Derivation of eigenvectors for spatial processing in MIMO communication systems
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United States of America Patent
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Oct 9, 2007
Grant Date -
Aug 26, 2004
app pub date -
Dec 4, 2003
filing date -
Dec 11, 2002
priority date (Note) -
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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 .SIGMA. of singular values and a matrix U of left eigenvectors of a channel response matrix H. A matrix with orthogonalized columns may be derived based on the estimates of .SIGMA. and U, e.g., using QR factorization, minimum square error computation, or polar decomposition. The estimates of .SIGMA. and U (or the estimate of .SIGMA. and the matrix ) may be used for matched filtering of data transmission received via a first link. The estimate of U or the matrix may also be used for spatial processing of data transmission on a second link (for reciprocal first and second links).
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