Signal processing method in MIMO system and apparatus thereof

• US 8,451,922 B2
• Filed: 03/18/2008
• Issued: 05/28/2013
• Est. Priority Date: 11/27/2002
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Dong-Hi, Sim, Dong-Youn, Seo, Bong-Hoe, Kim
• Primary Examiner(s): Washburn, Daniel
• Assistant Examiner(s): Ghulamali, Qutbuddin
• Application Number:
  US12/050,906
• Publication Number:
  US 20080307295A1
• Time in Patent Office: 1,897 Days
• Field of Search: 375/367, 375/240.24, 375/267, 375/130, 375/136, 714/807
• US Class Current: 375/267
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 1/0002 by adapting the transmission rate
• CPC Class Codes: H04L 1/06 using space diversity

Abstract

Disclosed is a signal processing method and apparatus in MIMO system. In a mobile communication system having a plurality of transmitting antennas, the present invention includes the steps of receiving a feedback signal including status information of at least one channel, segmenting one of the first data blocks to segment into at least one or more of the second data blocks, attaching a CRC to each of the at least one or more of the second data blocks, allocating the at least one or more second data blocks to a plurality of the transmitting antennas, respectively, and transmitting the at least one or more of the second data blocks. In a mobile communication system having a plurality of receiving antennas, the present invention includes the steps of receiving at least one data block including a CRC or dummy bits, acquiring channel status information using the CRC or dummy bits, and transmitting the channel status information.

Claims

1. A method of transmitting data blocks at a transmitting end having M transmit antennas in a multiple input multiple output (MIMO) wireless communication system, M being greater than 1, the method comprising:

selecting N transmit antennas from among the M transmit antennas, wherein N is less than M, wherein the selection is based on feedback information, wherein the selected N transmit antennas are used for transmitting the data blocks, and wherein the other (M−

N) transmit antennas are not used for transmitting the data blocks;

attaching cyclic redundancy check (CRC) to each of the data blocks;

allocating each of the CRC-attached data blocks to each of the selected N transmit antennas; and

transmitting, from the transmitting end to a receiving end, each of the CRC-attached data blocks via each of the selected N transmit antennas,

wherein the CRC is independently attached to each of the data blocks,

wherein the feedback information is based on channel status estimation of the M transmit antennas,

wherein the feedback information includes indices on which the selection of the N transmit antennas is based,

wherein the feedback information is received by the transmitting end from the receiving end,

wherein at least one predetermined signal is transmitted via at least one of the M transmit antennas, and

wherein, if information indicating that a specific predetermined signal, which is transmitted via a specific transmit antenna, is not correctly received by the receiving end is received by the transmitting end from the receiving end, the specific predetermined signal is retransmitted via the specific transmit antenna.

2. The method of claim 1, wherein:

a number of the data blocks is equal to N.

3. The method of claim 1, wherein the at least one predetermined signal is used for the channel status estimation by the receiving end.

4. The method of claim 1, wherein the at least one predetermined signal is transmitted via each of the at least one of the M transmit antennas.

5. The method of claim 1, wherein the at least one of the M transmit antennas via which the at least one predetermined signal is transmitted is at least one of the other (M−

N) transmit antennas.

6. The method of claim 1, wherein the at least one predetermined signal includes dummy bits predefined between the transmitting end and the receiving end.

7. A transmitting end for transmitting data blocks in a multiple input multiple output (MIMO) wireless communication system, the transmitting end comprising:

M transmit antennas, wherein M is greater than 1;

an antenna selection unit for selecting N transmit antennas from among the M transmit antennas, wherein the selection is based on feedback information, wherein the selected N transmit antennas are used for transmitting the data blocks, and wherein the other (M−

N) transmit antennas are not used for transmitting the data blocks;

a data segmentation unit for attaching cyclic redundancy check (CRC) to each of the data blocks;

a data block allocation unit for allocating each of the CRC-attached data blocks to each of the selected N transmit antennas; and

a transmitting unit for transmitting, from the transmitting end to a receiving end, each of the CRC-attached data blocks via each of the selected N transmit antennas,

wherein the CRC is independently attached to each of the data blocks,

wherein the feedback information is based on channel status estimation of the M transmit antennas,

wherein the feedback information includes indexes on which the selection of the N transmit antennas is based,

wherein the feedback information is received by the transmitting end from the receiving end,

wherein at least one predetermined signal is transmitted via at least one of the M transmit antennas, and

wherein, if information indicating that a specific predetermined signal, which is transmitted via a specific transmit antenna, is not correctly received by the receiving end is received by the transmitting end from the receiving end, the specific predetermined signal is retransmitted via the specific transmit antenna.

8. The transmitting end of claim 7, wherein:

a number of the data blocks is equal to N.

9. A method of receiving data blocks at a receiving end in a multiple input multiple output (MIMO) wireless communication system, the method comprising:

receiving cyclic redundancy check (CRC)-attached data blocks, wherein a CRC is independently attached to each of the data blocks;

estimating channel status of M transmit antennas of a transmitting end, wherein M is greater than 1; and

transmitting, by the receiving end, feedback information based on the estimated channel status to facilitate selecting N transmit antennas from among the M transmit antennas for use in transmitting data blocks, such that the other (M−

N) transmit antennas are not for use in transmitting data blocks,

wherein the feedback information includes indexes to facilitate the selection of the N transmit antennas,

wherein at least one predetermined signal is received via at least one of the M transmit antennas, and

wherein, if information indicating that a specific predetermined signal, which is transmitted via a specific transmit antenna, is not correctly received by the receiving end is transmitted by the receiving end to the transmitting end, the specific predetermined signal is re-received via the specific transmit antenna.

10. The method of claim 9, wherein:

a number of the transmitted data blocks is to be equal to N.

11. The method of claim 9, wherein the at least one predetermined signal is used for the estimation of the channel status.

12. The method of claim 9, wherein the at least one predetermined signal is received via each of the at least one of the M transmit antennas.

13. The method of claim 9, wherein the at least one of the M transmit antennas via which the at least one predetermined signal is received is at least one of the other (M−

N) transmit antennas.

14. The method of claim 9, wherein the at least one predetermined signal includes dummy bits predefined between the transmitting end and the receiving end.

15. A receiving end for receiving data blocks in a multiple input multiple output (MIMO) wireless communication system, the receiving end comprising:

a signal reception unit for receiving cyclic redundancy check (CRC)-attached data blocks, wherein a CRC is independently attached to each of the data blocks;

a channel estimation unit for estimating channel status of M transmit antennas of a transmitting end, wherein M is greater than 1; and

a feedback signal transfer unit for transmitting feedback information based on the estimated channel status to facilitate selecting N transmit antennas from among the M transmit antennas for use in transmitting data blocks, such that the other (M−

N) transmit antennas are not for use in transmitting data blocks,

wherein the feedback information includes indexes to facilitate the selection of the N transmit antennas,

wherein at least one predetermined signal is received via at least one of the M transmit antennas, and

wherein, if information indicating that a specific predetermined signal, which is transmitted via a specific transmit antenna, is not correctly received by the receiving end is transmitted by the receiving end to the transmitting end, the specific predetermined signal is re-received via the specific transmit antenna.

16. The receiving end of claim 15, wherein:

a number of the transmitted data blocks is to be equal to N.