Method and apparatus for multi-antenna transmission
First Claim
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1. A method for multi-antenna transmission, the method comprising the steps of:
- receiving a plurality of frequency subcarriers at a receiver, the plurality of frequency subcarriers being transmitted from a transmitter;
grouping the frequency subcarriers into a plurality of frequency subcarrier blocks, each frequency subcarrier block comprising a plurality K of frequency subcarriers; and
calculating for each frequency subcarrier block a single weighting matrix Vc, for use in a transmission of multi-antenna signal, wherein the single weighting matrix Vc is calculated based on a matrix channel frequency response between the transmitter and the receiver on the frequency subscriber block for which Vc is being calculated.
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Abstract
In a multiple-input, multiple-output (MIMO) communication system, a method and apparatus for multi-antenna transmission. In accordance with the preferred embodiment of the present invention a reduced number of transmit weight matrices are fed back to the transmitter. Each transmit weight matrix is then applied to a plurality of subcarriers. Because each transmit weight matrix is applied to more than one subcarrier, the amount of weight matrixs being fed back to the transmitter is greatly reduced.
251 Citations
19 Claims
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1. A method for multi-antenna transmission, the method comprising the steps of:
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receiving a plurality of frequency subcarriers at a receiver, the plurality of frequency subcarriers being transmitted from a transmitter;
grouping the frequency subcarriers into a plurality of frequency subcarrier blocks, each frequency subcarrier block comprising a plurality K of frequency subcarriers; and
calculating for each frequency subcarrier block a single weighting matrix Vc, for use in a transmission of multi-antenna signal, wherein the single weighting matrix Vc is calculated based on a matrix channel frequency response between the transmitter and the receiver on the frequency subscriber block for which Vc is being calculated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for multi-antenna transmission, the method comprising the steps of:
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receiving a plurality of frequency subcarriers;
grouping the plurality of frequency subcarriers into a plurality of frequency subcarrier blocks, each frequency subcarrier block comprising a plurality K of frequency subcarriers;
calculating a single weighting matrix Vc for each of the plurality of frequency subcarrier blocks and for use in a transmission of a multi-antenna signal, wherein the single weighting matrix Vc is calculated based on a matrix channel frequency response between a transmitter and a receiver on the frequency subcarrier block for which Vc is being calculated; and
weighting all frequency subcarriers within the frequency subcarrier block with Vc. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An apparatus comprising:
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an adaptive weight controller, the adaptive weight controller having as an input, a plurality of frequency subcarriers and outputting a plurality of weighting matrices Vc, wherein;
a single weighting matrix is calculated for a frequency subcarrier block comprising a plurality K of frequency subcarriers, wherein the single weighting matrix is calculated based on a matrix channel frequency response between a transmitter and a receiver on the frequency subcarrier block; and
a transmitter adapted to transmit a multi-antenna signal that is formed based on the single weighting matrix Vc for each frequency subcarrier block. - View Dependent Claims (17, 18, 19)
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Specification