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252results about "Code shifting or hopping" patented technology
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Method and apparatus of transmitting information in wireless communication system
InactiveUS20110126071A1Efficiently transmitting informationImprove system performanceError prevention/detection by using return channelSignal allocationCommunications system
A method and an apparatus of transmitting information in a wireless communication system are provided. The method includes transmitting first information based on a first resource index through a first antenna and transmitting second information based on a second resource index through a second antenna.
Owner:LG ELECTRONICS INC
Method of transmitting control signal in wireless communication system
ActiveUS20090290538A1Guaranteed normal transmissionImprove system performanceError prevention/detection by using return channelFrequency-division multiplex detailsCommunications systemResource block
A method of transmitting a control signal in a wireless communication system is provided. The method includes acquiring a resource index, the number of cyclic shifts (CSs) and a CS interval, wherein the number of CSs is an integer multiple of the CS interval, determining a CS index based on the number of CSs and the CS interval, generating a cyclically shifted sequence by cyclically shifting a base sequence by a CS amount obtained from the CS index, generating a modulated sequence based on the cyclically shifted sequence and a symbol for a control signal and transmitting the modulated sequence after mapping the modulated sequence to a resource block obtained from the resource index.
Owner:LG ELECTRONICS INC
Multi-dimensional orthogonal resource hopping multiplexing communications method and apparatus
InactiveUS7149199B2Reduce the cushioning forceIncrease the number ofPower managementTime-division multiplexPower controllerMultiplexing
Owner:KOREA ADVANCED INST OF SCI & TECH +1
Method and apparatus for spreading sequence hopping in code-multiplexed control channels
ActiveUS20060056360A1Reduce impactMultiplex code generationRadio transmissionMultiplexingControl signal
A method and apparatus for code multiplexing one or more control signals onto a shared control channel. According to the present invention, a control signal for transmission from a base station to a mobile station terminal is repeated in each slot of a predetermined time interval. The control signal in each slot is spread using a bit-level spreading sequence, where the bit-level spreading sequence varies from slot to slot according to a predefined sequence-hopping pattern. The spread control signals generated for transmission to each mobile station terminal are then combined and spread using a common channelization code.
Owner:LENOVO INNOVATIONS LTD HONG KONG
Base station, mobile station, radio communication system, and communication control method
InactiveUS20100067464A1Reduce impactNetwork traffic/resource managementTransmission path divisionCommunications systemMobile station
One of sequence groups each specifying reference signal sequences for respective radio resource bandwidths is assigned to a base station and a different one of the sequence groups is assigned to a neighboring cell. The base station includes a scheduler configured to allocate radio resources; a reporting unit configured to report the allocated radio resources and a cyclic shift amount to a mobile station; and a demodulating unit configured to demodulate a signal received from the mobile station based on one of the reference signal sequences corresponding to one of the radio resource bandwidths and the cyclic shift amount. Cell reuse is applied to the reference signal sequences to be transmitted using one resource unit, and sequence hopping where different ones of the reference signal sequences are assigned to consecutive subframes is applied to the reference signal sequences to be transmitted using a bandwidth greater than one resource unit.
Owner:NTT DOCOMO INC
Systems and methods for sparse code multiple access
InactiveCN104798317AModulated-carrier systemsDiversity/multi-antenna systemsSymbol mappingMulti dimensional
Coding gains can be achieved by encoding binary data directly to multi-dimensional codewords, which circumvents QAM symbol mapping employed by conventional CDMA encoding techniques. Further, multiple access can be achieved by assigning different codebooks to different multiplexed layers. Moreover, sparse codewords can be used to reduce baseband processing complexity on the receiver-side of the network, as sparse codewords can be detected within multiplexed codewords in accordance with message passing algorithms (MPAs).
Owner:HUAWEI TECH CO LTD
Apparatus and method for transmitting/receiving pilot code pattern for identification of base station in communication system using orthogonal frequency division multiplexing scheme
ActiveUS20050226141A1Maximizing numberMultiplex code allocationMulti-frequency code systemsCommunications systemComputer science
Provided are an apparatus and method for transmitting / receiving a pilot code pattern used to identify a base station. In the base station, a pilot code pattern determiner determines a code set that includes a number of spreading codes based on a specific ID of the base station. A first spreader spreads a pilot symbol mapped onto an FC with a corresponding spreading code according to the determined code set, and controls gain so as to transmit the pilot symbol at a higher signal level than data. A second spreader spreads data symbols mapped onto the FC with spreading codes of the code set except for the spreading code used for the pilot spreading. A mapper groups a spread signal from the first spreader and spread signals from the second spreader on a TFC basis, and outputs signals that constitute each TFC to points of sub-carriers. An IFFT unit performs an IFFT operation on signals output from the mapper. Because the pilot as well as the data is spread, it is easy to implement the base station. Also, it is possible to identify base stations according to the pilot spreading codes as well as a pilot hopping pattern.
Owner:SAMSUNG ELECTRONICS CO LTD
Base station apparatus, user apparatus and method used in mobile communication system
ActiveUS20100034077A1Precise arrangementTransmission path divisionCriteria allocationEngineeringMobile communication systems
A base station apparatus is used in a mobile communication system that uses an OFDM scheme in a downlink. The base station apparatus includes: a unit configured to perform inverse Fourier transform on a signal in which a first signal and a second signal is mapped to subcarriers with different transmission power density, and to generate a transmission signal; and a transmission unit configured to transmit the transmission signal to a user apparatus. A subcarrier (prohibited subcarrier) in which mapping of the second signal is prohibited is determined such that transmission power density of the second signal is kept constant among a plurality of OFDM symbols regardless of whether the first signal is included in an OFDM symbol including the second signal. The prohibited subcarrier is determined based on a subcarrier to which the first signal is mapped.
Owner:NTT DOCOMO INC
Method and apparatus for generating a reference signal sequence in a wireless communication system
ActiveUS20130121266A1Guaranteed OrthogonalityModulated-carrier systemsNetwork traffic/resource managementCommunications systemUser equipment
The present invention provides a method and apparatus for generating a reference signal sequence by user equipment (UE) in a wireless communication system. The UE receives a UE-specific sequence group hopping (SGH) parameter that is specific to itself, and generates a reference signal sequence based on a base sequence in each slot unit. The base sequence is classified into sequence-group numbers determined in each of the slot units by the UE-specific SGH parameter indicating whether SGH has been carried out, and base sequence numbers.
Owner:LG ELECTRONICS INC
Tag communications with access point
ActiveUS7526013B1Easy accessProvide securityReceiver initialisationError prevention/detection by using return channelData streamCheque
A method of establishing communication at a tag includes calculating a metric for each of a plurality of automatic frequency control (AFC) hypotheses where the plurality of AFC hypotheses correspond to a timing used by an access point; based on the calculated metrics, identifying one or more relevant AFC hypotheses; performing a check on a demodulated data stream identified using the one or more relevant AFC hypotheses; identifying a valid AFC hypothesis based at least in part on the check; and determining where a frame starts based at least in part on the check.
Owner:INGENU INC
Novel signature sequences and methods for time-frequency selective channel
ActiveUS20080170608A1Synchronisation arrangementMultiplex code generationWireless transmissionTransceiver
A signature sequence employed in a wireless transmission over a channel is detected and utilized. The signature sequence is selected from a set of sequences formed by delay-Doppler shifts of a base sequence. Preferably but not exclusively, the set of sequences is formed by circular delay-Doppler shifts of the base sequence. The base sequence can be, for example, an m-sequence. A received signal is obtained from a received wireless transmission. A candidate sequence selector (90) selects a candidate sequence from among a set of sequences for evaluation as the signature sequence, the set of sequences having been formed by sequence set generator (88) as delay-Doppler shifts of a base sequence. An image former (82) uses the base sequence and the received signal to form a delay-Doppler image with respect to an image area pertinent to the candidate sequence. A metric analyzer (84) computes a metric over the image area pertinent to the candidate sequence and uses the metric to determine if the signature sequence is the candidate sequence. A sequence utilization device (76) can use the signature sequence to identify another transceiver unit which sent the wireless transmission, and / or use the signature sequence for synchronization with another transceiver unit which sent the wireless transmission.
Owner:TELEFON AB LM ERICSSON (PUBL)
Application of sequence hopping and orthogonal covering codes to uplink reference signals
ActiveUS20110206089A1Error preventionFrequency-division multiplex detailsCommunications systemControl channel
Methods and apparatuses are provided to enable User Equipments (UEs) to apply Orthogonal Covering Codes (OCC) to the transmission of Reference Signals (RS) generated from Constant Amplitude Zero Auto-Correlation (CAZAC) sequences, to enable hopping of these sequences in a communication system in conjunction with enabling the application of OCC, and to differentiate the application of sequence hopping between transmissions in data channels and transmissions in control channels.
Owner:SAMSUNG ELECTRONICS CO LTD
Method for setting cyclic shift considering frequency offset
ActiveUS20080168114A1Prevent sequenceDeteriorate whole sequenceDigital data processing detailsSecret communicationDelay spreadPropagation delay
A method for establishing a cyclic shift sequence to provide against the frequency offset is disclosed. The method calculates a distance between a channel response position of the sequence and an alias channel response position caused by a frequency offset, calculates the number of cyclic shifts per group according to the calculated distance, and establishes the cyclic shift (CS)-applying interval. This method easily establishes a cyclic shift (CS) interval at a specific location having no overlapping by considering a channel response of a reception (Rx) sequence and an alias location of this reception (Rx) sequence, although a reception (Rx) signal is shifted by a channel delay spreading or a propagation delay irrespective of categories of a domain generating a sequence, so that it can greatly reduce the number of the detection errors and the false alarm rate. And, if a sequence of the cyclic shift (CS) is allocated to a cell having a frequency offset of more than a predetermined level, the present invention can minimize the influence of a frequency offset on a high-mobility cell.
Owner:LG ELECTRONICS INC
Apparatus and method for transmission of sounding reference signal in uplink wireless communication systems with multiple antennas and sounding reference signal hopping
ActiveUS20090316756A1Solve the real problemModulated-carrier systemsPolarisation/directional diversityCommunications systemSounding reference signal
A sounding reference signal transmission method which is efficient in an uplink wireless telecommunications system using a multiple antenna technique and sounding reference signal hopping. A terminal using the multiple antenna technique is equipped with a plurality of antennas, and a base station receives the sounding reference signal transmitted from these antennas and estimates the uplink channel state of each antenna. Moreover, the sounding reference signal performs frequency hopping so that the base station determines the channel condition for the entire bandwidth to which data is transmitted in the uplink system. The sounding reference signal is transmitted through an antenna pattern in which the sounding reference signal can be transmitted through the entire data transmission bandwidth of the uplink system for each antenna of the terminal without additional overhead in this environment.
Owner:SAMSUNG ELECTRONICS CO LTD
Method and apparatus for generating a reference signal sequence in a wireless communication system
ActiveUS20130201931A1Guaranteed OrthogonalityNetwork traffic/resource managementModulated-carrier systemsCell specificCommunications system
The present invention relates to a method and apparatus for generating a reference signal sequence in a wireless communication system. User equipment receives a cell-specific sequence hopping parameter from a base station, receives, from the base station, a user equipment (UE)-specific sequence group hopping (SGH) parameter which is specific to said user equipment, and generates a reference signal sequence on the basis of a base sequence number of a base sequence, wherein the base sequence number is determined for each slot on the basis of the cell-specific sequence hopping parameter and of the use equipment-specific sequence group hopping parameter. Here, the determination of whether or not to apply sequence hopping to the base sequence number indicated by the user equipment-specific sequence group hopping parameter overrides that of whether or not to apply sequence hopping to the base sequence number indicated by the cell-specific sequence hopping parameter.
Owner:LG ELECTRONICS INC
Method, apparatus and system for configuring demodulation reference signal
ActiveUS20130022087A1Reduce complexityReduce operating loadModulated-carrier systemsPilot signal allocationEngineeringDemodulation
A method, an apparatus and a system for configuring a Demodulation Reference Signal (DMRS) are disclosed in the present invention. The method includes: receiving a DMRS indication index transmitted from a network side; determining at least one port used for the local transmission of the DMRS; acquiring the predetermined DMRS configuration parameters corresponding to the DMRS indication index and the at least one port, and configuring, according to the DMRS configuration parameters, the DMRS to be transmitted from the at least one port. Therefore, the terminal can implement the configuration of the DMRS without reloading the corresponding configuration information. Thus, the implementation complexity of the DMRS configuration flow is decreased, and the operation load of the terminal is also reduced.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Communication method and apparatus in which first and second control channels operate as an initial acquisition channel and a broadcast channel, respectively
In a base station of a wireless telephone system, the control channel is set efficiently. A channel group for control information communication is provided as a channel to transmit from a base station in addition to the channel for information communication TCE with the terminal device. Among the channel group for control information communication, the frequency channel where the initial acquisition channel ICH exists is fixed to a predetermined frequency channel, and the time slot in which the initial acquisition information is transmitted is set by a predetermined random number sequence among the frequency channels assigned to the initial acquisition channel ICH to store the set random number information in the initial acquisition information to be transmitted. Then, the time slot in which the initial acquisition channel is transmitted is determined based on the random number obtained by receiving the frequency channel where the initial acquisition channel ICH exists at the terminal device.
Owner:SONY CORP
Radio communication base station device, radio communication terminal device, and response signal allocation method
ActiveUS20100232378A1Easy to useError preventionTransmission path divisionDistribution methodTerminal equipment
It is possible to provide a radio communication base station device, a radio communication terminal device, and a response signal allocation method which perform D-ACK and P-ACK resource allocation while maintaining a high use efficiency of the upstream line control channel of PUCCH or the like. When a plurality of CCE are allocated upon PDCCH transmission, PUCCH resources corresponding to odd CCE numbers are allocated for D-ACK and PUCCH resources corresponding to even CCE numbers are allocated for P-ACK among a plurality of CCE numbers which can be used.
Owner:PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
Method and apparatus for transmitting uplink signal, and method and apparatus for generating uplink signal in communication system
ActiveUS20100067613A1Error preventionModulated-carrier systemsComputer hardwareCommunications system
When a terminal generates an uplink signal in a communication system, the terminal hops a sequence for differentiating itself from another terminal with time. The terminal generates the uplink signal by multiplying a transmission symbol by a sequence of a transmission time corresponding to the transmission symbol.
Owner:ELECTRONICS & TELECOMM RES INST
Reference signal transmitting method and device in a multi-antenna system
ActiveUS20120087427A1Improve system performanceRobust channel estimationSecret communicationRadio transmissionControl channelOrthogonal frequency code division multiplexing
Provided are a reference signal transmitting method and device in a multi-antenna system. A terminal generates a plurality of reference signal sequences to which different cyclic shift values are allocated, respectively, generates an orthogonal frequency division multiplexing (OFDM) symbol to which the plurality of reference signal sequences are mapped, and transmits the OFDM symbol to a base station through a plurality of antennas. Each cyclic shift value allocated to each reference signal sequence is determined on the basis of a parameter n indicated by a cyclic shift field transmitted from a physical downlink control channel (PDCCH).
Owner:LG ELECTRONICS INC
Method and device for transmitting uplink control information in wireless communication system
ActiveUS20120320951A1Efficient methodSignal allocationPhase-modulated carrier systemsCommunications systemOrthogonal sequence
Disclosed are a method and a device for transmitting uplink control information (UCI) by a terminal in a wireless communication system. The UCI transmission method comprises the steps of: generating an encoding information bit stream by performing channel coding for a UCI bit stream; generating complex modulation symbols by performing modulation for the generated encoding information bit stream; spreading the complex modulation symbols in block-wise on the basis of an orthogonal sequence; and transmitting the spread complex modulation symbols to a base station. The encoding information bit stream is generated by a channel coding for circularly repeating the UCI bit stream.
Owner:LG ELECTRONICS INC
Apparatus and Method for Single User Multiple Input Multiple Output Communication Employing Cyclic Shifts
Apparatus and method for communication are provided. The apparatus includes one or more antenna ports; and a processor configured to share a cyclic shift space of reference signals of user equipment utilizing single user multiple input multiple output transmission by applying a cyclic shift increment value between reference signals of different antenna ports or spatial layers of the user equipment transmission.
Owner:NOKIA TECHNOLOGLES OY
Method and apparatus for allocating frequency resources in a wireless communication system supporting frequency division multiplexing
InactiveUS20080008206A1Avoid collisionMaintain continuityError preventionModulated-carrier systemsCommunications systemFrequency-division multiplexing
A method for allocating frequency resources to be used for multiple terminals in a Frequency Division Multiplexing (FDM) wireless communication system in which a base station communicates with the multiple terminals in a predetermined service frequency band. The method includes performing at a first transmission time a process of hierarchizing a series of resource units constituting the service frequency band in a plurality of levels, and hierarchically dividing the series of resource units into blocks including at least one consecutive resource unit in each of the levels, and allocating some of the hierarchically divided blocks as frequency resources for each of the terminals; and performing, at a second transmission time following the first transmission time, a process of hierarchically hopping the blocks allocated as the frequency resources for each of the terminals so that the blocks each have a different frequency band from a frequency band used at the first transmission time, and allocating the hopped blocks as frequency resources for each of the terminals.
Owner:SAMSUNG ELECTRONICS CO LTD
Maintaining a constant transmission power density of a data signal utilizing prohibited subcarriers
ActiveUS8059611B2Precise arrangementTransmission path divisionCriteria allocationData signalEngineering
A base station apparatus is used in a mobile communication system that uses an OFDM scheme in a downlink. The base station apparatus includes: a unit configured to perform inverse Fourier transform on a signal in which a first signal and a second signal is mapped to subcarriers with different transmission power density, and to generate a transmission signal; and a transmission unit configured to transmit the transmission signal to a user apparatus. A subcarrier (prohibited subcarrier) in which mapping of the second signal is prohibited is determined such that transmission power density of the second signal is kept constant among a plurality of OFDM symbols regardless of whether the first signal is included in an OFDM symbol including the second signal. The prohibited subcarrier is determined based on a subcarrier to which the first signal is mapped.
Owner:NTT DOCOMO INC
Wireless Terminal Apparatus and Wireless Base Station Apparatus
ActiveUS20090303929A1Increase the number ofConnection managementMultiplex code allocationPhase shiftedControl signal
Both a wireless terminal apparatus and wireless base station apparatus are provided that can, in an operation of encoding the control signals of the upstream link transmitted from the multiple terminal stations while encoding with regard to each of the terminal stations, increase a number of the terminal stations to which different codes are respectively assigned. A wireless terminal apparatus includes: an encoding information receiving portion receiving encoding information which is used at the wireless terminal apparatus from the base station; a phase-shifting unit which conducts a phase-shifting operation on a predetermined first code based on the encoding information; a code selection unit which, based on the received encoding information, selects a second code from multiple codes orthogonally crossing each other; and a control signal encoding portion which conducts an encoding operation on the control signal that is going to be transmitted to the base station by using both the first code on which the phase-shifting operation has been conducted and the second code.
Owner:TOYOTA JIDOSHA KK
Method for interference randomization of physical uplink control channel
ActiveUS20110032926A1Easy to implementImprove performanceTransmission path divisionCriteria allocationTelecommunicationsControl channel
A method for interference randomization of physical uplink control channel (PUCCH), which is used in long term evolution (LTE) system, when multiple terminals multiplex PUCCH to transmit uplink control signallings, the difference of index of control channel resource used by any two terminals in the first timeslot of PUCCH is different from the difference of index of control channel resource used by the two terminals in the second timeslot of PUCCH. The invention can realize interference randomization between UEs that multiplex the same PUCCH.
Owner:ZTE CORP
Method of transmitting control signal in wireless communication system
ActiveUS8259602B2Guaranteed normal transmissionImprove system performanceError prevention/detection by using return channelFrequency-division multiplex detailsCommunications systemControl signal
Owner:LG ELECTRONICS INC
Use of chip repetition to produce a flexible bandwidth DS-CDMA system
InactiveUS7103026B2Attenuation bandwidthReduce capacityAntenna supports/mountingsTime-division multiplexComputer hardwareCommunications system
A method is disclosed for obtaining a spreading code set for a code division multiple access (CDMA) communications system. The method includes (a) generating a P′×P′ spreading code set where P′=P / N, where P is the spreading gain in chips / symbol and where N is an integer multiple of 2; and (b) replicating chips in each spreading code by N to produce a P′×P spreading code set. The step of generating may include randomizing the spreading code set by performing at least one or row or column permutation. The P′×P spreading code set is subsequently loaded into system hardware for operating the system hardware with a bandwidth that is less than the bandwidth that would be required to operate with the P′×P′ Hadamard spreading code set. The CDMA system may be a synchronous, direct sequence code division multiple access communications system.
Owner:L 3 COMM CORP
Method for setting cyclic shift considering frequency offset
ActiveUS20110013715A1Prevent sequenceDeteriorate whole sequenceSynchronisation arrangementModulated-carrier systemsDelay spreadPropagation delay
A method for establishing a cyclic shift sequence to provide against the frequency offset is disclosed. The method calculates a distance between a channel response position of the sequence and an alias channel response position caused by a frequency offset, calculates the number of cyclic shifts per group according to the calculated distance, and establishes the cyclic shift (CS)-applying interval. This method easily establishes a cyclic shift (CS) interval at a specific location having no overlapping by considering a channel response of a reception (Rx) sequence and an alias location of this reception (Rx) sequence, although a reception (Rx) signal is shifted by a channel delay spreading or a propagation delay irrespective of categories of a domain generating a sequence, so that it can greatly reduce the number of the detection errors and the false alarm rate. And, if a sequence of the cyclic shift (CS) is allocated to a cell having a frequency offset of more than a predetermined level, the present invention can minimize the influence of a frequency offset on a high-mobility cell.
Owner:LG ELECTRONICS INC
Method and apparatus for configuring dm-rs for v2x
ActiveUS20170094657A1Modulated-carrier systemsParticular environment based servicesComputer scienceSubframe
A method includes generating a first DM-RS for V2X communication and a second DM-RS for V2X communication, the first DM-RS for V2X communication being mapped in a first symbol in a first slot of a subframe, the second DM-RS for V2X communication being mapped in a second symbol in the first slot; generating a third DM-RS for V2X communication and a fourth DM-RS for V2X communication, the third DM-RS for V2X communication being mapped in a first symbol in a second slot of the subframe, the fourth DM-RS for V2X communication being mapped in a second symbol in the second slot; and transmitting the first DM-RS for V2X communication, the second DM-RS for V2X communication, the third DM-RS for V2X communication, and the fourth DM-RS for V2X communication. The first DM-RS is generated based on a first group-hopping, and the second DM-RS is generated based on a second group-hopping.
Owner:INNOVATIVE TECH LAB CO LTD
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