Synchronization Information Is Distributed Over Multiple Frames Patents (Class 370/510)
  • Patent number: 8385374
    Abstract: A multilane communication device and methods for using the multilane communication device. In one embodiment, a physical coding sub-layer module comprising includes multiple data transfer lanes in a port of a multi-lane Ethernet switch for transferring blocks of data between devices in the port. The physical coding sub-layer module further includes a synchronization marker generator for generating synchronization markers to be periodically transmitted over the multiple data transfer lanes. The physical coding sub-layer module further includes a data marker module configured to generate at least two data marker blocks from a respective portion of a synchronization marker and a respective portion of a block of data, and to provide the at least two data marker blocks to respective first and second ones of the multiple of data transfer lanes.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: February 26, 2013
    Assignee: Marvell Israel (M.I.S.L.) Ltd.
    Inventor: Aron Wohlgemuth
  • Publication number: 20130039369
    Abstract: In a data transmission system, a first node (100) receives at least two sets of input data signals (d-in1, d-in2) including at least two signals being based on different synchronization sources. The first node (100) extracts a respective clock signal (CLKex1, CLKex2) representing the embedded clock signals from said sources, samples and then formats these signals (CLKsp1, CLKsp2) for transmission according to a TDM structure. The TDM formatted signals are transmitted as at least one bit stream (bs1, bs2) over a transmission medium (L1, L2) to at least one second node (201, 202), where the bit stream (bs1, bs2) is demultiplexed into at least two sets of output data signals (d-out1, d-out2, d-out3, d-out4) respective demultiplexed clock signals (CLKdm1, CLKdm2) representing the sampled clock signals.
    Type: Application
    Filed: April 27, 2010
    Publication date: February 14, 2013
    Applicant: Transmode Systems AB
    Inventor: Gunnar Forsberg
  • Patent number: 8374452
    Abstract: The GCL sequence index of each cell/sector is assigned so that a difference of the indices between adjacent cells/sectors is more than N, where N?1. During GCL index detection, the adjacent N?1 indices of an index with the largest magnitude can be deleted from handoff candidate cell indices.
    Type: Grant
    Filed: April 7, 2011
    Date of Patent: February 12, 2013
    Assignee: Motorola Mobility LLC
    Inventors: Hidenori Akita, Masaya Fukuta, Hiroshi Hayashi
  • Patent number: 8374229
    Abstract: A method for the generation of a signal including a minimum of disturbances and noise is provided. A method for the detection of a signal including a minimum of disturbances and noise is also provided. An element of the signal is functionally dependent on at least one further element of the signal.
    Type: Grant
    Filed: February 26, 2008
    Date of Patent: February 12, 2013
    Assignee: Siemens Aktiengesellschaft
    Inventor: Jaroslaw Kussyk
  • Patent number: 8369386
    Abstract: A receiver includes a receiving unit that receives a signal from a satellite, a frequency conversion-discretization unit that converts the signal received in the receiving unit into an intermediate frequency signal of a frequency bandwidth including 0 Hz, and discretizes the frequency-converted intermediate frequency signal with a predetermined sampling frequency, a filter unit that filters the discretized signal, which is output from the frequency conversion-discretization unit, through a predetermined filter, a synchronization acquisition unit that acquires synchronization of a spreading code in the discretized signal filtered by the filter unit, and a synchronization holding unit that holds the synchronization of the spreading code, which is acquired by the synchronization acquisition unit.
    Type: Grant
    Filed: June 16, 2010
    Date of Patent: February 5, 2013
    Assignee: Sony Corporation
    Inventors: Hideki Takahashi, Katsuyuki Tanaka
  • Patent number: 8363681
    Abstract: According to various embodiments of the disclosure, systems, methods and apparatuses are provided for using ranging to improve network efficiency. In particular, various embodiments of the disclosure provide ranging to improve local clock time synchronization. According to one embodiment, a method for synchronizing a plurality of nodes on a communication network is provided, comprising: exchanging local clock times between a first node and a second node over the communication network; performing a ranging method between the first and second nodes based on the local clock times exchanged between the first and second nodes, wherein the ranging method results in an estimated propagation delay between the first and second nodes; and adjusting the local clock times of the first and second nodes based on the estimated propagation delay, thereby resulting in a synchronized local clock time at the first and second nodes.
    Type: Grant
    Filed: October 15, 2009
    Date of Patent: January 29, 2013
    Assignee: Entropic Communications, Inc.
    Inventor: Arndt Mueller
  • Patent number: 8363771
    Abstract: Provided are a transmission device, a receiving device, and a communication system having a simple configuration and capable of reliably executing the confirmation of a changed bit rate. The communication system 1 sends, to the receiving device 3, a serial data signal Sdata that is set as a constant value across a period of a constant multiple of a cycle of the clock when a bit rate of a serial data signal Sdata in the transmission device 2 is changed. The receiving device 3 that received the serial data signal Sdata receives training data Tdata from the transmission device 2 when it is determined that the serial data signal Sdata is a constant value across a period of a constant multiple of a cycle of the clock, and proceeds to the processing of confirming the changed bit rate.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: January 29, 2013
    Assignee: Thine Electronics, Inc.
    Inventors: Hironobu Akita, Seiichi Ozawa, Yohei Ishizone, Satoshi Miura
  • Patent number: 8358726
    Abstract: A source synchronous signal synchronization system includes a differential signal receiver; a tunable input delay element coupled to the receiver; an input serializer/deserializer (ISerDes) coupled to the tunable input delay; an alignment unit coupled to the ISerDes; and a delay control unit coupled to the tunable input delay, the ISerDes, and the alignment unit.
    Type: Grant
    Filed: June 11, 2010
    Date of Patent: January 22, 2013
    Assignee: NEC Laboratories America, Inc.
    Inventors: Junquiang Hu, Tyrone Kwok, Ting Wang
  • Patent number: 8340656
    Abstract: Various embodiments facilitate data communication between a client device and a remote device over a voice channel of a telephone system. In one embodiment, the data communication over the voice channel is synchronized to align with voice frames utilized by the telephone system to transmit communicated data between the devices. In some embodiments, the synchronization is performed by determining an offset between a received synchronization audio signal and the voice frames used by the telephone system to process the synchronization audio signal, such as based on an amount of energy present in the received synchronization audio signal.
    Type: Grant
    Filed: October 7, 2009
    Date of Patent: December 25, 2012
    Assignee: EchoStar Technologies L.L.C.
    Inventors: Gopi Manne, William Beals
  • Patent number: 8332059
    Abstract: For adding additional data, such as multi-channel extension data, to base data, such as conventional stereo data, a test fingerprint of test data relating to a test time instant of the test data is provided. The test data equals the additional data or the base data or depends on the additional data or the base data in parametric manner. Using the test fingerprint, reference time instant information is determined, which depends on a reference time instant in reference data, the reference data being the conventional stereo data. Finally, the additional data or the base data is manipulated, namely using the reference time instant information and the test time instant information, to obtain manipulated data, by which synchronous reproduction of the data information can be performed. Thus, a robust and flexible possibility for synchronous, especially late extension of base data by additional data is obtained.
    Type: Grant
    Filed: March 27, 2007
    Date of Patent: December 11, 2012
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Juergen Herre, Oliver Hellmuth, Andreas Hoelzer, Stefan Geyersberger
  • Patent number: 8331419
    Abstract: A method for generating a preamble of a data unit for transmission via a communication channel includes generating a first field of the preamble using one of a first sequence or a second sequence, such that the first sequence and the second sequence are complementary sequences such that a sum of out-of-phase aperiodic autocorrelation coefficients of the first sequence and the second sequence is zero; generating, using the other one of the first sequence or the second sequence, an indicator of a start of a second field of the preamble, the second field associated with channel estimation information, such that the indicator of the start of the second field immediately follows the first field; and generating the second field of the preamble.
    Type: Grant
    Filed: May 15, 2009
    Date of Patent: December 11, 2012
    Assignee: Marvell World Trade Ltd.
    Inventors: Hongyuan Zhang, Rohit U. Nabar, Songping Wu, Hui-Ling Lou, Quan Zhou
  • Patent number: 8331863
    Abstract: An embodiment for wirelessly communicating a signal includes a transmitter combining a plurality of phase shifted input data signals with a plurality of synchronization/pilot sequences to produce a plurality of combined signals, performing frequency domain-to-time domain transformations of the combined signals to produce a plurality of candidate signals, determining peak-to-average ratios for at least some of the plurality of candidate signals, identifying a selected signal from the plurality of candidate signals based on the peak-to-average ratios, and transmitting the selected signal over a wireless communication channel.
    Type: Grant
    Filed: January 26, 2012
    Date of Patent: December 11, 2012
    Assignee: General Dynamics C4 Systems, Inc.
    Inventors: John Eric Kleider, Robert John Baxley
  • Patent number: 8331347
    Abstract: A cell search method performed by a mobile station for communication in an OFDM system includes a first step of detecting a timing and a carrier frequency of a primary synchronization channel based on correlation detection between a primary synchronization channel sequence and a received signal; a second step of determining a timing and a carrier frequency of a secondary synchronization channel based on the timing and the carrier frequency of the primary synchronization channel and detecting cell-specific control information including a frame timing and a cell ID group; and a third step of performing correlation detection on each cell ID in the cell ID group with a common pilot symbol on a common pilot channel and identifying a cell ID from the cell ID group.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: December 11, 2012
    Assignee: NTT Docomo, Inc.
    Inventors: Yoshihisa Kishiyama, Kenichi Higuchi, Mamoru Sawahashi
  • Patent number: 8331420
    Abstract: Embodiments of methods and apparatus for wirelessly communicating signals include one or more transmitters configured to generate a plurality of wireless signal for transmission. Each of the wireless signals includes a plurality of pilot signals represented in a plurality of unevenly spaced, in-band subcarriers. Pilot signals of each wireless signal are positioned at subcarriers that are orthogonal in frequency with subcarriers at which pilot signals of all other wireless signals are positioned. According to an embodiment, subcarrier indices each the plurality of pilot signals are determined using a third order or higher order polynomial parameterization of pilot subcarriers in conjunction with a convex optimization algorithm to produce pilot signals having near-optimal channel estimate mean square error (MSE) performance. The wireless signals are simultaneously radiated over a wireless communication channel using a plurality of co-located or distributed antennas.
    Type: Grant
    Filed: December 30, 2009
    Date of Patent: December 11, 2012
    Assignee: General Dynamics C4 Systems, Inc.
    Inventors: John E. Kleider, Benjamin Russell Hamilton
  • Patent number: 8325784
    Abstract: A communication apparatus is connected to a transmission channel for transmitting data to another communication apparatus. The communication apparatus includes: a communication frame generator which generates a communication frame for storing the data; and a controller which controls to insert a pilot symbol into the communication frame based on a state of the transmission channel.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: December 4, 2012
    Assignee: Panasonic Corporation
    Inventors: Taisuke Konishi, Nobuhiko Noma, Nobutaka Kodama, Hisao Koga, Shigeo Yoshida
  • Patent number: 8320437
    Abstract: In a method and a device for decoding a signal, the signal is transmitted via at least one connecting line of a data transmission system, in a user of the data transmission system receiving the signal. It is provided to measure the interval of a change—provided compulsorily in a transmission protocol used in the data transmission system—of the signal from rising to falling or from falling to rising edge. A tendency for an asymmetrical delay of the signal can be ascertained from the measured interval. The sampling of the bits of the received signal can be improved as a function of the interval or of the asymmetrical delay, for example, by setting the sampling instant in variable fashion. Alternatively, the interval or the asymmetrical delay can be utilized for diagnostic purposes.
    Type: Grant
    Filed: April 13, 2006
    Date of Patent: November 27, 2012
    Assignee: Robert Bosch GmbH
    Inventors: Florian Hartwich, Andreas-Juergen Rohatschek, Eberhard Boehl
  • Patent number: 8320360
    Abstract: A method and apparatus for transmitting a primary and secondary synchronization channel is provided herein. During operation a transmitter will transmit a primary synchronization channel (P-SCH) in a subframe and a secondary synchronization channel (S-SCH) in the subframe. The S-SCH is modulated by a complex exponential wave and scrambled with a scrambling code. In certain embodiments of the present invention the P-SCH comprises a GCL sequence or a Zadoff-Chu sequence and the scrambling code is based on the GCL sequence index of the P-SCH.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: November 27, 2012
    Assignee: Motorola Mobility LLC
    Inventors: Masaya Fukuta, Hidenori Akita
  • Patent number: 8320410
    Abstract: Relay devices and sink devices that provide synchronized audio and/or video outputs are described. A relay device receives a first communication packet from a source device. The first communication packet includes a data frame. A timestamp is generated. The timestamp is an estimate of a time at which content defined by the data frame will be “played.” A second communication packet is generated that includes the data frame and the generated timestamp. The second communication packet is transmitted from the relay device. In one implementation, the generated timestamp is received by a plurality of sink devices, and is used to synchronize output signals (e.g., sound and/or video images) of the sink devices. In another implementation, the generated timestamp is received by a sink device, and is used to synchronize an output signal of the sink device with an output signal of the relay device.
    Type: Grant
    Filed: May 22, 2008
    Date of Patent: November 27, 2012
    Assignee: Broadcom Corporation
    Inventor: Mattias Per Agren
  • Patent number: 8320508
    Abstract: A system including an estimation module, a processing module, and a control module. The estimation module is configured to generate a first set of channel estimates for a plurality of subcarriers of a received signal. The processing module is configured to generate a second set of channel estimates for the plurality of subcarriers, in which the second set of channel estimates are generated based on the first set of channel estimates. The control module is configured to estimate a preamble sequence in the received signal based on each of (i) the first set of channel estimates and (ii) the second set of channel estimates.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: November 27, 2012
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Hui-Ling Lou
  • Patent number: 8311031
    Abstract: A method of and an apparatus therefor searching a cell in a mobile station of a communication system in which a plurality of cells are grouped into a plurality of cell groups, and each cell group includes at least two cells. The method includes detecting a primary synchronization signal and a secondary synchronization signal from a received signal, and identifying a cell based on a combination of the primary synchronization signal and the secondary synchronization signal. The secondary synchronization signal is related to the cell group to which the mobile station belongs and the primary synchronization signal is related to the cell to which the mobile station belongs within the cell group.
    Type: Grant
    Filed: February 28, 2011
    Date of Patent: November 13, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Il-Gyu Kim, Hyeong-Geun Park, Young-Jo Ko, Kapseok Chang, Hyoseok Yi, Young-Hoon Kim, Seung-Chan Bang
  • Patent number: 8307111
    Abstract: Applications executed out of router memory may acquire additional bandwidth that is not being used by other applications, in order to speed up network traffic. Scavenging may occur up to a point where current congestion is detected, at which point any scavenged bandwidth is relinquished and the application returns to its prescribed limit. After current congestion is mitigated, scavenging may occur up to a limit below the point where congestion was detected. After a predetermined interval, additional scavenging may occur beyond this limit until a preset bandwidth limit is reached.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: November 6, 2012
    Assignee: QLOGIC, Corporation
    Inventor: Charles Micalizzi, Jr.
  • Patent number: 8305872
    Abstract: In a method of enabling synchronization for a channel in an OFDM based telecommunication system initially providing a symbol for transmission and selecting at least two carrier frequencies, subsequently determining a respective weighting parameter for the selected frequencies and finally transmitting the symbol on all selected frequencies based on the weighting parameters.
    Type: Grant
    Filed: January 9, 2007
    Date of Patent: November 6, 2012
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Johan Nyström, Magnus Almgren, Lei Wan
  • Patent number: 8307265
    Abstract: Techniques are described that can be used to extend the data transmission rate specified by 10GBASE-KR of IEEE 802.3ap (2007) to more than 10 Gb/s using a multiple lane backplane. A signal for transmission over 10 Gb/s can be divided into multiple streams for transmission over multiple lanes. Multiple transceiver pairs can be used for transmission and receipt of the multiple streams. Each transceiver pair may comply with 10GBASE-KR of IEEE 802.3ap (2007).
    Type: Grant
    Filed: March 9, 2009
    Date of Patent: November 6, 2012
    Assignee: Intel Corporation
    Inventors: Ilango Ganga, Richard Mellitz
  • Publication number: 20120263195
    Abstract: A time synchronization method includes: after sending a synchronization message to the opposite end, sending a following message where an ending time for sending the synchronization message is recorded; receiving a delay request message sent by the opposite end, and sending a delay response message where the initial time for receiving the delay request message is recorded; receiving the synchronization message and the following message, and recording the initial time for receiving the synchronization message and the ending time recorded in the following message for sending the synchronization message; sending a delay request message, and recording an ending time for sending the delay request message; receiving a delay response message, and recording an initial time recorded in the delay response message for the opposite end to receive the delay request message; calculating the time offset value between the two ends, and completing time synchronization.
    Type: Application
    Filed: June 25, 2012
    Publication date: October 18, 2012
    Inventors: Bingbo LI, Long Jiang, Wenguang Xu, Wenhua Sun, Yuanxin Xu, Shumin Chen, Yang Wang, Chuangang Wang
  • Patent number: 8290094
    Abstract: Some embodiments disclosed herein relate to a method. In the method, a duration of a first synchronization pulse is measured. A fixed, predetermined number of ticks are equally spaced at a first time interval over the first sync pulse, regardless of the duration of the first synchronization pulse. A duration of a first data pulse is then measured by periodically incrementing a tick count value at the first time interval during the entire duration of the first data pulse. The tick count value at an end of the first data pulse is then correlated to a first digital value encoded on the first data pulse.
    Type: Grant
    Filed: January 18, 2010
    Date of Patent: October 16, 2012
    Assignee: Infineon Technologies AG
    Inventors: Andreas Kolof, Dietmar König
  • Patent number: 8284888
    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: January 14, 2010
    Date of Patent: October 9, 2012
    Inventor: Ian Kyles
  • Patent number: 8284872
    Abstract: A burst mode receiver including a CDR circuit that does not perform bit synchronization determination at a wrong position even when a burst signal waveform containing a distortion is input is provided. The burst mode receiver includes a CDR circuit for reproducing clock and data from a received signal, a bit synchronization determination circuit for determining whether the CDR circuit is in an optimum phase, a waveform distortion determination circuit for determining from the received signal whether there is waveform distortion, and a CDR output enable determination circuit for determining whether an output of the CDR circuit is valid or invalid. The CDR output enable determination circuit performs CDR output enable determination based on a bit synchronization determination result and a waveform distortion determination result.
    Type: Grant
    Filed: January 14, 2010
    Date of Patent: October 9, 2012
    Assignee: Hitachi, Ltd.
    Inventors: Jun Sugawa, Hiroki Ikeda, Masayoshi Yagyu
  • Patent number: 8279986
    Abstract: Provided are: plural circuit components including a circuit component which constitutes a receiving unit receiving a signal sequence which is arranged so that a desired signal and a signal different from the desired signal are lined up in time series, the desired signal indicating desired data which includes at least one of text data, sound data, image data, and a computer program product; and an operating parameter changing unit which changes an operating parameter of at least one of the plural circuit components, during a period in which the receiving unit receives the signal different from the desired signal.
    Type: Grant
    Filed: February 26, 2009
    Date of Patent: October 2, 2012
    Assignee: Sharp Kabushiki Kaisha
    Inventor: Nobuyoshi Kaiki
  • Patent number: 8279945
    Abstract: Methods for compensating timing errors in an A/V stream are provided. An embodiment of the methods includes: receiving a plurality of encoded video frames of a current Group of pictures (GOP) from the video encoder and a plurality of encoded audio frames; when an error occurs in the video encoder, utilizing a most recent encoded video frame of a previous GOP received from the video encoder as a reference to generate a plurality of dummy video frames; and utilizing the dummy video frames to pad the current GOP.
    Type: Grant
    Filed: January 28, 2008
    Date of Patent: October 2, 2012
    Assignee: Mediatek Inc.
    Inventors: Chi-Chun Lin, Shih-Rong Kao
  • Patent number: 8275002
    Abstract: A broadcasting service transmitting apparatus and method and a broadcasting service receiving apparatus and method for providing a broadcasting service formed of various types of data are provided. The broadcasting service receiving apparatus includes a receiving unit, a transport frame processing unit, a transport packet processing unit, and a broadcasting data processing unit. The receiving unit receives a transport frame having a predetermined size. The transport frame processing unit acquires from the transport frame service access information for accessing at least one broadcasting service and also acquires from the transport frame at least one transport packet for transporting at least one broadcasting data packet, by using the service access information. The transport packet processing unit processes the at least one transport packet so as to acquire at least one broadcasting data packet from the at least one transport packet.
    Type: Grant
    Filed: May 14, 2008
    Date of Patent: September 25, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-il Park, Ga-hyun Ryu
  • Patent number: 8275025
    Abstract: Methods and apparatus are provided for pseudo asynchronous testing of receive paths in serializer/deserializer (SerDes) devices. A SerDes device is tested by applying a source of serial data to a receive path of the SerDes device during a test mode. The receive path substantially aligns to incoming data using a bit clock. A phase is adjusted during the test mode of the bit clock relative to the source of serial data to evaluate the SerDes device. The source of serial data may be, for example, a reference clock used by a phase locked loop to generate the bit clock. The phase of the bit clock can be directly controlled during the test mode, for example, by a test phase control signal, such as a plurality of interpolation codes that are applied to an interpolator that alters a phase of the bit clock.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: September 25, 2012
    Assignee: LSI Corporation
    Inventors: Christopher J. Abel, Parag Parikh, Vladimir Sindalovsky
  • Patent number: 8270545
    Abstract: Certain embodiments of the present disclosure relate to a method for tracking of a carrier frequency offset. A soft combined frequency tracking discriminator is proposed as a part of the closed loop structure that can provide fast tracking of the frequency offset in an initial pull-in mode, and can also track small residual frequency variance in a fine-tracking mode.
    Type: Grant
    Filed: March 1, 2009
    Date of Patent: September 18, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Junqiang Li, Madihally J. Narasimha, Je Woo Kim
  • Patent number: 8259887
    Abstract: A method for detecting a specific timing from a synchronization channel is described. A signal with a known sequence is received. Two or more correlation values between the received signal and the known sequence are calculated at two or more positions. The two or more correlation values are compared. A determination is made whether the position of the known sequence has been shifted based on the comparison. A specific timing of a synchronization channel is detected based on the determination.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: September 4, 2012
    Assignee: Sharp Laboratories of America, Inc.
    Inventors: Kimihiko Imamura, Prem L. Sood
  • Patent number: 8254414
    Abstract: A communication system includes a plurality of communication stations arranged to respectively transmit a beacon on which beacon time information related to a beacon received from a peripheral communication station is placed at a predetermined transmission interval and control a beacon transmission timing of its own station while a collision with the beacon transmitted from the peripheral communication station is avoided on the basis of beacon information placed on the received beacon, in which at least a part of the communication stations includes means configured to decide a priority with respect to beacons received from at least one peripheral communication station and means configured to place beacon time information of a beacon having a high priority among the received beacons on a beacon of its own station, and transmits the beacon at a predetermined transmission interval.
    Type: Grant
    Filed: March 17, 2009
    Date of Patent: August 28, 2012
    Assignee: Sony Corporation
    Inventor: Kazuyuki Sakoda
  • Patent number: 8248911
    Abstract: Provided are a cell search method, a forward link frame transmission method, an apparatus using the methods, and a forward link frame structure in an Orthogonal Frequency Division Multiplexing cellular system, wherein the time it takes to perform a cell search and the complexity of the cell search can be reduced. The cell search apparatus includes a sync acquirer which receives a signal according to a forward link frame comprising a plurality of sync channel symbols each having different intervals between the adjacent sync channel symbols and achieves synchronization of the sync channel symbols using a sync channel of the received signal, and a boundary detector which detects a frame boundary using an interval pattern between the sync channel symbols, based on the achieved synchronization.
    Type: Grant
    Filed: November 10, 2006
    Date of Patent: August 21, 2012
    Assignees: Electronics and Telecommunications Research Institute, KT Corporation, SK Telecom. Co., Ltd.
    Inventors: Il-Gyu Kim, Hyeong-Geun Park, Nam-Il Kim, Kap-Seok Chang, Young-Hoon Kim, Seung-Chan Bang
  • Patent number: 8243777
    Abstract: A method and an apparatus for estimating a symbol timing offset in an Orthogonal Frequency Division Multiplexing (OFDM) based communication system are provided. A Carrier to Interference Ratio (CIR) of an Reference Signal (RS) is acquired using received pilot signals. The RS CIR includes power information on channel components of the RS. A CIR of a Secondary Synchronization Channel (S-SCH) is acquired using the received pilot signals. The S-SCH CIR includes power information on channel components of the S-SCH. Unnecessary channel components are suppressed from the RS CIR using the S-SCH CIR. Real channel components of the RS remain. An observation window is set having a predetermined duration for windowing the real channel components of the RS. A first arriving channel component is searched for within the observation window. A start point of data is estimated using the first arriving channel component.
    Type: Grant
    Filed: June 29, 2009
    Date of Patent: August 14, 2012
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Joo Yeol Yang, Hee Jin Roh
  • Patent number: 8238490
    Abstract: A method for determining a Doppler shift of a first signal is provided. First, a plurality of Doppler frequency hypotheses is combined to obtain a joint Doppler signal. The first signal is the correlated according to the joint Doppler signal and a plurality of code signals with phases corresponding to a series of code phase hypotheses to obtain a series of correlation results which are then examined to determine whether the Doppler shift does lie in the Doppler hypotheses. A fine Doppler search is then performed to determine the Doppler shift when the Doppler shift lies in the Doppler hypotheses.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: August 7, 2012
    Assignee: Mediatek Inc.
    Inventors: Hsin-Chung Yeh, Kuan-I Li
  • Patent number: 8233470
    Abstract: Embodiments of a multi-radio wireless communication device and methods for synchronizing wireless network and Bluetooth (BT) communications are generally described herein. Other embodiments may be described and claimed. In some embodiments, a BT radio module adjusts a master clock signal by a predetermined step size before each subsequent BT transmission in response to a frame sync pulse from a wireless network radio module to reduce a time difference between subsequent frame sync pulses and synchronization reference points of BT slots.
    Type: Grant
    Filed: June 28, 2007
    Date of Patent: July 31, 2012
    Assignee: Intel Corporation
    Inventors: Xue Yang, Eran Sudak, Xingang Guo
  • Patent number: 8229052
    Abstract: An apparatus and method for transmitting/receiving an S-SCH in an Institute of Electrical and Electronics Engineers (IEEE) 802.16m wireless communication system are provided. A method for transmitting, by a transmitter, a Secondary Synchronization CHannel (S-SCH) in a communication system includes generating a sequence depending on a cell IDentification (ID), determining a subcarrier set comprising subcarriers to map the generated sequence, based on a Fast Fourier Transform (FFT) size and a segment ID, and mapping the generated sequence to the subcarriers of the determined subcarrier set.
    Type: Grant
    Filed: January 7, 2010
    Date of Patent: July 24, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Sung-Eun Park, Jae-Weon Cho, Seung-Hoon Choi, Chi-Woo Lim, Song-Nam Hong
  • Patent number: 8228923
    Abstract: A network device having a system performance measurement unit employing one or more global time stamps for measuring the device performance is disclosed. The device includes an ingress circuit, a global time counter, an egress circuit, and a processor. The ingress circuit is configured to receive a packet from an input port while the global time counter generates an arrival time stamp in accordance with the arrival time of the packet. The egress circuit is capable of forwarding the packet to other network devices via an output port. The processor, in one embodiment, is configured to calculate packet latency in response to the arrival time stamp.
    Type: Grant
    Filed: January 9, 2008
    Date of Patent: July 24, 2012
    Assignee: Tellabs Operations, Inc.
    Inventors: Naveen K. Jain, Venkata Rangavajjhala
  • Patent number: 8229026
    Abstract: A transmission signal processing method is provided, for generating a first OFDM modulation signal and a second OFDM modulation signal which are transmitted in an identical frequency band, by utilizing a first antenna for transmitting the first OFDM modulation signal and by utilizing a second antenna for transmitting the second OFDM modulation signal. The method includes a step of generating the first OFDM modulation signal and the second OFDM modulation signal utilizing a plurality of OFDM modulation signal generators, and a step of outputting the first OFDM modulation signal to the first antenna and the second OFDM modulation signal to the second antenna.
    Type: Grant
    Filed: April 12, 2010
    Date of Patent: July 24, 2012
    Assignee: Panasonic Corporation
    Inventors: Yutaka Murakami, Masayuki Orihashi, Akihiko Matsuoka
  • Patent number: 8223648
    Abstract: A method and apparatus for synchronizing time in a Gigabit Passive Optical Network (GPON) in which an Optical Line Terminal (OLT) sends a downstream frame including a Physical Control Block downstream (PCBd) field and a payload field to an Optical Network Unit (ONU); the OLT determines a time value associated with a certain bit in the PCBd field of the downstream frame; and the OLT sends an Operation, Administration and Maintenance (OAM) message defined by a GPON protocol carrying the time value to the ONU, wherein the ONU uses the time value to adjust a local time of the ONU.
    Type: Grant
    Filed: October 7, 2011
    Date of Patent: July 17, 2012
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Ruobin Zheng
  • Patent number: 8219129
    Abstract: Wireless client devices within a wireless network exchange data with other wireless devices during particular time slots determined by the network. More particularly, the system generates and wirelessly broadcasts synchronization information to the client devices, where the synchronization information contains individual masks to be applied to bit fields of individual client devices, where said time slots are determined in accordance with the masked bit fields. In such a manner, client devices can be coordinated to communicate with the system in a dynamic real-time tiered manner.
    Type: Grant
    Filed: January 5, 2007
    Date of Patent: July 10, 2012
    Assignee: Proxense, LLC
    Inventors: David L. Brown, Fred S. Hirt
  • Patent number: 8208499
    Abstract: An approach is provided for supporting frame synchronization in a digital broadcast and interactive system. A transmitter includes an encoder that outputs a Low Density Parity Check (LDPC) codeword. The transmitter also includes a framing module generates a LDPC coded frame in response to the LDPC codeword, and appends a physical layer signaling field to the LDPC codeword for specifying modulation and coding information associated with the LDPC coded frame. The physical layer signaling field is encoded with a Forward Error Correction (FEC) code and has an embedded framing structure to assist with frame synchronization. The above arrangement is particularly suited to a digital satellite broadcast system.
    Type: Grant
    Filed: April 1, 2004
    Date of Patent: June 26, 2012
    Assignee: DTVG Licensing, Inc.
    Inventors: Feng-Wen Sun, Lin-Nan Lee
  • Patent number: 8199867
    Abstract: Described is an apparatus for suppressing spurious spectral lines in a frame based bit-serial data stream, in which frames include payload data and frame markers. The apparatus includes means (16) for randomizing first frame marker elements (START) in a first position within each frame and means (18) for correlating second frame marker elements (STOP) in a second position within each frame with the randomized first frame marker element.
    Type: Grant
    Filed: October 14, 2005
    Date of Patent: June 12, 2012
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Bengt Erik Jonsson, Per Lars Paul Ingelhag
  • Patent number: 8180007
    Abstract: An input bit stream including a clock signal and data bits is oversampled to obtain one or more sets of data samples. One or more sets of non-transitioning phases corresponding to data samples that do not switch between zero and one are then identified. Center phases corresponding to the one or more sets of non-transitioning phases are identified and then a final center phase that accurately represents the bits belonging to the input bit stream is selected. The data samples corresponding to the final center phase are extracted, thereby recovering the clock signal and data bits from the input bit stream.
    Type: Grant
    Filed: January 14, 2010
    Date of Patent: May 15, 2012
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Asif Iqbal, Girraj K. Agrawal, Ankit Pal
  • Patent number: 8175123
    Abstract: A method for positioning a collection window for a Fourier transform function is disclosed. A first orthogonal frequency division multiplexing (OFDM) symbol and a second OFDM symbol are received. The first OFDM symbol comprises a plurality of frequency division multiplexed (FDM) symbols. The first OFDM symbol is characterized by at least two of the following: a delay spread, a first arriving path (FAP), or a last arriving path (LAP). A channel location is estimated from a channel impulse response. A point relative to the channel location is selected. A beginning of the collection window is positioned for the second OFDM symbol at the selected point. Alternatively, a point is selected at a first location relative to the channel location using a first algorithm if a delay spread is less than a predetermined length. The selected point is chosen at a second location relative to the channel location using a second algorithm if the delay spread is greater than the predetermined length.
    Type: Grant
    Filed: March 8, 2006
    Date of Patent: May 8, 2012
    Assignee: QUALCOMM Incorporated
    Inventors: Bojan Vrcelj, Ashok Mantravadi, Fuyun Ling, Rajiv Vijayan, Michael Mao Wang
  • Patent number: 8175195
    Abstract: The invention relates to method and device for detecting propagation paths in pulse transmission, wherein a received signal comprises pulses on each time symbol. After synchronizing a pulse-based reception, the inventive method consists (A) in determining the arrival times of pulses of the same current time symbol, (B) in generating a path hypotheses by assigning an initial score to each dated pulse, (C) in determining the arrival times of pulses of the time symbol following the current symbol, (D) in relatively comparing the arrival times of pulses of the following time symbol with the arrival times of the path hypotheses and (E) in updating scores according to the relative comparison results. Said path detecting method is suitable for pulse information transmission, in particular in UWB.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: May 8, 2012
    Assignee: France Telecom
    Inventors: Jean Schwoerer, Benoît Miscopein
  • Patent number: 8170166
    Abstract: Apparatus, systems, and methods are provided for transmitting messages over a serial interface. A method comprises receiving a first signal at a first time and receiving a second signal at a second time, the second time being after the first time. If a difference between the second time and the first time is less than a threshold time period, the method comprises generating a first message that is representative of the first signal and the second signal and transmitting the first message over the serial interface. In accordance with one embodiment, the threshold time period is equal to one half of an interface acquisition delay time period associated with the serial interface.
    Type: Grant
    Filed: February 25, 2009
    Date of Patent: May 1, 2012
    Assignee: Freescale Semiconductor, Inc.
    Inventors: Kenneth E. Stebbings, Vivek Bhan, Daniel B. Schwartz
  • Patent number: 8165249
    Abstract: The present invention relates to an apparatus and method for estimating and compensating for a time offset and a carrier frequency offset in a Multiple Input Multiple Output (MIMO) communication system that supports Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiplexing Access (OFDMA). According to the present invention, a phase difference of pilot signals of the same transmitting antenna, which are received through receiving antennas, is calculated. An arc tangent operation is then carried out on the phase difference of the pilot signals to calculate a time offset linear phase and/or a carrier frequency offset linear phase. Further, a time offset compensation value and/or a carrier frequency offset compensation value are found by employing the time offset linear phase and/or the carrier frequency offset linear phase.
    Type: Grant
    Filed: August 30, 2007
    Date of Patent: April 24, 2012
    Assignee: Seah Networks Co., Ltd.
    Inventors: Zheng Zi Li, Byung-Chul Kim, Sang-Bae Ji