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US 8,289,869 B2Granted
Wireless communication system, wireless communication device and wireless communication method, and computer program
AssigneeSony Corporation
InventorRyo Sawai
Life of this patent
Estimating the term…
Abstract
A wireless communication system which includes a transmitter and receiver each having two or more antennae, the system including: a channel condition determining unit which determines a condition of a channel between the transmitter and the receiver; and a system control unit which changes a transmitting system in the transmitter and a receiving system in the receiver in accordance with a determination result obtained by the channel condition determining unit.
Claims26
A wireless communication system which includes a transmitter and a receiver each having two or more antennae, the system comprising:
- a channel condition determining unit which determines a condition of a channel between the transmitter and the receiver;
- and
- a system control unit which changes an antenna transmitting weight matrix that weights each antenna of a transmitting system in the transmitter and an antenna receiving weight matrix that weights each antenna of a receiving system in the receiver in accordance with a determination result obtained by the channel condition determining unit,
- wherein the channel condition determining unit calculates one of a determinant of a channel matrix and a rank of an eigenvalue estimated between the transmitter and the receiver to determine a number of streams to be used for communication and a modulating system to be used for communication,
- the system control unit adopts both a transmitting and a receiving system based on a linear area equalization algorithm when communication is established with the number of streams and modulating system within the determination result obtained by the channel condition determining unit, and the system control unit cancels adaptation of the transmitting system based on a linear area equalization algorithm and adopts a receiving system based on a non-linear area equalization algorithm when communication is established with the number of streams and modulating system outside of the determination result of the channel condition determining unit, and
- the receiver returns a response packet with NonValid Sounding when a link adaptation request is received from an M-antenna transmitter in which the number of the streams is specified.
3 more elements
A wireless communication device comprising:
- two or more antennae;
- a channel condition determining unit which determines a condition of a channel with a communication partner;
- a communication unit which transmits and receives a packet;
- and
- a system control unit which switches antenna weighting matrices that weight each antenna in transmitting and receiving systems in the communication unit in accordance with a determination result obtained by the channel condition determining unit,
- wherein the channel condition determining unit calculates one of a determinant of a channel matrix and a rank of an eigenvalue estimated between the wireless communication device and the communication partner to determine a number of streams that can be used for communication and a modulating system that can be used for communication;
- and
- the system control unit adopts both a transmitting and a receiving system on a linear area equalization algorithm when communication is established with a number of streams and modulating system within the determination result of the channel condition determining unit, and the system control unit cancels adaptation of the transmitting system based on a linear area equalization algorithm and adopts a receiving system based on a non-linear area equalization algorithm when communication is established with the number of streams and modulating system outside of the determination result of the channel condition determining unit, and
- the receiving system returns a response packet with NonValid Sounding when a link adaptation request is received from an M-antenna transmitter in which the number of the streams is specified.
6 more elements
A wireless communication method using two or more antennae, the method comprising:
- determining a condition of a channel with a communication partner;
- performing a communication by transmitting and receiving a packet;
- and
- performing system control by switching antenna weighting matrices that weight each antenna in transmitting and receiving systems in accordance with a determination result obtained by a channel condition determining unit,
- wherein a determinant of a channel matrix and a rank of an eigenvalue estimated relative to the communication partner to determine a number of streams that can be used for communication and a modulating system that can be used for communication;
- and
- both a transmitting system and a receiving system are adopted based on a linear area equalization algorithm when communication is established with a number of streams and modulating system within the determination result of the channel condition determining unit, and
- adaptation of the transmitting system based on a linear area equalization algorithm is canceled and a receiving system based on a non-linear area equalization algorithm is adopted when communication is established with the number of streams and modulating system outside of the determination result of the channel condition determining unit, and
- the receiving system returns a response packet with NonValid Sounding when a link adaptation request is received from an M-antenna transmitter in which the number of the streams is specified.
6 more elements
A non-transitory computer-readable medium storing computer-readable instructions thereon, the computer-readable instructions when executed by a computer cause the computer to perform a wireless communication method using two or more antennae on the computer, comprising:
- determining a condition of a channel with a communication partner;
- transmitting and receiving a packet;
- and
- switching between antenna weighting matrices that weight each antenna in transmitting and receiving systems in the communication unit in accordance with a determination result obtained by the channel condition determining unit,
- wherein a determinant of a channel matrix and a rank of an eigenvalue estimated relative to the communication partner to determine a number of streams that can be used for communication and a modulating system that can be used for communication;
- and
- both a transmitting system and a receiving system is adopted based on a linear area equalization algorithm when communication is established with a number of streams and modulating system within the determination result of the channel condition determining unit, and
- adaptation of the transmitting system based on a linear area equalization algorithm is canceled and a receiving system based on a non-linear area equalization algorithm is adopted when communication is established with the number of streams and modulating system outside of the determination result of the channel condition determining unit, and
- the receiving system returns a response packet with NonValid Sounding when a link adaptation request is received from an M-antenna transmitter in which the number of the streams is specified.
6 more elements
Dependencies are inferred from the claim text.