Unitary precoding based on randomized FFT matrices
First Claim
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1. A method that facilitates controlling transmission in response to feedback in a wireless communication system, comprising:
- constructing a set of unitary matrices, each of the unitary matrices being generated based upon a diagonal matrix and a Discrete Fourier Transform (DFT) matrix, wherein the set of unitary matrices includes a first cluster of unitary matrices, the first cluster of unitary matrices including a subset of the set of unitary matrices;
identifying a selected unitary matrix from the constructed set of unitary matrices based upon a received index, wherein the selected unitary matrix corresponds to a channel unitary matrix derived by a mobile device from forward link channel estimations;
determining whether the selected unitary matrix is included in the first cluster of unitary matrices; and
modifying transmission over the forward link channel based upon the selected unitary matrix being included in the first cluster of unitary matrices;
wherein the modifying transmission over the forward link channel further comprises utilizing substantially equal transmission power for each transmit antenna based upon the selected unitary matrix.
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Abstract
Systems and methodologies are described that facilitate constructing unitary matrices that may be utilized in linear precoding for multiple-input multiple-output (MIMO) wireless communication systems. Each unitary matrix may be generated by combining (e.g., multiplying) a diagonal matrix with a Discrete Fourier Transform (DFT) matrix. The unitary matrices may be utilized to provide feedback related to a channel and/or control transmission over a channel based upon obtained feedback.
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Citations
20 Claims
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1. A method that facilitates controlling transmission in response to feedback in a wireless communication system, comprising:
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constructing a set of unitary matrices, each of the unitary matrices being generated based upon a diagonal matrix and a Discrete Fourier Transform (DFT) matrix, wherein the set of unitary matrices includes a first cluster of unitary matrices, the first cluster of unitary matrices including a subset of the set of unitary matrices; identifying a selected unitary matrix from the constructed set of unitary matrices based upon a received index, wherein the selected unitary matrix corresponds to a channel unitary matrix derived by a mobile device from forward link channel estimations; determining whether the selected unitary matrix is included in the first cluster of unitary matrices; and modifying transmission over the forward link channel based upon the selected unitary matrix being included in the first cluster of unitary matrices; wherein the modifying transmission over the forward link channel further comprises utilizing substantially equal transmission power for each transmit antenna based upon the selected unitary matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A wireless communications apparatus, comprising:
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a memory that retains instructions for; constructing a set of unitary matrices, each of the unitary matrices being generated based upon a diagonal matrix and a Discrete Fourier Transform (DFT) matrix, wherein the set of unitary matrices includes a first cluster of unitary matrices, the first cluster of unitary matrices including a subset of the set of unitary matrices; identifying a selected unitary matrix from the constructed set of unitary matrices based upon a received index, wherein the selected unitary matrix corresponds to a channel unitary matrix derived by a mobile device from forward link channel estimations; determining whether the selected unitary matrix is included in the first cluster of unitary matrices; and modifying transmission over the forward link channel based upon the selected unitary matrix being included in the first cluster of unitary matrices, wherein the controlling transmission includes utilizing substantially equal transmission power for each transmit antenna based upon the selected unitary matrix; and a processor, coupled to the memory, configured to execute the instructions retained in memory. - View Dependent Claims (15)
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16. A wireless communications apparatus that constructs unitary matrices and controls transmission over a channel, comprising:
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means for constructing a set of unitary matrices, each of the unitary matrices being generated based upon a diagonal matrix and a Discrete Fourier Transform (DFT) matrix, wherein the set of unitary matrices includes a first cluster of unitary matrices, the first cluster of unitary matrices including a subset of the set of unitary matrices; means for identifying a selected unitary matrix from the constructed set of unitary matrices based upon a received index, wherein the selected unitary matrix corresponds to a channel unitary matrix derived by a mobile device from forward link channel estimations; determining whether the selected unitary matrix is included in the first cluster of unitary matrices; and means for modifying transmission over the forward link channel based upon the selected unitary matrix being included in the first cluster of unitary matrices; wherein the means for modifying transmission over the forward link channel utilizes substantially equal transmission power for each transmit antenna based upon the selected unitary matrix. - View Dependent Claims (17)
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18. A machine-readable non-transitory medium having stored thereon machine-executable instructions for:
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constructing a set of unitary matrices, each of the unitary matrices being generated based upon a diagonal matrix and a Discrete Fourier Transform (DFT) matrix, wherein the set of unitary matrices includes a first cluster of unitary matrices, the first cluster of unitary matrices including a subset of the set of unitary matrices; identifying a selected unitary matrix from the constructed set of unitary matrices based upon a received index, wherein the selected unitary matrix corresponds to a channel unitary matrix derived by a mobile device from forward link channel estimations; determining whether the selected unitary matrix is included in the first cluster of unitary matrices; and modifying transmission over the forward link channel based upon the selected unitary matrix being included in the first cluster of unitary matrices, wherein the modifying the transmission includes utilizing substantially equal transmission power for each transmit antenna based upon the selected unitary matrix. - View Dependent Claims (19)
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20. In a wireless communication system, an apparatus comprising:
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a processor configured to; construct a codebook that includes a set of unitary matrices, each of the unitary matrices being generated based upon a diagonal matrix and a Discrete Fourier Transform (DFT) matrix, wherein the codebook includes a first cluster of unitary matrices, the first cluster of unitary matrices including a subset of the set of unitary matrices; identify a selected unitary matrix from the constructed set of unitary matrices based upon a received index, wherein the selected unitary matrix corresponds to a channel unitary matrix derived by a mobile device from forward link channel estimations; determine whether the selected unitary matrix is included in the first cluster of unitary matrices; and modify transmission over the forward link channel based upon the selected unitary matrix being included in the first cluster of unitary matrices; wherein the processor configured to modify transmission is further configured to utilize substantially equal transmission power for each transmit antenna based upon the selected unitary matrix.
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Specification