发明名称 |
Radio communication system and radio-frequency integrated circuit |
摘要 |
In a radio communication system having a plurality of antennas, a reception-system circuit including variable gain amplification circuits for amplifying a signal received from either of the antennas and a frequency conversion circuit for down-converting the received signal to a signal of a lower frequency, and a signal measuring circuit for detecting intensity of the received signal, whereby a signal received by either of the antennas is selected in accordance with a reception state and amplified and demodulated, change rates with time of a signal which is formed by the signal measuring circuit are determined in respect of either of the signals received by the plurality of antennas and a control signal for selecting a reception antenna is generated in accordance with a differences between the change rates.
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申请公布号 |
US2005159148(A1) |
申请公布日期 |
2005.07.21 |
申请号 |
US20050033384 |
申请日期 |
2005.01.12 |
申请人 |
HABUKA TOSHIHITO;INOKAWA NAOTO;MATSUURA TATSUJI;HORI TOYOKAZU;NOGAMI HIROSHI |
发明人 |
HABUKA TOSHIHITO;INOKAWA NAOTO;MATSUURA TATSUJI;HORI TOYOKAZU;NOGAMI HIROSHI |
分类号 |
H01Q21/29;H04B7/08;H04B7/26;H04L12/28;H04L12/56;H04M1/00;H04W24/00;H04W88/02;(IPC1-7):H04M1/00;H04Q7/20 |
主分类号 |
H01Q21/29 |
代理机构 |
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主权项 |
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地址 |
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