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3189 results about "Preamble" patented technology
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A preamble is an introductory and expressionary statement in a document that explains the document's purpose and underlying philosophy. When applied to the opening paragraphs of a statute, it may recite historical facts pertinent to the subject of the statute. It is distinct from the long title or enacting formula of a law.
Rapid discrimination preambles and methods for using the same
InactiveUS20050195930A1Sync fastLess power consumptionEnergy efficient ICTElectrotherapyComputer hardwareSystems approaches
A system, method and program are disclosed for achieving rapid bit synchronization in low power medical device systems. Messages are transmitted via telemetry between a medical device and a communication device. The synchronization scheme uses a portion of a unique preamble bit pattern to identify the communication device allowing for economical communications with a minimum expenditure of energy. A special set of preamble bit patterns are utilized for their unique synchronization properties making them particularly suited for rapid bit synchronization. These unique preamble bit patterns further provide simplification to the preamble error detection logic.
Owner:MEDTRONIC MIMIMED INC
Method and apparatus for preamble training in a multiple antenna communication system
ActiveUS20050276347A1Extended durationSpatial transmit diversityPolarisation/directional diversityCommunications systemBeam steering
Methods and apparatus are provided for communicating data in a multiple antenna communication system having N transmit antennas. According to one aspect of the invention, a header format includes a legacy preamble having at least one legacy long training field and an extended portion having at least N additional long training fields on each of the N transmit antennas. The N additional long training fields may be tone interleaved across the N transmit antennas and are used for MIMO channel estimation. The extended portion may include a short training field for power estimation. The short training field may be tone interleaved across the N transmit antennas and have an extended duration to support beam steering.
Owner:AVAGO TECH INT SALES PTE LTD
Wireless communication system, relay station device and base station device
InactiveUS20060046643A1Repeater circuitsRadio relay systemsCommunications systemInformation transmission
A wireless communication system, relay station device, and base station device reduce dead zones in which communication with the base station device is not possible, and enable expansion of service areas. The BS transmits to the RS burst packets and MAP messages including information providing notification of the timing of information transmission and reception. The RS receives the MAP messages and burst packets. The RS stores, in the Preamble Present bits in MAP messages, information providing notification of the preamble transmission timing to control synchronization of reception by the SSs, and transmits the MAP messages to the SSs. The RS transmits burst packets to which preambles are appended to the SSs.
Owner:KDDI CORP
Preambles in Ofdma System
ActiveUS20080039107A1Reducing a search windowModulated-carrier systemsTransmission path divisionMulti inputCell search
The present invention provides a preamble that is inserted into an OFDMA frame and has a common sequence for all the base stations participating in a transmission. The subscriber station performs fine synchronization using the common sequence on the common preamble, and the resulting peaks will provide the locations of candidate base stations. The base station specific search is then performed in the vicinities of those peaks by using base station specific pseudo-noise sequences. With this two stage cell search, the searching window is drastically reduced. The preamble is matched to known values by a respective receiver to decode the signals and permit multiple signals to be transferred from the transmitter to the receiver. The preamble may comprise two parts, Preamble-1 and Preamble-2, which may be used in different systems, including multioutput, multi-input (MIMO) systems.
Owner:APPLE INC
Random access channal access apparatus for mobile satellite communication system and method therefor
ActiveUS20040014452A1Reduce transmission delay timeIncrease probabilityTransmission control/equalisingNetwork topologiesTelecommunicationsRandom-access channel
The present invention relates to Random Access Channel (RACH) access apparatus for mobile satellite communication system and method therefor. The method for accessing random access channel (RACH) on satellite system, random access channel (RACH) carrying message from a plurality of mobile stations to the satellite system, the method includes the steps of: receiving preamble and the message, the message successively transmitted with the preamble from the plurality of mobile stations; and transmitting acquisition response signal corresponding to the preamble or the message to the plurality of mobile stations. Accordingly, success of packet reception of satellite system is improved and transmission delay is reduced.
Owner:ELECTRONICS & TELECOMM RES INST
Preamble sequencing for random access channel in a communication system
ActiveUS20070165567A1Modulated-carrier systemsTransmission path divisionCommunications systemRandom-access channel
A system and method for initializing a system communication without previous reservations for random access channel (RACH) access includes a first step of defining at least one spread sequence derived from at least one constant amplitude zero autocorrelation sequence. A next step includes combining the spread sequence with a Walsh code to form an extended spread sequence. A next step includes using the extended spread sequence in a preamble for a RACH. A next step includes sending the preamble to a BTS for acquisition. A next step includes monitoring for a positive acquisition indicator from the BTS. A next step includes scheduling the sending of a RACH message. A next step includes sending the RACH message.
Owner:GOOGLE TECH HLDG LLC
Method of performing random access procedure in wireless communication system
ActiveUS20090186613A1Reliable data transmissionSynchronisation arrangementTransmission path divisionCommunications systemResource allocation
A method includes transmitting a random access preamble, receiving a random access response as a response of the random access preamble, wherein the random access response comprises an uplink resource assignment and a request for transmission of a Channel Quality Indicator (CQI), and transmitting the CQI in the uplink resource assignment.
Owner:LG ELECTRONICS INC
User equipment and power control method for random access
An improved power control method and apparatus of a mobile terminal is provided for facilitating random access procedure in a mobile communication system based on a distributed antenna system. A method includes receiving, by the terminal, system information from a base station, the system information including transmit power information for transmitting a random access preamble; calculating a transmit power using the transmit power information; and transmitting the random access preamble using with the calculated transmit power.
Owner:SAMSUNG ELECTRONICS CO LTD
Wireless local area network (WLAN) channel radio-frequency identification (RFID) tag system and method therefor
InactiveUS20040078151A1Network topologiesPosition fixationNetworked Transport of RTCM via Internet ProtocolTelecommunications
A wireless local area network (WLAN) radio-frequency identification (RFID) tag system provides location finding in a wireless local area network (WLAN), using a WLAN channel. Interference with the WLAN is prevented by either using a sniffer circuit to determine that no network transmission is in progress, using a modified coding sequence or preamble to cause standard WLAN receivers to ignore the RFID tag transmissions, or transmitting a message using a standard WLAN signal addressed to an address not corresponding to a unit within the WLAN. Location units (LUs) and a master unit (MU) within the WLAN receive the RFID tag transmissions and can determine the location of a tag by triangulation based on differences between the signals received at the location units from the tag. The master unit receives the signal information from the location units and computes the location of the tag. Time-difference-of-Arrival (TDOA), received signal strength indication (RSSI) or other triangulation techniques may be used.
Owner:AEROSCOUT
Method and apparatus for preamble training in a multiple antenna communication system
ActiveUS8619907B2Spatial transmit diversityPolarisation/directional diversityCommunications systemBeam steering
Owner:AVAGO TECH INT SALES PTE LTD
Method and apparatus for improved long preamble formats in a multiple antenna communication system
ActiveUS7742390B2Modulated-carrier systemsDiversity/multi-antenna systemsCommunications systemTransmitter antenna
Owner:AVAGO TECH INT SALES PTE LTD
Apparatus and method for performing random access in multi-carrier system
InactiveUS20110249641A1Synchronisation arrangementModulated-carrier systemsResponse generationCarrier signal
A method for performing a random access in a multi-carrier system includes transmitting a random access preamble on an uplink component carrier to a base station, and receiving a random access response on a first downlink component carrier. The random access response includes information regarding a second downlink component carrier used to transmit a contention resolution message indicating that a random access collision with other mobile stations are resolved. A base station to perform the method includes a preamble reception unit to receive the random access preamble, a response generation unit to generate the random access response, and a response transmission unit to transmit the random access response. A mobile station to perform the method includes a preamble transmission unit, a response reception unit, a carrier configuration unit, and a message reception unit.
Owner:PANTECH CO LTD
Physical Layer and Data Link Layer Signalling in Digital Video Broadcast Preamble Symbols
Aspects of the invention are directed to physical layer and data link layer signaling in digital video broadcast preamble symbols. Embodiments are directed to distributing physical layer pre-signalling data among preamble symbols. If physical layer data is larger than a predetermined number of preamble symbols, then excess physical layer data is written to data symbols immediately following the preamble symbols in top-down order symbol by symbol or the predetermined number of preamble symbols is increased. If physical layer data is not larger than the predetermined number of preamble symbols such that there is excess preamble symbol space, physical layer pipe 0 data comprising link layer signaling and notification data is carried in the excess preamble symbols or the excess preamble symbols are left empty. Different permutation rules may be used to frequency interleave odd-numbered versus even-numbered orthogonal frequency division multiplexing symbols.
Owner:SAMSUNG ELECTRONICS CO LTD
Pilot Design for Ofdm Systems with Four Transmit Antennas
ActiveUS20080253279A1Reduce distractionsImprove channel estimation performanceSpatial transmit diversityTime-division multiplexEngineeringTransmitter antenna
Pilot, preamble and midamble patterns are provided that are particularly suited for four transmit antenna OFDM systems. Pilots are inserted in a scattered manner for each of the four antennas, either uncoded, space-time coded in pairs, space-time frequency coded in pairs, or space-time-frequency coded.
Owner:APPLE INC
Method and apparatus for handover in a wireless communication system
ActiveUS20080267127A1Effectively contention-freeEliminates and minimizes timeSynchronisation arrangementRadio/inductive link selection arrangementsCommunications systemMobile equipment identifier
A method and apparatus for handover in a wireless communication system. A handover indication can be received from a source base station (120) that is connected with a mobile station (110). The handover indication can include a random access channel preamble. The random access channel preamble can include a temporary mobile equipment identifier. The random access channel preamble can be received from the mobile station. A timing advance message can be sent in response to receiving random access channel preamble. The timing advance message can be addressed by the random access channel preamble and a source base station identifier. The connection with the mobile station can be switched from the source base station to a target base station (130).
Owner:GOOGLE TECH HLDG LLC
System and method for telemetry with an implantable medical device
An implantable medical device (IMD) includes a telemetry module to communicate with an external device according to a given protocol. To establish a communication session, the IMD will extend active periods of reception on a given channel when some confirmed data is received from the external device. In addition, once a session has been opened, the programmer transmits a short data set (or preamble) for each cycle which the IMD is set to receive. This data set indicates whether additional data will or will not be sent. If no additional data is to be sent during that cycle, then the IMD powers down the receiver for that cycle.
Owner:MEDTRONIC INC
Wireless local area network (WLAN) channel radio-frequency identification (RFID) tag system and method therefor
InactiveUS6963289B2Reduce stepsNetwork topologiesPosition fixationTelecommunicationsNetworked Transport of RTCM via Internet Protocol
A wireless local area network (WLAN) radio-frequency identification (RFID) tag system provides location finding in a wireless local area network (WLAN), using a WLAN channel. Interference with the WLAN is prevented by either using a sniffer circuit to determine that no network transmission is in progress, using a modified coding sequence or preamble to cause standard WLAN receivers to ignore the RFID tag transmissions, or transmitting a message using a standard WLAN signal addressed to an address not corresponding to a unit within the WLAN. Location units (LUs) and a master unit (MU) within the WLAN receive the RFID tag transmissions and can determine the location of a tag by triangulation based on differences between the signals received at the location units from the tag. The master unit receives the signal information from the location units and computes the location of the tag. Time-difference-of-Arrival (TDOA), received signal strength indication (RSSI) or other triangulation techniques may be used.
Owner:AEROSCOUT
Channel assignment apparatus and method for a common packet channel in a WCDMA mobile communication system
InactiveUS6859445B1Improve reliabilityReduce complexityPower managementNetwork traffic/resource managementCommunications systemCollision detection
A common packet channel assignment method and device in a CDMA (Code Division Multiple Access) communication system is disclosed. The method comprises transmitting an access preamble signal having channel information which is used to access a base station, and then receiving an; access preamble acquisition indicator signal from the base station in response to the access preamble signal. A collision detection preamble for detecting a collision is transmitted in response to the received access preamble acquisition indicator signal. A first signal indicating acquisition of the collision detection preamble and a second signal indicating channel assignment are received, both of which the base station has transmitted in response to the collision acquisition signal. Upon receipt of the first signal, a common packet channel is assigned according to information designated by the second signal.
Owner:SAMSUNG ELECTRONICS CO LTD
Code synchronization in CDMA satellite wireless communications system using uplink channel detection
ActiveUS20050201449A1Time-division multiplexRadio transmission for post communicationCommunications systemTime shifting
An uplink signal transmitted by a terminal is received by a satellite wireless communications system. The uplink signal includes a known information element, e.g., a reverse access channel (R-ACH) preamble, spread according to a spreading code specific to a component of a satellite wireless communications system, e.g., a pseudonoise (PN) sequence associated with a satellite beam. A correlation of the received uplink signal with the spreading code over a range of time shifts is determined. The known information element is detected from the determined correlation. The satellite wireless communications system is synchronized with the terminal responsive to detection of the known information element. For example, a delay may be assigned to a receiver of the satellite wireless communications system responsive to detection of the known information element.
Owner:MOBILE SATELLITE VENTURES LP
Methods of avoiding multiple detections of random access channel preamble in wireless communication systems
InactiveUS20050271025A1Avoid detectionRadio transmissionWireless communicationCommunications systemRandom-access channel
In a method of avoiding multiple detection of the same random access channel (RACH) preamble in a wireless communication system, and within a given set of access slots, a given sub-set of available preamble signatures corresponding to a RACH preamble of a user may be detected, so as to avoid multiple RACH preamble detection in a given access slot. Another method may be directed to switching operations of a base station in a communication network. Base station operations may be switched back and forth between multi-sector / single cell operations and single sector / multi-cell operations without changing an existing antenna configuration.
Owner:ALCATEL-LUCENT USA INC
Apparatus and method for performing uplink synchronization in wireless communication system
ActiveUS20120300752A1Reduce overheadSynchronisation arrangementNetwork traffic/resource managementCommunications systemMobile station
This specification relates to an apparatus and method for performing random access in a wireless communication system. This specification discloses a mobile station, including a reception unit for receiving TAG configuration information on which at least one serving cell configured in the mobile station is classified as a Timing Alignment Group (TAG) from a base station and a transmission unit for transmitting a random access preamble to the base station on one representative serving cell within the TAG. In accordance with this specification, a procedure of obtaining a TAV for a serving cell in order to secure and maintain uplink timing synchronization becomes clear, the time taken to obtain uplink synchronization for a serving cell may be reduced, and overhead due to excessive random access attempts may be reduced by obtaining a TAV for a plurality of serving cells through one random access procedure.
Owner:APPLE INC
Preamble design for multiple input-multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system
InactiveUS7233625B2Spatial transmit diversityPolarisation/directional diversityMultiplexingMultiple input
One or more preambles are inserted into frames of Orthogonal Frequency Multiplexing (OFDM)-Multiple Input, Multiple Output (MIMO) signals. The preamble is received by the antennas of a receiver, decoded and compared to known values to provide synchronization, framing, channels estimation, offsets and other corrections to the transmitted signal.
Owner:APPLE INC
Method and apparatus for embodying and synchronizing downlink signal in mobile communication system and method for searching cell using the same
InactiveUS20060114812A1Solve the excessive calculationSynchronisation arrangementSignal allocationCell searchCyclic prefix
In an OFDMA-based cellular system, a frame of a downlink signal includes a common slot and traffic slots. The common slot includes a synchronization preamble and a cell search preamble. The synchronization preamble has a structure for synchronizing time and frequency, and the cell search preamble has a cell search structure. The traffic slot includes pilot symbols provided on the time and frequency axes. A cyclic prefix is used to estimate initial symbol synchronization, and the initial symbol synchronization and the synchronization preamble are used to synchronize the frame. The synchronization frame and the cell search preamble are used to estimate time and frequency synchronization. The cell search preamble is used to search cells. When the initial synchronization is performed, the cyclic prefix is used to track the frequency, the synchronization preamble is used to track symbol synchronization, and the cell search preamble is used to track fine frequency synchronization.
Owner:ELECTRONICS & TELECOMM RES INST +1
Enhanced random access procedure for mobile communications
ActiveUS20120147830A1Wider transmission bandwidthIncrease data rateSynchronisation arrangementError preventionUplink transmissionMobile communication systems
The invention relates to a random access procedure for use in a mobile communication system. Furthermore, the invention also provides a mobile terminal and a base station that as suitably adapted to perform the random access procedure as well as the definition of a special format of a random access response message signalled during the random access procedure. To suggest a random access procedure that allows more information to be conveyed in the first scheduled transmission of the random access procedure, the invention proposes a random access procedure for use in a mobile communication system, wherein a base station transmits a random access response in response to receiving a random access preamble from a mobile terminal, wherein the random access response message comprises a grant for a scheduled transmission by the mobile terminal and an indication on the uplink transmission mode for the scheduled transmission.
Owner:PANASONIC CORP
Estimating a writer/reader gap in a disk drive by measuring write/read times relative to a sync mark
ActiveUS7006316B1Record information storageFunctional testing of recording headsComputer sciencePreamble
A method of estimating a writer / reader gap in a disk drive is disclosed. During a first revolution of the disk, a clock is synchronized to a first preamble and used to measure a write delay to write a second sync mark to the disk relative to a first sync mark. During a second revolution of the disk, the clock is again synchronized to the first preamble and used to measure a read delay required to detect the second sync mark relative to the first sync mark. The writer / reader gap is then estimated in response to the measured write delay and the measured read delay, for example, by computing a difference between the measured write delay and the measured read delay.
Owner:WESTERN DIGITAL TECH INC
Disk drive having one or more partial servo wedges that includes a short servo sync mark that is different than the servo sync word of full servo wedges
ActiveUS7046465B1Record information storageAlignment for track following on disksEngineeringData location
A disk drive has a spindle motor, a disk mounted for rotation on the spindle motor, and a head for reading from and writing to the disk. The disk includes a recording surface having a track that includes a first full servo wedge and a second full servo wedge, each of the first full and second full servo wedges defining a leading end and a trailing end and having, between leading and trailing ends, a preamble, a servo sync word, a track ID, and a plurality of servo positioning burst fields. The recording surface further includes user addressable data locations and a first partial servo wedge disposed between the trailing end of the first full servo wedge and the leading end of the second full servo wedge. The first partial servo wedge is devoid of preamble, track ID and wedge ID and includes a short servo sync mark that is different from the servo sync word. The servo sync mark defines a predetermined bit pattern that is immediately followed by a plurality of servo bursts.
Owner:WESTERN DIGITAL TECH INC
Feedback of channel information in a closed loop beamforming wireless communication system
ActiveUS20060291544A1Modulated-carrier systemsWireless network protocolsChannel state informationCommunications system
A method for feeding back transmitter beamforming information from a receiving wireless communication device to a transmitting wireless communication device includes a receiving wireless communication device receiving a preamble sequence from the transmitting wireless device. The receiving wireless device estimates a channel response based upon the preamble sequence and then determines an estimated transmitter beamforming unitary matrix based upon the channel response and a receiver beamforming unitary matrix. The receiving wireless device then decomposes the estimated transmitter beamforming unitary matrix to produce the transmitter beamforming information and then wirelessly sends the transmitter beamforming information to the transmitting wireless device.
Owner:BELL NORTHERN RES LLC
Device communication using a reduced channel bandwidth
Systems and / or methods for supporting communications at a reduced bandwidth with a full bandwidth network such as a long-term evolution (LTE) network may be disclosed. For example, inband assignments such as downlink assignments and / or uplink grants may be provided and / or received and transmissions may be monitored and / or decoded based on the inband assignment. Additionally, information (e.g. a definition or configuration) associated with an ePDCCH may be provided and / or received and ePDCCH resources may be monitored and / or decoded based on such information. An indication for support of a reduced bandwidth by the full bandwidth network may also be provided and / or received and control channels in the reduced or narrow bandwidth may be monitored and / or decoded based on the indication. A PRACH preamble and / or a multi-type sub frame definition may also be provided and / or used for support of such a reduced bandwidth.
Owner:INTERDIGITAL PATENT HLDG INC
Advanced memory device having improved performance, reduced power and increased reliability
An advanced memory having improved performance, reduced power and increased reliability. A memory device includes a memory array, a receiver for receiving a command and associated data, error control coding circuitry for performing error control checking on the received command, and data masking circuitry for preventing the associated data from being written to the memory array in response to the error control coding circuitry detecting an error in the received command. Another memory device includes a programmable preamble. Another memory device includes a fast exit self-refresh mode. Another memory device includes auto refresh function that is controlled by the characteristic device. Another memory device includes an auto refresh function that is controlled by a characteristic of the memory device.
Owner:GLOBALFOUNDRIES US INC
Apparatus and method for advanced communication in low-power wireless applications
InactiveUS20110074552A1Multiplex system selection arrangementsPower managementWirelessReal-time computing
A low power device is presented. In some embodiments, the low power device communicates with other devices utilizing transport channels defined from combinations of a plurality of physical channels. In some embodiments, the low power device communicates with other devices utilizing packets that includes a preamble, a header with a sync and frame info, and a frame. The frame, for example, can be a wake-up frame, a request frame, a response frame, or one or more data frames. In some embodiments, the wake-up frame can include a count-down integer indicating the number of wake-up frames before a request frame is sent. In some embodiments, arbitration may be utilized between devices responding to a request. In some embodiments, specific requests commands can be included in the request frame and corresponding response frames are responsive to the commands.
Owner:SAVI TECH INC
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