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969 results about "Frequency-division multiple access" patented technology
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Frequency division multiple access (FDMA) is a channel access method used in some multiple-access protocols. FDMA allows multiple users to send data through a single communication channel, such as a coaxial cable or microwave beam, by dividing the bandwidth of the channel into separate non-overlapping frequency sub-channels and allocating each sub-channel to a separate user. Users can send data through a subchannel by modulating it on a carrier wave at the subchannel's frequency. It is used in satellite communication systems and telephone trunklines.
Transmission control protocol/internet protocol (TCP/IP) packet-centric wireless point to multi-point (PTMP) transmission system architecture
InactiveUS6862622B2Special service provision for substationError detection/prevention using signal quality detectorTransport systemWorkstation
A packet-centric wireless point to multi-point telecommunications system includes: a wireless base station communicating via a packet-centric protocol to a first data network; one or more host workstations communicating via the packet-centric protocol to the first data network; one or more subscriber customer premise equipment (CPE) stations coupled with the wireless base station over a shared bandwidth via the packet-centric protocol over a wireless medium; and one or more subscriber workstations coupled via the packet-centric protocol to each of the subscriber CPE stations over a second network. The packet-centric protocol can be transmission control protocol / internet protocol (TCP / IP). The packet-centric protocol can be a user datagram protocol / internet protocol (UDP / IP). The system can include a resource allocation means for allocating shared bandwidth among the subscriber CPE stations. The resource allocation is performed to optimize end-user quality of service (QoS). The wireless communication medium can include at least one of: a radio frequency (RF) communications medium; a cable communications medium; and a satellite communications medium. The wireless communication medium can further include a telecommunications access method including at least one of: a time division multiple access (TDMA) access method; a time division multiple access / time division duplex (TDMA / TDD) access method; a code division multiple access (CDMA) access method; and a frequency division multiple access (FDMA) access method.The first data network includes at least one of: a wireline network; a wireless network; a local area network (LAN); and a wide area network (WAN). The second network includes at least one of: a wireline network; a wireless network; a local area network (LAN); and a wide area network (WAN).
Owner:INTELLECTUAL VENTURES I LLC
Time division multiple access downlink personal communications system voice and data debit billing method
InactiveUS6185198B1Increase capacityFunction increaseTime-division multiplexData switching by path configurationCode division multiple accessControl channel
A method and apparatus for full-duplex data communication in or for a wireless communications network, such as a cellular network, PCS network, or mobile satellite network, where a remote feature access control operation utilizes a switch to reserve and route selected voice channels or traffic channels in response to the remote feature access control operation. The method comprising the steps of: configuring a mobile switching center (MSC) to route the selected voice channels to a multi-port protocol converter (MPPC) for transmitting a selected data message on the selected voice channel. Transmitting the selected data message via the multi-port protocol converter on the selected voice channel via a data messaging channel during the remote feature access control operation. Then the selected data message is received at a communicator, which is communicatively linked to a reverse voice and / or digital traffic channel of the wireless network, thereby providing for both forward and reverse messaging on the wireless communications network. An apparatus is disclosed for data communication in or for a wireless communications network for transmitting and receiving both forward and reverse voice, traffic, and control channel messages utilizing the disclosed methodology.
Owner:AERIS COMM
Channel allocation in broadband orthogonal frequency-division multiple-access/space-division multiple-access networks
A network is described. In one embodiment, the network comprises multiple subscriber units to communicate with the base station using an orthogonal frequency-division multiple-access (OFDMA) protocol, and a base station. The base-station includes a memory unit to store broadband spatial signature vectors associated with each subscriber and traffic channel allocation logic. The vectors are a function of frequency. The traffic channel allocation logic allocates OFDMA channels using the broadband spatial signature vectors of the subscribers.
Owner:ADAPTIX +1
OFDMA with adaptive subcarrier-cluster configuration and selective loading
InactiveUS6947748B2Transmission path divisionCriteria allocationCarrier signalFrequency-division multiple access
A method and apparatus for subcarrier selection for systems is described. In one embodiment, the system employs orthogonal frequency division multiple access (OFDMA). In one embodiment, a method for subcarrier selection comprises each of multiple subscribers measuring channel and interference information for subcarriers based on pilot symbols received from a base station, at least one of subscribers selecting a set of candidate subcarriers, providing feedback information on the set of candidate subcarriers to the base station, and the one subscriber receiving an indication of subcarriers of the set of subcarriers selected by the base station for use by the one subscriber.
Owner:ADAPTIX +1
Method Implemented in a User Equipment
In some implementations, a method implemented in a user equipment UE for single carrier frequency division multiple access SC-FDMA within a wireless system includes receiving an assignment of a plurality of uplink scheduling request resources and comprising a plurality of SC-FDMA subcarriers of the wireless system. One of the plurality of uplink scheduling request resources is selected for transmission of scheduling requests. It is determined that a change in uplink scheduling request resource should be made. Upon determining that a change in scheduling request resource should be made, another of the assigned uplink scheduling request resources is selected for transmission of scheduling requests.
Owner:MALIKIE INNOVATIONS LTD
Channel Sounding in Ofdma System
ActiveUS20080095223A1Transmission path divisionSignal allocationTelecommunicationsFrequency-division multiple access
Method and apparatus for determining a downlink channel response in an orthogonal frequency division multiplexing access (OFDMA) system. The method and apparatus uses the uplink quality indication channel for determining the downlink channel response, or uses round trip pilot relay channel sounding. The uplink quality indication channel may comprise modified mini-tiles. The subscriber station using round trip pilot relay channel sounding sends composite transponder pilots after receiving the DL pilots.
Owner:APPLE INC
Method of transmitting sounding reference signal in wireless communication system
ActiveUS20100135273A1Reduce battery consumptionImprove spectral efficiencyError prevention/detection by using return channelTransmission systemsCommunications systemSounding reference signal
A method of transmitting a sounding reference signal includes generating a physical uplink control channel (PUCCH) carrying uplink control information on a subframe, the subframe comprising a plurality of SC-FDMA(single carrier-frequency division multiple access) symbols, wherein the uplink control information is punctured on one SC-FDMA symbol in the subframe, and transmitting simultaneously the uplink control information on the PUCCH and a sounding reference signal on the punctured SC-FDMA symbol. The uplink control information and the sounding reference signal can be simultaneously transmitted without affecting a single carrier characteristic.
Owner:LG ELECTRONICS INC
Time division multiple access over broadband modulation method and apparatus
InactiveUS6891841B2Accurate resolutionBroadband local area networksTime-division optical multiplex systemsTime division multiple accessBurst transmission
A communication system is disclosed for providing dedicated bandwidth to at least one subscriber location for transmitting to a common point of distribution via an HFC network. In an embodiment of the invention, the communication system includes a channel interface module and at least one gateway coupled across the HFC network. The channel interface module is located at the point of distribution and includes a transmitter that transmits a windowing signal via the HFC network. The gateway is located at a subscriber location and includes a processor that encapsulates subscriber data into data cells suitable for burst transmission, receive logic that receives the windowing signal, timing logic that indicates burst transmission times only at programmed time slots within each of repeating transmission windows based on the windowing signal and a predetermined transmission timing offset, and a burst transmitter that burst transmits subscriber data cells in a predetermined upstream frequency channel when indicated by the timing logic.
Owner:INCEPTIA +1
Relay communication method for an OFDMA-based cellular communication system
InactiveUS20060193280A1Expand coverageRemove shaded areasFrequency-division multiplex detailsModulated-carrier systemsCommunications systemTrunking
A relay communication method in an orthogonal frequency division multiple access (OFDMA) communication system including at least one base station for providing a multiple access service to a plurality of mobile stations frame by frame. The relay communication method includes dividing a cell defined by transmission power of the base station into a plurality of sectors on the basis of the base station; dividing the cell into an inner area where a first service is supported and an outer area where a second service is supported, on the basis of the base station; arranging at least one relay station in a second service area of each sector; and allocating a partial resource of the frame for communication between the base station and the mobile station through the relay station.
Owner:SAMSUNG ELECTRONICS CO LTD
Code division multiple access (CDMA) communication system
InactiveUS6885652B1Increase profitPower managementBaseband system detailsModem deviceSystem capacity
A multiple access, spread-spectrum communication system processes a plurality of information signals received by a Radio Carrier Station (RCS) over telecommunication lines for simultaneous transmission over a radio frequency (RF) channel as a code-division-multiplexed (CDM) signal to a group of Subscriber Units (SUs). The RCS receives a call request signal that corresponds to a telecommunication line information signal, and a user identification signal that identifies a user to receive the call. The RCS includes a plurality of Code Division Multiple Access (CDMA) modems, one of which provides a global pilot code signal. The modems provide message code signals synchronized to the global pilot signal. Each modem combines an information signal with a message code signal to provide a CDM processed signal. The RCS includes a system channel controller is coupled to receive a remote call. An RF transmitter is connected to all of the modems to combine the CDM processed signals with the global pilot code signal to generate a CDM signal. The RF transmitter also modulates a carrier signal with the CDM signal and transmits the modulated carrier signal through an RF communication channel to the SUs. Each SU includes a CDMA modem which is also synchronized to the global pilot signal. The CDMA modem despreads the CDM signal and provides a despread information signal to the user. The system includes a closed loop power control system for maintaining a minimum system transmit power level for the RCS and the SUs, and system capacity management for maintaining a maximum number of active SUs for improved system performance.
Owner:INTERDIGITAL TECH CORP
Transmission control protocol/internet protocol (TCP/IP) packet-centric wireless point to multi-point (PtMP) transmission system architecture
InactiveUS20050232193A1Special service provision for substationError detection/prevention using signal quality detectorQuality of serviceCode division multiple access
Owner:INTELLECTUAL VENTURES I LLC
Method and apparatus of transmitting scheduling request in wireless communication system
ActiveUS20100040005A1Guaranteed normal transmissionImprove system performanceError preventionSignal allocationCommunications systemControl channel
A method and an apparatus of transmitting scheduling request (SR) in a wireless communication system are provided. The method includes configuring a physical uplink control channel (PUCCH) for a SR in a subframe, the subframe comprising a plurality of single carrier-frequency division multiple access (SC-FDMA) symbols, wherein one SC-FDMA symbol on the PUCCH is punctured and transmitting the SR on the PUCCH in the subframe.
Owner:LG ELECTRONICS INC
System and method for trasmitting uplink control information in an OFDMA communication system
InactiveUS20060013185A1Efficient fast cell switchingQuick switchFrequency-division multiplexRadio transmissionCommunications systemEngineering
A method for transmitting uplink control information in a communication system using an orthogonal frequency division multiple access (OFDMA) scheme is provided. A mobile station (MS) selects a target anchor base station (BS) with which the MS desires to communicate through a fast feedback channel, and transmits a codeword allocated to the selected target anchor BS to a current anchor BS. Upon receiving the codeword, transmitting to the MS, by the anchor BS, fast feedback channel allocation information for the selected BS corresponding to the received codeword. The MS switches to a new anchor BS corresponding to the fast feedback channel allocation information.
Owner:SAMSUNG ELECTRONICS CO LTD
Method for frequency division duplex communications
InactiveUS6853629B2Improve bandwidth efficiencyQuality improvementSpatial transmit diversityModulated-carrier systemsTelecommunicationsPolarization diversity
The high quality PCS communications are enabled in environments where adjacent PCS service bands operate with out-of-band harmonics that would otherwise interfere with the system's operation. The highly bandwidth-efficient communications method combines a form of time division duplex (TDD), frequency division duplex (FDD), time division multiple access (TDMA), orthogonal frequency division multiplexing (OFDM), spatial diversity, and polarization diversity in various unique combinations. The method provides excellent fade resistance. The method enables changing a user's available bandwidth on demand by assigning additional TDMA slots during the user's session.
Owner:AT&T MOBILITY II LLC
System and method for ranging for a fast handover in a mobile communication system
InactiveUS20050117539A1Reduce latencyData switching by path configurationRadio/inductive link selection arrangementsCommunications systemFrequency-division multiple access
A mobile communication system using an orthogonal frequency division multiplexing (OFDM) / orthogonal frequency division multiple access (OFDMA) scheme. The method for assigning ranging codes in the OFDM / OFDMA communication system includes classifying rangings between a base station and a mobile subscriber station (MSS) of the OFDM / OFDMA communication system into an initial ranging, a periodic ranging, a bandwidth request ranging, and a handover ranging. A first number of ranging codes used for the rangings are created and a second number of ranging codes selected from the first number of ranging codes are assigned as handover ranging codes used for the handover ranging.
Owner:SAMSUNG ELECTRONICS CO LTD
Method Implemented in an eNodeB
ActiveUS20130163536A1Modulated-carrier systemsTransmission path divisionCarrier signalUplink scheduling
In some implementations, a method implemented in an eNodeB (eNB) base station for single carrier frequency division multiple access SC-FDMA within a wireless system includes assigning to a user equipment a plurality of uplink scheduling request resources each comprising a plurality of subcarriers. It is determined that change in scheduling request resource used by the UE should be made. Upon determining that a change in scheduling request resource should be made, a command is transmitted to the UE instructing the UE to transmit scheduling requests on another of the plurality of assigned scheduling request resources.
Owner:MALIKIE INNOVATIONS LTD
Method Implemented in an eNodeB Base Station
In some implementations, a method implemented in an eNodeB base station (eNB) for a single carrier frequency division multiple access SC-FDMA wireless system includes receiving an uplink control channel signal on an assigned scheduling request resource. A user ID is decoded from the received uplink control channel signal. A message assigning a portion of a resource of the wireless system to a UE associated with the decoded user ID is transmitted.
Owner:MALIKIE INNOVATIONS LTD
Data transmission method and device in wireless communication system
ActiveUS20130148592A1Guaranteed normal transmissionError preventionTransmission path divisionCommunications systemSounding reference signal
A data transmission method and device are provided in a wireless communication system. A user equipment transmits uplink control information (UCI) using a physical uplink control channel (PUCCH) resource, allocated to a first component carrier (CC) among a plurality of CC's, in a sounding reference signal (SRS) subframe. The plurality of CC's in said SRS subframe, includes a second CC which comprises a single carrier-frequency division multiple access (SRS SC-FDMA) symbol, which is reserved to transmit SRS.
Owner:LG ELECTRONICS INC
Code division multiple access (CDMA) communication system
InactiveUS20040252668A1Easy to liftMaximize signal to noisePower managementBaseband system detailsSystem capacityCode division multiple access
A subscriber unit for use in a multiple access spread-spectrum communication system includes a spread spectrum radio interface, responsive to a rate function signal from a base station, and first and second despreaders. The base station assigns the rate function spread-spectrum message channels and the first despreader recovers and modifies an information signal one of the spread spectrum message channels. The information channel mode is then modified for processing by the second despreader, with the second despreader supporting a different information signal rate. The subscriber unit has a capability of communicating with a dynamically changing a transmission rate of an information signal which includes multiple spread spectrum message channels. The system includes a closed loop power control system for maintaining a minimum system transmit power level for a radio carrier station and the subscriber units, and system capacity management for maintaining a maximum number of active subscriber units for improved system performance.
Owner:INTERDIGITAL TECH CORP
Method for authenticating a mobile unit attached to a femtocell that operates according to code division multiple access
ActiveUS20090191844A1Unauthorised/fraudulent call preventionDigital data processing detailsCode division multiple accessAuthentication server
The present invention provides a method involving a femtocell in communication with an Internet Protocol Multimedia Subsystem (IMS) network. In one embodiment, the femtocell operates according to code division multiple access (CDMA) standards. The method includes receiving, from the femtocell and at a first secure entity in the IMS network, first authentication information generated by the mobile unit using a first random number broadcast by the femtocell in a global challenge. The method also includes receiving, from a second secure entity in the secure network, at least one security key formed based on the global challenge and second authentication information for uniquely challenging the mobile unit. In one embodiment, the second secure entity is a CDMA-based authentication server. The method further includes providing the security key(s) to the femtocell in response to authenticating the mobile unit based upon the second authentication information.
Owner:ALCATEL LUCENT SAS
Method Implemented in a User Equipment
ActiveUS20130163535A1Error prevention/detection by using return channelSpatial transmit diversityTelecommunicationsFrequency-division multiple access
In some implementations, a method implemented in user equipment UE for use in a wireless system for single carrier frequency division multiple access SC-FDMA includes receiving an assignment of a recurring scheduling request resource from within the wireless system. Information is transmitted on an instance of the assigned recurring scheduling request resource within an SC-FDMA uplink shared channel signal wherein said information comprises a user ID.
Owner:MALIKIE INNOVATIONS LTD
Method and apparatus for multicasting real time traffic in wireless ad-hoc networks
InactiveUS6721290B1Speed up decision making processSpecial service provision for substationNetwork traffic/resource managementQuality of servicePacket loss
A real-time multicast scheduler method and apparatus is presented, to facilitate multicasting of real-time constant bit rate data in wireless ad-hoc networks. Constant bit rate traffic cannot tolerate delay jitter. However, a small amount of packet losses may be tolerable. In order to ensure the provisioning of a desired level of quality of service, bandwidth is reserved on the multicast structure. A goal of the real-time multicast scheduler is to avoid packet collisions and to facilitate color re-use, where "color" is defined as a channel selected as a combination of time-division multiple access, frequency-division multiple access, and code-division multiple access schemes. The real-time multicast scheduler provides a self-healing network which corrects for disconnections caused by node movement and nodes moving out of range of each other, while accounting for colors already assigned for data transmission in order to prevent packet collisions.
Owner:HRL LAB
Synchronous spectrum sharing based on OFDM/OFDMA signaling
InactiveUS8520606B2Spectral gaps assessmentTransmission path divisionFrequency spectrumCommunications system
A system and method for synchronous spectrum sharing for use in a wireless communication system based on orthogonal frequency-division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) signaling is disclosed. The system includes a frame detector configured to detect a frame of a broadcast waveform and extract idle spectrum information for the frame to the secondary user node. The system allows transmitting data from the secondary user node in unused symbol slots identified in the idle spectrum information thereby making efficient use of unused or idle spectrum. Accordingly, secondary users of the wireless communication system can dynamically form ad-hoc mesh network communications in fixed or mobile scenarios.
Owner:SAMSUNG ELECTRONICS CO LTD
Apparatus and method for transmitting of channel quality indicator and acknowledgement signals in sc-fdma communication systems
ActiveUS20090022135A1Robust system operationLoss of operationError prevention/detection by using return channelTransmission systemsMultiplexingCommunications system
A method and apparatus for multiplexing positive or negative acknowledgement signals (ACK or NACK, respectively) and channel quality indication (CQI) signals from a user equipment (UE) to a serving base station (Node B) during a CQI transmission time interval (TTI) in a single-carrier frequency division multiple access (SC-FDMA) communication system. The UE does not have simultaneous data transmission. The multiplexing of acknowledgement signals is implicitly achieved by the UE applying different orthogonal covers on the reference signal (RS) symbols transmitted in the CQI TTI, depending on whether the UE sends ACK or NACK. At the Node B receiver, the detection of ACK or NACK is based on the accumulated RS energy, after removing each of the possible orthogonal covers applied at the UE transmitter. For robust system performance, absence of ACK / NACK and NACK are mapped onto the same orthogonal cover.
Owner:SAMSUNG ELECTRONICS CO LTD
Method of transmitting sounding reference signal in wireless communication system
ActiveCN101617489AReduce consumptionReduce scheduling overheadOrthogonal multiplexCommunications systemSounding reference signal
A method of transmitting a sounding reference signal includes generating a physical uplink control channel (PUCCH) carrying uplink control information on a subframe, the subframe comprising a plurality of SC-FDMA(single carrier-frequency division multiple access) symbols, wherein the uplink control information is punctured on one SC-FDMA symbol in the subframe, and transmitting simultaneously the uplink control information on the PUCCH and a sounding reference signal on the punctured SC-FDMA symbol. The uplink control information and the sounding reference signal can be simultaneously transmitted without affecting a single carrier characteristic.
Owner:LG ELECTRONICS INC
Method Implemented in an eNodeB Base Station
In some implementations, a method implemented in an eNodeB base station (eNB) for a single carrier frequency division multiple access SC-FDMA within a wireless system includes receiving information within an SC-FDMA uplink shared channel signal on a recurring scheduling request resource. The received information comprises a user ID. A message granting at least a portion of an SC-FDMA resource is transmitted to a UE associated with the user ID.
Owner:MALIKIE INNOVATIONS LTD
Method and apparatus for canceling neighbor cell interference signals in an orthogonal frequency division multiple access system
InactiveUS20070149242A1Improve reception performanceGood switching effectModulated-carrier systemsRadio transmissionEngineeringFrequency-division multiple access
A method and apparatus are provided where a neighbor cell interference signal is canceled upon receiving a signal transmitted from a serving base station (BS) in a receiver of an Orthogonal Frequency Division Multiple Access (OFDMA) system. The interference signals are detected from signals received from neighbor BSs and a serving BS. The strength of the detected interference signals is measures, and a determination is made whether the measured strength is higher than a threshold value. A list of neighbor BSs satisfying the determination result is reordered, and interference signals in order of the reordered neighbor BSs are selected and detected. An interference / noise variance for the detected interference signal is calculated and normalized. The normalized interference signal is decoded and regenerated, and the regenerated interference signal is subtracted from the received signal.
Owner:SAMSUNG ELECTRONICS CO LTD
Apparatus and method for reduced peak-to-average-power ratio in a wireless network
InactiveUS20070081604A1Modulated-carrier systemsPolarisation/directional diversityTelecommunicationsFrequency spectrum
A wireless transmission device capable of communicating with a receiver according to a DFT-spread OFDM protocol. The wireless transmission device comprises a configurable spectral shaping filter block capable of performing spectral shaping of an outgoing signal. The wireless transmission device configures the configurable spectral shaping filter block to perform spectral shaping according to a peak-to-average power (PAPR) value associated with the outgoing signal. The multi-carrier protocol comprises one of orthogonal frequency division multiple access (OFDMA) and orthogonal frequency division multiplexing (OFDM).
Owner:SAMSUNG ELECTRONICS CO LTD
Method and apparatus for performing space division multiple access in a wireless communication network
A method and apparatus for performing space division multiple access in wireless communications are disclosed. After the receipt of a set of training data from a base station, an estimated channel state information (CSI) is then generated by a mobile station. The CSI is subsequently quantized. The mobile station then determines whether or not the quantized CSI falls within a set of thresholds. If the quantized CSI falls within the set of thresholds, the mobile then sends feedback information to the base station to allow the base station to consider the mobile station as one of the mobile station candidates available for data communications. Otherwise, if the quantized CSI falls outside the set of thresholds, the mobile station then discards the quantized CSI.
Owner:BOARD OF RGT THE UNIV OF TEXAS SYST
Position detection and/or movement tracking via image capture and processing
InactiveUS20080316324A1Television system detailsCharacter and pattern recognitionCode division multiple accessPerformed Imaging
Position detection and / or movement tracking via image capture and processing. Digital cameras perform image capture of one or more objects within a particular region (e.g., a physical gaming environment). A game module or processing module processes the images captured by the digital cameras to identify a position of and / or track movement of objects (e.g., a player, a gaming object, a game controller, etc.). Various digital image processing techniques may be employed including pattern recognition of objects, color recognition / distinction, intensity recognition / distinction, relative size comparison, etc. to identify objects and / or track their movement. The coupling between the digital cameras and the game module or processing module may be wired, wireless, or a combination thereof. If wireless, any number of different signaling means may be employed including Code Division Multiple Access (CDMA) signaling, Time Division Multiple Access (TDMA) signaling, or Frequency Division Multiple Access (FDMA) signaling.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE
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