Method and apparatus for allocating transmission power in communication system with multiple antennas
First Claim
1. A method for allocating transmission power in a communication system including multiple antennas including a plurality of subcarriers grouped by a plurality of groups, each group including at least one subcarrier, the method comprising:
- calculating a first transmission power weight for each group by using channel information;
calculating an antenna transmission vector for each group by using the channel information;
calculating a transmission power for each group of each antenna by using the first transmission power weight and the antenna transmission vector for each group;
determining transmission signals to be transmitted from the multiple antennas by using the transmission power; and
transmitting the transmission signals through the multiple antennas;
wherein, when transmittable power for each antenna is low, the calculating the transmission power comprises;
calculating a first transmission vector by using the first transmission power weight and the antenna transmission vector for each group;
calculating a second transmission power weight for each antenna for allocating the transmission power by using the first transmission power weight for each group and the transmittable power for each antenna; and
calculating a second transmission vector used for the transmission power by using the first transmission vector and the first transmission power weight of each antenna.
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Accused Products
Abstract
In a method for allocating transmission power in a communication system including multiple antennas, a plurality of subcarriers are grouped by a plurality of groups, and each group includes at least one subcarrier. A transmission power weight and an antenna transmission vector are calculated for each group by using channel information, a transmission power for each group of each antenna is calculated by using the transmission power weight and the antenna transmission vector for each group, and transmission signals are transmitted through the multiple antennas after determining which signals need to be transmitted from the multiple antennas by using the transmission power.
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Citations
22 Claims
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1. A method for allocating transmission power in a communication system including multiple antennas including a plurality of subcarriers grouped by a plurality of groups, each group including at least one subcarrier, the method comprising:
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calculating a first transmission power weight for each group by using channel information; calculating an antenna transmission vector for each group by using the channel information; calculating a transmission power for each group of each antenna by using the first transmission power weight and the antenna transmission vector for each group; determining transmission signals to be transmitted from the multiple antennas by using the transmission power; and transmitting the transmission signals through the multiple antennas; wherein, when transmittable power for each antenna is low, the calculating the transmission power comprises; calculating a first transmission vector by using the first transmission power weight and the antenna transmission vector for each group; calculating a second transmission power weight for each antenna for allocating the transmission power by using the first transmission power weight for each group and the transmittable power for each antenna; and calculating a second transmission vector used for the transmission power by using the first transmission vector and the first transmission power weight of each antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for allocating transmission power in a communication system including multiple antennas, including a plurality of subcarriers grouped by a plurality of groups, and each group includes at least one subcarrier, the method comprising:
- receiving a code book index and a power weight from a receiver;
calculating a first transmission power weight for each group from the power weight, calculating an antenna transmission vector for each group from the code book index; calculating a transmission power for each group of each antenna by using the first transmission power weight and the antenna transmission vector for each group;
determining transmission signals to be transmitted from the multiple antennas by using the transmission power; and
transmitting the transmission signals through the multiple antennas;wherein, when transmittable power for each antenna is limited, calculating the transmission power comprises; calculating a first transmission vector by using the first transmission power weight and the antenna transmission vector for each group; calculating a second transmission power weight for each antenna for allocating the transmission power by using the first transmission power weight for each group and the transmittable power for each antenna; and calculating a second transmission vector used for the transmission power by using the first transmission vector and the second transmission power weight for each antenna. - View Dependent Claims (13, 14, 15, 16, 17, 18)
- receiving a code book index and a power weight from a receiver;
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19. An apparatus for allocating transmission power in a communication system including multiple antennas, wherein a plurality of subcarriers are grouped by a plurality of groups, each group including at least one subcarrier, the apparatus comprising:
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a channel information module for storing channel information for each group; a transmission power weight module for calculating a first transmission power weight for each group by using the channel information; an antenna transmission vector determination module for calculating an antenna transmission vector for each group by using the channel information; a power allocation module for calculating a transmission power for each group of each antenna by using the first transmission power weight and the antenna transmission vector for each group; and a transmission signal determination module for determining transmission signals to be transmitted through the multiple antennas by using the transmission power; wherein, when a transmittable power for each antenna is low, the power allocation module comprises; a first transmission vector determination module for calculating a first transmission vector by using the first transmission power weight and the antenna transmission vector for each group; a transmission power control module for each antenna for calculating a second transmission power weight for each antenna for allocating the transmission power by using the first transmission power weight for each group and the transmittable power for each antenna; and a second transmission vector determination module for calculating the second transmission vector used for the transmission power by using the first transmission vector and the transmission power weight for each antenna.
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20. An apparatus for allocating for transmission power in a communication system including multiple antennas, including a plurality of subcarriers grouped by a plurality of groups, each group including at least one subcarrier, the apparatus comprising:
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a transmission power control module for calculating, from a power weight, a first transmission power weight for each group; an antenna transmission vector determination module for calculating, from a code book index, an antenna transmission vector for each group; a power allocation module for calculating a transmission power for each group of each antenna by using the first transmission power weight and the antenna transmission vector for each group; and a transmission signal determination module for determining transmission signals to be transmitted through the multiple antennas by using the transmission power; wherein, when transmittable power for each antenna is low, the power allocation module comprises; a first transmission vector determination module for calculating a first transmission vector by using the first transmission power weight and the antenna transmission vector for each group; a transmission power control module for each antenna for calculating a second transmission power weight for each antenna for allocating the transmission power by using the first transmission power weight for each group and the transmittable power for each antenna; and
a second transmission vector determination module for calculating the second transmission vector used for the transmission power by using the first transmission vector and the second transmission power weight for each antenna. - View Dependent Claims (21, 22)
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Specification