Apparatus and method for eliminating multi-user interference
First Claim
1. A transmitter for providing a service to multi-users, comprising:
- a beamformer for generating beamformed user signals by multiplying transmit data of users, to whom the service is to be provided, by corresponding weighting factor vectors using feedback information;
a null space generator for generating a null space matrix orthogonal to weighting factor vectors of other users; and
a projector for projecting the beamformed user signals on the corresponding null space matrix.
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Abstract
Provided are an apparatus and method for eliminating multi-user interference in a codebook-based beamforming system. A transmitter for providing a service to multi-users in the codebook-based beamforming system includes a beamformer for generating beamformed user signals by multiplying transmit data of users, to whom the service is to be provided, by corresponding weighting factor vectors using feedback information; a null space generator for generating a null space matrix orthogonal to weighting factor vectors of other users; and a projector for projecting the beamformed user signals on the corresponding null space matrix and transmitting the resulting signals through a plurality of antennas. Because the multi-user signals can maintain orthogonality, the performance degradation caused by the multi-user interference can be prevented.
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Citations
22 Claims
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1. A transmitter for providing a service to multi-users, comprising:
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a beamformer for generating beamformed user signals by multiplying transmit data of users, to whom the service is to be provided, by corresponding weighting factor vectors using feedback information;
a null space generator for generating a null space matrix orthogonal to weighting factor vectors of other users; and
a projector for projecting the beamformed user signals on the corresponding null space matrix. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A transmitter for providing a service to multi-users, comprising:
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a user combination selector for selecting a predetermined number of weighting factor vectors orthogonal to one another among weighting factor vectors according to codebook indexes fed back from a receiver, and determining a user combination based on the selected weighting factor vectors; and
a beamformer for beamforming transmit data of users based on user combination into weighting factor vectors based on the corresponding fed-back codebook indexes. - View Dependent Claims (10, 11)
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12. A method for transmitting a service to multi-users in a codebook-based beamforming system, comprising the steps of:
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generating beamformed user signals by multiplying transmit data of users to which the service is to be provided using feedback information by corresponding weighting factor vectors;
generating a null space matrix orthogonal to weighting factor vectors of other users; and
projecting the beamformed user signals on the corresponding null space matrix. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method for transmitting a service to multi-users in a codebook-based beamforming system, comprising the steps of:
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selecting a predetermined number of weighting factor vectors orthogonal to one another among weighting factor vectors according to codebook indexes fed back from a receiver, and determining a user combination based on the selected weighting factor vectors; and
beamforming transmit data of users based on user combination into weighting factor vectors based on the corresponding fed-back codebook indexes. - View Dependent Claims (21, 22)
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Specification