Method for determining precoding matrix indicator, receiving device, and sending device

1. A non-transitory computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to execute a method for determining a precoding matrix indicator, wherein the method comprising:

selecting, by a receive end of a wireless communication system, a precoding matrix W from a codebook based on a reference signal sent by a transmit end of the wireless communication system, wherein the precoding matrix W is a product of a matrix W1 and a matrix W2 wherein

the W1 comprises N B block matrices X i , N B ≥1, and the W1 is indicated as: W1=diag{X 1 , . . . , X N B }, wherein 1≤i≤N B , and a column x i,j of each block matrix X i is a Kronecker product of a first vector A ij and a second vector B ij , that is, x ij =A ij ⊗B ij ; and

sending, by the receive end of the wireless communication system, a precoding matrix indicator (PMI) corresponding to the precoding matrix W to the transmit end of the wireless communication system, so that the transmit end of the wireless communication system obtains the precoding matrix W according to the PMI.

2. The non-transitory computer-readable storage medium according to claim 1 , wherein

all columns of the block matrix X i are obtained by pairwisely successively calculating Kronecker products of N1 consecutive first vectors and N2 consecutive second vectors.

3. The non-transitory computer-readable storage medium according to claim 2 , wherein N1 is greater than or equal to N2.

4. The non-transitory computer-readable storage medium according to claim 1 , wherein

for any two adjacent block matrices X i and X i+1 , if second vectors that constitute the X i and the X i+1 are N2 same consecutive second vectors, wherein N2 is greater than 0, there are s1 same first vectors in two groups of first vectors that constitute the X i and the X i+1 , and s1 is greater than or equal to 0; and

for any two adjacent block matrices X i and X i+1 , if first vectors that constitute the X i and the X i+1 are N1 same consecutive first vectors, wherein N1 is greater than 0, there are s2 same second vectors in two groups of second vectors that constitute the X i and the X i+1 , and s2 is greater than or equal to 0.

5. The non-transitory computer-readable storage medium according to claim 4 , wherein s1 is greater than or equal to s2.

6. A non-transitory computer-readable storage medium comprising instructions which, when executed by a computer, cause the computer to execute a method for determining a precoding matrix, wherein the method comprising:

sending, by a transmit end of a wireless communication system, a reference signal to a receive end of the wireless communication system;

receiving, by the transmit end of the wireless communication system, a precoding matrix indicator (PMI) sent by the receive end of the wireless communication system; and

determining, by the transmit end of the wireless communication system according to the PMI, a precoding matrix W selected by the receive end of the wireless communication system from a codebook based on the reference signal, wherein the precoding matrix W is a product of a matrix W1 and a matrix W2, wherein

the W1 comprises N B block matrices X i , N B ≥1, and the W 1 is indicated as: W1=diag{X 1 , . . . , X N B }, wherein 1≤i≤N B , and a column x i,j of each block matrix X i is a Kronecker product of a first vector A ij and a second vector B ij , that is, x ij =A ij ⊗B ij .

7. The non-transitory computer-readable storage medium according to claim 6 , wherein

all columns of the block matrix X i are obtained by pairwisely successively calculating Kronecker products of N1 consecutive first vectors and N2 consecutive second vectors.

8. The non-transitory computer-readable storage medium according to claim 7 , wherein N1 is greater than or equal to N2.

9. The non-transitory computer-readable storage medium according to claim 6 , wherein

for any two adjacent block matrices X i and X i+1 , if second vectors that constitute the X i and the X i+1 are N2 same consecutive second vectors, wherein N2 is greater than 0, there are s1 same first vectors in two groups of first vectors that constitute the X i and the X i+1 , and s1 is greater than or equal to 0; and

for any two adjacent block matrices X i and X i+1 , if first vectors that constitute the X i and the X i+1 are N1 same consecutive first vectors, wherein N1 is greater than 0, there are s2 same second vectors in two groups of second vectors that constitute the X i and the X i+1 , and s2 is greater than or equal to 0.

10. The non-transitory computer-readable storage medium according to claim 9 , wherein s1 is greater than or equal to s2.

11. A method for determining a precoding matrix, comprising:

sending, by a transmit end of a wireless communication system, a reference signal to a receive end of the wireless communication system;

receiving, by the transmit end of the wireless communication system, a precoding matrix indicator (PMI) sent by the receive end of the wireless communication system; and

determining, by the transmit end of the wireless communication system according to the PMI, a precoding matrix W selected by the receive end from a codebook based on the reference signal, wherein the precoding matrix W is a product of a matrix W1 and a matrix W2, wherein

the W1 comprises N B block matrices X i , N B ≥1 and the W 1 is indicated as: W1=diag{X 1 , . . . , X N B }, 1≤i≤N B , and a column x i,j of each block matrix X i is a Kronecker product of a first vector A ij and a second vector B ij , that is, x ij =A ij ⊗B ij .

12. The method according to claim 11 , wherein

all columns of the block matrix X i are obtained by pairwisely successively calculating Kronecker products of N1 consecutive first vectors and N2 consecutive second vectors.

13. The method according to claim 12 , wherein N1 is greater than or equal to N2.

14. The method according to claim 11 , wherein

for any two adjacent block matrices X i and X i+1 , if second vectors that constitute the X i and the X i+1 are N2 same consecutive second vectors, wherein N2 is greater than 0, there are s1 same first vectors in two groups of first vectors that constitute the X i and the X i+1 , and s1 is greater than or equal to 0; and

for any two adjacent block matrices X i and X i+1 , if first vectors that constitute the X i and the X i+1 are N1 same consecutive first vectors, wherein N1 is greater than 0, there are s2 same second vectors in two groups of second vectors that constitute the X i and the X i+1 , and s2 is greater than or equal to 0.

15. The method according to claim 14 , wherein s1 is greater than or equal to s2.