A channel correction method and apparatus

Abstract

This invention discloses a channel calibration method and apparatus. The channel calibration method is used to perform channel calibration on L radio frequency (RF) devices, where the L RF devices are L groups of level 0 RF devices, L ≥ 4 and is a positive integer; let N = L, k = 1; the channel calibration method includes: dividing the N groups of k-1 level RF devices into M groups of k level RF devices; each of the M groups of k level RF devices includes one or two groups of k-1 level RF devices, and at most one group of k level RF devices includes one group of k-1 level RF devices; for each group containing two groups of k-1 level RF devices, channel calibration is performed between the two groups of k-1 level RF devices; let k = k + 1, N = M; repeating the channel calibration method until channel calibration is completed between the L RF devices. During the calibration process, multiple groups of new RF devices can be calibrated simultaneously, significantly improving calibration efficiency for large-scale calibrations.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and more particularly to a channel correction method and apparatus. Background Technology

[0002] For Time-Division Duplex (TDD) systems, a major advantage is that the uplink and downlink air interface channels can be considered reciprocal. This allows the channel response of the corresponding downlink channel to be obtained through the Sounding Reference Signal (SRS), and further non-codebook precoding of the Physical Downlink Shared Channel (PDSCH) can be performed, greatly improving the performance of the TDD system.

[0003] Typical TDD systems include Distributed Multiple-input Multiple-Output (DMIMO) systems. In a DMIMO system, radio frequency (RF) devices are deployed separately, and multiple overlapping RF devices can form a group, with the RF devices within the group jointly transmitting to the terminal.

[0004] In the TDD system described above, various factors such as hardware and environment can limit the use of channel reciprocity between radio frequency (RF) devices or base stations (also referred to as RF devices, hereinafter collectively referred to as RF devices). Therefore, it is necessary to calibrate the channels between RF devices to ensure the use of channel reciprocity. Currently, a commonly used calibration method is to perform mutual calibration between RF devices sequentially. For example, if there are four RF devices, RF device 1 is calibrated with RF device 2, RF device 2 with RF device 3, and RF device 3 with RF device 4. If there are N RF devices and the calibration time for each calibration is T, then completing the calibration requires (N-1)*T, which is time-consuming and cannot meet practical application requirements. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a channel calibration method and apparatus. By calibrating the radio frequency devices that need calibration in groups, and allowing each group to complete calibration simultaneously, the method provided in this application significantly saves calibration time and improves calibration efficiency compared to the prior art which calibrates sequentially and uses calibrated radio frequency devices to calibrate uncalibrated devices.

[0006] A first aspect of the present invention provides a channel correction method, characterized in that the channel correction method is used to perform channel correction on L radio frequency devices, wherein the L radio frequency devices are L groups of 0-level radio frequency devices, L≥4, and L is a positive integer; let N=L, k=1; the channel correction method includes: dividing the N groups of k-1-level radio frequency devices into M groups of k-level radio frequency devices, wherein M, N, and k are positive integers, M≥1, N>M; in the M groups of k-level radio frequency devices, each group of k-level radio frequency devices includes one or two groups of k-1-level radio frequency devices, and at most one group of k-level radio frequency devices includes one group of k-1-level radio frequency devices; wherein each group of k-1-level radio frequency devices includes at least one radio frequency device; for each group of k-level radio frequency devices containing two groups of k-1-level radio frequency devices, channel correction is performed between the two groups of k-1-level radio frequency devices; let k=k+1, N=M; repeat the channel correction method until channel correction is completed between the L radio frequency devices.

[0007] This channel calibration method regroups the previous RF device group for calibration during the calibration process. Multiple groups of each new RF device group can be calibrated simultaneously. Compared with calibrating sequentially, this method saves a lot of time. In particular, for the calibration of large-scale RF devices, the calibration efficiency will be significantly improved.

[0008] In one optional implementation, the M k-level RF device groups include a first k-level RF device group and a second k-level RF device group. Specifically, if the first k-level RF device group includes a first k-1 level RF device group and a second k-1 level RF device group, and the second k-level RF device group includes a third k-1 level RF device group and a fourth k-1 level RF device group, then for each k-level RF device group containing two k-1 level RF device groups, channel correction between the two k-1 level RF device groups includes: simultaneously performing channel correction on the first k-1 level RF device group and the second k-1 level RF device group, and simultaneously performing channel correction on the third k-1 level RF device group and the fourth k-1 level RF device group. By performing correction simultaneously on multiple groups among the M k-level RF device groups, the parallelism of the correction process is improved, thus increasing the efficiency of the correction.

[0009] In one optional implementation, the channel calibration of the first k-1 level RF device group and the second k-1 level RF device group includes: when the first k-1 level RF device group and the second k-1 level RF device group include at least three RF devices, selecting a first RF device from the first k-1 level RF device group and a second RF device from the second k-1 level RF device group, and performing channel calibration between the first RF device and the second RF device; wherein the first RF device and the second RF device are the two RF devices closest to each other in all calibration combinations; the calibration combination consists of arbitrarily selecting one RF device from the first k-1 level RF device group and arbitrarily selecting one RF device from the second k-1 level RF device group. This method, in the calibration process, only requires selecting one RF device from each k-1 level RF device group for channel calibration, which reduces the difficulty of calibration, and by selecting adjacent RF devices for channel calibration, it improves the accuracy of channel calibration.

[0010] In one optional implementation, selecting a first radio frequency device from the first k-1 level radio frequency device group and selecting a second radio frequency device from the second k-1 level radio frequency device group includes: determining the radio frequency devices in the closest correction combination as the first radio frequency device and the second radio frequency device based on the distance between the two radio frequency devices in each correction combination; or determining the radio frequency devices in the correction combination with the largest RSRP as the first radio frequency device and the second radio frequency device based on the reference signal received power (RSRP) between the two radio frequency devices in each correction combination.

[0011] In one optional implementation, the channel correction between the first radio frequency device and the second radio frequency device includes: determining a first correction coefficient for the first radio frequency device relative to the second radio frequency device; and performing channel correction on the first radio frequency device according to the first correction coefficient, such that the antennas of the first radio frequency device and the second radio frequency device have the same transmit / receive ratio.

[0012] In an alternative implementation, after determining the first correction coefficient of the first radio frequency device relative to the second radio frequency device, the method further includes: performing channel correction on other radio frequency devices in the first k-1 level radio frequency device group based on the first correction coefficient.

[0013] In one optional implementation, determining the first correction coefficient of the first radio frequency device relative to the second radio frequency device includes: the first radio frequency device sending a first correction signal to the second radio frequency device through a first channel, and receiving a second correction signal sent by the second radio frequency device to the first radio frequency device through the first channel; the first radio frequency device performing channel estimation based on the second correction signal to determine a first channel estimation result; the first radio frequency device receiving a second channel estimation result obtained by the second radio frequency device performing channel estimation based on the first correction signal; and the first radio frequency device determining the first correction coefficient based on the first channel estimation result and the second channel estimation result.

[0014] A second aspect of the present invention provides a channel correction device, characterized in that the channel correction device is used to perform channel correction on L radio frequency devices, wherein the L radio frequency devices are L groups of 0-level radio frequency devices, L≥4, and L is a positive integer; let N=L, k=1; the channel correction device includes an allocation unit, a correction unit, and a control unit; the allocation unit is used to divide the N groups of k-1-level radio frequency devices into M groups of k-level radio frequency devices, wherein M, N, and k are positive integers, M≥1, N>M; each of the M groups of k-level radio frequency devices includes 1 There are one or two k-1 level RF device groups, and at most one k-1 level RF device group includes one k-1 level RF device group; wherein, the k-1 level RF device group includes at least one RF device; the correction unit is used to perform channel correction between the two k-1 level RF device groups for each group containing two k-1 level RF device groups; the control unit is used to determine whether channel correction has been completed between L RF devices, and if correction has not been completed between L RF devices, then let k = k + 1, N = M; and control the allocation unit and the correction unit to perform allocation and correction.

[0015] A third aspect of the present invention provides a computer-readable storage medium, characterized in that the storage medium stores a computer program, wherein the computer program is configured to execute the method described above when run.

[0016] A fourth aspect of the present invention provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, when the processor executes the computer program, it implements the method described above. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of a distributed large-scale multiple-input multiple-output array scenario in an embodiment of this application.

[0018] Figure 2This is a flowchart of a channel correction method between radio frequency devices according to an embodiment of the present invention.

[0019] Figure 3 This is a flowchart illustrating the channel calibration process of two radio frequency devices in an embodiment of the present invention.

[0020] Figure 4 This is a flowchart of channel correction in another embodiment of this application.

[0021] Figure 5 This is a flowchart of channel correction in yet another embodiment of this application.

[0022] Figure 6 This is a schematic diagram illustrating channel calibration between radio frequency devices when the number of radio frequency devices in this application is 5.

[0023] Figure 7 This is a schematic diagram illustrating channel calibration between radio frequency devices when the number of radio frequency devices in this application is 6.

[0024] Figure 8 This is a schematic diagram illustrating channel calibration between radio frequency devices when the number of radio frequency devices in this application is 7.

[0025] Figure 9 This is a schematic diagram illustrating channel calibration between radio frequency devices when the number of radio frequency devices in this application is 8.

[0026] Figure 10 This is a schematic diagram of the channel correction device in this application.

[0027] Figure 11 for Figure 10 A schematic diagram of the intermediate correction unit.

[0028] Figure 12 This is a schematic diagram of the structure of a base station provided in an embodiment of this application. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0030] The technical solution in this invention uses a base station, also known as a Radio Access Network (RAN) device, which is a device that connects a terminal to a wireless network. Base stations include, but are not limited to: base stations (BTS) in Global System for Mobile Communications (GSM) or Code Division Multiple Access (CDMA) systems, base stations (NodeBs) in Wideband Code Division Multiple Access (WCDMA) systems, evolved Node Bs (eNBs or e-NodeBs) in Long Term Evolution (LTE), next-generation evolved Node Bs (ng-eNBs), generation Node Bs (gNBs or g-NodeBs) in 5G communication systems, base station controllers (BSCs), base transceiver stations (BTSs), home evolved node Bs (HeNBs), and base band units (BBs). Unit (abbreviated as BBU), Transmitting and Receiving Point (abbreviated as TRP), etc., are not limited in this invention.

[0031] It should be understood that the radio frequency devices in the embodiments of the present invention include base stations that need to perform channel correction on each other, and also include radio remote units (RRUs) in radio remote mode. That is to say, the channel correction between radio frequency devices in the embodiments of the present invention includes channel correction between base stations and channel correction between RRUs.

[0032] Please refer to Figure 1 As shown, Figure 1 This is a schematic diagram of a distributed large-scale multiple-input multiple-output array scenario in an embodiment of this application. Figure 1In the diagram, radio frequency (RF) devices 101, 102, and 103 have overlapping coverage areas, and terminal 104 is located within this overlapping coverage area. In a DMIMO scenario, RF devices 101, 102, and 103 form a group, and the RF devices within this group jointly transmit signals to terminal 104 within the overlapping coverage area. The prerequisite for joint transmission within the group is that the channels of each RF device have the same amplitude and phase, ensuring that the signals transmitted by each RF device are added in phase when they reach the terminal, thus enhancing the downlink signal reception strength. In practical applications, because the RF devices within the group use different transmitting and receiving circuits, it is difficult to ensure that the characteristics of the transmitting and receiving circuits are consistent, and the environments in which each RF device operates also differ, leading to certain errors in the amplitude and phase of each antenna. Therefore, channel calibration between the various RF devices becomes particularly important.

[0033] Please refer to Figure 2 As shown, Figure 2 This is a flowchart of a channel correction method between radio frequency devices according to an embodiment of the present invention. The channel correction method includes step 201, dividing N k-1 level radio frequency device groups into M k-level radio frequency device groups, wherein each of the M k-level radio frequency device groups includes one or two k-1 level radio frequency device groups, and at most one k-level radio frequency device group includes one k-1 level radio frequency device group; wherein each k-1 level radio frequency device group includes at least one radio frequency device. In embodiments of the present invention, M, N, and k are all positive integers, M≥1, N>M, and k≥1.

[0034] The purpose of implementing 201 is to group the k-1 level RF device groups in pairs as much as possible. If the number of k-1 level RF device groups is odd, there will be an extra RF device group that cannot be paired with other RF device groups, and it will be treated as a separate k-level RF device group.

[0035] When grouping, for two k-1 level RF device groups within the same k-level RF device group, one RF device is randomly selected from each of the two k-1 level RF device groups to form a calibration combination. At least one calibration combination must satisfy the calibration conditions. Satisfying the calibration conditions means that the two RF devices in the calibration combination can see each other, that is, they can receive each other's signals. It is understood that when grouping, two k-1 level RF device groups that are physically close should be grouped into the same k-level RF device group.

[0036] Based on the above constraints, both N and M are positive integers, and the following relationship exists between N and M: in, This indicates rounding up; when N is even, When N is odd

[0037] 202. For each group containing two k-1 level RF device groups, channel calibration is performed between the two k-1 level RF device groups.

[0038] In one optional embodiment, for each group containing two k-1 level RF device groups, multiple groups of k-1 level RF device groups simultaneously perform channel correction between the two k-1 level RF device groups. The multiple groups of k-1 level RF device groups can be all k-1 level RF device groups containing two k-1 level RF device groups, or they can be some of the k-1 level RF device groups containing two k-1 level RF device groups. This application does not limit the requirement that all k-1 level RF device groups containing two k-1 level RF device groups must perform channel correction simultaneously.

[0039] The channel calibration method provided in this embodiment of the invention allows for the calibration of radio frequency devices in groups, enabling simultaneous calibration of multiple groups. This significantly saves time compared to calibrating sequentially, and the calibration efficiency is particularly improved for calibrating large-scale radio frequency devices.

[0040] In one embodiment, when performing channel calibration between two k-1 level RF device groups, one RF device is selected from each of the two k-1 level RF device groups for channel calibration. Assuming the k-level RF device group includes a first k-level RF device group, and the first k-level RF device group includes a first k-1 level RF device group and a second k-1 level RF device group, when both the first and second k-1 level RF device groups contain at least three RF devices, a first RF device is selected from the first k-1 level RF device group, and a second RF device is selected from the second k-1 level RF device group. Channel calibration is then performed between the first and second RF devices. Of course, when both the k-1 level RF device group and the second k-1 level RF device group contain two RF devices, no selection is required, and channel calibration is performed directly between these two RF devices.

[0041] When performing channel calibration on the first radio frequency device and the second radio frequency device, a first calibration coefficient is determined for the first radio frequency device relative to the second radio frequency device. Channel calibration is then performed on the first radio frequency device based on the first calibration coefficient, ensuring that the antennas of the first and second radio frequency devices have the same transmit / receive ratio. During channel calibration of the first radio frequency device based on the first calibration coefficient, the antenna calibration coefficient of the first radio frequency device is adjusted by multiplying it by a first coefficient, ensuring that the antennas in the first and second radio frequency devices have the same transmit / receive ratio.

[0042] The above describes channel calibration for the first radio frequency (RF) device. Channel calibration can also be performed on the second RF device. When performing channel calibration on the first and second RF devices, a second calibration coefficient is determined relative to the first RF device. Channel calibration is then performed on the second RF device based on this second calibration coefficient, ensuring that the antennas of the second and first RF devices have the same transmit / receive ratio. Furthermore, when performing channel calibration on the second RF device based on the second calibration coefficient, the antenna calibration coefficient of the second RF device is adjusted by multiplying it by the second coefficient, ensuring that the antennas in both the first and second RF devices have the same transmit / receive ratio.

[0043] After the channel calibration of the first and second radio frequency devices is completed, if the first radio frequency device is calibrated according to the first calibration coefficient, then the other radio frequency devices in the first k-1 level radio frequency device group are also calibrated according to the first calibration coefficient. If the antenna calibration coefficient of the first radio frequency device is adjusted by multiplying it by the first coefficient, then the other radio frequency devices in the first k-1 level radio frequency device group are also adjusted by multiplying it by the first coefficient. If the second radio frequency device is calibrated according to the second calibration coefficient, then the other radio frequency devices in the second k-1 level radio frequency device group are also calibrated according to the second calibration coefficient. If the antenna calibration coefficient of the second radio frequency device is adjusted by multiplying it by the second coefficient, then the other radio frequency devices in the second k-1 level radio frequency device group are also adjusted by multiplying it by the second coefficient, thereby completing the channel calibration between the first k-1 level radio frequency device group and the second k-1 level radio frequency device group. Of course, in this embodiment, the order in which the antenna correction coefficients of the radio frequency devices in the first k-1 level radio frequency device group are adjusted is not limited. The antenna correction coefficients of the first radio frequency device can be adjusted first, followed by adjustments to the antenna correction coefficients of the other radio frequency devices in the first k-1 level radio frequency device group; alternatively, the antenna correction coefficients of both the first radio frequency device group and the other radio frequency devices in the first k-1 level radio frequency device group can be adjusted simultaneously. Similarly, in this embodiment, the order in which the antenna correction coefficients of the radio frequency devices in the second k-1 level radio frequency device group are adjusted is not limited. The antenna correction coefficients of the second radio frequency device can be adjusted first, followed by adjustments to the antenna correction coefficients of the other radio frequency devices in the second k-1 level radio frequency device group; alternatively, the antenna correction coefficients of both the second radio frequency device group and the other radio frequency devices in the second k-1 level radio frequency device group can be adjusted simultaneously.

[0044] When selecting the first and second radio frequency (RF) devices, it is sufficient that the first and second RF devices can see each other, meaning they can receive each other's signals. In some alternative schemes, an RF device is randomly selected from the first k-1 level RF device group and another RF device is randomly selected from the second k-1 level RF device group to form a calibration combination. The first and second RF devices are the two closest RF devices among all calibration combinations. Assuming the first k-1 level RF device group includes two RF devices, RF device 1 and RF device 2, and the second k-1 level RF device group also includes two RF devices, RF device 3 and RF device 4, an RF device is selected from the first k-1 level RF device group and another from the second k-1 level RF device group. The distances between each combination are shown in Table 1.

[0045]

[0046] Table 1

[0047] If it is queried that d1 < d2 < d3 < d4, it is considered that the radio frequency device 1 is selected as the first radio frequency device and the radio frequency device 3 is selected as the second radio frequency device, and channel calibration is performed between the radio frequency device 1 and the radio frequency device 3. When channel calibration is performed between the two radio frequency devices with the shortest distance, the signal intensities of the calibration signals sent by each other received by the two radio frequency devices are relatively large, and the calibration effect is better.

[0048] In the above embodiments, the radio frequency devices for channel calibration are selected based on the distances between the respective radio frequency devices. In the control device, the static distances between the respective radio frequency devices during installation are stored. Of course, the radio frequency devices for channel calibration can also be selected based on the signal intensity. By transmitting signals between two radio frequency devices, the signal intensity is obtained. For example, if the radio frequency device 1 transmits a signal and the radio frequency device 2 receives the signal, the greater the signal intensity, the better the communication performance between the two radio frequency devices. The distance between the two radio frequency devices can also be dynamically obtained by this method. The greater the signal intensity, the shorter the distance between the two radio frequency devices can be considered. This signal intensity can be the Reference Signal Received Power (RSRP for short). Still taking the above embodiments as an example, assume that the first k-1 level radio frequency device group includes 2 radio frequency devices, the radio frequency device 1 and the radio frequency device 2, and the second k-1 level radio frequency device group also includes 2 radio frequency devices, the radio frequency device 3 and the radio frequency device 4. Select one radio frequency device from the first k-1 level radio frequency device group, select one radio frequency device from the second k-1 level radio frequency device group, and query the signal intensities between each combination as shown in Table 2.

[0049]

[0050] Table 2

[0051] If it is queried that RSRP1 > RSRP2 > RSRP3 > RSRP4, it is considered that the distance between the radio frequency device 1 and the radio frequency device 3 is the shortest. Select the radio frequency device 1 as the first radio frequency device and the radio frequency device 3 as the second radio frequency device, and perform channel calibration between the radio frequency device 1 and the radio frequency device 3.

[0052] The k-level RF device group also includes a second k-level RF device group, which in turn contains a third k-1 RF device group and a fourth k-1 RF device group. When channel correction is performed between the first and second k-1 RF device groups, channel correction is also performed simultaneously between the third and fourth k-1 RF device groups. Understandably, to reduce interference, the correction signals between the first and second k-1 RF device groups, and between the third and fourth k-1 RF device groups, are simultaneously corrected using frequency division or code division. For example, in an OFDM system, orthogonality can be achieved through different subcarriers, different orthogonal codes, or sequences with autocorrelation properties (such as Zadoff-Chu sequences, Frank sequences, Golomb polyphase sequences, Chirp sequences, etc.) using different cyclic shifts, among other methods. If the second k-level RF device group contains only the third k-1 level RF device group, then during channel calibration between the first k-1 level RF device group and the second k-1 level RF device group, the RF devices in the third k-1 level RF device group will not undergo channel calibration with the RF devices in other k-1 RF device groups. After channel calibration is completed between the first k-1 level RF device group and the second k-1 level RF device group, the corresponding calibration coefficient will be obtained. Other RF devices in the first k-1 level RF device group or the second k-1 level RF device group that did not participate in calibration can directly complete channel calibration based on this calibration coefficient. The third k-1 level RF device group and the fourth k-1 level RF device group can complete the channel calibration of other RF devices within the group in the same way.

[0053] In the above embodiments, when performing channel calibration between two k-1 level RF device groups, it is sufficient to select one RF device from each of the two k-1 level RF device groups, and the selected two RF devices can perform channel calibration, thus completing the channel calibration between the two k-1 level RF device groups.

[0054] In an alternative implementation, instead of pre-storing the distances or signal strengths between the RF devices in each correction combination, the correction combination is selected based on the actual situation when correction is needed. For example, the two RF devices with the shortest distance or the strongest signal strength are selected. Specifically, from the RF devices in the second k-1 level RF device group, the RF device with the strongest correction signal is selected as the second RF device, and channel correction is performed between the first and second RF devices. In this embodiment, there may be a situation where the correction signal sent by the selected first RF device cannot be received by any of the RF devices in the second k-1 level RF device group. In this case, a new RF device can be selected from the first k-1 level RF device group as the first RF device, and the above process can be repeated to ultimately achieve the purpose of mutual correction.

[0055] Of course, in an alternative implementation, the distance between RF devices or the RSRP signal strength can be disregarded during calibration. For example, arbitrarily select one RF device from the first k-1 level RF device group as the first RF device to send the calibration signal, and all RF devices in the second k-1 level RF device group will receive the calibration signal, as long as the RF devices can communicate with each other.

[0056] In one embodiment, if there are L radio frequency devices that need to be mutually calibrated, where L≥4, then the range of values ​​for k is: Where k is a positive integer, This indicates rounding up. Therefore, for L RF devices, in the optimal case, i.e., during each calibration, for all k-level RF device groups containing two k-1 level RF device groups within each group, channel calibration is simultaneously performed between the two k-1 level RF device groups. In this case, only... In one calibration cycle, channel calibration between L RF devices can be completed, while the sequential calibration scheme in related technologies requires (L-1) calibration cycles to complete the channel calibration between L RF devices. In an optional implementation, for all k-level RF device groups containing two k-1 level RF device groups within each group, only a portion of the k-level RF device groups can be selected for simultaneous channel calibration between the two k-1 level RF device groups; although this method increases the calibration time compared to the optimal case, it is still less than the time required in related technologies. Therefore, the scheme in this application embodiment greatly improves the efficiency of channel calibration, and the efficiency improvement will be more significant as the number of RF devices to be calibrated increases.

[0057] Please refer to Figure 3The diagram shows a flowchart illustrating channel calibration performed by two radio frequency (RF) devices within a calibration cycle in an embodiment of the present invention. It includes steps 301: A first RF device sends a first calibration signal to a second RF device through a first channel and receives a second calibration signal sent by the second RF device to the first RF device through the first channel. It is understood that the first RF device may send the first calibration signal first and then receive the second calibration signal; conversely, the first RF device may receive the second calibration signal first and then send the first calibration signal. There is no sequential constraint between the first RF device sending the first calibration signal to the second RF device and receiving the second calibration signal from the second RF device. Step 302: The first RF device performs channel estimation based on the second calibration signal to determine a first channel estimation result. Step 303: The first RF device receives the second channel estimation result obtained by the second RF device based on the first calibration signal. Step 304: The first RF device performs channel calibration based on the first and second channel estimation results. During channel calibration, the first RF device determines a first calibration coefficient relative to the second RF device based on the first and second channel estimation results.

[0058] Those skilled in the art will understand that these correction signals can be the same signal. Although the distinction between the first and second correction signals is made above, it is mainly to differentiate that the correction signals are sent by different radio frequency devices, not to indicate that the correction signals themselves are different signals. Of course, the correction signals themselves can also be different, but this would incur additional system overhead, as each radio frequency device would need to know in advance the correction signals sent by the other radio frequency devices.

[0059] Specifically, each RF device contains multiple antennas. Assuming the first RF device contains K antennas, before channel calibration is performed between the first RF device and other RF devices, each channel in the first RF device should first complete self-calibration. Various calibration algorithms, such as Argos and LS (Least Squares), can be used for channel self-calibration of RF devices, which will not be elaborated upon here. After the first RF device completes channel self-calibration, then...

[0060]

[0061] Among them, c anti For antenna i The correction factor, t anti For antenna i Transmitter channel inconsistency factor, r anti For antenna iThe receiver channel inconsistency factor, α, represents the transmit / receive ratio of the antenna after calibration by the first radio frequency device. This means that after calibration, the transmit / receive ratio of each antenna channel in the first radio frequency device is consistent. In an optional embodiment, each radio frequency device performs channel self-calibration before performing channel calibration with other radio frequency devices.

[0062] During channel calibration by the first and second radio frequency devices, an antenna is selected from the first radio frequency device, denoted as ref. A Select an antenna from the second radio frequency device, denoted as ref. B The two antennas exchange correction sequences. When the ref in the first radio frequency device A Send the first correction signal, the ref in the second radio frequency device B The first correction signal is received, and channel estimation is performed to obtain the second channel estimation result. The second channel estimation result can be denoted as:

[0063]

[0064] in, For antenna ref A The correction factor, For antenna ref A Inconsistency factor of the sending channel For antenna ref B Inconsistency factor of the receiving channel For antenna ref A →ref B The air interface channel response.

[0065] The ref in the first radio frequency device A Ref in the second radio frequency device B The second correction signal is sent, and channel estimation is performed to obtain the first channel estimation result, which can be denoted as:

[0066]

[0067] in, For antenna ref B The correction factor, For antenna ref B Inconsistency factor of the sending channel For antenna ref A Inconsistency factor of the receiving channel For antenna ref B →ref A The air interface channel response.

[0068] The first radio frequency device also receives the second channel estimation result and performs channel correction based on the first and second channel estimation results. Because there are Then define a coefficient η B ,

[0069]

[0070] Keeping the correction coefficients in the first RF device unchanged, update the antenna correction coefficients in the second RF device to... This allows for channel calibration between the first and second radio frequency devices.

[0071] At this point, the transmit / receive ratio of the antenna in the second radio frequency device becomes:

[0072]

[0073] Based on the above derivation, it can be seen that channel calibration has been completed between antennas A and B, and they have the same transmit / receive ratio. Since the first and second RF devices have already completed channel self-calibration, channel calibration between them is now complete. After the first and second RF devices complete channel calibration, the antenna calibration coefficients of other RF devices in the same group as the second RF device also need to be multiplied by η. B Adjustments will be made.

[0074] In the above embodiments, the first radio frequency device and the second radio frequency device perform channel estimation and channel correction through the correction signal. Of course, the channel estimation can also be completed by the base station where the radio frequency device is located. After receiving the correction signal, the radio frequency device sends the corresponding correction signal to the base station, which performs channel estimation and performs channel correction based on the channel estimation result.

[0075] Please refer to Figure 4 As shown, Figure 4 This is a flowchart of channel calibration in another embodiment of this application. The channel calibration method includes: S401: performing self-calibration on L radio frequency devices that need to be calibrated; wherein, L≥4; S402: dividing the L radio frequency devices into L level 0 radio frequency device groups, wherein, k=1, N=L; each level 0 radio frequency device group includes 1 radio frequency device. Although in Figure 4In the schematic diagram, S401 is executed first, followed by S402. However, in actual execution, there is no fixed order; S402 can be executed first, followed by S401. S403: Divide the N k-1 level RF device groups into M k-level RF device groups. Each of the M k-level RF device groups includes one or two RF device groups, and at most one k-level RF device group includes one k-1 level RF device group. Each k-1 level RF device group includes at least one RF device. S404: For each k-level RF device group containing two k-1 level RF device groups, perform channel calibration between the two k-1 level RF device groups within that k-level RF device group. S405: Determine whether the following conditions are met. If satisfied Then execute S406; if not satisfied. Then execute S407. When performing channel calibration according to the methods in S403 and S404, ensure that the k-1 level RF device groups that meet the conditions are calibrated simultaneously, improving calibration efficiency. Furthermore, after this calibration, ideally, only... One calibration cycle is sufficient to complete the calibration between L RF devices. If the following conditions are met... This indicates that the calibration is not yet complete, and the M-group k-level RF devices need to be further grouped. If the requirements are not met... This indicates that the correction is complete. S406, let k = k + 1, N = M, and return to S403. S407: Correction complete.

[0076] Through the above embodiments, we can see that the method in the embodiments of the present invention can complete channel calibration between L radio frequency devices, and each time multiple groups of radio frequency devices perform channel calibration simultaneously. Ideally, only Mutual calibration can be completed in one calibration cycle. When the number of RF devices L is large, the calibration efficiency will be significantly improved.

[0077] Please refer to Figure 5 As shown, Figure 5This is a flowchart of channel calibration in another embodiment of this application. S501: Divide L radio frequency devices into L groups of level 0 radio frequency devices, where k = 1, N = L, and L ≥ 4; each group of level 0 radio frequency devices includes one radio frequency device. S502: Divide N groups of k-1 radio frequency devices into M groups of k radio frequency devices, where each of the M groups of k radio frequency devices includes one or two radio frequency device groups, and at most one group of k radio frequency devices includes one group of k-1 radio frequency devices; wherein each group of k-1 radio frequency devices includes at least one radio frequency device. S503: Determine whether the group of k-1 radio frequency devices has completed intra-group self-calibration. If intra-group self-calibration is completed, proceed to S505; if intra-group self-calibration is not completed, proceed to S504. S504: Perform intra-group self-calibration. Figure 5 In the flowchart of the embodiment, S502 is completed before S503 and S504. This application does not limit their order; S503 and S504 can be executed first, followed by S502, to achieve the same purpose. The purpose of S503 and S504 is to ensure that intra-group self-calibration is completed before mutual calibration between RF device groups. S505: For each k-level RF device group containing two k-1 level RF device groups, channel calibration is performed between the two k-1 level RF device groups. S506: Determine whether the requirements are met. If satisfied Then execute S507; if not satisfied. Then execute 508. S507, set k = k + 1, N = M, and return to S502. S508: Correction complete.

[0078] Figure 4 and Figure 5 The channel calibration method in the system allows setting a fixed time period to complete sequential calibration within each time period. The time period can be determined based on the stability of the RF device. If the RF device is stable, a longer time period can be set; if the RF device is unstable and changes rapidly, a shorter time period can be set. Figure 4 and Figure 5 The channel calibration method described herein can also be manually activated as needed. This application does not limit the specific application of this channel calibration method.

[0079] To more intuitively illustrate the channel correction method in the embodiments of the present invention, Figures 6-9 The diagrams illustrate channel calibration between RF devices when the number of RF devices is 5, 6, 7, and 8, respectively. The numbers ①②③ in the diagrams indicate the order in which the calibration is performed. Those skilled in the art should understand that... Figures 6-9The radio frequency devices in the diagram are for illustrative purposes only and do not represent their positional or sequential relationships. The numbers of the radio frequency devices in the diagram can be interchanged arbitrarily. Figures 6-9 The diagram only illustrates one grouping method. Those skilled in the art should understand that there may be multiple equivalent grouping methods in each grouping process. Figures 6-9 In this context, the radio frequency devices performing mutual calibration are only one possible calibration combination for achieving the calibration objective. It is understood that other calibration combinations may also exist to achieve the calibration objective. In the following description, only the channel calibration situation under ideal conditions is illustrated, that is, all radio frequency device groups capable of simultaneous calibration are calibrated simultaneously.

[0080] Please refer to Figure 6 As shown, Figure 6 This diagram illustrates channel calibration between RF devices when there are 5 RF devices. During channel calibration, each RF device is grouped into a Level 0 RF device group. However, this step can be omitted; it is assumed that each RF device is in a Level 0 RF device group. To simplify the description, it is assumed that all RF devices have already completed channel self-calibration within their groups. First, the RF devices are grouped to obtain 3 Level 1 RF device groups, as follows: Figure 6 As shown, RF devices 601 and 602 form a first-level RF device group, RF devices 603 and 604 form a second-level RF device group, and RF device 605 forms a third-level RF device group. Then, for each level 1 RF device group, channel correction is performed between the level 0 RF device groups within the group. That is, channel correction is performed between RF devices 601 and 602, and between RF devices 603 and 604.

[0081] After the first calibration is completed, the Level 1 RF device group is then divided into pairs, as follows: Figure 6As shown, the first level 1 radio frequency device group and the second level 1 radio frequency device group are combined to form a first level 2 radio frequency device group, that is, radio frequency device 601, radio frequency device 602, radio frequency device 603 and radio frequency device 604 form the first level 2 radio frequency device group, and the third level 1 radio frequency device group is the second level 2 radio frequency device group, that is, radio frequency device 605 is the second level 2 radio frequency device group. Of course, the first-level radio frequency device group can also be grouped into a first-level radio frequency device group, that is, radio frequency device 601 and radio frequency device 602 form a first-level radio frequency device group, and the second-level radio frequency device group and the third-level radio frequency device group form a second-level radio frequency device group, that is, radio frequency device 603, radio frequency device 604 and radio frequency device 605 form a second-level radio frequency device group; or the second-level radio frequency device group can be grouped into a first-level radio frequency device group, that is, radio frequency device 603 and radio frequency device 604 form a first-level radio frequency device group, and the first-level radio frequency device group and the third-level radio frequency device group form a second-level radio frequency device group, that is, radio frequency device 601, radio frequency device 602 and radio frequency device 605 form a second-level radio frequency device group. These will not be elaborated in the following embodiments, and those skilled in the art should understand that there are many possible grouping situations.

[0082] by Figure 6 The following describes the situation illustrated, where the first-level RF device group includes 601 and 602, and the second-level RF device group includes 603 and 604. Channel calibration is performed between the first-level and second-level RF device groups. Specifically, the calibration method involves selecting one RF device 601 from the first-level RF device group and one RF device 603 from the second-level RF device group for channel calibration. Of course, other calibration combinations are possible, such as RF device 601 and RF device 604, RF device 602 and RF device 604, or RF device 602 and RF device 603. If all these calibration combinations achieve the calibration objective, only one needs to be selected for calibration; if not every calibration combination can achieve the calibration objective, a set of calibration combinations that achieve the calibration objective is selected for channel calibration. In subsequent embodiments, the possibility of multiple calibration combinations will not be elaborated further; only the RF device selected in the schematic diagram will be used as an example for explanation. After the channel calibration of RF devices 601 and 603 is completed, if the antenna calibration coefficient of RF device 601 is adjusted, the antenna calibration coefficient of RF device 602 is also adjusted by multiplying it by the same coefficient; similarly, if the antenna calibration coefficient of RF device 603 is adjusted, the antenna calibration coefficient of RF device 604 is also adjusted by multiplying it by the same coefficient. Subsequent calibrations of the RF device group follow a similar method, and the adjustment of antenna calibration coefficients within the same k-1 level RF device group will not be described again.

[0083] After the second calibration is completed, the two-stage RF device groups are then combined in pairs, as there is only one possible combination: the first stage RF device group includes 601, 602, 603, and 604, and the second stage RF device group includes 605. Calibration is then performed on both stages, selecting RF device 603 from the first stage RF device group and RF device 605 from the second stage RF device group for channel calibration. Once calibration is complete, the process is finished. Figure 6 Channel calibration between the five radio frequency devices shown.

[0084] from Figure 6 As can be seen from the above, by using the method in the embodiments of this application, only the following steps are required: One calibration cycle completes the calibration between the RF device groups.

[0085] Please follow Figure 7 As shown, Figure 7 This diagram illustrates channel calibration between six radio frequency (RF) devices. During calibration, the six Level 0 RF device groups are first paired into three Level 1 RF device groups: RF devices 701 and 702 form the first Level 1 group, RF devices 703 and 704 form the second Level 1 group, and RF devices 705 and 706 form the third Level 1 group. Then, for each Level 1 RF device group, channel calibration is performed simultaneously between the two Level 0 RF device groups within that group; specifically, channel calibration is performed between RF devices 701 and 702, 703 and 704, and 705 and 706.

[0086] After the first calibration is completed, the Level 1 RF device group is then divided into pairs, such as... Figure 7 As shown, the first and second level 1 RF device groups are combined to form a first level 2 RF device group, namely RF devices 701, 702, 703, and 704; the third level 1 RF device group is combined to form a second level 2 RF device group, namely RF devices 705 and 706. For each level 2 RF device group containing two level 1 RF device groups, channel correction is performed between the two level 1 RF device groups within the group. Specifically, channel correction is performed between the two level 1 RF device groups in the first level 2 RF device group by selecting RF device 701 from the first level 1 RF device group and RF device 703 from the second level 1 RF device group for channel correction. Since the second level 2 RF device group contains only one level 1 RF device group, channel correction is not required at this stage.

[0087] After the second calibration, the two-level RF device groups are then paired up, as there is only one possible combination: a single three-level RF device group comprising a first two-level RF device group and a second two-level RF device group. For each three-level RF device group containing two two-level RF device groups, channel calibration is performed between the two groups. Specifically, channel calibration is performed on the first and second-level RF device groups, selecting RF device 703 from the first-level RF device group and RF device 705 from the second-level RF device group for channel calibration. After calibration, the process is complete. Figure 7 Channel calibration between the six radio frequency devices shown.

[0088] from Figure 7 As can be seen from the above, by using the method in the embodiments of this application, only the following steps are required: One calibration cycle completes the calibration between the RF device groups.

[0089] Please refer to Figure 8 As shown, Figure 8 This diagram illustrates channel calibration between seven radio frequency (RF) devices. During calibration, the seven Class 0 RF device groups are first paired, resulting in four Class 1 RF device groups: RF devices 801 and 802 form the first Class 1 group, RF devices 803 and 804 form the second Class 1 group, RF devices 805 and 806 form the third Class 1 group, and RF device 807 forms the fourth Class 1 group. Then, for each Class 1 RF device group containing two Class 0 RF device groups, channel calibration is performed simultaneously between the two Class 0 RF device groups within the group. Specifically, channel calibration is performed between RF devices 801 and 802, 803 and 804, and 805 and 806. Since the fourth Class 1 RF device group contains only one Class 0 RF device group, no channel calibration is performed for this group.

[0090] After the first calibration is completed, the Level 1 RF device group is then divided into pairs, such as... Figure 8As shown, the first and second level 1 RF device groups are combined to form the first level 2 RF device group, namely RF devices 801, 802, 803, and 804; the third and fourth level 1 RF device groups are combined to form the second level 2 RF device group, namely RF devices 805, 806, and 807. For each level 2 RF device group containing two level 1 RF device groups, channel correction is performed simultaneously between the two level 1 RF device groups within the group. That is, channel correction is performed between the two level 1 RF device groups in the first level 2 RF device group, and simultaneously, channel correction is performed between the two level 1 RF device groups in the second level 2 RF device group. During calibration, radio frequency device 801 is selected from the first level 1 radio frequency device group, and radio frequency device 803 is selected from the second level 1 radio frequency device group for channel calibration; at the same time, radio frequency device 805 is selected from the third level 1 radio frequency device group, and radio frequency device 807 included in the fourth level 1 radio frequency device group for channel calibration.

[0091] After the second calibration, the two-level RF device groups are then paired up, as each pair contains only one combination: a single three-level RF device group (either the first two-level RF device group or the second two-level RF device group). For each three-level RF device group containing two two-level RF device groups, channel calibration is performed between the two groups. Specifically, channel calibration is performed on the first and second-level RF device groups, selecting RF device 804 from the first group and RF device 806 from the second group for channel calibration. Once calibration is complete, the process is finished. Figure 8 Channel calibration between the seven radio frequency devices shown.

[0092] from Figure 8 As can be seen from the above, by using the method in the embodiments of this application, only the following steps are required: One calibration cycle completes the calibration between the RF device groups.

[0093] Please refer to Figure 9 As shown, Figure 9This diagram illustrates channel calibration between eight radio frequency (RF) devices. During calibration, the eight Class 0 RF device groups are first paired, resulting in four Class 1 RF device groups: RF devices 901 and 902 form the first Class 1 group, RF devices 903 and 904 form the second Class 1 group, RF devices 905 and 906 form the third Class 1 group, and RF devices 907 and 908 form the fourth Class 1 group. Then, for each Class 1 RF device group containing two Class 0 RF device groups, channel calibration is performed simultaneously between the two Class 0 RF device groups within the group. Specifically, channel calibration is performed between RF devices 901 and 902, RF devices 903 and 904, RF devices 905 and 906, and RF devices 907 and 908.

[0094] After the first calibration is completed, the Level 1 RF device group is then divided into pairs, such as... Figure 9 As shown, the first and second level 1 RF device groups are combined to form the first level 2 RF device group, namely RF devices 901, 902, 903, and 904; the third and fourth level 1 RF device groups are combined to form the second level 2 RF device group, namely RF devices 905, 906, 907, and 908. Channel calibration is performed between the two level 1 RF device groups within the first level 2 RF device group. Then, for each level 2 RF device group containing two level 1 RF device groups, channel calibration is simultaneously performed between the two level 1 RF device groups within the group. Specifically, RF device 901 is selected from the first level 1 RF device group, and RF device 903 is selected from the second level 1 RF device group for channel calibration; simultaneously, RF device 905 is selected from the third level 1 RF device group, and RF device 907 is selected from the fourth level 1 RF device group for channel calibration.

[0095] After the second calibration is completed, the two-level RF device groups are then paired up, as there is only one possible combination: a single three-level RF device group, consisting of the first two-level RF device group and the second two-level RF device group. For each three-level RF device group containing two two-level RF device groups, channel calibration is performed between the two groups. Specifically, channel calibration is performed on the first and second-level RF device groups, selecting RF device 904 from the first-level RF device group and RF device 906 from the second-level RF device group for channel calibration. After calibration, the process is complete. Figure 9 Channel calibration between the eight radio frequency devices shown.

[0096] from Figure 9 As can be seen from the above, by using the method in the embodiments of this application, only the following steps are required: One calibration cycle completes the calibration between the RF device groups.

[0097] Figures 6-9 The diagrams in the illustrations use only a small number of RF devices as examples. It is understood that when the number of RF devices requiring calibration increases, calibration can still be performed using the same method. Figures 6-9 As can be seen from the embodiments of the present invention, the method disclosed has good versatility. Regardless of whether the number L of radio frequency devices to be calibrated is odd or even, it can be calibrated by pairwise grouping, and only requires The calibration can be achieved in just one calibration cycle. In contrast, existing technologies require sequential calibration of RF devices, necessitating (L-1) calibration cycles. For situations involving a large number of RF devices, the method described in this invention significantly improves calibration efficiency.

[0098] Based on the same technical concept, see [reference] Figure 10 As shown in the figure, this application embodiment also provides a channel correction device, which includes: an allocation unit 1001, a correction unit 1002, and a control unit 1003. The channel correction device is used to perform channel correction on L radio frequency devices, wherein the L radio frequency devices are L groups of level 0 radio frequency devices, each group of level 0 radio frequency devices contains one radio frequency device, L≥4 and L is a positive integer; let N=L, k=1. The allocation unit 1001 is used to divide the N groups of k-1 level radio frequency devices into M groups of k level radio frequency devices, wherein M, N, and k are positive integers, M≥1, N>M, k≥1; in the M groups of k level radio frequency devices, each group of k level radio frequency devices includes one or two groups of k-1 level radio frequency devices, and at most one group of k level radio frequency devices includes one group of k-1 level radio frequency devices; wherein each group of k-1 level radio frequency devices includes at least one radio frequency device. The calibration unit 1002 is used to perform channel calibration between the two k-1 level RF device groups for each group containing two k-1 level RF device groups. The control unit 1003 is used to determine whether channel calibration has been completed between the L RF devices. If calibration has not been completed between the L RF devices, then k = k + 1 and N = M; and controls the allocation unit and the calibration unit to perform allocation and calibration.

[0099] Figure 10 The channel correction device shown can be located on the base station where the radio frequency device is located, such as in the baseband part of the base station, or in the radio frequency device. This application does not limit it.

[0100] Please refer to Figure 11 As shown, Figure 11 This is a schematic diagram of the correction unit 1002. The correction unit 1002 includes a control subunit 1101, a channel estimation subunit 1102, and a channel correction subunit 1103.

[0101] Control subunit 1101 is used to determine the first and second radio frequency devices for channel correction in two k-1 level radio frequency device groups. The first and second radio frequency devices only need to be able to send and receive correction signals to each other. In an optional embodiment, the first and second radio frequency devices are determined by arbitrarily selecting one radio frequency device from each of the two k-1 level radio frequency device groups to form a correction combination, wherein the first and second radio frequency devices are the two closest radio frequency devices among all correction combinations.

[0102] The control subunit 1101 is also configured to control the first radio frequency device to send a first correction signal to the second radio frequency device through the first channel, and to receive a second correction signal sent by the second radio frequency device through the first channel; and to control the second radio frequency device to receive the first correction signal sent by the first radio frequency device through the first channel, and to send a second correction signal to the first radio frequency device through the first channel.

[0103] The channel estimation subunit 1102 is used to determine a first channel estimation result based on the second correction signal received by the first radio frequency device and the second correction signal sent by the second radio frequency device; and to determine a second channel estimation result based on the first correction signal received by the second radio frequency device and the first correction signal sent by the first radio frequency device.

[0104] The channel correction subunit 1103 is used to perform channel correction based on the first channel estimation result and the second channel estimation result. During channel correction, the channel correction between the two k-1 level radio frequency device groups is completed by adjusting the antenna correction coefficients of each radio frequency device in one of the k-1 level radio frequency device groups.

[0105] Please refer to Figure 12 As shown, Figure 12 This is a schematic diagram of a base station structure provided in an embodiment of this application. Figure 12 As shown, the base station includes an antenna 1201, a radio frequency (RF) device 1202, and a baseband device 1203. The antenna 1201 and the RF device 1202 are connected. In the uplink direction, the RF device 1202 receives information sent by the terminal through the antenna 1201 and transmits the information to the baseband device 1203 for processing. In the downlink direction, the baseband device 1203 processes the terminal's information and transmits it to the RF device 1202. The RF device 1202 processes the terminal's information and then transmits it to the terminal through the antenna 1201.

[0106] The channel correction device described above can be located on the baseband device 1203, which includes a processor 1203-1 and a memory 1203-2. The baseband device 1203 may include at least one baseband board, on which multiple chips are disposed, such as... Figure 12 As shown, in one of the chips, processor 1203-1 is connected to memory 1203-2 and is used to call the program in memory 1203-2 to execute the operations shown in the above method embodiments. The baseband device may also include interface 1203-3 for exchanging information with radio frequency device 1202. This interface may be a Common Public Radio Interface (CPRI).

[0107] The processor 1203-1 in this embodiment of the invention can be a general-purpose processor, such as a central processing unit, or it can be one or more integrated circuits configured to implement the above methods, such as one or more application-specific integrated circuits (ASICs), one or more digital signal processing chips (DSPs), or one or more field-programmable gate arrays (FPGAs), etc.

[0108] In this embodiment of the invention, memory 1203-2 refers to a general term for memory. This includes, but is not limited to: random access memory, main memory, read-only memory (ROM), registers, hard disks, removable disks, CD-ROMs, and other forms of storage media known to those skilled in the art.

[0109] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can 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, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0110] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0111] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0112] Although alternative embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make further changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the alternative embodiments as well as all changes and modifications falling within the scope of the invention.

[0113] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Therefore, if these modifications and variations to the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A channel calibration method, characterized in that, The channel correction method is used to perform channel correction on L radio frequency devices, wherein the L radio frequency devices are L groups of level 0 radio frequency devices, L≥4, and L is a positive integer; Let N=L, k=1; the channel correction method includes: N k-1 level RF device groups are divided into M k-level RF device groups, where M and N are positive integers, M ≥ 1, and N > M; each of the M k-level RF device groups includes one or two k-1 level RF device groups, and at most one k-level RF device group includes one k-1 level RF device group; wherein each k-1 level RF device group includes at least one RF device. For each k-level radio frequency device group containing two k-1 level radio frequency device groups, one radio frequency device is selected from each of the two k-1 level radio frequency device groups, and channel correction is performed between the two radio frequency devices to complete the channel correction between the two k-1 level radio frequency device groups. Let k = k + 1, N = M; repeat the channel calibration method until channel calibration is completed among L radio frequency devices.

2. The method according to claim 1, wherein the M groups of k-level radio frequency devices include a first k-level radio frequency device group and a second k-level radio frequency device group, wherein, In the case where the first k-level RF device group includes a first k-1 level RF device group and a second k-1 level RF device group, and the second k-level RF device group includes a third k-1 level RF device group and a fourth k-1 level RF device group, the channel correction between the two k-1 level RF device groups for each k-level RF device group containing two k-1 level RF device groups includes: While performing channel calibration on the first k-1 level RF device group and the second k-1 level RF device group, channel calibration is also performed on the third k-1 level RF device group and the fourth k-1 level RF device group.

3. The method according to claim 2, characterized in that, The channel calibration of the first k-1 level RF device group and the second k-1 level RF device group includes: When the first k-1 level RF device group and the second k-1 level RF device group include at least 3 RF devices, a first RF device is selected from the first k-1 level RF device group, a second RF device is selected from the second k-1 level RF device group, and channel correction is performed between the first RF device and the second RF device. Among them, the first radio frequency device and the second radio frequency device are the two radio frequency devices that are closest to each other in all the correction combinations; the correction combination is composed of arbitrarily selecting a radio frequency device from the first k-1 level radio frequency device group and arbitrarily selecting a radio frequency device from the second k-1 level radio frequency device group.

4. The method according to claim 3, characterized in that, The step of selecting a first radio frequency device from the first k-1 level radio frequency device group and selecting a second radio frequency device from the second k-1 level radio frequency device group includes: Based on the distance between the two radio frequency devices in each correction combination, the radio frequency devices in the closest correction combination are determined to be the first radio frequency device and the second radio frequency device; or... Based on the Reference Signal Received Power (RSRP) between the two radio frequency devices in each correction combination, the radio frequency devices in the correction combination with the largest RSRP are determined to be the first radio frequency device and the second radio frequency device.

5. The method according to claim 3 or 4, characterized in that, The channel calibration between the first radio frequency device and the second radio frequency device includes: Determine a first correction factor for the first radio frequency device relative to the second radio frequency device; The first radio frequency device is channel-corrected according to the first correction coefficient, so that the antennas of the first radio frequency device and the second radio frequency device have the same transmit / receive ratio.

6. The method according to claim 5, characterized in that, After determining the first correction coefficient of the first radio frequency device relative to the second radio frequency device, the method further includes: Channel correction is performed on other radio frequency devices in the first k-1 level radio frequency device group based on the first correction coefficient.

7. The method according to claim 5, characterized in that, Determining the first correction coefficient of the first radio frequency device relative to the second radio frequency device includes: The first radio frequency device sends a first correction signal to the second radio frequency device through a first channel, and receives a second correction signal sent by the second radio frequency device to the first radio frequency device through the first channel; The first radio frequency device performs channel estimation based on the second correction signal to determine the first channel estimation result; The first radio frequency device receives a second channel estimation result obtained by the second radio frequency device performing channel estimation based on the first correction signal; and The first radio frequency device determines a first correction coefficient relative to the second radio frequency device based on the first channel estimation result and the second channel estimation result.

8. A channel calibration device, characterized in that, The channel correction device is used to perform channel correction on L radio frequency devices, wherein the L radio frequency devices are L groups of level 0 radio frequency devices, L≥4, and L is a positive integer; let N=L, k=1; the channel correction device includes a distribution unit, a correction unit, and a control unit; The allocation unit is used to divide N k-1 level radio frequency device groups into M k level radio frequency device groups, where M, N and k are positive integers, M≥1, N>M; each of the M k level radio frequency device groups includes 1 or 2 k-1 level radio frequency device groups, and at most one k level radio frequency device group includes 1 k-1 level radio frequency device group. The correction unit is used to select one radio frequency device from each of the two k-1 level radio frequency device groups for each group containing two k-1 level radio frequency device groups, and perform channel correction between the two radio frequency devices to complete the channel correction between the two k-1 level radio frequency device groups. The control unit is used to determine whether the L radio frequency devices have completed channel calibration. If the L radio frequency devices have not completed calibration, then let k=k+1 and N=M; and control the allocation unit and the calibration unit to perform allocation and calibration.

9. A computer-readable storage medium, characterized in that, The storage medium stores a computer program, wherein the computer program is configured to execute the method of any one of claims 1-7 when it is run.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method as described in any one of claims 1-7.

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