Wireless communication device and wireless communication method

1. A wireless communication apparatus which participates in wireless communication involving an antenna array, comprising:

processing circuitry configured to

receive, from a target communication apparatus for the wireless communication apparatus, a signal including antenna array geometry information of the target communication apparatus and receive a training sequence signal;

determine geometry configuration of the antenna array of the target communication apparatus based on the signal;

estimate channel characteristic of a channel from the target communication apparatus to the wireless communication apparatus based on the training sequence signal; and

determine, based on the geometry configuration of the antenna array of the target communication apparatus and channel estimation result, channel feedback information indicating the channel characteristic of the channel from the target communication apparatus to the wireless communication apparatus,

wherein the antenna array geometry information indicates at least one of positional relationship among antenna elements in the antenna array, spacing between the antenna elements, and antenna polarization direction.

2. The wireless communication apparatus according to claim 1 , wherein the processing circuitry determines a feedback codebook corresponding to the geometry configuration of the antenna array based on the geometry configuration of the antenna array, and further determines a codeword which matches the channel estimation result in the feedback codebook, and includes an index number of the codeword in the channel feedback information.

3. The wireless communication apparatus according to claim 2 , wherein the processing circuitry further comprises a codebook storage unit configured to store a plurality of feedback codebooks corresponding to a plurality of geometry configurations of the antenna array, wherein the processing circuitry determines the feedback codebook corresponding to the geometry configuration of the antenna array by querying the codebook storage unit.

4. The wireless communication apparatus according to claim 2 , wherein the feedback codebook includes a precoding matrix codebook.

5. The wireless communication apparatus according to claim 1 , wherein the channel characteristic of the channel from the target communication apparatus to the wireless communication apparatus which is estimated includes at least one of short-term channel characteristic and long-term channel characteristic, wherein the processing circuitry determines the corresponding channel feedback information based on the geometry configuration of the antenna array.

6. The wireless communication apparatus according to claim 1 , wherein the processing circuitry estimates short-term channel characteristic of the channel from the target communication apparatus to the wireless communication apparatus based on the training sequence signal, and estimates long-term channel characteristic of the channel from the target communication apparatus to the wireless communication apparatus based on the short-term channel characteristic and the geometry configuration of the antenna array of the target communication apparatus.

7. The wireless communication apparatus according to claim 6 , wherein the processing circuitry determines, based on short-term channel estimation values for a plurality of antenna pairs having the same relative geometry relationship in the antenna array, long-term channel information estimation value for at least one of the plurality of antenna pairs, in order to estimate the long-term channel characteristic of the channel from the target communication apparatus to the wireless communication apparatus,

wherein each antenna pair includes a first antenna element and a second antenna element, and there is the same geometry relationship between the first antenna element and the second antenna element included in each of the plurality of antenna pairs having the same relative geometry relationship in the antenna array.

8. The wireless communication apparatus according to claim 7 , wherein the relative geometry relationship between the first antenna element and the second antenna element includes spatial position deviation and polarization direction deviation.

9. The wireless communication apparatus according to claim 1 , wherein the processing circuitry is further configured to transmit configuration information of the antenna array of the wireless communication apparatus to the target communication apparatus, wherein the configuration information of the antenna array includes the number of antenna elements of the wireless communication apparatus or antenna array geometry information of the wireless communication apparatus.

10. A wireless communication method applied in wireless communication involving an antenna array, the method comprising:

receiving, from a target communication apparatus for a wireless communication apparatus, a signal including antenna array geometry information of the target communication apparatus and receiving a training sequence signal;

determining geometry configuration of the antenna array of the target communication apparatus based on the signal;

estimating channel characteristic of a channel from the target communication apparatus to the wireless communication apparatus based on the training sequence signal; and

determining, based on the geometry configuration of the antenna array of the target communication apparatus and channel estimation result, channel feedback information indicating the channel characteristic of the channel from the target communication apparatus to the wireless communication apparatus, wherein

the antenna array geometry information indicates at least one of positional relationship among antenna elements in the antenna array, spacing between the antenna elements, and antenna polarization direction.

11. A wireless communication apparatus which participates in wireless communication involving an antenna array, comprising:

processing circuitry configured to

receive, from a target communication apparatus for the wireless communication apparatus, a signal including antenna array geometry information of the target communication apparatus and receive a training sequence signal from the target communication apparatus;

determine geometry configuration of the antenna array of the target communication apparatus based on the signal;

estimate channel characteristic of a channel from the target communication apparatus to the wireless communication apparatus based on the training sequence signal; and

determine, based on the geometry configuration of the antenna array and channel estimation result from the channel estimation unit, channel feedback information indicating the channel characteristic of the channel from the target communication apparatus to the wireless communication apparatus,

transmit the channel feedback information to the target communication apparatus, and

wherein the antenna array geometry information indicates at least one of positional relationship among antenna elements in the antenna array, spacing between the antenna elements, and antenna polarization direction.

12. The method according to claim 10 , further comprising:

determining a feedback codebook corresponding to the geometry configuration of the antenna array based on the geometry configuration of the antenna array; and

determining a codeword which matches the channel estimation result in the feedback codebook, and includes an index number of the codeword in the channel feedback information.

13. The method according to claim 12 , wherein determining the feedback codebook comprises accessing a memory of the wireless communication apparatus configured to store a plurality of feedback codebooks corresponding to a plurality of antenna array geometry configurations.

14. The method according to claim 12 , wherein the feedback codebook includes a precoding matrix codebook.

15. The method according to claim 10 , wherein

the channel characteristic of the channel from the target communication apparatus to the wireless communication apparatus which is estimated includes at least one of short-term channel characteristic and long-term channel characteristic.

16. The method according to claim 10 , further comprising:

estimating short-term channel characteristic of the channel from the target communication apparatus to the wireless communication apparatus based on the training sequence signal; and

estimating long-term channel characteristic of the channel from the target communication apparatus to the wireless communication apparatus based on the short-term channel characteristic and the geometry configuration of the antenna array of the target communication apparatus.

17. The method according to claim 16 , further comprising:

determining, based on short-term channel estimation values for a plurality of antenna pairs having the same relative geometry relationship in the antenna array, long-term channel information estimation value for at least one of the plurality of antenna pairs, in order to estimate the long-term channel characteristic of the channel from the target communication apparatus to the wireless communication apparatus, wherein

each antenna pair includes a first antenna element and a second antenna element, and there is a same geometry relationship between the first antenna element and the second antenna element included in each of the plurality of antenna pairs having the same relative geometry relationship in the antenna array.

18. The method according to claim 17 , wherein the relative geometry relationship between the first antenna element and the second antenna element includes spatial position deviation and polarization direction deviation.

19. The method according to claim 10 , further comprising:

transmitting configuration information of the antenna array of the wireless communication apparatus to the target communication apparatus, wherein the configuration information of the antenna array includes the number of antenna elements of the wireless communication apparatus or antenna array geometry information of the wireless communication apparatus.