Radio communication apparatus and a radio communication method
AssigneeNtt Docomo, Inc.
InventorsKenichi Higuchi, Noriyuki Maeda, Mamoru Sawahashi
Life of this patent
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Abstract
The radio communication apparatus includes two or more antennas, a receiving unit for receiving a notice signal from a communication partner, two or more units for changing the number of data sequences and for coupling to the antennas according to two or more transmitting methods out of a MIMO multiplexing method, a MIMO diversity method, and an adaptive array antenna method, a selecting unit for selecting at least one out of the two or more units based on the notice signal, and a transmitting unit for notifying the communication partner of the transmission method corresponding to the selected unit.
Claims39
A radio communication apparatus that includes a plurality of antennas, comprising:
- a receiving unit configured to receive a notice signal from a communication partner;
- a plurality of units configured to adjust the number of data sequences according to each of two or more transmission methods including a MIMO multiplexing method, a MIMO diversity method, and an adaptive array antenna method, and to couple with the two or more antennas;
- a selecting unit configured to select at least one the units based on the notice signal;
- and
- a transmitting unit configured to notify the communication partner of the transmission method corresponding to the selected unit.
A radio communication apparatus, comprising:
- a transmission phase storage unit for storing a phase rotation amount applied to a signal transmitted from a transmission antenna for each data modulation method and for each of transmission antenna;
- a channel estimating unit for estimating a channel using a pilot symbol;
- a transmission phase compensating unit for compensating for a value estimated by the channel estimating unit by the phase rotation amount;
- and
- a signal separation and decoding unit for separating and decoding a received signal based on the channel estimation value to which the compensation of the phase rotation is performed.
A radio communication apparatus having two or more antennas, comprising:
- a control information transmitting unit for transmitting a control channel according to one of a transmission method by one of the antennas, a method of transmitting the same data from the antennas, a MIMO multiplexing method, and a MIMO diversity method.
A radio communication method for a multi-antenna system, comprising:
- receiving a notice signal from a communication partner;
- selecting at least one of a MIMO multiplexing method, a MIMO diversity method, and an adaptive array antenna method based on the notice signal;
- and
- notifying the communication partner of the selected transmission method.
A radio communication method for a multi-antenna system, comprising:
- selecting a transmission method out of a transmission method by one antenna of two or more antennas, a method of transmitting the same data from the antennas, a MIMO multiplexing method, and a MIMO diversity method;
- and
- transmitting a control channel according to the selected transmission method.
Dependencies are inferred from the claim text.