MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM AND COMMUNICATION METHOD OF ADAPTABLY TRANSFORMING CODEBOOK

• US 20100098144A1
• Filed: 10/19/2009
• Published: 04/22/2010
• Est. Priority Date: 10/20/2008
• Status: Active Grant

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Ki II, Park, Sung Woo, Hwang, Keun Chui, CLERCKX, Bruno
• Granted Patent: US 8,649,455 B2
• Time in Patent Office: Days
• US Class Current: 375/224
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0224 using sounding signals

Abstract

A multiple input multiple output (MIMO) communication system including a base station and at least one terminal may adaptively transform a codebook. The terminal may calculate one or more correlation matrices based on one or more subchannel matrices included in a channel matrix. The terminal may feed back information for the base station to reconstruct the one or more correlation matrices. The terminal may transform a codebook stored in the memory of the terminal, based on the one or more correlation matrices. The base station may verify the one or more correlation matrices using the information for the base station to reconstruct the one or more correlation matrices. The base station may transform a codebook stored in the memory of the base station such that the transformed base station codebook is the same as the transformed terminal codebook.

Claims

1. A communication method of a receiver, comprising:

calculating a channel matrix between the receiver and a transmitter;

calculating one or more correlation matrices corresponding to the channel matrix between the receiver and the transmitter; and

feeding back information for the transmitter to recognize the one or more correlation matrices.

2. The method of claim 1, wherein the calculating a channel matrix further comprise decomposing the channel matrix into at least two subchannels, and the calculating comprises calculating at least two correlation matrices that correspond to the at least two subchannel matrices.

3. The method of claim 2, wherein the decomposing comprises decomposing the channel matrix into the at least two subchannel matrices is based on at least one of the polarization of one or more transmit antennas installed in the transmitter, and the polarization of one or more receive antennas installed in the receiver.

4. The method of claim 1, further comprising:

decomposing each of the one or more correlation matrices into a plurality of sub blocks;

normalizing a power of the sub blocks included in each of the one or more correlation matrices using normalization factors; and

feeding back to the transmitter information associated with the normalization factors.

5. The method of claim 4, further comprising:

unifying the normalization factors into at least one value to generate information associated with the normalization factors.

6. The method of claim 2, further comprising:

generating information for the transmitter to reconstruct the at least two correlation matrices that are associated with a plurality of sub blocks included in each of the at least two correlation matrices.

7. The method of claim 6, wherein the generating comprises calculating a sum or an average between a plurality of sub blocks included in a particular correlation matrix, and another plurality of sub blocks included in at least one other correlation matrix, to generate information for the transmitter to reconstruct the at least two correlation matrices.

8. The method of claim 6, wherein the generating comprises generating information for the transmitter to reconstruct the at least two correlation matrices using a symmetry of each of the at least two correlation matrices.

9. The method of claim 1, wherein the feeding back comprises feeding back information for the transmitter to reconstruct the one or more correlation matrices so that the transmitter transforms a first codebook to a second codebook.

10. The method of claim 1, further comprising:

transforming a first codebook to a second codebook using the one or more correlation matrices.

11. The method of claim 10, further comprising:

selecting a preferred vector or a preferred matrix using the second codebook; and

feeding back to the transmitter information associated with the preferred vector or the preferred matrix.

12. A communication method of a transmitter, comprising:

receiving information for the transmitter to reconstruct one or more correlation matrices corresponding to a channel matrix between a receiver and the transmitter;

recognizing the one or more correlation matrices using the information received for the transmitter to reconstruct the one or more correlation matrices; and

transforming a first codebook to a second codebook using the one or more correlation matrices.

13. The method of claim 12, further comprising:

generating a precoding matrix using the second codebook.

14. The method of claim 12, wherein the receiving comprises receiving information for the transmitter to reconstruct at least two correlation matrices corresponding to at least two subchannel matrices included in a channel matrix, and the recognizing comprises recognizing the at least two correlation matrices.

15. The method of claim 14, wherein the recognizing comprises recognizing the at least two correlation matrices using a symmetry of each of the at least two correlation matrices.

16. The method of claim 14, wherein the information for the transmitter to reconstruct the at least two correlation matrices is associated with a sum or an average between a plurality of sub blocks, included in a particular correlation matrix, and another plurality of sub blocks, included in at least one other correlation matrix.

17. The method of claim 12, further comprising:

receiving information associated with normalization factors that are used to normalize a plurality of sub blocks included in each of the one or more correlation matrices.

18. The method of claim 17, wherein information associated with the normalization factors is associated with at least one value used to unify the normalization factors.

19. A computer-readable recording medium storing a program to implement a method comprising:

calculating a channel matrix between a receiver and a transmitter;

calculating one or more correlation matrices corresponding to the channel matrix between the receiver and the transmitter; and

feeding back information for the transmitter to recognize the one or more correlation matrices.

20. A receiver comprising:

a channel matrix calculator to calculate a channel matrix;

a correlation matrix calculator to calculate one or more correlation matrices corresponding to the channel matrix between the receiver and a transmitter; and

a feedback unit to feed back information for the transmitter to reconstruct the one or more correlation matrices.

21. The receiver of claim 20, wherein the channel matrix calculator calculates a channel matrix and decomposes the channel matrix into at least two subchannel matrices.

22. The receiver of claim 20, further comprising:

a power normalization unit to normalize a power of sub blocks included in each of the one or more correlation matrices using normalization factors,

wherein the feedback unit feeds back information associated with the normalization factors.

23. The receiver of claim 20, further comprising:

an information generator to generate information for the transmitter to reconstruct the one or more correlation matrices that are associated with a plurality of sub blocks included in each of the one or more correlation matrices.

24. The receiver of claim 20, further comprising:

a codebook transformation unit to transform a first codebook to a second codebook using the one or more correlation matrices.

25. The receiver of claim 24, further comprising:

a selector to select a preferred vector or a preferred matrix using the second codebook,

wherein the feedback unit feeds back, to the transmitter, information associated with the preferred vector or the preferred matrix.

26. The receiver of claim 24, wherein, where codewords included in the first codebook include at least two vectors, the codebook transformation unit transforms the first codebook to the second codebook by making at least two correlation matrices of the one or more correlation matrices, correspond to the at least two vectors.

27. A transmitter comprising:

an information receiver to receive information for the transmitter to reconstruct one or more correlation matrices corresponding to a channel matrix between a receiver and the transmitter;

a correlation matrix recognition unit to recognize the one or more correlation matrices using the information for the transmitter to reconstruct the one or more correlation matrices; and

a codebook transformation unit to transform a first codebook to a second codebook using the at least two correlation matrices.

28. The transmitter of claim 27, further comprising:

a precoder to generate a precoding matrix using the second codebook.

29. The transmitter of claim 27, wherein, where codewords included in the first codebook include at least two vectors, the codebook transformation unit transforms the first codebook to the second codebook by making at least two correlation matrices of the one or more correlation matrices, correspond to the at least two vectors, respectively.