain, the phase difference can be eliminated through phase calibration.

Drawings

FIG. 1a illustrates a simplified schematic diagram of a millimeter wave analog channel;

FIG. 1b illustrates a millimeter wave high frequency analog channel schematic;

FIG. 2 illustrates a time domain calibration flow diagram;

FIG. 3 illustrates a schematic diagram of a hierarchical calibration provided by an embodiment of the present application;

fig. 4 illustrates an overall process of antenna calibration provided by the embodiment of the present application;

fig. 5 schematically illustrates a calibration procedure of an intermediate frequency analog channel provided in an embodiment of the present application;

fig. 6a and 6b are schematic diagrams respectively illustrating intermediate frequency analog channel grouping in an embodiment of the present application;

fig. 7 schematically shows a frequency domain calibration flow for each intermediate frequency analog channel packet in the embodiment of the present application;

fig. 8 is a schematic diagram illustrating a flow chart of transmitting a time-domain calibration signal through an intermediate-frequency analog channel in a packet in an embodiment of the present application;

FIG. 9a illustrates a diagram of RE locations within an RB to which calibration sequences may be mapped;

FIGS. 9b and 9C are diagrams illustrating mapping of a calibration sequence onto an RB, respectively;

fig. 10 is a schematic diagram illustrating a flow chart of performing phase and amplitude compensation on an intermediate frequency analog channel to be calibrated in a packet in the embodiment of the present application;

fig. 11 is a schematic diagram illustrating a flow chart of calculating an amplitude calibration factor of each intermediate frequency channel to be calibrated in a packet in the embodiment of the present application;

12a, 12b and 12c are diagrams illustrating channel estimation position and sliding window in the embodiment of the present application;

fig. 13 is a schematic diagram illustrating a flow chart of calculating a phase calibration factor of each intermediate frequency channel to be calibrated in a packet in the embodiment of the present application;

fig. 14 schematically illustrates a calibration flow of a high-frequency analog channel provided by an embodiment of the present application;

FIG. 15a is a schematic diagram illustrating two calibration reference channels selected in an embodiment of the present application;

fig. 15b to 15i each schematically show a high frequency analog channel grouping;

FIG. 16 is a schematic diagram illustrating a frequency domain calibration flow for each high frequency analog channel packet in the embodiment of the present application;

FIG. 17 is a schematic diagram illustrating a flow chart of transmitting a time-domain calibration signal through a high-frequency analog channel in a packet in an embodiment of the present application;

FIG. 18a illustrates a diagram of RE locations within an RB to which calibration sequences may be mapped;

FIGS. 18b and 18c respectively illustrate a mapping of a calibration sequence onto an RB;

FIG. 19 is a schematic diagram illustrating a process for phase and amplitude compensation of high frequency analog channels to be calibrated within a packet in an implementation of the present application;

FIG. 20 is a schematic diagram illustrating a flow chart of determining an amplitude calibration factor of each high-frequency channel to be calibrated in a packet in the embodiment of the present application;

fig. 21 is a schematic flow chart illustrating a process of determining a phase calibration factor for each high-frequency channel to be calibrated in a packet in the embodiment of the present application;

FIG. 22 is a diagram illustrating a linear fit of phase in an embodiment of the present application;

fig. 23 is a schematic structural diagram schematically illustrating a communication calibration apparatus in an embodiment of the present application;

fig. 24 schematically shows a structure of a communication apparatus provided in an embodiment of the present application.

Detailed Description

In order to improve calibration accuracy, the embodiment of the application provides a channel calibration method and a device thereof. The embodiment of the application can be applied to calibration of millimeter wave antennas, and can be particularly used for calibrating the broadband amplitude and the phase of an intermediate frequency analog channel and a high frequency analog channel.

The channel calibration method provided by the embodiment of the application can be applied to equipment with wireless transmitting and receiving functions, such as a base station, and is specifically used for calibrating transmitting channels of an intermediate frequency analog channel and a high frequency analog channel of a base station antenna.

Some technical terms in the embodiments of the present application will be described first.

The "base station" in the embodiment of the present application may be a RAN node or a base station. The RAN is the part of the network that accesses the terminal to the wireless network. A RAN node (or device) is a node (or device) in a radio access network, which may also be referred to as a base station. Currently, some examples of RAN nodes are: a gbb, a Transmission Reception Point (TRP), an evolved Node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved Node B, or home Node B, HNB), a Base Band Unit (BBU), or a wireless fidelity (Wifi) Access Point (AP), etc. In addition, in one network configuration, the RAN may include a Centralized Unit (CU) node and a Distributed Unit (DU) node.

The base station in this embodiment of the application may include multiple millimeter-wave band antennas, where one millimeter-wave band antenna corresponds to one digital channel, one digital channel corresponds to one intermediate-frequency analog channel, and one intermediate-frequency analog channel corresponds to multiple millimeter-wave high-frequency analog channels (hereinafter referred to as high-frequency analog channels), and a typical millimeter-wave high-frequency analog channel may be as shown in fig. 1 b.

It is to be understood that the terms "first," "second," and the like in the embodiments of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used are interchangeable under appropriate circumstances and can be implemented in sequences other than those illustrated or otherwise described herein with respect to the embodiments of the application, for example.

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

In the embodiment of the application, according to the characteristics of the millimeter wave system analog channel, a set of complete millimeter wave calibration scheme is provided, and the scheme adopts graded calibration, namely, the calibration is divided into two stages: and calibrating the intermediate-frequency analog channel and the high-frequency analog channel. Specifically, the intermediate frequency analog channel calibration is performed first, and then the high frequency analog channel calibration is performed on the basis of completing the intermediate frequency analog channel calibration.

As shown in fig. 3, the calibration of the intermediate frequency analog channel is performed by an on-line calibration method through a calibration coupling network, so as to estimate and track the amplitude and phase of the intermediate frequency analog channel in real time; the calibration of the high-frequency analog channel adopts an off-line calibration mode, namely calibration information of the high-frequency analog channel is obtained through testing and analyzing by a testing instrument, and the network equipment realizes the calibration of the high-frequency analog channel according to the calibration information through a mode of sending the calibration information.

As shown in fig. 4, the overall process of antenna calibration provided by the embodiment of the present application may include:

401: and carrying out intermediate frequency analog channel calibration.

Specifically, selecting an intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel to obtain an intermediate frequency analog channel group using the calibration reference channel as a calibration reference, wherein the intermediate frequency analog channel group includes the calibration reference channel and at least one intermediate frequency analog channel to be calibrated; and sending time domain calibration signals in groups through the intermediate frequency analog channels, performing frequency domain conversion on the time domain calibration signals received by the calibration port, and performing phase and amplitude compensation on the intermediate frequency analog channels to be calibrated in the groups by taking the calibration reference channels in the groups as calibration standards according to the frequency domain sequence obtained by conversion.

S402: and carrying out high-frequency analog channel calibration.

Specifically, a calibration sequence of the high-frequency analog channel is sent, high-frequency analog channel calibration information which is obtained and sent by the test equipment according to the measurement of the calibration sequence is received, and the high-frequency analog channel is calibrated according to the high-frequency analog channel calibration information.

The high-frequency analog channel calibration information may be obtained by analyzing a received calibration signal by a test device (e.g., a test instrument), and the test instrument sends the high-frequency analog channel calibration information obtained by the analysis to a device to be calibrated, so that the device calibrates the high-frequency analog channel according to the calibration information.

In the above embodiments of the present application, the calibration method of the intermediate frequency analog channel and the calibration method of the high frequency analog channel may be substantially the same, and may also be different in one or more of the following aspects:

(1) the number of calibration reference channels varies. The calibration method of the intermediate frequency analog channel adopts 1 calibration reference channel (or antenna) for calibration, and the calibration method of the high frequency analog channel adopts at least 2 calibration reference channels (or antennas) for calibration.

(2) The phase calibration factor is calculated in different ways. In the method for calibrating the intermediate frequency analog channel, the phase of the whole channel bandwidth is fitted by adopting a segmented sliding window, and in the method for calibrating the high frequency analog channel, the phase fitting is only carried out aiming at the central position of the channel.

(3) The amplitude calibration factor is calculated differently. In the calibration method of the intermediate frequency analog channel, a segmented sliding window is adopted for fitting in the whole channel bandwidth; in the high frequency analog channel calibration method, power averaging is performed over the entire bandwidth.

(4) And calculating the calibration coefficient. In the calibration method of the intermediate frequency analog channel, RE-level frequency domain calibration coefficients are calculated, and in the calibration method of the high frequency analog channel, bandwidth-level time domain calibration coefficients are calculated.

The calibration method of the intermediate frequency analog channel and the calibration method of the high frequency analog channel are described below.

In this embodiment of the present application, the intermediate frequency analog channel may be calibrated in an online manner, that is, a device to be calibrated (for example, a base station) sends a calibration signal, and a calibration coupling network (module) of the device to be calibrated receives the calibration signal and performs calibration processing.

Referring to fig. 5, a calibration procedure of the intermediate frequency analog channel provided in the embodiment of the present application is shown. As shown, the process may include the following steps:

s501: and grouping the intermediate frequency analog channels to be calibrated.

Specifically, in this step, one intermediate frequency analog channel is selected from the intermediate frequency analog channels to be calibrated as a calibration reference channel, and an intermediate frequency analog channel group in which the calibration reference channel is used as a calibration reference is obtained.

The intermediate frequency analog channel groups may be one or more, and may include two groups, for example. Each intermediate frequency analog channel group comprises a selected calibration reference channel and at least one intermediate frequency analog channel to be calibrated. The number of intermediate frequency analog channels to be calibrated within each packet may or may not be equal.

Taking 16 if analog channels in total as an example, if analog channel 0 can be selected from the 16 if analog channels as a calibration reference channel and divided into two if analog channel groups. As shown in the packet 0 shown in fig. 6a and the packet 1 shown in fig. 6b, the intermediate frequency analog channel corresponding to the diagonally filled square is the calibration reference channel, and the intermediate frequency analog channel corresponding to the gray filled square is the intermediate frequency analog channel to be calibrated in the packet. The 16 intermediate frequency analog channels are divided into 2 groups, the group numbers are 0 and 1 respectively, the group 0 contains T-8 intermediate frequency analog channels, and the group 1 contains T-9 intermediate frequency analog channels.

As shown by the blocks filled with diagonal lines and filled with gray in fig. 6a, the intermediate frequency analog channels contained in packet 0 include: an intermediate frequency analog channel 0 as a calibration reference, and a set of intermediate frequency analog channels [1, 2,3,4,5,6,7] to be calibrated.

As shown by the blocks filled with diagonal lines and filled with grey in fig. 6b, the intermediate frequency analog channels contained in packet 1 include: an intermediate frequency analog channel 0 as a calibration reference, and a set of intermediate frequency analog channels to be calibrated [8, 9,10,11,12,13,14,15 ].

Optionally, one intermediate frequency analog channel may be selected from the intermediate frequency analog channels to be calibrated as a calibration reference channel according to quantifiable indexes such as stability or signal-to-noise ratio of the intermediate frequency analog channels to be calibrated. By selecting the intermediate frequency analog channel with higher stability or better signal-to-noise ratio as the calibration reference channel, better calibration effect can be obtained.

S502: and calibrating in the frequency domain respectively aiming at each intermediate frequency analog channel group.

Specifically, in this step, as shown in fig. 7, the following steps may be performed for each intermediate frequency analog channel group:

s701: the time domain calibration signal is sent over the intermediate frequency analog channel within the packet.

S702: a time domain calibration signal is received through a calibration port.

S703: and performing frequency domain conversion on the time domain calibration signal received by the calibration port.

In this step, a received time domain calibration sequence x is applied_r(n) performing CP removal processing, performing FFT operation to convert the same into a frequency domain sequence, and performing FDM operation to obtain frequency domain received signals X from each transmission channel_t(k),t＝0～T-1,k＝0～N_RB-1。

S704: and according to the frequency domain sequence obtained by conversion, carrying out phase and amplitude compensation on the intermediate frequency analog channel to be calibrated in the packet by taking the calibration reference channel in the packet as a calibration standard.

Furthermore, calibration is carried out in a frequency domain, and avoidance can be carried out on other signals possibly mixed in a time domain signal.

Further, since the calibration of the intermediate frequency analog channel is performed in the frequency domain, the beam direction can be ignored compared to performing the calibration in the time domain.

Alternatively, in S701, as shown in fig. 8, the step of sending the time-domain calibration signal through the intermediate-frequency analog channel in the packet may include:

s801: the calibration sequence is mapped onto a Resource Block (RB) in the frequency domain.

Optionally, in this step, the calibration sequence may be mapped on subcarriers in the RB in the frequency domain. Optionally, the calibration sequence is not mapped on the dc subcarriers in the passband, so that the influence of dc offset on the calibration can be avoided.

Taking the intermediate Frequency analog channel packets shown in fig. 6a and fig. 6b as an example, each intermediate Frequency analog channel packet includes a calibration reference channel and a plurality of intermediate Frequency analog channels to be calibrated, and the calibration sequence is mapped in a Frequency domain according to a Frequency Division Multiplexing (FDM) manner. Fig. 9a shows the position of the dc sub-carriers within the pass band: RE0 and RE 6. To avoid mapping of the calibration sequences to the dc subcarriers, the mapping positions may be as shown in fig. 9b and 9c, wherein fig. 9b exemplarily shows the calibration sequence mapping positions of packet 0 and fig. 9c exemplarily shows the calibration sequence mapping positions of packet 1. The calibration sequence mapping may use one RB (one RB includes 12 REs) in the NR system as a unit, in order to avoid the dc subcarrier, RE0 and RE6 in the RB are not mapped for the time, and the mappable positions are RE1 to RE5, RE7 to RE11, and total 10 REs.

Alternatively, the calibration sequence may be generated first before the time domain calibration signal is transmitted, or the calibration sequence may be generated in advance. When generating the calibration sequence, N can be determined according to the number of RBs in the current bandwidth_RBGenerating a calibration sequence C (k) of corresponding length, k being 0-N_RB-1, the channels within each intermediate frequency analog channel packet can be calibrated using the calibration sequence.

S802 to S803: and converting the calibration sequence after the frequency domain mapping into a time domain calibration signal, and sending the time domain calibration signal through an intermediate frequency analog channel in a packet.

In this step, the calibration sequence after the frequency domain mapping is performed may be subjected to Inverse Fast Fourier Transform (IFFT), and then operations such as adding Cyclic Prefix (CP) may be performed to convert the calibration sequence into a time domain calibration signal x_rAnd (n) then transmitting.

Optionally, in S502, as shown in fig. 10, the step of performing phase and amplitude compensation on the to-be-calibrated intermediate frequency analog channels in the packet may include:

s1001: and performing channel estimation according to the frequency domain sequence obtained by conversion to obtain a channel estimation result of each intermediate frequency analog channel in the packet.

Optionally, in this step, a least square method (LS) may be used for channel estimation to obtain a channel estimation result H_t(k)＝X_t(k)·C^*(k)。

S1002: and according to the channel estimation result of each intermediate frequency analog channel in the packet, determining the amplitude calibration factor of each intermediate frequency channel to be calibrated in the packet by taking the calibration reference channel in the packet as a calibration standard.

In this step, the calculation process of the amplitude calibration factor may include: the average power of each intermediate frequency analog channel in the packet is calculated, the amplitude difference between the intermediate frequency analog channel to be calibrated in the packet and the calibration reference channel is calculated, and the amplitude calibration factor of each intermediate frequency channel to be calibrated in the packet is calculated, and the specific process can be seen in fig. 11.

S1003: and according to the channel estimation result of each intermediate frequency analog channel to be calibrated in the packet, determining the phase calibration factor of each intermediate frequency channel to be calibrated in the packet by taking the calibration reference channel in the packet as a calibration standard.

In this step, the calculation process of the phase calibration factor may include: extracting the phase of each intermediate frequency analog channel in the packet, performing phase fitting, calculating the phase difference between the intermediate frequency analog channel to be calibrated in the packet and the calibration reference channel, and calculating the phase calibration factor of each intermediate frequency channel to be calibrated in the packet, wherein the specific process can be seen in fig. 13.

S1004: and determining the calibration coefficient of each intermediate frequency analog channel to be calibrated according to the amplitude calibration factor and the phase calibration factor of each intermediate frequency analog channel.

In this step, for each intermediate frequency analog channel to be calibrated, the calculation method of the calibration coefficient is as follows:

wherein the content of the first and second substances,

is the amplitude calibration factor of the intermediate frequency analog channel (g, t),

is the phase calibration factor of the intermediate frequency analog channel (g, t),

and calculating the time domain broadband emission calibration coefficient of the obtained intermediate frequency analog channel (g, t). Wherein g is the packet number of the intermediate frequency analog channel, and t is the number of the intermediate frequency analog channel in one packet. Taking the if analog channel shown in fig. 6a and fig. 6b and selecting the if analog channel (0,0) as the calibration reference channel as an example, g is 0,1, and t is 0 to 15.

S1005: and compensating the intermediate frequency analog channels to be calibrated in the groups according to the calibration coefficient of each intermediate frequency analog channel to be calibrated.

As shown in fig. 11, determining the amplitude calibration factor in S1002 of the above process may include the following steps:

s1101: and determining the RB power of each intermediate frequency analog channel in the packet according to the channel estimation result of each intermediate frequency analog channel in the packet.

In this step, taking the intermediate frequency analog channel t in the packet g as an example, the RB power is:

P_g,t(k)＝10*log10(|H_g,t(k)|²)

then to P_g,t(k) Performing power sliding window fitting to obtain average power P_g,t,avg(k)。

Wherein, the average power of the calibration reference channel is:

P_g,t＝0＝10*log10(mean_k(|H_g,t(k)|²))

the power sliding window fitting process is illustrated here as a simple example. Assume full bandwidth of N_RB60 (this parameter is configurable), the position of the channel estimate in the RB is shown as the gray filled bar position in fig. 12 a.

The sliding window fitting may employ a window length of L_w15RB, where left and right guard bands are each L_GB3RB, each sliding distance L_S15-3 × 2 — 9RB, a total of the number of required slips D ═ (N)_RB-2·L_GB)/L_SFig. 12b and 12c show a schematic view of the sliding window as 6.

In the above figure, D is 0 to D-1, L_SThe power in each sliding window is considered to be approximately linear as the sliding distance between two adjacent sliding windows. At this time, group g, RB level power within channel t: p_g,t(k)＝10* log10(|H_g,t(k)|²) Fitting the power straight line in the sliding window d, wherein the formula is as follows:

step 1: and calculating average power. P_g,t,d＝mean_k(P_g,t(k)),k＝d·L_S～d·L_S+L_w-1。

By this step, the average value of the power of all the sliding window positions of each intermediate frequency analog channel in the full bandwidth range can be respectively determined.

Step 2: and (5) calculating the slope. Delta P_g,t,d＝mean_k(P_g,t(k+1)-P_g,t(k)),k＝d·L_S～d· L_S+L_w-2。

Through the step, the slope of the power curve of each intermediate frequency analog channel at all sliding window positions can be respectively determined according to the average value.

And step 3: and (6) fitting a straight line. P_g,t,new(k)＝P_g,t,d+ΔP_g,t,d·(k-k_avg) Wherein k is_avgIs the average power P_g,t,dCorresponding RB position, in this example, k_avg＝d·L_S+(L_w-1)/2, thereby obtaining a fitted curve (straight line).

And 4, step 4: and fitting RB power. After a fitting curve is obtained, the RB power is fitted, and for different sliding windows, the fitted RB is as shown in table 1:

TABLE 1

As can be seen from table 1, the edge sliding window (D0 or D-1) requires more calculation of L_GBSmoothed power of one RB. And combining all the k values in the sliding windows d in sequence to obtain a power smooth value of the intermediate frequency analog channel in the whole bandwidth.

S1102: and determining the power difference value between each intermediate frequency analog channel to be calibrated in the packet and the calibration reference channel in the packet.

In this step, the average power difference between the intermediate frequency analog channel to be calibrated (g, t) and the intra-packet calibration reference channel is:

ΔP_g,t＝P_g,t(k)-P_g,t＝0

wherein, Δ P_g,tIs the average power difference, P, between the intermediate frequency analog channel (g, t) to be calibrated and the intra-packet calibration reference channel_g,t(k) For the average power value, P, of the intermediate-frequency analog channels (g, t) to be calibrated_g,0To calibrate the average power value of the reference channel.

S1103: an amplitude calibration factor is determined for each intermediate frequency analog channel to be calibrated within the packet.

The amplitude calibration factor of the intermediate frequency analog channel to be calibrated in the packet is as follows:

according to the amplitude calibration factor, the RB power of the intermediate frequency analog channel to be calibrated can be leveled to the average power of the calibration reference channel. Alternatively, if the amplitude varies little within an RB, a may be assigned to each a_g,t(k) Repeating for 12 times to obtain RE-level amplitude factor

As shown in fig. 13, the determining the phase calibration factor in S1003 in the above flow may include the following steps:

s1301: and extracting the phase of each intermediate frequency analog channel in the packet according to the channel estimation result of each intermediate frequency analog channel in the packet.

In this step, taking the intermediate frequency analog channel group g as an example, according to the channel estimation result, the phase of the intermediate frequency analog channel in the group is extracted, and the phase in the intermediate frequency analog channel t in the group is:

s1302: and according to the phase of each intermediate frequency analog channel in the group, performing phase linear fitting on each intermediate frequency analog channel in a segmentation manner in a full bandwidth range to obtain the phase of the RE level.

In this step, linear fitting is performed on the full-bandwidth phase to obtain the phase of the RE level

Specifically, the phase linear fitting method is similar to the power sliding window linear fitting method described above, and is not described herein again.

S1303: and determining an inter-group reference channel phase difference according to the fitted phases, wherein the inter-group reference channel phase difference is equal to the difference between the phase of the bandwidth middle RE position of the calibration reference channel after the phase linear fitting in the first intermediate frequency analog channel group and the phase of the bandwidth middle RE position of the calibration reference channel after the phase linear fitting in the second intermediate frequency analog channel group.

In this step, taking two intermediate frequency analog channel groups (group 0 and group 1) as an example, when g is 0 and g is 1, the phase difference of the reference channel (i.e. the inter-group reference channel phase difference) is calibrated twice, that is:

the method is used for compensating the phase difference of the intermediate frequency analog channel to be calibrated when g is 0. That is, the inter-group reference channel phase difference is a phase difference between the reference channel phases in the two channel groups at the RE position (position where N is 6 × N _ RB) in the middle of the bandwidth after phase fitting.

S1304: a phase calibration factor is determined for each intermediate frequency analog channel to be calibrated within the packet.

Determining a phase calibration factor of the intermediate frequency channel to be calibrated according to the phase of the RE level of the intermediate frequency analog channel to be calibrated and the phase difference of the component reference channel for the intermediate frequency analog channel to be calibrated in the first intermediate frequency analog channel group; and determining a phase calibration factor of the intermediate frequency channel to be calibrated according to the phase of the RE level of the intermediate frequency channel to be calibrated for the intermediate frequency analog channel to be calibrated in the second intermediate frequency analog channel group.

In this step, taking two intermediate frequency analog channel groups (group 0 and group 1) and taking group 0 as the basis of phase calibration as an example, for group 1, there is no need to perform phase alignment processing, that is, there is no need to calculate the phase calibration factor of the intermediate frequency analog channels to be calibrated in group 1, or the phase calibration factor of these channels is equal to 1; for packet 0, the intermediate frequency analog channels to be calibrated need to be phase-aligned, i.e., the phase calibration factors for these channels need to be calculated. And vice versa.

The phase calibration factor is calculated as:

for analog channels to be calibrated in the other packets:

wherein the content of the first and second substances,

is the inter-group reference channel phase difference; wherein g is the serial number of the intermediate frequency analog channel group, and t is the intermediate frequency analog channelThe number of (2).

In this embodiment of the application, the high-frequency analog channel may be calibrated in an off-line manner, that is, a device to be calibrated (e.g., a base station) sends a calibration signal, a test instrument independent of the device to be calibrated receives the calibration signal, a calibration coefficient of the high-frequency analog channel is obtained through off-line analysis, and the calibration coefficient is sent to the device to be calibrated through configuration information, so that the device to be calibrated performs calibration of the high-frequency analog channel.

The embodiment of the present application does not limit the calibration method for the high-frequency analog channel, and the embodiment of the present application only provides one possible calibration method for the high-frequency analog channel.

Referring to fig. 14, a calibration procedure of a high-frequency analog channel is provided in the embodiment of the present application. As shown, the process may include the following steps:

s1401: and grouping the high-frequency analog channels to be calibrated.

Specifically, in this step, at least two high-frequency analog channels are selected from the high-frequency analog channels to be calibrated as calibration reference channels, and a high-frequency analog channel group is obtained with each calibration reference channel as a calibration reference.

Among the at least two high-frequency analog channels serving as calibration reference channels, different high-frequency analog channels correspond to different digital channels. For example, one of the plurality of high-frequency analog channels corresponding to the first digital channel may be selected as a calibration reference channel, and one of the plurality of high-frequency analog channels corresponding to the second digital channel may be selected as a calibration reference channel, where the second digital channel and the second digital channel are different digital channels.

Each high-frequency analog channel group comprises a main calibration reference channel serving as a calibration standard in the group and at least one high-frequency analog channel to be calibrated, the at least one high-frequency analog channel to be calibrated comprises an auxiliary calibration reference channel, and the auxiliary calibration reference channel is other high-frequency analog channels except the main calibration reference channel in the group in the high-frequency analog channels selected as the calibration reference channels.

Taking as an example that two high-frequency analog channels are selected as calibration reference channels and divided into two high-frequency analog channel groups, in S1401, a first high-frequency analog channel may be selected from the high-frequency analog channels to be calibrated as a first calibration reference channel, and a second high-frequency analog channel may be selected as a second calibration reference channel, and a high-frequency analog channel group using the first calibration reference channel as a calibration reference and a high-frequency analog channel group using the second calibration reference channel as a calibration reference are obtained according to the first calibration reference channel and the second calibration reference channel, respectively.

The high-frequency analog channel group taking the first calibration reference channel as the calibration reference comprises Q high-frequency analog channel groups, wherein the ith (1< ═ i < ═ Q) group in the Q high-frequency analog channel groups comprises the first calibration reference channel which is the main calibration reference channel in the group and the ith high-frequency analog channel in each digital channel in (P/2) digital channels to be calibrated, wherein P is M/Q, M is the number of the high-frequency analog channels, P is the number of the digital channels, and Q is the number of the high-frequency analog channels in one digital channel.

Similarly, Q high-frequency analog channel packets are included in the high-frequency analog channel packet with the second calibration reference channel as the calibration reference, and the ith packet of the Q high-frequency analog channel packets includes the second calibration reference channel as the main calibration reference channel within the packet and includes the ith high-frequency analog channel in each of the (P/2) digital channels to be calibrated.

That is, each high-frequency analog channel group includes, in addition to the main calibration reference channel including the group, an auxiliary calibration reference channel, which is one of the digital channels where the other calibration reference channels are located, in the high-frequency analog channels to be calibrated, so that the first calibration reference channel and the second calibration reference channel appear alternately in the group with the first calibration reference channel as a calibration reference (i.e., the group with the first calibration reference channel as the main calibration reference channel) and in the group with the second calibration reference channel as a calibration reference (i.e., the group with the second calibration reference channel as the main calibration reference channel).

Take the example of selecting two high frequency analog channels as calibration reference channels, wherein one is the main calibration reference channel corresponding to the high frequency analog channel (p)_ref0,q_ref0) The other is an auxiliary calibration reference channel corresponding to a high-frequency analog channel (p)_ref1,q_ref1) And has p_ref0≠p_ref1I.e. the two calibration reference channels are not in the same digital channel, where p_ref0,p_ref1∈[0,P-1],q_ref0,q_ref1∈[0,Q-1]。

Taking the high frequency analog channel of the millimeter-wave band antenna shown in fig. 1b as an example, the high frequency analog channel (0,0) may be selected as the first calibration reference channel and the high frequency analog channel (8,0) may be selected as the second calibration reference channel from M — 64 high frequency analog channels, as shown by the high frequency analog channel filled with oblique lines in fig. 15 a. That is, the two calibration reference channels selected are: (p)_ref0,q_ref0)＝(0,0)，(p_ref1,q_ref1)＝(8,0)。

With the high-frequency analog channel (0,0) as the calibration reference channel, 4 high-frequency analog channel groups can be obtained, and the group number can be expressed as g ═ 0,1,2, 3; with the high-frequency analog channel (8,0) as the calibration reference channel, 4 high-frequency analog channel groups can be obtained, and the group number can be represented as p ═ 4,5,6, 7.

As shown by the boxes filled with diagonal lines and filled with gray in fig. 15b, the high frequency analog channels contained in packet 0 include: high frequency analog channels (0,0) as calibration references, and a set of high frequency analog channels to be calibrated. If the high frequency analog channel is represented in the form of (digital channel number, number of high frequency channel in digital channel), the set is [ (1,0), (2,0), (3,0), (4,0), (5,0), (6,0), (7,0), (8,0) ], where the high frequency analog channel (8,0) is the secondary calibration reference channel, while the high frequency analog channel (8,0) is also the primary calibration reference channel of the other 4 packets (packet 4, packet 5, packet 6, packet 7).

If the high-frequency analog channel is represented by (packet number, digital channel number within the packet), the main reference calibration channel in the packet 0 is the high-frequency analog channel (0,0), and the set of high-frequency analog channels to be calibrated is [ (0,1), (0,2), (0,3), (0,4), (0,5), (0,6), (0,7), (0,8) ], where the high-frequency analog channel (0,8) is also the main calibration reference channel of the other 4 packets (packet 4, packet 5, packet 6, packet 7).

As shown by the boxes filled with diagonal lines and filled with gray in fig. 15c, the high frequency analog channels included in packet 1 include: high frequency analog channels (0,0) as calibration references, and a set of high frequency analog channels to be calibrated. If the high-frequency analog channels are represented in the form of (digital channel numbers, numbers of the high-frequency channels in the digital channels), the set is [ (1,1), (2,1), (3,1), (4,1), (5,1), (6,1), (7,1), (8,1) ], wherein the high-frequency analog channels (8,1) are auxiliary calibration reference channels, and the high-frequency analog channels (8,0) in the digital channels in which the high-frequency analog channels (8,1) are located are simultaneously main calibration reference channels of the other 4 packets (packet 4, packet 5, packet 6, packet 7).

If the high-frequency analog channel is represented by (packet number, digital channel number within the packet), the main reference calibration channel in the packet 1 is the high-frequency analog channel (1,0), and the set of high-frequency analog channels to be calibrated is [ (1,1), (1,2), (1,3), (1,4), (1,5), (1,6), (1,7), (1,8) ], where the high-frequency analog channel (1,8) is also the main calibration reference channel of the other 4 packets (packet 4, packet 5, packet 6, packet 7).

As shown by the blocks of diagonal and gray fill in fig. 15d, the high frequency analog channels contained in packet 2 include: high frequency analog channels (0,0) as calibration references, and a set of high frequency analog channels to be calibrated. If the high-frequency analog channels are represented in the form of (digital channel numbers, numbers of the high-frequency channels in the digital channels), the set is [ (1,2), (2,2), (3,2), (4,2), (5,2), (6,2), (7,2), (8,2) ], wherein the high-frequency analog channels (8,2) are secondary calibration reference channels, and the high-frequency analog channels (8,0) in the digital channels in which the high-frequency analog channels (8,2) are located are simultaneously primary calibration reference channels of the other 4 packets (packet 4, packet 5, packet 6, packet 7).

If the high-frequency analog channel is represented by (packet number, digital channel number within the packet), the main reference calibration channel in the packet 2 is the high-frequency analog channel (2,0), and the high-frequency analog channels to be calibrated are set to [ (2,1), (2,2), (2,3), (2,4), (2,5), (2,6), (2,7), (2,8) ], where the high-frequency analog channel (2,8) is also the main calibration reference channel of the other 4 packets (packet 4, packet 5, packet 6, packet 7).

As shown by the boxes filled with diagonal lines and filled with gray in fig. 15e, the high frequency analog channels contained in packet 3 include: high frequency analog channels (0,0) as calibration references, and a set of high frequency analog channels to be calibrated. If the high-frequency analog channels are represented in the form of (digital channel numbers, numbers of the high-frequency channels in the digital channels), the set is [ (1,3), (2,3), (3,3), (4,3), (5,3), (6,3), (7,3), (8,3) ], wherein the high-frequency analog channels (8,3) are secondary calibration reference channels, and the high-frequency analog channels (8,0) in the digital channels in which the high-frequency analog channels (8,3) are located are simultaneously primary calibration reference channels of the other 4 packets (packet 4, packet 5, packet 6, packet 7).

If the high-frequency analog channel is represented by (packet number, digital channel number within the packet), the main reference calibration channel in the packet 3 is the high-frequency analog channel (3,0), and the set of high-frequency analog channels to be calibrated is [ (3,1), (3,2), (3,3), (3,4), (3,5), (3,6), (3,7), (3,8) ], where the high-frequency analog channel (3,8) is also the main calibration reference channel of the other 4 packets (packet 4, packet 5, packet 6, packet 7).

As shown by the boxes filled with diagonal lines and filled with gray in fig. 15f, the high frequency analog channels contained in packet 4 include: a high frequency analog channel (8,0) as a calibration reference, and a set of high frequency analog channels to be calibrated. If the high frequency analog channel is represented in the form of (digital channel number, number of high frequency channel in digital channel), the set is [ (9,0), (10,0), (11,0), (12,0), (13,0), (14,0), (15,0), (0,0) ], where the high frequency analog channel (0,0) is the secondary calibration reference channel, and the high frequency analog channel (0,0) is also the primary calibration reference channel of the other 4 packets (packet 0, packet 1, packet 2, packet 3).

If the high-frequency analog channel is represented by (packet number, digital channel number within the packet), the main reference calibration channel in the packet 4 is the high-frequency analog channel (4,0), and the set of high-frequency analog channels to be calibrated is [ (4,1), (4,2), (4,3), (4,4), (4,5), (4,6), (4,7), (4,8) ], where the high-frequency analog channel (4,8) is also the main calibration reference channel of the other 4 packets (packet 4, packet 5, packet 6, packet 7).

As shown by the blocks of diagonal and gray fill in fig. 15g, the high frequency analog channels contained in packet 5 include: a high frequency analog channel (8,0) as a calibration reference, and a set of high frequency analog channels to be calibrated. If the high-frequency analog channels are represented in the form of (digital channel numbers, numbers of the high-frequency channels in the digital channels), the set is [ (9,1), (10,1), (11,1), (12,1), (13,1), (14,1), (15,1), (0,1) ], wherein the high-frequency analog channel (0,1) is a secondary calibration reference channel, and the high-frequency analog channel (0,0) in the digital channel in which the high-frequency analog channel (0,1) is located is also a primary calibration reference channel of the other 4 packets (packet 0, packet 1, packet 2, packet 3).

If the high-frequency analog channel is represented by (packet number, digital channel number within the packet), the main reference calibration channel in the packet 5 is the high-frequency analog channel (5,0), and the high-frequency analog channels to be calibrated are set to [ (5,1), (5,2), (5,3), (5,4), (5,5), (5,6), (5,7), (5,8) ], where the high-frequency analog channel (5,8) is also the main calibration reference channel of the other 4 packets (packet 4, packet 5, packet 6, packet 7).

As shown by the blocks of diagonal and gray fill in fig. 15h, the high frequency analog channels contained in packet 6 include: a high frequency analog channel (8,0) as a calibration reference, and a set of high frequency analog channels to be calibrated. If the high-frequency analog channels are represented in the form of (digital channel numbers, numbers of the high-frequency channels in the digital channels), the set is [ (9,2), (10,2), (11,2), (12,2), (13,2), (14,2), (15,2), (0,2) ], wherein the high-frequency analog channels (0,2) are secondary calibration reference channels, and the high-frequency analog channels (0,0) in the digital channels where the high-frequency analog channels (0,2) are located are simultaneously primary calibration reference channels of the other 4 packets (packet 0, packet 1, packet 2, packet 3).

If the high-frequency analog channel is represented by (packet number, digital channel number within the packet), the main reference calibration channel in the packet 6 is the high-frequency analog channel (6,0), and the set of high-frequency analog channels to be calibrated is [ (6,1), (6,2), (6,3), (6,4), (6,5), (6,6), (6,7), (6,8) ], where the high-frequency analog channel (6,8) is also the main calibration reference channel of the other 4 packets (packet 4, packet 5, packet 6, packet 7).

As shown by the boxes filled with diagonal lines and filled with gray in fig. 15i, the high frequency analog channels included in the packet 7 include: a high frequency analog channel (8,0) as a calibration reference, and a set of high frequency analog channels to be calibrated. If the high-frequency analog channels are represented in the form of (digital channel numbers, numbers of the high-frequency channels in the digital channels), the set is [ (9,3), (10,3), (11,3), (12,3), (13,3), (14,3), (15,3), (0,3) ], wherein the high-frequency analog channels (0,3) are secondary calibration reference channels, and the high-frequency analog channels (0,0) in the digital channels in which the high-frequency analog channels (1,3) are located are simultaneously primary calibration reference channels of the other 4 packets (packet 0, packet 1, packet 2, packet 3).

If the high-frequency analog channel is represented by (packet number, digital channel number within the packet), the main reference calibration channel in the packet 7 is the high-frequency analog channel (7,0), and the set of high-frequency analog channels to be calibrated is [ (7,1), (7,2), (7,3), (7,4), (7,5), (7,6), (7,7), (7,8) ], where the high-frequency analog channel (7,8) is also the main calibration reference channel of the other 4 packets (packet 4, packet 5, packet 6, packet 7).

Optionally, at least two high-frequency analog channels may be selected from the high-frequency analog channels to be calibrated as calibration reference channels according to quantifiable indexes such as stability or signal-to-noise ratio of the high-frequency analog channels to be calibrated. By selecting a high-frequency analog channel with high stability or excellent signal-to-noise ratio as a calibration reference channel, a good calibration effect can be obtained.

S1402: calibration is performed in the frequency domain for each high frequency analog channel packet.

Specifically, in this step, as shown in fig. 16, the following steps may be performed for each high-frequency analog channel group:

s1601: the time domain calibration signal is sent over the high frequency analog channels within the packet. This step is performed by the device to be calibrated, such as a base station.

S1602: a time domain calibration signal is received through a calibration port. This step is performed by a test meter or the like.

S1603: and performing frequency domain conversion on the time domain calibration signal received by the calibration port. This step may be performed by the test meter or the device for test analysis.

In this step, a received time domain calibration sequence x is applied_r(n) performing CP removal processing, performing FFT operation to convert the frequency domain sequence into a frequency domain sequence, and performing FDM operation to obtain frequency domain received signals X received from the high frequency analog channels_t(k),t＝0～T-1,k＝0～N_RB-1。

S1604: and according to the frequency domain sequence obtained by conversion, determining a phase calibration coefficient and an amplitude calibration coefficient of the high-frequency analog channel to be calibrated in the group by taking the main calibration reference channel in the group as a calibration standard, and sending the phase calibration coefficient and the amplitude calibration coefficient to the equipment to be calibrated so as to enable the equipment to be calibrated to perform phase and amplitude compensation. This step may be determined by the test meter or the device for test analysis and sent to the device to be calibrated.

In the above embodiments of the present application, since the high-frequency analog channels to be calibrated are grouped, and one group includes the main calibration reference channel and the auxiliary calibration reference channel in the group, and the auxiliary calibration reference channel is used as the main calibration reference channel in the other groups, in this way, by using the staggered relative calibration manner, the intra-group calibration and the inter-group calibration can be implemented in one group, and compared with performing the intra-group calibration and the inter-group calibration respectively in a time domain calibration manner, the calibration convergence time can be shortened and the computation amount can be reduced. In addition, the above embodiments of the present application adopt a frequency domain calibration method and perform phase calibration in addition to amplitude calibration, so that on one hand, the phase difference between each calibration can be eliminated, and on the other hand, since the time delay between different high frequency analog channels appears as a phase difference in the frequency domain, the phase difference can be eliminated through phase calibration.

Alternatively, in S1601, as shown in fig. 17, the step of sending the time-domain calibration signal through the high-frequency analog channel in the packet may include:

s1701: the calibration sequence is mapped onto a Resource Block (RB) in the frequency domain.

Optionally, in this step, the calibration sequence may be mapped on subcarriers in the RB in the frequency domain. Optionally, the calibration sequence is not mapped to the dc subcarrier in the passband, so that the influence of dc offset on the calibration can be avoided.

Still taking the high-Frequency analog channels shown in fig. 1 and selecting the high-Frequency analog channels (0,0) and the high-Frequency analog channels (8,0) as calibration reference channels as an example, each high-Frequency analog channel group includes one main calibration reference channel and 8 high-Frequency analog channels to be calibrated, and the calibration sequence is mapped in Frequency domain in a Frequency Division Multiplexing (FDM) manner. Fig. 18a shows the position of the dc sub-carriers within one pass band: RE0 and RE 6. To avoid mapping the calibration sequences to the dc subcarriers, the mapping positions may be as shown in fig. 18b and fig. 18c, where fig. 18b exemplarily shows the calibration sequence mapping positions of the calibration reference channel dominated by the high-frequency analog channel (0,0), and fig. 18c exemplarily shows the calibration sequence mapping positions of the calibration reference channel dominated by the high-frequency analog channel (8, 0). The calibration sequence mapping may use one RB (one RB includes 12 REs) in the NR system as a unit, in order to avoid the dc subcarrier, RE0 and RE6 in the RB are not mapped for the time, and the mappable positions are RE1 to RE5, RE7 to RE11, and total 10 REs.

Alternatively, the calibration sequence may be generated first before the time domain calibration signal is transmitted, or the calibration sequence may be generated in advance. When generating the calibration sequence, N can be determined according to the number of RBs in the current bandwidth_RBGenerating a calibration sequence C (k) of corresponding length, k being 0-N_RB-1, the channels within each high frequency analog channel packet can be calibrated using the calibration sequence.

S1702-S1703: and converting the calibration sequence after the frequency domain mapping into a time domain calibration signal, and sending the time domain calibration signal through a high-frequency analog channel in a packet.

In this step, the calibration sequence after the frequency domain mapping is performed may be subjected to Inverse Fast Fourier Transform (IFFT), and then operations such as adding Cyclic Prefix (CP) may be performed to convert the calibration sequence into a time domain calibration signal x_r(n) And then transmitting.

Alternatively, in S1402, as shown in fig. 19, the step of performing phase and amplitude compensation on the high-frequency analog channels to be calibrated in the packet may include:

s1901: and performing channel estimation according to the frequency domain sequence obtained by conversion to obtain a channel estimation result of each high-frequency analog channel in the packet.

S1902: and according to the channel estimation result of each high-frequency analog channel in the packet, determining the amplitude calibration factor of each high-frequency channel to be calibrated in the packet by taking the main calibration reference channel in the packet as a calibration standard.

In this step, the calculation process of the amplitude calibration factor may include: calculating the average power of each high-frequency analog channel in the packet, calculating the amplitude difference between the main calibration reference channel and the high-frequency analog channel to be calibrated in the packet, and calculating the amplitude calibration factor of each high-frequency analog channel to be calibrated in the packet, the specific process can be seen in fig. 20.

S1903: and according to the channel estimation result of each high-frequency analog channel to be calibrated in the packet, determining the phase calibration factor of each high-frequency channel to be calibrated in the packet by taking the main calibration reference channel in the packet as a calibration standard.

In this step, the calculation process of the phase calibration factor may include: extracting the phase of each high-frequency analog channel in the packet, performing phase fitting, calculating the phase difference between the main calibration reference channel and the high-frequency analog channel to be calibrated in the packet, and calculating the phase calibration factor of each high-frequency analog channel to be calibrated in the packet, wherein the specific process can be seen in fig. 21.

S1904: and determining the calibration coefficient of each high-frequency analog channel to be calibrated according to the amplitude calibration factor and the phase calibration factor of each high-frequency analog channel.

In this step, for each high-frequency analog channel to be calibrated, the calculation method of the calibration coefficient is as follows:

c_tx,g,t＝a_g,t·ω_g,t

wherein, a_g,tFor high frequency analog channel (g, t) amplitude calibration factor, omega_g,tPhase calibration factor, c, for the high-frequency analog channels (g, t)_tx,g,tThe time domain broadband emission calibration coefficient of the high-frequency analog channel (g, t) is obtained through calculation. Where g is the packet number of the high frequency analog channel, and t is the number of the high frequency analog channel within one packet. Taking the high-frequency analog channel shown in fig. 1 and selecting the high-frequency analog channel (0,0) and the high-frequency analog channel (8,0) as calibration reference channels as examples, g is 0 to 7, and t is 0 to 8.

S1905: and compensating the high-frequency analog channels to be calibrated in the groups according to the calibration coefficient of each high-frequency analog channel to be calibrated.

As shown in fig. 20, S1902 in the above flow may include the following steps:

s2001: and determining the average power of each high-frequency analog channel in the packet according to the channel estimation result of each high-frequency analog channel in the packet.

In this step, taking the tth high-frequency analog channel in the g-th packet as an example, the average power is:

P_g,t＝10*log10(mean_k(|H_g,t(k)|²))

wherein, P_g,t＝0The power of the reference channel is calibrated for the master within the packet. And t is 1-8, the serial number of the high-frequency analog channel to be calibrated in the group, and g is 0-7, and the serial number of the high-frequency analog channel is the group number.

S2002: determining an average power difference value between each high-frequency analog channel to be calibrated in the group and a main calibration reference channel in the group, wherein the average power difference value comprises a first power difference value and a second power difference value, the second power difference value is an average power difference value between the main calibration reference channel in the group and an auxiliary calibration reference channel in the high-frequency analog channel to be calibrated in the group, and the first power difference value is an average power difference value between the high-frequency analog channel to be calibrated in the group and the main calibration reference channel in the group.

In this step, taking the main calibration channel in the group g as the high-frequency analog channel (g,0), and the auxiliary calibration channel as the high-frequency analog channel (g,8), as an example, the average power difference between the high-frequency analog channel to be calibrated (g, t) and the main calibration reference channel in the group is:

ΔP_g,t＝P_g,t-P_g,0,

wherein, Δ P_g,tIs the average power difference, P, between the high frequency analog channel to be calibrated (g, t) and the intra-packet main calibration reference channel_g,tFor the average power value, P, of the high-frequency analog channels (g, t) to be calibrated_g,0And calibrating the average power value of the reference channel for the main.

Wherein the intra-packet master calibration reference channel (p)_ref0,q_ref0) With a secondary calibration reference channel (p)_ref1,q_ref1) Average power difference Δ P between_g＝0,t＝8It also needs to be calculated and stored for use in the subsequent steps.

Taking the packet 0 shown in fig. 15b as an example, the high frequency analog channels are represented as (packet number, digital channel number in the packet), then in the packet, the high frequency analog channel (0,0) is the main calibration reference channel in the packet, the high frequency analog channel (8,0) is the auxiliary calibration reference channel in the packet, and the set of high frequency analog channels to be calibrated is [ (0,1), (0,2), (0,3), (0,4), (0,5), (0,6), (0,7), (0,8) ]. Then there are:

the first power difference includes an average power difference between each high-frequency analog channel in the high-frequency analog channel set to be calibrated and the main calibration reference channel in the group, and specifically includes:

power difference between high frequency analog channel (0,1) and main calibration reference channel (0, 0):

ΔP_0,1＝P_0,1-P_0,0

power difference between high frequency analog channel (0,2) and main calibration reference channel (0, 0):

ΔP_0,2＝P_0,2-P_0,0

power difference between high frequency analog channel (0,3) and main calibration reference channel (0, 0):

ΔP_0,3＝P_0,3-P_0,0

power difference between high frequency analog channel (0,4) and main calibration reference channel (0, 0):

ΔP_0,4＝P_0,4-P_0,0

power difference between high frequency analog channel (0,5) and main calibration reference channel (0, 0):

ΔP_0,5＝P_0,5-P_0,0

power difference between high frequency analog channel (0,6) and main calibration reference channel (0, 0):

ΔP_0,6＝P_0,6-P_0,0

power difference between high frequency analog channel (0,7) and main calibration reference channel (0, 0):

ΔP_0,7＝P_0,7-P_0,0

power difference between high frequency analog channel (0,8) and main calibration reference channel (0, 0):

ΔP_0,8＝P_0,8-P_0,0

the second power difference is:

ΔP_0,8＝P_0,8-P_0,0

s2003: an amplitude calibration factor is determined for each high frequency analog channel to be calibrated within the packet.

The amplitude calibration factors of the high-frequency analog channels to be calibrated in the packets can be determined and obtained according to the first power difference value, and can also be determined and obtained according to the first power difference value and the second power difference value, so that in a plurality of packets taking the same high-frequency analog channel as a calibration standard, the amplitude calibration factors in one part of the packets are determined and obtained according to the first power difference value, and the amplitude calibration factors in the other part of the packets are calculated and obtained according to the first power difference value and the second power difference value.

Optionally, if the number of the packet is an odd number, the amplitude calibration factor of the high-frequency analog channel to be calibrated in the packet is determined according to the first power difference, otherwise, the amplitude calibration factor of the high-frequency analog channel to be calibrated in the packet is determined according to the first power difference and the second power difference. Of course, the opposite is true.

Specifically, the calculation formula of the amplitude calibration factor of the high-frequency analog channel (g, t) is as follows:

where Δ P is given when mod (g,2) is 0_ref-0, i.e. calculating the amplitude calibration factor for the high frequency analog channel (g, t) only with the first power difference value; if mod (g,2) is 1, then there is Δ P_ref＝ΔP_g＝0,t＝8And calculating the amplitude calibration factor of the high-frequency analog channel (g, t) by using the first power difference value and the second power difference value.

As shown in fig. 21, S1903 in the above flow may include the following steps:

s2101: and extracting the phase of each high-frequency analog channel in the packet according to the channel estimation result of each high-frequency analog channel in the packet.

In this step, taking the g-th high-frequency analog channel grouping as an example, according to the channel estimation result, the phase of the high-frequency analog channel in the g-th grouping is extracted, and the phase in the t-th high-frequency analog channel is:

the operation of extracting the phase can be realized by CORDIC or table lookup.

S2102: and performing linear fitting on the phase of the central position of the bandwidth according to the phase of each high-frequency analog channel in the packet.

In the step, the phase position of the center position of the bandwidth can be subjected to linear fitting to obtain

If N is present_RBAn even number, with RB and RE numbering pairs centered on the bandwidth of

If N is present_RBIs odd, and the RB and RE number pairs in the center of the bandwidth are

Specifically, the phase linear fitting method comprises the following steps:

let L be the number of RBs used for phase linear fitting, take L3, (p, q) 1,1 as an example, and let N be_RB66, the selected L-3 RB numbers are 32,33,34, and the RB and RE numbers corresponding to the bandwidth center position are (k)_RB,mid,k_RE,mid) The calibration sequence is on RE2 for each RB as shown in fig. 22 (33, 0).

Taking out

The method comprises the following steps of calculating a straight line fitted by phases, wherein g is 1, t is 1, k is 32-34, the straight line fitted by the phases comprises an initial phase and a slope, and the calculation methods are respectively as follows:

initial phase:

the corresponding frequency domain positions are: k is a radical of_RB,avg＝ mean(k)＝33,k＝32～34，k _RE,avg2; if L is selected as an even number, the frequency domain offset of plus 6 REs needs to be considered, which is not described herein.

Slope at RB level:

slope of RE level: k is a radical of_g,t,RE＝k_g,t,RB/12

At this time, the bandwidth center position (k)_RB,mid,k_RE,mid) The phase fitting results of (a) are:

wherein D is_RBIs b is_g,tCorresponding RB position k_RB,avgAnd bandwidth center RB position k_RB,midA difference of (2), i.e. D_RB＝k_RB,mid-k_RB,avgThis exampleIn (D)_RB＝0；D_REIs b is_g,tCorresponding to RE position k_RE,avgAnd the bandwidth center RE position k_RE,midA difference of (2), in this case D_RE＝-2。

Will D_RBAnd D_REBringing in

Calculating the expression, the bandwidth center phase fitting result of the present example can be obtained:

s2103: and determining a phase difference value between each high-frequency analog channel to be calibrated in the group and the main calibration reference channel in the group according to the fitted phase, wherein the phase difference value comprises a first phase difference value and a second phase difference value, the second phase difference value is a phase difference value between the main calibration reference channel in the group and an auxiliary calibration reference channel in the high-frequency analog channels to be calibrated in the group, and the first phase difference value is a phase difference value between the high-frequency analog channel to be calibrated in the group and the main calibration reference channel in the group.

In this step, a

Then, calculating the phase difference between the high-frequency analog channel (g, t) to be calibrated and the main calibration reference channel:

wherein the content of the first and second substances,

for the phase difference between the high frequency analog channel to be calibrated (g, t) and the main calibration reference channel within the packet,

for the phases of the high-frequency analog channels (g, t) to be calibrated,

the phase of the reference channel is calibrated for the master.

Wherein the intra-packet master calibration reference channel (p)_ref0,q_ref0) With a secondary calibration reference channel (p)_ref1,q_ref1) Phase difference value between

It also needs to be calculated and saved for use in subsequent steps.

S2104: a phase calibration factor is determined for each high frequency analog channel to be calibrated within the packet.

The phase calibration factors of the high-frequency analog channels to be calibrated in the groups can be determined and obtained according to the first phase difference value, and can also be determined and obtained according to the first phase difference value and the second phase difference value, so that in a plurality of groups which use the same high-frequency analog channel as a calibration reference, the phase calibration factors in one part of the groups are determined and obtained according to the first phase difference value, and the phase calibration factors in the other part of the groups are calculated and obtained according to the first phase difference value and the second phase difference value.

Optionally, if the number of the group is odd, the phase calibration factor of the high-frequency analog channel to be calibrated in the group is determined according to the first phase difference value, otherwise, the phase calibration factor of the high-frequency analog channel to be calibrated in the group is determined according to the first phase difference value and the second phase difference value. Of course, the opposite is true.

Specifically, the calculation formula of the phase calibration factor of the high-frequency analog channel (g, t) is as follows:

where mod (g,2) is 0, then

Calculating the amplitude calibration factor of the high-frequency analog channel (g, t) only by the first phase difference value; if mod (g,2) is 1, then there is

The amplitude calibration factor of the high-frequency analog channel (g, t) is calculated according to the first phase difference value and the second phase difference value.

Based on the same technical concept, the embodiment of the application also provides a channel calibration device, and the device can realize the channel calibration method provided by the embodiment of the application.

Fig. 23 illustrates a structure of a channel calibration device in an embodiment of the present application, and as shown in the figure, the device may include: a grouping module 2201 and a calibration module 2202.

A grouping module 2201, configured to select an intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel, and obtain an intermediate frequency analog channel group using the calibration reference channel as a calibration reference, where the intermediate frequency analog channel group includes the calibration reference channel and at least one intermediate frequency analog channel to be calibrated; sending time domain calibration signals through the intermediate frequency analog channel groups, carrying out frequency domain conversion on the time domain calibration signals received by a calibration port, and carrying out phase and amplitude compensation on the intermediate frequency analog channels to be calibrated in the groups by taking the calibration reference channel as a calibration standard according to a frequency domain sequence obtained by conversion;

a calibration module 2202, configured to send a calibration sequence of a high-frequency analog channel, receive high-frequency analog channel calibration information obtained and sent by a test device according to the measurement of the calibration sequence, and calibrate the high-frequency analog channel according to the high-frequency analog channel calibration information.

Optionally, the grouping module 2201 may be specifically configured to: and selecting one intermediate frequency analog channel from the intermediate frequency analog channels to be calibrated as a calibration reference channel according to the stability or the signal-to-noise ratio of the intermediate frequency analog channels to be calibrated.

Optionally, the calibration module 2202 may be specifically configured to: mapping a calibration sequence in a frequency domain onto subcarriers in an RB, wherein the calibration sequence is not mapped onto direct current subcarriers within a passband; converting the calibration sequence after the frequency domain mapping into a time domain calibration signal; and sending the time domain calibration signal through an intermediate frequency analog channel in the packet.

Optionally, the calibration module 2202 may be specifically configured to: performing channel estimation according to the frequency domain sequence obtained by conversion to obtain a channel estimation result of each intermediate frequency analog channel in the packet; according to the channel estimation result of each intermediate frequency analog channel in the packet, determining an amplitude calibration factor of each intermediate frequency channel to be calibrated in the packet by taking a calibration reference channel in the packet as a calibration standard; according to the channel estimation result of each intermediate frequency analog channel in the packet, determining a phase calibration factor of each intermediate frequency channel to be calibrated in the packet by taking a calibration reference channel in the packet as a calibration standard; determining a calibration coefficient of each intermediate frequency analog channel to be calibrated according to an amplitude calibration factor and a phase calibration factor of each intermediate frequency analog channel to be calibrated respectively; and compensating the intermediate frequency analog channels to be calibrated in the groups according to the calibration coefficient of each intermediate frequency analog channel to be calibrated.

Optionally, the calibration module 2202 may be specifically configured to: determining the average power of each intermediate frequency analog channel in the packet according to the channel estimation result of each intermediate frequency analog channel in the packet; determining the power difference between each intermediate frequency analog channel to be calibrated in the grouping and a calibration reference channel in the grouping according to the average power of each intermediate frequency analog channel in the grouping; and determining the amplitude calibration factor of each intermediate frequency analog channel to be calibrated in the packet according to the power difference.

Optionally, the calibration module 2202 may be specifically configured to: respectively determining the average value of the power of all sliding window positions of each intermediate frequency analog channel in the full bandwidth range, wherein one sliding window comprises a plurality of RBs; respectively determining the slope of the power curve of each intermediate frequency analog channel at all sliding window positions according to the average value; fitting to obtain a power curve according to the slope of the power curve; and fitting the RB power according to the power curve to obtain the average power of each intermediate frequency analog channel in the group.

Optionally, the calibration module 2202 may be specifically configured to: extracting the phase of each intermediate frequency analog channel in the packet according to the channel estimation result of each intermediate frequency analog channel in the packet; according to the phase of each intermediate frequency analog channel in the group, performing phase linear fitting on each intermediate frequency analog channel in a segmentation manner in a full bandwidth range to obtain the phase of the resource unit RE level; determining an inter-group reference channel phase difference equal to a difference between a phase of the calibration reference channel at a bandwidth middle RE position after a phase linear fit in the first if analog channel group and a phase of the bandwidth middle RE position after a phase linear fit in the second if analog channel group; for the intermediate frequency analog channels to be calibrated in the first intermediate frequency analog channel group, determining phase calibration factors of the intermediate frequency channels to be calibrated according to the phase of the RE level of the intermediate frequency analog channels to be calibrated and the phase difference of the inter-group reference channels; and determining a phase calibration factor of the intermediate frequency channel to be calibrated according to the phase of the RE level of the intermediate frequency channel to be calibrated for the intermediate frequency analog channel to be calibrated in the second intermediate frequency analog channel group.

Alternatively, the phase calibration factor may be determined according to a formula provided in an embodiment of the present application.

Optionally, the grouping module 2201 may be specifically configured to: selecting one intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel; and taking the calibration reference channel as a calibration reference to obtain a first intermediate frequency analog channel group and a second intermediate frequency analog channel group, wherein the first intermediate frequency analog channel group and the second intermediate frequency analog channel group both comprise the calibration reference channel.

It should be noted that, the apparatus provided in the embodiment of the present invention can implement all the method steps implemented by the method embodiment and achieve the same technical effect, and detailed descriptions of the same parts and beneficial effects as the method embodiment in this embodiment are omitted here.

Based on the same technical concept, the embodiment of the application also provides a communication device.

Fig. 24 schematically shows a structure of a communication apparatus in the embodiment of the present application. The communication device may be a base station. As shown, the communication device may include: a processor 2301, a memory 2302, a transceiver 2303 and a bus interface 2304.

The processor 2301 is responsible for managing the bus architecture and general processing, and the memory 2302 may store data used by the processor 2301 in performing operations. The transceiver 2303 is used for receiving and transmitting data under the control of the processor 2301.

The bus architecture may include any number of interconnected buses and bridges, with one or more processors, represented by the processor 2301, and various circuits, represented by the memory 2302, being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 2301 is responsible for managing the bus architecture and general processing, and the memory 2302 may store data used by the processor 2301 in performing operations.

The processes disclosed in the embodiments of the application can be applied to the processor 2301, or implemented by the processor 2301. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 2301. The processor 2301 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 2302, and the processor 2301 reads information in the memory 2302 to complete steps of the signal processing flow in combination with hardware thereof.

Specifically, the processor 2301 is configured to read computer instructions in the memory 2302 and execute the functions implemented in the flowchart shown in fig. 3.

In particular, the processor 2301 may be configured to perform the following operations:

Optionally, in the above operation, the selecting one intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel includes: and selecting one intermediate frequency analog channel from the intermediate frequency analog channels to be calibrated as a calibration reference channel according to the stability or the signal-to-noise ratio of the intermediate frequency analog channels to be calibrated.

Optionally, in the above operation, the sending the time-domain calibration signal through the intermediate-frequency analog channel packet includes: mapping a calibration sequence in a frequency domain onto subcarriers in an RB, wherein the calibration sequence is not mapped onto direct current subcarriers within a passband; converting the calibration sequence after the frequency domain mapping into a time domain calibration signal; and sending the time domain calibration signal through an intermediate frequency analog channel in the packet.

Optionally, in the above operation, the performing, according to the frequency domain sequence obtained by conversion, phase and amplitude compensation on the to-be-calibrated intermediate-frequency analog channel in the packet by using the calibration reference channel as a calibration standard includes: performing channel estimation according to the frequency domain sequence obtained by conversion to obtain a channel estimation result of each intermediate frequency analog channel in the packet; according to the channel estimation result of each intermediate frequency analog channel in the packet, determining an amplitude calibration factor of each intermediate frequency channel to be calibrated in the packet by taking a calibration reference channel in the packet as a calibration standard; according to the channel estimation result of each intermediate frequency analog channel in the packet, determining a phase calibration factor of each intermediate frequency channel to be calibrated in the packet by taking a calibration reference channel in the packet as a calibration standard; determining a calibration coefficient of each intermediate frequency analog channel to be calibrated according to an amplitude calibration factor and a phase calibration factor of each intermediate frequency analog channel to be calibrated respectively; and compensating the intermediate frequency analog channels to be calibrated in the groups according to the calibration coefficient of each intermediate frequency analog channel to be calibrated.

Optionally, in the above operation, the determining, according to the channel estimation result of each intermediate frequency analog channel in the packet, an amplitude calibration factor of each intermediate frequency channel to be calibrated in the packet by using a calibration reference channel in the packet as a calibration standard includes: determining the average power of each intermediate frequency analog channel in the packet according to the channel estimation result of each intermediate frequency analog channel in the packet; determining the power difference between each intermediate frequency analog channel to be calibrated in the grouping and a calibration reference channel in the grouping according to the average power of each intermediate frequency analog channel in the grouping; and determining the amplitude calibration factor of each intermediate frequency analog channel to be calibrated in the packet according to the power difference.

Optionally, in the above operation, the determining an average power of each intermediate frequency analog channel in the packet according to a channel estimation result of each intermediate frequency analog channel in the packet includes: respectively determining the average value of the power of all sliding window positions of each intermediate frequency analog channel in the full bandwidth range, wherein one sliding window comprises a plurality of RBs; respectively determining the slope of the power curve of each intermediate frequency analog channel at all sliding window positions according to the average value; fitting to obtain a power curve according to the slope of the power curve; and fitting the RB power according to the power curve to obtain the average power of each intermediate frequency analog channel in the group.

Optionally, in the above operation, the determining, according to the channel estimation result of each intermediate frequency analog channel in the packet, the phase calibration factor of each intermediate frequency channel to be calibrated in the packet by using the calibration reference channel in the packet as a calibration standard includes: extracting the phase of each intermediate frequency analog channel in the packet according to the channel estimation result of each intermediate frequency analog channel in the packet; according to the phase of each intermediate frequency analog channel in the group, performing phase linear fitting on each intermediate frequency analog channel in a segmentation manner in a full bandwidth range to obtain the phase of the resource unit RE level; determining an inter-group reference channel phase difference equal to a difference between a phase of the calibration reference channel at a bandwidth middle RE position after a phase linear fit in the first if analog channel group and a phase of the bandwidth middle RE position after a phase linear fit in the second if analog channel group; for the intermediate frequency analog channels to be calibrated in the first intermediate frequency analog channel group, determining phase calibration factors of the intermediate frequency channels to be calibrated according to the phase of the RE level of the intermediate frequency analog channels to be calibrated and the phase difference of the inter-group reference channels; and determining a phase calibration factor of the intermediate frequency channel to be calibrated according to the phase of the RE level of the intermediate frequency channel to be calibrated for the intermediate frequency analog channel to be calibrated in the second intermediate frequency analog channel group.

Alternatively, in the above operation, the phase calibration factor may be determined according to the formula in the embodiment of the present application.

Optionally, in the above operation, the selecting one intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel to obtain an intermediate frequency analog channel group using the calibration reference channel as a calibration reference includes: selecting one intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel; and taking the calibration reference channel as a calibration reference to obtain a first intermediate frequency analog channel group and a second intermediate frequency analog channel group, wherein the first intermediate frequency analog channel group and the second intermediate frequency analog channel group both comprise the calibration reference channel.

The embodiment of the present application further provides a computer-readable storage medium, in which computer-executable instructions are stored, and the computer-executable instructions are used for causing the computer to execute the method executed in the above embodiment.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A method of channel calibration, comprising:

selecting an intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel to obtain an intermediate frequency analog channel group using the calibration reference channel as a calibration standard, wherein the intermediate frequency analog channel group comprises the calibration reference channel and at least one intermediate frequency analog channel to be calibrated; sending time domain calibration signals through the intermediate frequency analog channel groups, carrying out frequency domain conversion on the time domain calibration signals received by the calibration port, and carrying out channel estimation according to a frequency domain sequence obtained by conversion to obtain a channel estimation result of each intermediate frequency analog channel in the groups;

compensating the intermediate frequency analog channels to be calibrated in the groups according to the calibration coefficient of each intermediate frequency analog channel to be calibrated;

2. The method of claim 1, wherein selecting one of the intermediate frequency analog channels to be calibrated as a calibration reference channel comprises:

and selecting one intermediate frequency analog channel from the intermediate frequency analog channels to be calibrated as a calibration reference channel according to the stability or the signal-to-noise ratio of the intermediate frequency analog channels to be calibrated.

3. The method of claim 1, wherein transmitting a time domain calibration signal over the intermediate frequency analog channel packet comprises:

4. The method of claim 1, wherein determining an amplitude calibration factor for each if channel to be calibrated in the packet based on the channel estimation result for each if analog channel in the packet and using a calibration reference channel in the packet as a calibration reference comprises:

5. The method of claim 4, wherein determining the average power of each if analog channel in the packet based on the channel estimates for each if analog channel in the packet comprises:

fitting to obtain a power curve according to the slope of the power curve;

6. The method of claim 1, wherein determining a phase alignment factor for each if channel to be aligned in the packet based on the channel estimation result for each if analog channel in the packet and using the alignment reference channel in the packet as an alignment reference comprises:

determining an inter-group reference channel phase difference equal to a difference between a phase of the calibration reference channel at a bandwidth middle RE position after a phase linear fit in a first if analog channel group and a phase of the bandwidth middle RE position after a phase linear fit in a second if analog channel group;

for the intermediate frequency analog channels to be calibrated in the first intermediate frequency analog channel group, determining phase calibration factors of the intermediate frequency channels to be calibrated according to the phase of the RE level of the intermediate frequency analog channels to be calibrated and the phase difference of the inter-group reference channels; and determining a phase calibration factor of the intermediate frequency channel to be calibrated according to the phase of the RE level of the intermediate frequency channel to be calibrated for the intermediate frequency analog channel to be calibrated in the second intermediate frequency analog channel group.

7. The method of claim 6, wherein the phase calibration factor is determined according to the following equation:

for the intermediate frequency analog channels to be calibrated in the first intermediate frequency analog channel group:

for the intermediate frequency analog channels to be calibrated in the second intermediate frequency analog channel group:

wherein the content of the first and second substances,

8. The method according to any one of claims 1 to 7, wherein selecting one intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel to obtain an intermediate frequency analog channel group with the calibration reference channel as a calibration reference comprises:

9. A communications apparatus, comprising: a processor, memory, transceiver; the processor is used for reading the computer instructions in the memory and executing:

selecting an intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel to obtain an intermediate frequency analog channel group using the calibration reference channel as a calibration standard, wherein the intermediate frequency analog channel group comprises the calibration reference channel and at least one intermediate frequency analog channel to be calibrated; sending time domain calibration signals in groups through the intermediate frequency analog channels, performing frequency domain conversion on the time domain calibration signals received by a calibration port, performing phase and amplitude compensation on the intermediate frequency analog channels to be calibrated in the groups by taking the calibration reference channel as a calibration reference according to a frequency domain sequence obtained by conversion, and performing channel estimation according to the frequency domain sequence obtained by conversion to obtain a channel estimation result of each intermediate frequency analog channel in the groups;

10. The communications apparatus as claimed in claim 9, wherein the processor is specifically configured to:

11. The communications apparatus as claimed in claim 9, wherein the processor is specifically configured to:

12. The communications apparatus as claimed in claim 9, wherein the processor is specifically configured to:

13. The communications apparatus as claimed in claim 9, wherein the processor is specifically configured to:

fitting to obtain a power curve according to the slope of the power curve;

14. The communications apparatus as claimed in claim 9, wherein the processor is specifically configured to:

15. The communications apparatus of claim 14, wherein the phase calibration factor is determined according to the following equation:

for analog channels to be calibrated in the second intermediate frequency analog channel group:

wherein the content of the first and second substances,

16. The communication apparatus according to any one of claims 9 to 15, wherein selecting one intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel to obtain an intermediate frequency analog channel packet with the calibration reference channel as a calibration reference comprises:

17. A channel calibration device, comprising:

the device comprises a grouping module, a calibration module and a control module, wherein the grouping module is used for selecting an intermediate frequency analog channel from intermediate frequency analog channels to be calibrated as a calibration reference channel to obtain an intermediate frequency analog channel group which takes the calibration reference channel as a calibration standard, and the intermediate frequency analog channel group comprises the calibration reference channel and at least one intermediate frequency analog channel to be calibrated; sending time domain calibration signals by the intermediate frequency analog channel groups, performing frequency domain conversion on the time domain calibration signals received by a calibration port, performing channel estimation according to a frequency domain sequence obtained by the conversion to obtain a channel estimation result of each intermediate frequency analog channel in the group, determining an amplitude calibration factor of each intermediate frequency channel to be calibrated in the group by taking a calibration reference channel in the group as a calibration standard according to the channel estimation result of each intermediate frequency analog channel in the group, determining a phase calibration factor of each intermediate frequency channel to be calibrated in the group by taking the calibration reference channel in the group as a calibration standard according to the channel estimation result of each intermediate frequency analog channel in the group, determining a calibration coefficient of each intermediate frequency analog channel to be calibrated according to the amplitude calibration factor and the phase calibration factor of each intermediate frequency analog channel to be calibrated respectively, and determining a calibration coefficient of each intermediate frequency analog channel to be calibrated respectively according to the calibration coefficient of each intermediate frequency analog channel to be calibrated, compensating the intermediate frequency analog channel to be calibrated in the packet;

18. A computer-readable storage medium having stored thereon computer-executable instructions for causing a computer to perform the method of any one of claims 1-8.