Efficient computation of spatial filter matrices for steering transmit diversity in a MIMO communication system
First Claim
1. A method of transmitting data including a stream of symbols via a multiple-input multiple-output (MIMO) channel, comprising:
- deriving an initial spatial filter matrix based on both a channel response matrix and a selected receiver processing technique; and
performing spatial processing on the stream of symbols with a spatial filter based on the initial spatial filter matrix and with different steering matrices so that a data transmission observes a plurality of effective channels.
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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.
140 Citations
25 Claims
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1. A method of transmitting data including a stream of symbols via a multiple-input multiple-output (MIMO) channel, comprising:
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deriving an initial spatial filter matrix based on both a channel response matrix and a selected receiver processing technique; and performing spatial processing on the stream of symbols with a spatial filter based on the initial spatial filter matrix and with different steering matrices so that a data transmission observes a plurality of effective channels. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A computer-readable medium having stored thereon computer executable instructions for transmitting data including a stream of symbols via a multiple-input multiple-output (MIMO) channel, the instructions comprising code for;
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deriving an initial spatial filter matrix based on a channel response matrix and a selected receiver processing technique; and performing spatial processing using a spatial filter matrix based on the initial spatial filter matrix and with different steering matrices so that a data transmission observes a plurality of effective channels. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
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means for deriving an initial spatial filter matrix based on a channel response matrix and a selected receiver processing technique; and means for performing spatial processing with a spatial filter matrix derived from the initial spatial filter matrix and with different steering matrices to allow a data transmission to observe a plurality of effective channels. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
a spatial processor configured to derive an initial spatial filter matrix based on a channel response matrix and a selected receiver processing technique, and perform spatial processing with a spatial filter matrix derived from the initial spatial filter matrix and with different steering matrices to allow a data transmission to observe a plurality of effective channels. - View Dependent Claims (20, 21, 22, 23, 24)
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25. An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:
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a module configured to derive an initial spatial filter matrix based on a channel response matrix and a selected receiver processing technique; and a module configured to perform spatial processing with a spatial filter matrix derived from the initial spatial filter matrix and with different steering matrices to allow a data transmission to observe a plurality of effective channels.
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Specification