Synchronization Information Is Distributed Over Multiple Frames Patents (Class 370/510)
  • Patent number: 8165254
    Abstract: The present invention relates to an apparatus and a method for receiving signal for extent of timing synchronization in MB-OFDM UWB System. The invention divides the digital samples completed of sampling twice as much as minimum sampling clock required to restore the MB-OFDM received signal into ODD data path and EVEN data path, executes the packet detection and timing synchronization for each of divided path and selects the data of path with larger cross correlation value at the timing synchronization point to secure the stable receiving performance in system environment with severe frequency offset and prevent the FTT window shift within preamble section through adding minimum hardware and structural change without increasing the system clock.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: April 24, 2012
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Cheol Ho Shin, Byoung Hak Kim, Sang Sung Choi, Kwang Rho Park
  • Patent number: 8160169
    Abstract: A system including a magnitude measuring module, an energy normalization module, and a metric generation module. The magnitude measuring module is configured to measure magnitudes of real portions of differentially demodulated signals, wherein the differentially demodulated signals are generated by differential demodulation of signals received from a base station. The energy normalization module is configured to generate a sum of energies of a plurality of subcarriers included in the signals received from the base station. The metric generation module is configured to generate a plurality of metrics for a plurality of symbols included in the signals received from the base station. The metric generation module is further configured to detect, based on the plurality of metrics, a preamble symbol included in the signals received from the base station.
    Type: Grant
    Filed: August 22, 2011
    Date of Patent: April 17, 2012
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Qing Zhao
  • Patent number: 8140702
    Abstract: A method is provided for maximizing utility of a media delivery network having a media source, a first media adaptor, a second media adaptor and a media renderer. The media source can provide data in a first format and a second format. The first media adaptor can receive the data in the first format from the media source. The second media adaptor can receive the data in the second format from the media source. The first media adaptor can further provide data in a third format based on the received data in the first format. The second media adaptor can further provide data in a fourth format based on the received data in the second format. The media renderer can render the data in the third format and can render the data in the fourth format.
    Type: Grant
    Filed: December 28, 2009
    Date of Patent: March 20, 2012
    Assignee: General Instrument Corporation
    Inventors: Yong Wang, Rohit S. Bodas, Faisal Ishtiaq
  • Patent number: 8130876
    Abstract: The invention concerns a method for receiving a multi-carrier signal of reduced complexity when the number of carriers is not high. The method includes: demodulating the multi-carrier signal; converting a received signal received in binary representation into a modal representation in a base of at least two mutually prime numbers on a finite space of size equal to the product of the mutually prime numbers; demodulating including conversion.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: March 6, 2012
    Assignee: Thomson Licensing
    Inventors: Renaud Dore, Vincent Demoulin, Olivier Mocquard, Samuel Guillouard
  • Patent number: 8125976
    Abstract: The invention provides a method of generating a downlink signal and searching a cell on the basis of the downlink signal in an OFDM-based cellular system. The downlink signal includes a plurality of synchronization blocks each having a plurality of sub-frames, and a synchronization pattern composed of a combination of a cell group identification code for identifying a cell group and a frame synchronization identification code for indicating a frame start point is generated in each of the synchronization blocks. Different frame synchronization identification codes are allocated to the synchronization blocks.
    Type: Grant
    Filed: May 25, 2007
    Date of Patent: February 28, 2012
    Assignees: Electronics and Telecommunications Research Institute, SK Telecom., Co., Ltd., KT Corporation
    Inventors: Kap-Seok Chang, Il-Gyu Kim, Nam-Il Kim, Young-Hoon Kim, Seung-Chan Bang
  • Patent number: 8126103
    Abstract: A permuted sequences combination uses a frame structure in which two sync words, each comprising M complex symbols, are appended at the frame start. One benefit is the reduction of the large variance of the timing estimation error in the conventional correlation method. In at least one embodiment, the first sync word, {right arrow over (s)}1, is a predetermined constant amplitude zero autocorrelation (CAZAC) sequence. The second sync word, {right arrow over (s)}2, is a permutation of the first such that the combination of the two received sync signal vectors perform sliding window processing where the peak occurs at the correct frame start. The permuted sequences combination can be used in both AWGN channel and multi-path environments.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: February 28, 2012
    Assignee: New Jersey Institute of Technology
    Inventors: Miao Shi, Yeheskel Bar-Ness
  • Patent number: 8125934
    Abstract: A system and method for detecting a synchronization (sync) signal in a communication signal are disclosed. A received communication signal is stored in a memory and portions thereof are read from the memory and monitored to detect the sync signal. When a detected sync signal is determined to be invalid, previously read portions of the received communication signal, preferably beginning at a portion of the received signal immediately after a start of the detected sync signal, are again read and monitored to detect the sync signal. Such reading and monitoring of previously read portions of a received signal provide for recovery from so-called false triggering based on invalid sync signals.
    Type: Grant
    Filed: November 5, 2008
    Date of Patent: February 28, 2012
    Assignee: Research In Motion Limited
    Inventors: Sean B. Simmons, Zoltan Kemenczy
  • Patent number: 8121153
    Abstract: Devices and a system for synchronizing time between a centralized controller device and at least one subscriber device on a fiber access network. The control layer of a network device is expanded, and additional messaging control is added via the transmission of data frames. The expansion prevents reliance on a physical layer signal. The time synchronization also allows a time stamp to be incorporated into a message. Thus, bandwidth is not wasted by simply transmitting a time stamp by itself. In an embodiment, the centralized controller device measures the time difference between the time at which a particular ranging request is transmitted and the time at which the particular ranging request is received. The time difference represents the time adjustment value for the particular subscriber device and allows the device to synchronize its time with that of the centralized controller device.
    Type: Grant
    Filed: October 19, 2010
    Date of Patent: February 21, 2012
    Assignee: Broadcom Corporation
    Inventors: Dolors Sala, Ajay Chandra V. Gummalla
  • Patent number: 8116405
    Abstract: A method and apparatus for time synchronization (TS) method using GPS information in a communication system synchronizing the time of slave nodes, which do not have a GPS receiver, by using GPS information of a node having a GPS receiver. The method includes the steps of extracting 1PPS, TOD, 1PPS_en, and clocks using GPS signals by a grand master node having a GPS receiver, stabilizing the signals, generating a sync message for TS, and transmitting the sync message to a slave node; receiving the sync message by the slave node and conducting a TS operation using OFCC synchronization technology extracting 1PPS, TOD, and 1PPS_en signals using the modified TOD information by the block and delivering to a stabilization block of the slave node for stabilization; and redelivering to the TS block to update TOD information and generate a sync message for TS of a second slave node.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: February 14, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Jae-Hun Cho, Byung-Duck Cho, Yun-Je Oh, Seong-Taek Hwang
  • Patent number: 8107499
    Abstract: A method includes defining a pattern of time intervals, each time interval having a respective assigned communication speed, which alternates among multiple communication speeds supported by a first communication device. Synchronization requests are transmitted over a communication medium from the first communication device to a second communication device at the respective communication speed that is assigned in each interval in accordance with the pattern. While transmitting the synchronization requests, synchronization replies sent over the communication medium in response to the synchronization requests are received only at the respective communication speed that is assigned in each interval. Responsively to receiving the synchronization replies from the second communication device, one or more common communication speeds that are supported by both the first and the second communication devices are identified.
    Type: Grant
    Filed: June 21, 2007
    Date of Patent: January 31, 2012
    Assignee: Cisco Technology, Inc.
    Inventors: Wei-Jen Huang, Chih-Tsung Huang, Claudio DeSanti
  • Patent number: 8107548
    Abstract: A digital broadcast transmitting/receiving system and a signal processing method thereof that can improve the receiving performance of the system. A digital broadcast transmitter has a randomizer to randomize an input data stream which has null bytes being inserted at a specified position, a multiplexer to output a data stream formed by inserting specified known data into the position of the null bytes of the randomized data stream, an encoder to encode the data stream outputted from the multiplexer, and a modulator/RF-converter to modulate the encoded data, RF-convert the modulated data and transmit the RF-converted data. The receiving performance of the digital broadcast transmitting/receiving system can be improved even in a multi-path channel by detecting the known data from the received signal and using the known data in synchronization and equalization in a digital broadcast receiver.
    Type: Grant
    Filed: October 1, 2009
    Date of Patent: January 31, 2012
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Hae-joo Jeong, Yong-deok Chang
  • Patent number: 8098713
    Abstract: An embodiment for wirelessly communicating a signal includes a transmitter generating and transmitting a wireless signal over a wireless communication channel. The wireless signal includes a guard band, data represented within a plurality of data-bearing subcarriers, and a plurality of pilot signals represented within a plurality of pilot subcarriers. In an embodiment, the plurality of pilot signals have variable pilot signal parameters selected from a group of parameters that includes pilot power and pilot spacing with respect to adjacent pilots. An embodiment further includes a receiver receiving a channel-affected version of the wireless signal, and producing a corrected signal by applying corrections to the received signal based on estimated channel perturbations within the received signal, where the estimated channel perturbations are determined based on the plurality of pilot signals. The receiver also produces an output data symbol from the corrected signal.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: January 17, 2012
    Assignee: General Dynamics C4 Systems
    Inventors: Robert John Baxley, John Eric Kleider, Kelly Anderson
  • Patent number: 8098693
    Abstract: The present invention provides a method of early starting the operation of a descrambler. The method comprises the steps of receiving a, synchronous byte of a transport packet in a group of m packets, where m is an integer, generating an alignment index to indicate a location of the synchronous byte, delivering the alignment index to the descrambler, and loading an initialization sequence to the descrambler in accordance with the alignment index and starting an operation of the descrambler.
    Type: Grant
    Filed: May 3, 2006
    Date of Patent: January 17, 2012
    Assignee: Himax Technologies Limited
    Inventors: Tien-Hsin Chang, Shin-Shiuan Cheng
  • Patent number: 8095161
    Abstract: A method for determining a transmission timing is provided. The method includes steps of, at a first point in time, determining a first transmission timing for transmissions from a user entity to a first radio transceiver, and determining a representation of a first position of the user entity in relation to the first radio transceiver and at least a second and a third radio transceiver. The method further includes, at a second point in time, subsequent to the first point in time, determining a representation of a second position of the user entity in relation to the first, second and third radio transceivers, and adjusting the transmission timing based on a difference of the first position and the second position.
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: January 10, 2012
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: David Sandberg
  • Patent number: 8090066
    Abstract: A method and a circuit for obtaining asynchronous demapping clock. The method includes: obtaining a smoothed clock with even gaps in accordance with data to be demapped and a corresponding clock signal; performing phase locking in accordance with a signal reflecting writing and reading conditions of data of a First In First Out (FIFO), to obtain a clock signal required for demapping. The method can effectively filter off jittering created during asynchronous mapping/demapping processes and may ensure a high-performance clock output. Furthermore, the method is applicable to not only mapping from OTN to SDH but also other asynchronous demapping processes, e.g., mapping from SDH to OTN, and thereby effectively improving the performance of data demapping.
    Type: Grant
    Filed: February 6, 2007
    Date of Patent: January 3, 2012
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Kuiwen Ji, Lei Shi
  • Patent number: 8081865
    Abstract: To provide an AV data recording and reproducing apparatus capable of easily carrying out real-time recording and reproducing via a 1394 interface, and method thereof. Input time information relating to one or a plurality of transport packets are stored in the different transport packet; the transport packets and the different transport packet having input time information relating to the transport packets are recorded; and at the same time the transport packet recorded in the recording medium and the different transport packet are read; the different transport packet corresponding to one of a plurality of the recorded transport packets are extracted and the input time is specified; and based on the input time information, the corresponding transport packet is output.
    Type: Grant
    Filed: March 27, 2002
    Date of Patent: December 20, 2011
    Assignee: Panasonic Corporation
    Inventor: Masanori Ito
  • Patent number: 8068467
    Abstract: A method for transmitting beacons by nodes in a multi-tier wireless local area network is disclosed. First, a first beacon by a tier 1 node in the multi-tier wireless local area network is transmitted. Then, a second beacon by a tier 2 node is transmitted where the second beacon is transmitted based upon the time that the first beacon is sent by the tier 1 node.
    Type: Grant
    Filed: October 22, 2004
    Date of Patent: November 29, 2011
    Assignee: Motorola Soulutions, Inc.
    Inventors: Aparna Pandey, Randy L. Ekl, Christopher G. Ware
  • Patent number: 8064558
    Abstract: A receiving apparatus includes a first receiver, a second receiver, a received signal synthesizer connected to the first and second receivers, a synchronizing signal synthesizer connected to the first and second receivers, and a synchronization detector connected to the synchronizing signal synthesizer. In this structure, synchronization determination is performed using a synchronizing signal of either the first or second receiver, and diversity reception is performed using the received signals of the first and second receivers.
    Type: Grant
    Filed: August 28, 2007
    Date of Patent: November 22, 2011
    Assignee: Panasonic Corporation
    Inventors: Yasunobu Tsukio, Hiroaki Ozeki
  • Patent number: 8054861
    Abstract: A method of processing data comprises the receiving a frame of data having a predetermined number of time slots (502,504,506). Each time slot comprises a respective plurality of data symbols (520). The method further comprises a primary (508), a secondary (510) and a tertiary (512) synchronization code in each said predetermined number of time slots.
    Type: Grant
    Filed: November 22, 2010
    Date of Patent: November 8, 2011
    Assignee: Texas Instruments Incorporated
    Inventor: Sundararajan Sriram
  • Patent number: 8050881
    Abstract: A system for synchronizing data after they are collected and stored locally in sensor units in a distributed sensor system, so that wired or wireless communication is not required during a data-collection session. Each sensor unit has a local clock providing local-clock times before and after a data-collection session, and a data processor uses its local clock or a sensor unit's local clock as the reference to compute each sensor unit's time-scaling factor, which is the ratio of the elapsed reference local-clock time and the elapsed local-clock time. The data processor uses the time-scaling factor to convert each sensor unit's local-clock data-sampling times to the reference local-clock data-sampling times, and the data processor subsequently interpolates sensor data to approximate simultaneous sensor-data values at desired reference local-clock times. A physical-activity monitoring system can use this synchronization method to reduce the size, power consumption, and cost of the sensor units.
    Type: Grant
    Filed: October 1, 2008
    Date of Patent: November 1, 2011
    Assignee: Enbiomedic
    Inventors: King-Wah Walter Yeung, Wei-Wei Vivian Yeung
  • Patent number: 8050250
    Abstract: The present invention discloses a random access method for user equipment (UE) in time division synchronization code division multiple access (TD-SCDMA) communication system, including the following steps: (a) the system broadcasts the configured ASC and the configuration information thereof to the UE, the UE records these information; (b) the MAC of the UE sends RACH transmission request to the physical layer, the physical layer selects one RACH; (c) the physical layer of the UE randomly selects an uplink synchronization code and an uplink synchronization sub-channel; (d) after the physical layer of the UE transmits the selected uplink synchronization code in the uplink pilot time slot corresponding to the selected uplink synchronization sub-channel, if the UE receives the access confirmation message from the network, the UE completes the uplink synchronization and selects PRACH to send out the message, otherwise, the access to the network is re-performed.
    Type: Grant
    Filed: January 18, 2006
    Date of Patent: November 1, 2011
    Assignee: ZTE Corporation
    Inventors: Yincheng Zhang, Xuejun Yang, Zijiang Ma, Zhifeng Ma
  • Patent number: 8040922
    Abstract: The present invention relates to an apparatus and method of frame synchronization in broad band wireless communication systems. In an apparatus of frame synchronization in a mobile station, a time variant phase rotation compensator eliminates time variant phase rotation carried in received signals by conjugated multiplication between adjacent signal samples. Then, the processed signal is fed into a delay correlator to calculate a plurality of correlations between two successive frames. A local power calculator acquires an average power of several symbols centered on delayed correlation values. A normalizer normalizes the delayed correlation values with a local average power corresponding to the delayed correlation values. A maximum value detector selects the maximum value from normalized correlation values to trigger frame synchronizing and timing signals.
    Type: Grant
    Filed: March 7, 2008
    Date of Patent: October 18, 2011
    Assignee: Fujitsu Limited
    Inventors: Xin Wang, Yuuta Nakaya, Syuusaku Suzuki, Michiharu Nakamura, JianMin Zhou, Hiroyuki Hayashi
  • Patent number: 8027372
    Abstract: Each base station transmits a TDM pilot 1 having multiple instances of a pilot-1 sequence generated with a PN1 sequence and a TDM pilot 2 having at least one instance of a pilot-2 sequence generated with a PN2 sequence. Each base station is assigned a specific PN2 sequence that uniquely identifies that base station. A terminal uses TDM pilot 1 to detect for the presence of a signal and uses TDM pilot 2 to identify base stations and obtain accurate timing. For signal detection, the terminal performs delayed correlation on received samples and determines whether a signal is present. If a signal is detected, the terminal performs direct correlation on the received samples with PN1 sequences for K1 different time offsets and identifies K2 strongest TDM pilot 1 instances. For time synchronization, the terminal performs direct correlation on the received samples with PN2 sequences to detect for TDM pilot 2.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: September 27, 2011
    Assignee: QUALCOMM Incorporated
    Inventors: Aamod Khandekar, Avneesh Agrawal
  • Patent number: 8009724
    Abstract: Clear channel assessment (CCA) is a very important issue in Ultra-Wideband (UWB) systems. An effective CCA mechanism will have a large impact on the overall throughput of the communications system. It is disclosed methods and circuits to carry out CCA determinations exploiting the structure of the pulse signal either by using a moving average or by performing a cross-correlation with a locally generated signal.
    Type: Grant
    Filed: August 25, 2005
    Date of Patent: August 30, 2011
    Assignee: NXP B.V.
    Inventors: Charles Razzell, Yifeng Zhang
  • Patent number: 8005155
    Abstract: A system includes an input, a differential demodulation module, a magnitude measuring module, a summing module, and a metric generator module. The input receives input signals that include s sets of modulated sub-carriers carrying symbols, where s is an integer greater than or equal to 1. The differential demodulation module generates differentially demodulated signals based on the input signals. The magnitude measuring module measures magnitudes of real portions of the differentially demodulated signals. The summing module generates s sums, wherein each of the s sums is a sum of the magnitudes generated based on a respective one of the s sets. The metric generator module generates metrics for the symbols based on the s sums.
    Type: Grant
    Filed: December 18, 2007
    Date of Patent: August 23, 2011
    Assignee: Marvell International Ltd.
    Inventors: Jungwon Lee, Qing Zhao
  • Patent number: 7995694
    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: July 25, 2007
    Date of Patent: August 9, 2011
    Assignee: Sharp Laboratories of America, Inc.
    Inventors: Kimihiko Imamura, Prem L. Sood
  • Patent number: 7991017
    Abstract: The invention relates to a communication system and a method for controlling a communication system for communicating audio data between each of a plurality of terminal units (T1-T3). In order to provide a deterministic communication protocol with lowest possible overhead and a system for implementing same said method is characterized by the steps of: examining an identity of said terminal units (T1-T3) by said central unit (10) during an initialization phase; transmitting a predetermined data frame including a first synchronization signal, a terminal unit address of a respective terminal unit, a payload field and a second synchronization signal by said central unit (10) via said master bus (14) during a configuration phase; and transmitting audio data through said data bus (12) by one of said plurality of terminal units (T1-T3) within an audio sample time interval that corresponds to the interval between said first synchronization signal and said second synchronization signal.
    Type: Grant
    Filed: July 4, 2007
    Date of Patent: August 2, 2011
    Assignee: Airbus Operations GmbH
    Inventors: Burkhard Heinke, Christian Wiese, Marcus Smidt
  • Patent number: 7969964
    Abstract: In a cellular system in which OFDM is used, a forward link synchronization channel, a common pilot channel structure, an initial cell searching method of a mobile station, and an adjacent cell searching method for handover are required. A method of transmitting a forward synchronization signal in a wireless communication system according to the present invention includes generating a frame comprised of a plurality of sync blocks; and transmitting the frame through a forward link, wherein the frame comprises primary synchronization channel sequences which provide timing information of the sync blocks and a plurality of secondary synchronization channel sequences which provide timing information of the frame, wherein a cell identifier is specified by a combination of the primary synchronization channel sequence and a hopping code word specified by the plurality of the secondary synchronization channel sequences. Therefore, the cell searching time can be efficiently reduced in an OFDM system.
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: June 28, 2011
    Assignee: Electronics & 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: 7953142
    Abstract: A variable code-tracking loop filter in a receiver having the ability to change its parameters multiple times in response to received signals. Parameters for the code-tracking loop filter may be varied based on phase and frequency errors from an error detector. In one implementation, the code-tracking loop filter is able to repeatedly vary a single parameter, such as its received bandwidth, based on the phase and frequency errors, while in another, the code-tracking loop filter may vary two or more parameters, such as the loop bandwidth and the natural frequency.
    Type: Grant
    Filed: October 17, 2002
    Date of Patent: May 31, 2011
    Assignee: Sirf Technology
    Inventor: Mangesh Chansarkar
  • Patent number: 7949299
    Abstract: A system and method for configuring the system for configuring a wireless multi-cell communication to provide multimedia broadcast services (MBMS) to a plurality of wireless transmit/receive units (WTRUs). The cells of the communication system are organized into a plurality of sets of one or more cells. Resource units are assigned to each set of cells in the communication system. The assigned resource units are allocated in each cell of the communication system for MBMS transmission. The WTRUs receive information indicating how to access the resource units allocated for MBMS transmission. The WTRUs receive the MBMS from one or more of the cells of the communication system.
    Type: Grant
    Filed: July 14, 2009
    Date of Patent: May 24, 2011
    Assignee: InterDigital Technology Corporation
    Inventors: Marian Rudolf, Stephen G. Dick
  • Patent number: 7916759
    Abstract: A method of generating a code sequence and method of adding additional information using the same are disclosed, by which a code sequence usable for a channel for synchronization is generated and by which a synchronization channel is established using the generated sequence. The present invention, in which the additional information is added to a cell common sequence for time synchronization and frequency synchronization, includes the steps of generating the sequence repeated in time domain as many as a specific count, masking the sequence using a code corresponding to the additional information to be added, and transmitting a signal including the masked sequence to a receiving end.
    Type: Grant
    Filed: December 20, 2006
    Date of Patent: March 29, 2011
    Assignee: LG Electronics Inc.
    Inventors: Seung Hee Han, Min Seok Noh, Yeong Hyeon Kwon, Young Woo Yun, Hyun Hwa Park, Hyun Woo Lee, Dong Cheol Kim
  • Patent number: 7912033
    Abstract: A method to enable scheduling communications activities for an electronic communication device configured to communicate across a communication network is provided. The method comprises the steps of scheduling a communication activity during a scheduling window such that the communication activity is scheduled to occur toward the end of a communication window; entering a power-save mode after the scheduling step; and transitioning from the power-save mode prior to the scheduled communication activity. In one embodiment the method can further include a step of conducting the scheduled communication activity and transitioning back to the power-save mode after a next communication activity is scheduled or be implemented to allow the step of conducting the scheduled communication activity and transitioning back to the power-save mode at the end of the next communication window.
    Type: Grant
    Filed: January 4, 2006
    Date of Patent: March 22, 2011
    Assignee: Olympus Corporation
    Inventors: Ghobad Heidari-Bateni, Stanislaw Czaja
  • Patent number: 7885671
    Abstract: A system and method for state synchronization between a base station and a mobile station in a mobile communication system. A count value indicative of a state change of the base station is received. The received current count value is compared with a previous count value previously received and stored. If the current count value is different from the previous count value, the mobile station performs a network entry procedure with the base station.
    Type: Grant
    Filed: July 6, 2006
    Date of Patent: February 8, 2011
    Assignee: Samsung Electronics Co., Ltd
    Inventors: Yeong-Moon Son, Hong-Sung Chang, Pan-Yuh Joo, Jung-Je Son, Jae-Weon Cho, Mi-Hyun Lee, Hyun-Jeong Kang, Song-Nam Hong, Sung-Jin Lee, Hyoung-Kyu Lim, Young-Ho Kim
  • Patent number: 7885250
    Abstract: A method and apparatus for synchronizing timing of Access Points (APs) and/or Synchronization Units (SUs) includes (a) arranging a cable having at least four pairs of twisted wires connected between two or more fixed APs and/or SUs in a network; (b) assigning a first pair of the twisted wires to carry a positive D.C. voltage to at least one AP or SU; (C) assigning a second pair of the twisted wires to carry a negative D.C. voltage to at least one AP or SU; (d) providing to the first and second pairs of rails a series of synchronization pulses generated from a synchronization source and capacitively-coupled to the first and second pairs of twisted wires so as to supply a composite signal; and (e) reconstructing the generated synchronization pulses by detecting pulses on the positive and negative D.C. voltages at a receiving end by at least one AP or SU.
    Type: Grant
    Filed: February 3, 2005
    Date of Patent: February 8, 2011
    Assignee: Koninklijke Philips Electronics N.V.
    Inventor: Tim Whittaker
  • Patent number: 7860132
    Abstract: A method of processing data comprises the receiving a frame of data having a predetermined number of time slots (502,504,506). Each time slot comprises a respective plurality of data symbols (520). The method further comprises a primary (508), a secondary (510) and a tertiary (512) synchronization code in each said predetermined number of time slots.
    Type: Grant
    Filed: October 27, 2009
    Date of Patent: December 28, 2010
    Assignee: Texas Instruments Incorporated
    Inventor: Sundararajan Sriram
  • Patent number: 7855994
    Abstract: In a mobile communication system, multiple transceivers perform radio communications in the same frequency band.
    Type: Grant
    Filed: April 26, 2006
    Date of Patent: December 21, 2010
    Assignee: NTT DoCoMo, Inc.
    Inventors: Hiromasa Fujii, Takatoshi Sugiyama, Hitoshi Yoshino
  • Patent number: 7839839
    Abstract: A system and method are provided for deinterleaving differential inverse multiplexed (DIM) virtual channels in a 40G Ethernet receiver. The method accepts a 10.3125 gigabits per second (Gbps) (10G) Ethernet virtual channel with 64B/86B blocks, including periodic Lane Alignment Marker (LAM) blocks. The 10G virtual channel is deinterleaved into two 5.15625 Gbps (5G) virtual channels by: 1) deinterleaving consecutive blocks from the 10G virtual channel into the 5G virtual channels in an alternating order, and 2) reversing the order of deinterleaving in response to each detected LAM block. Then, the method supplies the 5G virtual channels (i.e. to a MAC module).
    Type: Grant
    Filed: October 13, 2008
    Date of Patent: November 23, 2010
    Assignee: Applied Micro Circuits Corporation
    Inventors: Matthew Brown, Dimitrios Giannakopoulos, Jim Lew, Michael John Hellmer
  • Patent number: 7839895
    Abstract: Methods and systems provide approaches to start code emulation prevention at a granularity higher than the bit level. By operating at a level other than the bit level, processing capability requirements on both the encoder and decoder side can be reduced. In accordance with one or more embodiments, a start code emulation prevention method looks for data patterns relative to fixed-size data portions larger than single bits. When a particular pattern is found, start code emulation prevention data is inserted to prevent start code emulation. The inserted data is larger than a single bit and, in some embodiments, comprises a byte. When a decoder decodes data that has had start code emulation prevention data inserted, it can easily identify legitimate start codes and then can remove the start code emulation prevention data to provide the original data that was protected.
    Type: Grant
    Filed: March 6, 2009
    Date of Patent: November 23, 2010
    Assignee: Microsoft Corporation
    Inventors: Gary J. Sullivan, Stephen J. Estrop
  • Patent number: 7836194
    Abstract: Latency in a real-time electronic communication is dynamically managed. A communication delay arising from a receiving data buffer is measured and a latency adjustment necessary to adjust the size of the communication delay to within a predetermined range and an optimal range for a size of the communication delay are determined. Using these parameters, the number of samples for an audio playback data block passing through the receiving data buffer is modified.
    Type: Grant
    Filed: October 5, 2007
    Date of Patent: November 16, 2010
    Assignee: AOL Inc.
    Inventors: John Mantegna, Shuwu Wu
  • Patent number: 7826567
    Abstract: Receivers (1) for receiving frequency signals are, to improve their time synchronization accuracy, provided with synchronization stages (20) for performing a coarse time synchronization through autocorrelating samples of a group of preamble symbols (t1,t2,t3) and a fine time synchronization through crosscorrelating samples of a further group of preamble symbols (t10,G1) with predefined samples. The synchronization stages (20) also perform a coarse and a fine frequency synchronization through detecting and accumulating phases of samples of a yet further group of preamble symbols (t8,t9) and of another group of preamble symbols (T1,T2). The synchronization stages (20) have buffering units (21) and controlling units (22) for controlling mixing units (11) and transformating units (12) in processing stages (10). The preamble symbols have ten short preamble symbols (t1-t10), a guard interval preamble symbol (G 1) and two training symbols (T 1,T2).
    Type: Grant
    Filed: July 6, 2004
    Date of Patent: November 2, 2010
    Assignee: NXP B.V.
    Inventors: Paulus Wilhelmus Franciscus Gruijters, Lucas Hendrikus Gerardus Tan
  • Patent number: 7822071
    Abstract: Disclosed are a method of and system for enabling the transport of timer protocols over a generic frame procedure (GFP) network. The method comprises the steps of transmitting a defined optical initialization sequence to a GFP mapper, and using that GFP mapper to detect the optical initialization sequence and to generate a specified GFP frame to represent the initialization sequence. This specified GFP frame is recognized as a control frame for timer initialization. In a preferred embodiment, the timer protocol uses biphase encoding to encode clock data, and the method comprises the further steps of recovering clock data from a data stream that uses the biphase encoding, detecting a clock rate in that data stream, and using a look up table to map said detected clock rate into a specific code for said control frame.
    Type: Grant
    Filed: August 30, 2006
    Date of Patent: October 26, 2010
    Assignee: International Business Machines Corporation
    Inventor: Casimer M. DeCusatis
  • Patent number: 7822867
    Abstract: A method is provided for sending data packets from a server to a client. A stream of data packets from the server to the client is composed of a main stream P, a retransmission stream R, and an advance stream A. P and A are fixed when R is zero. A is zero and the sum of P and R are fixed when R is not zero or when the client has accumulated data beyond a given threshold. A packet sent by the server but not received by the client is sent again to the client a given time after it was first sent. A packet sent by the server but not received by the client is sent again to the client only if the latter has already previously received a given number of packets sent by the server.
    Type: Grant
    Filed: January 4, 2008
    Date of Patent: October 26, 2010
    Assignee: Thales
    Inventors: Florent Durrey, Frédéric Trinquecoste
  • Patent number: 7817676
    Abstract: A system, method, and computer program product for synchronizing time between a centralized controller device and at least one subscriber device on a fiber access network. The control layer of a network device is expanded, and additional messaging control is added via the transmission of data frames. The expansion prevents reliance on a physical layer signal. The time synchronization also allows a time stamp to be incorporated into a message. Thus, bandwidth is not wasted by simply transmitting a time stamp by itself. In an embodiment, the centralized controller device measures the time difference between the time at which a particular ranging request is transmitted and the time at which the particular ranging request is received. The time difference represents the time adjustment value for the particular subscriber device and allows the device to synchronize its time with that of the centralized controller device.
    Type: Grant
    Filed: August 13, 2007
    Date of Patent: October 19, 2010
    Assignee: Broadcom Corporation
    Inventors: Dolors Sala, Ajay Chandra V. Gummalla
  • Patent number: 7817568
    Abstract: Provided are a method for measuring characteristics of a path between nodes by using active testing packets based on priority, i.e., an inter-node path characteristic measuring method, which can measure and provide characteristics of a generated node, when an inter-node data transmission path is generated based on Multi-Protocol Label Switching (MPLS) to provide a path with satisfactory transmission delay, jitter and packet loss that are required by a user, and to provide a computer-readable recording medium for recording a program that implement the method. The method includes the steps of: a) synchronizing system time of the nodes with a global standard time; b) forming each testing packet; c) registering frame sequence and the global standard time during transmission; and d) calculating transmission delay time, jitter and packet loss by using time stamp and packet sequence information of a frame received by the destination node and transmitting the result to the management system.
    Type: Grant
    Filed: May 7, 2004
    Date of Patent: October 19, 2010
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Euihyun Paik, Tae-Il Kim, Hyeong-Ho Lee
  • Patent number: 7813382
    Abstract: A method of synchronizing a network includes transmitting a tone signal to convey time information and setting a local time according to the conveyed time information. The method may also include detecting an occurrence of a predefined aspect of the tone signal, and setting a local time based on the occurrence of the predefined aspect of the signal.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: October 12, 2010
    Assignee: Robert Bosch GmbH
    Inventors: Arati Manjeshwar, Lakshmi Venkatraman, Bhaskar Srinivasan
  • Patent number: 7813383
    Abstract: Systems and methods are provided for the transmission of waveforms. The method includes inserting at least one TDM pilot symbol located at a transition between wide area and local area waveforms to facilitate decoding of the transmission block.
    Type: Grant
    Filed: March 9, 2006
    Date of Patent: October 12, 2010
    Assignee: QUALCOMM Incorporated
    Inventors: Michael Mao Wang, Bojan Vrcelj, Krishna Kiran Mukkavilli, Raghuraman Krishnamoorthi, Ashok Mantravadi
  • Patent number: 7809046
    Abstract: In one embodiment, a timing-offset estimator calculates a correlation value for each sample of an OFDM signal having a cyclic prefix for each OFDM symbol. The correlation value is provided to a tapped delay line that applies a separate weight to each of 2V correlation values, where V is the length of the cyclic prefix and the weights are based on a triangular weighting scheme that increases linearly from the first value, peaks at the Vth value, and decreases linearly to the 2Vth value. A stream of combined, squared correlation values is generated by combining and squaring the 2V weighted correlation values for each sample of the OFDM signal. For each cyclic prefix of the OFDM signal, a timing-offset estimate is determined based on a detected peak value in the stream of combined, squared correlation values. A timing-offset estimator with triangular weighting scheme may be implemented using recursive processing.
    Type: Grant
    Filed: October 3, 2007
    Date of Patent: October 5, 2010
    Assignee: Agere Systems Inc.
    Inventors: Syed Mujtaba, Xiaowen Wang
  • Patent number: 7801184
    Abstract: Disclosed is an adaptive method for training a source synchronous parallel receiver. The adaptive method for training, or aligning, parallel data channels permits a parallel communication receiver to adaptively adjust the timing of data channels to align the data channels with a frame channel and achieve a source synchronous signal for the parallel data channels. Further, portions of the frame channel training pattern may be used because possible time shift accuracy error is accounted for between the communication channels and a determination is made as to which portion of the frame pattern is currently being received. The data channels are then aligned appropriately.
    Type: Grant
    Filed: May 31, 2005
    Date of Patent: September 21, 2010
    Assignee: LSI Corporation
    Inventors: Christopher D. Paulson, Timothy D. Thompson, Kevin T. Campbell
  • Patent number: 7792156
    Abstract: Apparatus having corresponding computer programs comprise: a code generator adapted to generate a transmitter identification block, wherein the transmitter identification block comprises 32 rows and 82 columns, wherein the first 66 symbols in each of the rows comprises a cyclically-extended 63-chip pseudonoise code that is selectively polarity-inverted according to a respective phase of a 32-chip Walsh code, and wherein each of the last 16 columns comprises a parity-extended 31-chip Gold code that is selectively polarity-inverted according to a respective phase of a 16-chip Walsh code; and a code inserter adapted to insert each of the rows into the reserved block of a respective one of 32 consecutive field synchronization segments in an Advanced Television Systems Committee (ATSC) television signal prior to transmission of the ATSC television signal.
    Type: Grant
    Filed: January 11, 2009
    Date of Patent: September 7, 2010
    Assignee: Rosum Corporation
    Inventors: Andy Lee, James J. Spilker, Jr., Matthew Rabinowitz
  • Patent number: 7792233
    Abstract: A packet preamble search method is disclosed for locating a packet preamble with multiple predetermined patterns of a regular form within a received transmission signal with sequential multiple patterns. The pattern of the received transmission signal and the predetermined pattern of the packet preamble have the same length with even bits. The pattern of the transmission signal is sequentially compared with the predetermined pattern. A hit count is increased and a miss count is reset when the pattern of the transmission signal matches the predetermined pattern. The miss count is increased and the hit count is decreased when the pattern of the transmission signal does not match the predetermined pattern. The hit count and the miss count are reset when the hit count is less than or equal to the miss count. An address matching procedure is activated when the hit count exceeds or is equal to a threshold value.
    Type: Grant
    Filed: July 3, 2006
    Date of Patent: September 7, 2010
    Assignee: Princeton Technology Corporation
    Inventors: Jia-Yu Yang, Wen-Jan Lee, Kwo-Wei Chang