Transmit power allocation for adaptive multi-carrier multiplexing MIMO systems
First Claim
1. A method of assigning transmit power in a multiple-input-multiple-output (MIMO) two-stream transmission, the method comprising:
- receiving a first symbol stream associated with a plurality of subcarriers in accordance with constellation information contained in a first tonemap, the first tonemap including first information indicating subcarriers of the plurality of subcarriers that are not used for transmitting data;
receiving a second symbol stream associated with the plurality of subcarriers in accordance with constellation information in a second tone map, the second tonemap including second information indicating subcarriers of the plurality of subcarriers that are not used for transmitting data;
reallocating, by the circuitry according to the first tonemap when a subcarrier for the first symbol stream is not used for transmitting data and the corresponding subcarrier for the second symbol stream is used for transmitting data, all of the transmit power of the subcarrier of the first symbol stream to the corresponding subcarrier of the second symbol stream; and
reallocating, by the circuitry according to the second tonemap when a corresponding subcarrier for the second symbol stream is not used for transmitting data and the subcarrier for the first symbol stream is used for transmitting data, all of the transmit power of the subcarrier of the second symbol stream to the subcarrier of the first symbol stream.
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Abstract
The present invention relates to transmit power allocation in multi-carrier, multiplexing MIMO communication systems. The present invention especially relates to a MIMO communication device, a method of assigning transmit power to two or more communication channels and a software program product. A multiple-input-multiple-output, MIMO, communication device according to the present invention comprises a link controller adapted to assign transmit power to two or more transmission channels, each of said transmission channels having preassigned a portion of transmit power for each of a group of subcarriers, said link controller being further adapted to assign, for each subcarrier of said group of subcarriers, at least part of the preassigned transmit power portion of a transmission channel that is not used for transmitting information at the subcarrier, to one or more transmission channels that are used for transmitting information at the subcarrier.
13 Citations
20 Claims
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1. A method of assigning transmit power in a multiple-input-multiple-output (MIMO) two-stream transmission, the method comprising:
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receiving a first symbol stream associated with a plurality of subcarriers in accordance with constellation information contained in a first tonemap, the first tonemap including first information indicating subcarriers of the plurality of subcarriers that are not used for transmitting data; receiving a second symbol stream associated with the plurality of subcarriers in accordance with constellation information in a second tone map, the second tonemap including second information indicating subcarriers of the plurality of subcarriers that are not used for transmitting data; reallocating, by the circuitry according to the first tonemap when a subcarrier for the first symbol stream is not used for transmitting data and the corresponding subcarrier for the second symbol stream is used for transmitting data, all of the transmit power of the subcarrier of the first symbol stream to the corresponding subcarrier of the second symbol stream; and reallocating, by the circuitry according to the second tonemap when a corresponding subcarrier for the second symbol stream is not used for transmitting data and the subcarrier for the first symbol stream is used for transmitting data, all of the transmit power of the subcarrier of the second symbol stream to the subcarrier of the first symbol stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A multiple-input-multiple-output (MIMO) communication device, comprising:
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a first symbol mapper circuit configured to receive a first data stream, perform a symbol mapping on the first data stream according to a first tone map for a plurality of subcarriers, and output a first symbol stream, the first tonemap including first information indicating subcarriers of the plurality of subcarriers that are not used for transmitting data; a second symbol mapper circuit configured to receive a second data stream, perform a symbol mapping on the second data stream according to a second tone map for the plurality of subcarriers and output a second symbol stream, the second tonemap including second information indicating subcarriers of the plurality of subcarriers that are not used for transmitting data; and a power allocation circuit configured to receive the first and second symbol streams, reallocate according to the first tonemap, when a subcarrier for the first symbol stream is not used for transmitting data and the corresponding subcarrier for the second symbol stream is used for transmitting data, all of the transmit power of the subcarrier of the first symbol stream to the corresponding subcarrier of the second symbol stream, and reallocate according to the second tonemap, when a corresponding subcarrier for the second symbol stream is not used for transmitting data and the subcarrier for the first symbol stream is used for transmitting data, all of the transmit power of the subcarrier of the second symbol stream to the subcarrier of the first symbol stream. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification