Plurality Of Synchronization Words Patents (Class 375/366)
  • Patent number: 10382144
    Abstract: Example systems, methods, and devices for mitigating interference in wireless networks are discussed. One example method includes the operations of passing channel frequency offsets of a plurality of LTF symbols on a plurality of subcarriers through a high pass frequency band, encoding the plurality of LTF symbols with a plurality of LTF sequences across frequency, and encoding the LTF symbols in time and/or frequency. Another example includes the operations of receiving a plurality of LTF symbols on a plurality of subcarriers for channel estimation of one or more streams, removing the encoding across time, removing the encoding across frequency, and removing the LTF sequence(s), and passing the modified LTF symbols through a smoothing filter, for example, a low pass filter for removing the interference due to CFOs. Methods, apparatus, and systems described herein can be applied to 802.11ax or any other wireless standard.
    Type: Grant
    Filed: April 12, 2017
    Date of Patent: August 13, 2019
    Assignee: Intel Corporation
    Inventors: Qinghua Li, Xiaogang Chen, Yuan Zhu, Hujun Yin
  • Patent number: 10057087
    Abstract: Embodiments of the present invention provide a channel estimation method, a communications node, and a communications system. The method includes: obtaining a preamble in a signal packet sent by a first communications node, where the preamble includes at least a first field and a second field, a subcarrier of an orthogonal frequency division multiplexing OFDM symbol of the first field is used to carry a first reference signal, the first reference signal is a predetermined signal that is known to both a second communications node and the first communications node, a subcarrier of an OFDM symbol of the second field is used to carry useful information, and the useful information is physical layer control information and/or data; and obtaining, by using the first field and the second field, a first channel estimate, of each spatial flow, on all subcarriers of a multiple-input multiple-output transmission frequency band.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: August 21, 2018
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Sheng Liu
  • Patent number: 10007637
    Abstract: There is provided a single wire bus architecture comprising a single wire bus; a master device coupled to the single wire bus; at least one slave device coupled to the single wire bus; a communication protocol implemented over the single wire bus and employed by the master device and the at least one slave device; wherein when one of the at least one slave devices wishes to communicate with the master device, the one of the at least one slave devices discharges the clock signal during a tri-state stage of the clock signal; and wherein the single wire bus transmits a clock signal, power and data between the master device and the one of the at least one slave device in communication with the master device.
    Type: Grant
    Filed: June 23, 2014
    Date of Patent: June 26, 2018
    Assignee: BlackBerry Limited
    Inventor: Jens Kristian Poulsen
  • Patent number: 9807685
    Abstract: A method of transmitting basic service set (BSS) load information. The method according to one embodiment includes establishing, by an access point (AP), an association with at least one very high throughput (VHT) station that has successfully synchronized with the AP and that has a capability of receiving at least one spatial stream of a plurality of spatial streams transmitted via a multi user-multiple input multiple output (MU-MIMO) transmission; and broadcasting, by the AP, a beacon frame that includes load information including a station count field and an antenna utilization field. The station count field indicates a number of the at least one VHT station that has successfully synchronized with the AP and that has the capability of receiving at least one spatial stream of the plurality of spatial streams. The antenna utilization field indicates information about spatial streams that are under-utilized in the MU-MIMO transmission.
    Type: Grant
    Filed: April 2, 2015
    Date of Patent: October 31, 2017
    Assignee: LG ELECTRONICS INC.
    Inventor: Yong Ho Seok
  • Patent number: 9716574
    Abstract: A method of transmitting a training signal in a Wireless Local Area Network (WLAN) system includes generating one or more first training signals for a first destination station and one or more second training signals for a second destination station by applying a mapping matrix P to a training signal generation sequence, mapping the first training signals and the second training signals to a plurality of antennas according to an antenna mapping matrix, and performing Inverse Fast Fourier Transform (IFFT) on each of the first training signals and the second training signals mapped to the plurality of antennas and transmitting the training signals through the plurality of antennas.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: July 25, 2017
    Assignee: LG ELECTRONICS INC.
    Inventors: Byeong Woo Kang, Dong Wook Roh, Yong Ho Seok, Yu Jin Noh, Bong Hoe Kim, Dae Won Lee
  • Patent number: 9571212
    Abstract: Certain aspects of a method and system for wireless communication are disclosed. Aspects of one method may include a receiver that handles wireless communication. The receiver may be enabled to dynamically vary spacing between two or more pilots and/or the size of one or more pilots within at least one frame based on a determined symbol rate.
    Type: Grant
    Filed: July 18, 2013
    Date of Patent: February 14, 2017
    Assignee: BROADCOM CORPORATION
    Inventor: Tommy Yu
  • Patent number: 9559881
    Abstract: A transceiver system with reduced latency uncertainty is described. In one implementation, the transceiver system has a word aligner latency uncertainty of zero. In another implementation, the transceiver system has a receiver-to-transmitter transfer latency uncertainty of zero. In yet another implementation, the transceiver system has a word aligner latency uncertainty of zero and a receiver-to-transmitter transfer latency uncertainty of zero. In one specific implementation, the receiver-to-transmitter transfer latency uncertainty is eliminated by using the transmitter parallel clock as a feedback signal in the transmitter phase locked loop (PLL). In one implementation, this is achieved by optionally making the transmitter divider, which generates the transmitter parallel clock, part of the feedback path of the transmitter PLL.
    Type: Grant
    Filed: September 15, 2008
    Date of Patent: January 31, 2017
    Assignee: Altera Corporation
    Inventors: Neville Carvalho, Allan Thomas Davidson, Andy Turudic, Bruce B. Pedersen, David W. Mendel, Kalyan Kankipati, Michael Menghui Zheng, Sergey Shumarayev, Seungmyon Park, Tim Tri Hoang, Kumara Tharmalingam
  • Patent number: 9479378
    Abstract: Embodiments of the present invention provide a method for sending downlink data, a method for receiving downlink data, a base station, and a user terminal. The sending method includes modulating first downlink data into a first downlink signal by using a DFT-S-OFDM modulation mode; modulating second downlink data into a second downlink signal by using an OFDM modulation mode; and forming a downlink transmit signal from the first downlink signal and the second downlink signal in a multiplexing manner, and sending the downlink transmit signal to a user terminal. The base station includes a first generation module, a second generation module, and a first sending module. In the technical solutions of the present invention, downlink data is sent by using two modulation modes, DFT-S-OFDM and OFDM, thereby meeting requirements of different downlink data on EVM indexes.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: October 25, 2016
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Wei Bai, Yang Li, Xiaobo Chen
  • Patent number: 9401722
    Abstract: A phase-locked loop (PLL) includes a state machine programmed to automatically produce a set of control signals to select a charge-pump current and integrating capacitance value to automatically adjust a loop bandwidth of the PLL. A charge-pump DAC generates a charge-pump current of magnitude controlled by the state machine control signals. An integrator integrates the charge-pump output current to produce an integrated charge-pump output signal. The integrator has a plurality of capacitors switchably selected by control signals from the state machine to produce an integrating capacitance value. A voltage controlled oscillator (VCO) produces a PLL output frequency in response to the integrated charge-pump output signal.
    Type: Grant
    Filed: June 16, 2012
    Date of Patent: July 26, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Ajay kumar, Krishnaswamy Nagaraj, Joonsung Park
  • Patent number: 9392563
    Abstract: Techniques are disclosed for synchronizing frequency among a cluster of coordinated transmission points cooperating in a coherent joint transmission. In some embodiments, one transmission point is set (510) as a reference transmission point for a group of coordinated transmission points. Each of one or more other transmission points in the group receives (530) a specified downlink reference signal from the reference transmission point, measures (540) its frequency offset relative to the reference point, and compensates (550) the frequency offset in baseband processing or by a radio adjustment. Which transmission point acts as the reference transmission point is statically defined, in some embodiments, or dynamically configured, in others. Likewise, which time-frequency resources are used for the reference signal may be statically defined or dynamically configured.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: July 12, 2016
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Zhiheng Guo, Shaohua Li, Jinhua Liu, Zhan Zhang
  • Patent number: 9184969
    Abstract: Preamble for use within single user, multiple user, multiple access, and/or MIMO wireless communications. A selected preamble type is employed for use in generating a signal to be transmitted from one communication device to at least one other communication device. Depending upon a desired operational mode, as few as one preamble type, or two or more preamble types may be associated with a given operational mode. When operating in accordance with a given operational mode, a preamble type is selected from available preamble types of an operational mode. A preferred implementation may include two respective preamble types such that one preamble type is used for single user (SU) operation with transmit beamforming weights applied at the beginning of the packet or for open loop SU transmissions only, while the other preamble type, having an multiple user (MU) characteristic, is used for both SU beamforming and MU operations.
    Type: Grant
    Filed: April 23, 2012
    Date of Patent: November 10, 2015
    Assignee: Broadcom Corporation
    Inventors: Ron Porat, Vinko Erceg, Jun Zheng
  • Patent number: 9166708
    Abstract: An apparatus for detecting microwave signals is suggested. The apparatus comprises an antenna for sending and receiving electromagnetic waves a circuit for detecting microwave signals and the signalization stage for generating an indication signal. In addition to that a method for detecting the presence of microwave signals is proposed.
    Type: Grant
    Filed: September 17, 2013
    Date of Patent: October 20, 2015
    Inventors: Ali Louzir, Jean-Yves Le Naour, Jean-Luc Robert
  • Patent number: 9042463
    Abstract: A method and system for combining a guard interval and a corresponding portion of a received symbol, whereby when receiving a signal that contains the symbol with a guard interval corresponding to the symbol, a portion of the guard interval that is free from inter-symbol interference may be extracted, and the extracted portion of the guard interval may be combined with the corresponding portion of the symbol. The extracting and combining may be done after a determining, based on a delay profile provided by the received signal, that a delay spread is smaller than a predetermined channel delay. The delay spread may be determined by filtering an instantaneous delay spread associated with the received signal. The filtering may be performed using a 1-tap infinite impulse response low-pass filter. The low-pass filter may include a time constant that is the inverse of a maximum Doppler frequency shift.
    Type: Grant
    Filed: January 16, 2012
    Date of Patent: May 26, 2015
    Assignee: MAXLINEAR, INC.
    Inventors: Mingrui Zhu, Arun Kedambadi, Seung Chul Hong, Anand Anandakumar
  • Patent number: 9030339
    Abstract: A transmitting device includes a parallel data generation unit and a transmitting unit. The parallel data generation unit generates first serial data and second serial data from a data packet, converts the first serial data and second serial data respectively into first parallel data and second parallel data, transmits the first parallel data and second parallel data respectively through first and second parallel transmission paths, and performs the transmission of the first parallel data and the transmission of the second parallel data in parallel. The transmitting unit receives the first parallel data and second parallel data respectively through the first and second parallel transmission paths, re-converts the first parallel data and second parallel data respectively into the first serial data and second serial data, and transmits the first serial data and second serial data to a receiving device respectively through first and second serial transmission paths.
    Type: Grant
    Filed: July 2, 2014
    Date of Patent: May 12, 2015
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yusuke Fujita
  • Patent number: 9014305
    Abstract: One aspect of the present invention includes a bi-phase communication receiver system. The system includes an analog-to-digital converter (ADC) configured to sample a bi-phase modulation signal to generate digital samples of the bi-phase modulation signal. The system also includes a bi-phase signal decoder configured to decode the bi-phase modulation signal based on the digital samples. The system further includes a preamble detector comprising a digital filter configured to evaluate the digital samples to generate an output and to detect a preamble of the bi-phase modulation signal for decoding the bi-phase modulation signal based on the output.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: April 21, 2015
    Assignee: Texas Instruments Incorporated
    Inventor: Eric Gregory Oettinger
  • Patent number: 8989330
    Abstract: A technique includes receiving a datum indicative of a candidate delimiter in a receiver; and processing the datum in a machine to determine whether the datum indicates a synchronization delimiter. The processing includes comparing the candidate delimiter with a reference delimiter to identify at least one error in the candidate delimiter; and basing the determination of whether the datum indicates the synchronization delimiter at least on a bit position of of each error.
    Type: Grant
    Filed: July 30, 2010
    Date of Patent: March 24, 2015
    Assignee: Silicon Laboratories Inc.
    Inventors: Sharon D. Mutchnik, Moshe Gat
  • 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
  • Patent number: 8982974
    Abstract: Receiver synchronization techniques (RST), contributing more accurate synchronization of receiver clock to OFDM composite frame combined with much faster acquisition time and better stability of the receiver clock, and phase and frequency recovery techniques, comprising a software controlled clock synthesizer (SCCS) for high accuracy phase & frequency synthesis producing synchronized low jitter clock from external time referencing signals or time referencing messages wherein SCCS includes a hybrid PLL (HPLL) enabling 1-50,000 frequency multiplication with very low output jitter independent of reference clock quality.
    Type: Grant
    Filed: February 10, 2013
    Date of Patent: March 17, 2015
    Inventor: John W Bogdan
  • Patent number: 8948272
    Abstract: Methods and systems for augmenting a source message by suitably-chosen bits and/or sequences of bits for the purpose of enhancing decoding or synchronization performance. Properties of the source message can be used to select and optimize synchronization sequences, including their length and placement within the source message. Various message attributes, such as message or segment weight, symbol counts, and others, including their combinations, may be encoded into the synchronization sequence to further improve decoding performance in the presence of errors. These methods and systems can be employed for standalone source decoding of noisy bit streams, as well as iterative joint source-channel decoding. They may further be combined with other methods whether or not known in the art, such as CRC and forward error correction, to achieve the desired performance complexity trade-off.
    Type: Grant
    Filed: December 3, 2012
    Date of Patent: February 3, 2015
    Assignee: Digital PowerRadio, LLC
    Inventors: Branimir R Vojcic, Ivan V Bajic, Javad Haghighat
  • Patent number: 8867684
    Abstract: An apparatus for synchronizing an incoming signal with a clock signal comprises two or more synchronizer circuits, wherein each synchronizer circuit receives the incoming signal and the clock signal. Each synchronizer circuit generates a synchronized signal, wherein the state of each synchronized signal changes on a different phase of said clock signal in response to a change of the state of said incoming signal. A decision mechanism circuit receives the synchronized signals generated by each synchronizer circuit, wherein the decision mechanism circuit determines the output signal in response to the change of the state of the incoming signal. The decision mechanism circuit further comprises a memory element having a state which is set according to a previously detected state of said signal, wherein the output signal is determined according to the state of the memory element.
    Type: Grant
    Filed: September 5, 2013
    Date of Patent: October 21, 2014
    Assignee: Dialog Semiconductor GmbH
    Inventor: Nir Dahan
  • Patent number: 8854540
    Abstract: A signal transmission apparatus includes: a vertical rectangular region sampling-out control section that obtains vertical rectangular regions, repeatedly performs a process where pixel samples read out from each line of class images are mapped to each line of video data regions of sub-images, maps pixel samples to each line of the video data regions, and repeatedly maps pixel samples to the next line; a line sampling-out control section that samples out the pixel samples every other line from each line of the sub-images to which the pixel samples have been mapped, so as to generate an interlace signal; a word sampling-out control section that samples out for each word the pixel samples which have been sampled out for each line so as to be mapped to video data regions of an HD-SDI prescribed by the SMPTE 435-2; and a readout control section that outputs the HD-SDI.
    Type: Grant
    Filed: May 17, 2012
    Date of Patent: October 7, 2014
    Assignee: Sony Corporation
    Inventor: Shigeyuki Yamashita
  • Patent number: 8831542
    Abstract: A method, apparatus and computer program product are provided for conveying information regarding the antenna configuration and/or the transmission diversity scheme to a recipient, such as a mobile device. In particular, information regarding the antenna configuration and/or the transmission diversity scheme can be conveyed by masking, such as cyclic redundancy check masking, to provide information regarding the antenna configuration and/or the transmission diversity scheme. In this regard, a set of masks can be determined based upon hamming distances between the masks and bit diversities between the masks and where each of the masks within the set is associated with an antenna configuration and a transmission diversity scheme.
    Type: Grant
    Filed: January 7, 2009
    Date of Patent: September 9, 2014
    Assignee: Nokia Corporation
    Inventors: Timo Eric Roman, Bernhard Raaf, Mieszko Chmiel
  • Patent number: 8798208
    Abstract: Disclosed is an apparatus and method for detecting a code. The code detecting apparatus may include a detector to detect symbol synchronous timing information associated with a PSS code from a first signal received during a predetermined first period, a compensator to extract and buffer the PSS code and the SSS code based on the symbol synchronous timing information detected from a second signal received during a predetermined second period, and compensate for a frequency offset with respect to the buffered PSS code, and a processor to re-detect the symbol synchronous timing information based on the PSS code in which the frequency offset is compensated for, and extract the buffered SSS code using the re-detected symbol synchronous timing information.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: August 5, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Eun Jeong Shin, Dae Ho Kim
  • Patent number: 8737553
    Abstract: A method of frame sync detection is described. A first and second differential correlation of a data stream is calculated, at a plurality of delay and conjugate multipliers. The first and second differential correlations are convolved with a previous set of differential correlations. A correlation peak is calculated, at a sync detector, using the convolved differential correlations, to detect a frame sync.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: May 27, 2014
    Assignee: Thomson Licensing
    Inventors: Paul Gothard Knutson, Dirk Schmitt, Wen Gao
  • Patent number: 8718164
    Abstract: Techniques for transmitting pilot and for processing received pilot to obtain channel and interference estimates are described. A terminal may generate pilot symbols for a first cluster in a time frequency block based on a first sequence and may generate pilot symbols for a second cluster in the time frequency block based on a second sequence. The first and second sequences may include common elements arranged in different orders and may be considered as different versions of a single sequence. The terminal may transmit the pilot symbols in their respective clusters. A base station may obtain received pilot symbols from multiple clusters in the time frequency block. The base station may form each of multiple basis vectors with multiple versions of the sequence assigned to the terminal and may process the received pilot symbols with the multiple basis vectors to obtain a channel estimate for the terminal.
    Type: Grant
    Filed: April 29, 2013
    Date of Patent: May 6, 2014
    Assignee: QUALCOMM Incorporated
    Inventors: Petru Cristian Budianu, Dhananjay Ashok Gore, Alexei Yurievitch Gorokhov
  • 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: 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: 8705676
    Abstract: A multi-tone transceiver including: a transform component, a tone selector, an error detector, an aggregator and an oscillator. The transform component transforms received communications from the time domain to the frequency domain. The tone selector selects a sub-set of the received tones which exhibit an elevated signal-to-noise ratio (SNR) as a clock recovery tone set (CRTS) and drops and add tones to the CRTS as required by changes in the SNR of the individual tones. The error detector detects phase errors in each received tone of the CRTS. The aggregator calculates an average aggregate phase error from all tones in the CRTS. The oscillator controls clocking of the transceiver. The oscillator is responsive to the average aggregate phase error to adjust a clock phase in a direction which reduces a phase error with a clock on the opposing transceiver.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: April 22, 2014
    Assignee: Ikanos Communications Inc.
    Inventors: Robert Ayrapetian, Qasem Aldrubi, Hossein Dehghan-Fard, Christopher Chow
  • 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: 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
  • Patent number: 8687753
    Abstract: A method of syncing a serial data stream includes the step of providing a data stream having frames and sub-frames. Each sub-frame is provided with an expected SYNC Word, and there is an expected offset between the SYNC Words in each sub-frame. The data is sent to a plurality of sync modules. Each sync module searches for an expected and different one of the SYNC Words. The sync modules identify an expected SYNC Word, then look for a different one of the SYNC Words at said expected offset from its expected SYNC Word to verify that it has properly identified a SYNC Word.
    Type: Grant
    Filed: October 19, 2012
    Date of Patent: April 1, 2014
    Assignee: Hamilton Sundstrand Corporation
    Inventor: Paul J. Leblanc
  • Patent number: 8687645
    Abstract: A wireless communications device may include a portable housing and a temperature-compensated clock circuit carried by the portable housing. The device may further include a wireless receiver carried by the portable housing for receiving timing signals, when available, from a wireless network, and a satellite positioning clock circuit carried by the portable housing. A clock correction circuit may be carried by the portable housing for correcting the temperature-compensated clock circuit based upon timing signals from the wireless network when available, and storing historical correction values for corresponding temperatures. The clock correction circuit may also correct the temperature-compensated clock circuit based upon the stored historical correction values when timing signals are unavailable from the wireless network, and correct the satellite positioning clock based upon the temperature-compensated clock circuit.
    Type: Grant
    Filed: July 16, 2012
    Date of Patent: April 1, 2014
    Assignee: BlackBerry Limited
    Inventor: Michael Andrew Goldsmith
  • Patent number: 8669890
    Abstract: A method of estimating mismatches of a time-to-digital converter (TDC) includes: capturing phase error samples; calculating difference between the phase error samples and an expected value of the phase error samples; and adjusting correction gain of the TDC based on the calculating step. Another method of estimating mismatches of a TDC includes: capturing TDC output code samples; storing a plurality of accumulation values corresponding to different TDC values respectively, wherein each accumulation value records a number of times a TDC value is carried by the TDC output code samples; calculating a desired value based on the accumulation values; calculating difference between the accumulation values and the desired value; and adjusting correction gain of the TDC based on the calculating step.
    Type: Grant
    Filed: September 11, 2012
    Date of Patent: March 11, 2014
    Assignee: Mediatek Inc.
    Inventors: Chi-Hsueh Wang, Robert Bogdan Staszewski, Yi-Hsien Cho
  • Patent number: 8660111
    Abstract: A method and apparatus for enabling a radio to track channel timing and support channel scanning A non-leading radio operating on a communications channel, determines a diffusion period during which channel timing is to be propagated from a leading radio to non-leading radios operating on the communications channel. The non-leading radio implements a first scanning pattern during the diffusion period to scan a CT designated channel for a control timing message with a timing signal sent from the leading radio. The first scanning pattern involves scanning the CT designated channel during every other scan interval and scanning non-priority channels and priority channels during scan intervals not used on the CT designated channel.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: February 25, 2014
    Assignee: Motorola Solutions, Inc.
    Inventors: David G. Wiatrowski, John P. Belmonte, Dipendra M. Chowdhary, Yueh Ching Chung
  • Patent number: 8654915
    Abstract: A control signal receiver includes a converting circuit and a synchronization detection circuit. The converting circuit generates a complex control symbol stream including transmission configurations by converting an input signal. The synchronization detection circuit generates a first bit stream by applying a first determination criterion to the complex control symbol stream and generates a first synchronization signal by comparing the first bit stream with a reference synchronization word. The synchronization detection circuit generates a second bit stream by applying the first determination criterion and a second determination criterion to the complex control symbol stream in that order and generates a second synchronization signal by comparing the second bit stream with the reference synchronization word. The synchronization detection circuit outputs one of the first synchronization signal and the second synchronization signal as asynchronization enable signal.
    Type: Grant
    Filed: May 15, 2012
    Date of Patent: February 18, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jun-Young Jeong
  • Patent number: 8649416
    Abstract: A mobile electronic device that includes a circuitry configured to acquire synchronization with a spreading code of an intermediate frequency signal that is obtained by converting a frequency of a received signal from a satellite in a global positioning system into a predetermined intermediate frequency, demodulate a message included in the intermediate frequency signal, output a primary signal to a predetermined signal line, and attach a predetermined header to a secondary signal and output the result to the predetermined signal line, and includes a display unit configured to display data corresponding to the primary signal and the secondary signal, such that the primary signal includes results of measuring one of position, velocity, and time of the mobile electronic device based on the message that is demodulated by the circuitry, and that the secondary signal includes the intermediate frequency signal.
    Type: Grant
    Filed: March 13, 2013
    Date of Patent: February 11, 2014
    Assignee: Sony Corporation
    Inventors: Katsuyuki Tanaka, Manabu Nitta
  • Patent number: 8638895
    Abstract: In one embodiment, receiving an Ethernet signal over a channel, the Ethernet signal comprising a preamble frame, an idle frame, and a data frame, the preamble frame comprising one or more preamble codes; synchronizing to the Ethernet signal based on the preamble frame; replicating the one or more preamble codes; and training a decision feedback equalizer (DFE) based on the one or more replicated codes, the training enabling the DFE to use decision values at the DFE output to track channel variations.
    Type: Grant
    Filed: March 1, 2012
    Date of Patent: January 28, 2014
    Assignee: Broadcom Corporation
    Inventors: Ahmad Chini, Mehmet Tazebay, Scott Powell
  • Patent number: 8634506
    Abstract: Generate a series of digital data according to a pair of differential signals received from a low speed universal serial bus. Calibrate coarsely a frequency of an oscillator according to a width of an end-of-packet of the series of digital data. And calibrate finely the frequency of the oscillator according to a width of a SYNC pattern of the series of digital data.
    Type: Grant
    Filed: October 20, 2010
    Date of Patent: January 21, 2014
    Assignee: Weltrend Semiconductor Inc.
    Inventors: Fu-Yuan Hsiao, Ke-Ning Pan
  • Patent number: 8634478
    Abstract: An Linear Time Code (LTC) receiver for receiving and decoding a LTC frame of the type used in connection with film and television and accompanying audio includes a first counter that measures the number of reference clock periods within the duration of a bi-phase mark signal interval to yield a timing reference for extracting the payload from the LTC frame. A second counter detects a sync field within the LTC frame to establish the LTC frame direction. A third counter serves to count the number of symbols in the LTC frame. A state machine responsive to the counts of the first, second and third counters, serves to (a) detect a valid synchronization sequence within an incoming LTC frame; (b) determine the LTC frame direction, (c) decode (extract) payload information from the LTC frame; and (d) transfer the payload information in an order determined by the LTC frame direction.
    Type: Grant
    Filed: January 26, 2004
    Date of Patent: January 21, 2014
    Assignee: GVBB Holdings S.A.R.L.
    Inventor: John Joseph Ciardi
  • Patent number: 8594152
    Abstract: A communications network and method thereof include a base station controller configured to provide a repetition period of a primary synchronization channel to be equal to a predetermined integer value times a scrambling code length of the scrambling code of a common pilot channel. A user equipment in the network is configured to search for a known sequence comprising the primary synchronization channel to select a cell and a corresponding sub-frame/symbol timing from the selected cell.
    Type: Grant
    Filed: January 6, 2012
    Date of Patent: November 26, 2013
    Assignee: Amosmet Investments LLC
    Inventors: Ulo Parts, Anders Ostergaard Nielsen, Kaj Jansen
  • Patent number: 8588284
    Abstract: A medical sensor system comprises a gateway comprising a wideband receiver and a narrow band transmitter, the each gateway configured to receive a wideband positioning frame using the wideband receiver from one or more wearable sensors and to transmit acknowledgement frames using the narrow band transmitter that include timing and control data for use by the sensors to establish timing for transmission of the positioning frame; and at least one wearable sensor comprising a wideband transmitter and a narrow band receiver, the sensor configured to transmit a sensor data frame to the gateway using the wideband transmitter and to receive an acknowledgement frame from the gateway using the narrow band receiver, extract timing and control information from the frame, and adjust the timing and synchronization of the wideband transmitter using the timing and control information.
    Type: Grant
    Filed: June 1, 2011
    Date of Patent: November 19, 2013
    Assignee: Adeptence, LLC
    Inventors: Ismail Lakkis, Hock Law
  • Patent number: 8588345
    Abstract: Provided is an OFDM receiver which extracts a time sync signal from a prefix having a symmetric structure. The OFDM receiver, according to exemplary embodiments of the present invention, generates the sync signal (e.g., start point) of a symbol by using only the MSB (e.g., sign bit) of the cyclic prefix of an OFDM symbol, reducing the overhead of a logic circuit for generating the sync signal of the symbol.
    Type: Grant
    Filed: June 22, 2009
    Date of Patent: November 19, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Junyoung Jeong
  • Patent number: 8564411
    Abstract: Disclosed is an apparatus and methodology for synchronizing data received at a central location that has been collected at plural remote locations and separately transmitted to the central location. A plurality of remote sensors is provided and configured to be simultaneously triggered to begin a data collection sequence and to subsequently transmit the collected data along with remote sensor identification data and timing information to the central location. Timing information may include a specifically transmitted time reference or may be derived based on successive transmissions from the individual remote sensors.
    Type: Grant
    Filed: December 4, 2006
    Date of Patent: October 22, 2013
    Assignee: Michelin Recherche et Technique
    Inventor: David Alan Weston
  • Patent number: 8559579
    Abstract: An all-digital frequency synthesizer architecture is built around a digitally controlled oscillator (DCO) that is tuned in response to a digital tuning word (OTW). In exemplary embodiments: (1) a gain characteristic (KDCO) of the digitally controlled oscillator can be determined by observing a digital control word before and after a known change (?fmax) in the oscillating frequency; and (2) a portion (TUNE_TF) of the tuning word can be dithered (1202), and the resultant dithered portion (dkTF) can then be applied to a control input of switchable devices within the digitally controlled oscillator.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: October 15, 2013
    Assignee: Texas Instruments Incorporated
    Inventors: Robert B. Staszewski, Dirk Leipold, John Wallberg
  • Patent number: 8553812
    Abstract: Discussed herein is a synchronization structure for a receiving apparatus for receiving signals in a communication system, in which the signals are transmitted in frames, each frame comprising a synchronization part with synchronization sequences, wherein at least one of the synchronization sequences has a different phase than the other synchronization sequences. The synchronization structure includes a correlation unit configured to perform a correlation on the synchronization part, a peak detection unit configured to detect candidate correlation peaks and the correlation result, and a correlation peak detection unit configured to detect a correlation peak among said candidate correlation peaks on the basis of a confidence value and phase information. Further, a corresponding synchronization method that enables frame synchronization with a higher performance in low signal to noise ratio environments is also discussed.
    Type: Grant
    Filed: December 15, 2009
    Date of Patent: October 8, 2013
    Assignee: Sony Corporation
    Inventors: Qi Wang, Zhaocheng Wang
  • Patent number: 8526554
    Abstract: Apparatus and methods are disclosed, such as those involving deskewing serial data transmissions. One such apparatus includes a plurality of receivers, each of which is configured to receive a serial data stream. Each of the receivers includes a shift register including a plurality of stages arranged in sequence to propagate a stream of characters. Each of the stages is configured to store a character, and shift the character to a next stage in response to a clock signal. The receiver also includes a multiplexer having a plurality of inputs, each of the inputs being electrically coupled to a respective one of the stages of the shift register, and to select one of the stages to generate an output such that the outputs of the multiplexers in the receivers are deskewed.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: September 3, 2013
    Assignee: Analog Devices, Inc.
    Inventor: Michael Hennedy
  • Patent number: 8520787
    Abstract: Apparatus and methods are disclosed, such as those involving deskewing serial data transmissions. One such apparatus includes a plurality of receivers, each of which is configured to receive a serial data stream. Each of the receivers includes a shift register including a plurality of stages arranged in sequence to propagate a stream of characters. Each of the stages is configured to store a character, and shift the character to a next stage in response to a clock signal. The receiver also includes a multiplexer having a plurality of inputs, each of the inputs being electrically coupled to a respective one of the stages of the shift register, and to select one of the stages to generate an output such that the outputs of the multiplexers in the receivers are deskewed.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: August 27, 2013
    Assignee: Analog Devices, Inc.
    Inventor: Michael Hennedy
  • Patent number: 8509344
    Abstract: A radio transmission device and a radio communication method employ sequence length decision units which hold a correspondence in which one basic sequence length is set for a plurality of transmission bandwidths. The sequence length decision units acquire transmission bandwidth information and decide a sequence length corresponding to the acquired transmission bandwidth information. A decision is made as to which of the cyclic extension process or the truncation process is to be executed on a Zadoff-Chu sequence according to the sizes of the acquired transmission bandwidth information and the basic sequence length. Then, a difference between the transmission bandwidth and the basic sequence length, i.e., the number of possible cyclic extension/truncation symbols, is obtained.
    Type: Grant
    Filed: August 7, 2008
    Date of Patent: August 13, 2013
    Assignee: Panasonic Corporation
    Inventors: Yoshihiko Ogawa, Daichi Imamura, Takashi Iwai, Katsuhiko Hiramatsu, Tomofumi Takata, Atsushi Matsumoto
  • Patent number: 8503578
    Abstract: A method of processing first and second corresponding signals having a delay therebetween. The method includes introducing a plurality of different delays between the first and second signals, successive delay amounts differing from each other by less than the interval between chip boundaries, and for each introduced delay, summing samples of the second signal which are obtained at the times of, at least, chip boundaries between bits of the first signal which have the same state, to obtain a value; thereby to obtain a representation of how the value varies according to the introduced delay, which representation contains a level change associated with an introduced delay which bears a predetermined relationship to the delay between the first and second signals.
    Type: Grant
    Filed: March 27, 2008
    Date of Patent: August 6, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventor: Nongji Chen
  • Patent number: RE45557
    Abstract: A phase lock loop with multiple divider paths is presented herein. The phase lock loop can be used to provide a wide range of frequencies. The phase lock loop can also be used as a portion of a clock multiplier unit or a clock data and recovery unit.
    Type: Grant
    Filed: July 3, 2013
    Date of Patent: June 9, 2015
    Assignee: Broadcom Corporation
    Inventors: Mario Caresosa, Namik Kocaman, Afshin Momtaz