发明名称 |
Carrier detecting circuit for detecting the level of a received signal and communication apparatus |
摘要 |
An RSSI block cumulating circuit block-cumulates an RSSI signal that has been A/D converted and calculates an RSSI signal in a low level. An RSSI level raising circuit raises the level of the RSSI signal and outputs the resultant signal as a threshold value. An RSSI continuous cumulating circuit always cumulates the RSSI signal. A comparing circuit compares the threshold value with the output signal of the RSSI continuous cumulating circuit and determines whether or not a carrier is present.
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申请公布号 |
US6671331(B1) |
申请公布日期 |
2003.12.30 |
申请号 |
US19990441333 |
申请日期 |
1999.11.16 |
申请人 |
NEC CORPORATION |
发明人 |
SAKUMA SHIGERU |
分类号 |
H04J3/00;H03K9/00;H04B1/10;H04B1/16;H04B17/00;H04K1/00;H04L;H04Q7/22;(IPC1-7):H03K9/00 |
主分类号 |
H04J3/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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