Wireless communication system, wireless communication apparatus, wireless communication method, and computer program therefor
First Claim
1. A wireless communication system for performing data communication by using a plurality of spatially multiplexed communication channels between a transmitter and a receiver, wherein in the transmitter, a transmission power is allocated to each of the communication channels, mapped in signal spacing, and spatially multiplexed, whereby data communication is performed;
- and in the receiver, power allocation information of the each communication channel is acquired, received data is spatially separated, and demapping is performed in accordance with the power allocation information.
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Accused Products
Abstract
Communication operation is performed with enhanced transmission efficiency by obtaining enhanced communication capacity through optimal allocation of transmission powers to individual MIMO channels obtainable by spatial multiplexing. A transmitter has a plurality of transmission antennas and a receiver has a plurality of reception antennas and perform spatial multiplex communication through transmission and reception with individual antenna weights being set. The transmitter varies the power allocation in units of a communication channel in correspondence to communication quality of the channel. The receiver uses a power allocation value of each communication channel that is estimated in accordance with a reception power of a pilot carrier included in user data after spatially separated. Thereby, the receiver returns the magnitude of the amplitude of a received signal in the signal spacing to an original magnitude, and performs an accurate demapping process.
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Citations
28 Claims
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1. A wireless communication system for performing data communication by using a plurality of spatially multiplexed communication channels between a transmitter and a receiver, wherein
in the transmitter, a transmission power is allocated to each of the communication channels, mapped in signal spacing, and spatially multiplexed, whereby data communication is performed; - and
in the receiver, power allocation information of the each communication channel is acquired, received data is spatially separated, and demapping is performed in accordance with the power allocation information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless communication apparatus for receiving data transmitted by using a plurality of spatially multiplexed communication channels, wherein a transmission power is allocated to each of the communication channels on the side of the transmitter, the wireless communication apparatus comprising:
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receiving means that receives a signal from each of the communication channel and performs spatially separation thereof;
power allocation information acquisition means that acquires power allocation information of the each communication channel; and
demodulating means that performs demapping of a reception signal in the each communication channel spatially separated in accordance with the power allocation information acquired. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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27. A wireless communication method for receiving data transmitted by using a plurality of spatially multiplexed communication channels, wherein a transmission power is allocated to each of the communication channels on the side of the transmiteer side, the wireless communication apparatus comprising:
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a receiving step that receives a signal from each of the communication channel and performs spatial separation thereof;
a power allocation information acquisition step that acquires power allocation information of the each communication channel; and
a demodulating step that performs demapping of a reception signal in the each communication channel spatially separated in accordance with the power allocation information acquired.
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28. A computer program written in a computer readable format to execute a process of receiving data transmitted by using a plurality of spatially multiplexed communication channels, wherein a transmission power is allocated to each of the communication channels on the side of a transmitter, the computer program comprising:
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a receiving step that receives a signal from each of the communication channel and performs spatial separation thereof;
a power allocation information acquisition step that acquires power allocation information of the each communication channel; and
a demodulating step that performs demapping of a reception signal in the each communication channel spatially separated in accordance with the power allocation information acquired.
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Specification