Method and apparatus for multi-antenna transmission
AssigneeMotorola, Inc.
InventorsFrederick W. Vook, Timothy A. Thomas, Xiangyang Zhuang
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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.
Claims19
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.
A method for multi-antenna transmission, the method comprising the steps of:
- 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.
An apparatus comprising:
- 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.
Dependencies are inferred from the claim text.