Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for analyzing a wide frequency band with respect to signal power levels in specified narrow frequency bands, detecting narrow band signal power levels received in the specified narrow frequency bands, determining an average composite wideband power level from the narrow band signal power levels, determining an adaptive threshold, scanning a known narrow band channel of the wide frequency band having a history of causing interference in the wide frequency band, and detecting according to one of the adaptive threshold, the average composite wideband power level, or both, interference in the wide frequency band caused by signals transmitted in the known narrow band channel. Other embodiments are disclosed.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for determining a wideband power level by scanning a wide frequency band, determining a threshold, detecting from signals scanned in the wide frequency band interference associated with a plurality of channels, wherein the interference is detected according to one of the threshold, the wideband power level, or both, and modifying a variable bandwidth of a filter to substantially suppress the detected interference. Other embodiments are disclosed.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for measuring power levels of signals provided by a receiver configured to scan radio frequency signals over a wide frequency band, calculating an average power level from at least a portion of the measured power levels, determining a threshold, detecting interference in the wide frequency band based on the threshold, the average power level, or both, and causing a null that substantially suppresses the interference received by the receiver. Other embodiments are disclosed.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for scanning wireless signals in a wide frequency band, measuring power levels in narrow frequency bands from the wireless signals, determining a threshold according to an average wideband power level or at least a portion of the power levels in the narrow frequency bands, detecting from the wireless signals a narrow band interferer based on the threshold, and initiating a strategy for responding to interference in the wide frequency band caused by the detected narrow band interferer. Other embodiments are disclosed.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for receiving a mitigation strategy for reducing interference caused by at least one narrow band interferer detected in a wide frequency band according to an average wideband power level, an adaptive threshold, or both, creating a message according to the mitigation strategy to transmit to at least one communication device transmitting wireless signals that are associated with the at least one narrow band interferer, and transmitting the mitigation message to the at least one communication device to cause the at least one communication device to adjust operations of a wireless transmitter of the at least one communication device. Other embodiments are disclosed.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for analyzing a wide frequency band with respect to signal power levels in specified narrow frequency bands, detecting narrow band signal power levels received in the specified narrow frequency bands, determining an average composite wideband power level from the narrow band signal power levels, determining an adaptive threshold, detecting narrow band interference according to one of the average composite wideband power level, the adaptive threshold, or both, prioritizing the detected narrow band interference, and selectively filtering a portion of the detected narrow band interference according to the prioritization. Other embodiments are disclosed.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for analyzing a wide frequency band with respect to signal power levels in specified narrow frequency bands, detecting narrow band signal power levels received in the specified narrow frequency bands, determining an average composite wideband power level from the narrow band signal power levels, determining an adaptive threshold, detecting narrow band interference according to the adaptive threshold, and configuring a variable bandwidth of a filter to substantially suppress the detected narrow band interference. Other embodiments are disclosed.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for analyzing a wide frequency band with respect to signal power levels in specified narrow frequency bands, detecting narrow band signal power levels received in the specified narrow frequency bands, determining an average composite wideband power level from the narrow band signal power levels, and determining an adaptive threshold from the narrow band signal power levels for detecting narrow band interferers in the wide frequency band. Other embodiments are disclosed.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for analyzing a wide frequency band with respect to signal power levels in specified narrow frequency bands, detecting narrow band signal power levels received in the specified narrow frequency bands, determining an average composite wideband power level from the narrow band signal power levels, determining an adaptive threshold, tracking narrow band interferers according to the adaptive threshold and the average composite wideband power level, and transmitting a report descriptive of the narrow band interferers. Other embodiments are disclosed.

Abstract: A system that incorporates teachings of the subject disclosure may include, for example, a method for analyzing a wide frequency band with respect to signal power levels in specified narrow frequency bands, detecting narrow band signal power levels received in the specified narrow frequency bands, determining an average composite wideband power level from the narrow band signal power levels, determining an adaptive threshold from the average composite wideband power level, detecting narrow band interference according to the adaptive threshold, and configuring a filter to substantially suppress the detected narrow band interference. Other embodiments are disclosed.

Abstract: 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.

Abstract: 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.

Abstract: The present invention provides a serrodyne architecture that is capable of operating at high frequencies. The architecture generally includes a coupler, a delay line, and a switching system. The delay line is coupled to a reflective port of the coupler. The switching system is coupled to the delay line at different points and is configured to selectively shunt those points on the delay line to change the effective electrical length of the delay line. The effective electrical length is changed throughout the period, corresponding to the amount the frequency of the input signal is shifted. In operation, an input signal is provided to an input port of the coupler, and an output signal is provided at the output port, wherein the input signal and the output signal vary by a translation frequency, which is controlled based on how the effective electrical length of the delay line is changed.

Abstract: The present invention provides a technique for canceling spurious noise content in transmitted signals. During transmission, the transmitted signals are fed back to circuitry adapted to provide a predistortion component for signals to be transmitted, as well as to compensate for spurious noise injected into the system. In a first path, the circuitry will predistort the baseband signals to provide a predistorted output. Along a second path, a fast Fourier transform is performed on the feedback signal. The resultant frequency domain signal is then processed to detect spurious noise content above an identified defined threshold. The spurious noise content is used to recreate a replica of the noise content. The replica will have the same phase and frequency and a magnitude sufficient to reduce or eliminate the content to a desired degree. The replicated signal is then negatively added to the predistorted signals to create a final signal for transmission.

Abstract: 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 20 ms) and fidelity to eliminate or greatly reduce the deleterious effects of narrow band interferer 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.

Abstract: A low noise amplifier (LNA) in a LNA arrangement is selectively bypassed, without detracting from the performance of the LNA arrangement when it is not bypassed, by selecting components of an input signal which are reflected at the input of the LNA. These reflected signal components can be increased, when the LNA is bypassed, by interrupting a supply voltage to the LNA and/or shunting the input of the LNA to ground. The arrangement can be a balanced LNA arrangement, using two LNAs and two quadrature couplers, or it can be an unbalanced LNA arrangement.

Abstract: 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.

Abstract: 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.

Abstract: 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.