Product
Patsnap Eureka
For R&D, Patsnap Eureka makes reading and utilizing patents & technical documents easy.
Patsnap Eureka AIR
Designed for self-driven R&D workflows. Generate viable solutions, solve complex R&D challenges, empower your innovation with AI.
Patsnap Eureka Materials
Designed for material experts only. Revolutionize your material R&D, from search, analyze, to developing new materials.
Feature
TechResearch
Generate reliable direction feasibility study reports for your R&D in just a few steps.
TechSeek
Discover and master advanced knowledge NOW. Basics, ideas, possibilities, all at once.
TechMind
As an expert in R&D Theories, TechMind can generates customized viable solutions instantly.
TechRisk
Analyze your overall solution with one click, know your potential R&D risks in advance.
TechMonitor
Get weekly tech updates, stay abreast of the latest tech innovations and key insights.
Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
2398 results about "Spectral efficiency" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Spectral efficiency, spectrum efficiency or bandwidth efficiency refers to the information rate that can be transmitted over a given bandwidth in a specific communication system. It is a measure of how efficiently a limited frequency spectrum is utilized by the physical layer protocol, and sometimes by the media access control (the channel access protocol).
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
Carrier interferometry networks
ActiveUS20080095121A1Improve throughputImprove bit error rateEnergy efficient ICTModulated-carrier systemsWireless mesh networkTelecommunications link
Applications of CI processing to ad-hoc and peer-to-peer networking significantly improve throughput, network capacity, range, power efficiency, and spectral efficiency. CI-based subscriber units perform network-control functions to optimize network performance relative to channel conditions, network loads, and subscriber services. CI codes are used to identify and address network transmissions. Channel characteristics of communication links are employed to encode, address, and authenticate network transmissions. CI transceivers used as relays and routers employ unique characteristics of transmission paths to code and decode network transmissions. A central processor is adapted to perform array processing with signals received from, and transmitted by, a plurality of subscriber units in a wireless network.
Owner:GENGHISCOMM HLDG
Method and system for controlling medium access in a wireless network
InactiveUS20060164969A1Simple designEasy to manufactureEnergy efficient ICTSpatial transmit diversityFrequency spectrumSpectral efficiency
A method and system are disclosed that can be applied to achieve high-throughput in a WLAN. Central to the present invention is the use of an SDMA compatible multi-beam antenna system by a WLAN access point. A system based on two types of antennas-dynamic beam forming and fixed beam antennas—is described. A mechanism and protocol are described that implement simultaneous transmissions with respect to an SDMA compatible access point and thereby improve spectral efficiency, and by extension achieve higher throughput. Based on the recognition that current WLAN MAC has major limitations in throughput, certain MAC extensions (that can be applied independently of SDMA) are described. Also disclosed are power-saving and power control techniques that improve battery performance and contribute to a reduction in station size, and a means of reducing channel interference. The present invention also deals with the problem of backward compatibility with conventional devices that implement the protocol that is a subset covered by the present invention.
Owner:SOVEREIGN PEAK VENTURES LLC
Multi-antenna transmission method and system
InactiveUS7403748B1Improve transmission gainImprove channel estimation performanceSpatial transmit diversityTransmission monitoringFrequency spectrumSignal quality
The present invention relates to a method and system for transmitting a transmission signal from an antenna array (19) to a receiving means (20) of a wireless communication system, wherein a signal quality measurement is performed at the receiving means (20) for predetermined antennas or beams of said antenna array (19). Based on a feedback information derived from the signal quality measurement, at least two of the predetermined antennas or beams of the antenna array (19) are selected. The selected antennas or beams are used for transmitting said transmission signal according to a transmit diversity or beamforming scheme. Thus, spectral efficiency and diversity gain can be enhanced by using only selected ones of the predetermined antennas or beams.
Owner:WSOU INVESTMENTS LLC
Method and apparatus for uplink power control in a communication system
InactiveUS20080188260A1Power managementTransmission control/equalisingCommunications systemTransmitted power
A communication system optimizes cell edge performance and spectral efficiency by a first step of measuring, by the Node B, at least one system performance metric. A next step includes sending, by the Node B, an indicator for the at least one system performance metric measurement. A next step includes receiving the indicator for the at least one system performance metric measurement. A next step includes determining an adaptive power control parameter based on the at least one system performance metric measured by the Node B and system performance metrics measured by at the least one other neighboring Node B. A next step includes using the adaptive power control parameter to update an uplink transmit power level for at least one user equipment served by the Node B.
Owner:MOTOROLA MOBILITY LLC
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
Method of maximizing MIMO system performance by joint optimization of diversity and spatial multiplexing
InactiveUS20060098760A1Increase communication robustnessImprove spectral efficiencyAmplitude-modulated carrier systemsDiversity/multi-antenna systemsTime domainCommunications system
A method of transmission in a wireless communication system having a transmitter and a receiver. In the transmitter: signals are encoded using a space-domain precoder for spatial multiplexing, time-domain variable delay is introduced at each signal communication path for time diversity, and the signal are transmitted to the receiver. In the receiver the signal transmissions from the transmitter are decoded using a space-domain decoder, wherein time diversity and spatial multiplexing are combined, to increase communication robustness and spectral efficiency.
Owner:SAMSUNG ELECTRONICS CO LTD
Method for simultaneously multiplexing multiple cellular user resources by D2D (Device-to-Device) user pair
ActiveCN102083138AHigh data rateNetwork traffic/resource managementInterference (communication)Frequency spectrum
The invention provides a technical scheme which is applied to a cellular network for mobile communication. A D2D (Device-to-Device) technology is applied to the cellular network, and thereby a D2D user pair is allowed to simultaneously multiplex multiple cellular network user resources to communicate. In addition, a mode for maximizing system data rate is selected from the scheme and a traditional scheme to realize resource sharing. The scheme proposed by the invention cannot cause great interference to certain cellular user and is easy to realize and relatively flexible to apply in actuality. The invention provides a method for simultaneously multiplexing multiple cellular user resources by single D2D user pair in the cellular network with D2D communication, which can be used for increasing the frequency spectrum efficiency of a system whole (including cellular communication and D2D communication) under the condition of guaranteeing the lowest communication rate of a cellular user. The method provided by the invention has strong actual operability.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Adaptive air interface waveform
InactiveUS6847678B2Reduce and eliminate disadvantageReduce and eliminate and problemError correction/detection using LDPC codesCriteria allocationFrequency spectrumSpectral efficiency
In one embodiment, a method for generating an adaptive air interface waveform includes generating a waveform that includes a variable carrier frequency and variable bandwidth signal. The variable bandwidth signal includes one or more subcarriers that are dynamically placeable over a range of frequencies, and each subcarrier is separately modulated according to a direct sequence (DS) spread spectrum (SS) technique. The waveform has an embedded pilot usable to optimize one or more spectrum efficiencies of the waveform. A modulation constellation, a code rate, and a code length of the generated waveform are adapted according to an available spectrum and one or more sub-carrier conditions.
Owner:POWERWAVE COGNITION INC
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
Performance and Cost Global Navigation Satellite System Architecture
ActiveUS20160011318A1Improve performanceCost effectiveSatellite radio beaconingAviationFrequency spectrum
Significant, cost-effective improvement is introduced for Position, Navigation, and Timing (PNT) on a global basis, particularly enhancing the performance of Global Navigation Satellite Systems (GNSS), an example of which is the Global Positioning System (GPS). The solution significantly improves performance metrics including the accuracy, integrity, time to acquire, interference rejection, and spoofing protection. A constellation of small satellites employing a low-cost architecture combined with improved signal processing yields an affordable enabler for spectrum-efficient transportation mobility. As air traffic management modernization transitions to a greater dependence on satellite positioning, the solution provides aviation users new protections from both intentional and unintentional interference to navigation and surveillance. And in response to an era in which intelligent transportation is under development for automobiles, reliable where-in-lane positioning enables new applications in connected and autonomous vehicles. New military capability increases PNT availability.
Owner:PNT HLDG INC
ABS-based Method for Inter Cell Interference Coordination in LTE-Advanced Networks
The Long Term Evolution Advanced (LTE-A) network, is a heterogeneous network, where macro and pico base stations (BSs) coexist to improve spectral efficiency per unit area. Systems and methods described herein attempt to provide a solution to the interference coordination problem between macro BSs and pico user equipments (UEs). Specifically, the systems and methods conduct interference coordination based on the concept of almost blank subframe (ABS), which is supported by the LTE-A standard. The macro BSs choose their ABS configurations in a cooperative way such that the overall system throughput is optimized.
Owner:HITACHI LTD
System and method for providing SOHO BTS coverage based on angle of arrival of mobile station signals
InactiveUS20080026763A1Optimizes RF coverageControl interferenceEnergy efficient ICTRadio/inductive link selection arrangementsFrequency spectrumTransmitted power
Beamforming techniques to limit radiated power where there is the potential for interference with macro-cellular coverage or with adjacent mobile stations. Smart antenna beamforming techniques (including the use of angle of arrival information) are combined with access probe information to determine the direction for radiated power and the level of the needed transmitted power as well for the small office or home (SOHO) environment. The placement of RF power in the SOHO specific to where it is needed, minimizes radiating power in directions where it will cause interference with macrocell coverage. In addition, the beamforming techniques provide a base transceiver station with an economical method to quickly solve coverage issues internal to a SOHO, without introducing interference external to this coverage environment. In addition, there specific placement of the RF power where it is needed provides an increase in spectral efficiency of a deployed network.
Owner:SAMSUNG ELECTRONICS CO LTD
Mode lookup tables for data transmission in wireless communication channels based on statistical parameters
InactiveUS7191381B2Error detection/prevention using signal quality detectorNetwork traffic/resource managementQuality of serviceSignal quality
A method and medium tangibly embodying the method of constructing a lookup table of modes for encoding data for transmission in a wireless communication channel from a transmit unit to a receive unit by using at least one quality parameter of the data and its first-order and second-order statistical parameters to arrange the modes in the lookup table. The first-order and second-order statistical parameters can be determined from a simulation of the wireless communication channel or from field measurements of the wireless communication channel. The modes in the lookup table are ordered by a target value of a communication parameter such as PER, BER, data capacity, signal quality, spectral efficiency, throughput or another suitable communication parameter set to achieve a desired quality of service. The quality parameter selected is conveniently a short-term quality parameter such as signal-to-interference and noise ratio (SINR), signal-to-noise ratio (SNR) or power level. During use adjustments depending on the instantaneous condition of the channel can be used to tune the lookup table.
Owner:INTEL CORP
MIMO communication system using an adaptive transmission mode switching technique
ActiveUS20060083195A1Improve spectral efficiencyMultiplex communicationRadio transmissionFrequency spectrumMimo transmission
A multiple-input multiple-output (MIMO) wireless communication system. A transmitter that includes a plurality of transmit antennas selects one of a spatial multiplexing scheme and a spatial diversity scheme, processes a signal in the selected transmission scheme, and transmits the signal through the plurality of transmit antennas. A receiver that includes a plurality of receive antennas processes a signal in a reception scheme mapped to a transmission scheme of the transmitter. The transmission schemes include a transmission scheme for maximizing diversity gain and a transmission scheme for maximizing spectral efficiency. The MIMO communication system using an adaptive transmission mode switching technique performs switching between MIMO transmission modes using spatial selectivity of a channel, thereby obtaining maximum gain in a signal to noise ratio (SNR) and spectral efficiency according to channel state.
Owner:SAMSUNG ELECTRONICS CO LTD +1
Adaptive Medium Access Control
ActiveUS20120182867A1Controlling the riskError preventionTransmission systemsPerformance enhancementTraffic flow
Bandwidth allocation configuration and fully decentralized adaptive medium access control (AMAC) systems and methods with support for time critical applications, spectrum efficiency, scalability enhancements, and fair allocation of bandwidth among nodes sharing a common channel. The methods fully integrate TDMA and CSMA / CA channel access approaches and incorporate adaptive congestion and collisions avoidance scheme to reduce bandwidth wastage and diminish adverse cross layers interactions. AMAC improves support for multi-media traffic while allowing higher transmission incidents from large number of transmitting devices sharing a common channel, with fair distribution of the available bandwidth, to enable improved multi-level-security connectivity over a common multi-hop wireless network, provide end-to-end performance enhancement for constant bit rate traffic, variable bit rate traffic, and distribute bandwidth fairly amongst competing TCP traffic flows that traverse varying length paths in multi-hop ad-hoc wireless networks.
Owner:THE JOHN HOPKINS UNIV SCHOOL OF MEDICINE
Audio/video and data signal redistribution system
InactiveUS20020007490A1Easy to operateReduce system costTelephonic communicationAnalogue secracy/subscription systemsElectrical conductorTelevision receivers
A system for redistributing a multiple input audio / video and data signals having a redistributing device equipped to receive signals in a multiple formats and redistribute a selected signal to a user's premises over conductors, preferably existing twisted-pair telephone wire. The redistributing device is in interactive communication with a communications interface located in the user's premises which receives user-input control signals and contains switching circuitry which routes the selected signal to the user's premises where it is received by the receiving unit such as a television receiver. A single redistributing device services an entire multi-user network from a common distribution point, and services multiple users independently. The system of the invention does not interfere with normal use of the telephone network, so users can interactively access services provided by the system and use the telephone at the same time. In one preferred embodiment the system of the invention dynamically allocates frequencies and modulation techniques to various output signals, to maximize spectral efficiency and minimize interference and cross-talk.
Owner:NORTHVU
Method and apparatus for allocating a beacon signal in a wireless communications network
InactiveUS20060089141A1Improve spectral efficiencyReduce power consumptionAssess restrictionPosition fixationAdjacent-channel interferenceFrequency spectrum
A method and apparatus for transmitting beacon signals in a wireless communications network. For a given cell site, a single frequency may be used for the beacon signal by assigning different beacon signal time slots to different sectors of the cell site. During one time slot, the beacon signal is transmitted to one of the sectors, and during another one of the time slots, the beacon signal is transmitted to a different one of the sectors. Because a single frequency can be used for all of the sectors of a cell site, more frequencies are available for other purposes, such as for user traffic, for example. The invention improves spectral efficiency, reduces adjacent channel interference and co-channel interference and allows power consumption to be controlled.
Owner:CINGULAR WIRELESS II 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 and apparatus for uplink power control in a frequency division multiple access communication system
A communication system optimizes cell edge performance and spectral efficiency by determining an adaptive power control parameter based on system performance metrics measured by a serving Node B and further measured by, and reported to the serving Node B by, neighboring Node B's. The adaptive power control parameter is then used to determine an uplink transmit power of a user equipment (UE) served by the serving Node B. The uplink transmit power may be determined by the Node B and then conveyed to the UE, or the Node B may broadcast the adaptive power control parameter to the UE and the UE may self-determine the uplink transmit power. In addition, as a frequency reuse factor of one has been proposed for such communication systems, interference levels may be even further improved by employment of an intra-site interference cancellation scheme in the sectors serviced by the Node B.
Owner:GOOGLE TECH HLDG LLC
Optical double sideband modulation technique with increased spectral efficiency
InactiveUS20060269295A1Eliminate needMinimize pass-through lossMultiplex system selection arrangementsWavelength-division multiplex systemsFrequency spectrumSpectral efficiency
An all optical network for optical signal traffic has at least a first ring with at least one transmitter and one receiver. The first ring includes a plurality of network nodes. At least a first add / drop broadband coupler is coupled to the first ring. The broadband coupler includes an add port and a drop port to add and drop wavelengths to and or from the first ring, a pass-through direction and an add / drop direction. The first add / drop broadband coupler is configured to minimize a pass-through loss in the first ring and is positioned on the first ring.
Owner:OPVISTA +2
Method and apparatus for uplink resource allocation in a frequency division multiple access communication system
ActiveUS20070178930A1Power managementNetwork traffic/resource managementFrequency spectrumCommunications system
To address the need for a resource allocation scheme that results in a better tradeoff between the cell-edge performance and the overall spectral efficiency, a communication system is provided that allocates uplink transmit power to user equipment (UEs) based on a fractional power control scheme. In another embodiment, since the cell-edge users are also likely to be power limited, the communication system may implement a minimized uplink transmission bandwidth resource allocation scheme that may work with the fractional power control scheme to achieve a level of performance desired for uplink transmissions in 3GPP (Third Generation Partnership Project) and 3GPP2 Evolution communication systems.
Owner:GOOGLE TECH HLDG LLC
Communication System Using Relay Base Stations with Asymmetric Data Links
InactiveUS20080075178A1Improve communication efficiencyFrequency-division multiplex detailsNetwork topologiesCommunications systemFrequency spectrum
The invention relates to a method is shown for improving the spectral efficiency of a communication system (100) that comprises at least one Super Base Station SBS (1) and at least one terminal (3-1), wherein at least one Relay Base Station RBS (2-1s used to relay asymmetric up- and downlink data between said at least one Super Base Station SBS (1) and said at least one terminal (3-1) and wherein said asymmetry of said up- and downlink data is considered when dynamically allocating transmission resources to said relay link (5-1, 6-1) between said at least one SBS (1) and said at least one RBS (2-1) and to said link (7-1, 8-1) between said at least one RBS (2-1) and said at least one terminal (3-1).
Owner:WSOU INVESTMENTS LLC
TDD FDD air interface
InactiveUS6859655B2Improve spectral efficiencyFast frequency switchingTime-division multiplexRadio/inductive link selection arrangementsFrequency spectrumTelecommunications
Downlink and uplink frequencies in a wireless access system are time-shared by adjacent sectors, but remain dedicated to downlink or uplink transmission and may utilize FDD-only bandwidth within the MMDS spectrum. TDD wireless access equipment need only be modified by introducing a frequency change at the normal TDD guard point, with respective downlink or uplink periods for adjacent sectors offset to form overlapping frames. Cyclo-stationary processing, block equalization, and burst timing coordination allow the boundary between downlink and uplink portions of both frames to be set dynamically, improving spectral efficiency. Fast frequency switching within an allotted physical slot enables synchronization of time-sharing the dedicated frequencies to be maintained among sectors and cells. Duplex spacing between downlink and uplink frequencies for a given sector and adjacent sectors, combined with in-depth filtering of received signals, prevents spurious out-of-band transmission signal strength from reaching an interference level.
Owner:RAZE TECH
Method of maximizing MIMO system performance by joint optimization of diversity and spatial multiplexing
InactiveUS7627051B2Improve efficiencyImprove robustnessModulated-carrier systemsDiversity/multi-antenna systemsTime domainCommunications system
A method of transmission in a wireless communication system having a transmitter and a receiver. In the transmitter: signals are encoded using a space-domain precoder for spatial multiplexing, time-domain variable delay is introduced at each signal communication path for time diversity, and the signal are transmitted to the receiver. In the receiver the signal transmissions from the transmitter are decoded using a space-domain decoder, wherein time diversity and spatial multiplexing are combined, to increase communication robustness and spectral efficiency.
Owner:SAMSUNG ELECTRONICS CO LTD
Digital subcarrier optical network utilizing digital subcarrier cross-connects with increased energy efficiency
ActiveUS20120269510A1Reduce power consumptionReduce energy consumptionEnergy efficient ICTModulated-carrier systemsFrequency spectrumSpectral efficiency
The present invention provides reduced power dissipation and other benefits at the optical transport network layer by utilizing a digital subcarrier optical network comprising multiple digital subcarrier cross-connect switches. This offers several advantages for optical networks, including spectral efficiency and robustness against signal corruption and consumption of less energy than traditional TDM-based electric switches (OTN / SONET / SDH).
Owner:BOARD OF RGT THE UNIV OF TEXAS SYST +1
Reconfigurable intelligent surface assisted multi-user MIMO uplink transmission method
ActiveCN111010219AReduce complexityMitigate multipath propagationSpatial transmit diversityHigh level techniquesChannel state informationMimo transmission
The invention provides a reconfigurable intelligent surface assisted multi-user MIMO uplink transmission method. According to the transmission method, a signal sent by a user side is reflected to a base station through an RIS, and the RIS can change the phase of the signal incident on the RIS. Aiming at a bottleneck problem of channel information acquisition of an RIS-assisted multi-user MIMO transmission system, only partial channel state information is utilized, including instantaneous channel state information from the RIS to a base station channel and statistical channel state informationfrom a user to the RIS channel; through an alternate optimization method, a deterministic equivalence principle, a block coordinate descent method, an MM method and the like, a sending covariance matrix and an RIS phase shift matrix of a user are jointly designed to maximize the global energy efficiency of the system or traverse the spectral efficiency; when the channel state information is changed, the user side dynamically implements transmission power distribution with maximum energy or spectral efficiency, and the RIS dynamically adjusts the phase shift matrix. According to the invention,the implementation complexity is low, and the performance of multi-user MIMO uplink transmission can be effectively improved.
Owner:SOUTHEAST UNIV
User position list-based method for selectively multiplexing multiple honeycomb user resources for device to device (D2D) user pairs
ActiveCN102088736AReduce distractionsReduce complexityNetwork traffic/resource managementMultiplexingSpectral efficiency
The technical scheme provided by the invention is applied to a honeycomb network of mobile communication. A device to device (D2D) technology is applied to the honeycomb network, so that D2D user pairs are allowed to multiplex the resources of honeycomb network users for communicating. The invention provides a user position list-based method for selectively multiplexing multiple honeycomb user resources for the D2D user pairs, which is used for selecting a plurality of honeycomb users farthest from the D2D user pairs for each pair of D2D users for resource multiplexing. By using the scheme provided by the invention, the complexity of an algorithm is lowered when a base station end selects a plurality of honeycomb users for resource multiplexing, and the interference between the resource multiplexing D2D user pairs and the honeycomb users is reduced to the maximum extent, so that the spectrum efficiency of an entire system is improved. Moreover, the method has high practical operability, is easy to implement in practice, and is applied more flexibly.
Owner:BEIJING UNIV OF POSTS & TELECOMM
Method and system for single-sideband optical signal generation and transmission
InactiveUS6661976B1Modulation with suppressed carrierAmplitude-modulated carrier systemsTransport systemFrequency spectrum
A method and system for generating and transmitting optical signals with only one sideband. Single-sideband optical signal transmission reduces the signal impairment effects associated with dispersion. Such transmission also increases the spectral efficiency of optical transmission systems. Single-sideband modulation also makes possible electrical compensation for optical link dispersion during transmission. Single-sideband modulation is generated using the modulating data signal and its Hilbert transform, which is approximated by a tapped-delay time filter. Line coding is used to remove the low-frequency content in the modulating data signal, avoiding the inefficiencies of tapped-delay-line filter approximated Hilbert transformers at low frequencies. Line coding can also help optical single side band signal generation and transmission using a simple optical filter instead of Hilbert transformers.
Owner:AMERICAN TELEPHONE & TELEGRAPH CO
Who we serve
- R&D Engineer
- R&D Manager
- IP Professional
Why Patsnap Eureka
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com