DATA TRANSMITTING AND RECEIVING METHOD USING PHASE SHIFT BASED PRECODING AND TRANSCEIVER SUPPORTING THE SAME

• US 20100014608A1
• Filed: 09/23/2009
• Published: 01/21/2010
• Est. Priority Date: 02/14/2007
• Status: Active Grant

• Current Assignee: Blackberry Limited
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ihm, Bin Chul, Chun, Jin Young, LEE, Moon Il, Lee, Wook Bong
• Granted Patent: US 7,885,349 B2
• Time in Patent Office: Days
• US Class Current: 375/296
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0465 taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/0663 using vector or matrix manipulations
• CPC Class Codes: H04B 7/0671 using different delays between antennas
• CPC Class Codes: H04B 7/0682 using phase diversity (e.g. phase sweeping)
• CPC Class Codes: H04L 1/06 using space diversity
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 25/03898 codebook-based design selection of codebook or precoding matrix for MIMO diversity systems H04B7/0456
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 5/0023 Time-frequency-space

Abstract

A method for performing a precoding based on a generalized phase shift or a precoding based on an extended phase shift in a Multi-Input Multi-Output (MIMO) system employing several sub-carriers, and a transceiver for supporting the same are disclosed. A phase-shift-based precoding matrix is generalized by multiplying a diagonal matrix for a phase shift by a unitary matrix for maintaining orthogonality between sub-carriers. In this case, a diagonal matrix part may be extended by multiplying a precoding matrix for removing interference between sub-carriers by a diagonal matrix for a phase shift. By generalization and extension of the phase-shift-based precoding, a transceiver is more simplified, and communication efficiency increases.

Claims

1-26. -26. (canceled)

27. A method for transmitting data from a transmission end device to a reception end device in a Multi-input Multi-Output (MIMO) system using a plurality of sub-carriers, the method comprising:

determining a precoding matrix as a first part of a phase-shift-based precoding matrix;

determining a first diagonal matrix for a phase shift as a second part of the phase-shift-based precoding matrix;

determining a unitary matrix as a third part of the phase-shift-based precoding matrix; and

precoding by multiplying the phase-shift-based precoding matrix by a transmission symbol according to a resource,

wherein the phase-shift-based precoding matrix is determined by multiplying the precoding matrix, the first diagonal matrix, and the unitary matrix, and

wherein the precoding matrix is selected from only a portion of the precoding matrixes included in a first codebook predetermined between the transmission end device and the reception end device.

28. The method according to claim 27, wherein the precoding matrix is selected from a second codebook which constitutes the portion of the first codebook from which the precoding matrix is selected.

29. The method according to claim 28, wherein the precoding matrix is cyclically selected from the second codebook with a predetermined repetition period with respect to a resource index (k).

30. The method according to claim 29, wherein the precoding matrix is selected from the second codebook according to an index acquired by (k mod N),

wherein (k mod N) is a modulo operation of the resource index (k) based on a number (N) of precoding matrixes included in the second codebook.

31. The method according to claim 27, wherein the phase-shift-based precoding matrix is represented by the following equation:

32. The method according to claim 27, wherein the precoding matrix is selected from the portion of the first codebook without using feedback information received from the reception end device.

33. A transceiver for transmitting data in a Multi-input Multi-Output (MIMO) system using a plurality of sub-carriers, the transceiver comprising:

a precoding-matrix decision module for determining a precoding matrix as a first part of a phase-shift-based precoding matrix, determining a first diagonal matrix for a phase shift as a second part of the phase-shift-based precoding matrix, determining a unitary matrix as a third part of the phase-shift-based precoding matrix, and determining the phase-shift-based precoding matrix by multiplying the precoding matrix, the first diagonal matrix, and the unitary matrix; and

a precoding module for precoding by multiplying the phase-shift-based precoding matrix by a transmission symbol according to a resource,

wherein the precoding-matrix decision module selects the precoding matrix from only a portion of the precoding matrixes included in a first codebook predetermined between a transmission end device and a reception end device.

34. The transceiver according to claim 33, wherein the precoding-matrix decision module selects the precoding matrix from a second codebook which constitutes the portion of the first codebook from which the precoding matrix is selected.

35. The transceiver according to claim 34, wherein the precoding-matrix decision module cyclically selects the precoding matrix from the second codebook with a predetermined repetition period with respect to a resource index (k).

36. The transceiver according to claim 35, wherein the precoding-matrix decision module selects the precoding matrix from the second codebook according to an index acquired by (k mod N),

wherein (k mod N) is a modulo operation of the resource index (k) based on a number (N) of precoding matrixes included in the second codebook.

37. The transceiver according to claim 33, wherein the phase-shift-based precoding matrix is represented by the following equation:

38. The transceiver according to claim 33, wherein the precoding matrix decision module selects the precoding matrix from the portion of the first codebook without using feedback information received from the reception end device.

39. A method for a reception end device receiving a data from a transmission end device in a Multi-input Multi-Output (MIMO) system using a plurality of sub-carriers, the method comprising:

determining a precoding matrix as a first part of a phase-shift-based precoding matrix;

determining a first diagonal matrix for a phase shift as a second part of the phase-shift-based precoding matrix;

determining a unitary matrix as a third part of the phase-shift-based precoding matrix; and

decoding a transmission symbol according to a resource based on the phase-shift-based precoding matrix,

wherein the phase-shift-based precoding matrix is determined by multiplying the precoding matrix, the first diagonal matrix, and the unitary matrix, and

wherein the precoding matrix is selected from only a portion of the precoding matrixes included in a first codebook predetermined between the transmission end device and the reception end device.

40. The method according to claim 39, wherein the precoding matrix is selected from a second codebook which constitutes the portion of the first codebook from which the precoding matrix is selected.

41. The method according to claim 40, wherein the precoding matrix is cyclically selected from the second codebook with a predetermined repetition period with respect to a resource index (k).