Spatial puncturing apparatus, method, and system

• US 8,160,028 B2
• Filed: 04/01/2010
• Issued: 04/17/2012
• Est. Priority Date: 06/23/2004
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Poon, Ada S. Y.
• Primary Examiner(s): Sinkantarakorn, Pao
• Application Number:
  US12/752,751
• Publication Number:
  US 20100189091A1
• Time in Patent Office: 747 Days
• Field of Search: 370/203, 370/208, 370252-254, 370/310, 370/328, 370/334, 370/343, 370/345, 370/447, 370/477, 370/478, 370/480, 370/498, 375/260, 375/267, 375/299, 375/347, 455/561, 455/562.1
• US Class Current: 370/334
• CPC Class Codes: H04B 7/0408 using two or more beams, i.e. beam diversity
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/06 using space diversity

Abstract

Stations in a N×N multiple-input-multiple-output (MIMO) wireless network always puncture the weakest spatial channel. N−1 spatial channels are always used regardless of the channel state.

Claims

1. A method comprising:

receiving a training sequence from a transmitter;

estimating N spatial channels, wherein N is greater than one and equal to a number of receiving antennas;

transmitting channel state information to the transmitter using only N−

1 spatial channels, wherein the channel state information always only describes N−

1 spatial channels.

2. The method of claim 1 wherein the channel state information includes a beamforming matrix to cause the transmitter to utilize N−

1 spatial channels.

3. The method of claim 2 wherein N is equal to four.

4. The method of claim 2 wherein N is equal to three.

5. The method of claim 1 wherein the channel state information describes spatial channels in an orthogonal frequency division multiplexing (OFDM) multiple-input-multiple-output (MIMO) system.

6. A non-transitory computer-readable medium encoded with instructions that when executed by a computer cause the computer to perform:

receiving a training sequence from a transmitter;

estimating N spatial channels, wherein N is greater than one and equal to a number of receiving antennas;

transmitting channel state information to the transmitter, wherein the channel state information always only describes N−

1 spatial channels.

7. The computer-readable medium of claim 6 wherein the channel state information includes a beamforming matrix to cause the transmitter to utilize N−

1 spatial channels.

8. The computer-readable medium of claim 6 wherein the channel state information describes spatial channels in an orthogonal frequency division multiplexing (OFDM) multiple-input-multiple-output (MIMO) system.

9. A wireless communications device having N antennas, the wireless communications device having a combination of hardware and software components to determine and puncture a weakest of N spatial channels, wherein the wireless communications device includes a combination of hardware and software to estimate N spatial channels and to transmit channel state information as a beamforming matrix corresponding to only N−

1 spatial channels, where N is greater than one and the beamforming matrix corresponding to the N−

1 spatial channels is fed back to another wireless communication device.

10. The wireless communications device of claim 9 wherein the wireless communications device includes N−

1 baseband data circuits to source data to a beamforming network.

11. The wireless communications device of claim 9 wherein N is equal to four, and three spatial channels are always used.

12. The wireless communications device of claim 9 wherein N is equal to three, and two spatial channels are always used.

13. A method comprising:

receiving a training sequence from a transmitter;

estimating N spatial channels in a multiple-input-multiple-output (MIMO) system, wherein N is greater than one and equal to a number of receiving antennas;

performing singular value decomposition to determine a transmit beamforming matrix;

removing one transmit beamforming vector from the transmit beamforming matrix to yield N−

1 transmit beamforming vectors; and

transmitting the N−

1 transmit beamforming vectors to the transmitter.

14. The method of claim 13 wherein N is equal to four.

15. The method of claim 13 wherein N is equal to three.

16. A non-transitory computer-readable medium encoded with instructions that when executed by a computer cause the computer to perform:

receiving a training sequence from a transmitter;

estimating N spatial channels in a multiple-input-multiple-output (MIMO) system, wherein N is greater than one and equal to a number of receiving antennas;

performing singular value decomposition to determine a transmit beamforming matrix;

removing one transmit beamforming vector from the transmit beamforming matrix to yield N−

1 transmit beamforming vectors; and

transmitting the N−

1 transmit beamforming vectors to the transmitter.

17. The computer-readable medium of claim 16 wherein the channel state information includes a beamforming matrix to cause the transmitter to utilize N−

1 spatial channels.

18. The computer-readable medium of claim 16 wherein the channel state information describes spatial channels in an orthogonal frequency division multiplexing (OFDM) multiple-input-multiple-output (MIMO) system.

19. A wireless communications device having N antennas, the wireless communications device having a combination of hardware and software components to always puncture one of N spatial channels, wherein the wireless communications device includes a combination of hardware and software to estimate N spatial channels and to transmit channel state information as N−

1 beamforming vectors to a transmitter as feedback for use in antenna beamforming into only N−

1 spatial channels, where N is greater than one and the N−

1 beamforming vectors are calculated by not including the punctured channel.

20. The wireless communications device of claim 19 wherein the wireless communications device includes N−

1 baseband data circuits to source data to a beamforming network.

21. The wireless communications device of claim 19 wherein N is equal to four, and three spatial channels are always used.

22. The wireless communications device of claim 19 wherein N is equal to three, and two spatial channels are always used.