Communication apparatus and communication method
First Claim
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1. A communication apparatus comprising:
- an evaluation value processing unit configured to calculate, upon receipt of known signals from a plurality of communication devices including a communication partner device, an evaluation value indicative of a characteristic of a transmission path based on the known signals from said plurality of communication devices; and
a transmission scheme setting unit configured to, based on said evaluation value, select between an adaptive array transmission scheme that utilizes both null steering and beamforming and an adaptive array transmission scheme that utilizes beamforming without null steering, and sets the selected adaptive array transmission scheme as a transmission scheme to the communication partner device.
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Abstract
Upon receipt of sounding signals from a plurality of communication devices including a communication partner device, an evaluation value processing unit calculates an evaluation value indicative of a characteristic of a transmission path based on the sounding signals from the plurality of communication devices. A transmission scheme setting unit sets, based on the evaluation value, adaptive array transmission that achieves both null steering and beamforming or beamforming dedicated transmission as a transmission scheme to the communication partner device.
8 Citations
18 Claims
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1. A communication apparatus comprising:
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an evaluation value processing unit configured to calculate, upon receipt of known signals from a plurality of communication devices including a communication partner device, an evaluation value indicative of a characteristic of a transmission path based on the known signals from said plurality of communication devices; and a transmission scheme setting unit configured to, based on said evaluation value, select between an adaptive array transmission scheme that utilizes both null steering and beamforming and an adaptive array transmission scheme that utilizes beamforming without null steering, and sets the selected adaptive array transmission scheme as a transmission scheme to the communication partner device. - View Dependent Claims (2, 3, 4)
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5. A communication apparatus comprising:
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an evaluation value processing unit configured to calculate, upon receipt of known signals from a plurality of communication devices including a communication partner device, an evaluation value indicative of a characteristic of a transmission path based on the known signals from said plurality of communication devices; and a transmission scheme setting unit configured to set, based on said evaluation value, one of adaptive array transmission that achieves both null steering and beamforming and beamforming dedicated transmission as a transmission scheme to the communication partner device, wherein upon receipt of the known signals from the plurality of communication devices including the communication partner device, said evaluation value processing unit sequentially selects other communication devices to be paired with the communication partner device, and calculates, for each pair, the evaluation value indicative of the characteristic of the transmission path based on the known signals from the communication devices constituting the pair, and said transmission scheme setting unit sets, based on said evaluation values for a plurality of pairs, one of said adaptive array transmission and said beamforming dedicated transmission as the transmission scheme to the communication partner device. - View Dependent Claims (6, 7)
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8. A communication apparatus comprising:
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an evaluation value processing unit configured to calculate, upon receipt of known signals from a plurality of communication devices including a communication partner device, an evaluation value indicative of a characteristic of a transmission path based on the known signals from said plurality of communication devices; and a transmission scheme setting unit configured to set, based on said evaluation value, one of adaptive array transmission that achieves both null steering and beamforming and beamforming dedicated transmission as a transmission scheme to the communication partner device, wherein said evaluation value processing unit calculates first communication quality when the known signal from the communication partner device is not subjected to adaptive array reception processing and second communication quality when the known signal from said communication partner device is subjected to adaptive array reception processing, and if a difference between said first communication quality and said second communication quality exceeds a predetermined threshold, said transmission scheme setting unit sets said adaptive array transmission as the transmission scheme to said communication partner device, and if the difference is less than or equal to the predetermined threshold, said transmission scheme setting unit sets said beamforming dedicated transmission as the transmission scheme to said communication partner device. - View Dependent Claims (9, 10)
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11. A communication apparatus comprising:
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an evaluation value processing unit configured to calculate first communication quality when an evaluation signal from a communication partner device is not subjected to adaptive array reception processing and second communication quality when the evaluation signal from the communication partner device is subjected to adaptive array reception processing, and a transmission scheme setting unit configured to, if a difference between said first communication quality and said second communication quality exceeds a predetermined threshold, set adaptive array transmission that achieves both null steering and beamforming as a transmission scheme to said communication partner device, and if the difference is less than or equal to the predetermined threshold, set beamforming dedicated transmission as the transmission scheme to said communication partner device. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A communication method comprising the steps of:
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upon receipt of known signals from a plurality of communication devices including a communication partner device, calculating an evaluation value indicative of a characteristic of a transmission path based on the known signals from said plurality of communication devices; based on said evaluation value, selecting between an adaptive array transmission scheme that utilizes both null steering and beamforming and an adaptive array transmission scheme that utilizes beamforming without null steering; and setting the selected adaptive array transmission scheme as a transmission scheme to the communication partner device.
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Specification