Apparatus and method for selecting effective channel in a multi-user MIMO system
First Claim
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1. A multi-user Multiple-Input Multiple-Output (MIMO) system, comprising:
- a receiver configured to;
receive pilot signals through each of antennas from a transmitter;
select an antenna having a best channel quality among the antennas using the pilot signals; and
generate feedback information comprising channel information on the selected antenna; and
the transmitter configured to;
receive the feedback information from each of a plurality of receivers;
generate a channel matrix using the feedback information; and
transmit data simultaneously to the plurality of receivers using the channel matrix,wherein the feedback information comprises a Hermitian matrix comprising channel information
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Abstract
An apparatus and method for selecting an effective channel in a multi-user MIMO system are provided, in which a receiver receives pilot signals from a transmitter, determines channel information indicating an antenna offering the best quality among a plurality of antennas using the pilot signals, and generates feedback information with the channel information, and the transmitter receives feedback information from a plurality of receivers, generates a channel matrix using the feedback information, and transmits data simultaneously to the plurality of receivers using the channel matrix.
18 Citations
27 Claims
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1. A multi-user Multiple-Input Multiple-Output (MIMO) system, comprising:
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a receiver configured to; receive pilot signals through each of antennas from a transmitter; select an antenna having a best channel quality among the antennas using the pilot signals; and generate feedback information comprising channel information on the selected antenna; and the transmitter configured to; receive the feedback information from each of a plurality of receivers; generate a channel matrix using the feedback information; and transmit data simultaneously to the plurality of receivers using the channel matrix, wherein the feedback information comprises a Hermitian matrix comprising channel information
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2. A multi-user Multiple-Input Multiple-Output (MIMO) system, comprising:
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a receiver configured to; receive pilot signals through each of antennas from a transmitter; select an antenna having a best channel quality among the antennas using the pilot signals; and generate feedback information comprising channel information on the selected antenna; and the transmitter configured to; receive the feedback information from each of a plurality of receivers; generate a channel matrix using the feedback information; and transmit data simultaneously to the plurality of receivers using the channel matrix, wherein the transmitter is further configured to calculate backward filter information BblockH, forward filter information FblockH, and a scaling factor β
blockH for each of the receivers using the channel information received from each receiver, andwherein H is a Hermitian operator. - View Dependent Claims (3, 4, 5, 6)
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7. A channel selection method in a multi-user Multiple-Input Multiple-Output (MIMO) system, the method comprising:
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receiving pilot signals through a plurality of antennas from a transmitter; selecting an antenna having a best channel quality among the antennas using the pilot signals by each of a plurality of receivers; sending feedback information comprising channel information on the selected antenna to the transmitter by each receiver; receiving the feedback information from each of the plurality of receivers; generating a channel matrix using the feedback information by the transmitter; and transmitting data simultaneously to the plurality of receivers using the channel matrix, wherein the channel matrix generation comprises generating the channel matrix comprising backward filter information BblockH, forward filter information FblockH, and a scaling factor β
blockH, the backward filter information BblockH, the forward filter information FblockH, and the scaling factor β
blockH being calculated for the each receiver using the feedback information received from the each receiver, andwherein H is a Hermitian operator. - View Dependent Claims (8)
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9. An apparatus of a receiver for extracting channel information in a multi-user Multiple-Input Multiple-Output (MIMO) system, the apparatus comprising:
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a receive beamformer configured to, upon receipt of different signals through a plurality of antennas; determine channel information indicating channel information using the received signals; and send the channel information to a transmitter; and a multiplier configured to, upon receipt of a scaling factor from the transmitter, multiply an input signal by the inverse of the scaling factor. - View Dependent Claims (10, 11, 12)
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13. An apparatus of a transmitter for selecting a channel in a multi-user Multiple-Input Multiple-Output (MIMO) system, the apparatus comprising:
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an extractor configured to, upon receipt of channel information from a plurality of receivers, extract filter information from the channel information; a Tomlinson-Harashima Precoding (THP) part configured to control the power of data using the filter information; and a beamforming part configured to control beamforming for a plurality of antennas using the filter information in order to simultaneously transmit the power-controlled data to the plurality of receivers. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A method of a transmitter for selecting a channel in a multi-user Multiple-Input Multiple-Output (MIMO) system, the method comprising:
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extracting, upon receipt of channel information from a plurality of receivers, filter information from the channel information; controlling the power of data using the filter information; and controlling beamforming for a plurality of antennas using the filter information in order to simultaneously transmit the power-controlled data to the plurality of receivers. - View Dependent Claims (21, 22, 23, 24, 25)
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26. A computer-readable recording medium storing a program for selecting a channel in a multi-user Multiple-Input Multiple-Output (MIMO) system, comprising:
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a first set of instructions for receiving pilot signals through a plurality of antennas from a transmitter and selecting an antenna having a best channel quality among the antennas using the pilot signals by each of a plurality of receivers; a second set of instructions for sending feedback information comprising channel information on the selected antenna to the transmitter by each receiver; a third set of instructions for receiving the feedback information from each of the plurality of receivers and generating a channel matrix using the feedback information by the transmitter; and a fourth set of instructions for transmitting data simultaneously to the plurality of receivers using the channel matrix, wherein the channel matrix generation comprises generating the channel matrix comprising backward filter information BblockH, forward filter information FblockH, and a scaling factor β
blockH, the backward filter information BblockH, the forward filter information FblockH, and the scaling factor β
blockH being calculated for the each receiver using the feedback information received from the each receiver, andwhere H is a matrix value.
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27. A computer-readable recording medium storing a program for selecting a channel in a multi-user Multiple-Input Multiple-Output (MIMO) system, comprising:
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a first set of instructions for extracting, upon receipt of channel information from a plurality of receivers, filter information from the channel information; a second set of instructions for controlling the power of data using the filter information; and a third set of instructions for controlling beamforming for a plurality of antennas using the filter information in order to simultaneously transmit the power-controlled data to the plurality of receivers.
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Specification