Wireless communication system, wireless communication apparatus, and wireless communication method
First Claim
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1. A wireless communication system for transmitting spatially multiplexed streams from a first terminal including a first number of antennas to a second terminal including a second number of antennas, the first number being an integer equal to or greater than two, and the second number being an integer equal to or greater than one, the system comprising:
- notifying means for notifying the second terminal of a maximum dimension when computing a transmission weight matrix for beamforming of the first terminal, the maximum dimension being an integer equal to or less than the first number;
training means for transmitting a packet including a training sequence, from the first terminal to the second terminal, the training sequence corresponding to the first number of antennas of the first terminal and the second number of antennas of the second terminal;
channel matrix estimation means for dividing the training sequence received by the antennas of the second terminal into a second number of streams and estimating a channel matrix;
channel information feedback means for suppressing a dimension number of the channel matrix estimated by the second terminal to a third number of rows and the first number of columns, and feeding back the suppressed channel matrix to the first terminal in consideration of the maximum dimension when computing the transmission weight matrix for beamforming in the first terminal, if the first number is less than the second number, wherein the third number is equal to or less than the maximum dimension;
transmission weight matrix computation means for obtaining the transmission weight matrix for beamforming when transmitting data from the first terminal to the second terminal using the channel matrix having the third number of rows and the first number of columns fed back from the second terminal to the first terminal; and
beamforming means for performing beamforming in transmission signals of the antennas of the first terminal using the transmission weight matrix for beamforming when a data packet is transmitted from the first terminal to the second terminal.
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Abstract
A wireless communication system is disclosed. The wireless communication system performs data transmission using spatially multiplexed streams from a first terminal including N antennas to a second terminal including M antennas (N and M are integers larger than or equal to 2 and N>H).
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Citations
12 Claims
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1. A wireless communication system for transmitting spatially multiplexed streams from a first terminal including a first number of antennas to a second terminal including a second number of antennas, the first number being an integer equal to or greater than two, and the second number being an integer equal to or greater than one, the system comprising:
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notifying means for notifying the second terminal of a maximum dimension when computing a transmission weight matrix for beamforming of the first terminal, the maximum dimension being an integer equal to or less than the first number; training means for transmitting a packet including a training sequence, from the first terminal to the second terminal, the training sequence corresponding to the first number of antennas of the first terminal and the second number of antennas of the second terminal; channel matrix estimation means for dividing the training sequence received by the antennas of the second terminal into a second number of streams and estimating a channel matrix; channel information feedback means for suppressing a dimension number of the channel matrix estimated by the second terminal to a third number of rows and the first number of columns, and feeding back the suppressed channel matrix to the first terminal in consideration of the maximum dimension when computing the transmission weight matrix for beamforming in the first terminal, if the first number is less than the second number, wherein the third number is equal to or less than the maximum dimension; transmission weight matrix computation means for obtaining the transmission weight matrix for beamforming when transmitting data from the first terminal to the second terminal using the channel matrix having the third number of rows and the first number of columns fed back from the second terminal to the first terminal; and beamforming means for performing beamforming in transmission signals of the antennas of the first terminal using the transmission weight matrix for beamforming when a data packet is transmitted from the first terminal to the second terminal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A wireless communication system for transmitting spatially multiplexed streams from a first terminal including a first number of antennas to a second terminal including a second number of antennas, the first number being an integer equal to or greater than two, and the second number being an integer equal to or greater than one, the system comprising:
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training means for transmitting a packet including a training sequence from the first terminal to the second terminal, the training sequence corresponding to the first number of antennas of the first terminal and the second number of antennas of the second terminal; channel matrix estimation means for dividing the training sequence received by the antennas of the second terminal into the second number of streams, and estimating a channel matrix including the second number of rows and the first number of columns; channel information feedback means for feeding back the channel matrix estimated in the second terminal to the first terminal; transmission weight matrix computation means for computing a transmission weight matrix for beamforming when transmitting data from the first terminal to the second terminal in a range of the channel matrix fed back from the second terminal to the first terminal, in consideration of the first number of antennas of the first terminal, the range including the first number of rows and the first number of columns; and beamforming means for performing beamforming in signals to be transmitted via the antennas of the first terminal using the transmission weight matrix for beamforming, when a data packet is transmitted from the first terminal to the second terminal. - View Dependent Claims (9, 10)
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11. A wireless communication system for transmitting spatially multiplexed streams from a first terminal including a first number of antennas to a second terminal including a second number of antennas, the first number being an integer equal to or greater than two, and the second number being an integer equal to or greater than one, the system comprising:
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a notifying unit to notify the second terminal of a maximum dimension when computing a transmission weight matrix for beamforming of the first terminal, the maximum dimension being an integer equal to or less than the second number; a training unit to transmit a packet including a training sequence from the first terminal to the second terminal, the packet corresponding to the first number of antennas of the first terminal and the second number of antennas of the second terminal; a channel matrix estimation unit to divide the training sequence received by the antennas of the second terminal into the second number of streams and to estimate a channel matrix; a channel information feedback unit to suppress the channel matrix estimated by the second terminal to a third number of rows and the first number of columns, and to feed back the suppressed channel matrix to the first terminal in consideration of the maximum dimension when computing the transmission weight matrix for beamforming in the first terminal, in a case that the first number is less than the second number; a transmission weight matrix computation unit to compute the transmission weight matrix for beamforming when transmitting data from the first terminal to the second terminal using the channel matrix having the third number of rows and the first number of columns fed back from the second terminal to the first terminal; and a beamforming unit to perform beamforming in signals to be transmitted via the antennas of the first terminal using the transmission weight matrix for beamforming, when a data packet is transmitted from the first terminal to the second terminal.
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12. A wireless communication system for transmitting spatially multiplexed streams from a first terminal including a first number of antennas to a second terminal including a second number of antennas, the first number being an integer equal to or greater than two, and the second number being an integer equal to or greater than one, the system comprising:
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a training unit to transmit a packet including a training sequence from the first terminal to the second terminal, the packet corresponding to the first number of antennas of the first terminal and the second number of antennas of the second terminal; a channel matrix estimation unit to divide the training sequence received by the antennas of the second terminal into the second number of streams, and to estimate a channel matrix having the second number of rows and the first number of columns; a channel information feedback unit to feed back the channel matrix estimated in the second terminal to the first terminal; a transmission weight matrix computation unit to compute a transmission weight matrix for beamforming when transmitting data from the first terminal to the second terminal in a range of the channel matrix fed back from the second terminal to the first terminal, in consideration of the first number of antennas of the first terminal, the range including the first number of rows and the first number of columns; and a beamforming unit to perform beamforming on signals to be transmitted via the antennas of the first terminal using the transmission weight matrix for beamforming, when a data packet is transmitted from the first terminal to the second terminal.
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Specification