Pseudo eigen-beamforming with dynamic beam selection
First Claim
1. An apparatus comprising:
- at least one processor configured to obtain channel information for a subset of multiple antennas used for data reception at a receiver, to derive multiple eigenvectors based on the channel information, to select at least one eigenvector from among the multiple eigenvectors, and to use the at least one eigenvector for data transmission to the receiver; and
a memory coupled to the at least one processor.
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Accused Products
Abstract
Techniques for transmitting data with limited channel information are described. A transmitter (e.g., a base station) obtains channel information for a subset of multiple antennas used for data reception at a receiver (e.g., a terminal). The channel information may include at least one channel response vector for at least one antenna, which is a subset of the multiple antennas at the receiver. The transmitter derives multiple eigenvectors based on the channel information, e.g., using pseudo eigen-beamforming. The transmitter selects at least one eigenvector from among the multiple eigenvectors and transmits data with the selected eigenvector(s). The transmitter may select and use different subsets of eigenvector(s) in different time intervals. The transmitter may arrange the multiple eigenvectors into multiple sets based on their eigenvalues, select at least one set based on a MIMO transmission rank, and select one eigenvector from each set.
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Citations
44 Claims
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1. An apparatus comprising:
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at least one processor configured to obtain channel information for a subset of multiple antennas used for data reception at a receiver, to derive multiple eigenvectors based on the channel information, to select at least one eigenvector from among the multiple eigenvectors, and to use the at least one eigenvector for data transmission to the receiver; and
a memory coupled to the at least one processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method comprising:
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obtaining channel information for a subset of multiple antennas used for data reception at a receiver;
deriving multiple eigenvectors based on the channel information;
selecting at least one eigenvector from among the multiple eigenvectors; and
using the at least one eigenvector for data transmission to the receiver. - View Dependent Claims (19, 20, 21, 22)
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23. An apparatus comprising:
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means for obtaining channel information for a subset of multiple antennas used for data reception at a receiver;
means for deriving multiple eigenvectors based on the channel information;
means for selecting at least one eigenvector from among the multiple eigenvectors; and
means for using the at least one eigenvector for data transmission to the receiver. - View Dependent Claims (24, 25, 26, 27)
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28. A computer-readable medium including instructions stored thereon, comprising:
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a first instruction set for obtaining channel information for a subset of multiple antennas used for data reception at a receiver;
a second instruction set for deriving multiple eigenvectors based on the channel information;
a third instruction set for selecting at least one eigenvector from among the multiple eigenvectors; and
a fourth instruction set for using the at least one eigenvector for data transmission to the receiver.
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29. An apparatus comprising:
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at least one processor configured to receive symbols for a data transmission sent via a multiple-input multiple-output (MIMO) channel to multiple antennas at a receiver, to determine an effective channel response matrix formed by a channel response matrix for the MIMO channel and at least one eigenvector used for the data transmission and selected from among multiple eigenvectors derived based on channel information for a subset of the multiple antennas, and to perform MIMO detection on the received symbols with the effective channel response matrix; and
a memory coupled to the at least one processor. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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38. A method comprising:
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receiving symbols for a data transmission sent via a multiple-input multiple-output (MIMO) channel to multiple antennas at a receiver;
determining an effective channel response matrix formed by a channel response matrix for the MIMO channel and at least one eigenvector used for the data transmission and selected from among multiple eigenvectors derived based on channel information for a subset of the multiple antennas; and
performing MIMO detection on the received symbols with the effective channel response matrix. - View Dependent Claims (39, 40)
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41. An apparatus comprising:
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means for receiving symbols for a data transmission sent via a multiple-input multiple-output (MIMO) channel to multiple antennas at a receiver;
means for determining an effective channel response matrix formed by a channel response matrix for the MIMO channel and at least one eigenvector used for the data transmission and selected from among multiple eigenvectors derived based on channel information for a subset of the multiple antennas; and
means for performing MIMO detection on the received symbols with the effective channel response matrix. - View Dependent Claims (42, 43)
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44. A computer-readable medium including instructions stored thereon, comprising:
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a first instruction set for directing reception of symbols for a data transmission sent via a multiple-input multiple-output (MIMO) channel to multiple antennas at a receiver;
a second instruction set for determining an effective channel response matrix formed by a channel response matrix for the MIMO channel and at least one eigenvector used for the data transmission and selected from among multiple eigenvectors derived based on channel information for a subset of the multiple antennas; and
a third instruction set for performing MIMO detection on the received symbols with the effective channel response matrix.
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Specification