Testing Patents (Class 375/224)
  • Patent number: 8774257
    Abstract: A method of tuning a driving current of a data transmission interface includes: utilizing a driving current with a present current value to continuously send a test data to a receiving end; accumulating a number of times that the test data is sent to generate a transmission counting result; determining whether a transmission error occurs while the test data is sent to the receiving end and accumulating a number of times that the transmission error occurs to generate a transmission error counting result; and when the transmission counting result reaches a predetermined value, determining how to tune the present current value of the driving current according to the transmission error counting result.
    Type: Grant
    Filed: February 14, 2011
    Date of Patent: July 8, 2014
    Assignee: Realtek Semiconductor Corp.
    Inventors: Kuang-Yu Yen, Chih-Hung Tsai
  • Patent number: 8774262
    Abstract: Methods, apparatuses, and systems are presented for performing adaptive equalization involving receiving a signal originating from a channel associated with inter-symbol interference, filtering the signal using a filter having a plurality of adjustable tap weights to produce a filtered signal, and adaptively updating each of the plurality of adjustable tap weights to a new value to reduce effects of inter-symbol interference, wherein each of the plurality of adjustable tap weights is adaptively updated to take into account a constraint relating to a measure of error in the filtered signal and a constraint relating to group delay associated with the filter. Each of the plurality of adjustable tap weights may be adaptively updated to drive group delay associated with the filter toward a target group delay.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: July 8, 2014
    Assignee: Vitesse Semiconductor Corporation
    Inventors: Sudeep Bhoja, John S. Wang, Hai Tao
  • Patent number: 8767865
    Abstract: A wireless station of the present invention includes: a synchronization unit configured to synchronize with a transmission suspension period of a transmitting station of a wireless system, a measurement unit configured to measure a reception level of a wireless signal of said transmitting station in a transmission period and a reception level in the transmission suspension period, and an interference estimation unit configured to estimate an amount of interference to another wireless system according to the measured reception level in the transmission suspension period and reception level in the transmission period.
    Type: Grant
    Filed: September 21, 2011
    Date of Patent: July 1, 2014
    Assignee: NEC Corporation
    Inventor: Kazushi Muraoka
  • Patent number: 8767870
    Abstract: Embodiments of the present invention provide a variable inter symbol interference generator that generates a data signal having a variable amount of inter symbol interference by passing a data signal through (1) a programmable filter having an adjustable frequency response, and through (2) a fixed filter having a fixed frequency response such as a PCB trace, a length of cable, a discrete filter, or the like. By adjusting the parameters and therefore the insertion gain or loss of the programmable filter, and combining this with one or more fixed filters, a large range of continuously variable and finely tunable inter symbol interference amounts can be easily generated.
    Type: Grant
    Filed: August 24, 2012
    Date of Patent: July 1, 2014
    Assignee: Tektronix, Inc.
    Inventors: James R. Waschura, Senthil Kumar Thandapani, Timothy E. Sauerwein
  • Patent number: 8767809
    Abstract: Improved diagnostics of transmission line (100) noise are enabled by adapting DSL equipment (110, 120) to make measurements of quiet line noise also in the transmit bands, so that noise can be measured at both ends for the same frequency or frequency bands. An estimate of the point where noise enters the line, as well as an estimate of the noise power at that point can be made from the relationship between the so measured noise levels at both ends of the line.
    Type: Grant
    Filed: April 30, 2009
    Date of Patent: July 1, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Miguel Berg, Daniel Cederholm
  • Publication number: 20140177699
    Abstract: An equalizer includes a first discrimination circuit to receive an input signal corresponding to a signal output from a transmit-side equalizer to binarize the input signal by a first threshold value in unit time, a second discrimination circuit to binarize the input signal by a second threshold value in unit time, a first delay circuit to delay an output signal of the first discrimination circuit and that includes N-number (N>=2) of stages of unit delay circuits connected in cascade and operating in unit time, a second delay circuit to receives an output signal of the second discrimination circuit and that includes not less than an (N+1)-number of stages of unit delay circuits connected in cascade and operating in unit time, and a control unit that receives an output of the first delay circuit, and a second output signal output from the second delay circuit.
    Type: Application
    Filed: December 18, 2013
    Publication date: June 26, 2014
    Applicant: RENESAS ELECTRONICS CORPORATION
    Inventors: Kenzo TAN, Masahiro TAKEUCHI
  • Publication number: 20140177692
    Abstract: The present invention discloses a hybrid power line/wireless appliance automation system for interfacing between at least one electric power distribution circuit and at least one electronic device, a power line communication device, and a power monitoring method using the same. Each power line communication device can be communicatively interconnected via power line communication and/or wireless communication. A threshold value of each power line communication device is dynamically adjusted by a host device via wired or wireless connection, so as to determine whether to continuously supply or turn off power to an electronic device coupled to the power line communication device. The present invention may be implemented/integrated to existing household electric power network without the need for additional physical data network infrastructure/lines, therefore is suitable to be applied in an intelligent home management system.
    Type: Application
    Filed: November 30, 2013
    Publication date: June 26, 2014
    Applicants: LITE-ON TECHNOLOGY CORPORATION, LITE-ON ELECTRONICS (GUANGZHOU) LIMITED
    Inventor: WEI-LUN YU
  • Patent number: 8761295
    Abstract: A cognitive radio signal processing method suitable for single receiver devices where interference is mitigated using projection of received multi-dimensional signal space to maximize SNR by orthogonalizing interference is described. The method is based on a well-known LMS solution that is computed from received multi antenna and multicarrier signals in a novel way. This method solves the requirement of multiple RF chains in low cost handsets by introducing a protocol synchronous antenna switcher that allows, for example, a LTE handset with a single antenna to benefit from algorithms that typically require multiple receivers for the same frequency, i.e. MIMO.
    Type: Grant
    Filed: November 2, 2012
    Date of Patent: June 24, 2014
    Assignee: XG Technology, Inc.
    Inventor: Pertti Alapuranen
  • Patent number: 8761271
    Abstract: A method of detecting a signal transmitted over one phase of a multi-phase power distribution system, components of the signal concurrently appearing on all phases of the system. The method includes detecting the components of each signal appearing on each phase, including neutral, of the system. Detected signals are provided to a signal processor which processes them to produce a detected signal which is a composite of all the components. The signals are combined by a weighted summation scheme that takes into account signal and noise correlation properties to simultaneously maximize signal strength and suppress noise. If other signals are present on other phases of the system, any resulting interference is canceled out from the detected signal to further improve the quality of the detected signal.
    Type: Grant
    Filed: February 28, 2012
    Date of Patent: June 24, 2014
    Assignee: Aclara Technologies LLC
    Inventor: Quentin Spencer
  • Patent number: 8761028
    Abstract: Apparatus, systems, and methods disclosed herein operate to calibrate path loss parameters corresponding to a communication channel between wireless stations, including a path loss exponent. A time-of-flight (TOF) associated with packet transmissions traversing a path between a first wireless station and a second wireless station is measured. A path length D1 corresponding to the path is calculated from the TOF measurements. One or more received signal strength (RSS) measurements corresponding to the packet transmissions are then made at the first wireless station. The path loss exponent associated with the path is calculated from D1 and the RSS measurements. Some embodiments may also measure RSS values associated with transmissions from a third wireless station. The latter measurements may be used in conjunction with the previously-determined path loss exponent to derive an unknown transmission path length between the first and third wireless stations.
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: June 24, 2014
    Assignee: Texas Instruments Incorporated
    Inventors: Leonardo William Estevez, Deric Waters
  • Patent number: 8761683
    Abstract: Systems, methods, and machine-readable media are disclosed for controlling an electronic device using data transmitted over radio signals. In some embodiments, a radio source may embed instructions to control an electronic device into a radio signal. For example, the radio source may use the RDS communications protocol to transmit the instructions in an FM radio signal. The electronic device may receive the radio signal and may perform the instructions included in the radio signal. For example, in a testing environment, the instructions can include commands to test the electronic device's radio using test parameters specified in the instructions. Responsive to receiving the test parameters, the electronic device may configure itself (e.g., turn on or off certain components) and record audio from a specified radio station.
    Type: Grant
    Filed: August 28, 2009
    Date of Patent: June 24, 2014
    Assignee: Apple Inc.
    Inventors: Daniel A. Warren, Matthew Rogers, Timothy Patrick Hannon, Michael Ingrassia
  • Publication number: 20140169428
    Abstract: The present invention describes methods and apparatus for adaptive polarization transmission. An exemplary embodiment of the present invention provides an adaptive polarization transmission method. The method includes the step of analyzing at a transmitter device a first set of polarization state information relating to a first wireless signal path. Furthermore, the method includes the step of adapting a transmission signal to be distributed by the transmitter device based on at least the first set of polarization state information. In addition to adaptive polarization transmission methods, the present invention provides various adaptive polarization transmission systems. In an exemplary embodiment, an adaptive polarization transmission system includes a transmitter device. The transmitter device includes an analyzing unit for processing a first set of polarization state information relating to a first wireless signal path.
    Type: Application
    Filed: December 10, 2013
    Publication date: June 19, 2014
    Applicant: Georgia Tech Research Corporation
    Inventors: Thomas G. Pratt, Brett T. Walkenhorst
  • Publication number: 20140169431
    Abstract: An apparatus may include a processor circuit, and a dynamic filter adjustment component for execution on the processor. The dynamic filter adjustment component may identify in a wideband communications signal a set of one or more interferer frequencies for one or more respective interferer channels of a set of communications channels to be filtered, select a kernel filter comprising a low pass filter having a channel width corresponding to a channel of the one or more interferer channels, and generate a co-channel interference (CCI) filter to stop the one or more interferer channels by inverting the kernel filter. Other embodiments are described and claimed.
    Type: Application
    Filed: December 18, 2012
    Publication date: June 19, 2014
    Inventors: Bernard Arambepola, Thushara Hewavithana
  • Publication number: 20140169427
    Abstract: A method of calibrating an envelope tracking system for a supply voltage for a power amplifier module within a radio frequency (RF) transmitter module. The method includes deriving a mapping function between an instantaneous envelope of a waveform signal to be amplified by the power amplifier module and the power amplifier module supply voltage to achieve a constant power amplifier module gain based on a gain compression factor, setting an envelope tracking path of the transmitter module into an envelope tracking mode in which mapping between the instantaneous envelope of the waveform signal and the power amplifier module supply voltage is performed using the derived mapping function, applying a training signal comprising an envelope that varies with time to the RF transmitter module, measuring a battery current, modifying the gain compression factor based on the measured battery current, and re-deriving the mapping function based on the modified gain compression factor.
    Type: Application
    Filed: September 30, 2013
    Publication date: June 19, 2014
    Applicant: MediaTek Singapore Pte. Ltd.
    Inventors: Manel Collados Asensio, Hsin-Hung Chen, Jonathan Richard STRANGE
  • Publication number: 20140169415
    Abstract: The method and apparatus disclosed herein improve throughput conditions limited by multiplicative noise by determining precoder weights for each data stream communicated between a MIMO transmitter node and a MIMO receiver node. The precoder weights are determined based on information derived from non-precoded reference symbols to decrease the energy allocated to the dominant signal path relative to the energy allocated to the non-dominant signal paths.
    Type: Application
    Filed: December 14, 2012
    Publication date: June 19, 2014
    Inventors: Karl Werner, Henrik Asplund, Mikael Coldrey, Jonas Medbo, Andreas Nilsson, Mathias Riback
  • Publication number: 20140169426
    Abstract: A receiver containing analog circuitry that generates distortion, a distortion compensation circuit coupled to an output of the analog circuitry, and a slicer, operating as a signal peak detector, coupled to the distortion compensation circuitry. The distortion compensation circuit has a subtractor, a function generator, and a weighting circuit. The subtractor has a first input coupled to the output of the analog circuitry, a second input, and an output. The function generator has an input coupled to the first input of the subtractor. The weighting circuit, responsive to a weighting coefficient, is coupled between an output of the function circuit and the second input of the first subtractor. The function generator has a transfer function with a third-power term and the weighting coefficient is set to a value based on the level of the signal peaks that will least partially reduce distortion in signals on the output of the subtractor.
    Type: Application
    Filed: December 19, 2012
    Publication date: June 19, 2014
    Applicant: LSI CORPORATION
    Inventors: Pervez M. Aziz, Hiroshi Kimura
  • Patent number: 8755810
    Abstract: The present invention discloses a method and apparatus for rank self-adaptation. The method comprises: a base station receiving ranks reported by a user equipment via a rank receiving window, determining a rank at the current moment based on a distribution state of each rank in the rank receiving window at the current moment, and determining the number of independent channels used for sending downstream data to the user equipment based on the rank at the current moment. The present invention can reasonably forecast change of ranks of MIMO channels so as to better use MIMO channel resources to perform data transmission and improve the throughput rate of the MIMO channels.
    Type: Grant
    Filed: March 5, 2010
    Date of Patent: June 17, 2014
    Assignee: ZTE Corporation
    Inventors: Yuanchun Tan, Focai Peng, Liping Liu, Xianxi Li, Juanjuan Liu, Liang Li
  • Patent number: 8754947
    Abstract: Various systems and methods for comparing media signals are disclosed. In some embodiments, media signals are compared by identifying characteristic features in the respective signals and then analyzing the characteristic features to determine if the signals contain corresponding content. In other embodiments, the characteristic features are analyzed to determine the extent to which the signals are synchronized in time.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: June 17, 2014
    Assignee: Evertz Microsystems Ltd.
    Inventor: Jeff Wei
  • Patent number: 8756469
    Abstract: A method and apparatus for evaluating and optimizing a signaling system is described. A pattern of test information is generated in a transmit circuit of the system and is transmitted to a receive circuit. A similar pattern of information is generated in the receive circuit and used as a reference. The receive circuit compares the patterns. Any differences between the patterns are observable. In one embodiment, a linear feedback shift register (LFSR) is implemented to produce patterns. An embodiment of the present disclosure may be practiced with various types of signaling systems, including those with single-ended signals and those with differential signals. An embodiment of the present disclosure may be applied to systems communicating a single bit of information on a single conductor at a given time and to systems communicating multiple bits of information on a single conductor simultaneously.
    Type: Grant
    Filed: June 12, 2013
    Date of Patent: June 17, 2014
    Assignee: Rambus Inc.
    Inventors: Jared Zerbe, Pak Shing Chau, William Franklin Stonecypher
  • Publication number: 20140161166
    Abstract: Described are methods and circuits for margin testing digital receivers. These methods and circuits prevent margins from collapsing in response to erroneously received data, and can thus be used in receivers that employ historical data to reduce intersymbol interference (ISI). Some embodiments detect receive errors for input data streams of unknown patterns, and can thus be used for in-system margin testing. Such systems can be adapted to dynamically alter system parameters during device operation to maintain adequate margins despite fluctuations in the system noise environment due to e.g. temperature and supply-voltage changes. Also described are methods of plotting and interpreting filtered and unfiltered error data generated by the disclosed methods and circuits. Some embodiments filter error data to facilitate pattern-specific margin testing.
    Type: Application
    Filed: August 15, 2013
    Publication date: June 12, 2014
    Applicant: Rambus Inc.
    Inventors: Andrew Ho, Vladimir Stojanovic, Bruno W. Garlepp, Fred F. Chen
  • Publication number: 20140161164
    Abstract: Systems, processes, and structures provide near-field transmit power measurement for MIMO wireless devices (DUT), such as for any of product development, product verification, and/or production testing. A test signal, such as comprising a pulse train signal, is provided to a MIMO device under test (DUT), wherein portions of the test signal controllably steered and sequentially transmitted from each of the device antennas, to one or more test antennas that are positioned in close proximity to the MIMO DUT. The near-field power of the received test signals is measured, to quickly and efficiently determine if one or more data streams of the MIMO DUT has a problem.
    Type: Application
    Filed: December 10, 2012
    Publication date: June 12, 2014
    Applicant: NETGEAR, INC.
    Inventors: Joseph Amalan Arul EMMANUEL, Jonathan M. HUMMEL
  • Publication number: 20140161165
    Abstract: A communications device configured to generate a first diversity signal comprising: a first single coded signal spanning a first frequency sub-band, and a second single coded signal contemporaneous with the first single coded signal spanning a second frequency sub-band offset from the first frequency sub-band such that the total bandwidth of the first diversity signal is greater than the bandwidths of either of the first and second frequency sub-bands alone; and a signal transmitter configured to transmit the first diversity signal to a first counterpart communications device; said first and second single coded signals each being such that, after undergoing a procedure comprising being: transmitted, received, shifted into a receiver frequency sub-band spanning a narrower bandwidth than the total bandwidth of the first diversity signal, and cross-correlated with a replica signal based on the transmitted signal, a single significant peak corresponding to the most direct transmission path is produced.
    Type: Application
    Filed: December 12, 2012
    Publication date: June 12, 2014
    Applicant: CAMBRIDGE SILICON RADIO LIMITED
    Inventor: Paul Dominic Hiscock
  • Patent number: 8750354
    Abstract: An open architecture design for a digital nearfield test system for nearfield testing of a phased array antenna allows the ability to use the components of an individual phased array antenna to be tested in conjunction with a nearfield scanner probe system allowing an efficient and cost-saving “radar testing the radar” scenario.
    Type: Grant
    Filed: May 10, 2011
    Date of Patent: June 10, 2014
    Assignee: Lockheed Martin Corporation
    Inventors: William M. Heruska, Michael Uscinowicz, Gregory A. Arlow, Fred Tanjutco
  • Patent number: 8750355
    Abstract: In 3GPP LTE, user equipment must be able to report reference signal received power (RSRP) measurement to the serving cell's base station. A low-complexity method for asynchronous RSRP measurement in an LTE user equipment receiver is provided which includes frequency shifting the received signal so that the upper or lower half band becomes centered around the DC frequency; decimating the received signal to a width of n·2m samples, n being the reference symbol spacing in the received signal; dividing the samples into n sample vectors with a length of 2m each, superimposing the n sample vectors; and performing FFT operation on the superimposed signal.
    Type: Grant
    Filed: October 20, 2011
    Date of Patent: June 10, 2014
    Assignee: Intel Mobile Communications Technology Dresden GmbH
    Inventor: Andreas Bury
  • Patent number: 8750275
    Abstract: An antenna array control method is illustrated. At least a packet is selected as at least a probing packet every probing period. One radiation pattern in a probing radiation pattern set is used to transmit the probing packet. The radiation pattern with the minimum packet error rate among all radiation patterns is selected as a best radiation pattern. When the probing period expires, a candidate radiation pattern set is obtained according to current probabilities of the radiation patterns to be the best radiation pattern. Transfer probabilities of the radiation patterns in the candidate radiation pattern set are obtained. A target radiation pattern set is obtained according to the transfer probabilities, a motion variation and trend set, and the candidate radiation pattern set. The probing period and the probing radiation pattern set are adjusted according to whether the target radiation pattern set equals to the probing radiation pattern set.
    Type: Grant
    Filed: June 23, 2012
    Date of Patent: June 10, 2014
    Assignees: Lite-On Electronics (Guangzhou) Limited, Lite-On Technology Corporation
    Inventors: An Huang, Kai-Ge Liu, Xiang-Ming Ye
  • Patent number: 8750356
    Abstract: A method for measuring the asymmetric delay of a communication path includes: sending, by a first node, a first delay measurement message to a second node whose local clock is synchronized with the first node; receiving, by the first node, a second delay measurement message sent by the second node; calculating, according to time when the first delay measurement message is sent by the first node and time when the second node receives the first measurement message, a communication path delay in a direction towards the second node; calculating, according to time when the second node sends the second delay measurement message and time when the second measurement message is received by the first node, a communication path delay in a direction leaving the second node; and obtaining a measured value of the asymmetric delay of the communication path according to the communication path delays in the two directions.
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: June 10, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Song Wang
  • Patent number: 8749248
    Abstract: Signal egress from a shielding flaw in a cable telecommunication system is detected, even where signals carried by the cable telecommunication system are quadrature amplitude modulated signals that statistically resemble broadband noise by generating a marker signal comprising a double side band, suppressed carrier signal in the fringes of contiguous frequency bands and at a power level which cannot cause perceptible interference with signals in those contiguous frequency bands. The separation of the sidebands comprising the marker signal can unambiguously identify the marker signal and can distinguish between different cable telecommunication systems installed in the same geographic area. The marker signal can be additionally coded by varying the frequency and/or amplitude of the modulating signal used to create the marker signal.
    Type: Grant
    Filed: April 6, 2011
    Date of Patent: June 10, 2014
    Assignee: ConSonics, Inc.
    Inventors: John J. Murphy, Dennis A. Zimmerman
  • Patent number: 8750425
    Abstract: A method for identifying the modulation scheme of a software defined radio in real-time without pilot symbols between transmitters and receivers, includes providing a predetermined look-up table (LUT) in the software-defined radio wherein the LUT is prepared by pre-calculating discrete likelihood ratio test (DLRT) function values; storing the pre-calculated DLRT values in said LUT; and indexing the pre-calculated DLRT values by addresses.
    Type: Grant
    Filed: May 3, 2012
    Date of Patent: June 10, 2014
    Assignee: The United States of America, as represented by the Secretary of the Army
    Inventor: Wei Su
  • Publication number: 20140153625
    Abstract: Systems and methods for decoding block and concatenated codes are provided. These include advanced iterative decoding techniques based on belief propagation algorithms, with particular advantages when applied to codes having higher density parity check matrices. Improvements are also provided for performing channel state information estimation including the use of optimum filter lengths based on channel selectivity and adaptive decision-directed channel estimation. These improvements enhance the performance of various communication systems and consumer electronics. Particular improvements are also provided for decoding HD Radio signals, including enhanced decoding of reference subcarriers based on soft-diversity combining, joint enhanced channel state information estimation, as well as iterative soft-input soft-output and list decoding of convolutional codes and Reed-Solomon codes. These and other improvements enhance the decoding of different logical channels in HD Radio systems.
    Type: Application
    Filed: December 3, 2012
    Publication date: June 5, 2014
    Applicant: Digital PowerRadio, LLC
    Inventors: Branimir R. Vojcic, Farnaz Shayegh, Hakan Dogan, Wookwon Lee
  • Publication number: 20140153628
    Abstract: Systems and methods for decoding block and concatenated codes are provided, including channel state information estimation such as by using optimum filter lengths based on channel selectivity and adaptive decision-directed channel estimation. These improvements enhance the performance of various communication systems and consumer electronics, including HD Radio receivers and systems.
    Type: Application
    Filed: September 5, 2013
    Publication date: June 5, 2014
    Applicant: Digital PowerRadio, LLC
    Inventors: Branimir R. Vojcic, Hakan Dogan
  • Publication number: 20140153626
    Abstract: A method includes identifying, at a computing system executing a line test engine, a line to be tested by comparing a test entry of a test configuration database to a first database. The first database includes line data descriptive of multiple lines of a network. The method includes determining, at the computing system, a test to be performed on the line based on the test entry and sending a message from the computing system to a line test controller. The message indicates the line and the test to be performed on the line. The line test controller causes a test device to perform the test on the line. The method includes receiving a result message from the line test controller, wherein the result message indicates a result of the test.
    Type: Application
    Filed: December 5, 2012
    Publication date: June 5, 2014
    Applicant: AT&T Intellectual Property I, L.P.
    Inventors: Christopher Wilson, Keith Bertelsen, Bruce Losee, Kavitha Shankar
  • Publication number: 20140153624
    Abstract: Methods and systems are provided for detection of noise ingress into a network. In an aspect, multiple access devices on the network are analyzed for noise ingress. In another aspect, using characterization data of components in the network and the detection of the noise at the access devices, the location of the noise ingress can be determined.
    Type: Application
    Filed: December 3, 2012
    Publication date: June 5, 2014
    Applicant: Comcast Cable Communications, LLC
    Inventors: Lawrence Wolcott, Phillip Chang
  • Publication number: 20140153623
    Abstract: A device for auto baud rate detection includes an edge trigger, a counter, at least one register and a central processing unit. The edge trigger detects whether a potential of a transmitted signal is raising or falling. The counter is connected to the edge trigger and uses the edge trigger to count pulse widths of the transmitted signal. The register is connected to the counter and stores the pulse widths. The central processing unit is connected to the register, compares the pulse widths so as to identify a minimal pulse width, and calculates a baud rate according to the minimal pulse width by using a probability density function. Thereby, the device is advantageous for lowering hardware costs, increasing use flexibility, reducing configuration limitation and ensuring accurate baud rate detection.
    Type: Application
    Filed: November 30, 2012
    Publication date: June 5, 2014
    Applicant: DINKLE ENTERPRISE CO., LTD.
    Inventor: Ching Han CHEN
  • Patent number: 8743934
    Abstract: In a signal measurement device, a plurality of mixers output a signal having a frequency equal to a difference between two input frequencies, and a single local signal source feeds a common local signal input to the plurality of mixers. A difference measurement unit measures a level and a phase difference between outputs of the plurality of mixers if a common correction signal input is fed to the plurality of mixers, and a level/phase measurement unit measures the level and the phase of the output of the plurality of mixers if inputs of signal to be measured common in frequency are fed to the plurality of mixers. A difference correction unit corrects a measurement result of the level/phase measurement unit based on a measurement result of the difference measurement unit if a common input of signal to be measured is fed to the plurality of mixers.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: June 3, 2014
    Assignee: Advantest Corporation
    Inventors: Minoru Iida, Takashi Kimura
  • Patent number: 8743932
    Abstract: A discrete multitone transceiver (DMT) includes a deinterleaver operable to de-interleave a plurality of bits. The DMT further includes: a forward error correction decoder operable to decode the plurality of bits, a module operable to determine, during Showtime, an impulse noise protection value, wherein the impulse protection value specifies a number corrupted DMT symbols that can be corrected by the forward error correction decoder in combination with the deinterleaver, and a receiver coupled to the deinterleaver. The receiver receives using a first interleaver parameter value, receives a flag signal, and changes to receiving using a second interleaver parameter value that is different than the first interleaver parameter value, wherein the second interleaver parameter value is used for reception on a pre-defined forward error correction codeword boundary following reception of the flag signal.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: June 3, 2014
    Assignee: TQ Delta, LLC
    Inventor: Marcos C. Tzannes
  • Patent number: 8742777
    Abstract: Embodiments include a method and system for testing an electric circuit. A carrier signal of a first frequency is modulated with a multi-tone signal to generate a test signal. The test signal is applied to an input of a circuit under test (CUT). A crest factor of an output signal that corresponds to the test signal received at an output of the CUT is measured. A crest factor differential between the measured crest factor and a reference crest factor is determined. If the crest factor differential exceeds a threshold value, the CUT is determined to be defective.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: June 3, 2014
    Assignee: The Board of Trustees of the University of Alabama for and on behalf of the University of Alabama
    Inventors: Bruce C. Kim, Sukeshwar Kannan, Ganesh Srinivasan, Friedrich Taenzler
  • Patent number: 8743975
    Abstract: A method for receiving signals over a power line network, within the power line network at least one transmitter and at least one receiver communicate via at least two channels, each of the channels having a respective feeding port of the at least one transmitter and a respective receiving port of the at least one receiver, and the receiver having at least two receiving ports. The method determines a channel characteristic of each of the channels, applies a receiving port selection criterion based on the channel characteristic, and selects an excluded receiving port among the at least two receiving ports based on the receiving port selection criterion, the excluded receiving port is not used during further communication.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: June 3, 2014
    Assignee: Sony Corporation
    Inventors: Lothar Stadelmeier, Andreas Schwager, Daniel Schneider
  • Patent number: 8743935
    Abstract: In a wireless communication system performing wireless communication via a wireless transmission path, a first wireless communication apparatus includes a receiver that receives a wireless signal via a wireless transmission path, a disconnection detector that detects disconnection of a wireless line connected to a second communication apparatus, a modulation controller that selects a modulation scheme, enabling communication under poor conditions in a transmission path, rather than a modulation scheme which has been used in wireless communication, and a transmitter that notifies the modulation scheme selected by the modulation scheme controller to the second wireless communication apparatus. The second wireless communication apparatus includes a receiver that receives the selected modulation scheme from the first wireless communication apparatus, and a transmitter that transmits signals to the first wireless communication apparatus based on the selected modulation scheme which is received by the receiver.
    Type: Grant
    Filed: November 25, 2010
    Date of Patent: June 3, 2014
    Assignee: NEC Corporation
    Inventor: Koji Ikuta
  • Patent number: 8743938
    Abstract: A modem or associated computing or testing device is configured to detect the presence of one or more faults that affect DSL communications, and upon their detection, generate, for example, an indication, communication or message that recommends corrective action. In this context, a fault is generally caused by one or more unfiltered devices, impulsive noises, malfunctioning modems, or other factor that does not affect measured attenuation or measured noise, but does affect the signal-to-noise ratio (SNR) of the link. In addition to being able to generate a message guiding a user through corrective action, the system can estimate the rate impact of the detected fault.
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: June 3, 2014
    Assignee: Aware, Inc.
    Inventors: Christopher Cunningham, Jianming Zhu
  • Patent number: 8744368
    Abstract: An apparatus and method are disclosed for providing test mode contact pad reconfigurations that expose individual internal functional modules or block groups in an integrated circuit for testing and for monitoring. A plurality of switches between each functional module switches between passing internal signals among the blocks and passing in/out signals external to the block when one or more contact pads are strapped to input a pre-determined value. Another set of switches between the functional modules and input/output contact pads switch between functional inputs to and from the functional modules and monitored signals or input/output test signals according to the selected mode of operation.
    Type: Grant
    Filed: December 30, 2011
    Date of Patent: June 3, 2014
    Assignee: Broadcom Corporation
    Inventors: Love Kothari, James Bennett, Zhongmin Zhang
  • Publication number: 20140146864
    Abstract: In a method for detecting leakage in a digital cable system, at least one first signal is inserted on the cable system. The at least one first signal has an amplitude multiple tens of dB below the digital channel power of the digital channels carried on the cable system. A second signal containing the first signal is received. The second signal is converted to an intermediate frequency (IF) signal. The IF signal is digitized and samples of the digitized IF signal are obtained. Digitized samples of a third signal at the nominal frequency of the first signal at maximum amplitude converted to the IF are provided. The digitized IF signal and the digitized samples of a third signal at the nominal frequency of the first signal at maximum amplitude converted to the IF are correlated. The presence of the inserted first signal is detected based upon the result of the correlation. In another method, a pair of first signals are inserted on the cable system.
    Type: Application
    Filed: June 26, 2012
    Publication date: May 29, 2014
    Applicant: TRILITHIC, INC.
    Inventors: Raleigh Benton Stelle, IV, Dennis Lee Orndorff
  • Publication number: 20140146862
    Abstract: A process for performing a QR Decomposition of a channel matrix of a wireless communication channel system, said process involving the steps of: performing a full QR Decomposition of one channel matrix for the purpose of deriving a first QR representation of the channel; performing a second iterative QR Decomposition of an adjacent channel matrix, said second iterative QR Decomposition using the results of said first QR representation as well as the difference of the two adjacent channel matrices ?H. More particularly, the process is characterized in that the iterative QR Decomposition is performed in response to the detection of a high level of workload of the processor.
    Type: Application
    Filed: October 18, 2011
    Publication date: May 29, 2014
    Applicant: ST-ERICSSON SA
    Inventor: Sebastien Aubert
  • Publication number: 20140146863
    Abstract: A method of operating a Mobile Station (MS) in a wireless communication system using beamforming includes receiving a reference signal over a plurality of downlink transmit (Tx) beams, measuring channel quality information of the received reference signal, and generating effective channel quality information by compensating for beamforming gain compensation information according to the channel quality information.
    Type: Application
    Filed: November 25, 2013
    Publication date: May 29, 2014
    Applicant: Samsung Electronics Co., Ltd.
    Inventors: Ji-Yun Seol, Tae-Young Kim, Hyun-Kyu Yu
  • Publication number: 20140146865
    Abstract: An antenna can be in a computing device. A connector can be in the computing device and adjacent to the antenna for a wired connection. In one implementation the antenna is connector to a controller to monitor the antenna for wireless signal degradation and compensate for the wireless signal degradation.
    Type: Application
    Filed: November 29, 2012
    Publication date: May 29, 2014
    Applicant: Hewlett-Packard Development Company, L.P.
    Inventors: Isaac Lagnado, Timothy Neill
  • Patent number: 8737493
    Abstract: The presently disclosed subject matter relates to powerline communications (PLC) in an advanced metering infrastructure (AMI) environment. A communications signal is applied to a power line by a PLC transmitting device. A receiver is provided that evaluates communications signals based on the power coupled to the power line by the transmitting device. In one present embodiment, PLC signal voltage and current levels are multiplied together to evaluate signal power to reproduce received PLC signals.
    Type: Grant
    Filed: October 18, 2011
    Date of Patent: May 27, 2014
    Assignee: Itron, Inc.
    Inventors: Vladimir Borisov, Philippe Chiummiento
  • Patent number: 8737457
    Abstract: Techniques for directly adapting the parameters of a smoothing filter used for channel estimation to the current velocity and signal-to-noise ratio (SNR) situation. An example method begins with a plurality of channel response measurements. For each of a first subset of a set of pre-determined filter responses, the channel measurement samples are filtered to obtain a corresponding set of estimated channel response samples. Next, for each set of estimated channel response samples, a corresponding set of ordered residuals are calculated from the channel measurement samples. Each set of ordered residuals is evaluated to determine a measure of correlation among the ordered residuals, and an updated filter response is selected from a second subset of the set of pre-determined filter responses, based on this evaluation, for use in demodulating a received signal.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: May 27, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Andres Reial, Lennart Morén
  • Patent number: 8737922
    Abstract: The disclosure relates to a network node of a wireless network, and to a related method of controlling interference generated by at least one white space device controlled by the network node. The method comprises transmitting a request for information regarding channels available for secondary usage to the remote entity, and receiving information from the remote entity, the information indicating a channel available for secondary usage, a critical position associated with said channel, and an interference threshold for the critical position.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: May 27, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Tim Irnich, Jonas Kronander, Joachim Sachs
  • Publication number: 20140140382
    Abstract: Described are methods of determining imbalance in an IQ modulator. Example methods include applying a set of at least three test signals to the I channel and Q channel to generate an output, then receiving output from a frequency measuring device coupled to the IQ modulator. Some of the set of test signals may be substantially different than other test signals in the set. After the frequency specific output is received, the method measures one or more values and derives the imbalance in the IQ modulator from the measured values. Embodiments also include adjusting parameters of the test signals until a minimum distance is measured. A device is also described, which includes a test signal generator, an output analyzer, and a minimizer structured to cause the test signal generator to generate a set of test signals that cause a distance measured in the output to be a minimum distance.
    Type: Application
    Filed: November 21, 2012
    Publication date: May 22, 2014
    Applicant: TEKTRONIX, INC.
    Inventor: ZOLTAN D. AZARY
  • Patent number: 8731034
    Abstract: The present invention relates to a method, a computer readable medium, and a system of payload encoding and modulation and, more particularly, to a method, a computer readable medium, and a system of payload encoding and modulation for channel quality feedback. A method includes sending a Channel Quality Indicator (CQI) in a x-bit modulation scheme, and after sending the CQI, sending at least one CQI in a y-bit modulation scheme, the at least one CQI indicating one of an increment and a decrement of a previous CQI. The method further includes detecting a trigger event, and when the trigger event is detected, sending the CQI in the x-bit modulation scheme.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: May 20, 2014
    Assignee: Clearwire IP Holdings LLC
    Inventors: Sungki Park, Durga Prasad Satapathy
  • Patent number: 8731036
    Abstract: A clock synchronization system synchronizes a clock of a slave node with a clock of a master node. The master node includes a packet transmitting unit that transmits a packet including a time stamp (TS) to the slave node. The slave node includes: a packet receiving unit that receives the packet transmitted from the master node; a packet filter unit that calculates as a value of delay of the packet a difference between a TS on the clock of the slave node when the packet is received and the TS of the packet received, corrects the value of the delay of the packet or a threthold for the delay of the packet, and performs filter processing on the packet received from the packet receiving unit based on the value of the delay of the packet and the threshold for the delay of the packet; and a phase synchronization unit that outputs the clock of the slave node based on the TS included in the packet employed.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: May 20, 2014
    Assignee: NEC Corporation
    Inventors: Masaki Umayabashi, Zhenlong Cui, Kazuo Takagi