TRANSMITTING DEVICE AND A METHOD OF COMMUNICATING THEREWITH, AND RECEIVING DEVICE AND A METHOD OF COMMUNICATING THEREWITH

• US 20130114763A1
• Filed: 07/01/2011
• Published: 05/09/2013
• Est. Priority Date: 07/05/2010
• Status: Active Grant

• Current Assignee: Pantech Corporation (Ideahub, Inc.)
• Original Assignee: Pantech Co. Ltd. (Pantech Incorporated)
• Inventors: Park, Kyoungmin
• Granted Patent: US 9,136,924 B2
• Time in Patent Office: Days
• US Class Current: 375/296
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0469 taking special antenna structures, e.g. cross polarized antennas into account
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]

Abstract

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.

Claims

1. A communication method of a transmitting device including a first precoder and a second precoder, the method comprising:

determining first information to restrict a precoding matrix from being used as a first precoding matrix of the first precoder, and second information to restrict a precoding matrix from being used as the second precoding matrix of a second precoder in a corresponding codebook with respect to each layer; and

transmitting, to a receiving device, codebook restricting information including at least one of the determined first information and second information.

2. The method of claim 1, further comprising:

receiving, from the receiving device, 1^st channel status information indicating a first precoding matrix and 2^nd channel status information indicating a second precoding matrix, the first precoding matrix and the second precoding matrix selected by the receiving device based on the codebook restricting information; and

precoding data symbols through the first precoder and the second precoder using the first precoding matrix corresponding to the received 1^st channel status information and the second precoding matrix corresponding to the second status information, and transmitting the precoded data symbols.

3. The method of claim 1, wherein the first information and the second information are provided in a bitmap format.

4. The method of claim 1, wherein the use of second precoding matrices that make pairs with the first precoding matrix is restricted based on the first information, and the use of first precoding matrices that make pairs with the second precoding matrix is restricted.

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 first precoding matrix performs precoding on the first domain and the second domain, separately, and the second precoding matrix 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 first precoding matrix corresponds to W1 in the following Equation, and the second precoding matrix corresponds to W2 in the following Equation:

7. The method of claim 5, wherein a number of the antenna pairs corresponds to 4.

8. The method of claim 2, wherein, in receiving of the 1^st channel status information and the 2^nd channel status information, a period of receiving the 1^st channel status information and a period of receiving the 2^nd channel status information are different from each other.

9. The method of claim 8, wherein the period of receiving the 1^st channel status information is longer than the period of receiving the 2^nd channel status information.

10. A transmitting device, the device comprising:

a layer mapper to map a codeword to a layer;

a precoder including a first precoder and a second precoder that performs precoding on a data symbol corresponding to the codeword mapped to the layer by the layer mapper, using a first precoding matrix and a second precoding matrix selected from a corresponding codebook; and

an antenna array to transmit signals output from the precoder,

wherein the codeword includes at least one of first information to restrict a precoding matrix from being used as the first precoding matrix and second information to restrict a precoding matrix from being used as the second precoding matrix in the corresponding codebook with respect to each layer.

11. The device of claim 10, wherein the antenna array receives 1^st channel status information indicating a first precoding matrix and 2^nd channel status information indicating a second precoding matrix;

and

the first precoder and the second precoder perform precoding on data symbols using the first precoding matrix corresponding to the received 1^st channel status information and the second precoding matrix corresponding to the received 2^nd channel status information, respectively.

12. The device of claim 10, wherein the first information and the second information are provided in a bitmap format.

13. The device of claim 10, wherein the use of second precoding matrices that make pairs with the first precoding matrix is restricted based on the first information, and the use of first precoding matrices that make pairs with the second precoding matrix is restricted based on the second information.

14. The device of claim 10, 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 first precoding matrix performs precoding on the first domain and the second domain, separately, and the second precoding matrix performs phase mismatch correction to remove an effect from a phase mismatch between the first domain and the second domain.

15. The device of claim 14, wherein the first precoding matrix corresponds to W1 in the following Equation, and the second precoding matrix corresponds to W2 in the following Equation:

16. The device of claim 14, wherein the first domain and the second domain intersect each other.

17. The device of claim 14, wherein a number of the antenna pairs corresponds to 4.

18. A communication method of a receiving device in a wireless communication system, the method comprising:

receiving codebook restricting information including at least one of first information to restrict a precoding matrix from being used as a first precoding matrix and second information to restrict a precoding matrix from being used as a second precoding matrix for each layer; and

transmitting, to a transmitting device, 1^st channel status information indicating a first precoding matrix and 2^nd channel status information indicating a second precoding matrix, the first precoding matrix and the second precoding matrix being selected, based on the codebook restricting information, from among precoding matrices that are not restricted from being used as the first precoding matrix or the second precoding matrix in a codebook.

19. The method of claim 18, wherein the first information and the second information are provided in a bitmap format.

20. The method of claim 18, wherein the use of second precoding matrices that make pairs with the first precoding matrix is restricted based on the first information and the use of first precoding matrices that make pairs with the second precoding matrix is restricted based on the second information.

21. The method of claim 18, 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 first precoding matrix performs precoding on the first domain and the second domain, separately, and the second precoding matrix performs phase mismatch correction to remove an effect from a phase mismatch between the first domain and the second domain.

22. The method of claim 21, wherein the first precoding matrix corresponds to W1 in the following Equation and the second precoding matrix corresponds to W1 in the following Equation:

23. The method of claim 18, wherein, in transmitting, a period of transmitting the 1^st channel status information and a period of transmitting the 2^nd channel status information are different from each other.

24. The method of claim 23, wherein the period of transmitting the 1^st channel status information is longer than the period of transmitting the 2^nd channel status information.

25. A receiving device in a wireless communication system, the device comprising:

an antenna array to receive, as codebook restricting information, at least one of first information to restrict a precoding matrix from being used as a first precoding matrix and first information to restrict a precoding matrix from being used as a second precoding matrix with respect to each layer; and

a channel information feedback device to transmit, to a transmitting device, 1^st channel status information indicating a first precoding matrix and 2^nd channel status information indicating a second precoding matrix, the first precoding matrix and the second precoding matrix being selected, based on the codebook restricting information, from among precoding matrices that are not restricted from being used as the first precoding matrix of the second precoding matrix in a codebook.

26. The device of claim 25, wherein the first information and the second information are provided in a bitmap format.

27. The device of claim 25, wherein the use of second precoding matrices that make pairs with the first precoding matrix is restricted based on the first information and the use of first precoding matrices that make pairs with the second precoding matrix is restricted based on the second information.

28. The device of claim 25, 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 first precoding matrix performs precoding on the first domain and the second domain, separately, and the second precoding matrix performs phase mismatch correction to remove an effect from a phase mismatch between the first domain and the second domain.

29. The device of claim 28, wherein the first precoding matrix corresponds to W1 in the following Equation, and the second precoding matrix corresponds to W2 in the following Equation:

30. The device of claim 25, wherein a period of transmitting the 1^st channel status information and a period of transmitting the 2^nd channel status information are different from each other.

31. The device of claim 30, wherein the period of transmitting the 1^st channel status information is longer than the period of transmitting the 2^nd channel status information.