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Measuring or testing of receiver

Subclass of:

455 - Telecommunications

455130000 - RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
455226200 Signal strength 64
455226300 Signal-to-noise ratio 26
455226400 With meter or indicator 10
Entries
DocumentTitleDate
20130029623RADIO COMMUNICATION SYSTEM, RECEIVER, AND COMMUNICATION METHOD - A radio communication system includes: a receiver that is configured to receive a first radio wave sent according to a remote keyless entry system and a second radio wave sent according to a tire pressure monitoring system; and a reception mode switching unit that sets a reception mode of the receiver to a first reception mode, in which the first radio wave is received, when an ignition switch of a vehicle is off, and sets the reception mode to a second reception mode, in which the second radio wave is received, when the ignition switch of the vehicle is on. If the reception mode switching unit receives a first request to set the reception mode to the first reception mode while the reception mode is set to the second reception mode, the reception mode switching unit sets the reception mode to the first reception mode.01-31-2013
20110195684METHODS AND APPARATUS FOR INTERFERENCE DECREASE/CANCELLATION ON DOWNLINK ACQUISITION SIGNALS - A method, an apparatus, and a computer program product for receiving a signal including components from a plurality of cells, estimating a channel from the received signal using one or more channel estimation schemes, removing a component signal using the estimated channel from the received signal to generate a processed signal and detecting a residual signal in the processed signal.08-11-2011
20120244825Statistical Gain Control In A Receiver - A radio frequency (RF) signal is received in a receiver, and various counts based on information from the signal can be obtained. Counts of a number of samples of the RF signal exceeding first and second thresholds can be accumulated during an accumulation window. From the first of these counts, it can be determined if the count exceeds a first metric corresponding to a first predetermined count value, and if so, a gain of an RF gain element can be reduced. From the second of these counts it can be determined if this count exceeds a second metric corresponding to a second predetermined count value, and if not, the gain can be increased.09-27-2012
20130084818Performing Power Control In A Receiver Based On Environmental Noise - In one embodiment, a method includes receiving and processing an incoming radio frequency (RF) signal in a receiver. Based on this signal, an environmental noise level can be determined, where this level corresponds to environmental noise present in an environment in which the receiver is located. Then, if the environmental noise level is substantially greater than receiver-generated noise, power consumption of at least one analog front end component of the receiver can be reduced.04-04-2013
20130040592ANALOG FILTER IN WIRELESS TRANSMISSION/RECEPTION DEVICE AND METHOD FOR SETTING CUT-OFF FREQUENCY USING THE SAME - A method and an apparatus are provided for setting a cut-off frequency of an analog filter of a reception device for wireless communication. A deviation value is obtained that corresponds to an error between a first gain value based on an ideal transfer function curve and a second gain value based on a measured transfer function curve at an arbitrary frequency of a frequency band in which a constant interval is maintained between a slope of the ideal transfer function curve and a slope of the measured transfer function curve. A cut-off frequency that is used to measure the measured transfer function curve in a real environment, is corrected based on the obtained deviation value.02-14-2013
20090186588Method and apparatus for determining context information using electromagnetic interference patterns - The exemplary embodiments of this invention describe a method for determining context information using EMI patterns. The method includes determining emitter information of a measured interference signal. A context is determined based upon the emitter information. Determining the interference signal emitter may also include comparing the measured interference signal to known interference signals. At least one setting of a device may be changed based upon the determined context. Various embodiments of apparatus are also described.07-23-2009
20120164964APPARATUS FOR RADIO CHANNEL MEASUREMENT USING MULTIPLE-ANTENNA SYSTEM - Provided is a radio channel measurement apparatus including: a multiple-antenna system including at least two antennal elements; a single-path processor; and a multiple-path processor to partition the at least two antenna elements into a predetermined number of groups, to sequentially amplify signals received through the at least two antenna elements for each group, and to sequentially output the amplified signals to the single-path processor.06-28-2012
20130045703Method for Spectrum Sensing and Communication Device - A method for spectrum sensing is described comprising receiving a signal using a plurality of receive antennas; forming a set of received signals including the received signal of each antenna; determining a cyclic auto-correlation of the set of received signals; estimating, for each receive antenna, channel state information of the radio channel via which the receive antenna receives the signal based on the determined cyclic auto-correlation; performing maximum ratio combining of the received signal samples based on the estimated channel state information; determining a measure of the cyclostationarity of the received signal based on the result of the maximum ratio combining; and performing cyclostationarity detection spectrum sensing based on the determined measure of the cyclostationarity of the received signal.02-21-2013
20130090078METHOD AND SYSTEM FOR LOCATING INTERFERENCES BY FREQUENCY SUB-BAND - Method and system for locating sources interfering on a signal received by a receiver comprising an array of antennas, comprising the following steps: 04-11-2013
20090036078Unified STTD/CLTD dedicated pilot processing - Apparatus and method to provide unified STTD/CLTD dedicated pilot processing in a wireless receiver. The technique allows different set of parameters to be introduced to a same processing module to process STTD and CLTD diversity signals to recover a pilot signal. Introducing another set of parameters to the processing module also allows processing of a non-diversity signal to recover a pilot. The unified processing of STTD/CLTD signals is achieved by converting STTD/CLTD pilot bits as Hadamard-like bits and processing these bits along with orthogonal pilot bits which are encoded as Hadamard encoded bits.02-05-2009
20090203337IDENTIFICATION OF TARGET SIGNALS IN RADIO FREQUENCY PULSED ENVIRONMENTS - A system and method to detect a signal of interest. In one embodiment, the system comprises a memory including a first parameter value, a second parameter value, a third parameter value and a program to identify active video values and null values in a first plurality of signals including the signal of interest. The system includes an interface portion adapted to receive a second plurality of signals based upon power levels of a first plurality of signals. The signal of interest is detectable based on the first, second and third parameter values.08-13-2009
20090233564TECHNIQUES FOR EFFICIENT CARRIER RECOVERY FOR PASSBAND COMMUNCIATION SYSTEMS - A method, apparatus, and article containing computer instructions are described. In an embodiment an apparatus includes a radio-frequency receiver to receive a training packet. The receiver may include a processor. The processor may include modules for performing carrier recovery. A coarse estimator module may derive a coarse frequency offset from the training packet; and a fine estimator module may derive a fine frequency offset from the training packet substantially simultaneously and in parallel with the coarse estimator module. A carrier recovery module may perform carrier recovery using the fine and coarse frequency offsets.09-17-2009
20100015936METHOD AND SYSTEM FOR MEASURING RECEIVER MIXER IQ MISMATCH - A system for correcting an IQ mismatch in a receiver mixer is disclosed and may include one or more circuits that generate an IQ correlation with a training signal having periodic, uncorrelated I and Q signals. The one or more circuits may estimate a gain mismatch based on a power estimate of the periodic, uncorrelated I and Q signals over a unit period. The one or more circuits may estimate a phase mismatch based on the IQ correlation over the unit period, and may apply at least one correction parameter to the receiver mixer. The at least one correction parameter may be based on the gain mismatch estimate and the phase mismatch estimate. The one or more circuits may provide the training signal on a closed RF signal path between a transmitter and the receiver mixer, and may estimate the IQ mismatch iteratively.01-21-2010
20120238229Carrier Selection for Multiple Antennas - A method and apparatus is disclosed to process a received single stream communication signal and/or a multiple stream communication. A communications receiver is configured to receive the received communication signal. A communications receiver determines whether the received communication signal includes a single stream communication signal or a multiple stream communication signal. The communications receiver determines whether a received communication signal complies with a known single stream communications standard. The communications receiver determines whether the received communication signal complies with a known multiple stream communications standard. The communications receiver decodes the received communication signal according to the known single stream communications standard upon determining the received communication includes the signal single stream communication signal. The communications receiver decodes the received communication signal according to the known multiple stream communications standard upon determining the received communication includes the multiple stream communication signal.09-20-2012
20090093227RADIO RECEIVER - There is provided a method of configuring a radio receiver, the radio receiver comprising signal receiving means, and at least one adjustable component coupled to the signal receiving means; the method comprising setting the at least one component to a first value selected from a plurality of values; measuring the quality of a signal received via the signal receiving means and the at least one adjustable component; repeating the steps of setting and measuring for at least a second value selected from the plurality of values; and determining the value of the at least one adjustable component that provides the highest measured signal quality.04-09-2009
20110130108RADIO RECEIVER, RADIO COMMUNICATION SYSTEM, RADIO COMMUNICATION METHOD, AND PROGRAM - A radio receiver including a sampling unit, a provider, an arithmetic operation unit, an estimator, and a converter. The sampling unit samples a baseband signal transmitted from the radio transmitter, at a fractional multiple of a symbol rate, and generates fractional-multiple-sampling data. The provider provides reference data in which the known symbol sequence arranged in a frame by the radio transmitter is interpolated at a rate of the fractional multiple. The arithmetic operation unit performs an arithmetic operation for evaluation data in which the degree of consistency in waveform between the fractional-multiple-sampling data and the reference data is evaluated. The estimator estimates a reference timing from a shift amount at which the evaluation data shows the maximum degree of consistency in waveform. The converter converts the fractional-multiple-sampling data by using the reference timing as a reference thereby recovering the data having the symbol rate.06-02-2011
20110287728UPLINK CALIBRATION SYSTEM WITHOUT THE NEED FOR A PILOT SIGNAL - An antenna array for a mobile communications system comprises a plurality of receive paths and a calibration signal processor. The receive paths are connected between an antenna elements and an analogue-to-digital converters. The calibration signal processor comprises a cross-analyzer for cross-analyzing the digitised receive signals of the plurality of receive paths with each other, an averager for forming a temporal average of an output of the cross-analyzer, the temporal average indicating a receive signal relationship between the digitised receive signals of the plurality of receive paths, wherein the calibration signal processor is adapted to use the temporal average of the receive signal relationship to calibrate of at least one of the plurality of receive paths. A corresponding method and corresponding computer program products usable during manufacture and operation are also disclosed.11-24-2011
20090209218GAIN IN BALANCE MEASURING APPARATUS, PHASE DIFFERENCE CORRESPONDING VALUE MEASURING APPARATUS, METHOD, PROGRAM, AND RECORDING MEDIUM - An object of the present invention is to increase measurement precision for measuring errors of a quadrature demodulator. An error measurement device 08-20-2009
20100248668POSITIONING RECEIVER AND POSITIONING METHOD FOR USER EQUIPMENT - A positioning receiver and a positioning method for user equipment in which errors in the position when the position of the user equipment is calculated can be reduced even in an environment in which the user equipment moves at high speed to improve the accuracy of the position. User equipment (UE) (09-30-2010
20100248667ENHANCED JAMMING DETECTION - Systems and methods are disclosed that include measuring power within at least one part of a wireless frequency band. These systems and methods also include calculating a variance, a mean, and a mean-to-variance ratio based upon the power measured in at least one part of the wireless frequency band using a processor. In addition, these systems and methods include comparing the mean, variance, and mean-to-variance ratio to known thresholds and determining if jamming is present within the at least one part of the wireless frequency band.09-30-2010
20120295563Satellite Signal Reception Device and Control Method for a Satellite Signal Reception Device - A satellite signal reception device has a reception unit that receives a satellite signal transmitted from a positioning information satellite, a reception state display device for displaying the satellite signal reception state, a reception state evaluation unit that determines the reception condition of the satellite signal received by the reception unit, and a display controller that controls the reception state display device to display the reception condition determined by the reception state evaluation unit. The reception state evaluation unit determines the level of the reception condition based on the number of positioning information satellites from which satellite signals are received and the signal level of each received signal, and the display controller controls the mechanical drive unit based on the reception level determining by the reception state evaluation unit to display the reception level using the time display device that displays the time.11-22-2012
20090170458Method and Receiver for Identifying a Leading Edge Time Period in a Received Radio Signal - A method for identifying a leading edge time period of a received radio signal includes identifying a greatest energy time period in a sequence of time periods. The received radio signal has a greatest average energy in the greatest energy time period. The method also includes identifying a least energy time period in the sequence of time periods. The received radio signal has a least average energy in the least energy time period. Further, the method includes setting a threshold energy based on the greatest average energy and the least average energy, determining a number of window time periods based on a characteristic of a radio channel used by the received radio signal, and identifying as a leading edge time period an earliest time period that precedes the greatest energy time period within the number of window time periods. The received radio signal in the leading edge time period has an average energy greater than or equal to the threshold energy.07-02-2009
20110201290BROADCAST RECEIVING APPARATUS AND METHOD OF DETERMINING PRESENCE OF NOISE 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 detector and a noise determining unit. The AM detector performs AM detection on an IF signal in airwaves received by a receiving antenna that receives incoming airwaves to acquire an AM detection signal. The AM noise detector detects noise components in the AM detection signal. The FM detector performs FM detection on the IF signal to acquire an FM detection signal. The FM noise detector detects noise components in the FM detection signal. The noise determining unit determines a noise status of a broadcast signal based on detection results acquired by the AM noise detector and the FM noise detector.08-18-2011
20120196552Methods for Determining Whether a Signal Includes a Wanted Signal and Apparatuses Configured to Determine Whether a Signal Includes a Wanted Signal - In various embodiments, a method for determining whether a signal includes a wanted signal may be provided. The method may include determining a frequency at which the signal has a signal energy above a first pre-defined signal energy threshold and determining whether the signal includes a wanted signal, based on whether the signal has a signal energy above a second pre-defined signal energy threshold in a pre-defined frequency range in a frequency neighborhood of the determined frequency.08-02-2012
20090163162DIRECT CONVERSION RECEIVING ARCHITECTURE WITH AN INTEGRATED TUNER SELF ALIGNMENT FUNCTION - A direct conversion receiver with an integrated self alignment tuner. The system includes a tank circuit, an analog to digital converter, a digital down converter, a digital up converter, a local oscillator, and a digital to analog converter. The tank circuit receives a radio frequency signal from an antenna input. The analog to digital converter is connected to the tank circuit to digitize the tank output signal and generate a corresponding digital signal. The digital down converter is in communication with the analog to digital converter and generates an intermediate frequency signal based on the digital signal and the output of the local oscillator. The digital up converter is in communication with the digital to analog converter to generate a radio frequency test signal, where the digital to analog converter provides the radio frequency test signal to the antenna input.06-25-2009
20090186589DETERMINATION OF ANTENNA NOISE TEMPERATURE FOR HANDHELD WIRELESS DEVICES - Antenna noise temperature is determined for a handheld wireless communication device which typically includes a radio, e.g. having a wireless transceiver and associated circuitry connected thereto, and an antenna connected to the radio. The method includes measuring an antenna thermal noise component, measuring a radio noise component, measuring an environmental background noise component, and determining the antenna noise temperature based upon the measured antenna thermal noise, radio noise, and environmental background noise components. The method may include measuring antenna efficiency, and determining further includes weighting at least one of the measured antenna thermal noise, radio noise and environmental background noise components based upon the measured antenna efficiency.07-23-2009
20090325526Method and apparatus for reporting state information - A method for reporting state information is provided. The receiver device receives a service, which is encoded in at least two layers over a communication channel, through a subset of said at least two layers; it measures a channel quality parameter; and in response to the channel quality parameter reaching a predetermined threshold value, it receives the service through a modified subset of the at least two layers as a function of the measured channel quality parameter and transmitting state information of the receiver device. Thus, the signal overhead is reduced.12-31-2009
20090221250METHODS AND APPARATUS FOR HANDLING A SIGNALING MESSAGE THE RELATES TO TRANSMISSION RATE RESTRICTIONS - A method for handling a signaling message that specifies transmission rate restrictions may include operating in a first state. The method may also include receiving the signaling message from a network. The signaling message may include an activation time, the transmission rate restrictions and the control duration. The method may also include receiving a state transition trigger to operate in a second state. The method may also include determining the user equipment's behavior regarding the transmission rate restrictions upon receiving the state transition trigger.09-03-2009
20110143700SIGNAL PROCESSING DEVICE AND METHOD FOR DETECTING AND LOCATING SPECTRAL SHAPES - Method and device for detecting a target spectrum and its frequency location in a scenario contaminated with strong jammers on other interferers. The detection is based on the geodesic distance between the correlation matrix (RD) of the received signal and the correlation matrix (RT) of the target spectrum (TS) which is assumed known in shape and bandwidth. The detection happens when the threshold (Formula (I)) is overcome. The frequency location is based on the minimization of the mean square error between RD and RT.06-16-2011
20120077452IP2 CALIBRATION METHODS AND TECHNIQUES - Some embodiments of the present disclosure relate to improved techniques for performing IP2 calibration in receivers having two complementary data paths (e.g., i-data path and q-data path). In these techniques, one of the two data paths (e.g., the i-data path) is used to generate a reference signal for the other data path (e.g., the q-data path), and/or vice versa. The other data path then performs calibration using the reference signal. Compared to previous techniques (which required separate, dedicated circuitry for generating a reference signal), the inventive techniques reduce the amount of circuitry and correspondingly reduce the manufacturing costs and power consumption. This is because the inventive techniques use the existing circuitry in complementary fashion during calibration (e.g., during calibration an i-data path generates a reference signal for a q-data path, and vice versa).03-29-2012
20120196551COMMUNICATION RECEIVER ENHANCEMENTS USING MULTI-SIGNAL CAPTURE - A method and apparatus is disclosed to determine communications receiver parameters from multiple channels of a received communications signal and to configure and/or adjust communications receiver parameters to acquire one or more channels from among the multiple channels of the received communications signal. A communications receiver observes a multi-channel communication signal as it passes through a communication channel. The communications receiver determines one or more communications receiver parameters from the multiple channels of the received communications signal. The communications receiver configures and/or adjusts communications receiver parameters to acquire the one or more channels from among the multiple channels of the received communications signal.08-02-2012
20100261446Apparatus and Method for Local Oscillator Calibration in Mixer Circuits - An apparatus and method for local oscillator calibration compensates for filter passband variation in a mixer circuit, such as a receiver circuit. The receiver includes at least a mixer circuit and a filter coupled to the output of the mixer. During operation, the mixer mixes an RF input signal with a first local oscillator (LO) signal to frequency translate a selected channel in the RF input signal into the passband of the filter. During a calibration mode, the RF input signal is disabled, and the first LO signal is injected into the filter input by leaking the first LO signal through the mixer circuit. The frequency of the LO signal is then swept over a frequency bandwidth that is sufficiently wide so that the actual passband is detected by measuring the signal amplitude at the output of the bandpass filter, thereby determining any variation in the passband of the filter from the expected passband. Once the actual passband is determined, then the frequency of the first local oscillator signal is adjusted or tuned to compensate for any frequency shift of the actual passband compared to the expected passband. Therefore, the selected channel is up-converted into the center of the actual passband of the bandpass filter and will not fall outside the passband. This enables the passband of the bandpass filter to be narrowed, as compared with conventional receivers that do not utilize this calibration procedure. For example, the bandpass filter can be narrowed to one or two channels wide.10-14-2010
20110059709Self-Optimizing Integrated RF Converter - Techniques are disclosed for optimization of RF converters. The techniques can be employed, for instance, in RF converters implemented in semiconductor materials (system-on-chip, or chip set) or with discrete components on a printed circuit board. In any such cases, the RF converter system can be configured with one or more actuators to adjust performance, one or more sensor to assess the performance (e.g., linearity of RF converter) and parameters of interest (e.g., ambient temperature, and a control block for controlling the sensors and actuators. The configuration allows the RF converter to autonomously self-optimize for linearity or other parameters of interest such as gain, noise figure, and dynamic range, across a broad range of variables.03-10-2011
20090075612EQUALIZATION OF THIRD-ORDER INTERMODULATION PRODUCTS IN WIDEBAND DIRECT CONVERSION RECEIVER - A feedforward error-compensated receiver for minimizing undesired odd-order nonlinear distortion products. The receiver includes a first receiver path configured to receive an input signal. The first receiver path outputs a signal including at least one baseband (BB) frequency. At least one second receiver path is configured to receive the input signal and to provide a second receiver path output signal. The second receiver path includes at least one odd-order nonlinear distortion reference generator. The at least one odd-order nonlinear distortion reference generator and the mixer are configured to generate a synthetic odd-order nonlinear distortion signal. A combining element is configured to receive the output signal from the first path and the output signal from the second receiver path output and to combine the signals such that the odd-order nonlinear distortion signals are substantially attenuated at an output of the combining element.03-19-2009
20100197259METHOD AND APPARATUS FOR PRODUCING SIGNAL USED FOR VERIFYING THE PERFORMANCE OF STANDARD RADIO RECEIVER - A method and an apparatus for producing a signal for verifying performances of a standard radio receiver. The apparatus includes a control module adaptable for controlling data processing, a program module for controlling and storing a digital simulation signal, a conversion module carrying out D/A conversion for the digital simulation signal, and a simulation module. When validating whether the standard radio receiver is compliant to IEEE 802.15.4-2006 standard, a verifier only needs to set up parameters defining types and signal strengths of a data frame w/o noise signals, time intervals for sending out the data frame, and a count of times of sending the data frame. Based on predefined parameters, the simulation module generates a digital simulation signal which is then processed by successive hardware devices to generate a simulated verification signal needed for validating the standard radio receiver.08-05-2010
20100197258ROBUST SIGNAL DETECTION USING CORRENTROPY08-05-2010
20090111411System and Method for Blind Estimation of Multiple Carrier Frequency Offsets and Separation of User Signals in Wireless Communications Systems - A system and method for blind estimation of carrier frequency offsets (CFOs) and separation of user signals in wireless communications systems are provided. Blind estimation of CFOs (i.e., without knowledge of the conditions of the transmitter or the transmission medium/channel) is carried out in order to improve reception quality by a wireless communications device. A received RF signal is over-sampled by a pre-defined over-sampling factor, and polyphase components are extracted from the over-sampled signal. The polyphase components are used to construct a virtual receiver output matrix, e.g., a model of the received signal and its associated output matrix. System response conditions are blindly estimated by applying a blind system estimation algorithm to the virtual receiver output matrix. A plurality of CFO estimates are obtained from the estimated system response conditions, and can be used by an equalizer to adjust receiver parameters in accordance with the CFO estimates so as to maximize reception quality and to extract multiple user signals from the received signal.04-30-2009
20100330942LINEARITY OF AN RF RECEIVE PATH BY SPURIOUS TONE SUPPRESSION - A method of increasing linearity of an RF signal receive path includes measuring a signal amplified by the receive path. The receive path has a local oscillator operating at an LO frequency and a ground. An error signal is determined from the amplified signal, the error signal being representative of the nonlinearity. An anti-spur tone is injected into the ground. The anti-spur tone has a frequency about equal to the LO frequency and an amplitude and phase that are determined to increase the linearity of the receive path.12-30-2010
20110244819ACTIVE ANTENNA ARRAY AND METHOD FOR CALIBRATION OF THE ACTIVE ANTENNA ARRAY - The disclosure relates to an active antenna array for a mobile communication system which comprises a plurality of receive paths, a control unit for generating a sounding signal, and a coupler for coupling the sounding signal into at least one of a plurality of receive paths. A switch is used to switch the output of one the plurality of receive paths between one of a receiver and a calibration unit.10-06-2011
20110034140Communication apparatus - A communication apparatus is provided that includes an apparatus main frame, an antenna, and a connecting element that connects the antenna to the apparatus main frame and positions the antenna away from the apparatus main frame.02-10-2011
20090247102CIRCUIT AND METHOD OF CALIBRATING DIRECT CURRENT OFFSET IN WIRELESS COMMUNICATION DEVICE - A circuit for calibrating the DC offset in a wireless communication device utilizes a voltage-generating circuit to generate a first voltage value and its negative value, and utilizes a detecting circuit to detect an output of the wireless communication device and generate a first target-branch reference value corresponding to the power of the output when the first voltage value is inputted into a target branch (e.g., the in-phase branch or the quadrature branch) of the wireless communication device, and detect an output of the wireless communication device and generate a second target-branch reference value corresponding to the power of the output when the negative value of the first voltage value is input into the target branch. Then, an estimating circuit estimates the DC offset on the target branch according to the first and second target-branch reference values and the first voltage value.10-01-2009
20090047920METHODS FOR DETECTING AND CLASSIFYING SIGNALS TRANSMITTED OVER A RADIO FREQUENCY SPECTRUM - A method for classifying a signal is disclosed. The method can be used by a station or stations within a network to classify the signal as non-cooperative (NC) or a target signal. The method performs classification over channels within a frequency spectrum. The percentage of power above a first threshold is computed for a channel. Based on the percentage, a signal is classified as a narrowband signal. If the percentage indicates the absence of a narrowband signal, then a lower second threshold is applied to confirm the absence according to the percentage of power above the second threshold. The signal is classified as a narrowband signal or pre-classified as a wideband signal based on the percentage. Pre-classified wideband signals are classified as a wideband NC signal or target signal using spectrum masks.02-19-2009
20100062735HANDHELD APPARATUS AND METHOD FOR DETERMINING THE RELIABILITY OF A NETWORK CONNECTION AT A SITE - A method includes receiving wireless signals from a wireless network at a handheld device located at a specified site. The wireless signals are associated with a network connection at the specified site. The method also includes determining one or more metrics related to a reliability of the network connection at the specified site. In addition, the method includes determining that a class of application or device is supported by the network connection using the one or more metrics. The one or more metrics could include signal strength, bandwidth, latency, average number of channels available, number of routing elements visible, and/or average latency. Determining that the class of application or device is supported by the network connection could include determining that each of the one or more metrics is suitable for the class of application or device based on a criticality of the class of application or device.03-11-2010
20100056091DEVICE AND METHOD FOR REDUCING LEAKAGE SIGNAL - The present invention relates to a leakage signal reducing device and method. The present invention uses a signal with varied phase and gain output by a local oscillator to eliminate a leakage signal leaked by a local oscillator to a frequency converter.03-04-2010
20110076975METHOD AND APPARATUS FOR WIRELESS LOCATION MEASUREMENT - A wireless location measurement method of a receiver includes: receiving signals from a transmitter for a plurality of time intervals; extracting a final propagation delay tab profile based on a plurality of signals that are received for the plurality of time intervals; and calculating a distance between the transmitter and the receiver by using the final propagation tab delay profile. A wireless location measurement apparatus includes: a receiver for receiving signals from a transmitter for a plurality of time intervals; an accumulator for accumulating the plurality of signals and outputting an accumulated signal; a propagation delay tab extractor for extracting a propagation delay tab profile of the accumulated signal; and a location measurer for measuring a location by using the propagation delay tab profile.03-31-2011
20110151815SYSTEM AND METHOD FOR IDENTIFYING GAUSSIAN RADIO NOISE - Provided is a system and method of identifying Gaussian radio noise. The Gaussian radio noise identifying system may determine whether measured data of radio noise indicates a Gaussian distribution. The Gaussian radio noise identifying system may determine whether the measured data indicates the Gaussian distribution through a matching test consisting of two operations. The operations may include a matching test between an average estimate value of measured and a ½, and a matching test between a standard deviation estimate value and a result value obtained by dividing an H-range by a predetermined value. Accordingly, it is possible to enhance a determination accuracy.06-23-2011
20110021167METHODS AND APPARATUS FOR SPECTRUM SENSING OF SIGNAL FEATURES IN A WIRELESS CHANNEL - Methods and apparatus for sensing features of a signal in a wireless communication system are disclosed. The disclosed methods and apparatus sense signal features by determining a number of spectral density estimates, where each estimate is derived based on reception of the signal by a respective antenna in a system with multiple sensing antennas. The spectral density estimates are then combined, and the signal features are sensed based on the combination of the spectral density estimates.01-27-2011
20110053539RADIO ENVIRONMENT SCANNER - A device may include a measurement receiver, a communication receiver, and a transmitter. The measurement receiver may include a receiver (RX) down-conversion component to receive an amplified signal from a low-noise amplifier of the communication receiver, selectively receive a signal from a first local oscillator associated with the communication receiver or a second local oscillator associated with the transmitter, and down-convert the amplified signal to baseband using the received signal from the first local oscillator or the second local oscillator. The measurement receiver may further include a delta-sigma analog-to-digital converter (ADC) to provide low quantization noise only for a particular frequency range to be measured, and a control component to configure the delta-sigma ADC to provide the low quantization noise at the particular frequency range.03-03-2011
20110053538 HIGH SPEED FREQUENCY DETECTOR03-03-2011
20100285765SIGNAL ANALYSIS FOR AN IMPROVED DETECTION OF NOISE FROM AN ADJACENT CHANNEL - A radio receiver may determine whether a received frequency modulated radio signal includes interference from an adjacent channel. The receiver may compare a frequency deviation above the center frequency of the received signal to a frequency deviation below the center frequency of the received signal. The receiver determines that the radio signal is affected by adjacent channel noise when the frequency deviation below the center frequency is substantially different from the frequency deviation above the center frequency. Alternatively, the presence of noise from an adjacent channel may be detected by comparing a positive amplitude and a negative amplitude of a demodulated version of the frequency modulated radio signal. In this alternative, the receiver determines that the radio signal is affected by adjacent channel noise when the extent of the positive amplitude is substantially different from the extent of the negative amplitude.11-11-2010
20110136457SYSTEM AND METHOD FOR THE WIRELESS TERMINAL RECEIVING SENSITIVITY PERFORMANCE TEST BASED ON DATA MODE - A method and system for the wireless terminal receiving sensitivity performance test based on a data mode are provided. The method comprises: building a human body model, in which the upper limb of the model holds the device under test at a predefined distance in front of the head of the model; taking the antenna of the device under test as the origin to build a spherical coordinate and selecting a testing point in the spherical coordinate; placing the model under the circumstance of a full-anechoic chamber; enabling the device under test to work in a data mode, and collecting the receiving power at the testing point in the spherical placement system using the testing antenna, so as to obtain the total power receiving sensitivity of the device under test. In this way, the performance influence on the mobile terminal from the human body coupling of the human being in a data mode can be actually reflected, the reality is high and the usage is easy.06-09-2011
20110136456SYSTEM AND METHOD FOR SIGNAL DETECTION USING A DYNAMIC THRESHOLD - Systems and methods for signal detection are disclosed. In one embodiment, detection of a signal is performed using a dynamic threshold selected based at least in part on the determination that a value based on a previously received signal is between a first and a second threshold. In another embodiment, detection of a signal is performed using a dynamic threshold selected based at least in part on a charging condition.06-09-2011
20120178393RECEIVING APPARATUS AND INTERFERENCE POWER ESTIMATION METHOD - Provided are a receiving apparatus and an interference power estimation method that can perform interference power estimation with high accuracy even when correlation in a fading variation between reference signals is low and obtain accurate receiving quality. The interference power estimation method according to the present invention receives a plurality of discontinuous reference signals on the time/frequency plane, extracts the reference signals from the received signal, linear-combines channel variation values obtained from reference signals surrounding a reference signal of a specific time/frequency on the time/frequency plane with predetermined weighting and estimates interference power using the linear-combined value resulting from the linear combining.07-12-2012
20110306315Quick Detection of signaling in a Wireless Communication System - Quick frequency tracking (QFT), quick time tracking (QTT), and non-causal pilot filtering (NCP) are used to detect sporadically transmitted signaling, e.g., paging indicators. For QFT, multiple hypothesized frequency errors are applied to an input signal to obtain multiple rotated signals. The energies of the rotated signals are computed. The hypothesized frequency error with the largest energy is provided as a frequency error estimate. For QTT, coherent accumulation is performed on the input signal for a first set of time offsets, e.g., early, on-time, and late. Interpolation, energy computation, and non-coherent accumulation are then performed to obtain a timing error estimate with higher time resolution. For NCP, pilot symbols are filtered with a non-causal filter to obtain pilot estimates for one antenna for non-STTD and for two antennas for STTD. The frequency and timing error estimates and the pilot estimates are used to detect the signaling.12-15-2011
20110306314FREQUENCY-SCALABLE SHOCKLINE-BASED VNA - A high-frequency VNA system is provided using non-linear transmission line (NLTL or shockline) based samplers configured to provide scalable operation characteristics. Scaling to adjust noise performance vs. frequency is accomplished as follows: (1) increasing or decreasing the fall time of a shockline's output voltage waveform. This is accomplished by changing the number of Schottky varactors in a shockline, as well as changing the shockline's Bragg cutoff frequency by setting the spacing between Schottky varactors; (2) changing the structure of the pulse-forming network connected with the sampler by changing the length of the differentiator arms in the sampler pulse-forming network; and (3) changing the LO signal frequency applied to the shockline. Multiple NLTL based samplers are multiplexed to form a broadband reflectometer with the multiplexing circuitry selectively connecting one of the NLTL based sampler segments at a time to allow user selection of a desired performance vs. frequency response for each segment.12-15-2011
20110319043Signal Degradation Detection - Implementations are directed to predicting signal degradation at receivers used to display a programming service. The receivers capture signal strength data that is then transmitted to a processing location, which may be associated with a provider of the programming service. A signal degradation detector at the provider operates to predict whether or not a future unacceptable signal quality will occur within a time interval. The prediction may be based on a test quantity calculated from signals captured at the receiver and based on a figure of merit for the geographic locale in which the receiver is located. A maintenance call may be initiated for those receivers that have such a poor signal quality.12-29-2011
20120003948Quadratic Amplitude Control Circuit For Cosite Interference Cancellation - A quadratic amplitude matching system and associated method with an associated tuning control system is provided for continuously and automatically tuning a quadratic amplitude matching filter (QAMF) to a band center of an interfering signal to provide improved rejection of an interfering signal coupled from a transmission antenna into a local receive antenna in the presence of local multi-path, thereby providing improved interference cancellation system performance. The matching control system is provided as an element of an interference cancellation system.01-05-2012
20100144299DISCONTINUOUS RECEPTION/TRANSMISSION FOR MOBILE COMMUNICATION SYSTEM - The present invention provides for a method of controlling discontinuous reception cycles in a mobile radio communications device, and discontinuous transmission cycles in a mobile radio communication network device, and comprising the steps of monitoring the number of consecutive discontinuous reception and transmission periods within which no data is received, monitoring the number of consecutive discontinuous reception and transmission periods within which data is received, and varying the said discontinuous reception cycle responsive to the result of said monitoring.06-10-2010
20110165851SIGNAL DETECTION APPARATUS AND SIGNAL DETECTION METHOD FOR USE IN RADIO STATION OF RADIO COMMUNICATION SYSTEM - A signal detection apparatus 07-07-2011
20120115427RECEIVER AND METHOD FOR REDUCING AN AMOUNT OF CHANNEL STATE INFORMATION FEEDBACK TO A TRANSMITTER - A receiver and a method are described herein for reducing an amount of channel state information related to a transmit channel correlation matrix φ05-10-2012
20090088111Method and system for detecting carrier wave dropout - The present invention is directed to a method and a system for detecting carrier dropout.04-02-2009
20120157027METHOD AND SYSTEM FOR CHARACTERIZING A RADIO CHANNEL OF A WIRELESS NETWORK USING VARIABILITY OF SYNCHRONIZATION - A speed parameter or channel quality parameter are determined in a mobile device based on variation in frequency offset measurement. A higher variation in the frequency offset measurement reflects a poorer channel quality and a higher speed; a lower variation in the frequency offset measurement reflects a better channel quality and a lower speed. The parameter(s) may be fed back to the system and used, for example, to make adaptive modulation and coding decisions.06-21-2012
20110105069SYSTEMS, METHODS AND APPARATUS FOR FACILITATING DISCONTINUOUS RECEPTION - Systems, methods and apparatus for facilitating discontinuous reception are provided. An example of a first method can include providing one or more discontinuous reception cycles respectively corresponding to one or more inactivity periods. During respective awake periods of the one or more discontinuous reception cycles, data can be received on respective ones of one or more frequency carriers. The number and type of the one or more frequency carriers on which data is received can be determined based on the one or more inactivity periods. Further, in some embodiments, in addition to providing discontinuous reception on selected frequency carriers, data can be received according to continuous reception on other frequency carriers, such as the anchor carrier.05-05-2011
20100093299ANALOG SIGNAL PROCESSOR IN A MULTI-GIGABIT RECEIVER SYSTEM - An analog multi-gigabit receiver and/or transceiver can be implemented for the reception and demodulation of multi-gigabits quadrature phase shift keying (QPSK) modulated using a CMOS (complementary metal-oxide semiconductor) process. Further, an analog multi-gigabit receiver and/or transceiver can be implemented for the reception and demodulation of multi-gigabits binary phase shift keying (BPSK), minimum shift keying (MSK), and/or amplitude shift keying (ASK) signal modulated in CMOS processes.04-15-2010
20100093298ADAPTIVE IIP2 CALIBRATION - A radio frequency transceiver (04-15-2010
20130012149Adaptive Real-time Control System for Transceiver Level and Gain Regulation - Adaptive gain regulation is performed by measuring one or more real-time closed-loop statistics for a signal output from a gain-controllable circuit and blindly adjusting the gain of the gain-controllable circuit based on the one or more real-time closed-loop statistics measured for the signal so that the signal output by the gain-controllable circuit satisfies a predetermined criteria without using a priori information about the signal.01-10-2013
20120220251COMPUTER-READABLE STORAGE MEDIUM HAVING STORED THEREIN INFORMATION PROCESSING PROGRAM, INFORMATION PROCESSOR, INFORMATION PROCESSING SYSTEM, AND INFORMATION PROCESSING METHOD - A game apparatus receives signals from a plurality of game apparatuses. When the game apparatus has received signals from the plurality of game apparatuses, the game apparatus sorts the signals by apparatus and calculates an average RSSI value of the signals for each of the respective apparatuses. The game apparatus further calculates an average value of the calculated average RSSI values of the respective apparatuses. Then, the game apparatus determines a single icon to be displayed based on the calculated average value and causes the icon to be displayed on a screen.08-30-2012
20100173598METHOD AND SYSTEM FOR FILTER CALIBRATION USING FRACTIONAL-N FREQUENCY SYNTHESIZED SIGNALS - A method and system for filter calibration using fractional-N frequency synthesized signals are presented. Aspects of the method may include generating an LO signal by a PLL circuit within a chip. A reference signal may be generated based on the generated LO signal and a synthesizer control signal. A frequency response for a filter circuit integrated within the chip may be calibrated by adjusting parameters associated with the filter circuit based on the generated LO signal. Aspects of the system may include a single-chip multi-band RF receiver that enables generation of a LO signal by a PLL circuit within the single-chip, and enables calibration of a frequency response for a filter circuit integrated within the chip. A reference signal may be generated based on the generated LO signal and a synthesizer control signal. The frequency response may be calibrated by adjusting the filter based on the generated reference signal.07-08-2010
20110003570CHANNEL DETERMINATION APPARATUS AND METHOD OF BROADCAST RECEIVER - A channel determination apparatus and method for a broadcast receiver are provided. The method includes estimating, when the broadcast receiver operates in a sleep state over a preset time period, inter-modulation distortion interference of a plurality of channels by scanning the channels, and receiving, when the sleep state is transitioned to an active state, broadcast data on a channel having the least inter-modulation distortion interference. Accordingly, the inter-modulation distortion interference of individual channels is taken into account to select an optimum channel, thereby resulting in improvement of channel determination accuracy.01-06-2011
20090239489Receiver configurable in a plurality of modes - Methods and corresponding systems for receiving a radio frequency signal include a receiver capable of switching operating modes and operable to receive the radio frequency signal in any of the operating modes. A metric monitor is coupled to the receiver and operable to provide a metric. A controller is responsive to the metric and operable to switch the receiver between the operating modes. The operating modes can include a zero intermediate frequency (ZIF) mode and a very low intermediate frequency (VLIF) mode. The metric can include a received signal strength indicator (RSSI) and an adjacent channel indicator. The receiver can be configured to operate in the ZIF mode in response to the RSSI value satisfying a threshold and configured to operate in the VLIF mode in response to the RSSI value failing to satisfy the threshold.09-24-2009
20110237214METHOD AND SYSTEM FOR ESTIMATING A RECEIVER FREQUENCY OFFSET IN A COMMUNICATION SYSTEM - A mobile device receives a radio frequency (RF) signal, comprising a physical signal such as a primary synchronization signal (PSS), from a serving base station. Two successive samples derived from the received physical signal such as a PSS are selected to generate a single phasor. A receiver frequency offset for the received RF signal is estimated utilizing the generated single phasor. A correlation process is performed to detect the received PSS. An angular increment in the first quadrant is calculated utilizing the generated single phasor. An actual angular increment subject to the receiver frequency offset is calculated based on the angular increment in the first quadrant and signs of real and imaginary components of the generated single phasor. The receiver frequency offset is determined based on the calculated actual angular increment and is utilized to adjust a reference or local oscillator frequency of the mobile device.09-29-2011
20120276863AUTOMATIC GAIN CONTROL IN A WIRELESS COMMUNICATION NETWORK - Techniques for performing automatic gain control (AGC) at a terminal in a wireless communication network are described. In an aspect, the terminal may use different receiver gain settings to receive different types of signals in different time intervals. The terminal may determine a receiver gain setting for each signal type and may use the receiver gain setting to receive signals of that signal type. In another aspect, the terminal may determine a receiver gain setting for a future time interval based on received power levels for peer terminals expected to transmit in that time interval. The terminal may measure received power levels of signals received from a plurality of terminals. The terminal may determine a set of terminals expected to transmit in the future time interval and may determine the receiver gain setting for the future time interval based on the measured received power levels.11-01-2012
20110287729WIRELESS COMMUNICATION RECEIVER HAVING ONE SIGNAL PROCESSING CIRCUIT WHOSE OPERATION MODE IS ADJUSTED BY MONITORING SIGNAL LEVEL OF SPECIFIC SIGNAL OF PRECEDING SIGNAL PROCESSING CIRCUIT AND RELATED WIRELESS COMMUNICATION METHOD - A wireless communication receiver includes a first signal processing circuit, a second signal processing circuit, and a detecting circuit. The first signal processing circuit generates a first processed signal by processing a received radio frequency (RF) signal. The second signal processing circuit is coupled to the first signal processing circuit. The detecting circuit monitors a specific signal of the first signal processing circuit and generates at least a control signal to the second signal processing circuit in response to a signal level of the monitored specific signal. The control signal controls the second signal processing circuit to switch from a first operation mode to a second operation mode.11-24-2011
20120100820METHOD FOR MEASURING VARIABLE BANDWIDTH WIRELESS CHANNEL AND TRANSMITTER AND RECEIVER THEREFOR - Provided are a method for measuring a variable bandwidth wireless channel, and a transmitter and a receiver therefor. The transmitter, includes: a pre-processing unit for performing variable over-sampling and band-limited filtering on an original sequence for measuring the wireless channel according to a pre-determined digital-to-analog (D/A) operation speed and measurement bandwidth, and creating and storing a probing sequence whose frequency is up-converted into a fixed transmitting intermediate frequency; and a real-time processing unit for transmitting a probing signal that the stored probing sequence is converted according to the D/A operation speed to the wireless channel.04-26-2012
20100178892Apparatus and Method for Reception Control07-15-2010
20100178891METHOD AND CIRCUIT FOR CALIBRATING ANALOG CIRCUIT COMPONENTS - A method for calibrating an analog circuit component comprises the steps of: generating a first signal with a baseband frequency; generating a second signal by processing the first signal via the analog component to be calibrated; generating a third signal by processing the second signal via a power amplifier, wherein the power amplifier operates in a nonlinear region; generating a fourth signal by processing the third signal via a low-pass filter; and defining the adjustment for the In-phase-Quadrature-phase imbalance (IQ imbalance) of the analog component and then re-executing the step of generating the first signal, if the fourth signal shows an IQ imbalance mismatch.07-15-2010
20100167674INTEGRATED CIRCUIT, WIRELESS COMMUNICATION UNIT AND METHOD FOR DETERMINING QUADRATURE IMBALANCE - An integrated circuit comprising processing logic for operably coupling to radio frequency (RF) receiver circuitry arranged to receive a wireless network signal. The receiver circuitry generates in-phase and quadrature digital baseband representations of the wireless network signal. The processing logic determines quadrature (I/Q) imbalance of the RF receiver circuitry based on the in-phase and quadrature digital baseband representations of the wireless network signal.07-01-2010
20100130150SWITCHED BEAM ANTENNA WITH DIGITALLY CONTROLLED WEIGHTED RADIO FREQUENCY COMBINING - A wireless communication system, wherein a sub-set of radio frequency signals received from corresponding antenna elements is selected and combined into a single radio frequency signal, the single radio frequency signal being processed and demodulated in a single processing chain, includes a radio frequency phasing network for co-phasing the selected radio frequency signals before combining and a processor for controlling combining and phasing in order to obtain a single radio frequency signal having a radio performance indicator which satisfies predetermined conditions.05-27-2010
20130017797SELECTIVE RECEIVE DIVERSITY IN A MOBILE WIRELESS DEVICEAANM Ramasamy; VenkatasubramanianAACI San JoseAAST CAAACO USAAGP Ramasamy; Venkatasubramanian San Jose CA USAANM Nukala; Gaurav R.AACI SunnyvaleAAST CAAACO USAAGP Nukala; Gaurav R. Sunnyvale CA US - Method, apparatus and computer program product measuring signals received through multiple antennas in a mobile wireless device is described. Signals received through at least one of a primary antenna and a secondary antenna, during each cycle in a series of discontinuous reception cycles, is measured. The mobile wireless device switches between the primary and secondary antennas based on comparing the moving averages of the measured received signals to pre-determined thresholds. When unable to decode successfully a signal received on the primary antenna, the mobile wireless device switches to decode signals received on the secondary antenna.01-17-2013
20110159830RECEIVER - A receiver (06-30-2011
20080227420Multipoint Voltage and Current Probe System - A metrology system monitors radio frequency (RF) power at a plurality of locations in a circuit. The system includes a plurality of RF sensors that generate respective analog signals based on electrical properties of the RF power, a multiplexing module that generates an output signal based on the analog signals, and an analysis module that generates messages based on the output signal. The messages contain information regarding the electrical properties that are sensed by the plurality of RF sensors.09-18-2008
20130178181Communication Device Comprising Two or More Antennas - The present invention provides an electronic device adapted for performing a wireless communication for a transmission of data. The device comprises at least a first antenna having a first antenna feed point and a second antenna having a second antenna feed point, The antennas are adapted to transmit and receive electromagnetic signals for providing the wireless communication using a multiple antenna communication scheme.07-11-2013
20130143508Receiving Circuit, Method for Receiving a Signal, and Use of a Detection Circuit and a Control Circuit - A receiving circuit, method for receiving a signal, and use of a detection circuit and a control circuit of a receiving circuit of a node of a radio network is provided to deactivate an analog signal processing and/or determination of digital data from a signal received over an antenna of the node, when a stored current frame of the digital data has been recognized as valid, and to activate the analog signal processing and/or the determination, when the transmission of the current frame over an interface of the control circuit has been confirmed, whereby the control circuit is connected to the detection circuit and/or an input circuit for deactivation and activation, and whereby the detection circuit is formed to determine the digital data from the received signal.06-06-2013
20120252390SYSTEM AND METHODS FOR DETERMINING RADIATED RADIO FREQUENCY (RF) RECEIVER SENSITIVITY - A test method is for determining RF sensitivity of an RF receiver for a plurality of channels extending over a frequency band(s) using an RF source coupled to the RF receiver by an RF communications link. The plurality of channels may include channels having a predictable RF sensitivity and a channel(s) having a non-predictable RF sensitivity. The test method may include measuring an RF sensitivity for one or more of the channels having the predictable RF sensitivity, and generating a partial RF sensitivity function for the channels having the predictable RF sensitivity based thereon. The method may further include measuring an RF sensitivity for the channel(s) having the non-predictable RF sensitivity. Additionally, an overall RF sensitivity function may be generated for the plurality of channels based upon the partial RF sensitivity function, and based upon the measured RF sensitivity for the channel(s) having the non-predictable RF sensitivity.10-04-2012
20130130635Method of Receiving and Receivers - Data is received that has been transmitted via a combination of radio frequency signals using carrier aggregation, each radio frequency signal occupying a respective radio frequency band, the bands being arranged in two groups separated in frequency by a first frequency region, the first of the two groups occupying a wider frequency region than the second group. Embodiments provide a method and apparatus for downcoverting the radio frequency signals using quadrature mixing to give inphase and quadrature components, and the inphase and quadrature components are filtered using a first bandpass filter bandwidth to give first bandpass filtered inphase and quadrature components and filtered using a second bandpass filter bandwidth, different from the first bandpass filter bandwidth, to give second bandpass filtered inphase and quadrature components.05-23-2013
20100279638Adaptive Idle Mode Measurement Methods and Apparatus - Methods and apparatus in a receiver for selecting among methods of estimating a received power of at least one signal based on whether inter-frequency or inter-radio-access-technology received power measurements are needed. A method includes using a first method of measuring the received power based on the pattern to generate a first power estimate based on a first duration of the at least one signal; comparing the first power estimate to a first threshold; and based on the comparing, either using the first method of measuring to generate another first power estimate or using a second method of measuring the received power based on the pattern to generate a second power estimate, the second method being different from the first method and the second power estimate being based on a second duration of the at least one signal, and measuring a received power of at least one signal having a second carrier frequency.11-04-2010
20130157600METHOD AND APPARATUS FOR DETECTING RADIO SIGNAL - A method for detecting a radio signal in a wireless communication system is provided. According to the method, a wireless device measures an input signal received by a RF unit of. The wireless device eliminates a duplicated part between the input signal and a complex conjugate signal of the input signal to generate a filtered signal. The wireless device determines whether a target signal exists in the input signal based on the filtered signal.06-20-2013
20130157601POLARIZATION CONTROL DEVICE, INTEGRATED CIRCUIT AND METHOD FOR COMPENSATING PHASE MISMATCH - A polarization control device (06-20-2013
20130122840METHOD FOR MEASURING INTER-FREQUENCY - According to an embodiment of the present invention, a method is provided for measuring inter-frequency in a receiver including a plurality of reception antennas. The method may comprise the steps of: performing a service using a first frequency through a first antenna and/or a second antenna; measuring a second frequency using the first antenna while the service continues to be performed using the first frequency through the second antenna; and estimating the measurement result without the second frequency being practically measured through the second antenna by using the measurement result of the second frequency through the first antenna.05-16-2013
20110312292METHOD AND SYSTEM FOR MEASURING RECEIVER MIXER IQ MISMATCH - A system for correcting a mismatch between an in-phase path and a quadrature path in a receiver, the system including one or more processors operable to correlate a received signal with a complex training sequence having periodic, uncorrelated real and imaginary components, thereby generating a complex correlation. The one or more processors estimate a gain mismatch and a phase mismatch based on the complex correlation over a unit period. The one or more processors control a first receive filter in the in-phase path via a first digital-to-analog controller, and control a second receive filter in the quadrature path via a second digital-to-analog controller. The cutoff frequency and bandwidth of the first receive filter is controlled independently of the second receive filter to enable the output of the first receive filter and the output of the second receive filter to be tightly matched.12-22-2011
20110312291Frequency Modulated Broadcasts - A method comprises detecting whether or not a frequency modulation broadcast receiver is tuned to an overdeviated frequency modulated broadcast, or is at a location where overdeviated frequency modulated broadcasts exist or has received a user input indicating the presence of an overdeviated frequency modulated broadcast; and in response to the detection, automatically adjusting operation of the frequency modulated broadcast receiver. Automatically adjusting operation comprises adjusting one or more parameters or settings in such a way as to alter the susceptibility of a speaker arrangement to the possibility of being overdriven by overdeviated frequency modulated broadcasts.12-22-2011
20120021710ELECTROMAGNETIC WAVE DISCRIMINATION DEVICE, ELECTROMAGNETIC WAVE DISCRIMINATION METHOD, AND ELECTROMAGNETIC WAVE DISCRIMINATION PROGRAM - An electromagnetic wave discrimination device according to the present invention discriminates electromagnetic waves, and includes an acquisition section, a feature quantity calculation section, a similarity calculation section, a classification section, a discrimination section, an output section, and a storage section. The acquisition section receives communication signals of a predetermined frequency, and samples waveform data of the communication signals every predetermined time to obtain sample data for each predetermined time. The feature quantity calculation section calculates amplitude feature quantities for each predetermined time, based on the sampling data for each predetermined time. The similarity calculation section calculates degrees of similarity with respect to the amplitude feature quantities for each predetermined time. The classification section classifies the communication signals for each predetermined time into clusters to obtain cluster analysis results of the communication signals for each predetermined time, based on the degrees of similarity. The discrimination section discriminates communication signals constituting one cluster for each of the clusters to obtain discrimination results, based on the cluster analysis results of the communication signals for each predetermined time. The output section outputs the discrimination results. The storage section stores the amplitude feature quantities, the degrees of similarity, the cluster analysis results, and the discrimination results.01-26-2012
20120083232ACTIVE ANTENNA SYSTEM AND METHOD FOR OPERATION OF AN ACTIVE ANTENNA ARRAY - The application relates to a method for operation of an active antenna array and to an active antenna system. The active antenna system has a signal processing unit and an active antenna array adapted to be operated with a main antenna pattern correlated to a main receive beam and with at least one test antenna pattern correlated to a test receive beam having an orientation different from the main receive beam. A main radio frequency signal is received based on the main antenna pattern and a test radio frequency signal is received based on the test antenna pattern. The main radio frequency signal comprises communications traffic. Performance of the main receive beam is assessed based on the main radio frequency signal and performance of the test receive beam is assessed based on the test radio frequency signal. The main antenna pattern is adjusted based on a comparison of the performance of the main receive beam and test receive beam.04-05-2012

Patent applications in class Measuring or testing of receiver

Patent applications in all subclasses Measuring or testing of receiver