Abstract: An architecture for providing high-speed access over frequency-division multiplexed (FDM) channels allows transmission of Ethernet frames and/or other data across a cable transmission network or other form of FDM transport. The architecture involves downstream and upstream FDM multiplexing techniques to allow contemporaneous, parallel communications across a plurality of frequency channels. Furthermore, the architecture allows a central concentrator to support a plurality of remote devices that each has guaranteed bandwidth through connection-oriented allocations of bi-directional data flows. The upstream and downstream bandwidth allocation can support symmetrical bandwidth as well as asymmetrical bandwidth in either direction. As a local network, the architecture supports guaranteed bandwidth for delivery of data flows to a plurality of host devices.

Abstract: A source communication device includes a source network clock to control timing of communicating with other devices in a network, a source streaming clock associated with processing of audio or video data, a time stamp generator to generate a time stamp that includes a source network clock value and a source streaming clock value, and a time stamp insertion mechanism that incorporates the time stamp into a data unit that is to be transmitted to one of the other devices in the network. A sink communication device includes a sink network clock synchronized with the source network clock, a sink streaming clock associated with processing of audio or video data, and a sink time stamp mechanism to compare a sink streaming clock value with the source streaming clock value, and adjust the sink streaming clock based on the comparison.

Abstract: A system and method is provided for phase interpolator based transmission clock control. The system includes a transmitter having a phase interpolator coupled to a master timing generator and a transmission module. The phase interpolator is also coupled to a receiver interpolator control module and/or an external interpolator control module. When the system is operating in repeat mode, the transmitter phase interpolator receives a control signal from a receiver interpolator control module. The transmitter phase interpolator uses the signal to synchronize the transmission clock to the sampling clock. When the system is operating in test mode, a user defines a transmission data profile in an external interpolator control module. The external interpolator control module generates a control signal based on the profile. The transmitter phase interpolator uses the signal to generate a transmission clock that is used by the transmission module to generate a data stream having the desired profile.

Abstract: The invention relates to a method and a system for estimating a symbol time error in a broadband transmission system, comprising: - determination a timing error signal of an input-signal of a discrete Fourier-transformation block (5) in a data symbol stream on the basis of intersymbol correlation using a predetermined period in each received symbol, - selecting as a predetermined period a number of samples of different useful data parts of a symbol, - determining the time error value (?) based on the intersymbol interference of the selected samples of the different parts of said symbol.

Abstract: A method of transmitting over a network a signal comprising a plurality of data elements the method comprising; receiving the signal at a terminal; determining a transmission delay of at least one data element; estimating a first component of the transmission delay; determining a second component of the transmission delay by removing the first component of the transmission delay from the transmission delay; and determining a receiver delay to be applied between receiving at the terminal and outputting from the terminal one of said plurality of data elements, in dependence on the second component of the transmission delay.

Abstract: A passive phase jitter modulation (PJM) tag is charged with power in a continuous wave (CW) section. When receiving a command from a reader, the passive PJM tag must recognize the command and determine exactly when to begin demodulating the command. Only then can the passive PJM tag demodulate the command. To this end, a synchronization apparatus for accurately demodulating a signal input to a PJM tag includes a plurality of correlators correlating a received phase jitter-modulated signal with a template of an internal matched filter which is in the same form as at least a portion of a modified frequency modulation (MFM) flag.

Abstract: A method and system of applying modulated carrier signals to tree networks and processing signals tapped from the tree networks to generate output signals with phase-synchronized carriers are disclosed.

Abstract: A clock extractor extracts clock frequency f2, from a wired data connection. A clock error estimator estimates a first clock frequency error between clock frequency f2 and a clock frequency f1 associated with a local clock of the transmitter. A transmitter sends the first clock frequency error, as a message to a receiver. The transmitter uses a wireless transmitter interface, including a modulator and transmitter radio. The wireless transmitter interface is clocked at clock frequency f1. The transmitter sends data to the receiver. A wireless receiver interface includes a de-modulator and receiver radio. The wireless receiver interface reconstructs clock frequency f1. A clock adder adds the reconstructing clock frequency f1 to the first clock frequency error, resulting in a synthesized clock frequency f2. The receiver clocks a second wired data connection, using the synthesized clock frequency f2.

Abstract: A method of processing data within a controller for a network can include, while frame lock is not established, detecting a first preamble and a second preamble within a data stream of the network (1210, 1235). Biphase units between the first preamble and the second preamble can be counted (1215). Frame lock can be acquired on the data stream responsive to determining that the first preamble and the second preamble are separated by a number of biphase units corresponding to a frame (1235). A synchronization signal indicating that frame lock has been acquired can be output responsive to acquiring frame lock on the data stream (1240).

Abstract: A system for protecting, controlling, and monitoring substation devices of a power system, includes a spare protection and control unit that, when there is a failure in a protection and control unit from among protection and control units that perform a protection and control operation for the substation devices, downloads unit information including software and a device setting value of failed protection and control unit from a database unit and functions as an alternative unit for the failed protection and control unit.

Abstract: The various embodiments include methods, computers and communication systems that enable synchronizing information in a telecommunications system, which may include receiving a first message including communication information to be synchronized from a first domain, receiving a second message including information associated with a communication on a component in a second telecommunication domain, synchronizing information included in the first message with information included in the second message, and sending the synchronized information to a public interface of the first domain. Synchronizing the information included in the first message with information included in the second message may include synchronizing one or more of metering, rating, charging, balance, policy, and contextual information.

Abstract: A method, telecommunication apparatus, and electronic device for detecting a status of a radio link are disclosed. A transceiver 302 may maintain a radio link with a network base station 104. A processor 304 may map channel state information to a synchronization status associated with the radio link based on the received signal and determine the synchronization status via a block error rate estimate in the radio link based on the channel state information.

Abstract: Various embodiments of the systems and methods described herein may be used to compute a minimum variance unbiased estimator by receiving a first OFDM signal at a pilot tone, receiving a second OFDM signal sent in the same frequency band and determining a differential phase metric between the first OFDM signal and the second OFDM signal. In some embodiments, the differential phase metric may be used to diversity combine synchronization statistics. In various embodiments, the differential phase metric may be used to detect a narrow-band interference.

Abstract: An intermittent operative communication apparatus can send data, received from a source communication device, to any receiver communication device at a predetermined interval and wait for receiving data at the predetermined interval. The communication apparatus has a selector for selecting one or multiple receiver communication devices as a reference communication device that gives a reference timing at which the communication apparatus waits for receiving data, and a timing controller for setting a timing, at which the communication apparatus waits for receiving data, to a timing according to operation of any reference communication device.

Abstract: A radio channel estimation result which is an estimation result of a state of a propagation path to a mobile terminal that is a communication target, is generated. Whether a correction operation for correcting a frequency drift of a radio frequency used in radio communication between a radio base station and the mobile terminal has converged or not is determined. Then, a moving speed of the mobile terminal is estimated using only the radio channel estimation result at the time when the correction operation has converged.

Abstract: When the synchronization information, transmitted from a synchronization information output unit of a clock master side device, is detected by a synchronization information detection unit, the clock slave side device associates the synchronization information with the timestamp information at the time of detection of the synchronization information. Based on the timestamp information associated with the currently received synchronization information, the timestamp information associated with at least one synchronization information up to the synchronization information received last time and transmission period information of the synchronization information, a calculation/decision unit decides whether or not a predetermined condition is met. When the condition is met, the calculation/decision unit supplies the currently received synchronization information to a clock synchronization technique function unit.

Abstract: The present invention discloses a method for transmitting parallelization signals of uninterruptible power supplies, which firstly performs a serialization process on parallelization signals by a logic processing unit and then performs synchronous transmission of the parallelization signals of respective node units over a bus. The method for serial transmission of parallelization signals of uninterruptible power supplies according to the invention can be implemented with easy wiring and can achieve a strong anti-interference ability, ensure real time signal transmission over a guaranteed transmission distance and identify conveniently the failure of a parallelization line while satisfying fundamental transmission demands.

Abstract: A clock data recovery (CDR) circuit occupies a small area required in a high-integration semiconductor device, electronic device and system and is easy in design modification. The CDR circuit includes a digital filter configured to filter phase comparison result signals received during predetermined periods and output control signals, a driver configured to control the digital filter by adjusting the predetermined periods, and an input/output circuit configured to recognize an input and output of data and clock in response to the control signals.

Abstract: A wireless node clock is periodically synchronized with a wireless access point clock. The wireless access point clock is globally synchronized with other access points in a network. Failure of the access point is detected. A search is performed for a beacon signal of a neighboring wireless access point that is associated with the network. The neighboring access point also has a globally synchronized clock. The wireless node clock is synchronized with the globally synchronized clock of the neighboring wireless access point.

Abstract: A wireless node receives a beacon from a wireless access point. The beacon includes a wireless protocol time synchronization function (TSF) timestamp generated with reference to a global clock for a network. The wireless node synchronizes a counter according to the TSF timestamp. The wireless node receives a global timing offset (GTO) packet from the wireless access point and combines the GTO packet with a counter value to generate a global timestamp.

Abstract: Packet network performance is assessed using transit delay metrics and compliance masks generated at various evaluation nodes of the network. The evaluation nodes may employ network probes that make precise measurements of transit delays and thereby of transit delay variations. Based on the assessments, a master may be added to the network or relocated within the network, rate of timing packets generated by the master may be adjusted up or down, or oscillators used at the slaves may be upgraded.

Abstract: Systems and techniques are disclosed wherein a gated pilot signal can be re-acquired faster by searching a last known pilot offset and/or searching a last coset in which the last pilot signal was found.

Abstract: The present disclosure relates to a synchronization control device and method of slave devices connected to a network capable of synchronizing operations of the slave devices, wherein a communication module generates a first synchronization signal and a second synchronization signal according to a distributed clock function, generating, by a processor, a control data for driving an actuator according to the first synchronization signal, outputting to a driver the control data if a synchronization interrupt is generated by the first synchronization signal, and inputting and processing, by the processor, a reception data of the communication module to generate the control data, and generating a timer interrupt on a period set up by a timer according to control of the processor, and generating, by the processor, the control data to output the generated control data to the driver if the first synchronization signal is not generated but the timer interrupt is generated.

Abstract: A method and system of applying modulated carrier signals to tree networks and processing signals tapped from the tree networks to generate output signals with phase-synchronized carriers are disclosed.

Abstract: Certain aspects of a method and system for satellite communication are disclosed. Aspects of one method may include a receiver that handles digital video broadcasting. The receiver may be enabled to dynamically vary spacing between one or more pilots within at least one frame based on a determined symbol rate. The size of each of a plurality of received programs may be determined and the spacing between one or more pilots may be dynamically varied based on the determined size of each of the plurality of received programs.

Abstract: Radio equipment (RE) is shared so as to use a plurality of types of radio signals, and data (IQ data) of the plurality of types of radio signals and monitoring control data are variably arranged in a frame for transmitting and receiving data between the RE and radio equipment controls (RECs). A plurality of types of data are simultaneously transmitted and received by one communication link between the RE and the RECs.

Abstract: In a network including at least two transmission paths whose bands are respectively managed, an RTT test of DTCP-IP may fail due to a relay wait time generated by the band management regardless of retrials. An objective of the present invention is to assure success of the RTT test. A master unit device manages bands of the transmission paths and includes an RTT test detection section detecting a failure of the RTT test, and a band management section modifying a band management (TXOP allocation) schedule based on an RTT test failure detection. With this configuration, a time band during which no TXOP is allocated is provided between the transmission paths whose bands are respectively managed, thereby assuring success of the RTT test.

Abstract: For example, a method of detecting frame marker quality includes: detecting, in a bit-stream sent from a first component to a second component of a common hardware unit, a frame marker having a bit pattern different from an uncorrupted frame marker specified by a communication protocol; and assigning a quality level indicator to the frame marker based on a difference between said bit pattern and a bit pattern of said uncorrupted frame marker.

Abstract: A method for time synchronizing base stations in an asynchronous cellular communication system via multi-communications mode user equipment is described. The method includes receiving time-of-day in a synchronous cellular communication signal with the user equipment operable in a synchronous cellular communications mode. Alternatively, time-of-day is received from a non-cellular system signal with user equipment that is operable to receive signals from the non-cellular system. After time-of-day is received the user equipment is switched to operate in an asynchronous cellular communications mode. Then a frame boundary of a received asynchronous cellular communication signal is time-tagged. Timing information is then transmitted to an entity of the asynchronous cellular communication system to determine time-of-day at the entity.

Abstract: A transmitter including a plurality of input lanes, a substitutor module, and an interleaver module. The plurality of input lanes is configured to receive input symbols including data symbols and idle symbols, wherein the input symbols are arranged into columns of concurrently received input symbols, and wherein each of the columns includes one input symbol from each of the plurality of input lanes. The substitutor module is configured to, at intervals, replace one of the columns with a column of alignment symbols. The substitutor module is further configured to replace an immediately subsequent one of the columns with a column of disposable symbols; and replace one or more immediately subsequent ones of the columns with columns of boundary symbols uninterrupted by disposable symbols. The interleaver module is configured to interleave symbols from the substitutor module between a first transmit lane and a second transmit lane.

Abstract: Telecommunication system based on IP technology, comprising a primary media gateway (1), at least one secondary media gateway (2, 3) to be synchronized onto the primary media gateway (1), and several radio base stations (4-10), at each secondary media gateway (2, 3), at least one radio base station (5, 9) connected to it being provided with a device with which the radio base station (5, 9) can be synchronized onto the emission of another radio base station (4, 8) in order to regenerate the system clock and to transmit it to the connected secondary media gateway (2, 3), and each secondary media gateway (2, 3) being provided with at least one connection for a radio base station (5, 9), through which the regenerated clock can be received and used for controlling the internal clock of the secondary media gateway (2, 3).

Abstract: Techniques are described that can be used to maximize the interference suppression capability of space-time coded systems by managing synchronous transmission signaling. To enhance the probability of the occurrence synchronous interference and accordingly increase interference cancellation capability at a receiver, a network of at least two transmitters in a network may utilize similar structured coding schemes and coordinate transmission so that the receiver receives co-channel signals synchronously.

Abstract: Techniques are described herein that synchronize media streams using time signal(s) from an independent time source. An independent time source is a time source that is independent from (i.e., that is not connected to) an asynchronous data network via which the media streams are transferred. In accordance with the techniques described herein, media server(s) transfer the media streams to client(s) via an asynchronous data network. The independent time source provides the time signal(s) to the media server(s) and/or the client(s). If the time signal(s) are provided to the media server(s), the media server(s) may provide timing information that is based on the timing signal(s) to the client(s). The client(s) use the timing information from the media server(s) and/or the timing signal(s) from the timing source to synchronize the media streams.

Abstract: An effective data sequence based timing error detector (EDS-TED) for baseband transmission system using Tomlinson-Harashima Precoder is disclosed. The EDS-TED extracts timing error information embedded in the received signal to build up autocorrelation between the ESD signals and minimize the mean square error between the received and desired EDS so as to improve the performance of the TED in terms of Peak-to-Peak Jitter and TED gain. Thus the quality of the received signal increases and the error rate decreases.

Abstract: A self-adaptive jitter buffer adjustment method for packet-switched network is presented in this invention, which involves both positive adjustment to jitter buffer and negative adjustment to jitter buffer. The positive adjustment part performs a positive adjustment to the jitter buffer according to an indication of a sequence number of the packet delaying, to absorb larger network jitters by dynamically detecting sequence numbers of the packets in the jitter buffer. The negative adjustment part performs a negative adjustment to the jitter buffer when the filling level descends, to match smaller network jitters by periodically detecting a filling level of the jitter buffer. This invention realizes the dynamic tracking of network jitter, so that a self-adaptive adjustment to the jitter buffer working parameters can be achieved.

Abstract: A method of synchronizing wireless devices includes establishing a recurring sequence of frequency channels at which the wireless devices are to communicate. The frequency channels are divided into a plurality of groups. Synchronization information is transmitted at a respective first frequency channel in each of the groups of frequency channels during a first sampling time period. One of the groups of frequency channels is selected. A wireless device is used to sample each of the frequency channels in the selected group during the first sampling time period. Non-synchronization information is transmitted after the first sampling time period. Synchronization information is transmitted at a next respective frequency channel in each of the groups of frequency channels during a next sampling time period. The next sampling time period occurs after the transmitting of the non-synchronization information.

Abstract: The present disclosure provides a secure one-step IEEE 1588 clock using either a symmetric or asymmetric protection scheme. Clocks of mission-critical or highly-available devices in industrial automation systems connected to a communication network are synchronized by sending, by a master clock, a synchronization message, e.g., a single message of the one-step-clock type according to IEEE 1588, including a time stamp, and by receiving and evaluating, by a slave clock, the synchronization message. A synchronization component or module of the master clock prepares, or composes, prior to a projected send time, a synchronization message including a time stamp of the projected send time, and secures the synchronization message in advance of the projected send time. Securing the synchronization message occurs by suitable cryptographic means allowing for authentication of the time stamp at a receiving slave clock. At the projected send time, the secured synchronization message is transmitted.

Abstract: Techniques are provided for synchronization of sensor signals between devices. One or more of the devices may collect sensor data. The device may create a sensor signal from the sensor data, which it may make available to other devices upon a publisher/subscriber model. The other devices may subscribe to sensor signals they choose. A device could be a provider or a consumer of the sensor signals. A device may have a layer of code between an operating system and software applications that processes the data for the applications. The processing may include such actions as synchronizing the data in a sensor signal to a local time clock, predicting future values for data in a sensor signal, and providing data samples for a sensor signal at a frequency that an application requests, among other actions.

Abstract: Circuitry for decoding data from a pulsed signal received on a single line, the circuitry comprising receiving means for receiving a first edge and a second edge on the single line, the first and second edges being separated by a time period, the time period representing said data; decode circuitry comprising determining means arranged to determine a value of the time period and decoding means arranged to decode said data based on said determined value of the time period; a memory arranged to store a reference value; and calibration means for calibrating said decode circuitry based on a comparison between said determined value of the time period and said reference value, wherein the determining means comprises a plurality of sampling units for sampling said pulsed signal at different times, and selection means for selecting the output of one of said sampling units to decoded.

Abstract: A method is provided for synchronizing time in an unsynchronized vehicle controller area network system. A master control unit receives a global time from a time synchronization source. The master control unit estimates a respective time delay in transmitting messages by electronic control units on each controller area network bus. The time delay is a difference between a time when a message is generated by a respective electronic control unit for transmission on a respective controller area network bus and a time when the message is transmitted on the respective controller area network bus. The global time is adjusted for each respective controller area network bus based on the estimated time delays associated with each respective controller area network bus. Global time messages from the master control unit are transmitted to each electronic control unit that include the adjusted global times for an associated controller area network bus.

Abstract: A method and system for temporally synchronizing a plurality of end systems within a network of end systems is provided. The system includes a synchronizing transmitter communicatively coupled to a message transmitter and to a message receiver of a master physical interface (PHY) device of a first end system of a local area network (LAN) and a synchronizing receiver communicatively coupled to a message transmitter and to a message receiver of a slave PHY device of a second end system of a local area network (LAN), where the synchronizing transmitter is configured to transmit a timing message to the synchronizing receiver using a first differential twisted pair connection and using a second differential twisted pair connection and the synchronizing transmitter is configured to transmit a synchronizing pulse to the synchronizing receiver using the first differential twisted pair connection and using the second differential twisted pair connection.

Abstract: To maintain a synchronized wireless peer group, timing signals may be periodically transmitted by one or more devices in the wireless peer group. These periodic timing signals may be transmitted by different wireless devices in the peer group, distributing (sharing) the transmit power burden among the different wireless devices, increasing the useful operation time of the individual wireless devices. Similarly, the wireless peer group may monitor for timing signals received from devices that are not part of the wireless peer group. This monitoring burden may also be distributed (shared) among the devices in the peer group allowing for a greater sleep time for individual wireless devices, increasing the useful operation time of the individual wireless devices.

Abstract: A node system includes a first node, a second node, and a supervisory node which transmit frames while increasing or decreasing the cycle microtick count, and determines reduced cycle microtick counts by subtracting or adding a rate correction limit value from or to the cycle microtick count of the supervisory node when reception of the first frame transmitted by the first node stop and the cycle microtick count of the supervisory node when reception of the first and second frames stop.

Abstract: A communication system including a plurality of communication devices configured to operate according to a plurality of communication clock signals, respectively, wherein the plurality of communication clock signals are based on a common reference clock signal. The communication system further includes a phase-locked loop configured to generate an output signal in response to the common reference clock signal, wherein the output signal is in phase lock with the common reference clock signal; a signal division controller configured to generate a divider reset signal in response to a binary select signal; and a divider configured to generate one of the plurality of communication clock signals by performing frequency division of the output signal, wherein the divider reset signal controls a start time of the frequency division.

Abstract: With a method for synchronization in a communication system that includes a central participant and at least one further participant, at least one of the further participants being synchronized with the central participant, and, to this end, a telegram with synchronization information being transmitted by the central participant to the at least one further participant, particularly efficient synchronization of the at least one participant with the central participant results due to the fact that the telegram is a data telegram.

Abstract: An apparatus for a base station of a wireless communication network includes a detector to detect an access code received from a mobile station in each of a plurality of time durations and to detect a timing offset of the access code detected in each of the plurality of time durations, an estimator to estimate a carrier-to-interference noise ratio (CINR) during each of the plurality of time durations, and a determining unit to determine a timing offset correction value to be applied to subsequent signals from the mobile station using the CINR, the timing offset, and the access code detected in each of the plurality of time durations.

Abstract: A system and method of transmitting client data encoded according to an 8B/10B encoding between a client side and an optical communication network side, including inserting padding signals in an amount corresponding to a rate difference between a clock on the client side and a clock in the optical transmission device and controlling a clock to be used as a reference in transmitting the client data to synchronize with a clock having been used as a reference in transmitting the client data on the basis of a ratio of padding signals having been inserted in the client data.

Abstract: A method for selecting a clock source in Synchronization Digital Hierarchy (SDH) network and a clock module are provided in the present invention. The method includes: generating a clock information message based on the clock quality information in SDH network, and the clock module of every network node in said SDH network independently selects a clock source by using said clock information message. The method and clock module for selecting a clock source in SDH provided in the present invention enable automatic switch and recovery for a clock source, and effectively solve the problem of clock looping, and adequately maintain the compatibility with the existing system without increasing the cost of the system.

Abstract: A transmission system which couples a plurality of transmission devices to a control device includes a first transmission device which is one of the plurality of transmission devices; a first calculation circuit which calculates a first difference value indicating a frequency difference value between a common clock supplied from the control device and a first clock as a clock used in the first transmission device; and a transmitter which reports the first difference value to a second transmission device other than the first transmission device, wherein the second transmission device comprises: a second calculation circuit which calculates a second difference value indicating a frequency difference value between the common clock and a second clock used in the second transmission device, and a frequency controller which controls an oscillator generating the second clock so that the second difference value approaches the first difference value reported from the first transmission device.

Abstract: Systems and methods for converting a digital input data stream from a first sample rate to a second, fixed sample rate using a combination of hardware and software components. In one embodiment, a system includes a rate estimator configured to estimate the sample rate of an input data stream, a phase selection unit configured to select a phase for interpolation of a set of polyphase filter coefficients based on the estimated sample rate, a coefficient interpolator configured to interpolate the filter coefficients based on the selected phase, and a convolution unit configured to convolve the interpolated filter coefficients with samples of the input data stream to produce samples of a re-sampled output data stream. One or more hardware or software components are shared between multiple channels that can process data streams having independently variable sample rates.