Unique Synchronization Word Or Unique Bit Sequence Patents (Class 370/514)
  • Patent number: 10637535
    Abstract: Aspects of the subject disclosure may include, a system for initiating, at a first start time, transmissions of first electromagnetic waves, ceasing transmission of the first electromagnetic waves after a first duration period that is less than a one-way travel time for signals to propagate between the first waveguide system and a second waveguide system via a physical transmission medium, and initiating, after the ceasing, reception of second electromagnetic waves from the second waveguide system that are initiated at a second start time and transmitted for a second duration period that is less than the one-way travel time. Other embodiments are disclosed.
    Type: Grant
    Filed: December 10, 2018
    Date of Patent: April 28, 2020
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Giovanni Vannucci, Paul Shala Henry, Thomas M. Willis, III
  • Patent number: 10581476
    Abstract: A communications device includes aspects for improving reception of transmissions with first-adjacent co-channel interference signals corresponding to digitally-modulated side-bands of in-band on-channel (IBOC) broadcasted signals. The communications device may include a radio frequency (RF) signal-reception circuit including two RF-signal paths driven in response to signals received via at least two respective antennas, and configured to respond to signals carried in the respective RF-signal paths by providing pre-processed RF output signals. The communications device may further include a beam-forming circuit driven in response to signals received at the at least two respective antennas and configured and arranged to facilitate first-adjacent interference cancellation (FAC).
    Type: Grant
    Filed: May 17, 2018
    Date of Patent: March 3, 2020
    Assignee: NXP B.V.
    Inventor: Wim van Houtum
  • Patent number: 10505706
    Abstract: A method in a node is disclosed. The method comprises receiving a signal, and obtaining a first oversampled received signal by sampling the received signal according to a symbol rate. The method further comprises estimating a first frequency offset based on the first oversampled received signal, the first frequency offset estimated using an estimation range limited to one of a bandwidth of the received signal or the symbol rate of the received signal, and obtaining a second oversampled received signal by sampling the received signal according to N times the symbol rate, wherein N is greater than 1. The method further comprises estimating a true frequency offset based on the first frequency offset estimate and the second oversampled received signal.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: December 10, 2019
    Assignee: Guangdong OPPO Mobile Telecommunications Corp., Ltd.
    Inventors: Ansuman Adhikary, Niklas Johansson, Yi-Pin Eric Wang
  • Patent number: 10454617
    Abstract: An optical frame is received over an optical link within an optical network. The optical frame contains a payload of aggregated data, an alignment value, and a bit interleaved parity value. The content of the optical frame is aligned based on the alignment value. The bit interleaved parity value is monitored. In response to the monitoring, a transmission quality of the transmission link is determined.
    Type: Grant
    Filed: October 9, 2017
    Date of Patent: October 22, 2019
    Assignee: Cisco Technology, Inc.
    Inventors: Gilberto Loprieno, Davide Codella
  • Patent number: 10326633
    Abstract: A wireless device detects a synchronization signal by obtaining (210), from a received signal, a sequence of samples, and calculating (220) a differentially decoded sequence from the obtained sequence of samples. The wireless device correlates (230) the calculated differentially decoded sequence with a first reference sequence corresponding to the synchronization signal, at each of a plurality of time offsets, and identifies which of the plurality of time offsets results in a largest correlation result. In response to determining (240) that the largest correlation result does not meet a predetermined reliability criterion, the wireless device correlates (250) the obtained sequence of samples with a second reference sequence, at each of a plurality of time and frequency offsets, and identifies which combination of time offset and frequency offset results in a largest correlation result. The first reference sequence comprises a differentially decoded version of the second reference sequence.
    Type: Grant
    Filed: June 29, 2016
    Date of Patent: June 18, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Andres Reial, Johan Axnäs, Johan Rune, Henrik Sahlin
  • Patent number: 10284358
    Abstract: An embodiment generates a composite high speed clock with embedded frame synchronization using simple digital encoding of a high speed reference clock. The high speed reference clock and self-aligned frame synchronization signal are recovered by standard logic gate circuitry. The encoding and decoding circuits are comprised of basic digital logic gates with low propagation delay skew and timing jitter. The encoded clock is easier to transmit from source unit to destination unit over common transmission media (i.e., digital transceivers, amplifiers, splitters, connectors and coaxial cable) because only a single interface is required and because the encoding scheme reduces the composite clock to a minimal transmission bandwidth with constrained waveform harmonic content, relative to a low frequency frame sync with fast rise time that requires a broadband transmission media.
    Type: Grant
    Filed: March 24, 2017
    Date of Patent: May 7, 2019
    Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: Cyrus Dhalla, Jonathan Krauss, Scott M. Takahashi, Gerald R. Fischer, Douglas S. Cockfield, Akop Gazdzhyan
  • Patent number: 10164793
    Abstract: Systems and methods for interoperating between real time networks. Systems may include a plurality of ports and switch circuitry coupled to the plurality of ports. At least one port may be coupled to a first real time network carrying first traffic. One or more other ports may be coupled to a second real time network carrying second traffic. Switch circuitry may route packets between the first real time network and the one or more second real time networks based on a mapping. Routing information may be inserted in packets routed from the one or more second real time networks to the first real time network and routing information may be removed from the packets routed from the first real time network to the one or more second real time networks. Packets may be routed based on the mapping to distinct queues for the first and second traffic.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: December 25, 2018
    Assignee: NATIONAL INSTRUMENTS CORPORATION
    Inventors: Sundeep Chandhoke, Rodney W. Cummings, Changzhe Gao, Brian Keith Odom
  • Patent number: 10096582
    Abstract: Presented herein is a method and apparatus for enhanced power distribution to application specific integrated circuits (ASICs). The apparatus includes a substrate, an ASIC, and a voltage regulator module. The substrate includes a first side, a second side, and a vertical interconnect access (via) extending between the first side and the second side. The ASIC is mounted on the first side of the substrate in alignment with the via. The voltage regulator module is mounted on the second side of the substrate in alignment with the via so that the voltage regulator module is electrically coupled to the ASIC through the via.
    Type: Grant
    Filed: July 8, 2016
    Date of Patent: October 9, 2018
    Assignee: Cisco Technology, Inc.
    Inventors: Paul L. Mantiply, Straty Argyrakis
  • Patent number: 9942026
    Abstract: A method in a node is disclosed. The method comprises receiving a signal, and obtaining a first oversampled received signal by sampling the received signal according to a symbol rate. The method further comprises estimating a first frequency offset based on the first oversampled received signal, the first frequency offset estimated using an estimation range limited to one of a bandwidth of the received signal or the symbol rate of the received signal, and obtaining a second oversampled received signal by sampling the received signal according to N times the symbol rate, wherein N is greater than 1. The method further comprises estimating a true frequency offset based on the first frequency offset estimate and the second oversampled received signal.
    Type: Grant
    Filed: January 22, 2016
    Date of Patent: April 10, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Ansuman Adhikary, Niklas Johansson, Yi-Pin Eric Wang
  • Patent number: 9853768
    Abstract: A system for compensating wire characteristics includes a transmission pre-emphasis module of a transmission transceiver that sends high level pre-emphasis training bits and low level pre-emphasis training bits along a wired connection, a reception pre-emphasis module of a receiver that receives the high level pre-emphasis training bits and low level pre-emphasis training bits along the wired connection, a pre-emphasis analysis module of the receiver that analyzes the high level pre-emphasis training bits and low level pre-emphasis training bits to determine a pre-emphasis level. The system further includes a controller that interfaces with the transmission transceiver and the receiver, the controller communicates the pre-emphasis level to the transmission transceiver.
    Type: Grant
    Filed: April 28, 2016
    Date of Patent: December 26, 2017
    Assignee: CARRIER CORPORATION
    Inventor: Donald J. Munn
  • Patent number: 9647827
    Abstract: An apparatus comprises a photonic oscillator circuit configured to generate optical signals that are separated by a uniform delay; radio frequency (RF) generating circuitry configured to receive the optical signals and produce a series of reference clock signals having a same clock signal frequency, wherein each reference clock signal in the series includes a uniform delay from a previous clock signal in the series; and a plurality of analog-to-digital converter (ADC) circuits, wherein an ADC circuit includes a signal input to directly receive an RF input signal that is continuous in time and amplitude, and a clock input to receive a reference clock signal of the repeating series of reference clock signals, wherein the ADC circuits are configured to sample a RF input signal at the frequency of the reference clock signal with the uniform delay to sample interleaved digital values representing the RF signal.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: May 9, 2017
    Assignee: Raytheon Company
    Inventors: Steven R. Wilkinson, Bishara Shamee
  • Patent number: 9497272
    Abstract: A system that enables a person to monitor and/or control a device via a network, such as the Internet, via an interactive hardware module that interfaces with the device and communicates with a module server located locally or remotely from the placement of the module. The hardware module allows for the transmission and receipt of data between the device interfaced to the hardware module and the module server, thereby enabling the user manually or automatically to control or monitor the device via an access medium, such as an API.
    Type: Grant
    Filed: December 30, 2013
    Date of Patent: November 15, 2016
    Assignee: ioBridge, Inc.
    Inventors: Jason Thomas Winters, Il Park, Peter Hans Scharler
  • Patent number: 9462563
    Abstract: Methods (100) and apparatuses (12, 24, 38) taught herein advantageously facilitate use of timing measurements in wireless communication networks (10) where radio signal timing measurements involve signals at different carrier frequencies. The methods and apparatuses in particular compensate such timing measurements for expected discrepancies in the measurements that arise from frequency-dependent differences in the propagation behavior of the radio signals being measured. In a non-limiting example, measurements at two or more frequencies may be compensated for the frequency distance between those frequencies, or with respect to a reference frequency. In such cases, timing measurements determined for one or more other radio signals are compensated as a function of the frequency distance between the reference frequency and the frequencies of such other radio signals.
    Type: Grant
    Filed: August 2, 2011
    Date of Patent: October 4, 2016
    Assignee: Optis Cellular Technology, LLC
    Inventors: Iana Siomina, Muhammad Kazmi
  • Patent number: 9450705
    Abstract: Embodiments of the present invention provide a system that identifies an even delimiter in a forward error correction (FEC)-coded Ethernet frame. The system receives an FEC-coded Ethernet frame that includes the even delimiter, which is a predetermined sequence that separates a conventional Ethernet frame and FEC parity bits in the FEC-coded Ethernet frame. Next, the system scans a bit stream of the FEC-coded Ethernet frame. Then, the system determines a first Hamming distance between a first consecutive set of frame bits in the bit stream and the even delimiter. The system also determines a second Hamming distance between a second consecutive set of frame bits in the bit stream and the even delimiter. Both the first and second Hamming distances are shorter than a predefined value. The system subsequently selects one of the first and second sets of frame bits having the shorter Hamming distance as the even delimiter.
    Type: Grant
    Filed: July 1, 2010
    Date of Patent: September 20, 2016
    Assignee: Broadcom Corporation
    Inventor: Ryan E. Hirth
  • Patent number: 9438411
    Abstract: A method and system for synchronizing digital messages. A digital message includes a start-of-message indicator, followed by a key word, followed by the message payload. Before transmitting the digital message, the payload is combined in an exclusive-OR operation with the key word, which is chosen from a pre-designated pool of key words. Each pool represents a message of different type, which is type is related to word length. The key word and start-of-message indicator are appended to the resulting exclusive-OR digital message and transmitted. On receipt, the start-of-message indicator indicates the start of the message, and the key word determines the message word length and, after a second exclusive-OR operation with the key word, restores the original digital message. The start of the message is positively identified without additions to the message payload and without the key word ever appearing in the payload during transmission.
    Type: Grant
    Filed: August 12, 2015
    Date of Patent: September 6, 2016
    Assignee: THE BOEING COMPANY
    Inventors: Brian C Lojeck, Albert A Williams
  • Patent number: 9391857
    Abstract: Apparatus and method for scheduling requests for data transfers in a multi-device storage system. In some embodiments, a system includes at least one server coupled to a pool of storage devices to transfer data from the storage devices to client devices responsive to requests. A request scheduler is adapted to receive into a memory a plurality of requests each having a service identifier (ID) and a payload size, to set a deadline for each request responsive to the service ID and the payload size, to forward the requests to the server for processing in an order based on service ID and, responsive to the deadline being reached for a selected request, to advance the selected request for immediate processing by the server.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: July 12, 2016
    Assignee: Seagate Technology LLC
    Inventor: Ganesan Umanesan
  • Patent number: 9351176
    Abstract: A method and apparatus for tracking amplitude and phase of a received low frequency signal comprising a walking pilot signal is disclosed, wherein the pilot signal changes in frequency a number of times according to a sequence that repeats. The design includes initializing a FIFO buffer and summing estimated channel power over the sequence to determine an initial total power. The design also includes, for a new received symbol, determining an updated power estimate for the new received symbol, placing the updated power estimate in the FIFO buffer, and removing a least current value from the FIFO buffer, and estimating amplitude of the signal using a sum of all updated power estimates in the FIFO buffer divided by the initial total power. The design may further include determining a delta phase value using maximum ratio combining scaled with a scaling factor.
    Type: Grant
    Filed: January 7, 2013
    Date of Patent: May 24, 2016
    Assignee: QUALCOMM Incorporated
    Inventors: Tao Tian, Sameer Vermani, Lin Yang, Albert van Zelst
  • Patent number: 9306733
    Abstract: A method of synchronizing a time division duplex (TDD) multi-line, multi-carrier data communication system is provided. Synchronization is established using unique pseudo-random bit sequences (PRBS) from a common generator polynomial having different seed values. Due to low correlation of PRBS generated with different seed values, a remote unit can only synchronize to its intended signal effectively mitigating far-end and near-end crosstalk impact of large bandwidth very high speed digital subscriber lines (VDSL).
    Type: Grant
    Filed: November 27, 2013
    Date of Patent: April 5, 2016
    Assignee: BROADCOM CORPORATION
    Inventors: Kevin Zhifang Du, Brian Robert Wiese, Michael Eugene Locke, Richard Glentworth Greenfield
  • Patent number: 9252900
    Abstract: Various embodiments are described herein related to techniques for synchronizing a slave device to a master device that communicates using a unified bus communication protocol or some aspect thereof. In one example, the method may comprise assuming a first mode of operation for the unified bus communication protocol; searching for a synchronization pattern at one or more locations in transmitted data according to the first mode of operation; obtaining synchronization when the located synchronization pattern is verified according to at least one synchronization rule for the mode of operation; and if synchronization is not obtained based on the assumed first mode of operation, a second mode of operation for the unified bus communication protocol is assumed and the searching and obtaining acts are carried out on the transmitted data according to the second mode of operation.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: February 2, 2016
    Assignee: BlackBerry Limited
    Inventor: Jens Kristian Poulsen
  • Patent number: 9185440
    Abstract: An information transmission method capable of reproducing the atmosphere of a concert hall or a live performance hall, wherein bio-information of a speaker, player, actor or conductor, who serves as a source of speech, sounds or music and/or bio-information of a performer included within an image are multiplexed with respect to information of speech or music and/or information of the image for transmission thereof. At the receiving side, sense stimulation based on the bio-information is provided to the viewer, or information of speech or music and/or information of the image are controlled on the basis of the bio-information to thereby reproduce presence or live appeal.
    Type: Grant
    Filed: December 20, 2011
    Date of Patent: November 10, 2015
    Assignee: SONY CORPORATION
    Inventors: Yoichiro Sako, Masayoshi Miura, Susumu Yabe, Motoyuki Takai, Akiko Inoue
  • Patent number: 9172458
    Abstract: A method of providing a high symbol rate communication system with reduced overhead bandwidth includes calculating a minimum feasible aperture length at a network operations center, setting a hub demodulator subsystem to use an aperture length calculated from the minimum feasible aperture length, broadcasting the aperture length to a VSAT, and receiving an inroute data stream from the VSAT utilizing the aperture length.
    Type: Grant
    Filed: October 14, 2010
    Date of Patent: October 27, 2015
    Assignee: Hughes Network Systems, LLC
    Inventors: Roderick Ragland, Nimesh Ambeskar, Michael Pierce
  • Patent number: 9054850
    Abstract: Embodiments of the present invention provide a method and a device for sending data in a passive optical network. A central office processing device records a downstream superframe number of a downstream data frame. A loop delay between the central office processing device and a terminal processing device is obtained according to the recorded downstream superframe number in combination with an upstream superframe number and an upstream frame synchronization sign in an upstream channel-associated data frame sent by the terminal processing device, so that the central office processing device may, after subtracting the loop delay, accurately determine, by using cached bandwidth map information and an obtained equalization delay of the terminal processing device, a start time point and an end time point for sending an upstream service data frame to an optical line terminal.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: June 9, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Kai Dui, Guang Xie
  • Patent number: 9036539
    Abstract: The exemplary embodiment of the present invention provides a method of synchronizing a femtocell base station securing time synchronization of a femtocell base station by allowing the femtocell base station to transmit a symbol to a terminal belonging to the femtocell by performing the time synchronization with a preamble signal when the femtocell base station receives the preamble signal from the macrocell base station in an orthogonal frequency division multiple access (OFDMA) communication system in which a femtocell is present in a macrocell.
    Type: Grant
    Filed: September 16, 2009
    Date of Patent: May 19, 2015
    Assignee: Intellectual Discovery Co., Ltd.
    Inventors: Kwang Soon Kim, Young Jin Sang
  • Patent number: 9036759
    Abstract: A method performed by a device for performing synchronization between devices for a Device-to-Device (D2D) communication is provided. The method includes setting, according to a process of the device, the device to a group of devices for performing a dynamic switching; outputting a synchronization signal corresponding to the set group as a signal for setting synchronization in a physical layer; controlling, upon receiving another synchronization signal from another device, the outputting of the synchronization signal by applying a time offset according to a relation between the set group that includes the device and the group that includes the another device; and setting, if the synchronization signal and the another synchronization signal are converged, synchronization of the device based on a time point where the synchronization signal is output.
    Type: Grant
    Filed: October 24, 2012
    Date of Patent: May 19, 2015
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Seung-Hoon Park, Chi-Woo Lim, Nam-Yoon Lee, Kyung-Kyu Kim
  • Publication number: 20150131683
    Abstract: A receiver includes first, second, and third signal processors and a controller. The first signal processor provides a first signal in response to detecting a first attribute of a received signal. The second signal processor provides a second signal in response to detecting a second attribute of the received signal. The third signal processor provides a third signal in response to detecting a third attribute of the received signal and provides packet data. The controller enables the first signal processor in response to a receive enable signal, controls the third signal processor to provide the packet data in response to receiving the first signal and the third signal, and initializes the first signal processor and the third signal processor in response to receiving the first signal and the second signal.
    Type: Application
    Filed: November 14, 2013
    Publication date: May 14, 2015
    Applicant: Silicon Laboratories Inc.
    Inventors: Hendricus de Ruijter, Wentao Li
  • Patent number: 9031096
    Abstract: A multimedia data system comprising a synchronization unit. The synchronization unit receives a demodulated bitstream, checks whether a FAW pattern corresponding to a candidate of the bitstream exists, checks whether an additional information corresponding to the candidate of the bitstream is valid when the FAW pattern exists, determines a hit weighting corresponding to the candidate according to the checking result, determines whether the hit weighting meets a criterion and outputs a synchronization signal when the hit weighting meets the criterion.
    Type: Grant
    Filed: September 24, 2007
    Date of Patent: May 12, 2015
    Assignee: MediaTek Inc.
    Inventors: Hsing-Ju Wei, Chien-Hua Hsu, Po-Wen Ku
  • Patent number: 9014213
    Abstract: Under a wireless communication environment in which nodes sharing a time reference communicate information with a frame having a predetermined structure, when a node that has failed to acquire synchronization, a protocol in which neighboring nodes relays synchronization to the synchronization acquisition failed node by using a preamble defined in the frame is provided.
    Type: Grant
    Filed: September 28, 2011
    Date of Patent: April 21, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Choongil Yeh, Dong Hyun Ahn
  • Patent number: 9014214
    Abstract: A receiving-side chip is disclosed according to the present invention, which includes a processor, configured to acquire and execute following instructions: receiving link information sent by a sending-side chip, and enabling, according to the link information, a SerDes link to be added; receiving padding data from the added SerDes link according to a short unit frame period to acquire a synchronization word, and determining, according to the synchronization word, whether the added SerDes link has been synchronized; switching a read period of data in the added SerDes link from the short unit frame period into a long unit frame period, and aligning the data of the added SerDes link with the data of an original SerDes link; and receiving service data over the added SerDes link and the original SerDes link.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: April 21, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yongjie Shi, Tao Lin, Shuangwu Xu, Yanxi Zhang
  • Patent number: 9001903
    Abstract: A communication system includes a first communication device and a second communication device for performing power line communication using a power line as a transmission line with the first communication device, and in the communication system, the first communication device includes a detection mechanism for detecting a zero crossing timing of a commercial power supply and transmitting mechanism for transmitting a transmission signal modulated in OFDM mode at the zero crossing timing, the transmitting mechanism first transmits a header signal having a preamble as the transmission signal when the power line communication is started, and the transmitting mechanism transmits a data signal having no preamble as the transmission signal after the header signal is transmitted, and the second communication device includes a receiving mechanism for performing a demodulation process on the transmission signal which is received, to thereby obtain receiving data.
    Type: Grant
    Filed: March 8, 2012
    Date of Patent: April 7, 2015
    Assignee: MegaChips Corporation
    Inventor: Eiji Baba
  • Patent number: 8982998
    Abstract: A transmission apparatus includes a plurality of orthogonal frequency division multiplexing (OFDM) modulation signal generators, which generate a first OFDM modulation signal and a second OFDM modulation signal. The transmission apparatus also includes a transmitter that transmits the first OFDM modulation signal from a first antenna and the second OFDM modulation signal from a second antenna, in an identical frequency band.
    Type: Grant
    Filed: March 3, 2014
    Date of Patent: March 17, 2015
    Assignee: Panasonic Intellectual Property Corporation of America
    Inventors: Yutaka Murakami, Masayuki Orihashi, Akihiko Matsuoka
  • Publication number: 20140369366
    Abstract: On the basis of single-ended signals based on logic levels, and of differential, in particular common-mode-based, signals, a circuit arrangement and a corresponding method are proposed, in which a serialized signal transmission is always performed in an error-free and stable manner.
    Type: Application
    Filed: February 14, 2014
    Publication date: December 18, 2014
    Applicant: SILICON LINE GMBH
    Inventors: Thomas BLON, Thomas SUTTORP, Holger HOELTKE
  • Patent number: 8913705
    Abstract: A mechanism for dynamic skew correction in a multi-lane communication link includes a receiver unit including, for each of the lanes, a first-in first-out (FIFO). The FIFO may store received symbols to locations pointed to by a write pointer and output to downstream logic, symbols stored at locations pointed to by a read pointer. The receiver may also include a symbol drop unit that disables the write pointer in response to receiving a start alignment symbol, and enables the write pointer in response to receiving an end alignment symbol. The receiver also includes an alignment unit that disables the read pointer in response to detecting that the end symbol has been received at least one lane but not all lanes. In addition, the alignment unit may enable the read pointer in response to a determination that the end symbol has been received on all lanes.
    Type: Grant
    Filed: August 27, 2012
    Date of Patent: December 16, 2014
    Assignee: Oracle International Corporation
    Inventor: Bruce J. Chang
  • Patent number: 8902935
    Abstract: Provided are a synchronization acquisition method and apparatus in a multi-carrier system. A terminal acquires the synchronization for a first downlink component carrier by detecting a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in the first downlink component carrier. The terminal acquires the synchronization for a second downlink component carrier by detecting a reference signal in the second downlink component carrier.
    Type: Grant
    Filed: June 21, 2010
    Date of Patent: December 2, 2014
    Assignee: LG Electronics Inc.
    Inventors: So Yeon Kim, Han Gyu Cho, Jae Hoon Chung, Sung Ho Moon, Seung Hee Han, Yeong Hyeon Kwon
  • Patent number: 8879643
    Abstract: Low latency and computationally efficient techniques may be employed to account for errors in data such as low bit-width, oversampled data. In some aspects these techniques may be employed to mitigate audio artifacts associated with sigma-delta modulated audio data. In some aspects an error may be detected in a set of encoded data based on an outcome of a channel decoding process. Upon determining that a set of data may contain at least one error, the set of data may be replaced with another set of data that is based on one or more neighboring data sets. For example, in some aspects a set of data including at least one bit in error may be replaced with data that is generated by applying a cross-fading operation to neighboring data sets. In some aspects a given data bit may be flipped as a result of a linear prediction operation that is applied to PCM equivalent data that is associated with the given data bit and its neighboring data bits.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: November 4, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Harinath Garudadri, Somdeb Majumdar, David Jonathan Julian, Chinnappa K. Ganapathy
  • Patent number: 8879674
    Abstract: An approach is provided for correlation of a signal over time and frequency. The signal is correlated with a bit sequence over time instances and certain frequency offsets, wherein sub-segments of the signal are correlated with sub-segments of the bit sequence to generate a correlation factor associated with each signal sub-segment. The correlation factors are coherently combined to generate a final correlation factor, wherein a respective phase shift (for each frequency offset) is applied to each correlation factor to generate a set of frequency adjusted correlation factors, and the frequency adjusted correlation factors of a respective set are combined to generate the final correlation factor over the signal sub-segments, resulting in the matrix of final correlation factors over time and frequency. A signal parameter estimation is performed, based on the matrix of final correlation factors, to determine a highest correlation value for the signal over the frequency offsets.
    Type: Grant
    Filed: April 10, 2013
    Date of Patent: November 4, 2014
    Assignee: Hughes Network Systems, LLC
    Inventor: Neal Becker
  • Patent number: 8837368
    Abstract: A transmission method of a femtocell includes the following steps. The femtocell receives and temporarily stores multiple real-time transport protocol (RTP) packets from a UE in a buffer. When the RTP packets are temporarily stored for a time period, the femtocell samples the buffer at a sampling rate to generate multiple CS data packets. The CS data packets include a current CS data packet. When there exists no previous CS data packet received from the UE, the femtocell calculates a timestamp of the current CS data packet according to a current timestamp. When there exists the previous CS data packet, the femtocell calculates the timestamp of the current CS data packet according to the timestamp and a connection frame number (CFN) of the previous CS data packet and a CFN of the current CS data packet.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: September 16, 2014
    Assignee: Sernet (Suzhou) Technologies Corporation
    Inventors: Ling Zhu, Chao-Yang Sun
  • Patent number: 8824612
    Abstract: Apparatuses, circuits, and methods are disclosed for reducing or eliminating unintended operation resulting from metastability in data synchronization. In one such example apparatus, a sampling circuit is configured to provide four samples of a data input signal. A first and a second of the four samples are associated with a first edge of a latching signal, and a third and a fourth of the four samples are associated with a second edge of the latching signal. A masking circuit is configured to selectively mask a signal corresponding to one of the four samples responsive to the four samples not sharing a common logic level. The masking circuit is also configured to provide a decision signal responsive to selectively masking or not masking the signal.
    Type: Grant
    Filed: April 10, 2012
    Date of Patent: September 2, 2014
    Assignee: Micron Technology, Inc.
    Inventor: Yantao Ma
  • Patent number: 8804772
    Abstract: A base station transmits on a first control channel first scheduling information for a control message. First radio resources of the first control channel start from the first symbol of each subframe in a plurality of subframes. The base station transmits the control message configuring second radio resources of a second control channel. The second radio resources comprise resource blocks in a subset of subframes in the plurality of subframes. The control message indicates the subset of subframes and a starting symbol of the second control channel. The base station transmits second scheduling information on the second control channel.
    Type: Grant
    Filed: September 3, 2013
    Date of Patent: August 12, 2014
    Assignee: Ofinno Technologies, LLC
    Inventor: Esmael Hejazi Dinan
  • Patent number: 8804037
    Abstract: Systems, methods, and processor readable media are disclosed for encoding and transmitting first media content and second media content using a digital radio broadcast system, such that the second media content can be rendered in synchronization with the first media content by a digital radio broadcast receiver. The disclosed systems, methods, and processor-readable media determine when a receiver will render audio and data content that is transmitted at a given time by the digital radio broadcast transmitter, and adjust the media content accordingly to provide synchronized rendering. In exemplary embodiments, these adjustments can be provided by: 1) inserting timing instructions specifying playback time in the secondary content based on calculated delays; or 2) controlling the timing of sending the primary or secondary content to the transmitter so that it will be rendered in synchronization by the receiver.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: August 12, 2014
    Assignee: iBiquity Digital Corporation
    Inventors: Steven Andrew Johnson, Muthu Gopal Balasubramanian, Harvey Chalmers, Jeffrey Ranken Detweiler, Albert Gambardella, Russell Iannuzzelli, Stephen Douglas Mattson
  • Patent number: 8804892
    Abstract: A clock and data recovery device receives a serial data stream and produces recovered clock and data signals. The clock and data recovery device operates over a range of frequencies and without use an external reference clock. A first loop supplies a first clock signal to a second loop. The second loop modifies the first clock signal to produce the recovered clock signal and uses the recover clock signal to produce the recovered data signal. The first loop changes the frequency of the first clock signal based on frequency comparison and data transition density metrics.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: August 12, 2014
    Assignee: Vitesse Semiconductor Corporation
    Inventor: Ian Kyles
  • Patent number: 8792473
    Abstract: A method of synchronizing a plurality of data streams. A land mobile radio (LMR) data stream can be generated by a LMR communication device. At least one LMR identifier can be communicated from the LMR communication device to a broadband communication device. A broadband data stream can be generated by the broadband communication device. The broadband data stream and the LMR identifier can be communicated from the broadband communication device via an access network. The LMR identifier can enable synchronization of the LMR data stream with the broadband data stream.
    Type: Grant
    Filed: December 18, 2008
    Date of Patent: July 29, 2014
    Assignee: Motorola Solutions, Inc.
    Inventors: Tyrone D. Bekiares, Gregory D. Bishop, James A. Marocchi, Hemang F. Patel, Peter E. Thomas
  • Patent number: 8769368
    Abstract: The present invention discloses a method and system for detecting the frame boundary of a data stream received in Forward Error Correction layer in the Ethernet. The present invention can increase the speed of frame boundary detection and the speed of frame synchronization without adding any overheads of hardware.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: July 1, 2014
    Assignee: International Business Machines Corporation
    Inventors: Yin He, Yi Fan Lin, Yang Liu, Hao Yang
  • Patent number: 8730855
    Abstract: A method for detecting a channel in a mixed-mode communications system is presented. The channel contains a primary synchronization pattern in a predetermined location within the channel. The primary synchronization pattern is compared against different predetermined channel synchronization patterns to detect a channel. Upon detection of the channel, a look-back channel detector confirms the existence of the channel by using the location of the primary synchronization pattern. Detection and confirmation of the channel may be employed simultaneously to each channel of a multiple-channel direct mode of operation signal. Audio holes may be eliminated in a 2:1 TDMA direct mode operation where both time slots contain signals from two different originating communication devices and the signals have different priority.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: May 20, 2014
    Assignee: Motorola Solutions, Inc.
    Inventors: Hun Weng Khoo, Yueh Ching Chung, David G. Wiatrowski
  • Patent number: 8717972
    Abstract: The present invention provides a method for range extension is wireless communication systems. One embodiment of the method includes determining whether a mobile unit is within a first range corresponding to a range of timing advances supported by a timing advance command. This embodiment also includes transmitting a plurality of timing advance commands to the mobile unit when the mobile unit is outside the first range so that the mobile unit can synchronize with the base station by combining information in the plurality of timing advance commands.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: May 6, 2014
    Assignee: Alcatel Lucent
    Inventors: Fang-Chen Cheng, Jung Ah Lee
  • Patent number: 8711990
    Abstract: A system including a demodulation module, a metric generation module, and a preamble detection module. The demodulation module is configured to generate demodulated signals based on demodulating, in accordance with a differential demodulation scheme, signals received from a base station. The signals received from the base station include a plurality of symbols. The demodulated signals comprise a plurality of real parts each having a corresponding magnitude. The metric generation module is configured to generate a plurality of metrics for the plurality of symbols based on the corresponding magnitudes of the plurality of real parts of the demodulated signals. The preamble detection module is configured to detect, based on the plurality of metrics, whether the plurality of symbols in the signals received from the base station includes a preamble symbol.
    Type: Grant
    Filed: April 29, 2013
    Date of Patent: April 29, 2014
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Qing Zhao
  • Patent number: 8711836
    Abstract: Apparatus and methods relating to synchronization of communication equipment are disclosed. Synchronization information received from a bonded communication link can be used to synchronize local and/or remote communication equipment, such as femtocell sites coupled to nodes in a ring network. This may involve isolating a frequency reference signal from a DSL (Digital Subscriber Line) communication link which is a constituent link of a bonded communication link, for example. In a ring network, received synchronization information could be used in synchronizing a locally connected installation of communication equipment, and passed for transmission in the ring network for synchronizing other communication equipment. Such dropping and passing of an analog frequency reference signal could be applied in networks having other topologies as well. At least some embodiments of the invention are applicable to optical links.
    Type: Grant
    Filed: July 13, 2009
    Date of Patent: April 29, 2014
    Assignee: Genesis Technical Systems Corp.
    Inventors: Stephen P. Cooke, Tino Zottola
  • Patent number: 8705579
    Abstract: A data Interface for transferring digital data between a host and a client over a communication path using packet structures linked together to form a communication protocol for communicating a pre-selected set of digital control and presentation data. The signal protocol is used by link controllers configured to generate, transmit, and receive packets forming the communications protocol, and to form digital data into one or more types of data packets, with at least one residing in the host device and being coupled to the client through the communications path. The interface provides a cost-effective, low power, bi-directional, high-speed data transfer mechanism over a short-range “serial” type data link, which lends itself to implementation with miniature connectors and thin flexible cables which are especially useful in connecting display elements such as wearable micro-displays to portable computers and wireless communication devices.
    Type: Grant
    Filed: June 2, 2004
    Date of Patent: April 22, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Jon James Anderson, Brian Steele, George Alan Wiley, Shashank Shekhar
  • Patent number: 8705656
    Abstract: A transmission apparatus includes a plurality of orthogonal frequency division multiplexing (OFDM) modulation signal generators, which generate a first OFDM modulation signal and a second OFDM modulation signal. The transmission apparatus also includes a transmitter that transmits the first OFDM modulation signal from a first antenna and the second OFDM modulation signal from a second antenna, in an identical frequency band.
    Type: Grant
    Filed: April 18, 2013
    Date of Patent: April 22, 2014
    Assignee: Panasonic Corporation
    Inventors: Yutaka Murakami, Masayuki Orihashi, Akihiko Matsuoka
  • Patent number: 8700794
    Abstract: A video transmission method is provided, which includes receiving state information from at least one mobile terminal that intends to perform a video stream service through a wireless network, determining a size of an image by selecting a specified spatial layer bit stream on the basis of the state information of the mobile terminal from a plurality of spatial layer bit streams generated at different bit rates during encoding of the bit stream, selecting a specified time and an SNR layer bit stream by increasing or decreasing time of the image and a layer position of the SNR layer bit stream on the basis of network parameters included in the state information of the mobile terminal, and transmitting the bit stream generated by extracting the specified layer bit stream of the selected layer to the mobile terminal.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: April 15, 2014
    Assignees: Samsung Electronics Co., Ltd., Korea University Research and Business Foundation
    Inventors: Sung-Kee Kim, Tae-Sung Park, Sung-Jae Ko, Hyeong-Min Nam
  • Patent number: 8693524
    Abstract: A synchronization method for impulse system ultra-wideband takes frame as basic unit for data transmission, each frame is divided into a preamble symbol part and a data part, wherein the preamble symbol part sends a known impulse sequence for channel estimation and synchronization; the data part takes the information to be transmitted; the preamble symbol part is divided into two parts of a positive and negative impulse sequence, which includes odd impulses with alternant positive and negative polarities, and a same direction impulse sequence, which is composed of impulses with same polarity and is the same as the polarity of the last impulse in the positive and negative impulse sequence. The method provides such advantages as high synchronization precision, small storage space, and capability of immediately finding out the synchronization position etc., and provides an important value for the development of the impulse system ultra-wideband wireless communication technique.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: April 8, 2014
    Assignee: Southeast University
    Inventors: Zaichen Zhang, Liang Wu, Xutao Yu, Guangguo Bi, Xiaohu You