Reduced complexity beam-steered MIMO OFDM system
First Claim
1. An apparatus comprising:
- at least one processor configuredto receive channel information for at least one subcarrier that is a subset of multiple subcarriers used for data transmission,to obtain transmit steering matrices for the multiple subcarriers based on the channel information for the at least one subcarrier by obtaining at least one transmit steering matrix for the at least one subcarrier based on the channel information and determining a transmit steering matrix for each of the other multiple subcarriers based on the at least one transmit steering matrix by setting the transmit steering matrix for each of the other multiple subcarriers equal to a transmit steering matrix obtained for a closest one of the at least one subcarrier, andto process data for the multiple subcarriers with the transmit steering matrices to send the data from multiple transmit antennas to multiple receive antennas; and
a memory coupled to the at least one processor.
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Accused Products
Abstract
Techniques for transmitting data using channel information for a subset of all subcarriers used for data transmission are described. A transmitter station receives channel information for at least one subcarrier that is a subset of multiple subcarriers used for data transmission. The channel information may include at least one transmit steering matrix, at least one set of eigenvectors, at least one channel response matrix, at least one channel covariance matrix, an unsteered pilot, or a steered pilot for the at least one subcarrier. The transmitter station obtains at least one transmit steering matrix for the at least one subcarrier from the channel information and determines a transmit steering matrix for each of the multiple subcarriers. The transmitter station performs transmit steering or beam-steering for each of the multiple subcarriers with the transmit steering matrix for that subcarrier.
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Citations
14 Claims
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1. An apparatus comprising:
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at least one processor configured to receive channel information for at least one subcarrier that is a subset of multiple subcarriers used for data transmission, to obtain transmit steering matrices for the multiple subcarriers based on the channel information for the at least one subcarrier by obtaining at least one transmit steering matrix for the at least one subcarrier based on the channel information and determining a transmit steering matrix for each of the other multiple subcarriers based on the at least one transmit steering matrix by setting the transmit steering matrix for each of the other multiple subcarriers equal to a transmit steering matrix obtained for a closest one of the at least one subcarrier, and to process data for the multiple subcarriers with the transmit steering matrices to send the data from multiple transmit antennas to multiple receive antennas; and a memory coupled to the at least one processor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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receiving channel information for at least one subcarrier that is a subset of multiple subcarriers used for data transmission; obtaining transmit steering matrices for the multiple subcarriers based on the channel information for the at least one subcarrier by obtaining at least one transmit steering matrix for the at least one subcarrier from the channel information and determining a transmit steering matrix for each of the other multiple subcarriers based on the at least one transmit steering matrix by setting the transmit steering matrix for each of the other multiple subcarriers equal to a transmit steering matrix obtained for a closest one of the at least one subcarrier; and processing data for the multiple subcarriers with the transmit steering matrices to send the data from multiple transmit antennas to multiple receive antennas. - View Dependent Claims (11)
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12. An apparatus comprising:
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means for receiving channel information for at least one subcarrier that is a subset of multiple subcarriers used for data transmission; means for obtaining transmit steering matrices for the multiple subcarriers based on the channel information for the at least one subcarrier by obtaining at least one transmit steering matrix for the at least one subcarrier from the channel information and determining a transmit steering matrix for each of the other multiple subcarriers based on the at least one transmit steering matrix by setting the transmit steering matrix for each of the other multiple subcarriers equal to a transmit steering matrix obtained for a closest one of the at least one subcarrier; and means for processing data for the multiple subcarriers with the transmit steering matrices to send the data from multiple transmit antennas to multiple receive antennas. - View Dependent Claims (13)
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14. A memory apparatus including instructions stored thereon, comprising:
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a first instruction set for receiving channel information for at least one subcarrier that is a subset of multiple subcarriers used for data transmission; a second instruction set for obtaining transmit steering matrices for the multiple subcarriers based on the channel information for the at least one subcarrier, by obtaining at least one transmit steering matrix for the at least one subcarrier based on the channel information and determining a transmit steering matrix for each of the other multiple subcarriers based on the at least one transmit steering matrix by setting the transmit steering matrix for each of the other multiple subcarriers equal to a transmit steering matrix obtained for a closest one of the at least one subcarrier; and a third instruction set for processing data for the multiple subcarriers with the transmit steering matrices to send the data from multiple transmit antennas to multiple receive antennas.
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Specification