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2242results about How to "Improve spectral efficiency" patented technology
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Multiple-input, multiple-output (MIMO) systems with multiple transmission modes
InactiveUS6862271B2Improve spectral efficiencyReduce noisePower managementSpatial transmit diversityChannel state informationCommunications system
Techniques to transmit data on a number of transmission channels in a multi-channel communication system using multiple transmission schemes requiring less channel-state information (CSI). These schemes may include a partial-CSI transmission scheme that transmits a single data stream on each transmit antenna selected for use and a “beam-forming” transmission scheme that allocates all transmit power to a single transmission channel having the best performance. Each transmission scheme may provide good or near-optimum performance for a specific range of operating conditions (or operating SNRs). These multiple transmission schemes may then be combined in a piece-wise fashion to form a “multi-mode” transmission scheme that covers the full range of operating conditions supported by the MIMO system. The specific transmission scheme to be used for data transmission at any given moment would then be dependent on the specific operating condition experienced by the system at that moment.
Owner:QUALCOMM INC
Optical fiber-based distributed radio frequency (RF) antenna systems supporting multiple-input, multiple-output (MIMO) configurations, and related components and methods
InactiveUS20140126914A1Improve communication performanceFacilitate data communicationSpatial transmit diversityRadio-over-fibreDistributed antenna systemFrequency conversion
Optical fiber-based distributed antenna systems that support multiple-input, multiple-output (MIMO) antenna configurations and communications. Embodiments disclosed herein include optical fiber-based distributed antenna system that can be flexibly configured to support or not support MIMO communications configurations. In one embodiment, first and second MIMO communication paths are shared on the same optical fiber using frequency conversion to avoid interference issues, wherein the second communication path is provide to a remote extension unit to remote antenna unit. In another embodiment, the optical fiber-based distributed antenna systems may be configured to allow to provide MIMO communication configurations with existing components. Existing capacity of system components are employed to create second communication paths for MIMO configurations, thereby reducing overall capacity, but allowing avoidance of frequency conversion components and remote extension units.
Owner:CORNING OPTICAL COMM LLC
Space-time coding and channel estimation scheme, arrangement and method
InactiveUS6891897B1Improve spectral efficiencyIncreased improved bandwidth efficiencySpatial transmit diversityChannel estimationHigh rateFrequency spectrum
The evolution of high rate data services within future wireless networks will call for new RF access technologies to enable substantial increases in overall system spectral efficiency at an acceptably low cost to the user. Space-Time Coding (STC) is an antenna array processing technology currently simulating considerable Interest across the wireless industry. The invention provides a space-time coding apparatus having an input, a trellis encoder, a modulator, a demultiplexer, and a set of signal outputs wherein the input is operable to receive a stream of data. This allows de-multiplexing to take place after coding and modulation has been performed. The trellis encoder comprises a convolutional encoder operable to sequentially group data to provide coded bits to provide QPSK symbols. By the selection of convolutional encoder rates and / or modulation alphabets STCs of any desired dimensionality may be produced including multi-dimensional codes.
Owner:APPLE INC
Multi-user multicarrier allocation in a communication system
InactiveUS20050111406A1Improve spectral efficiencyImprove throughputCriteria allocationFrequency-division multiplexCommunications systemCarrier signal
In a multicarrier modulation communication system, subcarriers are allocated to a plurality of users using a plurality of sets of sequential subcarriers. The plurality of sets of sequential subcarriers may be allocated for transmitting information to the plurality of users or for transmitting information from the plurality of users. A multicarrier modulation communication system and the multicarrier modulation communications device is also discussed.
Owner:NOKIA CORP
Downlink and uplink channel structures for downlink shared channel system
InactiveUS7006464B1Improve spectral efficiencyAdapt quicklyPower managementTransmission control/equalisingCode spaceTransmitted power
An uplink and downlink channel structure supports a shared downlink data channel. The new structure accommodates advanced physical and Medium Access Control (MAC) layer techniques, such as incremental redundancy (IR), fast adaptation to channel conditions, and multiple input multiple output (MIMO) antenna configuration. The proposed changes are intended to lead to a downlink structure that achieves higher spectral efficiency for the packet oriented services over then shared downlink channel. Additionally, the new structure uses the base station transmit power information and of the channelization (OVSF) code space more efficiently.
Owner:LUCENT TECH INC +1
Base station equipment and a method for steering an antenna beam
InactiveUS6091788AImprove spectral efficiencyReduce distractionsSpatial transmit diversityModulated-carrier systemsFrequency spectrumSpectral efficiency
PCT No. PCT / FI96 / 00287 Sec. 371 Date Nov. 14, 1997 Sec. 102(e) Date Nov. 14, 1997 PCT Filed May 23, 1996 PCT Pub. No. WO96 / 37973 PCT Pub. Date Nov. 28, 1996A method for steering an antenna beam and base station equipment including at least one antenna array having a plurality of elements and at least one channel unit having a means for phasing a signal to be transmitted and received by the antenna array such that gain from the antenna array is the greatest in the desired direction. In order to improve the spectral efficiency of the system, the channel unit includes a means for searching for the incoming directions and delays of the received signal components and a means for controlling the phasing means of the opposite transmission direction based on the information.
Owner:CELLULAR COMM EQUIP LLC
Licensed/unlicensed frequency management in a wireless wide-area network
InactiveUS20070026868A1Facilitate cognitionImprove spectral efficiencyRadio/inductive link selection arrangementsAutomatic exchangesLow noiseComputer science
A system and method for managing licensed and unlicensed frequency bands in a wireless wide-area network includes establishing the available channels of a licensed band and unlicensed band of frequencies. Data traffic is prioritized for assigning channels. Higher priority data traffic is assigned to the licensed frequency band and lower priority data traffic is assigned to the unlicensed frequency band. Channel quality is determined, wherein higher priority traffic is assigned to lower noise channels. Data traffic is shifted from the channels of the unlicensed frequency band to the channels of the licensed frequency band if the quality of the channels of the unlicensed frequency band deteriorates below a predetermined acceptable threshold.
Owner:MOTOROLA INC
Scheduling in a Wireless Multi-Hop Relay Network
ActiveUS20080274692A1Optimize schedulingIncrease overall end-to-end （ETE） channel capacityPower managementTransmission path divisionMulti hop relayTelecommunications
A wireless relaying network having a number of network nodes including a designated originating node, at least one relaying node, and at least two receiving nodes. The designated originating node transmits a pilot signal, and the relaying node(s) receives and forwards the pilot signal to the receiving nodes, each of which measures channel quality based on the received pilot signal. At least part of the receiving nodes feed information on the measured channel quality all the way back to the designated originating node, and the originating node then schedules data for transmission to at least one selected node of the receiving nodes based on the received channel quality information. Subsequently, the designated originating node transmits data to the selected receiving node(s) via the same relaying node(s) that forwarded the pilot signal. In this way, multi-user diversity scheduling is introduced to relaying networks that provides significant data rate enhancements.
Owner:TELEFON AB LM ERICSSON (PUBL)
System and Method for Multi-Level Beamformed Non-Orthogonal Multiple Access Communications
ActiveUS20160353424A1Facilitates the co-scheduling of multiple UEsImprove spectral efficiencySpatial transmit diversityWireless communicationEngineeringBroadband
Owner:FUTUREWEI TECH INC
Method and apparatus for transmitting data in rrc deactivated or activated state
ActiveUS20200037345A1Accurately knowAvoid retransmissionSynchronisation arrangementConnection managementCommunications systemData transmission
The present disclosure relates to a communication technique for combining a 5G communication system for supporting a higher data transmission rate than a 4G system with an IoT technology, and a system therefor. The present disclosure can be applied to 5G communication and IoT related technology-based intelligent services (e.g., smart homes, smart buildings, smart cities, smart cars or connected cars, health care, digital education, retail business, security and safety related services, etc.). Disclosed is a technology for adding uplink data to a radio resource control (RRC) connection request message corresponding to an RA response message and transmitting the same to a base station when the terminal is in an RRC deactivated state in a method for transmitting, by a terminal, uplink data in a wireless communication system.
Owner:SAMSUNG ELECTRONICS CO LTD
Multiple layer overlay modulation
ActiveUS8503546B1Improve spectral efficiencyTime-division multiplexSecret communicationFiberEngineering
The present invention provides for a communication system and method that overlays signals which are simultaneously mutually orthogonal in both the time and frequency domains, thereby enhancing spectral efficiency. Whereas commonly used sinusoids provide only two mutually orthogonal functions (sine and cosine), certain polynomials provide multiple orthogonal functions, which are also finite in both time and frequency. Using multiple orders of the orthogonal functions allows overlaying signals within a symbol to generate a modulated signal carrying more information than with traditional QAM. Correlating a received signal with locally generated replicas of the orthogonal functions allows demodulation of the signal. This modulation is applicable to twisted pair, cable, fiber, satellite, broadcast and all types of wireless access. The method and system are compatible with many current and future multiple access systems, including EV-DO, UMB, WiMax, WCDMA (with or without MBMS / MIMO), HSPA Evolution, and LTE.
Owner:NXGEN PARTNERS IP
Method for pulse shape design for OFDM
InactiveUS20060039270A1Maximizing bit-error performanceIncrease data rateMultiplex system selection arrangementsSpecial service provision for substationFrequency spectrumWireless transmission
A computationally efficient pulse shaping method for OFDM that produces mutually orthogonal transmission pulses having fast spectral decay is provided. The pulse shaping method comprises an iterative method for designing OFDM transmission pulses that satisfy prescribed time-frequency localization conditions. The iterative method may be implemented in a computationally efficient way and can be used to adapt the transmission pulses to time-varying channel conditions in real-time, thereby maximizing the bit-error performance of an OFDM system while maintaining high data rates in wireless transmission.
Owner:RGT UNIV OF CALIFORNIA
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
Transmitter and method of transmitting and receiver and method of detecting OFDM signals
InactiveUS20140294124A1RobustRaise the possibilityTransmission path divisionAmplitude-modulated carrier systemsCommunications systemGuard interval
A transmitter transmits payload data using Orthogonal Frequency Division Multiplexed (OFDM) symbols. The first OFDM symbol is a first type having a number of sub-carriers which is less than or equal to the number of sub-carriers of the one or more second OFDM symbols of a second type and a guard interval for the first OFDM symbol is selected in dependence upon the longest possible guard interval of the second OFDM symbol. Accordingly an OFDM communications system can be formed in which data is transmitted using a frame structure in which a guard interval is adapted to allow a mix of different types of OFDM symbols.
Owner:SATURN LICENSING LLC
Method and device for transmitting MCS instructing information
InactiveCN103580788AImprove throughputImprove spectral efficiencyModulated-carrier systemsTransmitter specific arrangementsSignal-to-noise ratio (imaging)Frequency spectrum
Owner:CHINA ACAD OF TELECOMM TECH
Method and apparatus for increasing spectral efficiency using mitigated power near band-edge
ActiveUS7151795B1Improve spectral efficiencyReduce power levelPower managementEnergy efficient ICTFrequency spectrumCommunications system
A method and apparatus for increasing the spectral efficiency of communications systems by employing portions of the spectrum, which portions might otherwise be reserved as all or part of guard bands and not utilized (i.e., effectively wasted), for communicating at reduced power levels between devices that are determined to experience relatively high performance (e.g., relatively little path loss, etc.). In a communication system having a first predefined maximum system transmission power level for in-band transmissions, a method is provided for determining that communication performance between a first communication device and a second communication device exceeds a performance threshold. Based on the determination, a first band-edge channel for communication between the first communication device and the second communication device (i.e., transmission from the first device to the second device and / or visa versa) is assigned. Finally, the first communication device and / or the second communication device utilize one or more band-edge channels (each may use a different band-edge channel) for transmitting a relatively reduced power level.
Owner:TAHOE RES LTD
Method for feeding back HARQ
ActiveCN101667900ASave resourcesImprove feedback efficiency andError prevention/detection by using return channelComputer scienceFrequency spectrum
The invention discloses a method for feeding back HARQ, which comprises that: a sending end sends data to one or more receiving ends; a feedback mode of the receiving ends for feedback information ofthe data and / or parameters related to the feedback mode are determined according to channel characteristics, and are notified to the receiving ends. By means of the technical scheme, the feedback modeof the data is determined through the channel characteristics to reduce resources occupied by feedback channels and improve feedback efficiency and spectral efficiency of a wireless communication system.
Owner:ZTE CORP
Device-to-device sending method, receiving method, scheduling method and corresponding devices
InactiveCN105991247AImprove spectral efficiencyError prevention/detection by using return channelSignal allocationNetwork packetComputer science
The invention discloses a device-to-device (D2D) sending method, a device-to-device (D2D) receiving method, a device-to-device (D2D) scheduling method and corresponding devices. The objective of the invention is to improve the transmission efficiency of device-to-device (D2D) communication. The receiving method includes the following steps that: UE1 receives a D2D data packet sent by UE2; and the UE1 checks the D2D data packet and sends feedback information indicating a check result, wherein the feedback information is an ACK or an NACK, if the feedback information is an NACK, the retransmission of the D2D data packet is received. The sending method includes the following steps that: the UE2 transmits the D2D data packet to the UE1; and when the feedback information which is sent by the UE1 and received by the UE2 is an NACK, or the UE2 receives authorization information sent by network side equipment, the UE2 re-transmits the D2D data packet to the UE1. The scheduling method includes the following steps that: the network side equipment sends first authorization information to the UE2 and schedules the UE2 to send the D2D data packet to the UE1; and if the feedback information which is sent by the UE1 and received by the network side equipment is an NACK, the network side equipment sends second authorization information to the UE2 and schedules the UE2 to re-transmit the D2D data packet.
Owner:ZTE CORP
MIMO system with plural access points
InactiveUS20070104165A1Improve fault toleranceEasy maintenanceSite diversityMultiplex communicationSignal processingEmbedded system
A prior art MIMO technique assumes one-to-one communication in which a transmitter and a receiver exist and does not assume a cellular system in which plural access points and access terminals exist. When the prior art is applied to the cellular system, the characteristic can be deteriorated. MIMO signal processing is not performed in access points. Signal processing units in the access points are integrated into an access point controller controlling plural access points and the MIMO signal processing for plural access points is performed together.
Owner:HITACHI LTD
Feedback information processing method, apparatus and system
ActiveCN105024781AImprove adaptabilityIncrease system capacityError prevention/detection by using return channelError detection/prevention using signal quality detectorInformation processingData sharing
Disclosed are a feedback information processing method, device and system, the method comprising: a first transmission node receives a signal of a data sharing channel, and determines the data transmission level indication information of a transmission block according to the signal; and the first transmission node transmits to a second transmission node the data transmission level indication information corresponding to the transmission block.
Owner:ZTE CORP
System and Method for OCDM-Based Photonic Layer Security Robustness to Archival Attack
ActiveUS20100183309A1Enhance resilienceMethod discloseKey distribution for secure communicationMultiple keys/algorithms usagePhase CodeEncryption
A system and method for transporting encrypted data having a transmitter and a receiver is provided. The transmitter generates a sequence of optical pulses, which are copied and output as identical channels. The identical channels are modulated by a plurality of modulators using data to generate a modulated data signal. Respective spectral phase encoders coupled to each of the plurality of data modulators encode respective modulated data signals using a plurality of mutually orthogonal phase codes that are individually associated with the respective spectral phase encoder. These encoded data signals are combined and code-scrambling by a spectral phase scrambler t using a scramble code as an encryption key to generate an encrypted signal. A receiver reverses the encryption to extract the data.
Owner:TELCORDIA TECHNOLOGIES INC
Method and device for channel state information processing
ActiveCN103716078AIncrease capacityImprove spectral efficiencySpatial transmit diversityWireless communicationChannel state informationFrequency spectrum
The invention discloses a method and a device for channel state information processing in order to solve the problem that measurement and feedback of UE cannot adapt to all kinds of transmission modes in the prior art. The method comprises the following steps: UE receives high-level configuration information which is from a base station and indicates one or two CSI-RS resources; the UE receives a corresponding CSI-RS signal according to the high-level configuration information and carries out channel measurement to obtain a channel measurement result; and the UE determines and reports a CSI according to the channel measurement result of the CSI-RS signal, wherein the CSI at least includes a combined CQI which is calculated according to two pre-coding matrixes, and the two pre-coding matrixes are measured according to the CSI-RS signal of one base station. The device comprises a configuration information receiving module, a channel measuring module and a CSI processing module. By the adoption of the technical scheme of the invention, the capacity and spectrum efficiency of the existing system are greatly improved.
Owner:ZTE CORP
Unauthorized resource use methods and system, base station, and user equipment
The present invention discloses an unauthorized resource use method that is applied to a base station. The method includes the steps of acquiring an unauthorized resource that is used in a cell; and broadcasting configuration information of the unauthorized resource of the cell to other base stations, so as to enable the other base stations to determine configuration of unauthorized resources of the other base stations according to the configuration information of the unauthorized resource of the cell. The present invention further discloses an unauthorized resource use method applied to user equipment (UE), a base station, UE, and an unauthorized resource use system.
Owner:ZTE CORP
LED based device with wide color gamut
ActiveUS20150295144A1Enhance interestNarrow emission bandSolid-state devicesLuminescent compositionsBroadbandLight source
The invention provides a lighting unit comprising a source of blue light, a source of green light, a first source of red light comprising a first red luminescent material, configured to provide red light with a broad band spectral light distribution, and a second source of red light comprising a second red luminescent material, configured to provide red light with a spectral light distribution comprising one or more red emission lines. Especially, the first red luminescent material comprises (Mg,Ca,Sr)AlSiN3:Eu and / or (Ba,Sr,Ca)2Si5-xAlxOxN8-x:Eu, and the second red luminescent material comprises K2SiF6:Mn.
Owner:LUMILEDS
Extendable OFDM and ofdma bandwidth distributing method and system
ActiveCN101136894AImprove utilization efficiencyImprove spectral efficiencyTransmission path divisionInter user/terminal allocationFrequency spectrumSpectral efficiency
The invention discloses a method of an extensible OFDM and OFDMA bandwidth distribution, which has the advantages of improved spectrum efficiency and enhanced flexibility and adaptability owing to the extensible single or multi-carrier bandwidth distribution characteristics. The invention also discloses a transmitter and a system of the spectrum bandwidth distribution in the OFDM and OFDMA system. The protection of the band and the sub-carrier can be reduced or deleted so as to improve the spectrum efficiency and the invention has bandwidth expandability.
Owner:NCH 93有限责任公司
Optical coupled resonator structures based on loop-coupled cavities and loop coupling phase
InactiveUS20080273835A1Improve responseImprove spectral efficiencyCoupling light guidesOptical waveguide light guideCouplingWaveguide
A resonator structure includes an input waveguide and an output waveguide. In one embodiment, the resonator structure also includes at least one resonator that couples the input waveguide to the output waveguide and a directional coupler that optically couples the input waveguide to the output waveguide. In another embodiment, the resonator structure includes a plurality of ring resonators that couple the input waveguide to the output waveguide. The plurality of ring resonators include a sequence of ring resonators that form a coupling loop. Each ring resonator in the sequence is coupled to at least two other ring resonators in the sequence and the first ring resonator in the sequence is coupled to the last ring resonator in the sequence so as to form the coupling loop.
Owner:MASSACHUSETTS INST OF TECH
Method for multiplexing cellular user resources of device-to-device (D2D) user pairs based on base station positioning
ActiveCN102123496ASimplify complexityImprove spectral efficiencyWireless communicationCellular networkDevice to device
The invention provides a technical scheme applied in a cellular network of mobile communication, which applies a device-to-device (D2D) technology in the cellular network, and allows D2D user pairs to multiplex resources of cellular network users for communication. The invention provides a method based on base station positioning to select the cellular users for the D2D user pairs for multiplexing resources and selects the cellular user having the farthest distance away from each pair of D2D users to carry out resource multiplexing. In the scheme provided by the invention, the complexity of an algorithm through which a base station end selects the cellular users for resource multiplexing is simplified, and the interference between the D2D user pairs for multiplexing resources and the cellular users is reduced to be lowest, so that the whole frequency spectrum efficiency of the system is improved. In addition, for the method, the practical operability is very strong, the implementation is easy in practice, and the application modes are more flexible.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Increasing data throughput in optical fiber transmission systems
InactiveUS20070222654A1Improve throughputImprove system throughputElectric signal transmission systemsError detection/correctionFiberFrequency spectrum
Data throughput rates are increased in an optical fiber communication system without requiring replacement of the existing optical fiber in a link. Channel throughput is increased by upgrading the components and circuitry in the head and terminal of an optical fiber communication system link. Aggregate throughput in a fiber optic link is increased beyond the range of conventional Wavelength Division Multiplexed (WDM) upgrades, while precluding the necessity of replacing existing fiber plants. The increase in system throughput is achieved by using advanced modulation techniques to encode greater amounts of data into the transmitted spectrum of a channel, thereby increasing the spectral efficiency of each channel. This novel method of increasing transmission capacity by upgrading the head and terminal of the system to achieve greater spectral efficiency and hence throughput, alleviates the need to replace existing fiber plants. Spectrally efficient complex modulation techniques can be supported by interface circuits with an increased level of signal processing capability in order to both encode multiple bits into a transmitted symbol and decode the original data from the received symbols.
Owner:QUELLAN
Data transmission method, data transmission device, base station and user equipment
ActiveCN105992373AReduce data transmission delayEfficient data transferPower managementSignal allocationFrequency spectrumSpectral efficiency
The invention discloses a data transmission method, a data transmission device, a base station and user equipment. The method includes the following steps that: a pre-scheduling signal is sent to the UE (user equipment) before non-authorized carriers are obtained through competition, wherein the pre-scheduling signal is used for instructing the UE to carry out data transmission on the non-authorized resources which are obtained through competition; and data transmission with the UE is carried out according to the pre-scheduling signal. With the data transmission method of the invention adopted, the problems of uncontinuous data transmission and low resource utilization rate which are caused by the limitations of resource competition and resource holding time when non-authorized carriers are adopted to carry out data transmission in the prior art can be solved; limited holding time on the non-authorized carriers can be effectively utilized, spectrum efficiency can be improved, and the time delay effect of the data transmission of the non-authorized carriers can be decreased.
Owner:ZTE CORP
Resource scheduling method and device and base station
ActiveCN102056174AImprove efficiencyImprove spectral efficiencyNetwork planningQuality of serviceFrequency spectrum
The invention discloses a resource scheduling method and device and a base station which are used for lowering the signaling overhead of downlink control channel instructions in uplink and downlink data transmission. The method comprises the following steps: when the judging result shows that the cell of a user terminal is an interference limited cell and a semi-persistent scheduling mechanism needs to be set for the user terminal, configuring semi-persistent scheduling parameters for the user terminal; when the determining result shows that the user terminal needs to adopt the semi-persistent scheduling mechanism to transmit the service data of the access service, allocating semi-persistent scheduling resources for transmitting the service data to the user terminal according to the semi-persistent scheduling parameters; and sending the resource scheduling information of the semi-persistent scheduling resources to the user terminal through the downlink control channel of the user terminal. By adopting the technical scheme of the invention, the signaling overhead of the downlink control channel instructions in data transmission is lowered, the inter-cell interference of the downlink control channel is reduced, and the receptivity of the downlink control channel and the QoS (Quality of Service) and cell spectrum efficiency of users are improved.
Owner:DATANG MOBILE COMM EQUIP CO LTD
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