Transmitting device and a method of communicating therewith, and receiving device and a method of communicating therewith
View Patent ↗An embodiment of the present invention relates to a wireless communication system, and more specifically relates to a wireless communication system using multi-input and multi-output (MIMO) antennas in all transmission and reception terminals.
1. A communication method of a transmitting device including a first precoder and a second precoder, the method comprising:
determining a first bit sequence to restrict at least one precoding matrix from a first precoding matrix group, each bit of the first bit sequence corresponding to one precoding matrix of the first precoding matrix group, respectively, and the at least one precoding matrix of the first precoding matrix group being restricted from being used as a precoding matrix of the first precoder;
determining a second bit sequence to restrict at least one precoding matrix from a second precoding matrix group, each bit of the second bit sequence corresponding to one precoding matrix of the second precoding matrix group, respectively, and the at least one precoding matrix of the second precoding matrix group being restricted from being used as a precoding matrix of the second precoder; and
transmitting, to a receiving device, codebook restricting information including at least one of the first bit sequence and the second bit sequence,
receiving, from the receiving device, information relating to the precoding matrix of the first precoder and information relating to the precoding matrix of the second precoder, and
wherein a period of receiving the information relating to the precoding matrix of the first precoder and a period of receiving the information relating to the precoding matrix of the second precoder are different from each other.
2. The method of claim 1 , further comprising:
precoding data symbols through the first precoder and the second precoder using the precoding matrix of the first precoder and the precoding matrix of the second precoder; and
transmitting the precoded data symbols,
wherein the information relating to the precoding matrix of the first precoder and the information relating to the precoding matrix of the second precoder correspond to channel status information.
3. The method of claim 1 , wherein the first matrix group includes N precoding matrices, and the first bit sequence is an N-bit sequence, where N is an integer.
4. The method of claim 1 , wherein the use of precoding matrices for the second precoder that make pairs with restricted precoding matrices of the first matrix group is restricted based on the first bit sequence, and the use of precoding matrices for the first precoder that make pairs with restricted precoding matrices of the second matrix group is restricted based on the second bit sequence.
5. The method of claim 1 , wherein the transmitting device includes at least one antenna pair in which a first domain including at least one antenna polarized in one direction and a second domain including at least one antenna polarized in another direction intersect each other; and
the precoding matrix of the first precoder performs precoding on the first domain and the second domain, separately, and the precoding matrix of the second precoder performs phase mismatch correction to remove an effect from a phase mismatch between the first domain and the second domain.
6. The method of claim 5 , wherein the precoding matrix of the first precoder corresponds to W1 in the following Equation, and the precoding matrix of the second precoder corresponds to W2 in the following Equation:
W
=
(
R
0
0
0
R
0
)
︸
W
1
(
I
Λ
)
︸
W
2
,
wherein R 0 denotes a value determined by a precoding gain when the first domain and the second domain have an identical spatial channel status, I denotes a unit matrix, and Λ denotes a phase mismatch correction value between the first domain and the second domain.
7. The method of claim 5 , wherein a number of the antenna pairs corresponds to 4.
8. The method of claim 1 , wherein the period of receiving the information relating to the precoding matrix of the first precoder is longer than the period of receiving the information relating to the precoding matrix of the second precoder.
9. A transmitting device, the device comprising:
a layer mapper to map a codeword to a layer;
a precoder configured to precode a data symbol corresponding to the codeword mapped to the layer by the layer mapper, the precoder precoding the data symbol using a precoding matrix of a first precoder and a precoding matrix of a second precoder selected from corresponding codebooks; and
an antenna array to transmit, to a receiving device, at least one of a first bit sequence and a second bit sequence, to receive, from the receiving device, information relating to the precoding matrix of the first precoder and information relating to the precoding matrix of the second precoder, and to transmit signals output from the precoder,
wherein the first bit sequence restricts at least one precoding matrix from a first precoding matrix group, the at least one precoding matrix of the first precoding matrix group being restricted from being used as the precoding matrix of the first precoder,
wherein the second bit sequence restricts at least one precoding matrix from a second precoding matrix group, the at least one precoding matrix of the second precoding matrix group being restricted from being used as the precoding matrix of the second precoder,
wherein each bit of the first bit sequence corresponds to one precoding matrix of the first precoding matrix group, respectively, and each bit of the second bit sequence corresponds to one precoding matrix of the second precoding matrix group, respectively, and
wherein a period of receiving the information relating to the precoding matrix of the first precoder and a period of receiving the information relating to the precoding matrix of the second precoder are different from each other.
10. The device of claim 9 , wherein the information relating to the precoding matrix of the first precoder and the information relating to the precoding matrix of the second precoder correspond to channel status information.
11. The device of claim 9 , wherein the first matrix group includes N precoding matrices, and the first bit sequence is an N-bit sequence, where N is an integer.
12. The device of claim 9 , wherein the use of precoding matrices for the second precoder that make pairs with restricted precoding matrices of the first matrix group is restricted based on the first bit sequence, and the use of precoding matrices for the first precoder that make pairs with restricted precoding matrices of the second matrix group is restricted based on the second bit sequence.
13. The device of claim 9 , wherein the antenna array includes at least one antenna pair in which a first domain including at least one antenna polarized in one direction and a second domain including at least one antenna polarized in another direction intersect each other; and
the precoding matrix of the first precoder performs precoding on the first domain and the second domain, separately, and the precoding matrix of the second precoder performs phase mismatch correction to remove an effect from a phase mismatch between the first domain and the second domain.
14. The device of claim 13 , wherein the precoding matrix of the first precoder corresponds to W1 in the following Equation, and the precoding matrix of the second precoder corresponds to W2 in the following Equation:
W
=
(
R
0
0
0
R
0
)
︸
W
1
(
I
Λ
)
︸
W
2
,
wherein R 0 denotes a value determined by a precoding gain when the first domain and the second domain have an identical spatial channel status, I denotes a unit matrix, and Λ denotes a phase mismatch correction value between the first domain and the second domain.
15. The device of claim 13 , wherein the first domain and the second domain intersect each other.
16. The device of claim 13 , wherein a number of the antenna pairs corresponds to 4.
17. A communication method of a receiving device in a wireless communication system, the method comprising:
receiving codebook restricting information including at least one of a first bit sequence to restrict at least one precoding matrix from a first precoding matrix group and a second bit sequence to restrict at least one precoding matrix from a second precoding matrix group, each bit of the first bit sequence corresponding to one precoding matrix of the first precoding matrix group, respectively, the at least one precoding matrix of the first precoding matrix group being restricted from being used as a precoding matrix of a first precoder, each bit of the second bit sequence corresponding to one precoding matrix of the second precoding matrix group, respectively, and the at least one precoding matrix of the second precoding matrix group being restricted from being used as a precoding matrix of a second precoder; and
transmitting, to a transmitting device, 1 st channel status information indicating the precoding matrix of the first precoder and 2 nd channel status information indicating the precoding matrix of the second precoder, the precoding matrix of the first precoder and the precoding matrix of the second precoder being selected, based on the codebook restricting information, from among precoding matrices that are not restricted,
wherein a period of transmitting the information relating to the precoding matrix of the first precoder and a period of transmitting the information relating to the precoding matrix of the second precoder are different from each other.
18. The method of claim 17 , wherein the first matrix group includes N precoding matrices, and the first bit sequence is an N-bit sequence, where N is an integer.
19. The method of claim 17 , wherein the use of precoding matrices for the second precoder that make pairs with restricted precoding matrices of the first matrix group is restricted based on the first bit sequence, and the use of precoding matrices for the first precoder that make pairs with restricted precoding matrices of the second matrix group is restricted based on the second bit sequence.
20. The method of claim 17 , wherein the transmitting device includes at least one antenna pair in which a first domain including at least one antenna polarized in one direction and a second domain including at least one antenna polarized in another direction intersect each other; and
the precoding matrix of the first precoder performs precoding on the first domain and the second domain, separately, and the precoding matrix of the second precoder performs phase mismatch correction to remove an effect from a phase mismatch between the first domain and the second domain.
21. The method of claim 20 , wherein the precoding matrix of the first precoder corresponds to W1 in the following Equation and the precoding matrix of the second precoder corresponds to W2 in the following Equation:
W
=
(
R
0
0
0
R
0
)
︸
W
1
(
I
Λ
)
︸
W
2
,
wherein R 0 denotes a value determined by a precoding gain when the first domain and the second domain have an identical spatial channel status, I denotes a unit matrix, and Λ denotes a phase mismatch correction value between the first domain and the second domain.
22. The method of claim 17 , wherein the period of transmitting the information relating to the precoding matrix of the first precoder is longer than the period of transmitting the information relating to the precoding matrix of the second precoder.
23. A receiving device in a wireless communication system, the receiving device comprising:
an antenna array to receive, as codebook restricting information, at least one of a first bit sequence to restrict at least one precoding matrix from a first precoding matrix group and a second bit sequence to restrict at least one precoding matrix from a second precoding matrix group, each bit of the first bit sequence corresponding to one precoding matrix of the first precoding matrix group, respectively, the at least one precoding matrix of the first precoding matrix group being restricted from being used as a precoding matrix of a first precoder, each bit of the second bit sequence corresponding to one precoding matrix of the second precoding matrix group, respectively, and the at least one precoding matrix of the second precoding matrix group being restricted from being used as a precoding matrix of a second precoder; and
a channel information feedback device to transmit, to a transmitting device, information relating to the precoding matrix of the first precoder and information relating to the precoding matrix of the second precoder, the precoding matrix of the first precoder and the precoding matrix of the second precoder being selected, based on the codebook restricting information, from among precoding matrices that are not restricted,
wherein a period of transmitting the information relating to the precoding matrix of the first precoder and a period of transmitting the information relating to the precoding matrix of the second precoder are different from each other.
24. The device of claim 23 , wherein the first matrix group includes N precoding matrices, and the first bit sequence is an N-bit sequence, where N is an integer.
25. The device of claim 23 , wherein the use of precoding matrices for the second precoder that make pairs with restricted precoding matrices of the first matrix group is restricted based on the first bit sequence, and the use of precoding matrices for the second precoder that make pairs with restricted precoding matrices of the second matrix group is restricted based on the second bit sequence.
26. The device of claim 23 , wherein the transmitting device includes at least one antenna pair in which a first domain including at least one antenna polarized in one direction and a second domain including at least one antenna polarized in another direction intersect each other; and
the precoding matrix of the first precoder performs precoding on the first domain and the second domain, separately, and the precoding matrix of the second precoder performs phase mismatch correction to remove an effect from a phase mismatch between the first domain and the second domain.
27. The device of claim 26 , wherein the precoding matrix of the first precoder corresponds to W1 in the following Equation, and the precoding matrix of the second precoder corresponds to W2 in the following Equation:
W
=
(
R
0
0
0
R
0
)
︸
W
1
(
I
Λ
)
︸
W
2
,
wherein R 0 denotes a value determined by a precoding gain when the first domain and the second domain have an identical spatial channel status, I denotes a unit matrix, and Λ denotes a phase mismatch correction value between the first domain and the second domain.
28. The device of claim 23 , wherein the period of transmitting the information relating to the precoding matrix of the first precoder is longer than the period of transmitting the information relating to the precoding matrix of the second precoder.