Derivation of eigenvectors for spatial processing in MIMO communication systems
First Claim
1. In a wireless multiple-input multiple-output (MIMO) communication system, a method of deriving a matched filter based on a steered reference, comprising:
- obtaining a plurality of sets of received symbols for the steered reference received via a first link and generated based on a plurality of steering vectors; and
deriving the matched filter based on the plurality of sets of received symbols, wherein the matched filter includes a plurality of eigenvectors corresponding to the plurality of steering vectors.
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Abstract
Techniques for deriving eigenvectors based on steered reference and used for spatial processing. A steered reference is a pilot transmission on one eigenmode of a MIMO channel per symbol period using a steering vector for that eigenmode. The steered reference is used to estimate both a matrix Σ of singular values and a matrix U of left eigenvectors of a channel response matrix H. A matrix Ũ with orthogonalized columns may be derived based on the estimates of Σ and U, e.g., using QR factorization, minimum square error computation, or polar decomposition. The estimates of Σ and U (or the estimate of Σ and the matrix Ũ) may be used for matched filtering of data transmission received via a first link. The estimate of U or the matrix Ũ may also be used for spatial processing of data transmission on a second link (for reciprocal first and second links).
70 Citations
30 Claims
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1. In a wireless multiple-input multiple-output (MIMO) communication system, a method of deriving a matched filter based on a steered reference, comprising:
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obtaining a plurality of sets of received symbols for the steered reference received via a first link and generated based on a plurality of steering vectors; and deriving the matched filter based on the plurality of sets of received symbols, wherein the matched filter includes a plurality of eigenvectors corresponding to the plurality of steering vectors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. In a wireless multiple-input multiple-output (MIMO) communication system, a method of deriving eigenvectors used for spatial processing, comprising:
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obtaining a plurality of sets of received symbols for a steered reference received via a first link and generated based on a plurality of steering vectors, wherein each of the plurality of sets of received symbols is for a steered reference symbol generated based on one of the plurality of steering vectors; determining a plurality of scaled vectors based on the plurality of sets of received symbols, wherein each of the plurality of scaled vectors corresponds to a respective one of the plurality of steering vectors; and deriving a plurality of eigenvectors based on the plurality of scaled vectors, wherein the plurality of eigenvectors are used for matched filtering of data transmission received via the first link. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A memory communicatively coupled to a digital signal processing device (DSPD) capable of interpreting digital information to:
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determine a plurality of scaled vectors based on a plurality of sets of received symbols for a steered reference generated based on a plurality of steering vectors and received via a first link in a wireless multiple-input multiple-output (MIMO) communication system, wherein each of the plurality of scaled vectors corresponds to a respective one of the plurality of steering vectors; and derive a plurality of eigenvectors based on the plurality of scaled vectors, wherein the plurality of eigenvectors are suitable for use for spatial processing.
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21. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
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a receive spatial processor operative to process a plurality of sets of received symbols for a steered reference to provide a plurality of scaled vectors, wherein the steered reference is received via a first link and generated based on a plurality of steering vectors, and wherein each of the plurality of scaled vectors corresponds to a respective one of the plurality of steering vectors; and a controller operative to derive a plurality of eigenvectors based on the plurality of scaled vectors, and wherein the receive spatial processor is further operative to perform matched filtering of a first data transmission received via the first link using the plurality of eigenvectors. - View Dependent Claims (22, 23, 24, 25, 26)
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27. An apparatus in a wireless multiple-input multiple-output (MIMO) communication system, comprising:
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means for determining a plurality of scaled vectors based on a plurality of sets of received symbols for a steered reference received via a first link and generated based on a plurality of steering vectors, wherein each of the plurality of scaled vectors corresponds to a respective one of the plurality of steering vectors; and means for deriving a plurality of eigenvectors based on the plurality of scaled vectors, wherein the plurality of eigenvectors are suitable for use for spatial processing. - View Dependent Claims (28, 29, 30)
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Specification