Wireless communication system, wireless communication apparatus and wireless communication method
AssigneeSony Corporation
InventorTomoya Yamaura
Life of this patent
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Abstract
A wireless communication system which 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 and N<M) is disclosed. The system includes training request means, training means, channel matrix preparing means, transmission weight matrix computation means, and beamforming means.
Claims13
A wireless communication system which performs data transmission from a first terminal including N antennas to a second terminal including M antennas using spatially multiplexed streams (N is an integer of 2 or more and M is an integer of 1 or more), the system comprising:
- training request means for requesting transmission of a training signal for exciting a backward channel from the first terminal to the second terminal;
- training means for transmitting a packet including training series for exciting an N×M backward channel matrix from the second terminal to the first terminal in response to the request;
- channel matrix preparing means for dividing the training series received by the antennas of the first terminal and constructing the backward channel matrix;
- transmission weight matrix computation means for obtaining a N×N transmission weight matrix for beamforming at the time of forward data transmission using an N×N channel matrix composed of N columns included in the backward channel matrix in consideration of the number N of antennas of the first terminal, in a case of N<M;
- 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.
A wireless communication apparatus which includes N antennas and performs data transmission using spatially multiplexed streams to a second terminal including M antennas (N is an integer of 2 or more and M is an integer of 1 or more), the apparatus comprising:
- training request means, for requesting the second terminal to transmit a training signal for exciting a backward channel;
- channel matrix preparing means for dividing training series of the antennas for receiving a packet including the training series transmitted from the second terminal into streams and constructing the backward channel matrix in response to the request;
- transmission weight matrix computation means for obtaining an N×N transmission weight matrix for beamforming at the time of forward data transmission using an N×N channel matrix composed of N columns included in the backward channel matrix in consideration of the number N of its own antennas, in a case of N<M;
- and
- beamforming means for performing beamforming in transmission signals from the antennas using the transmission weight matrix for beamforming when a data packet is transmitted to the second terminal.
A wireless communication method in a wireless communication apparatus which includes N antennas and performs data transmission using spatially multiplexed streams to a second terminal including M antennas (N is an integer of 2 or more and M is an integer of 1 or more), the method comprising the steps of:
- requesting the second terminal to transmit a training signal for exciting a backward channel;
- dividing training series of the antennas for receiving a packet including the training series transmitted from the second terminal into streams and constructing the backward channel matrix in response to the request;
- obtaining an N×N transmission weight matrix for beamforming at the time of forward data transmission using an N×N channel matrix composed of N columns included in the backward channel matrix in consideration of the number N of its own antennas, in a case of N<M;
- and
- performing beamforming in transmission signals from the antennas using the transmission weight matrix for beamforming when a data packet is transmitted to the second terminal.
A wireless communication system which performs data transmission from a first terminal including N antennas to a second terminal including M antennas using spatially multiplexed streams (N is an integer of 2 or more and M is an integer of 1 or more), the system comprising:
- a training request unit which requests transmission of a training signal for exciting a backward channel from the first terminal to the second terminal;
- a training unit which transmits a packet including training series for exciting an N×M backward channel matrix from the second terminal to the first terminal in response to the request;
- a channel matrix preparing unit which divides the training series received by the antennas of the first terminal and constructs the backward channel matrix;
- a transmission weight matrix computation unit which obtains a N×N transmission weight matrix for beamforming at the time of forward data transmission using an N×N channel matrix composed of N columns included in the backward channel matrix in consideration of the number N of antennas of the first terminal, in a case of N<M;
- and
- a beamforming unit which performs 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.
A wireless communication apparatus which includes N antennas and performs data transmission using spatially multiplexed streams to a second terminal including M antennas (N is an integer of 2 or more and M is an integer of 1 or more), the apparatus comprising:
- a training request unit which requests the second terminal to transmit a training signal for exciting a backward channel;
- a channel matrix preparing unit which divides training series of the antennas for receiving a packet including the training series transmitted from the second terminal into streams and constructs the backward channel matrix in response to the request;
- a transmission weight matrix computation unit which obtains an N×N transmission weight matrix for beamforming at the time of forward data transmission using an N×N channel matrix composed of N columns included in the backward channel matrix in consideration of the number N of its own antennas, in a case of N<M;
- and
- a beamforming unit which performs beamforming in transmission signals from the antennas using the transmission weight matrix for beamforming when a data packet is transmitted to the second terminal.
Dependencies are inferred from the claim text.