公开(公告)号：EP1243077A1

公开(公告)日：2002-09-25

申请号：EP00902521.4

申请日：2000-02-02

申请人： ISCO International, Inc.

发明人： JAGGER, Charles, E. ,  WILLETTS, Mark, N. ,  TOBIA, Micolino

IPC分类号： H04B1/12

CPC分类号： H04B1/71 ,  H04B1/1036

摘要： A method and device which dynamically detects, tracks and filters interfering signals with sufficient speed (i.e. within one IS-95 CDMA data frame period, or 20ms) and fidelity to eliminate or greatly reduce the deleterious effects of narrow band interferor signals on a CDMA link. When inserted in an RF signal path an Adaptive Notch Filter (ANF) detects narrow band interferors above a threshold level within the CDMA signal. Detection is accomplished by continuous scanning of a preset excision band, e.g. a specified narrow band associated with an AMPS system. Detected interferors are then automatically acquired and suppressed. This is achieved by electronically placing a rejection notch at the frequency of the interferors. Multiple notch filters may be used to simultaneously suppress multiple interferors. In the absence of interferors a bypass mode is selected allowing the RF signal to bypass the notch. Upon detection of an interferor, a switch is made to a suppression mode where the interferor is steered through a first notch section and suppressed. Alternatively, an external control line may be used to select the bypass mode so that the signal is allowed to pass the notch section, regardless of interferor content.

公开(公告)号：EP1269639B1

公开(公告)日：2007-05-30

申请号：EP01924805.3

申请日：2001-04-06

申请人： ISCO International, Inc.

发明人： JAGGER, Charles, E. ,  WILLETS, Mark, N. ,  TOBIA, Micolino

IPC分类号： H04B1/00

CPC分类号： H04W72/082 ,  H04B1/10 ,  H04B1/1036 ,  H04B1/71 ,  H04B1/7103 ,  H04B7/005 ,  H04B15/00 ,  H04B2001/1063 ,  H04B2201/709709 ,  H04B2201/709718 ,  H04W24/00 ,  H04W24/02 ,  H04W24/04 ,  H04W24/08 ,  H04W24/10 ,  H04W28/04 ,  H04W28/16 ,  H04W28/20 ,  H04W52/243 ,  H04W52/245 ,  H04W72/0453 ,  H04W72/085 ,  H04W88/02 ,  H04W88/08

摘要： An adaptive notch filter (ANF) module selectively filters a received wideband communication signal to eliminate narrowband interference that lies within the frequency spectrum of the wideband communication signal. To determine the presence of narrowband interference, the ANF module scans various known narrowband channels that lie within the frequency spectrum of the wideband communication signal and determines signal strengths for each of the narrowband channels. The signal strengths from the narrowband channels are compared to a threshold that is derived from the narrowband signal strengths. Narrowband channels having signal strengths that are greater than the threshold are determined to have interference.

公开(公告)号：EP1269639A2

公开(公告)日：2003-01-02

申请号：EP01924805.3

申请日：2001-04-06

申请人： ISCO International, Inc.

发明人： JAGGER, Charles, E. ,  WILLETS, Mark, N. ,  TOBIA, Micolino

IPC分类号： H04B1/00

CPC分类号： H04W72/082 ,  H04B1/10 ,  H04B1/1036 ,  H04B1/71 ,  H04B1/7103 ,  H04B7/005 ,  H04B15/00 ,  H04B2001/1063 ,  H04B2201/709709 ,  H04B2201/709718 ,  H04W24/00 ,  H04W24/02 ,  H04W24/04 ,  H04W24/08 ,  H04W24/10 ,  H04W28/04 ,  H04W28/16 ,  H04W28/20 ,  H04W52/243 ,  H04W52/245 ,  H04W72/0453 ,  H04W72/085 ,  H04W88/02 ,  H04W88/08

摘要： An adaptive notch filter (ANF) module selectively filters a received wideband communication signal to eliminate narrowband interference that lies within the frequency spectrum of the wideband communication signal. To determine the presence of narrowband interference, the ANF module scans various known narrowband channels that lie within the frequency spectrum of the wideband communication signal and determines signal strengths for each of the narrowband channels. The signal strengths from the narrowband channels are compared to a threshold that is derived from the narrowband signal strengths. Narrowband channels having signal strengths that are greater than the threshold are determined to have interference.