Efficient computation of spatial filter matrices for steering transmit diversity in a MIMO communication system
First Claim
1. A method of deriving spatial filter matrices in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
- determining an initial spatial filter matrix; and
deriving a plurality of spatial filter matrices for a plurality of transmission spans based on the initial spatial filter matrix and a plurality of steering matrices used for the plurality of transmission spans.
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Abstract
Techniques for efficiently computing spatial filter matrices are described. The channel response matrices for a MIMO channel may be highly correlated if the channel is relatively static over a range of transmission spans. In this case, an initial spatial filter matrix may be derived based on one channel response matrix, and a spatial filter matrix for each transmission span may be computed based on the initial spatial filter matrix and a steering matrix used for that transmission span. The channel response matrices may be partially correlated if the MIMO channel is not static but does not change abruptly. In this case, a spatial filter matrix may be derived for one transmission span l and used to derive an initial spatial filter matrix for another transmission span m. A spatial filter matrix for transmission span m may be computed based on the initial spatial filter matrix, e.g., using an iterative procedure.
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Citations
38 Claims
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1. A method of deriving spatial filter matrices in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
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determining an initial spatial filter matrix; and deriving a plurality of spatial filter matrices for a plurality of transmission spans based on the initial spatial filter matrix and a plurality of steering matrices used for the plurality of transmission spans. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
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a processor operative to determine an initial spatial filter matrix and to derive a plurality of spatial filter matrices for a plurality of transmission spans based on the initial spatial filter matrix and a plurality of steering matrices used for the plurality of transmission spans; and a memory operative to store the plurality of steering matrices. - View Dependent Claims (16, 17, 18, 19)
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20. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
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means for determining an initial spatial filter matrix; and means for deriving a plurality of spatial filter matrices for a plurality of transmission spans based on the initial spatial filter matrix and a plurality of steering matrices used for the plurality of transmission spans. - View Dependent Claims (21, 22, 23, 24)
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25. A method of deriving spatial filter matrices in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
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deriving a first spatial filter matrix for a first transmission span; determining a first initial spatial filter matrix for a second transmission span based on the first spatial filter matrix; and deriving a second spatial filter matrix for the second transmission span based on the first initial spatial filter matrix. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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33. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
a processor operative to derive a first spatial filter matrix for a first transmission span, determine a first initial spatial filter matrix for a second transmission span based on the first spatial filter matrix, and derive a second spatial filter matrix for the second transmission span based on the first initial spatial filter matrix. - View Dependent Claims (34, 35)
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36. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
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means for deriving a first spatial filter matrix for a first transmission span; means for determining a first initial spatial filter matrix for a second transmission span based on the first spatial filter matrix; and means for deriving a second spatial filter matrix for the second transmission span based on the first initial spatial filter matrix. - View Dependent Claims (37, 38)
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Specification