Abstract: The invention is directed to a method and system for providing centralized automated synchronization clock reconfiguration in packet switched telecommunications networks having network nodes that do not implement Synchronization Status Messaging (SSM) internally. This is especially useful when integrating TDM networks with packet switching network elements having T1 and E1 interfaces.

Abstract: Data is synchronized between a mobile device and a computing device over a wireless link. Synchronization operations are scheduled according to a synchronization schedule that is based on a current time of day. In one embodiment, the day can be divided into different time periods by the user. The user can also specify the frequency with which synchronization operations are to be performed during each specified period. Further, the user can specify an override schedule which overrides the ordinary synchronization schedule established by the user when override criteria are present. For instance, if the mobile device is roaming, the synchronization schedule will be dictated by the override schedule, which may sync much less often, or not until a specific user synchronization request has been received. The present invention can be embodied both as a method and as a apparatus.

Abstract: A high speed transceiver without using an external clock signal and a communication method used by the high speed transceiver which applies a clock recovery circuit including a coarse code generator, a frequency detector, and a linear phase detector to the receiver so as to solve problems such as skew between a reference clock and data that may occur during data transmission and jitter of a recovered clock while an embedded clock method of applying clock information to data is used.

Abstract: A first communication apparatus receives, from a second communication apparatus, information indicating the number of relays from a first supplying apparatus to the second communication apparatus. The first communication apparatus receives, from a third communication apparatus, information indicating the number of relays from a second supplying apparatus to the third communication apparatus. The first communication apparatus transmits, to the third communication apparatus, information indicating the number of relays from the first supplying apparatus to the first communication apparatus. The first communication apparatus transmits, to the second communication apparatus, information indicating the number of relays from the second supplying apparatus to the first communication apparatus. The first communication apparatus selects the second communication apparatus, which has a smaller number of relays among the second and the third communication apparatuses.

Abstract: Embodiments related to FEXT estimation and signaling in vectored systems are described and depicted herein.

Abstract: Algorithms and data structure are described for constructing and maintaining a clock distribution tree (“CDT”) for timing loop avoidance. The CDT algorithms and data structure allows a node to make an automated and unattended path switch to the most desirable clock source in the network. In response to a network topology change, a clock root node distributes new clock paths to all nodes in the network. In particular, the root node calculates a new clock path for each affected node by building a clock source topology tree, and identifying from that tree a path to the network node from a clock source of higher or equal stratum relative to that network node. The root node then sends a network message to each node indicating the new path that the node should use. Each node receives the message and compares the new path with the existing path. If the paths are different then the node acquires the new path just received in the message. If the paths are the same then the node does nothing and discards the message.

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.

Abstract: A spare receiver in a CMTS is used to prevent loss of service to subscribers during a failure of a receiver. The beginning of a mass modem de-registration event is detected by the operator or automatically by the CMTS. Upon detection of the beginning of the mass modem de-registration event, the spare receiver matrices to the troubled receiver and is configured according the communication parameters of the troubled receiver. The spare receiver sends communications to one or modems normally registered with the troubled receiver to determine if the mass de-registration event is the result of a failed receiver or a connection problem. In the event of a failed receiver, the spare receiver stays matriced with the troubled receiver and passes communications to/from from modems normally registered with it. The cable operator may swap out the troubled receiver and repair the system without significant loss of service to the subscribers.

Abstract: In one method, an uplink signal carrying at least one block of transmitted samples is transmitted, and a distorted copy of the uplink signal is received as a downlink signal. A plurality of blocks of received samples are generated based on the received downlink signal, and a time delay and frequency offset between the uplink and downlink signals are determined based on a correlation between the block of transmitted samples and at least one of the plurality of blocks of received samples.

Abstract: Certain aspects of a multi-channel signal synchronizer may comprise receiving a plurality of clock signals from a plurality of clock signal sources, wherein a portion of the received plurality of clock signals may be out of synchronization with a remaining portion of the received plurality of clock signals. A plurality of data signals may be received from a plurality of data signal sources, wherein a portion of the received plurality of data signals may be out of synchronization with a remaining portion of the received plurality of data signals. The received portion of plurality of clock signals and data signals may be synchronized to the received remaining portion of plurality of clock signals and data signals utilizing bit alignment and sample alignment. A plurality of synchronized output signals may be generated based on the synchronized received plurality of clock signals and synchronized received plurality of data signals.

Abstract: A method of providing or transporting a timing signal between a number of circuits, electrical or optical, where each circuit is fed by a node. The nodes forward timing signals between each other, and at least one node is adapted to not transmit a timing signal before having received a timing signal from at least two nodes. In this manner, the direction of the timing skew between nodes and circuits is known and data transport between the circuits made easier.

Abstract: The invention relates in general to clock recovery in a communications network, and in particular to clock recovery in a packet based communications network. Methods and apparatus are disclosed for determining a client timing signal 64, 70 for at least one client device 18, 20, 22, 54, 56, 92, 94, 96 at a master device 24, 58, 98. The client timing signal is compared 126 with a reference timing signal 76 of the master device. A timing difference value 36 is then determined 128 between the client timing signal and the reference timing signal. At least one packet indicative of the timing difference value is transmitted 130 from the master device 24, 58, 98 for receipt by the at least one client device for adjusting the client timing signal at the at least one client device.

Abstract: A communication system includes master host unit, hybrid expansion unit, and remote antenna unit. Master host unit communicates analog signals with service provider interfaces. Master host unit and hybrid expansion unit communicate N-bit words of digitized spectrum over communication link. Hybrid expansion unit converts between N-bit words and analog spectrum. Hybrid expansion unit and remote antenna unit communicate analog spectrum over analog communication medium. Remote antenna unit transmits and receives wireless signals over air interfaces. Master host unit includes master clock distribution unit that generates digital master reference clock signal. Master host unit communicates digital master reference clock signal over communication link. Hybrid expansion unit receives digital master reference clock signal from master host unit over communication link and generates analog reference clock signal based on digital master reference clock signal.

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.

Abstract: A method and a device for multi-channel data alignment in a transmission system are provided, wherein the method comprises receiving a first stream data and a second stream data, determining a deleting/inserting state of the first stream data and the second stream data to generate an information of mismatch data due to a speed difference situation, generating a reverse inserting control signal or a reverse deleting control signal to completely restore the original first stream data and/or the original second stream data at a transmission end, deleting/inserting the first stream data and the second stream data simultaneously after receiving the deleting/inserting state of the first stream data and the second stream data, and outputting the corrected first stream data and the corrected second stream data without mismatching.

Abstract: A system, apparatus, method and article to manage wireless connections are described. The apparatus may include a connection management module to automatically form a first connection between a first mobile device and a second mobile device, and a second connection between the second mobile device and a fixed device, wherein the first mobile device is to communicate information with the fixed device using the first and second connections. Other embodiments are described and claimed.

Abstract: Systems and methods providing clocking between various components or sub-components are shown. Embodiments implement an implied clock technique which reduces the number of signal lines, signaling overhead required for an encoded clock signal, and/or and power consumption for a high speed communication link. In accordance with embodiments efficient communication is provided between a core device and a remote device by the core device providing both clock and data signals to the remote device and the remote device providing a data signal at a predetermined clock rate without communicating its clock signal. The core device of this embodiment determines an “implied clock” suitable for accurately receiving data from the remote device.

Abstract: A method and system for sequentially reorganizing signals received on a set of sensors, including a network of aerials or sensors, a high-precision clock, controlling a sequencer and suitable for accurately pacing the switching and acquisition times between each aerial, the sequencer is suitable for controlling an antenna switch, an the antenna switch linked to a single-channel radiofrequency receive module, an acquisition card, and a processing model.

Abstract: A time synchronization device (TSD) that produces a synchronization signal and couples it onto energized power conductors in a power monitoring system. Monitoring devices coupled to the TSD include frequency detection algorithms, such as a Goertzel filter, for detecting the synchronization signal and interpreting the information encoded in the signal. The frequency of the synchronization signal may correspond to the fourth or tenth harmonic component of the fundamental frequency of the voltage on the power conductors. The magnitude of the signal is selected to be above the expected or established noise floor of the power monitoring system plus a predetermined threshold. The duration of the signal can be varied, such as lasting a full cycle of the fundamental frequency. Multiple TSD signals received in a predetermined sequence may be converted into digital words that convey time, configuration, reset, control, or other information to the monitoring device.

Abstract: A radio communication apparatus connected to a device including a digital signal processing unit generating a clock signal, the apparatus includes an acquisition unit acquiring frequency information concerning the clock signal from the digital signal processing unit, a first measurement unit measuring a signal power in a first frequency band, a comparison unit comparing the signal power with a threshold, a first selection unit selecting, from the first frequency band, a second frequency band necessary for data communication, a bandwidth of the first frequency band whose signal power is lower than the threshold being more than a bandwidth of the second frequency band, a second selection unit selecting an optimum communication scheme from a plurality of communication schemes of the data communication according to the frequency information, and a communication unit using the optimum communication scheme to perform the data communication in the second frequency band.

Abstract: A time synchronization method for synchronizing times of a first apparatus and a second apparatus includes transmitting, by the first apparatus, a packet to the second apparatus, the packet including the time of the first apparatus, providing, by a relay apparatus that relays the packet, a value to the packet, the value indicating a reception time upon the reception of the packet, providing, by the relay apparatus, a difference between the value provided to the packet in the providing of reception time and a current time to the packet upon the transmission of the packet, the difference serving as a delay value, and executing, by the second apparatus, a control for time synchronization based on the time of the first apparatus included in the packet and the delay value provided to the packet.

Abstract: A wireless network comprising a plurality of base station capable of communicating with a plurality of mobile station in a coverage area of the wireless network. A first base station transmits an enhanced synchronization identifier parameter to a mobile station. The enhanced synchronization identifier parameter may apply to less than all of the plurality of base stations defined by the System Identifier/Network Identifier (SID/NIC) value associated with the wireless network.

Abstract: A physical layer device including a plurality of ports and a clock synchronization module. Each port of the plurality of ports is programmable to receive a grandmaster clock. The clock synchronization module is configured to i) receive the grandmaster clock from a first port of the plurality of ports (wherein the first port has been programmed to receive the grandmaster clock), and ii) clean up the grandmaster clock, wherein cleaning up the grandmaster clock includes one or more of removing jitter from the grandmaster clock, controlling a voltage swing or the grandmaster clock, or establishing fixed edge rates of the grandmaster clock. Other ones of the plurality of ports, not including the first port, are programmed to receive the cleaned up grandmaster clock for use when transmitting data.

Abstract: In an embodiment, a digital pre-distortion apparatus processes an input signal to produce a pre-distorted signal, and processes the pre-distorted signal to produce a feedback signal. The apparatus also rotates an adjustment gain by a gain rotation angle to produce a rotated adjustment gain, where the gain rotation angle is based on a phase difference between the input signal and the feedback signal. The apparatus also applies the rotated adjustment gain to the feedback signal, which may result in rotation of the feedback signal into a target phase region.

Abstract: A method of operation of a network system including a network line terminal coupled to a slave network unit and a master network unit over a first network includes: calculating a master round trip time between the network line terminal and the master network unit; sending a master message to the slave network unit, the master message having the master round trip time and a master local time; and calculating a slave local time based on the master round trip time and the master local time.

Abstract: A method and arrangement for correlating time in different time bases used by interconnected units by timestamping a reference event with a time determined with respect to a first time base. A message unit provides the time to a second interconnected unit that uses a second time base. A translation device is configured to calculate a difference between the time measured by the first time base and in the second time base. The difference is used to translate a time measured by the first clock to a time in a different time base at run time.

Abstract: A method and apparatus for efficiently transmitting large multimedia data over a wireless network are provided. A wireless device includes a device information reading unit which receives and reads information regarding available capabilities of devices included in a wireless network; a control unit which selects a first device which can process a video stream and a second device which can process an audio stream from the devices based on the information; a stream generation unit which generates a video stream and an audio stream which form the same content; and a wireless transmission/reception unit which transmits the generated video stream to the first device and transmits the generated audio stream to the second device.

Abstract: An integrated circuit input/output interface with empirically determined delay matching is disclosed. In one embodiment, the integrated circuit input/output interface uses empirical information of signal traces coupled to the integrated circuit to adjust a transmit/receive clock of each pin of the interface so as to compensate for delay mismatches caused by differences in signal trace lengths. In one embodiment, values representative of the empirical information are stored for use by the integrated circuit to generate trace-specific signals so as to compensate for delay differences that are at least partially caused by unmatched signal trace lengths. The empirical information, in one embodiment, includes signal flight time of each signal trace, which can be pre-measured or pre-calculated from known signal trace lengths. The empirical information, in another embodiment, includes trace-specific phase offset values calculated from pre-calculated or pre-measured signal flight times or signal trace lengths.

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: A system includes a first communication device and a second communication device. The first communication device includes a programmable region. The programmable region of the first communication device is programmed so that an associated signal includes a number of preamble cycles. The second communication device also can include a programmable region. The programmable region of the second communication device can be programmed so that an associated signal includes a number of preamble cycles. The number of preamble cycles can be based on a variety of factors, such as the topology or implementation of the system. In an embodiment, the number of preamble cycles is associated with a data strobe signal, and data is not read or written in response to the data strobe signal until all of the preamble cycles have been transmitted and received.

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.

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: A deserializer including a plurality of registers, a sync detector, and a lost bit storage unit. If there is a phase difference between an external input data packet and a recovery clock signal transmitted together with the data packet, the sync detector generates an activated sync detect signal. The lost bit storage unit detects a data bit of the data packet corresponding to an activation point of the sync detect signal. The deserializer recovers the data packet by combining the detected data bit with the data packet.

Abstract: A method and apparatus for efficiently transmitting large multimedia data over a wireless network are provided. A wireless device includes a device information reading unit which receives and reads information regarding available capabilities of devices included in a wireless network; a control unit which selects a first device which can process a video stream and a second device which can process an audio stream from the devices based on the information; a stream generation unit which generates a video stream and an audio stream which form the same content; and a wireless transmission/reception unit which transmits the generated video stream to the first device and transmits the generated audio stream to the second device.

Abstract: A clock/data recovery device 1 comprises a sampler 10, a detector 20, an offset determination part 30, a clock output part 40, and a DA converter 50. The phases of clock signals CK and CKX are adjusted so as to match with the phase of an input digital signal. An offset amount (±Voff) added in the sampler 10 is adjusted so as to match with a peak time of a data transition time distribution of a first signal in a case where a value D(n?1) is HIGH level, and is adjusted so as to match with a peak time of a data transition time distribution of a second signal in a case where the value D(n?1) is LOW level. Either of the clock signals CK and CKX is outputted as the recovered clock signal. Time series data of a digital value D(n) is outputted as the recovered data.

Abstract: A device of dynamic communication of information allows, on the average, non-integer bits per symbol transmission, using a compact code set or a partial response decoding receiver. A stream of selectable predetermined integer bits, e.g., k or k+1 data bits, is grouped into a selectable integer number of bit vectors which then are mapped onto corresponding signal constellations forming transmission symbols. Two or more symbols can be grouped and further encoded, so that a symbol is spread across the two or more symbols being communicated. Sequence estimation using, for example, maximum likelihood techniques, as informed by noise estimates relative to the received signal. Each branch metric in computing the path metric of a considered sequence at the receiver is weighted by the inverse of the noise power. It is desirable that the constellation selection, sequence estimation and noise estimation be performed continuously and dynamically.

Abstract: A method and apparatus for detecting symbols in a Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (“MIMO-OFDM”) system. A MIMO-OFDM receiver includes a first detector that estimates a symbol of a first MIMO-OFDM sub-carrier and a second detector that estimates a symbol of a second MIMO-OFDM sub-carrier. The second detector differs in complexity from the first detector. A detector control block is coupled to the detectors. The detector control block assigns the first detector to process the first MIMO-OFDM sub-carrier and assigns the second detector to process the second MIMO-OFDM sub-carrier. The detector control block computes a list metric for a sub-carrier. Based on the list metric the detector control block assigns a candidate symbol list length to the detector processing the sub-carrier. Alternately, the detector control block assigns one of a variety of detector types to a sub-carrier based on the sub-carrier list metric.

Abstract: The present disclosure relates generally to systems and methods for frequency synchronization in a non-hierarchical network. In one example, the method includes receiving, by a node in a wireless non-hierarchical network, frequency synchronization messages from other nodes. The method calculates an average frequency based on the frequency synchronization messages, calculates a control frequency based on the average frequency, and sets an oscillator of the node to the control frequency.

Abstract: An offset frequency estimation method includes receiving an input signal comprised of complex samples, detecting phases of the complex samples, estimating a temporary offset frequency and an initial phase from the detected phases of the complex samples using a linear regression analysis method, and estimating a final offset frequency by skipping error samples detected using the temporary offset frequency and the initial phase.

Abstract: A diamine absorbent that contains heat stable salts is regenerated using an ion exchange process wherein the cation exchange resin is regenerated using sulfurous acid reflux.

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 optical signal return path system analog RF signals are sampled using a master clock frequency, and combined with digital data such as Ethernet data at a cable node. The cable node sends the combined signals on a return path over a fiber optic medium to the cable hub. The cable hub extracts an approximate in-frequency replicate of a master clock signal, and can use the replicate master clock signal to desample the digitized RF signals back to analog. The cable hub can further use the replicate of the master clock signal to serialize Ethernet data, and send the Ethernet data back to the cable node via an optical cable in the forward direction. Accordingly, a single master clock signal can be used on a CATV network for encoding/decoding, and transmitting a variety of data signals, which enhances the integrity and reliability of the data signals.

Abstract: Systems and methods for synchronizing an input signal with a substantial mitigation of race conditions and a substantial increase in resolving time are provided. One embodiment includes a system comprising a first latching device configured to latch a first output signal from the input signal and a delay element configured to receive the first output signal and output a delay signal that is a delayed version of the first output signal. The system also includes a pass-gate element configured to receive the first output signal and to output a second output signal in response to a logic state of the delay signal. The second output signal has a delayed input edge without a delayed resolving edge. The system can be configured to force the first output signal to a stable logic state in response to the first output signal having a metastable state.

Abstract: With the clock data restoration device 1, as a result of the processing of a loop which comprises the sampler section 10, detection section 20, timing determination section 30, and clock output section 40, the respective phases of the clock signal CKXA, clock signal CKXB, and clock signal CK are adjusted to match the phase of the input digital signal, the digital signal sampling time indicated by the clock signal CKXA is adjusted to match the peak time of the distribution of data transition times in a case where the value D (n?2) and value D(n?1) of the preceding two bits differ from one another, and the digital signal sampling time indicated by the clock signal CKXB is adjusted to match the peak time of the distribution of data transition times in a case where the value D (n?2) and value D(n?1) of the preceding two bits are equal to one another.

Abstract: A multiple access technique for a wireless communication system establishes separate channels by defining different time intervals for different channels. In a transmitted reference system different delay periods may be defined between transmitted reference pulses and associated data pulses for different channels. In addition, a multiple access technique may employ a common reference pulse for multiple channels in a transmitted reference system. Another multiple access technique assigns different pulse repetition periods to different channels. One or more of these techniques may be employed in an ultra-wide band system.

Abstract: A host base transceiver station BTS derives a reference timing signal from a physical layer training signal (such as a preamble) received from a neighbor network node/BTS. Downlink transmissions are then synchronized to the derived reference timing signal. This may be used as a holdover timing mode, such as when the host BTS determines that synchronization from a primary source is no longer reliable. In an embodiment, a reference oscillator of the host BTS is phase locked to the derived reference timing signal. Variations include one or multiple such training signals from one or multiple neighbor BTSs, selecting one BTS when the primary synchronization mechanism fails for several BTSs in the same area, and how to phase lock the oscillator without dithering about the target frequency. Apparatus and computer programs are also detailed.

Abstract: A physical layer device comprises a first port that embeds a first clock into data transmitted over a first physical medium; a second port that embeds a second clock into data transmitted over a second physical medium; a first selection module that outputs the first clock to the first port based on one of a locally generated clock and a recovered clock; and a second selection module that outputs the second clock to the second port based on one of the locally generated clock and the recovered clock. A method comprises embedding a first clock into data transmitted over a first physical medium; embedding a second clock into data transmitted over a second physical medium; generating the first clock based on one of a locally generated clock and a recovered clock; and generating the second clock based on one of the locally generated clock and the recovered clock.

Abstract: Data is synchronized between a mobile device and a computing device over a wireless link. Synchronization operations are scheduled according to a synchronization schedule that is based on a current time of day. In one embodiment, the day can be divided into different time periods by the user. The user can also specify the frequency with which synchronization operations are to be performed during each specified period. Further, the user can specify an override schedule which overrides the ordinary synchronization schedule established by the user when override criteria are present. For instance, if the mobile device is roaming, the synchronization schedule will be dictated by the override schedule, which may sync much less often, or not until a specific user synchronization request has been received. The present invention can be embodied both as a method and as a apparatus.

Abstract: A system including a differential demodulation module that receives modulated signals from R antennas and that differentially demodulates the modulated signals to generate differentially demodulated signals, where R is an integer greater than or equal to 1. A summing module sums the differentially demodulated signals to generate a combined signal. A correlation module correlates the combined signal with derived preamble sequences and generates correlation values based on the correlation. The derived preamble sequences are derived from preamble sequences. Each bit of one of the derived preamble sequences has a first state when a corresponding bit and a bit adjacent to the corresponding bit in a corresponding one of the preamble sequences have opposite states. Each bit has a second state when the corresponding bit and the bit adjacent to the corresponding bit have the same state.

Abstract: A data transmission process with auto-synchronised correcting code, auto-synchronised coder and decoder, corresponding transmitter and receiver. According to the invention, synchronisation management signals (HS, SS, ID) are formed and, under the control of these signals, a header is inserted before a data group and after it a correcting code. At receive end, these synchronisation management signals are reconstituted, the presence of a header is detected and any erroneous symbols are corrected. The invention also provides for an auto-synchronised coder and a decoder and for a transmitter and a receiver using them.