Entries |
Document | Title | Date |
20080207154 | INTEGRATED CIRCUIT AND METHOD FOR RECEPTION OF RADIO FREQUENCY SIGNALS - An integrated circuit, IC, for reception of radio frequency; RF, signals in an antenna network system, the IC comprising: | 08-28-2008 |
20080214135 | Methods and apparatus to perform noise cancellation in radios - Methods and apparatus to perform noise cancellation in radios are described. According to one example, a receiver includes a front end amplifier to receive and amplify an input signal; a downconverter to downconvert the amplified input signal; a feedback estimator to estimate a noise in the downconverted signal; and a feedback implementer to produce a feedback signal based on the estimated noise and to couple the feedback signal to the front end amplifier. | 09-04-2008 |
20080220736 | METHOD AND APPARATUS FOR SPREADING SIGNAL ACQUISITION AND TRACKING - A spreading signal acquisition and tracking method and apparatus is proposed. In accordance with the present invention, coherent integrations are performed by segments and stored for a non-coherent integration. A better freedom of the non-coherent interval selection is provided. The window of the non-coherent integration is sequentially and gradually shifted to achieve better update rate to its detection circuit and to improve searching and tracking for a spreading signal. By using the present invention, rapid signal acquisition can be achieved even when intensity of the spreading signal is very weak, or even when deeper signal blocking or jamming occurs. | 09-11-2008 |
20080248774 | APPARATUS AND METHOD OF REMOVING INTERFERENCE NOISE IN PERSONAL COMMUNICATION TERMINAL - Apparatus and method for removing interference noise in a personal communication terminal. A function of removing interference noise is adapted to the personal communication terminal, and adjustment parameters for removing interference noises are continuously set to up-to-date adjustment parameters, so that, in the activation of broadcast receiving, a turn-on stabilizing time of the personal communication terminal can be reduced, and the broadcast receiving performance can be maintained at an optimum state. | 10-09-2008 |
20080274711 | SUCCESSIVE INTERFERENCE CANCELLATION IN CODE DIVISION MULTIPLE ACCESS SYSTEM USING VARIABLE INTERFERER WEIGHTS - A method for successive interference cancellation in code division multiple access (CDMA) systems is provided that uses variable interferer weights. This method allows interfering signals to be cancelled in order to recover a transmitted data signal. This method involves receiving the data signal subject to interference from at least one interfering signal. A first interfering signal is identified. Then an interferer weight coefficient associated with the first interfering signal is generated. This allows the first interfering signal to be cancelled from the received data signal using the interferer weight coefficient. These processes may then be reiterated for other interfering signals. It is then possible to recover the transmitted data signal from the received data signal. | 11-06-2008 |
20080280581 | RF receiver with adjustable antenna assembly - A radio frequency (RF) receiver includes an antenna assembly, a low noise amplifier module, a down conversion module, and a baseband processing module. The antenna assembly is coupled to receive an inbound RF signal that includes a first signal component and a second signal component. The antenna assembly adjusts amplitude and/or phase of the first and/or second signal components to produce an adjusted inbound RF signal based on an adjust signal. The low noise amplifier module amplifies the adjusted inbound RF signal to produce an amplified inbound RF signal. The down conversion module converts the amplified inbound RF signal into a first inbound symbol stream corresponding to the first signal component and into a second inbound symbol stream corresponding to the second signal component. The baseband processing module converts the first and second inbound symbol streams into inbound data and to generate the adjust signal. | 11-13-2008 |
20080299932 | Arrangements for narrow band interference detection - A method is disclosed for mitigating narrowband interference within a system for wideband communications. The method can include separating a wideband signal into a plurality of sub bands, detecting energy levels in the sub-bands, and activating a control signal if the energy levels of the sub-bands differ by a predetermined amount. Such a difference in energy levels can indicate that narrowband interference is present and interference mitigation features can be activated. In another embodiment, a system is disclosed that has a band splitter and a plurality of energy level detectors to detect energy differences in the sub bands. Other embodiments are also disclosed. | 12-04-2008 |
20090004989 | Systems and methods for cross-platform radio frequency interference mitigation - Embodiments include systems and methods for RFI mitigation in a wireless computing environment. In one embodiment, a platform determines RFI information of the platform by listening with a receiver of a transceiver of the platform when the transmitter of the transceiver is quiescent. The platform derives Frequency Domain Weights from the RFI information and transmits the Frequency Domain Weights to a Wireless Access Point (WAP). In the transmitter and receiver of the WAP, the Frequency Domain Weights are applied to signals received and to be transmitted. | 01-01-2009 |
20090004990 | AUTOMATIC GAIN CONTROL LOCKED ON TO THE RECEIVED POWER PROBABILITY DENSITY - The invention relates to a radio receiver, notably for applications of satellite positioning, that must operate in an environment in which the interference is dense, notably when it involves pulses transmitted by DME beacons. The effective processing of the interference assumes having an unbiased noise reference. According to the invention, the latter is generated by a signal power probability function analysis in its portion essentially comprising low-power signals. | 01-01-2009 |
20090017783 | METHODS AND APPARATUS FOR ACTIVE SUCCESSIVE INTERFERENCE CANCELLATION BASED ON ONE RATE FEEDBACK AND PROBABILITY ADAPTATION IN PEER-TO-PEER NETWORKS - A first receiver device receives a first pilot signal from a first transmitter device and a second pilot signal from a second transmitter device. The second pilot signal indicates that the second transmitter device intends to transmit a second traffic signal. The first receiver device determines a transmission rate for the first transmitter device as a function of the received signal strength of the first pilot and a predicted amount of the total interference to be perceived by the first receiver device. The predicted amount of the total interference being determined as a function of a SIC success probability. The transmission rate is sent to the first transmitter device. The first receiver device predicts whether the second traffic signal can be decoded and subtracted before the first receiver device decodes the first traffic signal to be transmitted by the first transmitter device as a function of the SIC success probability. | 01-15-2009 |
20090017784 | Method and Device for Low Delay Processing - Adaptively processing an input signal, such as an input signal of a hearing aid. The input signal is passed through an adaptive time domain filter to produce an output signal. At least one of the input signal and the output signal is used as an analysis signal. The analysis signal is transformed into a transform domain to produce a transformed analysis signal, which is analysed to produce a desired gain for each respective transform domain sub-band. A minimum phase time domain filter characteristic is synthesised which approaches the desired gains. The adaptive filter is updated with the synthesised filter characteristic. | 01-15-2009 |
20090036082 | CANCELING SELF-JAMMER AND INTERFERING SIGNALS IN AN RFID SYSTEM - Briefly, in accordance with one or more embodiments, a method and device capable of canceling self-jammer and one or more other interfering signals in an radio frequency identification system or the like is disclosed. | 02-05-2009 |
20090036083 | Communication unit and method for interference mitigation - A communication unit comprises a receiver for receiving a composite communication signal that comprises a desired signal and at least one asynchronously received interfering signal. The receiver comprises detector logic arranged to detect and process the composite communication signal as if the at least one asynchronously received interfering signal were synchronously received with the desired signal. | 02-05-2009 |
20090036084 | METHOD FOR DETECTING THE EVETUAL PRESENCE OF AN INTERFERER, FOR EXAMPLE A RADAR SIGNAL, ADAPTED TO INTERFERE WITH A WIRELESS DEVICE, FOR EXAMPLE A UWB DEVICE, AND CORRESPONDING DEVICE - The method is for detecting the eventual presence of an interferer that is adapted to interfere with a wireless device. The wireless device is provided with at least one receiving chain including an analog to digital conversion stage. The method includes receiving on the receiving chain an incident signal, and delivering to the ADC stage an analog signal from the incident signal. The method further includes elaborating or determining a binary information from a binary signal delivered by the ADC stage and representative of the level of the analog signal, analyzing a temporal evolution of the binary information and detecting the presence of the interferer from the analysis. | 02-05-2009 |
20090036085 | FM tuner - An FM tuner that has a multipath reception detection unit and an adjacent-channel interference detection unit while reducing expansion of the scale of the circuit is available. A control signal for a stereo separation level is generated on the basis of a signal S | 02-05-2009 |
20090061805 | RF RECEIVER AND METHOD FOR REMOVING INTERFERENCE SIGNAL - An RF receiver and a method by which the RF receiver removes interference signals are provided. The RF receiver includes a first signal processor which detects an undesired signal from RF signals received through a channel, to convert the phase of the detected signal; and a second signal processor which combines the signal output from the first signal processor with the received RF signals, to detect a desired signal. Therefore, it is possible to remove undesired signals existing on channels in which there is no overlap in frequency between desired signals and undesired signals, and accordingly an RF receiver having enhanced performance and a method by which the RF receiver removes interference signals may be provided. | 03-05-2009 |
20090061806 | BAND SWITCH CONTROL APPARATUS FOR INTERMEDIATE FREQUENCY FILTER - A band-switch control apparatus for an intermediate-frequency filter comprising: an adjacent interference-signal detecting unit for detecting an adjacent interference-signal, having a frequency adjacent to the desired frequency, superimposed on a reception signal having a frequency tuned to a desired frequency; a modulation-degree detecting unit for detecting a modulation degree of the reception signal; a bandwidth selecting unit for selecting a pass bandwidth of the intermediate-frequency filter corresponding to the amplitude of the adjacent interference-signal; and a band-narrowing suppression control unit for selecting a lower limit value of the pass bandwidth of the intermediate-frequency filter corresponding to the demodulation degree, the intermediate-frequency filter for passing, with a variable pass bandwidth, an intermediate-frequency signal obtained by frequency converting the reception signal, and changing the pass bandwidth selected by the bandwidth selecting unit to the lower limit value, if the pass bandwidth selected by the bandwidth selecting unit is smaller than the value. | 03-05-2009 |
20090068973 | NOISE SUPPRESSION APPARATUS - A noise suppression apparatus comprising: a complex signal generation unit configured to convert an intermediate frequency signal into a complex signal having a real part and an imaginary part, the intermediate frequency signal being obtained by frequency-converting a reception signal; a noise detection unit configured to detect whether or not variation in level of the complex signal is greater than a predetermined threshold value, to detect generation of noise; and a noise suppressing unit configured to suppress level of the complex signal if the variation in level is greater than the predetermined threshold value. | 03-12-2009 |
20090088115 | Novel Distributed Direct Conversion Receiver (DDCR) for UWB Systems - A novel DDCR RF front-end for use in UWB applications combining a distributed approach which provides wideband functionality of the RF front-end with I-Q requirement of DCRs. The distributed architecture uses composite cells of a merged LNA and mixer along the input RF T-line. | 04-02-2009 |
20090088116 | METHOD AND APPARATUS OF SUCCESSIVE INTERFERENCE CANCELLATION FOR WIRELESS COMMUNICATION SYSTEM - A method and apparatus of successive interference cancellation for a wireless communication system is provided. A method of detecting a transmission signal for the method of the successive interference cancellation, the method including: receiving transmission signals transmitted from ‘M’ antennas; calculating a residual error value of each of the received transmission signals; and determining a detection sequence of the transmission signals based on the calculated residual error value. | 04-02-2009 |
20090104885 | MIXING DEVICE AND RADIO-FREQUENCY RECEIVER USING THE SAME - A mixing device includes a mixing circuit and a ring oscillation circuit. The mixing circuit includes “M” mixers connected to the input terminal of the mixing device at one input. The ring oscillation circuit includes (2×M) inverters connected in series in a ring shape. The other input of the K-th mixer where “K” is a natural number of 1 to “M” balance-inputs an oscillation signal which is phase-shifted by (−Kπ/M) radian and outputted from the K-th inverter and an oscillation signal which is phase-shifted by (−(M+K)π/M) radian and outputted from the (M+K)th inverter. Between the output of the K-th mixer and the output terminal is provided a phase shifter having a phase shift amount of (−2π+Kπ/M) radian. | 04-23-2009 |
20090111417 | ADAPTIVE MIXING FOR HIGH SLEW RATES - A method and apparatus for demodulation of detected fringes from interferometric sensors with high slew rates are provided. A detected interference signal may be mixed with a local oscillator phasor to obtain a mixed signal, the local oscillator being controlled to produce a frequency that roughly matches the fringe frequency of the interference signal. A sensor phase estimate may be obtained from the detected interference signal or the mixed signal. The local oscillator signal can be computed from the sensor phase estimate. The mixed signal and the sensor phase estimate may be low pass filtered and decimated and the resulting decimated mixed signal and decimated sensor phase estimate may be processed and combined with moderate processing power requirements in an effort to accurately measure the sensor phase for the interferometric sensor. | 04-30-2009 |
20090124228 | INTERMODULATION DISTURBANCE DETECTING UNIT - There are provided a notch filter | 05-14-2009 |
20090137221 | INTERFERENCE MANAGEMENT IN A WIRELESS COMMUNICATION SYSTEM USING BEAM AND NULL STEERING - Interference that occurs during wireless communication may be managed through the use of beam and null steering techniques. A method, apparatus and medium of communication determine an interference direction of a non-associated access terminal generating an interfering signal. Transmitted and received signals are then transceived away from the interference direction. | 05-28-2009 |
20090143041 | Diversity Receiver System with Interference Cancellation and Methods for Use Therewith - A diversity receiver includes a first radio frequency (RF) receiver section receives a first inbound RF signal over a range of frequencies and generates a first amplified RF signal, wherein the first inbound RF signal includes a desired RF signal component and an undesired signal component. A second RF receiver section receives a second inbound RF signal over the range of frequencies and generates a second amplified RF signal, wherein the second inbound RF signal includes the desired signal component and the undesired signal component. A first RF cancellation module generates a desired RF signal from the desired RF signal component while attenuating the undesired signal component, based on the first amplified RF signal and the second amplified RF signal. | 06-04-2009 |
20090143042 | CROSS POLARIZATION INTERFERENCE CANCELING METHOD AND CROSS POLARIZATION INTERFERENCE CANCELING APPARATUS - A cross polarization interference canceling apparatus of the present invention includes: error detector | 06-04-2009 |
20090149147 | Speed-Based, Hybrid Parametric/Non-parametric Equalization - A mobile receiver having a multi-mode interference suppression function and a way to estimate its speed utilizes a parametric approach to interference suppression at high speeds, and a nonparametric approach at low speeds. In particular, if the mobile receiver is currently operating in a nonparametric mode and its speed exceeds a first predetermined threshold, the mobile receiver switches to a parametric mode. Conversely, if the mobile receiver is currently in parametric mode and its speed is less than a second predetermined threshold, the mobile receiver switches to nonparametric mode. In one embodiment, the speed may be estimated by a Doppler frequency in the received signal, and the thresholds are Doppler frequencies. In one embodiment, the first and second thresholds are different, creating a hysteresis in the mode switching. | 06-11-2009 |
20090156152 | TRACKING FILTER FOR A RECEIVER - A tracking filter for attenuating out-of-band signals and adjacent channel signals in a receiver is described. In one exemplary design, an apparatus includes a tracking filter, an LNA, and a downconverter. The tracking filter includes a summer, a filter, and an upconverter. The summer subtracts a feedback signal from an input signal and provides a first signal. The LNA amplifies the first signal and provides a second signal. The downconverter frequency downconverts the second signal and provides an output signal. The filter filters (e.g., differentiates) the output signal and provides a third signal. The filter blocks a desired signal and passes out-of-band signal components. The upconverter frequency upconverts the third signal and provides a fourth signal from which the feedback signal is derived. The tracking filter has an equivalent bandpass filter response and a variable center frequency determined based on the frequency of the desired signal. | 06-18-2009 |
20090156153 | ADAPTIVE COHERENT RFID READER CARRIER CANCELLATION - Systems and methods for adaptive cancellation of carrier content includes receiving a signal, adaptively detecting an amount of carrier content in the received signal, generating a feedback signal for canceling out the carrier content in the incoming signal, and introducing the feedback signal for canceling out a majority of carrier content in the signal being received | 06-18-2009 |
20090163167 | AUTOMATIC GAIN CONTROL FOR BEAMFORMED SIGNALS - A method of selecting an RF gain of an automatic gain control amplifier includes the steps of measuring a strength of a received signal, the signal reliable and consistent power characteristics, and then measuring an interference level of the received signal, and determining either a target output power level or a target output interference power level based on a ratio of the measured signal strength to the measured interference level. The method also includes determining a gain that, when applied to an incoming signal, will produce a corresponding one of the determined target output power level and the determined target output interference power level. | 06-25-2009 |
20090170462 | Method for Attenuating a High Frequency Emission From a Clocked System - The method provides the following steps: determining a temporally averaged maximum value, which the power of the high frequency emission of the clocked system must not exceed in a predefined frequency band; modulating an oscillating frequency provided by the oscillator as the excitation source with a frequency deviation so that the average power is below the maximum value in the predefined frequency band; determining a bandwidth of a wireless receiver; and modulating the oscillation frequency with a modulation frequency that is greater than the bandwidth of the wireless receiver. | 07-02-2009 |
20090181632 | Communication apparatus, noise canceller, noise canceling method, and noise canceling program - A communication apparatus includes an I and Q digital values table that stores values of I and Q, which are parameters for noise cancellation determined in advance, for each of reception channels. The communication apparatus reads out parameters for noise cancellation corresponding to a reception channel from the I and Q digital values table. Subsequently, the communication apparatus cancels a noise signal from a reception signal using the read-out parameters for noise cancellation. | 07-16-2009 |
20090191833 | HIGH PERFORMANCE CMOS RADIO FREQUENCY RECEIVER - A high performance radio frequency receiver includes a low noise amplifier with large binary and stepped gain control range, controlled impedance, and enhanced blocker immunity, for amplifying and converting a radio frequency signal to a current; a pulse generator for generating in-phase and quadrature pulses; a crossover correction circuit and pulse shaper for controlling a crossover threshold of the pulses and interaction between in-phase and quadrature mixers; and a double balanced mixer for combining the RF signal with the pulses to generate an intermediate frequency or baseband zero intermediate frequency current-mode signal. The in-phase and quadrature pulses have a duty cycle of 20-35%. The intermediate frequency signal and second order harmonics may be filtered with a high frequency low pass filter and a current injected complex direct-coupled filter. Decreased die size, current drain, cost, and complexity, as well as improvements in gain, 1/f noise, noise figure, sensitivity, and linearity may result. | 07-30-2009 |
20090197558 | Communicating apparatus, noise canceling method and memory product - A phase and amplitude controller reads from a switching control table an antenna switching number and values of I and Q corresponding to a receiving channel number reported from a W-CDMA receiver module, and outputs the antenna switching number and the values of I and Q to a switch and DACs, respectively. After a phase and amplitude adjustment IC adjusts the phase and amplitude of a noise signal obtained through the switch by using the values of I and Q inputted through the DACs, it inverts the phase of the noise signal and adds the resulting signal to a reception signal received by a communication antenna, and consequently the noise component is canceled from the reception signal. | 08-06-2009 |
20090197559 | Magnetically Differential Input - A magnetically differential input circuit is arranged to define at least two loops, wherein each of the loops traverses the input of a receiving circuit. The loops are physically arranged so that a source of interference induces opposing signals in the loops, thereby effecting cancellation of the interference at the input of the receiving circuit. In one embodiment, the input circuit is arranged to be electrically differential as well as magnetically differential. | 08-06-2009 |
20090215420 | Adaptive Noise Figure Control in a Radio Receiver - Systems and methods are provided for adjusting a noise figure in a radio receiver. An example method includes receiving a radio frequency (RF) signal at a RF receiver section. The RF receiver section includes at least one RF receiver element. The RF receiver element is controllable by at least one tuning variable. The RF signal is processed to generate a processed analog signal, which is converted to a digital signal. The digital signal is used to determine a performance parameter. The at least one tuning variable of the at least one RF receiver element is controlled to adjust the noise figure based on the performance parameter. In another aspect of the invention, an example radio receiver is provided. The radio receiver includes a RF receiver section having at least one RF receiver element. A controller determines a performance parameter using the digital signal and controls the at least one tuning variable to adjust the noise figure based on the performance parameter. | 08-27-2009 |
20090221254 | RECEPTION APPARATUS, RECEPTION METHOD AND PROGRAM - A reception apparatus including an extraction section; a transmission line characteristic estimation section; an interpolation section; a compensation section; a detection section; and a selection section. | 09-03-2009 |
20090233568 | HIGH-LINEARITY RECEIVER WITH TRANSMIT LEAKAGE CANCELLATION - Techniques for performing transmit (TX) leakage cancellation are described. A receiver includes a low noise amplifier (LNA) and a TX leakage canceller. The LNA amplifies a receiver input signal and provides an amplified signal. The TX leakage canceller includes a downconverter, a notch filter, and an upconverter. The downconverter downconverts a canceller input signal (e.g., obtained from the LNA output) with a first LO signal at a transmit frequency and provides a downconverted signal. The notch filter filters the downconverted signal to pass an undesired signal (e.g., a TX leakage signal) and attenuate a jammer and a desired signal in the canceller input signal. The upconverter upconverts the filtered signal with a second LO signal at the transmit frequency and provides a feedback signal. The feedback signal is subtracted at the input or output of the LNA to cancel the undesired signal. | 09-17-2009 |
20090233569 | SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE PROVIDED WITH FM RECEIVING FUNCTION - A semiconductor integrated circuit device includes a clock generation unit, a signal processing unit, an FM receiving unit, a processor, and a bus. The signal processing unit, FM receiving unit, and processor operate in synchronization with the clock generated by the clock generation unit. The FM receiving unit includes an RF unit, a canceller and a wave detector. The RF unit performs frequency conversion of the received FM signal using the clock as a base signal. The canceller produces a replica of a noise using a signal as a reference signal to cancel the noise on the FM signal. The signal is obtained by performing frequency conversion of a signal in at least one of the signal processing unit and the bus using the clock as a base signal. The wave detector detects the FM signal in which the noise is cancelled. | 09-17-2009 |
20090264091 | METHOD AND SYSTEM FOR CLOSED LOOP POWER CONTROL IN WIRELESS SYSTEMS - Aspects of a method and system for closed loop power control in wireless systems are provided. In this regard, an output power of an amplifier may be measured and an indication of the measured power may be compared to a reference signal. The results of the comparison are utilized to generate an error correction factor. The gain of a preamplifier may be adjusted utilizing the error correction factor, where the output of the preamplifier may be input to the amplifier. The error correction factor may be generated via a proportional integral derivative controller. The gain of the preamplifier may be adjusted via at least one control signal, where the at least one control signal may be generated based on a reference control word and the error correction factor. The indication of the measured power and the reference signal may be time aligned. | 10-22-2009 |
20090280766 | Method And System For On-Demand Signal Notching In A Receiver - Aspects of a method and system for on-demand signal notching in a receiver. In this regard, signal strength measurements of a received signal may enable detection of unwanted signal component(s) and one or more filters in an on-chip receiver may be configured in response to the measurements. The filter(s) may additionally be configured based on power consumption of the filter(s). Signal measurements and/or the corresponding configuration may be performed real-time. The filter(s) may be configured such that a notch in a frequency response of the filter(s) is centered at or near the unwanted component. In this manner, the unwanted component(s) may be filtered out. The filter(s) may be configured, for example, by switching one or more filter stages and/or components into and/or out of a signal path and/or by tuning one or more variable circuit elements within the filter(s). | 11-12-2009 |
20090291660 | MULTI-BAND RECEIVER WITH HARMONIC CANCELLATION AND METHODS FOR USE THEREWITH - A multi-band receiver includes a first receiver coupled to receive a first desired signal component of an RF signal over a first range of frequencies and generate a first received signal. A second receiver receives a second desired signal component of the RF signal over a second range of frequencies and generates a second received signal. The second receiver includes a harmonic cancellation module that attenuates a harmonic of the first desired signal component that falls within the second range of frequencies. | 11-26-2009 |
20090298455 | LOW NOISE RECEIVING APPARATUS - A low noise receiving apparatus includes an amplifier which inputs an input signal, an output matching circuit which is connected between the amplifier and an output terminal which matches an impedance of an output side of the amplifier, a bypass circuit which bypasses the amplifier and is connected to an output side of the output matching circuit, and a switching circuit having one end connected between the amplifier and the output matching circuit and the other end connected to an alternating current ground which switches whether or not to connect an output of the amplifier to the alternating current ground. In a bypass mode, the switching circuit connects the output of the amplifier to the alternating current ground in order to have a lower impedance viewed from the output terminal of the output matching circuit than in an amplification mode. | 12-03-2009 |
20090318104 | ANALOG RADIO RECEIVER - An analog radio receiver change a noise suppression parameter appropriate for a sound to be reproduced. The analog radio receiver includes a sound category determining unit for determining a category of a sound to be reproduced from an input signal, and a selecting unit for selecting, on the basis of the category determined by the sound category determining unit, a noise suppression parameter such as passband of the IF filter, blend value of the stereo blend unit, high-cut value of the high-cut unit, response rate of the soft mute unit, and the like, wherein the IF filter, the stereo blend unit, the high-cut unit, the soft mute unit suppress noises of the input signal on the basis of the noise suppression parameter selected by the selecting unit. | 12-24-2009 |
20090325529 | CALIBRATING RECEIVE CHAIN TO REDUCE SECOND ORDER INTERMODULATION DISTORTION - Embodiments of apparatuses, articles, methods, and systems for calibrating receive chain to reduce second order intermodulation distortion are disclosed herein. The embodiments may be employed, e.g., to manage power in wireless networks. Other embodiments and usages may be described and claimed. | 12-31-2009 |
20090325530 | Dynamic RFI detection - Provided herein are different embodiments for performing radio frequency interference (RFI) detection in electronic devices such as mobile computing systems. | 12-31-2009 |
20100029237 | Radio receiving apparatus and radio receiving method - A radio receiving apparatus includes a detection unit and a directivity changing unit. The detection unit detects an occurrence of intermodulation interference to a desired signal demodulated based on received signals received by a plurality of antenna elements. The directivity changing unit changes a reception directivity pattern of the plurality of antenna elements to another pattern having a null direction different from a null direction obtained before the directivity pattern is changed, in accordance with detection of the occurrence of the intermodulation interference by the detection unit. | 02-04-2010 |
20100048156 | NOISE CANCELLATION FOR ANTENNA MODULE - An antenna module with a detector and an associated canceller is disclosed. The detector may also detect interference and spurs. In one embodiment, an antenna module can include: an antenna configured to receive an electromagnetic signal in a signal path; an amplifier configured to amplify the received electromagnetic signal, and to provide the amplified signal at a first node; a filter configured to receive the amplified signal from the first node, and to provide a filtered signal output therefrom; and a noise canceller and a detector integrated in the signal path at the first node. | 02-25-2010 |
20100062738 | APPARATUS AND METHOD FOR ELIMINATING OUTBAND INTERFERENCE SIGNAL - Provided is an apparatus and method for eliminating an outband interference signal. An apparatus for eliminating an interference signal includes a first mixer, a filter unit, a second mixer, and an operation unit. The first mixer downconverts a received signal containing an outband interference signal. The filter unit extracts the downconverted outband interference signal from the downconverted received signal. The second mixer upconverts the downconverted outband interference signal to restore the outband interference signal to the original frequency band. The operation unit subtracts and eliminates the restored outband interference signal from the received signal. | 03-11-2010 |
20100093300 | Data Collection and Simulation - A receiver receives at least one radio frequency band. A signal processor separates a signal space associated with the at least one signal in the at least one radio frequency band and a background space associated with interference and noise in the at least one radio frequency band. For a simulation, a memory stores the environment data of the at least one radio system based on the background space under control of the signal processor. | 04-15-2010 |
20100112970 | RADIO RECEIVING APPARATUS AND NOISE ELIMINATION METHOD IN THE SAME APPARATUS - A control section | 05-06-2010 |
20100130156 | OFFSET DIRECT CONVERSION RECEIVER - An offset direct conversion receiver apparatus and corresponding receiving method are provided. A received wireless signal is directly downconverted and demodulated to a baseband offset frequency that is offset from zero frequency to produce an in-phase (I) baseband offset signal centered at the baseband offset frequency and a quadrature-phase (Q) baseband offset signal centered at the baseband offset frequency. The I baseband offset signal and Q baseband offset signal are bandpass filtered to produce an I bandpass signal and a Q bandpass signal, respectively. The I bandpass signal and the Q bandpass signal are downconverted from the baseband offset frequency to zero frequency to produce an I baseband receive signal and a Q baseband receive signal. A technique and logic are also provided to select the best baseband offset frequency used in an offset direct conversion receiver. | 05-27-2010 |
20100144303 | METHOD AND APPARATUS FOR REMOVING DC OFFSET IN A DIRECT CONVERSION RECEIVER - A method and apparatus for correcting direct current (DC) offset errors of a received signal in a direct conversion receiver (DCR) are provided. DC offset correction algorithms are incorporated into the DCR, each algorithm being optimized for a particular receive signal operating environment. The DC offset correction algorithms remove DC offset errors in baseband In-phase and Quadrature-phase signals received within the direct conversion receiver baseband signal path. Individual DC offset correction algorithms are selected for use as determined by a signal quality estimator component. A DC offset correction component of the direct conversion receiver determines an appropriate DC offset correction algorithm suited for a particular operating environment. A criterion for a signal quality estimate is set to control transitioning between DCOC algorithms. A dual threshold strategy may be adopted to transition between one DC offset correction algorithm and another DC offset correction algorithm to provide hysteresis. | 06-10-2010 |
20100159865 | Interference cancellation for reconfigurable direct RF bandpass sampling interference cancellation - Sampling may be employed to cancel an analog input radio frequency (RF) signal by using an upconverted analog cancellation RF signal to cancel the analog input RF signal at the sample instances. At least two sampling paths may be employed, a signal path and a cancel path, and direct RF bandpass sampling may be included in both the signal and cancel paths. | 06-24-2010 |
20100167678 | RECEIVER CIRCUIT AND DATA TRANSMISSION SYSTEM - A receiver circuit which can suppress a voltage amplitude appearing on a transmission line. The receiver circuit, coupled to a first and a second transmission lines which transmit information by using currents, includes a first and a second current sources, a first and a second conversion sections which convert currents which flow respectively therein to voltages, a first transistor whose source is coupled to the first current source and to the first transmission line, and whose drain is coupled to the first conversion section, and a second transistor whose source is coupled to the second current source and to the second transmission line, and whose drain is coupled to the second conversion section. The gate and the drain of the first transistor are respectively coupled to the drain and the gate of the second transistor. | 07-01-2010 |
20100167679 | Method and Arrangement for Improved Model Order Selection - In a method of enabling model order selection for joint channel synchronization and noise covariance estimation of at least one received signal in a wireless communication network, generating S | 07-01-2010 |
20100184398 | METHOD AND SYSTEM FOR NOISE SUPPRESSION IN ANTENNA - A system includes an antenna to receive a communications signal, an amplifier coupled to the antenna to amplify the communications signal, and a processor coupled to the amplifier to process the communications signal using high-order statistics to suppress noise in the communications signal. The processor may use a bispectrum function to remove at least a portion of the noise, and at least one of the phase of the bispectrum and the amplitude of the bispectrum to reconstruct the communications signal. | 07-22-2010 |
20100203859 | BANDPASS FILTER, AND RADIO COMMUNICATION MODULE AND RADIO COMMUNICATION DEVICE USING SAME - A bandpass filter, and a radio communication module and device using the same are disclosed. Provided is the bandpass filter in which resonant electrodes ( | 08-12-2010 |
20100248674 | Switchable Mode Filter for Overlaid Signal Extraction in Noise - A method of extracting predetermined narrowband microwave signals having common transmission center frequency is presented through the teachings of the invention. In an embodiment of the invention a software based signal processing approach is employed to identify the microwave signals present and control an adaptive bandwidth filter to provide an approximately optimal transmission bandwidth of the adaptive bandwidth filter for the selected microwave signal and minimized noise into the correlation process. | 09-30-2010 |
20100267353 | APPARATUS AND METHODS FOR REDUCING INTERFERENCE IN RADIO-FREQUENCY APPARATUS - A converter in a radio-frequency (RF) apparatus includes a feedback circuitry. The feedback circuitry has a shielded input and a shielded output. The shielded input and the shielded output of the feedback circuitry tend to reduce interference in the converter. | 10-21-2010 |
20100291893 | SYSTEM AND METHOD FOR ENHANCING SENSITIVITY OF NARROW INFORMATION BANDWIDTH RECEIVERS - A radio frequency (RF) receiver having enhanced sensitivity is provided. In one embodiment, the receiver comprises at least one antenna, a preselector unit operative to receive an RF signal from the at least one antenna and output a preselected RF signal, and a frequency synthesizer operative to generate a signal at a predetermined synthesizer frequency. A mixer is operative to multiply the preselected RF signal and the predetermined synthesizer frequency and output a product signal. The receiver also includes an intermediate frequency (IF) filter unit that is operative to receive the product signal from the mixer and output an IF signal. The IF filter unit includes one or more narrow bandwidth filters having a bandwidth adequate to transmit information of interest. At least one of the narrow bandwidth filters comprises a carrier filter. | 11-18-2010 |
20100311378 | MULTIPLE MULTI-MODE LOW-NOISE AMPLIFIER RECEIVER WITH SHARED DEGENERATIVE INDUCTORS - A device with multiple multi-mode low-noise amplifiers (LNAs), each with common operating modes and separate operating frequency bands, are coupled to shared degenerative inductors for common operating modes. Common load inductors are coupled to the multi-mode LNA outputs to reduce the number of load inductors required. The multi-mode LNAs have parallel transistor gain stages and form part of an integrated circuit (IC) for use in a wireless communication receiver. Each multi-mode LNA has the capability to switch between at least one higher linearity transistor gain stage and at least one lower linearity transistor gain stage for different operating modes. Multiple lower linearity transistor gain stages for different multi-mode LNAs may be merged into a single lower linearity transistor gain stage shared among multiple multi-mode LNAs through multiple RF switches between a set of common RF inputs and common inputs and common input matching networks. | 12-09-2010 |
20100317309 | Antenna System And Method For Mitigating Multi-Path Effect - An antenna system and method utilize a splitter electrically connectable to a single antenna for splitting an RF signal into two signals. A variable phase shifter shifts the phase of one of the signals. A combiner combines the phase shifted and non-phase shifted signals to produce a conditioned signal. A quality examiner circuit changes the amount of phase shift provided by the variable phase shifter to produce a plurality of different conditioned signals. The quality examiner circuit then determines a quality of each conditioned signal and changes the phase shift again to provide the highest quality conditioned signal to a receiver. | 12-16-2010 |
20100323653 | DEVICE AND METHOD FOR MATRIXED ADAPTIVE EQUALIZING FOR COMMUNICATION RECEIVERS CONFIGURED TO AN ANTENNA ARRAY - An apparatus and method for signal optimization is disclosed. This disclosure relates to improved device and method for improving performance and reducing cosite interference for an antenna array. More particularly, this description relates to a device and method for equalizing signals for communication receivers, and more particularly, to a device and method for matrixed adaptive equalizing configured to a plurality of antennas for receiving one or more signals each designated for one of a plurality of receivers. | 12-23-2010 |
20110014887 | INTERFERENCE CANCELLATION - A receiver ( | 01-20-2011 |
20110014888 | RF RECEPTION SYSTEM AND INTEGRATED CIRCUIT WITH PROGRAMMABLE FILTER AND METHODS FOR USE THEREWITH - An integrated circuit includes an on-chip filter component that forms a programmable filter with the at least one off-chip filter component. An RF receiver generates inbound data in response to a received signal from the programmable filter. | 01-20-2011 |
20110014889 | BASEBAND SIGNAL PROCESSING TECHNIQUE - A baseband processing technique is described that permits to process in an analog signal domain a complex-valued baseband signal to laterally remove interference components resulting, for example, from in-band blocking signals. In an exemplary device implementation, the baseband processing device is configured to receive a baseband signal having a designated signal bandwidth defined by two opposite band edges, wherein a first frequency shift in a first direction toward a first band edge is impressed on the baseband signal. The device comprises a first filter stage adapted to filter the baseband signal exhibiting the first frequency shift to remove interference components behind the first band edge, a frequency shifter stage adapted to shift the filtered baseband signal by a second frequency shift in a second direction opposite the first direction towards a second band edge, and a second filter stage adapted to filter the baseband signal exhibiting the second frequency shift to remove interference components behind the second band edge. | 01-20-2011 |
20110021169 | NOISE REDUCTION SYSTEM AND METHOD - A noise reduction method is disclosed that uses numerical logic to estimate the value of the noise in a receive system and remove the noise. A surrogate probe value is selected and subtracted from an input signal and an iterative process selects a noise probe value for each iteration and the respective noise probe values are summed resulting in a noise estimate that is combined with the input signal. | 01-27-2011 |
20110021170 | Interference Cancellation with Time-Varying Interference and/or Distortion - A method and apparatus is disclosed to compensate for interference and/or distortion impressed onto a transmitted communications signal in the presence of one or more time-varying conditions. A communications receiver includes a noise analyzer to characterize the composition of the interference and/or distortion impressed onto a transmitted communications signal in the presence of one or more time-varying conditions. The noise analyzer may provide a selection signal indicating the composition of the interference and/or distortion impressed onto a transmitted communications signal in the presence of one or more time-varying conditions to be used by the communications receiver. In an exemplary embodiment, the communications receiver selects at least one set of filter coefficients to compensate for the interference and/or distortion impressed onto a transmitted communications signal in the presence of a particular time-varying interference and/or distortion condition. In another exemplary embodiment, the communications receiver selects a corresponding interference cancellation filter bank to compensate for the interference and/or distortion impressed onto a transmitted communications signal in the presence of the particular time-varying interference and/or distortion condition. | 01-27-2011 |
20110028113 | METHOD OF IMPROVING SENSITIVITY AND INTERFERENCE REJECTION IN WIRELESS RECEIVERS - A wireless receiver for receiving a signal with a characteristic pattern includes a predictor for predicting the presence of a non-zero value of the characteristic pattern. A tracker tracks a noise component in the received signal between predicted non-zero values. The resulting noise component is subtracted from the received signal to output a processed signal, which is then decoded by a pattern discriminator and demodulator. The wireless receiver is less sensitive to noise and interference. | 02-03-2011 |
20110028114 | APPARATUS COMPRISING A BROADCAST RECEIVER CIRCUIT AND PROVIDED WITH AN ANTENNA - The invention relates to an apparatus | 02-03-2011 |
20110039510 | COMMUNICATION DEVICE - A communication device according to the present invention which receives a reception signal, includes: an intermodulation oscillator that outputs a signal of a first frequency; an adding section that adds together the reception signal and the signal of the first frequency; an intermodulation wave generating section that generates an intermodulation wave signal from the reception signal and the signal of the first frequency that are added together; a local oscillator that outputs a local signal; a mixer that generates an intermediate frequency signal by mixing the local signal into the intermodulation wave signal; a bandpass filter that extracts a signal of a desired frequency from the intermediate frequency signal; a voltage level detection section that detects a voltage level of a desired signal; and a control section that causes the intermodulation oscillator to output the signal of the first frequency when the voltage level of the desired signal is greater than a saturation level of the receiving section, and causes the intermediate frequency signal to be generated by mixing the local signal whose frequency is controlled into the intermodulation wave signal. | 02-17-2011 |
20110053546 | OPTIMAL NARROWBAND INTERFERENCE REMOVAL FOR SIGNALS SEPARATED IN TIME - A system and method for improving the processing of communications signals received in the presence of narrowband interference signals. The received communications signals are time sampled and transformed into a series of spectral terms in the frequency domain that are then evaluated to identify narrowband interference signals. The identified narrowband interference terms can be calculated to a value that will optimize the corrupted spectral terms resulting from the communication, and an inverse transformation can be used to generate a time domain signal that is free from interference. | 03-03-2011 |
20110059713 | SIGNAL PROCESSING FOR MULTI-SECTORED WIRELESS COMMUNICATIONS SYSTEM AND METHOD THEREOF - The present invention provides an apparatus and a method that realize dynamically processing signals received from multiple sectors to increase throughput of uplink communications in a multi-sectored wireless base station. The signal streams received from sector- | 03-10-2011 |
20110059714 | Integrated Cancellation Circuit for RF Converter Spurious Tones - Techniques are disclosed for eliminating or otherwise sufficiently suppressing spurious signals. The techniques are particularly useful in applications such as those that employ aggressor frequency sources along with a frequency conversion or mixing function, and especially applications implemented as a system-on-chip. In the spur-training mode, a spur-canceller circuit identifies spurious tones associated with the host system to neutralize those tones when running in a normal mode. The tones are neutralized using a comb generator with variable phase and gain by way of cancellation with comb output signals having substantially the same amplitude and a phase that is 180° out of phase with the aggressor tone to be cancelled. | 03-10-2011 |
20110065406 | METHOD AND APPARATUS FOR PROCESSING SIGNAL - A signal processing method and system are provided. The method includes receiving an input signal within a first frequency range, the input signal including a desired signal and an interference signal. The method includes down-converting the input signal to a second frequency range, which is lower than the first frequency range, using an offset local oscillator signal having a frequency substantially equal to the central frequency of the desired signal. The method includes separating the interference signal from the down-converted input signal. The method includes up-converting the separated interference signal to the first frequency range. The method includes subtracting the up-converted interference signal from the input signal at the first frequency range to obtain an interference removed signal. The method includes down-converting the interference removed signal to a third frequency range, which is lower than the first frequency range, using a local oscillator signal, for demodulating. The frequency of the offset local oscillator signal is different from the frequency of the local oscillator signal. | 03-17-2011 |
20110065407 | JOINT SPACE-TIME OPTIMUM FILTERS (JSTOF) FOR INTERFERENCE CANCELLATION - A filter for reducing co-channel interference within a communications receiver may include a multi-channel, space-time filter circuit that filters n signal parts that have been split from a communications signal by jointly estimating space-time filter weights and multi-channel impulse responses (CIRs). The filter may further include a multi-channel, matched filter circuit that receives multi-channel signals from the multi-channel, space-time filter circuit and has a filter response that is provided by a channel impulse response estimation from the space-time filter circuit. | 03-17-2011 |
20110124307 | Systems and Methods for Cancelling Interferers in a Receiver - In some embodiments, systems and methods for cancelling interferers in a receiver, comprise: a first mixer in a main path that downconverts a first RF signal to form a main baseband or intermediate-frequency signal; and a second mixer in an alternate path that downconverts a second RF signal to form an alternate baseband or intermediate-frequency signal, wherein the first RF signal and the second RF signal are both based on a third RF signal, and wherein the main baseband or intermediate-frequency signal and the alternate baseband or intermediate-frequency signal, when combined, cancel out an interferer in the third RF signal. | 05-26-2011 |
20110171921 | METHOD AND APPARATUS FOR REMOVING ACOUSTIC INCIDENT SIGNAL - A method of removing a signal from among received signals, the method including: filtering the received signals; detecting a time band of the filtered received signals where an energy value of the filtered received signals exceeds a reference energy value; and applying a gain value to one or more received signals, from among the received signals, in the detected time band. | 07-14-2011 |
20110207426 | BROADCAST RECEIVING APPARATUS AND METHOD OF DETECTING NOISE COMPONENTS PERFORMED BY BROADCAST RECEIVING APPARATUS - To provide a broadcast receiving apparatus including an AM detector, an AM noise detector, an FM detector, an FM noise-level detector, and a threshold control unit. The AM detector performs AM detection on a broadcast signal in airwaves received by a receiving antenna that receives incoming airwaves to acquire an AM detection signal. The AM noise detector detects a signal portion, in which the AM detection signal exceeds an AM noise threshold, as an AM noise component. The FM detector performs FM detection on the broadcast signal to acquire an FM detection signal. The FM noise-level detector detects an FM noise level of the FM detection signal. When the FM noise-level detector detects the FM noise level of the FM detection signal, the threshold control unit changes setting of the AM noise threshold in the AM noise detector based on the FM noise level of the FM detection signal. | 08-25-2011 |
20110250860 | RECEIVER AND METHOD FOR DYNAMICALLY ADJUSTING SENSITIVITY OF RECEIVER - A receiver and a method for dynamically adjusting sensitivity of the receiver are provided. The receiver includes a detection unit and a receiving unit. The detection unit detects an input signal group, and outputs a detection result. The receiving unit receives the input signal group according to a sensitivity. Wherein, the receiving unit dynamically adjusts the sensitivity used for receiving the input signal group according to the detection result of the detection unit. | 10-13-2011 |
20110312293 | NOISE REMOVING APPARATUS - A noise removing apparatus includes a variable filter with a changeable cutoff frequency and a variable phase shifter with a changeable cutoff frequency, and switches between the variable filter and the variable phase shifter according to a result of detection of noise component. The variable filter has a circuit configuration corresponding to a function in which a transfer function of second or higher degree is represented as a product of primary factors. The transfer function of second or higher degree is calculated based on the phase characteristics of the variable phase shifter. | 12-22-2011 |
20110319045 | LINEAR INTERFERENCE CANCELLATION RECEIVER - Interference cancellation at a user equipment includes performing channel estimation for each component of an aggregate received signal using at least one received midamble of at least one time slot. The aggregate received signal is received from at least one Node B. A combined channel is computed for each channelization code based on the channel estimation. A linear transfer function is obtained for all user equipment within a cell. This linear transfer function includes a combined channel for each channelization code. An equalization matrix is derived from the linear transfer function and then applied to the aggregate received signal to obtain the component intended for the user equipment. | 12-29-2011 |
20120009891 | APPARATUS AND METHOD FOR PREVENTING OCCURRENCE OF ELECTROMAGNETIC INTERFERENCE IN PORTABLE TERMINAL - An apparatus and method for setting a modulation frequency within a non-use frequency range so as to reduce ElectroMagnetic Interference (EMI) occurring during frequency modulation in a portable terminal are provided. The apparatus includes a controller and a frequency set unit. At frequency modulation, the controller determines whether a modulation frequency corresponds to a frequency inducing EMI. In a case where it is determined that the modulation frequency corresponds to the frequency inducing EMI, the frequency set unit resets the modulation frequency. | 01-12-2012 |
20120040633 | MULTI-USER INTERFERENCE CANCELLATION IN A SINGLE-CARRIER RADIO RECEIVER - A method, apparatus, and radio receiver system for canceling multi-user interference in a single-carrier radio communication system. A front-end receiver such as a RAKE receiver receives a radio signal formatted in a sequence of frames, and outputs a plurality of user signals. A processing selector selects on a frame-by-frame basis, either a first signal processing chain that serially decodes and removes the interference contributions of the user signals, or a second signal processing chain that simultaneously decodes and removes the interference contributions of the user signals in parallel. The processing selector may select the first signal processing chain when the number of user signals is greater than or equal to a threshold value, and may select the second signal processing chain when the number of user signals is less than the threshold value. | 02-16-2012 |
20120083235 | COMPENSATING FOR UNWANTED DISTORTION IN A COMMUNICATIONS RECEIVER - Method and apparatuses are disclosed to substantially compensate for various unwanted interferences and/or distortions within a communications receiver. Each of these apparatuses and methods estimate the various unwanted interferences and/or distortions within the communications receiver. Each of these apparatuses and methods remove the estimates of the various unwanted interferences and/or distortions within the communications receiver from one or more communications signals within the communications receiver to substantially compensate for the various unwanted interferences and/or distortions. | 04-05-2012 |
20120083236 | Multimode Receiver with Active Blocker Suppression - Various embodiments of a wireless multimode receiver having an off-chip duplex filter associated with a multimode band, and a blocker cancellation circuit disposed on a semiconductor chip are described in the present disclosure. | 04-05-2012 |
20120108194 | METHOD AND ARRANGEMENT FOR INTERFERENCE MITIGATION - In a method of mitigating interference for received signals in a communication system, receiving S | 05-03-2012 |
20120108195 | METHOD FOR MATCHING AN ANTENNA OF A PORTABLE TERMINAL AND APPARATUS FOR SAME - The present invention relates to an antenna matching method and apparatus of a mobile terminal, and the antenna matching method of the present invention includes configuring a predetermined matching value for an antenna corresponding to a channel selected in broadcast reception mode and adjusting, when reception performance is degraded on the channel, the matching value. According to the present invention, it is possible to support adaptive control for optimizing the frequency matching characteristic according to the variation of the antenna performance using control signal. As a consequence, it is possible to provide the mobile terminal with optimal signal reception environment. | 05-03-2012 |
20120115429 | METHOD AND WIDEBAND ANTENNA SYSTEM TO MINIMISE THE INFLUENCE OF INTERFERENCE SOURCES - A method to minimize influence of interference sources by control of a signal to noise/interference ratio of a wideband antenna system connected to an electronic system. The wideband antenna system includes at least one array of at least two antenna elements/sub arrays. The signal to noise/interference ratio control includes establishing of cancellation directions for interfering frequencies in the antenna pattern in the direction of interference sources. The wideband antenna system is operational over a system bandwidth and operates with an instantaneous bandwidth. Estimation of interference source parameters is performed in an evaluation process. A wideband antenna system implementing the method. | 05-10-2012 |
20120122415 | WIRELESS COMMUNICATION DEVICE AND SIGNAL DETECTING METHOD - Disclosed is a wireless communication device capable of improving the properties of an interference canceller and improving reception performance without increase in circuit scale and without increase in power consumption. In the device, a channel estimation unit ( | 05-17-2012 |
20120129480 | APPARATUS FOR RECEIVING MULTIPLE INDEPENDENT RF SIGNALS SIMULTANEOUSLY AND METHOD THEREOF - An apparatus and method for receiving and processing multiple independent, uncorrelated RF signals is presented. The apparatus includes a Hybrid-Direct Conversion Receiver incorporating front end branches, protocol-specific digital processing branches, an interference detector, a correlator, and an offset control for controlling oscillator sources. The front end branches each contain a preselector that filters received signals and a mixer that down converts the received signal to an IF offset from a reference frequency by a unique offset. The bandwidth of an IF processor is partitioned into sub-channels corresponding to the different offsets and is wider than the combination of the sub-channels. The interference detector and correlator determine whether a particular desired signal is degraded by interference signals and select a new sub-channel. This information is provided to the offset control, which adjusts a LO source coupled to the corresponding down mixer accordingly. | 05-24-2012 |
20120142301 | Ultra Low Power, Low Noise Switched Capacitor Radio Frequency Mixer - Presented herein are systems, methods, and apparatus for ultra-low power, low noise switched capacitor radio frequency mixer. In one embodiment, there is described a method for mixing a signal. The method comprises mixing with a mixer, a received signal with a mixing signal to generate a mixed signal. The mixing signal comprises an in-phase component and an out-of-phase component and a desired frequency. The mixed signal comprises a mixed in-phase component and a mixed out-of-phase component. The method also comprises mixing one of the mixed in-phase component and the mixed out-of-phase component based on the mixing signal. | 06-07-2012 |
20120178396 | SYSTEM AND METHOD FOR RADIO SIGNAL RECONTRUCTION USING SIGNAL PROCESSOR - A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be conventionally mixed and demodulated to extract useful signal information with enhanced receiver fidelity and sensitivity. | 07-12-2012 |
20120238231 | Dynamic AC-Coupled DC Offset Correction - A method, using an AC-coupled filter, reduces DC offset in a downconverted signal in a wireless receiver receiving a signal including a preamble, the method including: changing the corner frequency of the AC-coupled filter a plurality of times during reception of the preamble. In another implementation, a receiver includes a DC offset correction system. The receiver includes a mixer downconverting a received signal to form a downconverted signal; a first AC-coupled high pass filter having an input in at least one-way data communication with the mixer, the first AC-coupled high pass filter having a switchable corner frequency dependent on a frame state of a received signal; and a plurality of second AC-coupled high pass filters coupled to an output of the first AC-coupled high pass filter, each of the plurality of second AC-coupled high pass filters have a switchable corner frequency. | 09-20-2012 |
20120295565 | SYSTEM AND METHOD FOR ANALOG INTERFERENCE SUPPRESSION IN PULSED SIGNAL PROCESSING - A method for suppressing interference signals within a waveform includes performing an analog Fourier transform on the waveform with a hardware circuit to obtain an amplitude spectrum having a plurality of frequency bins and computing a noise floor spectrum from the amplitude spectrum to obtain a noise floor spectrum; creating a threshold spectrum based on the noise floor spectrum. The method also includes replacing the amplitude of each bin of the amplitude spectrum that exceeds a corresponding bin of the threshold spectrum with an alternative value to form a corrected spectrum and performing an analog inverse Fourier transform on the corrected spectrum thereby suppressing interference signals within the waveform. | 11-22-2012 |
20120329418 | LOW NOISE AMPLIFIER PROTECTION USING A CLAMPING DEVICE - Embodiments of a radio frequency (RF) receiver implementing one or more forms of protection to protect devices of the RF receiver from in-band interferers is provided. The RF receiver includes an integrated circuit terminal configured to couple a RF signal received at an antenna to a RF signal path, and a low noise amplifier (LNA) coupled to the RF signal path and configured to amplify the RF signal to provide an amplified RF signal. To protect the LNA from in-band interferers, the RF receiver can further include one or more clamping circuits and/or an over-voltage detector to determine if a peak of the RF signal exceeds an acceptable level. | 12-27-2012 |
20130023225 | SELECTIVE-SAMPLING RECEIVER - A receiver that selectively samples a received signal in order to suppress an interference component of the signal while recovering a desired component. The selective sampling may be accomplished by low cost, low complex analog or digital circuitry. The receiver includes a first input that receives a first signal, including a desired signal component and an interference signal component and a second input that receives a second signal including the interference component only. The first and second signals are then provided to the sampling circuitry. First, the phase of the interference component of the both the first and second signals is aligned. Next, the points in a wave cycle that the second signal is at a power minimum are detected. Finally, first signal is sampled close to the point when the second signal is at the power minimum to recover the desired signal component and suppress the interference component. | 01-24-2013 |
20130059557 | DYNAMIC RFI DETECTION - Provided herein are different embodiments for performing radio frequency interference (RFI) detection in electronic devices such as mobile computing systems. | 03-07-2013 |
20130102267 | DETECTION AND MITIGATION OF INTERFERENCE IN A MULTIMODE RECEIVER USING VARIABLE BANDWIDTH FILTER - Embodiments include a novel receiver architecture to optimize receiver performance in the presence of interference. In various embodiments, power estimation circuits are used to determine the exact nature of the interference and to optimize the performance correspondingly. Variable selectivity of at least one power estimation circuit is achieved using a filter with variable bandwidth, with power measurements taken using different bandwidth settings. Also, the actual method of optimizing the receiver performance is novel compared to the prior art in that the gain settings and the baseband filter order (stages to be used) will be optimized based on the nature of the interference as determined by the power detector measurements. For a device such as a cellular phone that operates in a dynamic and changing environment where interference is variable, embodiments advantageously provide the capability to modify the receiver's operational state depending on the interference. | 04-25-2013 |
20130143510 | RECEIVING DEVICE AND METHOD FOR REMOVING MISMATCH IN WIRELESS COMMUNICATION SYSTEM, AND LOW-POWER AMPLIFIER THEREFOR - The present invention relates to a receiving device and method for removing a mismatch in a wireless communication system, and to a low noise amplifier (LNA) therefor. According to the present invention, the receiving method for removing the mismatch comprises the steps of: distinguishing the type of input signal received through a wireless network; controlling such that a common bias is applied to transistors within a low noise amplifier, if said input signal is a wideband signal; and outputting a signal from which said mismatch has been removed, by using a current mirror mode in which current paths within said low noise amplifier are crossed. | 06-06-2013 |
20130157604 | HARMONIC CANCELLATION FOR FREQUENCY CONVERSION HARMONIC CANCELLATION - A radio frequency (RF) receiver, such as a television tuner, includes a harmonic cancellation circuit. The harmonic cancellation circuit includes a primary signal path to generate a first intermediate frequency (IF) signal by mixing an RF signal with a reference signal and a harmonic feedforward signal path to generate a second IF signal representing signal content of the RF signal near an nth-order harmonic of a frequency f | 06-20-2013 |
20130157605 | SYSTEM AND METHOD FOR DETECTION OF RF SIGNAL SPOOFING - One embodiment of the invention includes a radio frequency (RF) receiver system. The system includes an antenna configured to receive an RF input signal and an RF signal front-end system configured to process the RF input signal to generate an equivalent digital signal. The system also includes a spoof detection system configured to analyze a power spectral density (PSD) of the equivalent digital signal and to compare the PSD of the equivalent digital signal with a predetermined baseline PSD to detect the presence of a spoofing signal component in the RF input signal. | 06-20-2013 |
20130244607 | DUAL RECEIVE FILTER - A stage is provided for a receiver of a wireless device. The stage comprises a matching network that separates amplified signals of interest received from an amplifier from amplified unwanted signals received from the amplifier in conjunction with additional downstream filters. The stage also comprises a signal path that comprises components for receiving and processing the amplified signals of interest, and a shunt path that comprises components for adjusting reflected energy sent back to the amplifier for limiting the output swing of the amplifier in a frequency band corresponding to the amplified unwanted signals. | 09-19-2013 |
20130252568 | Devices and Methods Using the Hermetic Transform - Systems and methods are described using a Hermetic Transform, as well as related transforms, for applications such as directional reception and/or transmit of signals using phased-array devices and systems. The systems and methods an include identifying a direction of arrival for a mobile communicating device. | 09-26-2013 |
20130295868 | System and Method for Performing Automatic Gain Control in Mobile Phone Environments - A Dynamic Noise Compensation (DNC) telephone speech enhancement algorithm addresses the issue of environment noise on the listener end of a telephone call. A single microphone proximal to the listener provides a sample of near end ambient noise level and of near end speech. A Voice Activity Detector (VAD) detects the presence of near end (listener) speech. The DNC algorithm adjusts the far end incoming speech level based on the near end ambient noise and the VAD ensures that the near end listener speech does not effect the incoming speech level adjustment. | 11-07-2013 |
20140038541 | Link 16-Based Geolocation Of Hostile Jammers - A method for Link 16-based geolocation of hostile jammers comprising the steps of collecting jamming noise I/Q samples at a plurality of locations, determining the relative time delay of reception between two or more of the locations, determining the first derivative of the time delay of reception between the two or more locations, and using the results calculated in the preceding step to determine the position of the hostile jammers. | 02-06-2014 |
20140087678 | APPARATUS AND SYSTEM FOR RECEIVING WIRELESS SIGNAL WITH ANTI-JAMMING - The apparatus for receiving a wireless signal with anti-jamming includes: a wireless signal receiving unit receiving a wireless signal and including at least one antenna; and a jamming signal blocking unit disposed in front of the wireless signal receiving unit to block a jamming signal input from at least one direction and having a size or an interval from the wireless signal receiving unit determined according to at least one of an antenna pattern of the wireless signal receiving unit, a direction in which the jamming signal is input, and a level of the jamming signal. According to an exemplary embodiment of the present invention, it is possible to smoothly receive a targeted signal while blocking the jamming signal under the environment in which a general signal and the jamming signal coexist. | 03-27-2014 |
20140171006 | WIDEBAND RECEIVER ROBUST TO RADIO FREQUENCY HARMONICS - A radio frequency (RF) noise-cancelling receiver includes first transconductance cells configured to produce respective weighted current signals proportional to an input voltage signal. The RF receiver includes frequency conversion cells coupled to the first transconductance cells and configured to mix the weighted current signals with a plurality of non-overlapping local oscillator (LO) signals to produce downconverted current signals. The RF receiver includes transimpedance amplifiers coupled to the frequency conversion cells and configured to produce output voltage signals proportional to the downconverted current signals. The transimpedance amplifiers include second transconductance cells. Each of the first and second transconductance cells has an effective transconductance of a first magnitude for frequency components of the input voltage signal arising from a first harmonic and an effective transconductance of a second magnitude less than the first magnitude for frequency components of the input voltage signal arising from harmonics at integer multiples of the first harmonic. | 06-19-2014 |
20140213210 | Method of Robust Receive (Rx) Processing for Radio Frequency Coexistence Management in Dual-SIM-Dual-Active Communication Devices - The various embodiments include a dual-SIM-dual-active (DSDA) device and methods for implementing robust receive (Rx) processing to resolve radio frequency coexistence interference between two subscriptions operating on the DSDA device. The DSDA device may detect when a subscription (the “aggressor”) de-senses the other subscription (the “victim”) as a result of the aggressor's transmissions, and in response, implement robust Rx processing to mitigate the effects of de-sense on the victim while causing minimal impact to the aggressor. | 07-31-2014 |
20140220922 | SIGNAL PROCESSING CIRCUIT WITH CIRCUIT INDUCED NOISE CANCELLATION - A signal processing circuit with noise cancellation includes an impedance matching unit and a transconductance stage. The impedance matching unit is disposed at a first path, and arranged to provide input impedance matching, wherein the impedance matching unit is a passive element, and the first path is coupled between a signal input port and a signal output port. The transconductance stage is disposed at a second path, and arranged to guide circuit introduced noise to the signal output port for noise cancellation at the signal output port, wherein the second path is coupled between the signal input port and the signal output port. | 08-07-2014 |
20140235192 | PREDICTION-BASED FM STEREO RADIO NOISE REDUCTION - The present document relates to audio signal processing, in particular to an apparatus and a corresponding method for improving the audio signal of an FM stereo radio receiver. In particular, the present document relates to a method and system for reducing the noise of a received FM stereo radio signal. An apparatus ( | 08-21-2014 |
20140248847 | RECEIVER AND A METHOD FOR MOBILE COMMUNICATIONS - In a method and a mobile communications receiver for processing signals from a first cell and a second cell a timing of the signal from the first cell and the second cell is obtained. A timing difference (δ) between the timings of signals from the first and the second cell is determined and based on that a timing (κ) for a window for discrete Fourier transform, DFT, processing is adjusted. DFT processing of the signals using the timing (κ) of the DFT window is then performed. | 09-04-2014 |
20140256277 | EQUALIZER-BASED RECEIVER IN MOBILE COMMUNICATION SYSTEM AND METHOD FOR RECEIVING SIGNAL USING THE SAME - A method for receiving a signal using an equalizer-based receiver is provided. The method includes compensating for a phase offset of a received signal for each of M cells, and performing channel estimation on the phase offset-compensated received signal for each of the M cells, compensating for an inter-cell timing offset in a channel estimate for each of the M cells, reconstructing an interference component of a reference signal using the compensated channel estimate for each of the M cells, regenerating a phase offset difference between the serving cell and each of the multiple interfering cells for each of the M cells, adding the phase offset difference to the interference component of a reference signal for each of the M cells, cancelling, from the received signal, the interference component of a reference signal with the phase offset for each of the M cells, and equalizing the interference component-cancelled received signal. | 09-11-2014 |
20140273906 | WIRELESS COMMUNICATION SYSTEM WITH INTERFERENCE REJECTION MECHANISM AND METHOD OF OPERATION THEREOF - A method of operation of a wireless communication system includes: filtering a composite input from a radio frequency signal; developing a raw digital stream by applying an analog correction to the composite input; sampling an extracted signal, from the raw digital stream, by a primary analog-to-digital converter; and monitoring, by a correction control block, the extracted signal including adjusting the analog correction by a digital control from the correction control block. | 09-18-2014 |
20140329484 | JAMMER RESISTANT NOISE CANCELLING RECEIVER FRONT END - Techniques for providing a jammer-resistant noise-cancelling receiver front end with band-pass impedance matching and good power efficiency. In an aspect, the center frequency of the band-pass impedance matching advantageously tracks the local oscillator frequency. In an aspect, first and second receive signal paths are provided, with an R-C network coupled to the output of the second receive signal path. The resistance of the R-C network may be selected to provide band-pass impedance matching to the RF input signal. The current outputs of the first and second signal paths are combined using a trans-impedance amplifier (TIA). In an aspect, the TIA may be implemented using a dual input transconductor amplifier to further optimize the noise performance and power efficiency features of the disclosure. | 11-06-2014 |
20140329485 | Method And Apparatus For Beamforming - An example method of tactical communication is provided. The method includes receiving information indicating a tactical situation associated with a target area. The tactical situation is one of a missile in-flight, an eavesdropper, a signal jammer, and a transceiver located in a zone of interest. The method further includes performing a beamforming process including instructing transmission of a plurality of signaling beams from one or more transmitters toward the target area. The tactical situation may be associated with a foe and the plurality of signaling beams generate interference inhibiting communication with by the foe. The tactical situation may be associated with a friend and the plurality of signaling beams generate decodable signal for enhancing communication with the friend. | 11-06-2014 |
20140364077 | MULTI-BAND INTERFERENCE OPTIMIZATION - RF communications circuitry, which includes a first RF filter structure and control circuitry, is disclosed. The first RF filter structure includes a pair of weakly coupled resonators and a first tunable RF filter. The control circuitry provides a first filter control signal. The first tunable RF filter receives and filters an upstream RF signal to provide a first filtered RF signal, such that a center frequency of the first tunable RF filter is based on the first filter control signal. | 12-11-2014 |
20150011172 | METHODS AND APPARATUS FOR ADAPTIVE NONLINEAR COINCIDENT INTERFERENCE CANCELLATION - Methods and apparatus to cancel an interfering signal using an analog cancellation stage followed by a digital cancellation stage. In an exemplary embodiment, the interfering signal is processed to determine modulation type for removal in the analog domain. The digital stage provides further interference reduction in the digital domain. | 01-08-2015 |
20150017941 | METHOD AND APPARATUS FOR USING ERASURE TO IMPROVE SIGNAL DECODING DURING AN INTERFERENCE EVENT - A method and apparatus for using erasure to improve signal decoding when data is impacted by an interference event. Embodiments may include receiving in an RF receiver a desired on-channel signal that includes an information signal modulated on to the desired on-channel signal; generating a sampled received signal with an analog-to-digital (A/D) converter; detecting an interference event using an interference detector as well as generating a mask based on the interference event; processing the sampled received signal using the mask to generate decoding data for use by a soft decoder; and, providing the decoding data to the soft decoder. | 01-15-2015 |
20150038098 | FILTERING INTERFERENCE IN WIRELESS NETWORKS - A first device may receive a parameter to identify interference associated with a frequency; identify the frequency based on the parameter; filter signals associated with the frequency to prevent a second device from receiving the signals associated with the frequency; and provide information identifying the frequency to the second device to cause the second device to prevent a data flow from being assigned to the frequency. | 02-05-2015 |
20150065075 | RECEIVING DEVICE AND METHOD FOR REMOVING MISMATCH IN WIRELESS COMMUNICATION SYSTEM, AND LOW-POWER AMPLIFIER THEREOF - The present invention relates to a receiving device and method for removing a mismatch in a wireless communication system, and to a low noise amplifier (LNA) therefor. According to the present invention, the receiving method for removing the mismatch comprises the steps of: distinguishing the type of input signal received through a wireless network; controlling such that a common bias is applied to transistors within a low noise amplifier, if said input signal is a wideband signal; and outputting a signal from which said mismatch has been removed, by using a current mirror mode in which current paths within said low noise amplifier are crossed. | 03-05-2015 |
20150079918 | COMPUTING SYSTEM WITH INTERFERENCE CANCELLATION MECHANISM AND METHOD OF OPERATION THEREOF - A computing system includes: a communication unit configured to determine an interfering interface based on a device location for locating an interference-aware receiver for processing a receiver signal including an interference signal described by the interfering interface; and an inter-device interface, coupled with the communication unit, configured to communicate the interfering interface for communicating the interfering interface to the interference-aware receiver for processing the interference signal or a further instance thereof. | 03-19-2015 |
20150087255 | WAKE-UP RECEIVER WITH AUTOMATIC INTERFERENCE REJECTION - A low power radio is provided with automatic interference rejection. The radio is comprised generally of: an antenna, a rectifier, a comparator, and a correlator. The comparator receives an input signal from the rectifier, compares the input signal to a reference signal and outputs a digital signal. The correlator in turn receives the digital signal from the comparator, correlates the digital signal to a wake-up code and outputs a wake-up signal having a high value when the digital signal is highly correlated with the wake-up code. The radio further includes an automatic threshold controller which adjusts sensitivity of the comparator. Of note, the rectifier, the comparator, the correlator and the automatic threshold controller are comprised in part by circuits having transistors operating only in subthreshold region. | 03-26-2015 |
20150118986 | METHOD AND APPARATUS FOR MITIGATING RADIO FREQUENCY INTERFERENCE (RFI) IN AN ELECTRICAL DEVICE - A method and circuit for mitigating RFI in an electronic device that occurs while the device is in a low power mode utilizes one or more antenna elements in the device to receive RF energy. When the RF energy is sufficiently high that it could affect signal states in the device while in the low power mode, the device transitions from the low power mode to an active mode and begins an RFI mitigation process to ensure signal states and other circuit operations in the device are not changed by the RFI. | 04-30-2015 |
20150126146 | NON-LINEAR INTERFERENCE CANCELLATION FOR MULTIPLE RECEIVER ANTENNAS - Various embodiments are disclosed for implementing joint non-linear interference cancellation (NLIC) in communication receivers with multiple receiver antennas to cancel or mitigate self-jamming interference from the same aggressor transmitter. A victim receiver may exploit the correlated nature of the interference signals received by the multiple receiver antennas to reduce the computational complexity of an NLIC scheme and improve performance. The victim receiver may select an Rx antenna/Rx chain that experiences the strongest interference from the aggressor transmitter and may perform a full NLIC operation using Tx data from the aggressor transmitter to estimate the strongest interference signal. The NLIC operation may estimate each remaining interference signal by applying a complex coefficient from a single-tap adaptive filter to the estimate of the strongest interference signal. The victim receiver may remove the estimated interference signals from the Rx signals of the respective Rx chains to cancel or mitigate the interference. | 05-07-2015 |
20150147994 | Methods for Interference Cancellation and Suppression with Network Assistance - A method for a receiver to cancel or suppress co-channel interference with network assistance is provided. The method comprises deriving a first set of parameters related to interfering signals in a mobile communication network; receiving a second set of parameters related to the interfering signals from the network; and cancelling the contribution of interfering signals from the received signal based on the combination of the first set and second set of parameters. In one embodiment, the interfering signals comprise intra-cell interfering signals and/or inter-cell interfering signals. While inter-cell interference comes from neighboring cells, intra-cell interference comes from MU-MIMO transmission to other users in the same serving cell as the victim UE. In one example, the serving base station not only signals information to the victim UE for inter-cell interference, but also for intra-cell interference due to MU-MIMO transmission. | 05-28-2015 |
20150295601 | System and Method for Frequency Reuse for Wireless Point-To-Point Backhaul - A system and method for frequency reuse for wireless point-to-point backhaul. Frequency reuse is enabled through the cancellation of interfering signals generated by interference sources. In one embodiment, a conventional dish antenna is complemented with one or more additional auxiliary antennas (e.g., isotropic). The one or more additional auxiliary antennas enable cancellation of interfering signals whose direction of arrival (DOA) is off the dish antenna's bore-sight. | 10-15-2015 |
20150303954 | SYSTEM, METHOD, AND APPARATUS FOR ANALOG SIGNAL CONDITIONING OF HIGH-SPEED DATA STREAMS - A device includes circuitry configured to receive a signal burst, apply one or more filters to the signal burst based to achieve a predetermined image rejection rate, apply at least one harmonic rejection mode to the signal burst, and amplify the signal burst based on a gain partitioning determination. | 10-22-2015 |
20150311930 | ANTENNA SYSTEM CALIBRATION - A method for calibrating an antenna system ( | 10-29-2015 |
20150365180 | METHOD AND NETWORK NODE FOR MITIGATION OF INTERFERENCE - A method and network node of a first cellular network, for enabling mitigation of interference in the first cellular network caused by radio communication in a second cellular network. The network node obtains a total interference in a first cell of the first cellular network, and estimates a first interference contribution in the first cell caused by radio communication in the first cellular network. The network node then determines a second interference contribution in the first cell caused by radio communication in the second cellular network based on the estimated first interference contribution and the obtained total interference. The network node also utilizes the determined second interference contribution to counteract the interference in the first cell caused by the radio communication in the second cellular network. Thereby, it is possible to counteract the interference in the first cell when the second interference contribution fulfills a threshold condition such that actions and measures for counteracting the inter-system interference can be initiated only when needed or when it is deemed effective for improving performance in the cell. | 12-17-2015 |
20160006468 | PROCESSING INTERFERENCE IN A WIRELESS NETWORK - Interference (I | 01-07-2016 |
20160099734 | AGGREGATE SIGNAL AMPLIFICATION DEVICE AND METHOD - A surface acoustic wave (SAW) filter that receives an aggregate circuit and outputs two or more sub-signals on outputs each of a different frequency band. The sub-signals are amplified by low noise amplifiers and, in one implementation, the amplified sub-signals can be summed. The outputs are connected via a switched passive network so that portions of the sub-signals on the outputs that are not in the selected frequency band are at least partially terminated. | 04-07-2016 |
20160126992 | Inter-Radio Access Technology Spur Mitigation - Various embodiments provide methods, devices, and non-transitory processor-readable storage media for mitigating local oscillator (LO) spur interference between radio access technologies (RATs) operating on a multi-active communication device. The various embodiments provide methods, devices, and non-transitory processor-readable storage media to determine residual frequency error for a multi-active communication device and generate LO spur handling tables that may enable the multi-active communication device to compensate for the residual frequency error. A multi-active communication device may mitigate LO spurs by applying mitigation techniques to one or more RATs according to the LO spur handling tables. A multi-active communication device may mitigate LO spurs by turning off a LOs for one or more RATs according to the LO spur handling tables. | 05-05-2016 |
20160173148 | MITIGATING SIGNAL INTERFERENCE IN A WIRELESS NETWORK | 06-16-2016 |
20160191089 | VERY LOW INTERMEDIATE FREQUENCY (VLIF) RECEIVER AND METHOD OF CONTROLLING VLIF RECEIVER - A very-low intermediate frequency (VLIF) receiver and a method of controlling a VLIF receiver. The method comprises receiving a first signal, the first signal including a first adjacent channel interferer, and detecting first interference from the first adjacent channel interferer. The method further comprises, subsequent to receiving the first signal, receiving a second signal, the second signal including a second adjacent channel interferer, and detecting second interference from the second adjacent channel interferer. Furthermore, subsequent to detecting the second interference, the VLIF receiver is configured to avoid the first interference while receiving a third signal. | 06-30-2016 |