| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a communication device, a communication method and a communication system which can stabilize communication in communication using directivity. Ž<P>SOLUTION: The communication device includes a first communicating unit that communicates using a carrier of first frequency, a second communicating unit that has a plurality of antennas and communicates using a carrier of second frequency, a first communication processing unit that processes a signal received by the first communicating unit and allows the first communicating unit to transmit a signal, and a second communication processing unit that processes a signal received by the second communicating unit and allows the second communicating unit to transmit a signal. The second communication processing unit includes an adjusting unit that adjusts a signal transmitted by deriving an adjustment factor based on a loopback transfer function among the plurality of antennas, a transmission beam pattern candidate setting unit that derives a transmission beam pattern based on a first transmission request and a second transmission request to set the derived transmission beam pattern as a transmission beam pattern candidate, and a beam pattern applying unit that applies the transmission beam pattern candidate to a signal to be transmitted based on first requested-beam-pattern identification information. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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