METHOD FOR TRANSMITTING DATA IN MULTIPLE ANTENNA SYSTEM

• US 20110128917A1
• Filed: 07/29/2009
• Published: 06/02/2011
• Est. Priority Date: 07/30/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ko, Hyun Soo, Ihm, Bin Chul, Lee, Moon Il, Chun, Jin Young, Lee, Wook Bong
• Granted Patent: US 8,553,620 B2
• Time in Patent Office: Days
• US Class Current: 370/328
• CPC Class Codes: H04B 7/0413 MIMO systems

Abstract

A method for transmitting data in a multiple antenna system comprises the steps of: generating a transmission signal in plural antennas through the application of a precoding eight matrix to first and second antenna clusters including the plural antennas, and transmitting the transmission signal. The precoding weight matrix is a block diagonal matrix that is configured in a precoding weight corresponding to first and second antenna clusters respectively. The precoding weight of the first antenna cluster is selected according to a channel condition, and the precoding weight of the second antenna cluster is selected regardless of the channel condition but according to a rule.

Claims

1. A data transmission method in a multiple antenna system, comprising:

generating a transmit (Tx) signal in a plurality of antennas by applying a precoding weight matrix to a first and second antenna clusters including the plurality of antennas, wherein the precoding weight matrix is a block diagonal matrix that is configured with precoding weights corresponding to the first and second antenna clusters respectively, and the precoding weight of the first antenna cluster is selected according to a channel condition, and the precoding weight of the second antenna cluster is selected according to a specific rule irrespective of the channel condition; and

transmitting the Tx signal.

2. The data transmission method of claim 1, wherein the precoding weight is a P*V precoding matrix when P denotes the number of Tx antennas included in the antenna cluster and V denotes the number of layers applied to the antenna cluster (where P and V are integers satisfying P, V>

0).

3. The data transmission method of claim 1, wherein the Tx signal is generated by applying an antenna switching matrix, which is used to map the first antenna cluster and the second antenna cluster to a physical antenna, to the precoding weight matrix.

4. The data transmission method of claim 1, further comprising receiving a precoding matrix indicator (PMI) for selection of the precoding weight of the first antenna cluster.

5. The data transmission method of claim 1, wherein a whole frequency band includes a plurality of subbands each including a plurality of subcarriers, and the precoding weight of the second antenna cluster is applied to each subband.

6. The data transmission method of claim 5, wherein the precoding weight of the first antenna cluster is applied to the whole frequency band or the subband.

7. The data transmission method of claim 1, wherein the first antenna cluster and the second antenna cluster are combined using a phase vector, and the precoding weight matrix is used for virtual antenna transmission.

8. A data transmission method in a multiple antenna system, comprising:

receiving a receive (Rx) signal from a transmitter including first and second antenna clusters configured by aggregating a plurality of antennas in a plurality of groups, wherein a precoding weight of the first antenna cluster is selected according to a channel condition, and a precoding weight of the second antenna cluster is selected according to a specific rule irrespective of the channel condition; and

transmitting feedback data including a precoding matrix indicator (PMI) for the first antenna cluster by estimating a channel for the Rx signal.

9. The data transmission method of claim 8, wherein signals received from the first antenna cluster and the second antenna cluster have different ranks to each other.