Apparatus and method for transmitting/receiving data in a multi-antenna system, and system using the same
First Claim
1. A method for receiving data in a closed-loop multi-antenna system that defines multiple antenna groups by antenna grouping on multiple antennas, and performs data transmission individually via each of the multiple antenna groups, the method comprising the steps of:
- acquiring, from a received signal, channel quality information for each data stream transmitted individually via each antenna group corresponding to a transmission mode, which is one of a multi-user mode and a single-user mode selected depending on a comparison result between a sum rate (R_MU) in the multi-user mode and a sum rate (R_SU) in the single-user mode calculated by using a feedback information;
determining, from the channel quality information acquired individually for each antenna group, maximum channel quality information, an antenna group index associated with the maximum channel quality information, rank information, and remaining channel quality information associated the rank information; and
transmitting the determined maximum channel quality information, antenna group index, rank information, and remaining channel quality information to a transmission apparatus as the feedback information.
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Abstract
A data reception apparatus and method for generating and transmitting feedback information in a multi-antenna system using grouped antennas, and a data transmission apparatus and method for transmitting a data stream of a user according to a transmission mode selected depending on the feedback information is disclosed. The reception apparatus generates feedback information depending on maximum channel quality information, an antenna group index associated with the maximum channel quality information, rank information, and remaining channel quality information associated with the rank information, and transmits the feedback information to the transmission apparatus. The transmission apparatus selects one of a multi-user mode and a single-user mode as a transmission mode depending on the feedback information and transmits a data stream of a user via multiple antenna groups or one antenna group, according to the selected transmission mode.
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Citations
34 Claims
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1. A method for receiving data in a closed-loop multi-antenna system that defines multiple antenna groups by antenna grouping on multiple antennas, and performs data transmission individually via each of the multiple antenna groups, the method comprising the steps of:
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acquiring, from a received signal, channel quality information for each data stream transmitted individually via each antenna group corresponding to a transmission mode, which is one of a multi-user mode and a single-user mode selected depending on a comparison result between a sum rate (R_MU) in the multi-user mode and a sum rate (R_SU) in the single-user mode calculated by using a feedback information; determining, from the channel quality information acquired individually for each antenna group, maximum channel quality information, an antenna group index associated with the maximum channel quality information, rank information, and remaining channel quality information associated the rank information; and transmitting the determined maximum channel quality information, antenna group index, rank information, and remaining channel quality information to a transmission apparatus as the feedback information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for receiving data in a closed-loop multi-antenna system that defines multiple antenna groups by antenna grouping on multiple antennas, and performs data transmission individually via each of the multiple antenna groups, the apparatus comprising:
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a channel estimator for acquiring, from a received signal, channel quality information for each data stream transmitted individually via each antenna group; a feedback information generator for determining, from the channel quality information acquired individually for each antenna group corresponding to a transmission mode, which is one of a multi-user mode and a single-user mode selected depending on a comparison result between a sum rate (R_MU) in the multi-user mode and a sum rate (R_SU) in the single-user mode calculated by using a feedback information, maximum channel quality information, an antenna group index associated with the maximum channel quality information, rank information, and remaining channel quality information associated the rank information, and generating feedback information depending on the determined maximum channel quality information, antenna group index, rank information, and remaining channel quality information; and a transmitter for transmitting the feedback information to a transmission apparatus. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for transmitting data in a closed-loop multi-antenna system that defines multiple antenna groups by antenna grouping on multiple antennas, and performs data transmission individually via each of the multiple antenna groups, the method comprising the steps of:
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receiving, from multiple reception apparatuses, feedback information including maximum channel quality information, an antenna group index associated with the maximum channel quality information, rank information, and remaining channel quality information; calculating a sum rate (R_MU) in a multi-user mode based on the maximum channel quality information and the antenna group index, provided as feedback information from each reception apparatus; calculating a sum rate (R_SU) in a single-user mode based on the rank information, the remaining channel quality information, and the maximum channel quality information, provided as feedback information from each reception apparatus; selecting one of the single-user mode and the multi-user mode as a transmission mode depending on a comparison result between the sum rate (R_MU) in the multi-user mode and the sum rate (R_SU) in the single-user mode; and transmitting a data stream according to the selected transmission mode. - View Dependent Claims (24, 25, 26, 27, 28)
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29. An apparatus for transmitting data in a closed-loop multi-antenna system that defines multiple antenna groups by antenna grouping on multiple antennas, and performs data transmission individually via each of the multiple antenna groups, the apparatus comprising:
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a feedback information processor for receiving, from multiple reception apparatuses, feedback information including maximum channel quality information, an antenna group index associated with the maximum channel quality information, rank information, and remaining channel quality information, calculating a sum rate (R_MU) in a multi-user mode based on the maximum channel quality information and the antenna group index, provided as the feedback information from each reception apparatus, calculating a sum rate (R_SU) in a single-user mode based on the rank information, the remaining channel quality information, and the maximum channel quality information, provided as the feedback information from each reception apparatus, and selecting one of the single-user mode and the multi-user mode as a transmission mode depending on a comparison result between the sum rate (R_MU) in the multi-user mode and the sum rate (R_SU) in the single-user mode, selecting one of the single-user mode and the multi-user mode as the transmission mode depending on the feedback information, and performing control according to the selected transmission mode; and a transmitter for receiving a data stream to be transmitted to each reception apparatus, and transmitting the data stream according to one of the multi-user mode and the single-user mode under control of the feedback information processor. - View Dependent Claims (30, 31, 32, 33, 34)
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Specification