Radio terminal adevice, transmission directivity control method, and transmission directivity control program
AssigneeSanyo Electric Co., Ltd.
InventorYoshiharu Doi
Life of this patent
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Abstract
An adaptive array terminal (2000) includes a reception adaptive array unit (2030) extracting a reception signal from a base station by multiplying signals from respective antennas (#AN 1-#AN 2) of an array antenna by respective reception weights, a transmission adaptive array unit (2090) applying to respective antennas of the array antenna a plurality of signals generated by multiplying by a transmission signal by transmission weights to form transmission directivity, and a transmission weight calculator (2070) calculating transmission weights added with a specified constraint in accordance with designation in a reception signal.
Claims30
A radio terminal apparatus comprising:
- an array antenna including a plurality of antennas (#ANT 1, #ANT 2),
- a reception signal processing unit extracting a reception signal from a base station by multiplying signals from respective said antennas of said array antenna by respective reception weights,
- a transmission signal processing unit applying to respective said antennas of said array antenna a plurality of signals generated by multiplying a transmission signal by transmission weights to form transmission directivity, and
- transmission weight generation means for adaptively switching between a mode of calculating transmission weights forming transmission directivity towards said base station and a mode of calculating said transmission weights added with a specified constraint, in accordance with designation in said reception signal, to generate said transmission weights.
A transmission directivity control method of a radio terminal apparatus including an array antenna having a plurality of antennas (#ANT 1, #ANT 2) and for separating and extracting a reception signal from a base station by multiplying signals from respective said antennas of said array antenna by respective reception weights, said method comprising the steps of:
- adaptively switching between a mode of calculating transmission weights forming transmission directivity towards said base station and a mode of calculating said transmission weights added with a specified constraint, in accordance with designation in said reception signal, to generate said transmission weights, and
- providing to respective said antennas of said array antenna a plurality of signals generated by multiplying a transmission signal by said transmission weights to form said transmission directivity.
A transmission directivity control program of a radio terminal apparatus including an array antenna having a plurality of antennas (#ANT 1, #ANT 2) and for separating and extracting a reception signal from a base station by multiplying signals from respective said antennas of said array antenna by respective reception weights, said program causing a computer to execute the steps of:
- adaptively switching between a mode of calculating transmission weights forming transmission directivity towards said base station and a mode of calculating said transmission weights added with a specified constraint, in accordance with designation in said reception signal, to generate said transmission weights, and
- providing to respective said antennas of said array antenna a plurality of signals generated by multiplying a transmission signal by said transmission weights to form said transmission directivity.
Dependencies are inferred from the claim text.