Synchronization Information Is Distributed Over Multiple Frames Patents (Class 370/510)
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Patent number: 7912033Abstract: 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: GrantFiled: January 4, 2006Date of Patent: March 22, 2011Assignee: Olympus CorporationInventors: Ghobad Heidari-Bateni, Stanislaw Czaja
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Patent number: 7885671Abstract: 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: GrantFiled: July 6, 2006Date of Patent: February 8, 2011Assignee: Samsung Electronics Co., LtdInventors: 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
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Patent number: 7885250Abstract: 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: GrantFiled: February 3, 2005Date of Patent: February 8, 2011Assignee: Koninklijke Philips Electronics N.V.Inventor: Tim Whittaker
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Patent number: 7860132Abstract: 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: GrantFiled: October 27, 2009Date of Patent: December 28, 2010Assignee: Texas Instruments IncorporatedInventor: Sundararajan Sriram
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Patent number: 7855994Abstract: In a mobile communication system, multiple transceivers perform radio communications in the same frequency band.Type: GrantFiled: April 26, 2006Date of Patent: December 21, 2010Assignee: NTT DoCoMo, Inc.Inventors: Hiromasa Fujii, Takatoshi Sugiyama, Hitoshi Yoshino
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Patent number: 7839895Abstract: 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: GrantFiled: March 6, 2009Date of Patent: November 23, 2010Assignee: Microsoft CorporationInventors: Gary J. Sullivan, Stephen J. Estrop
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Patent number: 7839839Abstract: 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: GrantFiled: October 13, 2008Date of Patent: November 23, 2010Assignee: Applied Micro Circuits CorporationInventors: Matthew Brown, Dimitrios Giannakopoulos, Jim Lew, Michael John Hellmer
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Patent number: 7836194Abstract: 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: GrantFiled: October 5, 2007Date of Patent: November 16, 2010Assignee: AOL Inc.Inventors: John Mantegna, Shuwu Wu
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Patent number: 7826567Abstract: 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: GrantFiled: July 6, 2004Date of Patent: November 2, 2010Assignee: NXP B.V.Inventors: Paulus Wilhelmus Franciscus Gruijters, Lucas Hendrikus Gerardus Tan
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Patent number: 7822867Abstract: 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: GrantFiled: January 4, 2008Date of Patent: October 26, 2010Assignee: ThalesInventors: Florent Durrey, Frédéric Trinquecoste
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Patent number: 7822071Abstract: 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: GrantFiled: August 30, 2006Date of Patent: October 26, 2010Assignee: International Business Machines CorporationInventor: Casimer M. DeCusatis
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Patent number: 7817568Abstract: 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: GrantFiled: May 7, 2004Date of Patent: October 19, 2010Assignee: Electronics and Telecommunications Research InstituteInventors: Euihyun Paik, Tae-Il Kim, Hyeong-Ho Lee
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Patent number: 7817676Abstract: 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: GrantFiled: August 13, 2007Date of Patent: October 19, 2010Assignee: Broadcom CorporationInventors: Dolors Sala, Ajay Chandra V. Gummalla
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Patent number: 7813382Abstract: 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: GrantFiled: September 30, 2005Date of Patent: October 12, 2010Assignee: Robert Bosch GmbHInventors: Arati Manjeshwar, Lakshmi Venkatraman, Bhaskar Srinivasan
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Patent number: 7813383Abstract: 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: GrantFiled: March 9, 2006Date of Patent: October 12, 2010Assignee: QUALCOMM IncorporatedInventors: Michael Mao Wang, Bojan Vrcelj, Krishna Kiran Mukkavilli, Raghuraman Krishnamoorthi, Ashok Mantravadi
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Patent number: 7809046Abstract: 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: GrantFiled: October 3, 2007Date of Patent: October 5, 2010Assignee: Agere Systems Inc.Inventors: Syed Mujtaba, Xiaowen Wang
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Patent number: 7801184Abstract: 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: GrantFiled: May 31, 2005Date of Patent: September 21, 2010Assignee: LSI CorporationInventors: Christopher D. Paulson, Timothy D. Thompson, Kevin T. Campbell
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Patent number: 7792233Abstract: 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: GrantFiled: July 3, 2006Date of Patent: September 7, 2010Assignee: Princeton Technology CorporationInventors: Jia-Yu Yang, Wen-Jan Lee, Kwo-Wei Chang
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Patent number: 7792156Abstract: 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: GrantFiled: January 11, 2009Date of Patent: September 7, 2010Assignee: Rosum CorporationInventors: Andy Lee, James J. Spilker, Jr., Matthew Rabinowitz
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Patent number: 7764713Abstract: Synchronization of related packet data network streams is provided. Synchronization is achieved by inserting synchronization packets into data streams that are to be aligned with one another after transmission of those data streams across a network. More particularly, corresponding synchronization packets are inserted into the corresponding data streams at the same time, to serve as markers for performing synchronization of the data at the receiving end. The corresponding data streams may comprise an audio data stream and a corresponding video data stream.Type: GrantFiled: September 28, 2005Date of Patent: July 27, 2010Assignee: Avaya Inc.Inventors: Cherian Abraham, Timothy Connal Delaney, Nevill Inglis, Karen Phelan, Luke Anthony Tucker
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Patent number: 7760793Abstract: 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: GrantFiled: October 4, 2006Date of Patent: July 20, 2010Inventors: Ülo Parts, Anders Østergaard Nielsen, Kaj Jansen
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Patent number: 7756166Abstract: In a transmission system with a transmitter coupled to a receiver a main signal encoded according to a coding property is transmitted together with an auxiliary signal (AUX). In order to transmit the auxiliary signal without needing additional space in the transmission frame, the auxiliary signal is transmitted by changing the coding property according to a predetermined sequence. This is done by means of the sequencer. In the receiver, the decoding of the predetermined sequence is performed by a decoder.Type: GrantFiled: September 27, 2006Date of Patent: July 13, 2010Assignees: Koninslijke Philips Electronics, N.V., Sharp CorporationInventors: Constant P. M. J. Baggen, Arie G. C. Koppelaar, Ewa B. Heckstra
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Patent number: 7724781Abstract: A receive virtual concatenation processor (processor) is adapted to receive time-slot interleaved data carried over SONET/SDH frames. The processor first generates per time-slot data and subsequently generates per channel data. The processor supports virtual concatenation, contiguous concatenation as well as mixed concatenation in which some channels are contiguously concatenated and others are virtually concatenated. The processor supports virtual concatenation at both STS-1 and STS-3c granularities and with arbitrary differential delay among constituent time-slots. The processor supports contiguous concatenation with any multiple of STS-3c granularity. The processor is highly scalable to support multiple channels and different frame sizes such as STS-12, STS-48, STS-192, etc.Type: GrantFiled: August 30, 2002Date of Patent: May 25, 2010Assignee: PMC-Sierra, Inc.Inventors: Zhao Wu, Heng Liao
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Patent number: 7724779Abstract: This invention provides a transmission system and control method capable of reliably transmitting real-time data. A switching device and router each serving as an intermediate device mediate an iso-data packet sent from each iso-data server to a predetermined terminal at a timing designated by an iso-packet from the iso-server. If a plurality of iso-data packets conflict in the transmission path, the switching device and router collectively continuously output the plurality of iso-data packets.Type: GrantFiled: March 23, 2006Date of Patent: May 25, 2010Assignee: Canon Kabushiki KaishaInventors: Kazuhiko Morimura, Kenichi Morikawa, Jun Kawashima
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Patent number: 7721001Abstract: Systems and methods are disclosed for time synchronization of operations in a control system. Synchronization networks and devices are provided for transferring synchronization information between controllers in a distributed or localized control system, which is employed in order to allow operation of such controllers to be synchronized with respect to time. Also disclosed are synchronization protocols and hardware apparatus employed in synchronizing control operations in a control system.Type: GrantFiled: December 6, 2005Date of Patent: May 18, 2010Assignee: Rockwell Automation Technologies, Inc.Inventors: Mark Flood, Anthony Cachat, Mark Ruetty, Steven Zuponcic
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Patent number: 7715559Abstract: An apparatus (213) and corresponding methods (FIG. 7) to facilitate maintaining crypto synchronization while processing communication signals in a communication unit includes a vocoder (215) configured to convert input audio band signals to vocoder output frames; a crypto processor (217) configured to encrypt the vocoder output frames to provide encrypted output frames; and a synchronizer (219) configured to substitute in a predetermined manner synchronization information corresponding to an encryption state of the crypto processor for a portion of the encrypted data in a portion of the encrypted output frames to provide resultant output synchronization frames suitable for synchronizing a decryption process at a target communication unit.Type: GrantFiled: August 26, 2004Date of Patent: May 11, 2010Assignee: Motorola, Inc.Inventors: Bradley J. Rainbolt, Marc A. Boillot
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Patent number: 7701979Abstract: Disclosed is a Residential Ethernet node apparatus for maintaining a starting point of a superframe, the Residential Ethernet node apparatus comprising a synchronous queue for receiving and temporarily storing synchronous data, in order to transmit the synchronous data by inserting the synchronous data into a transmission cycle, a parser for receiving asynchronous frames from at least one exterior source, parsing the asynchronous frames according to characteristics of the asynchronous frames, a plurality of the asynchronous queues for separately storing the asynchronous frames received from the parser according to the characteristics of the asynchronous frames, a scheduler for receiving the asynchronous frames from the asynchronous queues, and transmitting the received asynchronous frame when it is possible to transmit the received asynchronous frame, and a multiplexer, which receives a synchronous frame from the synchronous queue and an asynchronous frame from the scheduler so as to transmit the synchronousType: GrantFiled: June 1, 2006Date of Patent: April 20, 2010Assignee: Samsung Electronics Co., Ltd.Inventors: Jae-Hun Cho, Sang-Ho Kim, Yun-Je Oh, Jong-Ho Yoon, Han-Kyun Jung
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Patent number: 7630408Abstract: 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: GrantFiled: June 26, 2003Date of Patent: December 8, 2009Assignee: Texas Instruments IncorporatedInventor: Sundararajan Sriram
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Patent number: 7630406Abstract: Embodiments of methods and apparatus for providing a delayed attack protection system for network traffic are generally described herein. Other embodiments may be described and claimed.Type: GrantFiled: November 4, 2005Date of Patent: December 8, 2009Assignee: Intel CorporationInventors: Kapil Sood, Jesse Walker, Emily H. Oi
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Patent number: 7626975Abstract: Transmission of broadcast streams in multiple sectors is synchronized based on time stamps or sequence numbers in data packets received at the base station. The base stations use the time stamps to calculate a frame transmission start time and start position for the data packets. The base station monitors the packet latency of data within its buffer based on the time stamp in the data packets and initiates a resynchronization procedure if the packet latency exceeds predetermined bounds.Type: GrantFiled: November 4, 2004Date of Patent: December 1, 2009Assignee: Telefonaktiebolaget LM Ercisson (publ)Inventors: Erik Colban, Srinivasan Balasubramanian, Irfan Khan
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Patent number: 7620135Abstract: A data processing apparatus receives a message containing a sync break interval with a unique bit pattern and a sync field interval identified by the sync break interval. A timing property of the sync field interval specifies the length of bit periods of the message. A clock source circuit supplies a sampling clock signal to define time points for sampling bits from the message. The clock source circuit adapts a frequency of the sampling clock signal to the timing property of the sync field interval.Type: GrantFiled: August 13, 2003Date of Patent: November 17, 2009Assignee: NXP B.V.Inventors: Franciscus Johannes Klosters, Patrick Willem Hubert Heuts, Joris Rudolf Beverloo, Hendrik Bernard Heule
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Patent number: 7613212Abstract: A centralized clock distribution mechanism for synchronous TDM communications traffic transported over asynchronous networks such as Ethernet networks. The centralized clocking mechanism of the present invention distributes a high accuracy central clock source to a plurality of CES modules over an Ethernet network. Clock synchronization information based on a high quality clock reference source is distributed to circuit emulation service (CES) modules in the network. CES modules receive the clock synchronization information and use it to reconstruct a local clock. A plurality of clock distributors provide clock redundancy whereby each CES module selects the best clock source to use in reconstructing the local clock.Type: GrantFiled: June 10, 2003Date of Patent: November 3, 2009Assignee: Atrica Israel Ltd.Inventors: Yaron Raz, Pavel Hardak, Amir Lahat, Alex Arnon, Gila Klein
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Patent number: 7593738Abstract: A method and system are specified to determine, provide, and exploit the precise time base relations between the distinct signal timings of the Global Positioning System (GPS) and a wireless communications system (WCS) for which the internal WCS downlink time base standards are not inherently synchronized to GPS timing. These downlink signal synchronization facilities are particularly beneficial for a wireless location system (WLS) and related methods and subsystems that provide mobile-station location determination through the exploitation of the time base synchronization information, e.g., to assist a GPS-equipped mobile station in determining its GPS-derived measurements with enhanced efficiency and accuracy.Type: GrantFiled: December 29, 2005Date of Patent: September 22, 2009Assignee: TruePosition, Inc.Inventor: Robert J. Anderson
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Patent number: 7574224Abstract: A wireless terminal using OFDM signaling supporting both terrestrial and satellite base station connectivity operates using conventional access probe signaling in a first mode of operation to establish a timing synchronized wireless link with a terrestrial base station. In a second mode of operation, used to establish a timing synchronized wireless link with a satellite base station, a slightly modified access protocol is employed. The round trip signaling time and timing ambiguity between a wireless terminal and a satellite base station is substantially greater than with a terrestrial base station. The modified access protocol uses coding of access probe signals to uniquely identify a superslot index within a beaconslot. The modified protocol uses multiple access probes with different timing offsets to further resolve timing ambiguity and allows the satellite base station access monitoring interval to remain small in duration.Type: GrantFiled: July 18, 2005Date of Patent: August 11, 2009Assignee: QUALCOMM IncorporatedInventors: Frank A. Lane, Rajiv Larola, Junyi Li
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Patent number: 7561599Abstract: A method for providing reliable multicasting is described. A transmitted multicast packet is received at second devices, each of which in response transmits a first acknowledgement. If a second acknowledgement, which acknowledges the first acknowledgement, is not received within a predetermined time period, the first acknowledgement is retransmitted. If all first acknowledgements are not received within a preset time period, the multicast packet is retransmitted. If the retransmitted multicast packet has been received, at each of the second devices, if the second acknowledgement has not been received the first acknowledgement is retransmitted, while if the second acknowledgement has been received, the retransmitted multicast packet is ignored and no additional first acknowledgement is transmitted.Type: GrantFiled: September 19, 2005Date of Patent: July 14, 2009Assignee: Motorola, Inc.Inventors: Randy L. Ekl, Anthony R. Metke
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Patent number: 7555196Abstract: Methods and systems for indexing programs are described. In accordance with one embodiment, program data associated with a program recorded on a first entertainment system is processed sufficient to create one or more signatures. The signatures define points of reference that can be utilized to synchronize timecodes associated with other recorded versions of the program from which the signatures were created. One or more indices are created and associated with the program from which the signatures were created. An index file can be created and can contain the created indices as well as the created signatures. A client system that receives the index file can use the signatures to synchronize the timecode on its recorded version of the program with a timecode of the program from which the signatures were created. Once the timecodes are synchronized, the client system can locate the same indices on its recorded version of the program.Type: GrantFiled: September 19, 2002Date of Patent: June 30, 2009Assignee: Microsoft CorporationInventors: Jeffrey D. Crawford, Thomas H. Taylor, Peter J. Potrebic
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Patent number: 7555017Abstract: Method and Apparatus for delivering audio signals from a source node to a destination node on a network. The apparatus uses a number of switches that transmit prioritized data on a packet network. The switches are coupled to a number of send/receive nodes for sending and receiving digital audio signals on the data network. The audio packet size and the receive buffers are sized to store a minimum possible number of audio samples to minimize latency in processing audio signals arriving at said receive node, but still ensure audio delivery without interruption due to packet data network delay. An additional feature of the invention is recovery of clock synchronization over the same data network by novel arrangement of transmission of timing packets on the network.Type: GrantFiled: April 3, 2003Date of Patent: June 30, 2009Assignee: TLS CorporationInventors: Gregory F. Shay, Steven Gray Church
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Patent number: 7551611Abstract: A control unit produces a packet signal composed of a plurality of streams, based on a plurality of inputted data signals. For each of a plurality of data signals, a baseband processing unit multiplies the produced packet signal by a weight vector. The control unit appends a common known signal to a header portion of a plurality of data signals, and appends a dedicated known signal to a front part preceding a data signal by which a dedicated weight vector is to be multiplied, in the plurality of data signals. Of the produced packet signal, the baseband processing unit multiplies the dedicated known signal and a data signal assigned posterior to this dedicated known signal by the dedicated weight vector, and of the produced packet signal it multiplies a part by which no dedicated weight vector is to be multiplied, by a common weight vector.Type: GrantFiled: September 19, 2006Date of Patent: June 23, 2009Assignee: Sanyo Electric Co., Ltd.Inventor: Seigo Nakao
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Patent number: 7542479Abstract: The present invention discloses a device and method for implementing multi-port service convergence. The device at least comprises a clock & data recovery module, a encapsulating module, a mapping module, a de-mapping module and a decapsulating module, and further comprises at least one branch clock generating and adjusting module for determining transmitting clock frequency information of decapsulated service data and adjusting local branch clock frequency based on the transmitting clock frequency.Type: GrantFiled: August 16, 2004Date of Patent: June 2, 2009Assignee: Huawei Technologies Co., Ltd.Inventors: Li Zeng, Jingling Liao, Xiaohong Wei
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Patent number: 7542486Abstract: A method for processing an incident pulsed signal of an ultra wide band type received over a channel by a data device operating in a wireless data communications system is provided. The incident pulsed signal carries information within a super-frame structure. Upon reception of each super-frame structure by a data device, coarse synchronization is performed with another data device acting as a coordinator device for the wireless data communications system. The coarse synchronization uses a first training sequence. Upon reception of each frame allocated to the data device operating within the super-frame structure, channel estimation is performed using a second training sequence. The channel estimation also performs a frame synchronization.Type: GrantFiled: March 3, 2004Date of Patent: June 2, 2009Assignee: STMicroelectronics N.V.Inventor: Chiara Cattaneo
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Patent number: 7539219Abstract: A method and apparatus is provided for synchronizing both the initiation of playback of digital multimedia data in one or more receivers and the rate of playback of the digital multimedia data in the one or more receivers, all receiving the digital multimedia data from a single transmitter, without transmitting clock or timing signals to the receiver(s). An exemplary embodiment is described using the AC powerline as a medium of transmission, although the method and apparatus are adaptable to a variety of communication media.Type: GrantFiled: May 12, 2005Date of Patent: May 26, 2009Assignee: RadioShack CorporationInventors: Sze Ming Patrick Kwong, Man Lung Alan Lam, Tun Oo Maung
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Patent number: 7532566Abstract: Systems and methods for orthogonal frequency division multiplexing multipoint-to-point communications systems are provided. In one embodiment, a method comprises: establishing communication between a first remote unit of a plurality of remote units and a host unit, the plurality of remote units communicatively coupled to the host unit in a multipoint-to-point configuration; receiving an address code assignment from the host unit, the address code to be used in communicating with the host unit, wherein the address code is unique among the plurality of remote units; and transmitting up to a plurality of tones from the first remote unit, the up to a plurality of tones modulated with upstream information using orthogonal frequency division multiplexing.Type: GrantFiled: May 10, 2007Date of Patent: May 12, 2009Assignee: ADC Telecommunications, Inc.Inventors: Michael J. Geile, Michael J. Fort
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Patent number: 7526302Abstract: The invention relates to a method of synchronizing a mobile station with a base station in a wireless communications system, to a mobile station for a wireless communications system, as well as to a wireless communications system of this kind. In order to enable faster ultimate synchronization, it is proposed to compare components of the received data not only with a stored synchronization pattern, but also with a stored identification pattern prior to the adaptation of the timing of the mobile station to received data. Already before the synchronization it can thus be determined with a high degree of probability whether received data originates from a desired base station or not. The necessity of checking the contents of packets which are not associated with a desired base station can thus be avoided.Type: GrantFiled: May 29, 2002Date of Patent: April 28, 2009Assignee: DSP Group Switzerland AGInventor: Christopher Stobart
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Patent number: 7505522Abstract: A method of shaping an orthogonal frequency division multiplexing (OFDM) signal spectrum is disclosed. The method comprises receiving an input signal that has a frequency spectrum that includes a frequency peak, and limiting the amplitude of the frequency peak to a predetermined clip level. An orthogonal frequency division multiplexing (OFDM) transmitter is disclosed. The OFDM transmitter comprises an input interface configured to receive an input signal that includes a frequency spectrum that includes a frequency peak, and a processor coupled to the input interface, configured to limit the amplitude of the frequency peak to a predetermined clip level.Type: GrantFiled: October 6, 2004Date of Patent: March 17, 2009Assignee: Staccato Communications, Inc.Inventor: Torbjorn A. Larsson
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Patent number: 7502381Abstract: A network terminal of the present invention includes: a synchronization information frame receiving section for receiving a synchronization information frame from a master terminal; a network information managing section for maintaining the network by being synchronized with the synchronization information frame; a synchronization information frame missing detection section for detecting the missing of the synchronization information frame from the master terminal; a priority list storing section for storing a priority list which defines a synchronization information frame transmission start time in such a manner as to differentiate synchronization information frame transmission start times between the network terminals; and a synchronization information frame transmission section for, in a case where the network terminal acts as a new master terminal of the network system, periodically outputting a synchronization information frame, from the synchronization information frame transmission start time in accordType: GrantFiled: April 1, 2004Date of Patent: March 10, 2009Assignee: Sharp Kabushiki KaishaInventor: Mitsuaki Nakamura
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Patent number: 7483473Abstract: A technique for efficient implementation of pilot signals on a reverse link in a wireless communication system. An access channel is defined for the reverse link such that within each frame, or epoch, a portion is dedicated to sending only pilot symbols. Another portion of the frame is reserved for sending mostly data symbols; however, within this second portion of the frame, additional pilot symbols are interleaved among the data symbols. The pilot symbol or preamble portion of the access channel frame allows for efficient acquisition of the access signal at the base station, while providing a timing reference for determining the effects of multipath fading. In particular, a pilot correlation filter provides a phase estimate from the pilot symbols in the preamble portion, which is then used to decode the data symbols in the payload portion. An access acquisition portion of the receiver uses the phase estimates provided by the pilot correlation filter to process the output of a data symbol correlation filter.Type: GrantFiled: April 11, 2005Date of Patent: January 27, 2009Assignee: IPR Licensing, Inc.Inventors: John E. Hoffmann, George Rodney Nelson, Jr., James A. Proctor, Jr., Antoine J. Rouphael
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Patent number: 7483448Abstract: A method and system for network terminal clock synchronization includes determining a respective round trip delay time from a master terminal to each slave terminal and offsetting the clock of each slave terminal by an amount proportional to the respective determined round trip delay time such that the master terminal and each of the slave terminals have substantially the same point of reference in time. The method and system further include, in response to a trigger signal, determining a respective offset between the master clock of the master terminal and the clocks of each of the slave terminals and offsetting the clocks of each of the slave terminals by an amount proportional to the determined respective offset to synchronize the clocks of each of the slave terminals to the master clock of the master terminal.Type: GrantFiled: March 10, 2004Date of Patent: January 27, 2009Assignee: Alcatel-Lucent USA Inc.Inventors: Rajan Bhandari, Miguel Dajer, Mahendra Tailor
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Patent number: 7477660Abstract: A system and method for frame detection and generation. Each incoming clock-data stream is divided into two independent data streams: a clock path which preserves the timing of the individual clock domains and a data path which multiplexes an arbitrary number of data streams onto a parallel path. A framer array structure implements a context swap and synchronizes the data streams.Type: GrantFiled: May 26, 2005Date of Patent: January 13, 2009Assignee: Infineon Technologies North America Corp.Inventors: Russell D. Homer, Olaf Moeller
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Patent number: 7463618Abstract: A Universal Mobile Telephone System (UMTS) receiver performs slot synchronization using a received primary synchronization channel (PSCH). Subsequent to completion of slot synchronization, the UMTS receiver performs frame synchronization using a received secondary synchronization channel (SSCH) in such a way that the UMTS receiver uses the received primary synchronization channel (PSCH) to detect a change in channel conditions.Type: GrantFiled: August 4, 2003Date of Patent: December 9, 2008Assignee: Thomson LicensingInventors: Louis Robert Litwin, Wen Gao
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Patent number: RE40918Abstract: The method has two possible transmission modes: a first mode whereby a first transmitter (1) sends frames including sufficient auxiliary data to enable a first receiver (2) to acquire frame synchronization in a reliable fashion, said auxiliary data including a synchronization pattern, a second mode in which said first transmitter sends frames including insufficient auxiliary data to enable said first receiver to acquire said frame synchronization in a reliable fashion but, by virtue of a knowledge of said frame synchronization acquired previously, in said first mode, enabling loss of frame synchronization to be determined, loss of frame synchronization by said first receiver being signalled to said first transmitter by a second transmitter (15) changing from said second transmission mode to said first transmission mode and by a second receiver (16) detecting said change of transmission mode, and said second transmitter transmitting in said second mode modified frames including no payload data sequence imitatiType: GrantFiled: April 7, 2005Date of Patent: September 15, 2009Assignee: AlcatelInventor: Pierre Dupuy