Method for transmitting data in multiple antenna system

• US 8,553,620 B2
• Filed: 07/29/2009
• Issued: 10/08/2013
• Est. Priority Date: 07/30/2008
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ko, Hyun Soo, Chun, Jin Young, Lee, Moon Il, Ihm, Bin Chul, Lee, Wook Bong
• Primary Examiner(s): Wong, Xavier S.
• Assistant Examiner(s): Rahman, M Mostazir
• Application Number:
  US13/056,306
• Publication Number:
  US 20110128917A1
• Time in Patent Office: 1,532 Days
• Field of Search: 370203-210, 370328-342
• 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, the method comprising:

generating a transmit (Tx) signal in a plurality of antennas by applying a precoding weight matrix to first and second antenna clusters including the plurality of antennas, wherein;

the precoding weight matrix is a block diagonal matrix that is configured with a precoding weight corresponding to the first antenna cluster and a precoding weight corresponding to the second antenna cluster;

the precoding weight corresponding to the first antenna cluster is selected according to a channel condition; and

the precoding weight corresponding to the second antenna cluster is different from the precoding weight corresponding to the first antenna cluster and is selected according to a specific rule irrespective of the channel condition in order to receive feedback data for only the first antenna cluster, the feedback data including a precoding matrix indicator (PMI);

transmitting the Tx signal; and

receiving the PMI for selection of the precodinq weight corresponding to the first antenna cluster,

wherein;

a whole frequency band includes a plurality of subbands each including a plurality of subcarriers; and

the precodinq weight corresponding to the second antenna cluster is applied to each of the plurality of subbands.

2. The data transmission method of claim 1, wherein:

the precoding weight corresponding to the first antenna cluster or the precoding weight corresponding to the second antenna cluster is a P*V precoding matrix where P denotes a number of Tx antennas included in the first or second antenna cluster and V denotes a number of layers applied to the first or second antenna cluster; and

P and V are integers that are greater than 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, wherein the precoding weight corresponding to the first antenna cluster is applied to the whole frequency band or the plurality of subbands.

5. 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.