CN111130661B - Antenna correction method and device - Google Patents

Antenna correction method and device Download PDF

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Publication number
CN111130661B
CN111130661B CN201811291711.3A CN201811291711A CN111130661B CN 111130661 B CN111130661 B CN 111130661B CN 201811291711 A CN201811291711 A CN 201811291711A CN 111130661 B CN111130661 B CN 111130661B
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antennas
subcarriers
terminal devices
terminal
syndrome
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CN111130661A (en
Inventor
宋富强
坦波夫斯基·谢尔盖
谢尔盖·尼古拉耶维奇·杜多洛夫
田铅柱
李翔麟
肖宇翔
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Priority to CN201811291711.3A priority Critical patent/CN111130661B/en
Priority to PCT/CN2019/114450 priority patent/WO2020088549A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/084—Equal gain combining, only phase adjustments
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming

Abstract

The embodiment of the application provides an antenna calibration method and device, which are used for reducing the complexity of a communication system. The method comprises the following steps: the network equipment determines one or more correction sub-carriers of the M terminal equipment according to uplink pilot signals respectively sent by the M terminal equipment and received by the N antennas; aiming at the first syndrome subcarrier, the network equipment determines the receiving result of the first syndrome subcarrier of the first terminal equipment by the N antennas according to the uplink pilot signal sent by the first terminal equipment; the first terminal equipment is any one of the M terminal equipment; the first syndrome subcarrier is any subcarrier of one or more syndrome subcarriers; and determining uplink correction parameters corresponding to the N antennas respectively according to the receiving results of the N antennas on one or more correction subcarriers of the M terminal devices. By adopting the method, the antenna correction can be realized without the help of a far-field calibration antenna, and the complexity of a communication system is facilitated to be simplified.

Description

Antenna correction method and device
Technical Field
The present application relates to the field of wireless communications technologies, and in particular, to an antenna calibration method and apparatus.
Background
With the development of wireless communication technology, a base station in a communication system has a plurality of antennas. The base station realizes communication with the terminal equipment through a large-scale multiple-input multiple-output (massive MIMO) technology and a Beamforming (BF) technology based on an antenna array formed by a plurality of antennas, so that the flow of a communication system is greatly improved.
In the beamforming technology, a base station assigns a corresponding BF weight to each antenna in an antenna array, and adjusts the received signal strength or the transmitted signal strength of each antenna through the BF weight, so as to implement the receiving and transmitting of the antenna array in a specific direction.
The accuracy of the BF weight depends on the calibration of the antenna array, which can largely make the antennas have the same receive gain and transmit gain. In one existing far-field calibration scheme, a fixed far-field calibration antenna is provided in a communication system, and the far-field calibration antenna generates a specific calibration signal through a series of complex operations and sends the calibration signal to a base station. And the base station receives the calibration signal sent by the far-field calibration antenna and calibrates the gain of each antenna in the antenna array according to the calibration signal.
However, the provision of the far-field calibration antenna increases the complexity of the communication system, which is not favorable for simplification of the communication system.
Disclosure of Invention
The embodiment of the application provides an antenna correction method and device, which are used for reducing the complexity of a communication system while correcting an antenna.
In a first aspect, an embodiment of the present application provides an antenna calibration method, including: the network equipment determines one or more correction sub-carriers of the M terminal equipment according to uplink pilot signals respectively sent by the M terminal equipment and received by the N antennas of the network equipment; one or more correction subcarriers of the M terminal devices are obtained according to subcarriers carrying uplink pilot signals sent by the M terminal devices; wherein N is greater than 1 and M is greater than 1; for a first syndrome subcarrier, the network equipment determines a receiving result of the first syndrome subcarrier of the first terminal equipment by the N antennas according to an uplink pilot signal sent by the first terminal equipment, wherein the receiving result of the first syndrome subcarrier of the first terminal equipment by the N antennas comprises amplitude information and phase information of the first syndrome subcarrier when the uplink pilot signal sent by the first terminal equipment is received by the N antennas respectively; the first terminal equipment is any one of the M terminal equipment; the first syndrome subcarrier is any subcarrier of one or more syndrome subcarriers; and the network equipment determines uplink correction parameters corresponding to the N antennas respectively according to the receiving results of the N antennas on one or more correction subcarriers of the M terminal equipment.
By adopting the antenna correction method, the network equipment acquires uplink correction parameters corresponding to the N antennas in the network equipment by using the uplink pilot signals sent by the terminal equipment. Compared with a far-field correction scheme, a fixed far-field calibration antenna is not needed, and the complexity of the communication system is reduced.
Based on the first aspect, in a possible implementation manner, when determining, by the network device, uplink correction parameters corresponding to N antennas according to receiving results of the N antennas on one or more correction subcarriers of M terminal devices, the network device may perform: obtaining angle normalization coefficients corresponding to M terminal devices respectively according to the arrival angle AOA of the uplink pilot signal when the N antennas receive the uplink pilot signal sent by the M terminal devices respectively; and determining uplink correction parameters respectively corresponding to the N antennas according to the receiving results of the N antennas on one or more correction subcarriers of the M terminal devices and the obtained angle normalization coefficients respectively corresponding to the M terminal devices.
Based on the first aspect, in a possible implementation manner, the N antennas include a reference antenna; when the network device determines uplink correction parameters corresponding to the N antennas respectively according to the receiving results of the N antennas on one or more correction subcarriers of the M terminal devices, the network device may determine, for a first correction subcarrier, phase errors of N-1 antennas except for a reference antenna among the N antennas respectively relative to the reference antenna according to phase information in the receiving results of the N antennas on the first correction subcarriers of the M terminal devices; the network equipment determines array arrangement errors corresponding to the N antennas respectively according to phase errors of the N-1 antennas relative to the reference antenna and coordinates corresponding to the N antennas respectively; the network equipment further determines error coefficients of the receiving results of the N antennas to the first corrected subcarriers of the M terminal equipment according to the determined array arrangement errors respectively corresponding to the N antennas and the receiving results of the N antennas to the first corrected subcarriers of the M terminal equipment; and determining uplink correction parameters corresponding to the N antennas respectively according to the error coefficients of the receiving results of the N antennas to one or more correction subcarriers of the M terminal devices.
Because the receiving results of the N antennas on the first corrected subcarriers of the M terminal devices may be affected by the array arrangement errors, the embodiments of the present application may determine the array arrangement errors corresponding to the N antennas through the phase error of the N-1 antennas relative to the reference antenna and the coordinates corresponding to the N antennas, respectively, so that when performing antenna correction, the influence of the array arrangement errors on the receiving results of the N antennas on the first corrected subcarriers of the M terminal devices may be reduced, which is beneficial to improving the antenna correction accuracy.
Based on the first aspect, in a possible implementation manner, when determining an error coefficient of a reception result of the N antennas for the first subcarriers of the M terminal devices according to array configuration errors corresponding to the N antennas respectively and the reception result of the N antennas for the first subcarriers of the M terminal devices, the network device may determine equivalent effective BF weights corresponding to the N antennas respectively according to a preset beam forming BF weight of a reference antenna, array configuration errors corresponding to the N antennas respectively, and the reception result of the N antennas for the first subcarriers of the M terminal devices; and the network equipment further determines error coefficients of the receiving results of the first corrected subcarriers of the M terminal equipment by the N antennas according to the equivalent effective BF weights respectively corresponding to the N antennas and the preset BF weights respectively corresponding to the N antennas.
Due to the influence of errors added by antenna receiving, the equivalent effective BF weight determined by the network device according to the receiving result of the first correction subcarriers of the M terminal devices is different from the preset BF weight configured for the N antennas by the network device. According to the embodiment of the application, the error coefficients of the receiving results of the first correction subcarriers of the M terminal devices by the N antennas are determined through the equivalent effective BF weights and the preset BF weights corresponding to the N antennas respectively, so that the influence of the preset BF weights on the receiving results of the first correction subcarriers of the terminal devices is eliminated, and the errors of the antenna receiving gain can be represented to a certain extent through the error coefficients.
Based on the first aspect, in a possible implementation manner, when the network device determines the equivalent effective BF weights respectively corresponding to the N antennas according to the preset BF weight of the reference antenna and the array arrangement errors respectively corresponding to the N antennas, the network device may determine the BF weight errors respectively corresponding to the N antennas according to the preset BF weight of the reference antenna and the array arrangement errors respectively corresponding to the N antennas; the BF weight error of the antenna is used for representing the error of the equivalent effective BF weight of the antenna relative to the preset BF weight of the reference antenna; and the network equipment determines equivalent effective BF weights respectively corresponding to the N antennas according to the BF weight errors respectively corresponding to the N antennas and the preset BF weight of the reference antenna.
Based on the first aspect, in a possible implementation manner, the uplink pilot signal sent by the first terminal device is obtained by the first terminal device performing reciprocal operation on the received downlink pilot signal sent by the network device; wherein, the uplink pilot signal and the downlink pilot signal are carried on the same correction sub-carrier; after the network device determines the error coefficients of the receiving results of the first corrected subcarriers of the M terminal devices by the N antennas, the network device may also determine, for the first corrected subcarriers, the error coefficients of the sending results of the first corrected subcarriers of the M terminal devices by the N antennas according to the error coefficients of the receiving results of the first corrected subcarriers of the M terminal devices by the N antennas and the downlink pilot signals carried on the first subcarriers; and the network equipment determines downlink correction parameters respectively corresponding to the N antennas according to the error coefficients of the results sent by the N antennas to one or more correction subcarriers of the M terminal equipment.
In a second aspect, an embodiment of the present application further provides an antenna calibration apparatus, where the apparatus includes: a determination unit and a processing unit; the determining unit is configured to determine one or more syndrome subcarriers of M terminal devices according to uplink pilot signals received by the N antennas and respectively sent by the M terminal devices; one or more correction subcarriers of the M terminal devices are obtained according to subcarriers carrying uplink pilot signals sent by the M terminal devices; wherein N is greater than 1 and M is greater than 1; the determining unit is further configured to determine, for the first syndrome subcarrier, a reception result of the first syndrome subcarrier of the first terminal device by the N antennas according to the uplink pilot signal sent by the first terminal device, where the reception result of the first syndrome subcarrier of the first terminal device by the N antennas includes amplitude information and phase information of the first syndrome subcarrier when the uplink pilot signal sent by the first terminal device is received by the N antennas respectively; the first terminal equipment is any one of the M terminal equipment; the first syndrome subcarrier is any subcarrier of one or more syndrome subcarriers; and the processing unit is used for determining uplink correction parameters corresponding to the N antennas respectively according to the receiving results of the N antennas on one or more correction subcarriers of the M terminal devices.
Based on the second aspect, in a possible implementation manner, the processing unit is specifically configured to: obtaining angle normalization coefficients corresponding to M terminal devices respectively according to the arrival angle AOA of the uplink pilot signal when the N antennas receive the uplink pilot signal sent by the M terminal devices respectively; and determining uplink correction parameters respectively corresponding to the N antennas according to the receiving result of the N antennas on one or more correction subcarriers of the M terminal devices and the angle normalization coefficients respectively corresponding to the M terminal devices.
Based on the second aspect, in a possible implementation manner, the reference antenna is included in the N antennas; the processing unit is specifically configured to: for the first correction subcarrier, determining phase errors of N-1 antennas except the reference antenna in the N antennas relative to the reference antenna according to phase information in receiving results of the first correction subcarrier of the M terminal devices by the N antennas; determining array arrangement errors corresponding to the N antennas respectively according to the phase errors of the N-1 antennas relative to the reference antenna and the coordinates corresponding to the N antennas respectively; the network equipment determines error coefficients of the receiving results of the N antennas to the first corrected subcarriers of the M terminal equipment according to array arrangement errors corresponding to the N antennas respectively and the receiving results of the N antennas to the first corrected subcarriers of the M terminal equipment; and determining uplink correction parameters corresponding to the N antennas respectively according to the error coefficients of the receiving results of the N antennas to one or more correction subcarriers of the M terminal devices.
Based on the second aspect, in a possible implementation manner, the processing unit is specifically configured to: determining equivalent effective BF weights respectively corresponding to the N antennas according to a preset beam forming BF weight of the reference antenna, array arrangement errors respectively corresponding to the N antennas and receiving results of the N antennas on first correction subcarriers of the M terminal devices; and determining error coefficients of receiving results of the first corrected subcarriers of the M terminal devices by the N antennas according to equivalent effective BF weights respectively corresponding to the N antennas and preset BF weights respectively corresponding to the N antennas.
Based on the second aspect, in a possible implementation manner, the processing unit is specifically configured to: determining BF weight errors corresponding to the N antennas respectively according to a preset BF weight of the reference antenna and array arrangement errors corresponding to the N antennas respectively; the BF weight error of the antenna is used for representing the error of the equivalent effective BF weight of the antenna relative to the preset BF weight of the reference antenna; and determining equivalent effective BF weights corresponding to the N antennas respectively according to the BF weight errors corresponding to the N antennas respectively and the preset BF weight of the reference antenna.
Based on the second aspect, in a possible implementation manner, the uplink pilot signal sent by the first terminal device is obtained after the first terminal device performs reciprocal operation on the received downlink pilot signal; the uplink pilot signal and the downlink pilot signal are carried on the same correction sub-carrier; the processing unit is further configured to: for the first correction subcarrier, determining the error coefficient of the transmission result of the first correction subcarrier of the M terminal devices by the N antennas according to the error coefficient of the reception result of the first correction subcarrier of the M terminal devices by the N antennas and the downlink pilot signal carried by the first subcarrier; and determining downlink correction parameters respectively corresponding to the N antennas according to the error coefficients of the results sent by the N antennas to one or more correction subcarriers of the M terminal devices.
In a third aspect, an embodiment of the present application further provides an apparatus, where the apparatus includes: a processor and a memory; wherein the memory is used for storing program instructions; a processor for performing the method as provided in any one of the first aspect by calling program instructions stored in the memory.
In a fourth aspect, the present application further provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the method provided in any one of the first aspect.
Drawings
The drawings that are required to be used in the description of the embodiments are briefly described below.
FIG. 1 is a schematic diagram of a communication system;
fig. 2 is a schematic diagram of a communication relationship between a network device and a terminal device;
fig. 3 is a schematic flowchart of an antenna calibration method according to an embodiment of the present application;
fig. 4 is a flowchart illustrating a possible antenna calibration method according to an embodiment of the present disclosure;
fig. 5 is a schematic flow chart of a downlink correction method according to an embodiment of the present application;
FIG. 6 is a schematic view of an apparatus according to an embodiment of the present disclosure;
fig. 7 is a schematic diagram of an antenna calibration apparatus according to an embodiment of the present application.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings.
The technical scheme of the embodiment of the application can be applied to various communication systems, for example: long Term Evolution (LTE) systems, Worldwide Interoperability for Microwave Access (WiMAX) communication systems, future fifth Generation (5th Generation, 5G) systems, such as new radio access technology (NR), and future communication systems, such as 6G systems.
This application is intended to present various aspects, embodiments or features around a system that may include a number of devices, components, modules, and the like. It is to be understood and appreciated that the various systems may include additional devices, components, modules, etc. and/or may not include all of the devices, components, modules etc. discussed in connection with the figures. Furthermore, a combination of these schemes may also be used.
In addition, in the embodiments of the present application, the word "exemplary" is used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the term using examples is intended to present concepts in a concrete fashion.
The network architecture and the service scenario described in the embodiment of the present application are for more clearly illustrating the technical solution of the embodiment of the present application, and do not form a limitation on the technical solution provided in the embodiment of the present application, and as a person of ordinary skill in the art knows that along with the evolution of the network architecture and the appearance of a new service scenario, the technical solution provided in the embodiment of the present application is also applicable to similar technical problems.
Some scenarios in this application are described by taking an LTE system in a wireless communication network as an example, it should be noted that the scheme in this application may also be applied to other wireless communication networks, and corresponding names may also be replaced with names of corresponding functions in other wireless communication networks.
For the convenience of understanding the embodiments of the present application, a communication system applicable to the embodiments of the present application will be first described in detail by taking the communication system shown in fig. 1 as an example. As shown in fig. 1, the communication system includes a network device 101 and a plurality of terminal devices (102, 103, and 104), where the network device 101 may be configured with a plurality of antennas, and the terminal devices 102, 103, and 104 may also be configured with a plurality of antennas.
The network device 101 is a device with a wireless transceiving function or a chip that can be disposed in the device, and the device includes but is not limited to: evolved Node B (eNB), Radio Network Controller (RNC), Node B (NB), Base Station Controller (BSC), Base Transceiver Station (BTS), home base station (e.g., home evolved Node B, or home Node B, HNB), baseband unit (BBU), wireless fidelity (WIFI) system Access Point (AP), wireless relay Node, wireless backhaul Node, transmission point (TRP or transmission point, TP), etc., and may also be 5G, such as NR, a gbb in the system, or a transmission point (TRP or TP), a set (including multiple antennas) of a base station in the 5G system, or a panel of a base station (including multiple antennas, or a BBU) in the 5G system, or a Distributed Unit (DU), etc.
Terminal equipment 102, 103, and 104 may also be referred to as User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or user equipment. The terminal device in the embodiment of the present application may be a mobile phone (mobile phone), a tablet computer (Pad), a computer with a wireless transceiving function, a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a wireless terminal in industrial control (industrial control), a wireless terminal in self driving (self driving), a wireless terminal in remote medical (remote medical), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), and the like. The embodiments of the present application do not limit the application scenarios. In the present application, a terminal device having a wireless transceiving function and a chip that can be installed in the terminal device are collectively referred to as a terminal device.
With the development of wireless communication technology, more and more network devices 101 adopt the massive MIMO technology and the BF technology. As shown in fig. 2, network device 101 includes N antennas (1011, 1012, … …, 101N), where N is greater than 1, and network device 101 simultaneously receives uplink signals transmitted by terminal device 102 through the N antennas, and simultaneously transmits downlink signals to terminal device 102 through the N antennas. Taking the case that the network device 101 sends the downlink signal to the terminal device 102 as an example, the network device 101 configures a corresponding BF weight for each antenna according to the location information of the terminal device 102, so as to respectively adjust the amplitude and the phase of the downlink signal sent by each antenna, so that the downlink signal sent by the N antennas is shaped in the direction of the terminal device 102, thereby improving the strength of the downlink signal received by the terminal device 102. The communication between other terminal devices and the network device in the communication system is similar to that of the terminal device 102, and the description of the embodiment of the present application is omitted.
As can be seen from the above process, the beamforming effect between the network device 101 and the terminal device 102 is based on the precise adjustment of the BF weight on the amplitude and phase of the communication signal transmitted by the antenna. However, in practical applications, because the N antennas of the network device 101 have different transmit gains and receive gains, the beamforming effect generated by the BF weight still needs to be further improved. The transmission gain is used to indicate an amplification effect of a transmission channel inside an antenna on a downlink signal transmitted by the antenna when the network device 101 transmits the downlink signal. The reception gain is used to indicate an amplification effect of a reception channel inside the antenna on the uplink signal received by the antenna when the network device 101 receives the uplink signal.
When the receiving gains of the N antennas are different from each other, a certain error is brought to the beamforming result of the uplink signal by the BF weight, and similarly, when the transmitting gains of the N antennas are different from each other, a certain error is brought to the beamforming result of the downlink signal by the BF weight. Therefore, the network device 101 needs to calibrate the N antennas to eliminate the adverse effect of the difference between the receive gain and the transmit gain of the N antennas on beamforming.
As shown in fig. 1, in one far-field correction scheme, a far-field calibration antenna 105 is further included in the communication system, and typically, the position of the far-field calibration antenna 105 relative to the network device 101 is fixed. The far-field calibration antenna 105 may periodically send a calibration signal meeting a preset rule to the network device 101, and send the calibration signal to the network device 101. The network device 101 receives the calibration signal sent by the far-field calibration antenna 105 through the N antennas, and obtains phase information and amplitude information of the calibration signal respectively received by the N antennas. In addition, the network device 101 may further determine, according to a preset rule, ideal phase information and ideal amplitude information of the calibration signal received by the N antennas respectively. Then, the network device 101 may determine a receiving error of each of the N antennas according to the phase information and the amplitude information of the calibration signal actually received by each of the N antennas, and the ideal phase information and the ideal amplitude information of the calibration signal received by each of the N antennas, so as to determine uplink correction coefficients corresponding to the N antennas respectively. The uplink correction parameters are used for correcting the receiving gain of the antenna receiving channel, so that the corrected N antennas have the same receiving gain. However, the far-field calibration scheme as shown in fig. 1 requires an extra far-field calibration antenna 105 in the communication system, which increases the complexity of the communication system and further increases the operation and maintenance cost of the communication system.
In order to implement antenna calibration and reduce the complexity of a communication system, an embodiment of the present application provides an antenna calibration method, where the method implements calibration of multiple antennas in a network device 101 through uplink pilot signals sent by multiple terminal devices (terminal device 102, terminal device 103, and terminal device 104) in the network device 101, and may omit a far-field calibration antenna 105 from the communication system, thereby reducing the complexity of the communication system.
Fig. 3 is a schematic flowchart of an antenna calibration method according to an embodiment of the present application, and as shown in fig. 3, the method mainly includes the following steps:
s301: the network equipment determines one or more correction sub-carriers of the M terminal equipment according to uplink pilot signals respectively sent by the M terminal equipment and received by the N antennas of the network equipment; wherein, one or more correction sub-carriers of the M terminal devices are obtained according to sub-carriers carrying uplink pilot signals sent by the M terminal devices; wherein N is greater than 1 and M is greater than 1.
The M terminal devices are terminal devices which are in wireless communication connection with the network device. In this embodiment, M may be the number of preset terminal devices, or the number of terminal devices currently in wireless communication connection with a network device. As in the communication system of fig. 1, M may take on a value of 3.
Taking the terminal device 102 in the communication system shown in fig. 1 as an example, the uplink signal sent by the terminal device 102 to the network device 101 includes an uplink pilot signal, and the uplink pilot signal is located at one or more frequency points in the frequency domain, for example, the uplink pilot signal sent by the terminal device 102 is located at frequency point f1 and frequency point f2 in the frequency domain.
In a possible implementation manner, after receiving an uplink signal sent by the terminal device 102, the network device 101 may determine, according to a communication protocol, an uplink pilot signal in the uplink signal and one or more frequency points where the uplink pilot signal is located, where the uplink pilot signal sent by the terminal device 102 is located at a frequency point f1 and a frequency point f2, and then obtain a subcarrier 1 corresponding to the frequency point f1 and a subcarrier 2 corresponding to the frequency point f2, where a central frequency point of the subcarrier 1 is a frequency point f1, and a central frequency point of the subcarrier 2 is a frequency point f2, and the subcarrier corresponding to the terminal device 102 includes the subcarrier 1 and the subcarrier 2. Similarly, assuming that the subcarriers corresponding to terminal device 103 include subcarrier 2 and subcarrier 4 and the subcarrier corresponding to terminal device 104 is subcarrier 3, network device 101 may determine that the subcarriers corresponding to terminal device 102, terminal device 103, and terminal device 104 are subcarrier 1, subcarrier 2, subcarrier 3, and subcarrier 4.
S302: for a first syndrome subcarrier, the network equipment determines a receiving result of the first syndrome subcarrier of the first terminal equipment by the N antennas according to an uplink pilot signal sent by the first terminal equipment, wherein the receiving result of the first terminal equipment by the N antennas comprises amplitude information and phase information of the first syndrome subcarrier when the uplink pilot signal sent by the first terminal equipment is respectively received by the N antennas; the first terminal device is any one of M terminal devices, and the first syndrome subcarrier is any one of one or more syndrome subcarriers corresponding to the M terminal devices.
Taking the above subcarrier 1 as an example, please refer to fig. 2, the network device may determine that, when receiving the uplink pilot signal sent by the terminal device 102 on the subcarrier 1, the N antennas receive the subcarrier 1, which is the amplitude information and the phase information of the subcarrier 1, that is, the N antennas receive the subcarrier 1 of the terminal device 102. It can be understood that, taking terminal device 103 as an example, since the uplink pilot signal of terminal device 103 is carried on subcarrier 2 and subcarrier 4, and is not carried on subcarrier 1, the network device cannot receive the uplink pilot signal of terminal device 103 on subcarrier 1, and at this time, it may be considered that the reception result of subcarrier 1 of terminal device 103 by N antennas is 0.
S303: and the network equipment determines uplink correction parameters corresponding to the N antennas respectively according to the receiving results of the N antennas on one or more correction subcarriers of the M terminal equipment.
Taking the receiving result of the N antennas on the subcarrier 1 of the terminal device 102 as an example, the receiving result of the N antennas of the network device 101 on the subcarrier 1 of the terminal device 102 is affected by the receiving gain of the antennas, so after the receiving result of one or more corrected subcarriers of the M terminal devices is determined, the network device 101 can determine the effect of the receiving gain of the antennas on the receiving result according to the receiving result of the M terminal devices through certain operation, and further determine the correction parameters corresponding to the N antennas respectively.
With the antenna calibration method shown in fig. 3, the network device obtains uplink calibration parameters corresponding to N antennas in the network device by using the uplink pilot signal sent by the terminal device. Compared with a far-field correction scheme, a fixed far-field calibration antenna is not needed, and the complexity of the communication system is reduced. Moreover, compared with the existing antenna self-correction scheme, the antenna correction method shown in fig. 3 can realize far-field correction only by using the uplink service channel, does not need a complex coupling network, does not need to make a table on the scene, and has lower cost.
Next, the embodiment of the present application will take the communication system shown in fig. 1 as an example, and provide a practical specific operation method for the network device 101 to determine uplink correction parameters corresponding to N antennas, where the process mainly includes the following steps for a first correction subcarrier:
the method comprises the following steps: for any terminal device of the M terminal devices, such as the terminal device 102, a normalized covariance matrix is constructed according to the receiving result of the first syndrome subcarrier of the terminal device 102 by the N antennas.
Step two: and performing characteristic root decomposition on the normalized covariance matrix to obtain a plurality of characteristic roots of the normalized covariance matrix.
Step three: and determining the maximum feature root from the obtained feature roots, further determining a feature vector corresponding to the maximum feature root, and normalizing the feature vector. The feature vector may be a column vector including N elements.
Step four: and repeating the first step to the third step until obtaining the normalized eigenvectors corresponding to the M terminal devices respectively, thereby constructing an eigenvector matrix formed by the M normalized eigenvectors. The obtained feature matrix is an mxn matrix.
Step five: and calculating to obtain uplink correction parameters corresponding to the N antennas respectively by using the obtained characteristic matrix.
Through the steps, the receiving results of the N antennas for the first correction subcarriers of the M terminal devices are converted into the characteristic matrix, so that the receiving results of the N antennas for the first correction subcarriers of the M terminal devices can be calculated, and uplink correction parameters respectively corresponding to the N antennas are obtained according to the receiving results of the N antennas for one or more correction subcarriers of the M terminal devices.
In a communication system, the reception result of the N antennas on the syndrome of the terminal device is also affected by the angle of arrival (AOA) of the uplink pilot signal of the terminal device. Based on this, in a possible implementation manner, when the network device determines the uplink correction parameters corresponding to the N antennas respectively according to the receiving results of the N antennas on one or more correction subcarriers of the M terminal devices, the network device may obtain angle normalization coefficients corresponding to the M terminal devices respectively according to the arrival angles of the uplink pilot signals when the N antennas receive the uplink pilot signals sent by the M terminal devices respectively; and the network equipment determines uplink correction parameters respectively corresponding to the N antennas according to the receiving result of one or more correction subcarriers of the M terminal equipment of the N antennas and the angle normalization coefficients respectively corresponding to the M terminal equipment.
Taking the communication system shown in fig. 1 as an example, the network device 101 further affects the arrival angles of the uplink pilot signals of the terminal device 102, the terminal device 103, and the terminal device 104 and the terminal device 102, the terminal device 103, and the terminal device 104. The network device 101 may determine angle normalization coefficients corresponding to the terminal device 102, the terminal device 103, and the terminal device 104, respectively, according to the arrival angles of the uplink pilot signals of the terminal device 102, the terminal device 103, and the terminal device 104.
It should be understood that the angle normalization coefficient corresponding to the terminal device is a vector including N elements, and the N elements respectively correspond to N antennas of the network device.
In a possible implementation manner, the network device may determine one terminal device from the M terminal devices as a reference terminal, and normalize AOAs of uplink pilot signals of other terminals, except for the reference terminal, of the M terminal devices with respect to an AOA of the reference terminal. For example, in fig. 1, network device 101 may determine a terminal device from terminal device 102, terminal device 103, and terminal device 104, for example, terminal device 102 is used as a reference terminal, and normalize AOA of the uplink pilot signals of terminal device 103 and terminal device 104 with respect to AOA of the uplink pilot signal of terminal device 102.
By using the angle normalization coefficient obtained by the method, the uplink pilot signals of different AOAs can be normalized on the same AOA, so that the difference of the AOAs of the uplink pilot signals of different terminal equipment is reduced, the influence on the receiving results of the N antennas for receiving the correction subcarriers of different terminal equipment is reduced, and the antenna correction precision is improved.
In the embodiment of the present application, the reception result of the first syndrome of the M terminal devices by the N antennas includes amplitude information and phase information of the first syndrome. In a possible implementation manner, the network device may determine an antenna of the N antennas as a reference antenna, and determine phase errors of N-1 antennas of the N antennas except the reference antenna with respect to the reference antenna according to phase information in the reception results of the N antennas for the first subcarriers of the M terminal devices. As in fig. 1, network device 101 determines antenna 1012 as the reference antenna, determines antenna 1011, and phase errors of antennas 1013 to 101N with respect to antenna 1012 based on phase information in the reception results of the first corrected subcarriers for M terminal devices by N antennas.
The network device may determine array arrangement errors corresponding to the N antennas respectively according to the phase errors of the N-1 antennas except the reference antenna with respect to the reference antenna and the coordinates corresponding to the N antennas respectively. The coordinates corresponding to the N antennas may be preset, for example, the position of the reference antenna may be set as an initial coordinate, such as (0,0), and then the coordinates corresponding to the remaining N-1 antennas are obtained according to the array arrangement rule of the N antennas. Due to factors such as a manufacturing process, an error exists between the actual position of the antenna and the coordinates set for the N antennas by the network device, and the error is an array arrangement error.
Because the receiving results of the N antennas on the first corrected subcarriers of the M terminal devices may be affected by the array arrangement errors, the embodiments of the present application may determine the array arrangement errors corresponding to the N antennas through the phase error of the N-1 antennas relative to the reference antenna and the coordinates corresponding to the N antennas, respectively, so that when performing antenna correction, the influence of the array arrangement errors on the receiving results of the N antennas on the first corrected subcarriers of the M terminal devices may be reduced, which is beneficial to improving the antenna correction accuracy.
In a possible implementation manner, when the network device obtains array configuration errors corresponding to the N antennas, the angle normalization coefficient may be further considered to obtain the array configuration errors more accurately.
After the network device obtains the array configuration errors corresponding to the N antennas, the network device may determine an error coefficient of the reception result of the N antennas on the one or more corrected subcarriers of the M terminal devices according to the array configuration errors corresponding to the N antennas, respectively, and the reception result of the N antennas on the one or more corrected subcarriers of the M terminal devices. In specific implementation, the array arrangement error is calculated once for each corrected subcarrier, so as to improve the correction accuracy.
In a possible implementation manner, the angle normalization coefficient may be further considered, that is, the network device may determine the error coefficient of the reception result of the first corrected subcarrier of the M terminal devices by the N antennas according to the array arrangement error and the angle normalization coefficient respectively corresponding to the N antennas, and the reception result of the first corrected subcarrier of the M terminal devices by the N antennas. Thus, the network device may determine uplink correction parameters corresponding to the N antennas respectively according to the error coefficients of the reception results of the N antennas for the one or more syndrome subcarriers of the M terminal devices.
By adopting the method, the network equipment introduces the array arrangement error (and the angle normalization coefficient) when calculating the error coefficient, thereby reducing the influence of the array arrangement error and the uplink pilot signal AOA on the receiving result of the terminal equipment. When different antennas receive the uplink pilot signal of the same terminal device, the phase information and amplitude information of the first syndrome received by the different antennas are also affected by the preset BF weight of the antennas and the antenna receiving gain.
Based on this, in a possible implementation manner, when the network device determines the error coefficient of the first corrected subcarrier reception result of the M terminal devices by the N antennas according to the array arrangement error corresponding to each of the N antennas and the first corrected subcarrier reception result of the N antennas to the M terminal devices, the equivalent effective BF weights corresponding to each of the N antennas may be determined first according to the preset BF weight of the reference antenna, the array arrangement error corresponding to each of the N antennas, and the first corrected subcarrier reception result of the N antennas to the M terminal devices. And then, the network equipment determines error coefficients of the receiving results of the first corrected subcarriers of the M terminal equipment by the N antennas according to the equivalent effective BF weights respectively corresponding to the N antennas and the preset BF weights respectively corresponding to the N antennas.
Due to the influence of errors added by antenna receiving, the equivalent effective BF weight determined by the network device according to the receiving result of the first correction subcarriers of the M terminal devices is different from the preset BF weight configured for the N antennas by the network device. According to the embodiment of the application, the error coefficients of the receiving results of the first correction subcarriers of the M terminal devices by the N antennas are determined through the equivalent effective BF weights and the preset BF weights corresponding to the N antennas respectively, so that the influence of the preset BF weights on the receiving results of the first correction subcarriers of the terminal devices is eliminated, and the errors of the antenna receiving gain can be represented to a certain extent through the error coefficients.
The embodiment of the application also provides a method for determining the equivalent effective BF weight. In a possible implementation manner, the network device may determine BF weight errors corresponding to the N antennas respectively according to a preset BF weight of the reference antenna and array arrangement errors (and/or angle normalization factors) corresponding to the N antennas respectively, where the BF weight errors of the antennas are used to represent errors of an equivalently effective BF weight of the antennas relative to the preset BF weight of the reference antenna. And then, the network equipment determines actual effective BF weights respectively corresponding to the N antennas according to the BF weight errors respectively corresponding to the N antennas and the preset BF weight of the reference antenna.
To more specifically illustrate the embodiments of the present application, fig. 4 provides a flowchart of a possible antenna calibration method, as shown in fig. 4, wherein Rx1 is a receive path of antenna 1, Rx2 is a receive path of antenna 2, and Rx N is a receive path of antenna N, … …. Taking Rx1 as an example, fig. 4 reflects the following process:
s401: and N antennas of the network equipment receive the uplink signal sent by the terminal equipment.
S402: the network equipment performs Fourier transform on the received uplink signal to obtain a frequency domain expression form x of the uplink signal. And extracting and processing uplink data in the uplink signal. And acquiring pilot frequency parts (pilot frequency Rx1, pilot frequency Rx2, … … and pilot frequency RXN) of uplink signals received by the N antennas respectively. The pilot part may include the uplink pilot signals of one or more terminal devices among the M terminal devices at any time, for example, at time t1, the uplink pilot signals of terminal device 102, terminal device 103, and terminal device 104 in fig. 1 may be included at the same time, and at time t2, the uplink pilot signal of terminal device 102 in fig. 1 may be included only. In the embodiment of the present application, the uplink pilot signal includes, but is not limited to, a Sounding Reference Signal (SRS), a demodulation reference signal (DMRS), and the like.
S403: and acquiring the characteristic matrixes respectively corresponding to the K correction sub-carriers according to the uplink pilot signals of the M terminal devices. For a specific implementation process, reference may be made to the foregoing contents, which are not described in detail in this embodiment of the application.
S404: and acquiring an angle normalization coefficient.
S405: and respectively determining K error coefficients according to the characteristic matrix corresponding to the K correction subcarriers, the angle normalization coefficient and the preset BF weight values corresponding to the N antennas. And synthesizing the K error coefficients to obtain uplink correction coefficients corresponding to the N antennas respectively.
S406: and integrating the K error coefficients to determine uplink correction parameters respectively corresponding to the N antennas.
S407: and respectively correcting the N antennas by using the uplink correction coefficients corresponding to the N antennas.
S408: and updating the coordinates of the N antennas according to the array arrangement errors, and updating the preset BF weights corresponding to the N antennas respectively according to the uplink correction parameters.
With the above embodiments, correction of the antenna reception channel can be achieved. Based on this, the embodiment of the present application further provides a technical solution for correcting the transmission channel of the antenna.
In a possible implementation manner, the M terminal devices may perform reciprocal operation on the received downlink pilot signal sent by the network device. For example, in fig. 1, network device 101 may instruct terminal device 102, terminal device 103, and terminal device 104 to perform reciprocal operation processing on the received downlink pilot signal by sending instruction information to terminal device 102, terminal device 103, and terminal device 104. And after the terminal equipment performs reciprocal operation processing on the downlink pilot signal, the processed downlink pilot signal is used as an uplink pilot signal and sent to the network equipment.
In a time division multiplexing (TDD) system, a terminal device uses a subcarrier carrying a downlink pilot signal as a subcarrier carrying an uplink pilot signal, and sends the uplink pilot signal to a network device. For example, in fig. 1, a downlink pilot signal sent by the network device 101 and received by the terminal device 102 is carried on the subcarrier 1, and the terminal device 102 performs reciprocal operation on the downlink pilot signal to obtain an uplink pilot signal, and then sends the uplink pilot signal to the network device 101 on the subcarrier 1.
After receiving the uplink pilot signals sent by the M terminal devices, the network device may apply error coefficients of the reception results of one or more correction subcarriers of the M terminal devices according to the N antennas. For any corrected subcarrier, for example, subcarrier 1, the network device may determine the transmission result of subcarrier 1 of M terminal devices by N antennas according to the error coefficients of the reception results of subcarrier 1 of M terminal devices by N antennas and the downlink pilot signal transmitted on subcarrier 1.
For example, the downlink pilot signal carried by subcarrier 1, excluding interference from other factors, satisfies the following formula one:
xdl＝h*tbs*Sdl(formula one)
Wherein x isdlA downlink pilot signal sent by the network equipment and received by the terminal equipment, h is a channel frequency response, tbsError coefficients for the transmission results of N antennas to subcarriers 1 of M terminal devices, SdlA downlink pilot signal transmitted on subcarrier 1 determined for the network device.
The terminal device performs reciprocal operation processing on the downlink pilot signal carried on the subcarrier 1 to obtain an uplink pilot signal, which is shown in formula two:
Figure BDA0001850137990000111
wherein the content of the first and second substances,
Figure BDA0001850137990000112
the uplink pilot signal obtained by the terminal equipment.
The terminal device sends the uplink pilot signal shown in formula two to the network device 101 on the subcarrier 1, and the uplink pilot signal received by the network device on the subcarrier 1 satisfies the following formula three:
Figure BDA0001850137990000113
wherein x isulFor the uplink pilot signal received by the network equipment, rbsFor the error coefficients of the reception results of the N antennas for the subcarriers 1 of the M terminal devices, the following formula four may be determined according to the formula two and the formula three:
Figure BDA0001850137990000114
the network device may further determine error coefficients of transmission results of the N antennas to the subcarriers 1 of the M terminal devices according to the error coefficients of the reception results of the N antennas to the subcarriers 1 of the M terminal devices, the received uplink pilot signal carried on the subcarriers 1, and the downlink pilot signal carried on the subcarriers 1 and transmitted to one or more terminal devices. It can be understood that the error coefficients of the transmission results of the N antennas to the subcarrier 1 of the M terminal devices are for a whole formed by the M terminal devices, and when the network device transmits the downlink pilot signal on the subcarrier 1, the network device may transmit the downlink pilot signal only to one or more terminal devices in the M terminal devices.
Furthermore, the network device may determine downlink correction parameters corresponding to the N antennas respectively according to error coefficients of transmission results of the N antennas to one or more correction subcarriers of the M terminal devices.
Fig. 5 is a schematic flow chart of a downlink correction method provided in an embodiment of the present application, and as shown in fig. 5, the method mainly includes the following steps:
s501: the network equipment carries out inverse Fourier transform processing on the downlink pilot signal and sends the processed downlink pilot signal to the terminal equipment.
S502: and the terminal equipment receives the downlink pilot signal after the inverse Fourier transform processing, performs Fourier transform processing and acquires the downlink pilot signal sent by the network equipment.
S503: and the terminal equipment performs reciprocal operation processing on the downlink pilot signal.
S504: and the terminal equipment takes the downlink pilot signal subjected to reciprocal processing as an uplink pilot signal, and sends the uplink pilot signal to the network equipment after inverse Fourier transform processing.
S505: and the network equipment receives the uplink pilot signal after inverse Fourier transform sent by the terminal equipment, and performs Fourier transform processing to obtain the uplink pilot signal.
S506: the network device obtains, according to the received uplink pilot signal, the error coefficients of the reception results of the N antennas for the one or more syndrome subcarriers of the M terminal devices according to the foregoing embodiment, and further obtains the error coefficients of the transmission results of the N antennas for the one or more syndrome subcarriers of the M terminal devices, thereby obtaining downlink correction parameters corresponding to the N antennas, respectively.
S507: and correcting the sending channels of the N antennas according to the downlink correction parameters respectively corresponding to the N antennas.
Based on the same technical concept, as shown in fig. 6, for a schematic device provided in the embodiments of the present application, the device 1000 may be a network device, or may be a system on a chip or a chip, and may perform any one of the antenna calibration methods provided in the embodiments.
The apparatus 1000 includes at least one processor 1001, a transceiver 1002, and optionally a memory 1003. The processor 1001, the transceiver 1002, and the memory 1003 are connected by a communication bus.
Processor 1001 may be a general purpose Central Processing Unit (CPU), microprocessor, application specific ASIC, or one or more integrated circuits for controlling the execution of programs in accordance with the inventive arrangements.
The communication bus may include a path that transfers information between the devices.
The transceiver 1002, which is used for communication with other devices or a communication network, may be a communication interface, such as a wired interface or a wireless interface, or a wifi interface, or the transceiver comprises radio frequency circuitry.
The memory 1003 may be, but is not limited to, a ROM or other type of static storage device that can store static information and instructions, a RAM or other type of dynamic storage device that can store information and instructions, an EEPROM, a CD-ROM or other optical disk storage, optical disk storage (including compact disk, laser disk, optical disk, digital versatile disk, blu-ray disk, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. The memory 1003 may be a separate entity and is connected to the processor 1001 through a communication bus. The memory 1003 may also be integrated with the processor. The memory 1003 is used for storing program codes for implementing the present invention, and the processor 1001 controls the execution of the program codes. The processor 1001 is used to execute application program code stored in the memory 1003.
In particular implementations, processor 1001 may include one or more CPUs such as CPU0 and CPU1 of fig. 6 for one embodiment.
In particular implementations, apparatus 1000 may include multiple processors, such as processor 1001 and processor 1008 in fig. 6, for example, as an example. Each of these processors may be a single-Core (CPU) processor or a multi-Core (CPU) processor, where a processor may refer to one or more devices, circuits, and/or processing cores for processing data (e.g., computer program instructions).
It should be understood that the apparatus may be used to implement any one of the antenna calibration methods provided in the above embodiments, and the related features may be referred to above and will not be described herein again.
The present application may perform division of functional modules on the apparatus according to the above method example, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, the division of the modules in the present application is schematic, and is only a logical function division, and there may be another division manner in actual implementation. For example, in the case of dividing each functional module by corresponding functions, fig. 7 shows a schematic diagram of an antenna calibration apparatus, where the antenna calibration apparatus 1100 may be a network device or a system on a chip or a chip according to the embodiment of the present application, and the apparatus includes a determining unit 1101 and a processing unit 1102. Wherein:
a determining unit 1101, configured to determine one or more syndrome subcarriers of M terminal devices according to uplink pilot signals respectively sent by the M terminal devices and received by the N antennas; one or more correction subcarriers of the M terminal devices are obtained according to subcarriers carrying uplink pilot signals sent by the M terminal devices; wherein N is greater than 1 and M is greater than 1; a determining unit 1101, configured to determine, for the first syndrome subcarrier, a receiving result of the first syndrome subcarrier of the first terminal device by the N antennas according to the uplink pilot signal sent by the first terminal device, where the receiving result of the first syndrome subcarrier of the first terminal device by the N antennas includes amplitude information and phase information of the first syndrome subcarrier when the uplink pilot signal sent by the first terminal device is received by the N antennas respectively; the first terminal equipment is any one of the M terminal equipment; the first syndrome subcarrier is any subcarrier of one or more syndrome subcarriers; a processing unit 1102, configured to determine uplink correction parameters corresponding to the N antennas respectively according to the receiving result of the N antennas on one or more syndrome subcarriers of the M terminal devices.
In a possible implementation manner, the processing unit 1102 is specifically configured to: obtaining angle normalization coefficients corresponding to M terminal devices respectively according to the arrival angle AOA of the uplink pilot signal when the N antennas receive the uplink pilot signal sent by the M terminal devices respectively; and determining uplink correction parameters respectively corresponding to the N antennas according to the receiving result of the N antennas on one or more correction subcarriers of the M terminal devices and the angle normalization coefficients respectively corresponding to the M terminal devices.
In one possible implementation manner, the N antennas include a reference antenna; the processing unit 1102 is specifically configured to: for the first correction subcarrier, determining phase errors of N-1 antennas except the reference antenna in the N antennas relative to the reference antenna according to phase information in receiving results of the first correction subcarrier of the M terminal devices by the N antennas; determining array arrangement errors corresponding to the N antennas respectively according to the phase errors of the N-1 antennas relative to the reference antenna and the coordinates corresponding to the N antennas respectively; the network equipment determines error coefficients of the receiving results of the N antennas to the first corrected subcarriers of the M terminal equipment according to array arrangement errors corresponding to the N antennas respectively and the receiving results of the N antennas to the first corrected subcarriers of the M terminal equipment; and determining uplink correction parameters corresponding to the N antennas respectively according to the error coefficients of the receiving results of the N antennas to one or more correction subcarriers of the M terminal devices.
In a possible implementation manner, the processing unit 1102 is specifically configured to: determining equivalent effective BF weights respectively corresponding to the N antennas according to a preset beam forming BF weight of the reference antenna, array arrangement errors respectively corresponding to the N antennas and receiving results of the N antennas on first correction subcarriers of the M terminal devices; and determining error coefficients of receiving results of the first corrected subcarriers of the M terminal devices by the N antennas according to equivalent effective BF weights respectively corresponding to the N antennas and preset BF weights respectively corresponding to the N antennas.
In a possible implementation manner, the processing unit 1102 is specifically configured to: determining BF weight errors corresponding to the N antennas respectively according to a preset BF weight of the reference antenna and array arrangement errors corresponding to the N antennas respectively; the BF weight error of the antenna is used for representing the error of the equivalent effective BF weight of the antenna relative to the preset BF weight of the reference antenna; and determining equivalent effective BF weights corresponding to the N antennas respectively according to the BF weight errors corresponding to the N antennas respectively and the preset BF weight of the reference antenna.
In a possible implementation manner, the uplink pilot signal sent by the first terminal device is obtained after the first terminal device performs reciprocal operation on the received downlink pilot signal; the uplink pilot signal and the downlink pilot signal are carried on the same correction sub-carrier; the processing unit 1102 is further configured to: for the first correction subcarrier, determining the error coefficient of the transmission result of the first correction subcarrier of the M terminal devices by the N antennas according to the error coefficient of the reception result of the first correction subcarrier of the M terminal devices by the N antennas and the downlink pilot signal carried by the first subcarrier; and determining downlink correction parameters respectively corresponding to the N antennas according to the error coefficients of the results sent by the N antennas to one or more correction subcarriers of the M terminal devices.
Based on the same technical concept, embodiments of the present application further provide a computer-readable storage medium, in which computer instructions are stored, and when the instructions are executed on a computer, the computer is caused to execute any one of the above method embodiments.
Based on the same technical concept, the embodiments of the present application also provide a computer program product containing instructions, which when run on a computer, cause the computer to perform the method embodiments described in the above aspects.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website site, computer, server, or data center to another website site, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. A single processor or other unit may fulfill the functions of several items recited in the claims. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, apparatus (device), computer-readable storage medium, or computer program product. Accordingly, this application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects that may all generally be referred to herein as a "module" or "system.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices) and computer program products 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 invention has been described in conjunction with specific features and embodiments thereof, it will be evident that various modifications and combinations can be made thereto without departing from the spirit and scope of the invention. Accordingly, the specification and figures are merely exemplary of the invention as defined in the appended claims and are intended to cover any and all modifications, variations, combinations, or equivalents within the scope of the invention. It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (10)

1. An antenna calibration method, comprising:
the network equipment determines one or more syndrome sub-carriers of the M pieces of terminal equipment according to uplink pilot signals respectively sent by the M pieces of terminal equipment and received by the N pieces of antennas of the network equipment; one or more correction subcarriers of the M terminal devices are obtained according to subcarriers carrying uplink pilot signals sent by the M terminal devices; wherein N is greater than 1 and M is greater than 1;
for a first syndrome subcarrier, the network device determines, according to an uplink pilot signal sent by a first terminal device, a reception result of the first syndrome subcarrier of the first terminal device by the N antennas, where the reception result of the first syndrome subcarrier of the first terminal device by the N antennas includes amplitude information and phase information of the first syndrome subcarrier when the uplink pilot signal sent by the first terminal device is received by the N antennas respectively; the first terminal equipment is any one of the M terminal equipment; the first syndrome subcarrier is any one of the one or more syndrome subcarriers;
the network equipment determines uplink correction parameters corresponding to the N antennas respectively according to the receiving results of the N antennas on one or more correction subcarriers of the M terminal equipment;
the N antennas comprise reference antennas;
the network device determines uplink correction parameters corresponding to the N antennas respectively according to the receiving result of the N antennas on one or more syndrome subcarriers of the M terminal devices, including:
for the first syndrome subcarrier, the network device determines phase errors of N-1 antennas except the reference antenna in the N antennas respectively relative to the reference antenna according to phase information in a reception result of the N antennas on the first syndrome subcarrier of the M terminal devices; the network equipment determines array arrangement errors corresponding to the N antennas respectively according to the phase errors of the N-1 antennas relative to the reference antenna and the coordinates corresponding to the N antennas respectively; the network equipment determines error coefficients of receiving results of the N antennas on the first corrected subcarriers of the M terminal equipment according to array arrangement errors corresponding to the N antennas respectively and receiving results of the N antennas on the first corrected subcarriers of the M terminal equipment;
and determining uplink correction parameters corresponding to the N antennas respectively according to the error coefficients of the receiving results of the N antennas on one or more correction subcarriers of the M terminal devices.
2. The method as claimed in claim 1, wherein the determining, by the network device, the uplink correction parameters respectively corresponding to the N antennas according to the receiving result of the N antennas on one or more syndrome subcarriers of the M terminal devices includes:
the network equipment obtains angle normalization coefficients corresponding to the M terminal equipment respectively according to the arrival angle AOA of the uplink pilot signal when the network equipment receives the uplink pilot signals respectively sent by the M terminal equipment through the N antennas;
and the network equipment determines uplink correction parameters respectively corresponding to the N antennas according to the receiving result of the N antennas on one or more correction subcarriers of the M terminal equipment and the angle normalization coefficients respectively corresponding to the M terminal equipment.
3. The method as claimed in claim 1, wherein the determining, by the network device, the error coefficients of the reception results of the N antennas for the first corrected subcarriers of the M terminal devices according to the array arrangement errors corresponding to the N antennas respectively and the reception results of the N antennas for the first corrected subcarriers of the M terminal devices, comprises:
the network equipment determines equivalent effective BF weights corresponding to the N antennas respectively according to a preset beam forming BF weight of the reference antenna, array arrangement errors corresponding to the N antennas respectively and a receiving result of the N antennas on first correction subcarriers of the M terminal devices;
and the network equipment determines error coefficients of the receiving results of the first correction subcarriers of the M terminal equipment by the N antennas according to the equivalent effective BF weights respectively corresponding to the N antennas and the preset BF weights respectively corresponding to the N antennas.
4. The method of claim 1, wherein the uplink pilot signal sent by the first terminal device is obtained by performing reciprocal operation on a received downlink pilot signal sent by the network device by the first terminal device; the uplink pilot signal and the downlink pilot signal are carried on the same correction sub-carrier;
after the network device determines the error coefficients of the reception results of the N antennas for the first subcarriers of the M terminal devices, the method further includes:
for the first syndrome, the network device determines, according to the error coefficients of the reception results of the first syndrome of the M terminal devices by the N antennas and the downlink pilot signals carried on the first syndrome, the error coefficients of the transmission results of the first syndrome of the M terminal devices by the N antennas;
and the network equipment determines downlink correction parameters respectively corresponding to the N antennas according to the error coefficients of the results sent by the N antennas to one or more correction subcarriers of the M terminal equipment.
5. An antenna calibration device, comprising: a determination unit and a processing unit;
the determining unit is configured to determine one or more syndrome subcarriers of M terminal devices according to uplink pilot signals received by the N antennas and respectively sent by the M terminal devices; one or more correction subcarriers of the M terminal devices are obtained according to subcarriers carrying uplink pilot signals sent by the M terminal devices; wherein N is greater than 1 and M is greater than 1;
the determining unit is further configured to determine, for a first syndrome subcarrier, a reception result of the first syndrome subcarrier of the first terminal device by the N antennas according to an uplink pilot signal sent by the first terminal device, where the reception result of the first syndrome subcarrier of the first terminal device by the N antennas includes amplitude information and phase information of the first syndrome subcarrier when the uplink pilot signal sent by the first terminal device is received by the N antennas respectively; the first terminal equipment is any one of the M terminal equipment; the first syndrome subcarrier is any one of the one or more syndrome subcarriers;
the processing unit is configured to determine uplink correction parameters corresponding to the N antennas respectively according to a reception result of the N antennas on one or more syndrome subcarriers of the M terminal devices;
the N antennas comprise reference antennas; the processing unit is specifically configured to:
for the first corrected subcarrier, determining phase errors of N-1 antennas except the reference antenna in the N antennas relative to the reference antenna according to phase information in receiving results of the N antennas on the first corrected subcarrier of the M terminal devices; determining array arrangement errors corresponding to the N antennas respectively according to the phase errors of the N-1 antennas relative to the reference antenna and the coordinates corresponding to the N antennas respectively; determining error coefficients of the receiving results of the N antennas to the first corrected subcarriers of the M terminal devices according to the array arrangement errors corresponding to the N antennas respectively and the receiving results of the N antennas to the first corrected subcarriers of the M terminal devices; and determining uplink correction parameters corresponding to the N antennas respectively according to the error coefficients of the receiving results of the N antennas on one or more correction subcarriers of the M terminal devices.
6. The apparatus as claimed in claim 5, wherein said processing unit is specifically configured to:
obtaining angle normalization coefficients corresponding to the M terminal devices respectively according to the arrival angle AOA of the uplink pilot signal when the N antennas receive the uplink pilot signal sent by the M terminal devices respectively; and determining uplink correction parameters respectively corresponding to the N antennas according to the receiving result of the N antennas on one or more correction subcarriers of the M terminal devices and the angle normalization coefficients respectively corresponding to the M terminal devices.
7. The apparatus as claimed in claim 6, wherein said processing unit is specifically configured to:
determining equivalent effective BF weights corresponding to the N antennas respectively according to a preset beam forming BF weight of the reference antenna, array arrangement errors corresponding to the N antennas respectively and a receiving result of the N antennas on first correction subcarriers of the M terminal devices; and determining error coefficients of the receiving results of the first corrected subcarriers of the M terminal devices by the N antennas according to equivalent effective BF weights respectively corresponding to the N antennas and preset BF weights respectively corresponding to the N antennas.
8. The apparatus of claim 6, wherein the uplink pilot signal sent by the first terminal device is obtained by the first terminal device performing reciprocal operation on the received downlink pilot signal; the uplink pilot signal and the downlink pilot signal are carried on the same correction sub-carrier;
the processing unit is further to:
for the first syndrome, determining error coefficients of the transmission results of the N antennas to the first syndrome of the M terminal devices according to error coefficients of the reception results of the N antennas to the first syndrome of the M terminal devices and downlink pilot signals carried on the first syndrome;
and determining downlink correction parameters respectively corresponding to the N antennas according to the error coefficients of the results of the N antennas sent to one or more correction subcarriers of the M terminal devices.
9. An antenna calibration device, comprising: a processor and a memory;
the memory to store program instructions;
the processor, configured to perform the method of any one of claims 1 to 4 by invoking program instructions stored by the memory.
10. 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 to 4.
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