Testing Patents (Class 375/224)
  • Publication number: 20140314132
    Abstract: A transmission arrangement is disclosed having an amplifier which is set up to amplify a transmission signal and to provide it as an amplified transmission signal in differential form, an analysis circuit for determining a property of the amplified transmission signal, and a differential feedback path which is set up to supply the amplified transmission signal to the analysis circuit in differential form.
    Type: Application
    Filed: February 19, 2014
    Publication date: October 23, 2014
    Inventors: Stephan Leuschner, Florian Mrugalla, José Moreira, Peter Pfann
  • Patent number: 8867594
    Abstract: A non-liner device (NLD) between powerline communication (PLC) devices can introduce significant distortion into the channel being utilized by the PLC devices. This distortion can create errors and corrupt data transmitted by the PLC devices. When trying to mitigate the effects of the distortion introduced by NLDs, PLC devices conform their mitigating actions to effectively satisfy a limit(s) set by a regulation and/or a standard. A PLC device implemented in accordance with this disclosure can mitigate the distortion effects with deference to regulatory/standard limits without knowledge of what types of NLDs and how many NLDs are coupled to the power line. A PLC device can use different techniques to infer the presence of an NLD in a PLC network. A PLC device can infer the presence of the NLD using a passive technique or one or more active techniques.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: October 21, 2014
    Assignee: Qualcomm Incorporated
    Inventors: Faisal Mahmood Shad, Lawrence Winston Yonge, III
  • Patent number: 8867930
    Abstract: Systems and methods for determining the envelope of a modulated signal using high bandwidth and low bandwidth samples of a hybrid signal. The hybrid signal is obtained by mixing the modulated signal with its carrier signal. The systems and methods of the present disclosure may be suitable for equivalent-time or real-time oscilloscopes.
    Type: Grant
    Filed: October 27, 2011
    Date of Patent: October 21, 2014
    Assignee: Queen's University at Kingston
    Inventors: David J. Krause, John C. Cartledge
  • Patent number: 8867595
    Abstract: A signal on a transmitter tracks noise on a ground node in a manner decoupled from a positive node of a power supply. The signal is transmitted from the transmitter to the receiver. A reference voltage is generated on the receiver to track noise on a ground node in the receiver. Consequently, the received signal and the reference voltage have substantially the same noise characteristics, which become common mode noise that can be cancelled out when these two signals are compared against each other. In a further embodiment, the reference voltage is compared against a predetermined calibration pattern. An error signal is generated based on a difference between the sampler output and the predetermined calibration pattern. The error signal is then used to adjust the reference voltage so that the DC level of the reference voltage is positioned substantially in the middle of the received signal.
    Type: Grant
    Filed: June 10, 2013
    Date of Patent: October 21, 2014
    Assignee: Rambus Inc.
    Inventors: Lei Luo, Barry W. Daly, Kambiz Kaviani, John Cronan Eble, III, John Wilson
  • Patent number: 8867634
    Abstract: Methods and apparatuses for OFDM spectrum sensing are provided. The proposed spectrum sensing algorithms are based on Time-Domain Symbol Cross-Correlation (TDSC-MRC and TDSC-NP methods) and can be applied to all existing wireless OFDM systems. The statistical behaviors of the TDSC-based spectrum sensors are explicitly analyzed. In addition, the spectrum sensing method employing the Cyclic Prefix of the OFDM modulated signals (CP method) is described for comparison purposes. The DVB-T Standard is adopted as an application example to illustrate the proposed spectrum sensing algorithms. Simulation results show that the TDSC-MRC method outperforms the CP method for all values of CP ratio considered. The TDSC methods have the advantage that the detection performances are the same for different CP ratios, while the detection performance of the CP method degrades dramatically when the CP ratio becomes small.
    Type: Grant
    Filed: March 12, 2010
    Date of Patent: October 21, 2014
    Assignee: Thomson Licensing
    Inventors: Hou-Shin Chen, Wen Gao
  • Patent number: 8867643
    Abstract: Four (=M) transmission information signals are output from transmission information generating unit to linear transform unit, where they are transformed into synthesis signals by linear transform expressed by multiplication by a 2×4 matrix having complex numbers as elements. Signal processors perform signal processing corresponding to the modulation technique of test target on synthesis signals. On the resultant signals, 2×2 channel processing unit performs 2×2 pseudo channel processing, thereby forming equivalent M×N channels. Parameter setting unit sets information necessary to acquire desired M×N channel characteristics as the synthesis characteristics of linear transform unit and N×N channel processing unit.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: October 21, 2014
    Assignee: Anritsu Corporation
    Inventors: Takeshi Kobayashi, Kazunori Kitagawa, Masaki Hizume
  • Patent number: 8866508
    Abstract: A system and method is disclosed for adaptively adjusting a driving strength of a signal between a first and second chip in a 3D architecture/stack. This may be used to adaptively calibrate a chip in a 3D architecture/stack. The system may include a transmission circuit on one chip and a receiver circuit on another chip. Alternatively, the system may include a transmission and receiver circuit on just one chip.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: October 21, 2014
    Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
    Inventors: Ying-Yu Hsu, Ruey-Bin Sheen, Chih-Hsien Chang
  • Patent number: 8867599
    Abstract: Transmissions from mid-bus test equipment to a first device and from a second device to the mid-bus test equipment are equalized. Equalization instructions are passed from the first device through the mid-bus test equipment to the second device. The mid-bus test equipment changes the quality of transmissions sent to the first device in order to steer the first device to produce equalization instructions that will produce optimized transmissions from the mid-bus test equipment to the first device and from the second device to the mid-bus test equipment.
    Type: Grant
    Filed: February 11, 2013
    Date of Patent: October 21, 2014
    Assignee: SerialTek, LLC
    Inventors: Dale T Smith, Eric J Lanning
  • Patent number: 8867712
    Abstract: A method and a device adjust a power allocation of users in a digital subscriber line environment. An intermediate power allocation is determined for at least one user initializing with the digital subscriber line environment based on a new power allocation determined for the digital subscriber line environment containing the at least one user. The intermediate power allocation provides a predefined minimum signal-to-noise ratio margin for the active users of the digital subscriber line environment. Furthermore, a communication system can contain such a device.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: October 21, 2014
    Assignee: Adtran GmbH
    Inventors: Martin Kuipers, Anja Klein, Dominique Würtz
  • Patent number: 8867629
    Abstract: A method of power line communications includes obtaining timing information for an AC mains signal transmitted on a power line in a power line communication (PLC) system that includes at least one receiver and at least one other device connected on the power line which provides variable loading during cycles of the AC mains signal. A first loading interval within at least a first cycle of the cycles having lower loading and at least a second loading interval within said first cycle having higher loading are identified using the timing information. At least one data packet is transmitted only during the first loading interval over the power line to the receiver.
    Type: Grant
    Filed: April 9, 2012
    Date of Patent: October 21, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Anand G. Dabak, Gang Xu
  • Publication number: 20140307765
    Abstract: A method for determining a default gain of a wireless transmission system is provided. The wireless transmission system includes a signal transmission path and a signal feedback path coupled to the signal transmission path. The signal transmission path includes a power amplification circuit and a gain stage having a plurality of transmission gains. The method includes the following step: setting a gain of the gain stage as a specific transmission gain of the transmission gains; transmitting a plurality of test signals through the signal transmission path in sequence to generate a plurality of amplified test signals, wherein at least a portion of powers of the test signals correspond to the transmission gains, respectively; receiving the amplified test signals through the signal feedback path in sequence, and accordingly obtaining corresponding signal gains; and determining a default gain of the gain stage according to the signal gains.
    Type: Application
    Filed: April 15, 2014
    Publication date: October 16, 2014
    Applicant: Realtek Semiconductor Corp.
    Inventors: Yuan-Shuo Chang, Chien-Yu Chen
  • Publication number: 20140307764
    Abstract: A method for operating a transmission device of a magnetic resonance device is provided. In order to actuate coil elements of a radiofrequency coil with different phases, phase differences in a reference plane are taken into consideration. In a first calibration measurement to be performed once for each transmission path, a first phase of a transmitted radiofrequency signal is measured by an internal measuring device installed permanently in the transmission device spaced apart from the reference plane. A second phase of the transmitted radiofrequency signal is measured by a second, external measuring device to be connected to the reference plane for the first calibration measurement. At least one phase of the first phase and the second phase is taken into consideration in the phase-accurate actuating of the coil elements and/or for correcting further measurements with the internal measuring device.
    Type: Application
    Filed: April 12, 2014
    Publication date: October 16, 2014
    Inventors: Holger Adolf, Thomas Benner, Hans-Peter Fautz, Joerg Ulrich Fontius, Rene Gumbrecht
  • Patent number: 8861577
    Abstract: A fault detection system and a processor implemented method of detecting a wire fault in a wired network are described. The wired network services a set of customer equipment devices. In one aspect, a method comprises: obtaining, from a plurality of the customer equipment devices, pre-equalization coefficients associated with equalizers of the plurality of the customer equipment devices; determining tap energies for taps associated with the equalizers based on the pre-equalization coefficients; selecting one of the taps; for each of a plurality of the customer equipment devices, assigning the customer equipment device to one of a plurality of groups by comparing the tap energy for the selected tap for that customer equipment device to thresholds associated with the groups; and determining that a wire fault is probable when one of the groups includes at least a threshold number of customer equipment devices.
    Type: Grant
    Filed: February 14, 2013
    Date of Patent: October 14, 2014
    Assignee: Rogers Communications Inc.
    Inventors: Jianming Liu, Jun Ma, Lixin Shi, Jianguo Feng
  • Patent number: 8861579
    Abstract: Systems and methods for measuring transmitter and/or receiver I/Q impairments are disclosed, including iterative methods for measuring transmitter I/Q impairments using shared local oscillators, iterative methods for measuring transmitter I/Q impairments using intentionally-offset local oscillators, and methods for measuring receiver I/Q impairments. Also disclosed are methods for computing I/Q impairments from a sampled complex signal, methods for computing DC properties of a signal path between the transmitter and receiver, and methods for transforming I/Q impairments through a linear system.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: October 14, 2014
    Assignee: National Instruments Corporation
    Inventors: Stephen L. Dark, Christopher J. Behnke
  • Patent number: 8861580
    Abstract: Methods and apparatus are provided for determining one or more channel compensation parameters based on data eye monitoring. According to one aspect of the invention, a method is provided for evaluating the quality of a data eye associated with a signal. The received signal is sampled for a plurality of different phases, for example, using at least two latches, and the samples are evaluated to identify when the signal crosses a predefined amplitude value, such as a zero crossing. It is determined whether the points of predefined amplitude crossing satisfy one or more predefined criteria. One or more parameters of one or more channel compensation techniques can optionally be adjusted based on a result of the determining step. One or more parameters of an adjacent transmitter can also be adjusted to reduce near end cross talk based on a result of the determining step.
    Type: Grant
    Filed: May 16, 2006
    Date of Patent: October 14, 2014
    Assignee: Agere Systems LLC
    Inventors: Christopher J. Abel, Mohammad S. Mobin, Gregory W. Sheets, Lane A. Smith
  • Patent number: 8861578
    Abstract: Methods, apparatus and systems for measuring signal transition times for a four-level pulse modulated amplitude (PAM4) transmitter. During a test procedure, a PAM4 transmitter is configured to repetitively transmitting a four-level test pattern, which is captured and digitized. The digitized data is processed to generate a linear-fitted waveform. A voltage modulation amplitude (VMA) level for each of a ?1 and +1 PAM4 signal level is measured and used to derive 20% and 80% VMA levels in an eye diagram. The rise transition time is then determined by measuring the time interval between when a rising signal crosses the 20% and 80% VMA levels, and the fall transition time is determined by measuring the time interval between when a falling signal crosses the 80% and 20% VMA levels.
    Type: Grant
    Filed: June 25, 2013
    Date of Patent: October 14, 2014
    Assignee: Intel Corporation
    Inventors: Kent C. Lusted, Adee O. Ran
  • Patent number: 8861588
    Abstract: A method and system of reconstructing data signals from one of incomplete measurements comprising a receiver for receiving data signals, an ADC system operatively connected to the receiver that digitizes the received data signal at a slower rate than the Nyquist rate to obtain sparse measurements; first and second dictionaries comprising a plurality of time shifted responses recovered from the data signal; the first dictionary comprising time shifted versions of the previously observed data signals which are sampled at or above the Nyquist minimum sample rate; the second dictionary comprising time shifted versions are sampled below the Nyquist minimum, and at least one processor for reconstruction of the waveform signals by transforming the sub-Nyquist digitized output using the first and second dictionaries to produce the data signal.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: October 14, 2014
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Lam Huy Nguyen, Trac D Tran
  • Patent number: 8855180
    Abstract: The disclosure relates to a receiver system that employs multiple instances of a DC compensation system to reduce DC offsets in a receiver path. The receiver has a receiver front end configured to receive an RF input signal and to operate on the RF input signal according to a plurality of receiver states to generate a baseband signal having a DC offset that is based upon the plurality of receiver states. A DC offset compensation circuit implements a plurality of instances of DC offset compensation components that respectively generate an estimated DC offset corresponding to a receiver state. A controller controls the receiver state of the receiver front end and operates the DC offset elimination circuit to selectively apply one of the plurality of DC compensation components to the corresponding baseband signal based upon the receiver state.
    Type: Grant
    Filed: October 31, 2012
    Date of Patent: October 7, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Peter Noest, Peter Bode, Thorsten Tracht, Clemens Troebinger
  • Patent number: 8855182
    Abstract: In an emphasis optimization device, a calculating unit calculates an inverse characteristic of an amplitude characteristic based on the amplitude characteristic of a transmission path, and an inverse Fourier transform unit performs an inverse Fourier transform on the inverse characteristic to obtain an impulse response. An extracting unit extracts, from the obtained impulse response, an impulse response corresponding to the number of taps necessary for emphasis to be added to a digital signal to be transmitted on the transmission path. An emphasis amount calculating unit converts the extracted impulse response into a value of the emphasis to calculate an emphasis amount.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: October 7, 2014
    Assignee: Anritsu Corporation
    Inventors: Takashi Murakami, Kosuke Sasaki, Ken Mochizuki
  • Patent number: 8855181
    Abstract: A method and a system for compensating a delay mismatch between a first measurement channel and a second measurement channel is disclosed. A method for compensating a delay mismatch between a first measurement channel and a second measurement channel includes providing a reference point for starting the first and second measurement channel, and starting the first measurement channel after expiration of a first delay period which begins at the reference point. The method further includes starting the second measurement channel after expiry of a second delay period which begins at the reference point, wherein a difference between a length of the first delay period and a length of the second delay period is substantially equal to the delay mismatch between the first measurement channel and the second measurement channel.
    Type: Grant
    Filed: February 6, 2013
    Date of Patent: October 7, 2014
    Assignee: Infineon Technologies AG
    Inventor: Jens Barrenscheen
  • Patent number: 8855179
    Abstract: On-chip at-speed eye measurements of digitized signals in data and timing recovery circuits are disclosed. Eye diagrams and jitter measurements are used to evaluate signal quality and bath-tub Bit Error Rate characteristics in baseband communication systems. This disclosure describes a method and apparatus for digitally sampling a received signal at speed to produce an eye diagram of the received signal. This involves adding a small amount of circuitry to the existing prior art systems that use an interpolator for timing recovery and data recovery. In the present disclosure a temporary offset is applied to the interpolation index of the interpolator to obtain interpolated samples between the baud center and baud edge. The eye diagram can be produced from the received digitized and interpolated signal before equalization, or alternatively from the equalized signal.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: October 7, 2014
    Assignee: PMC-Sierra US, Inc.
    Inventor: Aryan Saed
  • Patent number: 8855178
    Abstract: An exemplary signal transmitter includes a checking circuit and a driving circuit. The checking circuit is arranged for checking a plurality of successive data bits to be transmitted and accordingly generating a checking result. The driving circuit is arranged for referring to the checking result and transmitting a specific data bit with a plurality of different predetermined voltage levels. An exemplary signal transmitting method includes: checking a plurality of successive data bits to be transmitted, and accordingly generating a checking result; and transmitting a specific data bit with a plurality of different predetermined voltage levels according to the checking result.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: October 7, 2014
    Assignee: Mediatek Inc.
    Inventor: Tzu-Li Hung
  • Patent number: 8855175
    Abstract: The present disclosure relates to compensation for Passive Intermodulation (PIM) distortion in a receiver. In one embodiment, a communication device includes a transmitter that is configured to receive a digital input signal and output a radio frequency transmit signal, a main receiver configured to receive a radio frequency receive signal and output a digital output signal, and a PIM compensation subsystem. The radio frequency receive signal includes PIM distortion that is a non-linear function of the radio frequency transmit signal output by the transmitter. In order to compensate for the PIM distortion, a PIM compensation subsystem receives the digital input signal of the transmitter, generates a digital PIM estimate signal that is an estimate of the PIM distortion in the digital output signal of the main receiver, and subtracts the digital PIM estimate signal from the digital output signal of the main receiver.
    Type: Grant
    Filed: January 2, 2013
    Date of Patent: October 7, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Mark Wyville, Lars Johan Thorebäck
  • Publication number: 20140294052
    Abstract: A transmitter for use in a cable modem termination system includes a data processing module that generates a plurality of OFDM symbols from a data packet. A probe symbol generator generates a probe symbol, as one of a plurality of probe symbol types. The probe symbol is selectively inserted within the plurality of OFDM symbols, at a pre-defined probe symbol interval.
    Type: Application
    Filed: March 17, 2014
    Publication date: October 2, 2014
    Applicant: BROADCOM CORPORATION
    Inventors: Bruce Joseph Currivan, Richard Stephen Prodan, Thomas Joseph Kolze, Hanli Zou, Ramon Alejandro Gomez, Leo Montreuil, Mark Edward Laubach, Roger Wayne Fish, Lisa Voigt Denney, Niki Roberta Pantelias, Jonathan Sooki Min
  • Publication number: 20140294051
    Abstract: A transmitting device, a receiving device, a circuit device, and a communication method to reduce problems due to coupling present between the transmitting device and the receiving device. The transmitting device including: a model storage unit for storing a change model for a reference level of a signal on the receiving device end due to coupling between the transmitting device and a receiving device; a compensation calculating unit for calculating a compensation value for offsetting a change in the reference level of the signal constituting a symbol sequence; and an output waveform changing unit for changing an output waveform of the signal constituting the symbol sequence on the basis of the compensation value for the change in the reference level.
    Type: Application
    Filed: March 5, 2014
    Publication date: October 2, 2014
    Applicant: International Business Machines Corporation
    Inventors: Yasuteru Kohda, Kohji Takano
  • Publication number: 20140294053
    Abstract: A management data region including a plurality of pulse-like signals is included in a series of pulse-like signals output from the master station to the common data signal line, and different from a control/monitoring data region including data of a control data signal and data of a monitoring data signal. Further, when data corresponding to a signal level of an input part is larger than a lower limit threshold value and smaller than an upper limit threshold value, an abnormal state is determined to have been occurred, a low sensitivity state of a signal of an input part is detected based on the determination result of the abnormal state, and a signal configuring data indicating the low sensitivity state is superimposed on the management data region.
    Type: Application
    Filed: November 15, 2011
    Publication date: October 2, 2014
    Applicant: ANYWIRE CORPORATION
    Inventors: Kenji Nishikido, Youichi Hoshi, Shotaro Kusumoto
  • Patent number: 8848827
    Abstract: A method of communicating a chirp signal from a transmitter suitable for receipt at a proximal receiver and a distal receiver, the chirp signal including a plurality of packets, each packet including at least one symbol, each symbol including one or more identical chirps, the method including: generating the chirp signal by interleaving constituent packets of: (i) a first set of packets encoded with first data, each packet including one or more symbols having a first time period t1, and (ii) a second set of packets encoded with second data, each packet including one or more symbols having a second time period t2, where t1<t2; and transmitting the generated chirp signal.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: September 30, 2014
    Assignee: Cambridge Silicon Radio Limited
    Inventor: Paul Dominic Hiscock
  • Publication number: 20140286378
    Abstract: A receiving circuit includes: an interpolation circuit that generates, by using an interpolation coefficient, output data including a data point and a boundary point from pieces of input data that are input in chronological order; a detection circuit that outputs a detection signal when the detection circuit detects a phase of the output data by using the boundary point of the output data; a low pass filter that filters the detection signal and generates the interpolation coefficient; and a modulation circuit that modulates, by using a modulation signal having a frequency different from a cutoff frequency of the low pass filter, the interpolation coefficient generated by the low pass filter, and outputs the modulated interpolation coefficient to the interpolation circuit.
    Type: Application
    Filed: December 17, 2013
    Publication date: September 25, 2014
    Applicant: FUJITSU LIMITED
    Inventor: Yoshiyasu DOI
  • Patent number: 8842552
    Abstract: Method and system for facilitating testing of multiple time-division-duplex (TDD) data packet signal transceivers. Replicas of a data packet signal are transmitted by a tester to multiple TDD devices under test (DUTs), where the replicated signal is either a null or TDD data packet signal. In one embodiment, replica null data packet signals are transmitted for a predetermined time interval sufficient for the DUTs to synchronize with the tester. In another embodiment, following successful and unsuccessful receptions of responsive signals from respective DUTs indicating successful reception of their respective replica TDD data packet signals and, therefore, synchronization with the tester, corresponding replica TDD data packet signals are provided with data packet signal characteristics causing such replica data packet signals to fail to conform or to conform, respectively, with a predetermined data packet signal standard.
    Type: Grant
    Filed: December 17, 2012
    Date of Patent: September 23, 2014
    Assignee: Litepoint Corporation
    Inventors: Christian Volf Olgaard, Wing Hung Lee, Guang Shi, Sang Yui Hon
  • Patent number: 8843809
    Abstract: A data processing device including a controller configured to control the data processing device to execute steps of: receiving a data packet comprising a group identification information that identifies a restoration group, with which the data packet is associated, and redundant data for restoring a lost data packet, which is associated with the restoration group identified by the group identification information; determining whether a received amount of data packet associated with the restoration group identified by the group identification information is equal to or greater than a predetermined value; and restoring the lost data packet associated with the restoration group identified by the group identification information when the received amount of data packet associated with the restoration group identified by the group identification information is equal to or greater than the predetermined value.
    Type: Grant
    Filed: March 26, 2012
    Date of Patent: September 23, 2014
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventor: Masatoshi Sugiura
  • Publication number: 20140269866
    Abstract: Apparatus and methods for loss of signal detection are provided. In one embodiment, a detection circuit for monitoring an input includes a small signal boost circuit, a rectifier circuit, a low-pass filter, and one or more comparators. The small signal boost circuit can generate an amplified signal by providing a first amount of gain to an input signal when the input signal is relatively small, but can saturate and provide reduced gain without external gain control adjustment when the input signal does not have a relatively small magnitude. The rectifier circuit can rectify the boosted signal to generate a rectified signal, and the low-pass filter can filter the rectified signal to generate a filtered signal. The one or more comparators can compare the filtered signal to one or more decision threshold voltages to determine the presence or absence of the input signal on the input.
    Type: Application
    Filed: March 13, 2013
    Publication date: September 18, 2014
    Applicant: ANALOG DEVICES, INC.
    Inventors: Andrew Y. Wang, Stefano I. D'Aquino
  • Publication number: 20140269871
    Abstract: A method of facilitating wireless testing of multiple radio frequency (RF) signal transceiver devices under test (DUTs). Using multiple antennas within a shielded enclosure containing the DUTs, multiple wireless RF test signals radiated to the DUTs can have their respective signal phases controlled to maximize the direct-coupled signals to their respective intended DUTs while minimizing the cross-coupled signals. Additionally, the wireless RF test signals radiated to the DUTs can have their respective signal magnitudes controlled to normalize the direct-coupled signals to their respective intended DUTs while still sufficiently reducing the cross-coupled signals. As a result, compensation is provided for the multipath signal environment within the shielded enclosure, thereby simulating wired test signal paths during wireless testing of the DUTs.
    Type: Application
    Filed: June 7, 2013
    Publication date: September 18, 2014
    Inventor: Minh-Chau HUYNH
  • Publication number: 20140269868
    Abstract: An adaptive filter bank can be implemented on a PLC device to dynamically adapt to variations in notching requirements and the performance of the PLC medium. The PLC device can apply filter coefficients to one or more filter elements of the adaptive filter bank to generate one or more notched subcarriers in the PLC band. A performance measurement of one or more subcarriers in the PLC band can be determined and evaluated against corresponding performance measurement thresholds. For a given notched subcarrier, if the performance measurement of the corresponding subcarriers is not in accordance with the performance measurement threshold, updated filter coefficients for the filter element configured to generate the notched subcarrier can be determined based, at least in part, on the performance measurement of the one or more subcarriers. The filter coefficients of the filter element can then be updated using the updated filter coefficients.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: QUALCOMM INCORPORATED
    Inventors: Marc W. Werner, Stefan Brueck, Lawrence W. Yonge, III
  • Publication number: 20140269870
    Abstract: In accordance with the presently claimed invention, a system and method are provided for testing multiple-input, multiple-output wireless radiofrequency (RF) packet data signal transceivers while operating in such ways as to communicate their signals using various combinations or permutations of packet data streams without requiring termination or re-establishment of communication links following transitions from one combination or permutation of packet data streams to another.
    Type: Application
    Filed: May 15, 2013
    Publication date: September 18, 2014
    Inventor: LITEPOINT CORPORATION
  • Publication number: 20140269869
    Abstract: A method of estimating a defect location within a network is provided. Information of pre-equalization coefficients of an adaptive pre-equalizer of a terminal network element on the network is received. A total amount of equalization applied by a negative delay portion of the adaptive pre-equalizer relative to a main tap level and a total amount of equalization applied by a positive delay portion of the adaptive pre-equalizer relative to the main tap level is determined. The terminal network element is determined as being affected by a defect if at least one of the total amount of equalization applied by the negative or positive delay portions relative to the main tap level is at an unacceptable level. If a defect is identified, a location of the defect is estimated differently depending upon whether the negative or positive delay portion of the adaptive pre-equalizer applies the greatest amount of equalization.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 18, 2014
    Applicant: GENERAL INSTRUMENT CORPORATION
    Inventors: David B. Bowler, Brian M. Basile, Clarke V. Greene
  • Publication number: 20140269867
    Abstract: An apparatus can include a detector configured to detect a burst event for a selected frequency of a digital input signal having a predetermined bandwidth. The detector can provide a burst trigger, in response to detecting the burst event relative to a threshold, and provide other burst data for the detected burst event. A signal analyzer can be configured to measure signal information for another selected frequency of the digital input signal in response to the burst trigger. The signal analyzer can provide corresponding analysis data based on the measured signal information, the burst trigger, the other burst data, and the corresponding analysis data can be stored in memory.
    Type: Application
    Filed: March 14, 2013
    Publication date: September 18, 2014
    Applicant: CISCO TECHNOLOGY, INC.
    Inventors: RICK MELLER, Glendon Leo Akins
  • Patent number: 8838033
    Abstract: Methods and systems for processing a signal with a corresponding noise profile are disclosed. Aspects of the method may comprise analyzing spectral content of the noise profile. At least one noise harmonic within the signal may be filtered based on said analyzed spectral content. The filtered signal may be amplified. The noise profile may comprise a phase noise profile. The signal may comprise at least one of a sinusoidal signal and a noise signal. At least one filter coefficient that is used to filter the at least one noise harmonic may be determined. The filtering may comprise low pass filtering. The signal may be modulated prior to filtering. The amplifying may comprise buffering. A non-linearity characteristic of the signal may be determined and a noise harmonic may be low-pass filtered within the signal based on the determined non-linearity characteristic.
    Type: Grant
    Filed: December 7, 2004
    Date of Patent: September 16, 2014
    Assignee: Broadcom Corporation
    Inventor: Shervin Moloudi
  • Patent number: 8837565
    Abstract: The present disclosure provides an evaluation unit which includes a central data-processing unit, at least one storage unit and an allocation unit, wherein the allocation unit and the at least one storage unit (3) are connected to the central data-processing unit. The central data-processing unit loads at least one OFDM signal from the at least one storage unit and transfers this to the allocation unit. The allocation unit displays the individual signal spaces of the OFDM symbols of the at least one OFDM signal in a constellation diagram and in a frame-output matrix in such a manner that it is possible to allocate via the diagrams at which signal spaces data symbols and/or pilot symbols and/or zero symbols and/or don't care symbols are present and with which modulation type the data symbols and/or pilot symbols are modulated.
    Type: Grant
    Filed: November 15, 2011
    Date of Patent: September 16, 2014
    Assignee: Rohde & Schwarz GmbH & Co. KG
    Inventors: Susanne Hirschmann, Martin Weiss, Gregor Feldhaus
  • Patent number: 8837295
    Abstract: An in-band diagnostic tool and method are described herein that are capable of retrieving subscriber information from one or more nodes located within a layer 2 aggregation network. In one application, the diagnostic tool and method can be used by a customer service representative to retrieve subscriber information (e.g., user privileges, current bandwidth usage, available bandwidth) related to a customer that receives television, Internet etc. from an Internet Protocol Television (IPTV) network (which is an application-specific layer 2 aggregation network).
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: September 16, 2014
    Assignee: Alcatel Lucent
    Inventors: Kamakshi Sridhar, Marcus K. Weldon, Johan Van Besouw, Ludwig Pauwels, Sven Ooghe
  • Publication number: 20140254648
    Abstract: A method for determining a channel variation metric by an electronic device is described. The method includes receiving a first packet. The method also includes receiving a second packet. The method further includes determining a channel variation metric that approximates a mean square error value based on a first channel estimate corresponding to a first packet and a second channel estimate corresponding to a second packet. The method additionally includes performing an operation based on the channel variation metric.
    Type: Application
    Filed: March 6, 2013
    Publication date: September 11, 2014
    Applicant: QUALCOMM Incorporated
    Inventor: Didier Johannes Richard Van Nee
  • Publication number: 20140254647
    Abstract: Systems and methods are disclosed herein to provide communication test systems for the testing of packet data communication devices, systems and networks. According to one aspect of the subject matter described herein, a test system containing an integrated traffic, protocol and waveform analyzer is disclosed that includes a traffic generator/analyzer and a protocol engine that triggers a waveform analyzer to analyze the signal waveform of a device under test at a predetermined point. Such a test system may offer improved capabilities such as a more selective and accurate measurement of complex signal waveforms, more automated measurements of waveforms pertaining to wireless communication data streams, and more rapid identification and measurement of waveforms corresponding to errored packets.
    Type: Application
    Filed: March 5, 2013
    Publication date: September 11, 2014
    Inventors: Lester Noel Stott, David Jennings Wicker, JR., Jeffrey Dean Marker, Alexander David Rekow, Timothy Earl Bennington-Davis, Thomas Alexander
  • Publication number: 20140254651
    Abstract: An apparatus and a method are provided including a parameter estimator, a controller, an initial channel estimator, and a channel estimator. The parameter estimator configured to estimate parameters related to a channel. The controller configured to select one of channel environments based on the parameters, and generate a control signal corresponding to the selected channel environment. The initial channel estimator configured to estimate an initial channel based on the control signal. The channel estimator configured to estimate a channel of remaining resource blocks, excluding resource blocks corresponding to a pilot signal, from among resource blocks, based on the initial channel and the control signal.
    Type: Application
    Filed: March 4, 2014
    Publication date: September 11, 2014
    Applicant: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Gyu Bum KYUNG, Ho YANG
  • Publication number: 20140254654
    Abstract: A method for detecting the digital quality of a radio signal includes: receiving a radio signal including a digital portion modulated by a series of symbols each including a plurality of samples; computing correlation points between endpoint samples in cyclic prefix regions of adjacent symbols; and using the correlation points to produce a digital signal quality metric. Receivers that implement the method are also provided.
    Type: Application
    Filed: May 22, 2014
    Publication date: September 11, 2014
    Inventors: Brian W. Kroeger, Paul J. Peyla
  • Publication number: 20140254652
    Abstract: A digital broadcasting receiving system is provided. A receiving module receives an M number of symbols each carrying an N number of subcarriers of a control signal. A converting module performs FFT on respective kth subcarriers of an ith symbol and an (i+1)th symbol to generate an (i, k)th converted value and an (i+1, k)th converted value. A demodulating module performs differential demodulation on the (i, k)th and (i+1, k)th converted values to generate an (i, k)th demodulation value. A combining module soft-combines the (i, 1)th demodulation value through the (i, N)th demodulation value to generate an ith prediction value corresponding to the ith symbol. A determining module identifies a synchronization segment in the control signal according to the 1st prediction value to the (M?1)th prediction value.
    Type: Application
    Filed: March 7, 2014
    Publication date: September 11, 2014
    Applicant: MStar Semiconductor, Inc.
    Inventors: Ching-Fu Lan, Hsin-Chuan Kuo, Tung-Sheng Lin, Tai-Lai Tung
  • Publication number: 20140254649
    Abstract: Rate adaptation in network communications can be determined, at least in part, by bit error rates through network communication channels. Bit error rates can provide an indication of channel conditions and can guide selection of data rate settings by network devices. Relatively good channel conditions can support relatively higher data rates while communication channels with relatively more noise and/or interference can support relatively lower data rates. Transmitted data can be coded with Forward Error Correction codes that can allow determination of bit error rates resulting from transmission. In one embodiment, bit error rates can guide carrier selection when data is transmitted with groups of two or more carriers such as with orthogonal frequency division multiplexing modulation.
    Type: Application
    Filed: March 7, 2013
    Publication date: September 11, 2014
    Applicant: QUALCOMM INCORPORATED
    Inventors: Hassan Afkhami, Purva R. Rajkotia, Manjunath Anandarama Krishnam
  • Publication number: 20140254653
    Abstract: In an example, a self-testing integrated circuit (IC) includes N channels i and a controller, where i is an integer from 1 to N. Each channel i may include a clock and data recovery circuit (CDR), a pseudorandom bit stream (PRBS) generator circuit, and a PRBS checker and eye quality monitor (EQM) circuit. The controller may be configured to selectively couple the channels i in a daisy chain during self-testing.
    Type: Application
    Filed: March 7, 2014
    Publication date: September 11, 2014
    Applicant: FINISAR CORPORATION
    Inventor: The' Linh Nguyen
  • Publication number: 20140254650
    Abstract: Methods and apparatuses for adaptable receiver detection are provided. Embodiments include providing, by receiver detection circuitry at a transmitter coupled to a communication link, a voltage to the communication link; determining, by the receiver detection circuitry, a rise time corresponding to a rising edge change of the voltage on the communication link; determining, by the receiver detection circuitry, a fall time corresponding to a falling edge change of the voltage on the communication link; and determining, by the receiver detection circuitry, whether the rise time and the fall time are consistent with the transmitter being coupled through the communication link to a remote receiver.
    Type: Application
    Filed: March 11, 2013
    Publication date: September 11, 2014
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: John J. Bergkvist, JR., Steven M. Clements, Carrie E. Cox, Hayden C. Cranford, JR., Todd E. Leonard
  • Patent number: 8831078
    Abstract: Method for identifying within an incident signal at least one frequency communication channel, the incident signal being received on a wireless apparatus, comprising determining a power spectral density (PSD) of that incident signal and identifying the at least one channel from the PSD. The PSD determination comprises storing temporal samples of the incident signal received during a predetermined duration and performing a first Discrete Fourier Transform (DFT) processing on the stored samples.
    Type: Grant
    Filed: December 1, 2010
    Date of Patent: September 9, 2014
    Assignee: Ericsson Modems SA
    Inventors: Eric Alliot, Mark Wallis, Issam Toufik
  • Patent number: 8831071
    Abstract: Communication devices and methods are disclosed, wherein a test signal is generated at a first frequency and a higher harmonic of said test signal is received and processed at a second frequency higher than said first frequency.
    Type: Grant
    Filed: January 20, 2010
    Date of Patent: September 9, 2014
    Assignee: Intel Mobile Communications GmbH
    Inventors: Markus Hammes, Stefan Van Waasen
  • Patent number: 8832513
    Abstract: A processor link that couples a first processor and a second processor is selected for validation and a plurality of communication parameter settings associated with the first and the second processors is identified. The first and the second processors are successively configured with each of the communication parameter settings. One or more test data pattern(s) are provided from the first processor to the second processor in accordance with the communication parameter setting. Performance measurements associated with the selected processor link and with the communication parameter setting are determined based, at least in part, on the test data pattern as received at the second processor. One of the communication parameter settings that is associated with the highest performance measurements is selected. The selected communication parameter setting is applied to the first and the second processors for subsequent communication between the first and the second processors via the processor link.
    Type: Grant
    Filed: November 20, 2013
    Date of Patent: September 9, 2014
    Assignee: International Business Machines Corporation
    Inventors: Robert W. Berry, Anand Haridass, Prasanna Jayaraman