发明名称 |
Reducing narrowband interference in a wideband signal |
摘要 |
Narrowband interference in a wideband RF signal is reduced by a notch filter operating at IF between down- and up-converters supplied by a local oscillator (LO) at a frequency controlled by a control circuit. The control circuit detects interference by determining power in each of a plurality of narrowband channels, also at IF via another down-converter with a controlled LO frequency, relative to power of the wideband RF signal and scaled in accordance with the wideband and narrowband bandwidths. The control circuit controls the LOs for scanning the narrowband channels to determine a channel with greatest interference and to filter out this narrowband channel with the notch filter. In the absence of interference, the notch is tuned outside the signal bandwidth.
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申请公布号 |
US2004062216(A1) |
申请公布日期 |
2004.04.01 |
申请号 |
US20020259891 |
申请日期 |
2002.09.30 |
申请人 |
NICHOLLS CHARLES T.;CARLETON GREGORY C.;BERGSMA ADRIAN J. |
发明人 |
NICHOLLS CHARLES T.;CARLETON GREGORY C.;BERGSMA ADRIAN J. |
分类号 |
H04B1/707;(IPC1-7):H04B7/216 |
主分类号 |
H04B1/707 |
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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