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, the wireless communication system comprising:
- a transmitter to allocate a transmission power to each of the communication channels, mapped in signal spacing, and spatially multiplexed, to perform data communication; and
a receiver to spatially separate received data, estimate power allocation information of each of the communication channels after the spatial separation of the received data in accordance with reception power of a pilot carrier included in user data, and demap based on the estimated 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.
40 Citations
22 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, the wireless communication system comprising:
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a transmitter to allocate a transmission power to each of the communication channels, mapped in signal spacing, and spatially multiplexed, to perform data communication; and a receiver to spatially separate received data, estimate power allocation information of each of the communication channels after the spatial separation of the received data in accordance with reception power of a pilot carrier included in user data, and demap based on the estimated power allocation information. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. 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 a transmitter, the wireless communication apparatus comprising:
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receiving means for receiving a signal from each of the communication channels and performing spatially separation thereof; power allocation information acquisition means for acquiring power allocation information for each of the communication channels by estimating after spatial separation of the signal received by the receiving means in accordance with reception power of a pilot carrier included in user data; and demodulating means for demapping a reception signal in each of the communication channels spatially separated in accordance with the acquired power allocation information. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A wireless communication method for receiving data transmitted by using a plurality of spatially multiplexed communication channels, wherein a respective 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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receiving a signal from each of the communication channels and performing spatial separation thereof; acquiring power allocation information for each of the communication channels by estimating after spatial separation of the signal received by the receiving means in accordance with reception power of a pilot carrier included in user data; and demapping a reception signal in each of the communication channels spatially separated in accordance with the power allocation information acquired.
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22. A non-transitory computer-readable storage medium storing therein a computer program written in a computer readable format, which, when executed by a processor, causes the processor to execute a method of receiving data transmitted by using a plurality of spatially multiplexed communication channels, wherein a respective transmission power is allocated to each of the communication channels on the side of a transmitter, the method comprising:
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receiving a signal from each of the communication channel and performing spatial separation thereof; acquiring power allocation information for each of the communication channels by estimating after spatial separation of the signal received by the receiving means in accordance with reception power of a pilot carrier included in user data; and demapping a reception signal in each of the communication channels spatially separated in accordance with the power allocation information acquired.
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Specification