Antenna connection detection method and apparatus

1. An antenna connection detection method, wherein the method is applied to a network side device, the network side device comprises a plurality of communications interfaces, and each communications interface is connected to one antenna element, wherein the method comprises:

receiving, by the network side device by using antenna elements connected to the plurality of communications interfaces, reference signals sent by N terminal devices, wherein N is an integer greater than 0;

determining, by the network side device, N channel correlation matrices based on the reference signals sent by the N terminal devices, wherein one channel correlation matrix is used to represent correlation between transmission channels between the network side device and one terminal device; and

determining, by the network side device based on the N channel correlation matrices and a preset channel correlation matrix, whether a connection sequence between the plurality of communications interfaces and the antenna elements is incorrect.

2. The method according to claim 1 , wherein the determining, by the network side device, N channel correlation matrices based on the reference signals sent by the N terminal devices comprises:

determining, by the network side device, an it channel response matrix based on a reference signal sent by an i th terminal device, wherein the i th channel response matrix comprises response coefficients of transmission channels between the network side device and the i th terminal device, and i is any positive integer not greater than N; and

determining, by the network side device, an i th channel correlation matrix based on the i th channel response matrix, wherein the i th channel correlation matrix is used to represent correlation between the transmission channels between the network side device and the i th terminal device.

3. The method according to claim 2 , wherein the determining, by the network side device, an i th channel correlation matrix based on the i th channel response matrix comprises:

multiplying, by the network side device, a conjugate transpose matrix of the i th channel response matrix by the i th channel response matrix, to obtain the i th channel correlation matrix.

4. The method according to claim 1 , wherein N is equal to 1, and the determining, by the network side device based on the N channel correlation matrices and a preset channel correlation matrix, whether a connection sequence between the plurality of communications interfaces and the antenna elements is incorrect comprises:

performing, by the network side device, diagonal normalization processing on one channel correlation matrix to obtain a normalized matrix;

comparing, by the network side device, the normalized matrix with the preset channel correlation matrix; and

if an error between at least one array element in the normalized matrix and an array element at a same location in the preset channel correlation matrix is not within an error range, determining, by the network side device, that the connection sequence between the plurality of communications interfaces and the antenna elements is incorrect.

5. The method according to claim 1 , wherein N is greater than 1, and the determining, by the network side device based on the N channel correlation matrices and a preset channel correlation matrix, whether a connection sequence between the plurality of communications interfaces and the antenna elements is incorrect comprises:

determining, by the network side device, a statistical distribution feature of the N channel correlation matrices to obtain a statistical distribution feature matrix:

performing, by the network side device, diagonal normalization processing on the statistical distribution feature matrix to obtain a normalized matrix;

comparing, by the network side device, the normalized matrix with the preset channel correlation matrix; and

if an error between at least one array element in the normalized matrix and an array element at a same location in the preset channel correlation matrix is not within an error range, determining, by the network side device, that the connection sequence between the plurality of communications interfaces and the antenna elements is incorrect.

6. The method according to claim 1 , wherein the preset channel correlation matrix is:

[

A

⁡

(

M

2

×

M

2

)

B

⁡

(

M

2

×

M

2

)

B

⁡

(

M

2

×

M

2

)

A

⁡

(

M

2

×

M

2

)

]

,

wherein

A

⁡

(

M

2

×

M

2

)

is a correlation matrix between co-polarized antenna columns, M is a quantity of communications interfaces, and

B

⁡

(

M

2

×

M

2

)

is a correlation matrix between cross-polarized antenna columns.

7. The method according to claim 6 , wherein

A

⁡

(

M

2

×

M

2

)

conforms to the following matrix:

[

1

α

⋯

α

M

2

-

1

α

1

⋱

⋮

⋮

⋱

1

α

α

M

2

-

1

⋯

α

1

]

,

wherein

α is a correlation coefficient between adjacent co-polarized antenna columns.

8. The method according to claim 6 , wherein

B

⁡

(

M

2

×

M

2

)

is a matrix in which all array elements are β, and β is a correlation coefficient between any two cross-polarized antennas columns.

9. A network side device, wherein the device comprises:

a plurality of communications interfaces and at least one processor, wherein one communications interface is connected to one antenna element:

the plurality of communications interfaces are configured to receive, by using antenna elements connected to the plurality of communications interfaces, reference signals sent by N terminal devices, wherein N is an integer greater than 0; and

the at least one processor is configured to determine N channel correlation matrices based on the reference signals that are sent by the N terminal devices and that are received by the plurality of communications interfaces, wherein one channel correlation matrix is used to represent correlation between transmission channels between the network side device and one terminal device; and determine, based on the N channel correlation matrices and a preset channel correlation matrix, whether a connection sequence between the plurality of communications interfaces and the antenna elements is incorrect.

10. The device according to claim 9 , wherein when the at least one processor is configured to determine the N channel correlation matrices based on the reference signals sent by the N terminal devices, the at least one processor is configured to:

determine an i th channel response matrix based on a reference signal sent by an i th terminal device, wherein the i th channel response matrix comprises response coefficients of transmission channels between the network side device and the i th terminal device, and i is any positive integer not greater than N; and

determine an i th channel correlation matrix based on the i th channel response matrix, wherein the i th channel correlation matrix is used to represent correlation between the transmission channels between the network side device and the i th terminal device.

11. The device according to claim 10 , wherein when the at least one processor is configured to determine the i th channel correlation matrix based on the i th channel response matrix, the at least one processor is configured to:

multiply a conjugate transpose matrix of the i th channel response matrix by the i th channel response matrix, to obtain the it channel correlation matrix.

12. The device according to claim 9 , wherein N is equal to 1, and when the at least one processor is configured to determine, based on the N channel correlation matrices and the preset channel correlation matrix, whether the connection sequence between the plurality of communications interfaces and the antenna elements is incorrect, the processor is specifically configured to:

perform diagonal normalization processing on one channel correlation matrix to obtain a normalized matrix;

compare the normalized matrix with the preset channel correlation matrix; and

if an error between at least one array element in the normalized matrix and an array element at a same location in the preset channel correlation matrix is not within an error range, determine that the connection sequence between the plurality of communications interfaces and the antenna elements is incorrect.

13. The device according to claim 9 , wherein N is greater than 1, and when the at least one processor is configured to determine, based on the N channel correlation matrices and the preset channel correlation matrix, whether the connection sequence between the plurality of communications interfaces and the antenna elements is incorrect, the at least one processor is configured to:

determine a statistical distribution feature of the N channel correlation matrices to obtain a statistical distribution feature matrix;

perform diagonal normalization processing on the statistical distribution feature matrix to obtain a normalized matrix;

compare the normalized matrix with the preset channel correlation matrix; and

if an error between at least one array element in the normalized matrix and an array element at a same location in the preset channel correlation matrix is not within an error range, determine that the connection sequence between the plurality of communications interfaces and the antenna elements is incorrect.

14. The device according to claim 9 , wherein the preset channel correlation matrix is:

[

A

⁡

(

M

2

×

M

2

)

B

⁡

(

M

2

×

M

2

)

B

⁡

(

M

2

×

M

2

)

A

⁡

(

M

2

×

M

2

)

]

,

wherein

A

⁡

(

M

2

×

M

2

)

is a correlation matrix between co-polarized antenna columns, M is a quantity of communications interfaces, and

B

⁡

(

M

2

×

M

2

)

is a correlation matrix between cross-polarized antenna columns.

15. The device according to claim 14 , wherein

A

⁡

(

M

2

×

M

2

)

conforms to the following matrix:

[

1

α

⋯

α

M

2

-

1

α

1

⋱

⋮

⋮

⋱

1

α

α

M

2

-

1

⋯

α

1

]

,

wherein

α is a correlation coefficient between adjacent co-polarized antenna columns.

16. The device according to claim 14 , wherein

B

⁡

(

M

2

×

M

2

)

is a matrix in which all array elements are β, and β is a correlation coefficient between any two cross-polarized antennas columns.