METHOD AND APPARATUS FOR PRECODING VALIDATION IN WIRELESS COMMUNICATIONS
First Claim
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1. A method for validation of precoding in multiple-input/multiple output (MIMO) wireless communications, comprising:
- defining a codebook comprising a plurality of original precoding matrices;
defining an original dedicated pilot symbol;
applying at least one phase rotation to at least one ofan original precoding matrix andthe original dedicated pilot symbol;
to produce, respectively, a modified precoding matrix and a modified dedicated pilot symbol.
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Abstract
A method and apparatus for precoding validation in wireless communications with reduced error probability is disclosed. Error probability is reduced by applying phase rotations to precoding matrices, dedicated pilot symbols, or both to maximize a minimum pairwise distance.
89 Citations
11 Claims
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1. A method for validation of precoding in multiple-input/multiple output (MIMO) wireless communications, comprising:
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defining a codebook comprising a plurality of original precoding matrices; defining an original dedicated pilot symbol; applying at least one phase rotation to at least one of an original precoding matrix and the original dedicated pilot symbol; to produce, respectively, a modified precoding matrix and a modified dedicated pilot symbol. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A wireless transmit/receive unit (WTRU) configured for validation of precoding in multiple-input/multiple output (MIMO) wireless communications, comprising:
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a precoding matrix index (PMI) detection circuit configured for receiving a PMI; a codebook table configured for storing a plurality of precoding matrices; a precoding selection circuit coupled to the PMI detection circuit and codebook table, configured to select a precoding matrix in the codebook table based on a PMI received by the PMI detection circuit; a dedicated pilot insertion circuit configured to add dedicated pilot symbols to data; a common pilot insertion circuit configured for inserting common pilot symbols into the precoded signal; a phase shift table configured for; storing first sets of phase rotations; receiving a PMI from the PMI detection circuit; and selecting a stored first set of phase rotations based on the PMI; a phase shifting circuit configured for; receiving the selected first set of phase rotations from the phase shifting table; receiving the selected precoding matrix from the precoding selection circuit; applying the selected first set of phase rotations to the selected precoding matrix to make a new precoding matrix; a precoding circuit configured to receive the new precoding matrix from the phase shifting circuit;
receive the dedicated pilot symbols and data from the dedicated pilot insertion circuit and apply the selected matrix to the dedicated pilot symbols and data to form a precoded signal; anda plurality of antennas configured for transmitting the precoded signal and receiving the PMI. - View Dependent Claims (8, 9, 10, 11)
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Specification