Radio communication apparatus and transmission antenna changing method
First Claim
1. A radio communication apparatus comprising:
- a received signal strength detector configured to detect received signal strength of signals received by a plurality of antennas at the same time for each communication destination and for each antenna;
a transmission antenna selector configured to select antennas different from each other with respect to the respective communication destinations as transmission antennas based on said detected received signal strength; and
a transmission antenna changer configured to change said transmission antenna in accordance with a selection result by said transmission antenna selector.
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Accused Products
Abstract
Received signal strength detecting means 109 and 110 detect received signal strength of the antennas of the respective terminals. A transmission antenna selector 111 selects an antenna with a maximum received signal strength with respect to the respective communication destinations, and when there is a plurality of communication destinations having the same antenna with a maximum received signal strength, the transmission antenna selector selects transmission antennas to be different from each other based on the received signal strength of the antennas with the second largest received signal strength, and an internal switch of a transmission antenna change device 114 is changed based on the selection result. This eliminates the need for providing mixers without reducing transmission diversity effect, and results in a reduction of a maximum output of a transmission amplifier.
60 Citations
17 Claims
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1. A radio communication apparatus comprising:
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a received signal strength detector configured to detect received signal strength of signals received by a plurality of antennas at the same time for each communication destination and for each antenna;
a transmission antenna selector configured to select antennas different from each other with respect to the respective communication destinations as transmission antennas based on said detected received signal strength; and
a transmission antenna changer configured to change said transmission antenna in accordance with a selection result by said transmission antenna selector. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A communication terminal apparatus having a radio communication apparatus, said radio communication apparatus comprising:
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a received signal strength detector configured to detect received signal strength of signals received by a plurality of antennas at the same time for each communication destination and for each antenna;
a transmission antenna selector configured to select antennas different from each other with respect to the respective communication destinations as transmission antennas based on said detected received signal strength; and
a transmission antenna changer configured to change said transmission antenna in accordance with a selection result by said transmission antenna selector.
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9. A base station apparatus having a radio communication apparatus, said radio communication apparatus comprising:
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a received signal strength detector configured to detect received signal strength of signals received by a plurality of antennas at the same time for each communication destination and for each antenna;
a transmission antenna selector configured to select antennas different from each other with respect to the respective communication destinations as transmission antennas based on said detected received signal strength; and
a transmission antenna changer configured to change said transmission antenna in accordance with a selection result by said transmission antenna selector.
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10. A transmission antenna changing method comprising the steps of:
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detecting received signal strength of signals received by a plurality of antennas at the same time for each communication destination and for each antenna;
selecting antennas different from each other with respect to the respective communication destinations as transmission antennas based on said detected received signal strength; and
changing said transmission antenna in accordance with a selection result by said transmission antenna selecting means. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A radio communication apparatus comprising:
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a received signal strength detector configured to detect received signal strength of signals received by a plurality of antennas at the same time for each communication destination and for each antenna;
a transmission antenna selector configured to select transmission antennas to transmit signals to the respective communication destinations based on the detected received signal strength; and
a transmission antenna changer configured to change said transmission antenna in accordance with a selection result by said transmission antenna selector.
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Specification