초록

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.

대표청구항 ▼

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 infor

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; andtransmitting 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; andtransmitting 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.