Wireless communication system, wireless communication apparatus, and wireless communication method
First Claim
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1. A wireless communication system for performing data transmission from a first terminal including a first number of antennas to a second terminal including a second number of antennas using spatially multiplexed streams, 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 channel estimation maximum dimension of the first terminal;
training means for transmitting a packet from the second terminal to the first terminal according to the channel estimation maximum dimension of the first terminal and the first number of antennas, the packet including a training series for exciting a backward channel matrix having the first number of rows and a third number of columns, the third number being an integer equal to or less than the channel estimation maximum dimension;
transmission weight matrix computation means for dividing the training series received by the antennas of the first terminal into the third number of streams to prepare the backward channel matrix, thereby obtaining a transmission weight matrix for beamforming when transmitting forward data using the backward channel matrix; and
beamforming means for performing beamforming in transmission signals from 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 system performs data transmission from a first terminal including N antennas to a second terminal including M antennas using spatially multiplexed streams (N and M are integers larger than or equal to 2).
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Citations
51 Claims
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1. A wireless communication system for performing data transmission from a first terminal including a first number of antennas to a second terminal including a second number of antennas using spatially multiplexed streams, 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 channel estimation maximum dimension of the first terminal;
training means for transmitting a packet from the second terminal to the first terminal according to the channel estimation maximum dimension of the first terminal and the first number of antennas, the packet including a training series for exciting a backward channel matrix having the first number of rows and a third number of columns, the third number being an integer equal to or less than the channel estimation maximum dimension;
transmission weight matrix computation means for dividing the training series received by the antennas of the first terminal into the third number of streams to prepare the backward channel matrix, thereby obtaining a transmission weight matrix for beamforming when transmitting forward data using the backward channel matrix; and
beamforming means for performing beamforming in transmission signals from 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, 8, 9, 10, 11, 12, 13, 14)
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15. A wireless communication apparatus including a first number of antennas for transmitting data to a receiver including a second number of antennas, using spatially multiplexed streams, 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 apparatus comprising:
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notifying means for notifying the receiver terminal with a channel estimation maximum dimension of the apparatus;
training packet receiving means for receiving a packet including a training series for exciting a backward channel matrix having the first number of rows and a third number of columns from the receiver in correspondence with the channel estimation maximum dimension and the first number of antennas, the third number being equal to or less than the channel estimation maximum dimension;
transmission weight matrix computation means for dividing the training series received by the antennas of the receiver into the third number of streams to prepare the backward channel matrix, thereby obtaining a transmission weight matrix for beamforming when transmitting forward data using the backward channel matrix; and
packet transmitting means for beamforming signals to be transmitted from the antennas of the first terminal using the transmission weight matrix for beamforming, and transmitting a data packet derived from the signals to be transmitted to the receiver. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A wireless communication apparatus including a first number of antennas for receiving spatially multiplexed streams from an initiator including a second number of antennas, the second number being an integer equal to or greater than two, and the first number being an integer equal to or greater than one, the apparatus comprising:
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notification receiving means for receiving notification of a channel estimation maximum dimension of the initiator;
training packet transmitting means for transmitting a packet including training series for exciting a backward channel matrix having the second number of rows and a third number of columns to the initiator in correspondence with the channel estimation maximum dimension of a first terminal and the second number of antennas of the first terminal, the third number being equal to or less than the channel estimation maximum dimension;
data packet receiving means for receiving a data packet from the initiator, the data packet being beamformed in a transmission weight matrix for beamforming obtained from an estimation channel matrix based on the training series; and
space division means for multiplying a reception vector, composed of signals received by the antennas of the apparatus, by a reception weight matrix obtained from a forward estimation channel matrix, and spatially decoding a spatially multiplexed signal. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41)
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42. A wireless communication method for transmitting spatially multiplexed streams from an initiator including a first number of antennas to a receiver 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 larger than one, the method comprising the steps of:
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notifying the receiver of a channel estimation maximum dimension of the receiver;
receiving a packet including a training series for exciting a backward channel matrix having the first number of rows and a third number of columns from the receiver in correspondence with the channel estimation maximum dimension and the first number of antennas, the third number being equal to or less than the channel estimation maximum dimension;
dividing the training series received by the antennas of the receiver into the third number of streams to prepare the backward channel matrix, thereby obtaining a transmission weight matrix for beamforming when transmitting forward data using the backward channel matrix; and
beamforming signals to be transmitted from the antennas of the initiator using the transmission weight matrix for beamforming, and transmitting a data packet derived from the signals to be transmitted to the receiver.
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43. A wireless communication method for receiving spatially multiplexed streams transmitted from an initiator including a first number of antennas to a receiver 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 method comprising the steps of:
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receiving a channel estimation maximum dimension of the initiator;
transmitting a packet including training series for exciting a backward channel matrix having a first number of rows and a third number of columns to the initiator in correspondence with the channel estimation maximum dimension of a initiator and the first number of antennas of the initiator;
receiving a data packet beamformed in a transmission weight matrix for beamforming obtained from an estimation channel matrix based on the training series, from the initiator; and
multiplying a reception vector, comprised of signals received by the antennas of the receiver, by a reception weight matrix obtained from a forward estimation channel matrix, and spatially decoding a spatially multiplexed signal.
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44. A wireless communication system for transmitting specially 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, which notifies the second terminal with a channel estimation maximum dimension of the first terminal;
a training unit, which transmits a packet including a training series for exciting a backward channel matrix having the first number of rows and a third number columns, from the second terminal to the first terminal in correspondence with the channel estimation maximum dimension of the first terminal and the first number of antennas of the first terminal, the third number being equal to or less than the channel estimation maximum dimension;
a transmission weight matrix computation unit, which divides the training series received by the antennas of the first terminal into the third number of streams to prepare the backward channel matrix, thereby obtaining a transmission weight matrix for beamforming when transmitting forward data using the backward channel matrix; and
a beamforming unit, which performs beamforming in signals transmitted from 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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45. A wireless communication apparatus having a first number of antennas for transmitting spatially multiplexed streams to a receiver 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 apparatus comprising:
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a notifying unit, which notifies the receiver with a channel estimation maximum dimension of the receiver;
a training packet receiving unit, which receives a packet including a training series for exciting a backward channel matrix having the first number of rows and a third number of columns from the receiver terminal in correspondence with the channel estimation maximum dimension and the first number of antennas, the third number being equal to or less than the channel estimation maximum dimension;
a transmission weight matrix computation unit, which divides the training series received by the antennas into the third number of streams to prepare the backward channel matrix, thereby obtaining a transmission weight matrix for beamforming when transmitting forward data using the backward channel matrix; and
a packet transmitting unit, which performs beamforming in signals to be transmitted from the antennas of the first terminal using the transmission weight matrix for beamforming, and transmits a data packet derived from the signals to be transmitted to the receiver terminal.
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46. A wireless communication apparatus including a first number of antennas for receiving spatially multiplexed streams from an initiator terminal including a second number of antennas, the second number being an integer equal to or greater than two, and the first number being an integer equal to or greater than one, the apparatus comprising:
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a notification receiving unit, which receives notification of a channel estimation maximum dimension of the initiator;
a training packet transmitting unit, which transmits a packet including training series for exciting a backward channel matrix having the second number of rows and a third number of columns to the initiator in correspondence with the channel estimation maximum dimension of the initiator, and the second number of antennas of the initiator;
a data packet receiving unit, which receives a data packet beamformed in a transmission weight matrix for beamforming obtained from an estimation channel matrix based on the training series, from the initiator; and
a space division unit, which multiplies a reception vector composed of signals received by the antennas by a reception weight matrix obtained from a forward estimation channel matrix, and spatially decoding a spatially multiplexed signal.
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47. A method for wirelessly communicating between a beamformer having a first quantity of antennas and a beamformee having a second quantity of antennas, the method comprising:
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transmitting a channel estimation maximum dimension of the beamformer to the beamformee; and
establishing a wireless communication channel between the beamformer and the beamformee based on the channel estimation maximum dimension. - View Dependent Claims (48, 49, 50, 51)
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Specification