Method for computing a downlink beamforming weighting vector based on up link channel information
First Claim
1. A method for obtaining a downlink beamforming weighting vector based on channel information about an uplink channel in a wireless communications system, the method comprising:
- obtaining the channel information about of the uplink channel by a means selected from the group comprising training signals, pilot signals, and data signals, wherein the uplink channel comprises a set of uplink sub-channels;
calculating a spatial signature of the uplink channel with the channel information; and
computing a downlink beamforming weighting vector of a downlink channel with the spatial signature of the uplink channel, wherein the downlink channel comprises a set of downlink sub-channels that share few or no sub-carriers with the set of uplink sub-channels.
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Abstract
The present invention discloses a method for obtaining a downlink beamforming weighting vector in a wireless communications system based on channel information about an uplink channel. The method comprises obtaining the channel information about the uplink channel by a means selected from the group comprising of training signals, pilot signals, and data signals, wherein the uplink channel comprises a set of uplink sub-channels, calculating a spatial signature of the uplink channel with the channel information, and computing a downlink beamforming weighting vector of a downlink channel with the spatial signature of the uplink channel, wherein the downlink channel comprises a set of downlink sub-channels that share few or no sub-carriers with the set of uplink sub-channels.
35 Citations
17 Claims
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1. A method for obtaining a downlink beamforming weighting vector based on channel information about an uplink channel in a wireless communications system, the method comprising:
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obtaining the channel information about of the uplink channel by a means selected from the group comprising training signals, pilot signals, and data signals, wherein the uplink channel comprises a set of uplink sub-channels; calculating a spatial signature of the uplink channel with the channel information; and computing a downlink beamforming weighting vector of a downlink channel with the spatial signature of the uplink channel, wherein the downlink channel comprises a set of downlink sub-channels that share few or no sub-carriers with the set of uplink sub-channels. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for obtaining a downlink beamforming weighting vector based on channel information of an uplink channel in a wireless communications system, the method comprising:
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obtaining the channel information about the uplink channel by a means selected from the group comprising training signals, pilot signals, and data signals, wherein the uplink channel comprises a set of uplink sub-channels; calculating a spatial signature of the uplink channel with the channel information; and computing a downlink beamforming weighting vector of a downlink channel with the spatial signature of the uplink channel, wherein the downlink channel comprises a set of downlink sub-channels that fall in neighborhoods of one or more uplink sub-channels comprising a number of sub-carries. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for obtaining a downlink beamforming weighting vector based on channel information of an uplink channel in a wireless communications system, the method comprising:
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obtaining the channel information about the uplink channel by a means selected from the group comprising training signals, pilot signals, and data signals, wherein the uplink channel comprises a set of uplink sub-channels; calculating a spatial signature of the uplink channel with the channel information; and computing a downlink beamforming weighting vector of a downlink channel with the spatial signature of the uplink channel, wherein the computing further comprising; computing the downlink beamforming weighting vector of the downlink sub-channels with the uplink sub-channel information under the condition that the sub-carriers in the downlink sub-channels fall within one or more neighborhoods of the uplink sub-channels; and constructing the downlink beamforming weighting vector of the downlink sub-channels with the channel information about the immediate neighborhoods of the uplink sub-channels under the condition that the sub-carriers in the downlink sub-channels fall outside one or more neighborhoods of the uplink sub-channels. - View Dependent Claims (14, 15, 16, 17)
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Specification