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535 results about "Mimo transmission" patented technology
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Intelligent backhaul radio and antenna system
ActiveUS8467363B2High path loss exponentWide angular-spreadError prevention/detection by using return channelPolarisation/directional diversitySide informationMimo transmission
Owner:COMS IP HLDG LLC
Multiple Rank CQI Feedback for Cellular Networks
Single user and multiuser MIMO transmission in a cellular network may be performed by a base station (eNB) transmitting either one, two, or more transmission layers. A user equipment (UE) receives a reference symbol from the base station. The UE processes the reference symbol with one or more of a plurality of precoding matrices to form a plurality of channel quality indices (CQI). The UE provides feedback to the eNB comprising one or more feedback CQI selected from the plurality of CQI and one or more precoding matrix indicators (PMI) identifying the one or more precoding matrices used to form each of the one or more feedback CQIs for two or more ranks.
Owner:TEXAS INSTR INC
Intelligent backhaul radio and antenna system
ActiveUS20130044028A1Without any loss in diversityMinimum angular widthError prevention/detection by using return channelPolarisation/directional diversitySide informationMimo transmission
A intelligent backhaul radio have an advanced antenna system for use in PTP or PMP topologies. The antenna system provides a significant diversity benefit. Antenna configurations are disclosed that provide for increased transmitter to receiver isolation, adaptive polarization and MIMO transmission equalization. Adaptive optimization of transmission parameters based upon side information provided in the form of metric feedback from a far end receiver utilizing the antenna system is also disclosed.
Owner:COMS IP HLDG LLC
Link adaptation for MIMO transmission schemes
ActiveUS20030003863A1Reduce in quantitySmall rateError prevention/detection by using return channelSpatial transmit diversityCommunications systemMimo transmission
MIMO transmission methods are applied to communicaiton systems in which a transmitter has more than one transmit antenna and a receiver has more than one receive antenna. Information to be transmitted is divided into a plurality of subsignals according to the number of used transmit antennas and each subsignal is processed separately before it is emitted by the respective transmit antenna. In the receiver the different receive signals are processed thus that subsignals are detected and decoded and the contribution of each detected and decoded subsignal is subtracted from the receive signals and whereby a feedback channel from receiver to transmitter is used to send control information to the transmitter depending on the receive situation. In order to optimize the usage of the MIMO channel the invention proposes the in the receiver the link quality of each subsignal is determined and information of each subsignal is transmitted to the receiver via the feedback channel and that in the transmitter properties of the subsignals are controlled by the link quality information.
Owner:TELEFON AB LM ERICSSON (PUBL)
Cooperative MIMO in multicell wireless networks
A method and system for cooperative multiple-input multiple output (MIMO) transmission operations in a multicell wireless network. Under the method, antenna elements from two or more base stations are used to from an augmented MIMO antenna array that is used to transmit and receive MIMO transmissions to and from one or more terminals. The cooperative MIMO transmission scheme supports higher dimension space-time-frequency processing for increased capacity and system performance.
Owner:ADAPTIX
Pre-coded diversity forward channel transmission system for wireless communications systems supporting multiple MIMO transmission modes
InactiveUS20070099578A1Polarisation/directional diversityTransmission noise suppressionPolarization diversityMimo transmission
A wireless communications system supporting multiple MIMO transmission modes supporting both diversity and directional transmissions under a plurality of different transmission modes comprises a plurality of transmit and receive antenna elements where the transmit antenna elements are arranged to provide polarization diversity. The transmitting station derives actual knowledge of the forward channel by feeding back certain information such as a preferred beam index and a channel quality indicator figure of merit for that beam from the receiving station to the transmitting station along a reverse channel. The receiving station knows the beam weights used by the transmitting station. The transmitting station applies the fed back information to transmit user data intended for the receiving station in the optimal fashion, such as along the preferred beam and at a time when forward channel conditions are satisfactory. The system provides robust single or multiple stream diversity transmission, together with the option of single user or multi-user beamforming to allow on-the-fly trade-offs between coverage gain and capacity in a wireless telecommunications system.
Owner:TENXC WIRELESS
Dual-Layer Beam Forming in Cellular Networks
Single user and multiuser MIMO transmission in a cellular network may be performed by selecting by a base station (eNB) to transmit either one or two transmission layers. When one transmission layer is selected, a first transmission layer is precoded with a first precoder. A first demodulation reference signal (DMRS) sequence or a second DMRS sequence is selected by the eNB and precoded using the first precoder. The first transmission layer is transmitted with the selected precoded DMRS from the eNB to a user equipment (UE), and an indicator is transmitted to the UE to indicate which DMRS sequence is selected and transmitted.
Owner:TEXAS INSTR INC
Reference Signal Resource Allocation for Single User MIMO
ActiveUS20100034312A1Diversity/multi-antenna systemsSecret communicationTelecommunicationsMimo transmission
Transmission with multiple antennas in a wireless network is performed by transmitting a plurality of reference sequences (RS) from a UE. A first RS s1[k] is produced using a first cyclic shift and a base sequence s0[k], wherein k={1, 2 . . . K} is an element index. A second RS s2[k] is produced using a second cyclic shift and s0[k]. A first symbol sequence x1[k] is produced using at least s1[k] and s2[k], for at least one k. A second symbol sequence x2[k] is produced using at least s1[k] and s2[k], for at least one k. x1[k] is transmitted using a first transmit antenna and x2[k] is transmitted using a second transmit antenna.
Owner:TEXAS INSTR INC
Methods For Supporting Mimo Transmission In Ofdm Applications
ActiveUS20070274253A1Spatial transmit diversityTransmission path divisionSpace time transmit diversityMimo transmission
Aspects of the present invention provide MAC enhancements to support the PHY features of a MIMO-OFDMA framework. The MAC enhancements involve DL burst assignment to support adaptive MIMO transmission, UL burst assignment to support adaptive MIMO transmission, fast feedback channel operation to support wireless terminal dynamic feedback of MIMO mode selection, for example space time transmit diversity (STTD) or spatial multiplexing (SM), and / or permutation mode selection, for example diversity or adjacent subcarrier mode, dynamic CQICH allocation and de-allocation and the use of CQICH_ID for DL burst allocation. One or more of these enhancements is included in a given implementation. Methods are also provided for implementing the MAC enhancements.
Owner:APPLE INC
Implicit CSI Feedback for DL Multiuser MIMO Transmission
PendingUS20120270535A1Radio transmissionWireless commuication servicesChannel state informationMimo transmission
This invention is method of implicit channel state information (CSI) feedback for multiuser multiple input, multiple output (MU-MIMO) communication between a base station (eNB) and a plurality of user equipment (UE). Each user equipment reporting a plurality of single user precoding matrix indicators (PMI) including a first PMI indicating a recommended optimum precoding matrix and at least one further PMI indicating information for beamforming at said base station. The base station communicates with each user equipment based on precoding matrix indicators received from the plurality of user equipment.
Owner:TEXAS INSTR INC
Method and apparatus for MIMO transmission optimized for successive cancellation receivers
A method for communicating a plurality of data streams between a transmitting device with multiple transmit antennas and a receiving device, is disclosed. The method comprises determining a list consisting of a subset of the multiple transmit antennas on which the transmitting device will transmit data, determining a set of power weightings, providing the set of power weightings and the list of the subset of the multiple transmit antennas to the transmitting device, weighting a plurality of data streams by the power weightings, and transmitting the power weighted data streams on the subset of the multiple transmit antennas to the receiving device. Another aspect of the invention comprises maintaining a codebook consisting of a plurality of transmit weight vectors at both the transmitting device and the receiving device. The method also comprises determining a list consisting of a subset of the plurality of transmit weight vectors which to use for transmitting the multiple data streams, determining a set of power weightings to be use for each data stream, providing the set of power weightings and the list of the subset of the plurality of transmit weight vectors to the transmitting device, and weighting the data streams by the power weightings and beamforming the data streams with the subset of the plurality of transmit weight vectors.
Owner:GOOGLE TECH HLDG LLC
Antenna transmission and reception system
ActiveUS7069050B2Improve transmission efficiencyImprove efficiencySpatial transmit diversityModulated-carrier systemsMimo transmissionEngineering
A transmitter of a base station includes a data serial-to-parallel converter, M modulators, M beam formers, and transmission antennas. The data serial-to-parallel converter converts transmission data into M sequences. Each modulator modulates the transmission data. Each beam former weights the modulation signal to form directional beams. The transmission antennas narrow the beams and transmit the modulation signals in parallel (MIMO transmission). In a mobile station, a receiver has reception antennas for receiving data transmitted in parallel and an MIMO demodulator for demodulating the data.
Owner:NEC 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
CQI Table for Wireless MIMO Networks
ActiveUS20090245408A1Performance maximizationDiversity/multi-antenna systemsAdaptation strategy characterisationSignal-to-noise ratio (imaging)Mimo transmission
A Channel Quality Indicator table for wireless multiple input multiple output (MIMO) networks is disclosed. In one embodiment, a method of generating a table for channel quality indicator (CQI) for an open loop MIMO transmission includes calculating performance of a link between a transmitter and a user end unit for each MIMO transmission mode over a range of average signal-to-noise ratio, and selecting the MIMO transmission mode that maximizes performance for each subset of the range of average signal-to-noise ratio. The method further includes storing the selected MIMO transmission mode and the corresponding subset of the range of average signal-to-noise ratio in a CQI table, the CQI table being stored in an user end unit and a base transceiver station of the open loop MIMO network.
Owner:APPLE INC
Flexible rate split method for MIMO transmission
InactiveUS20050111376A1Wide diversityReduce error rateSpatial transmit diversityFrequency-division multiplex detailsMimo transmissionSelection system
A method for transmitting a packet of N input bits includes encoding all of the N bits as a single entity, such as with an interleaver of length N within a turbo coder, outputting M encoded bits, channel interleaving the M bits, splitting the M encoded bits into a parallel first and second portion, and transmitting them over separate channels to achieve spatial diversity. The size of the first and second portion is determined based on a closed feedback loop that provides some knowledge of the channel, preferably a measure of channel capacity. The feedback loop may also provide channel knowledge to a subpacket selector associated with each transmit antenna, which determines an appropriate rate for that channel and selects subpackets to fill a transmission packet for that channel. The subpacket selectors choose a subpacket of systematic bits and fill the remaining transmission packet size with subpackets of parity bits. Eigenvectors may be employed to transmit each transmission packet over more than one channel with a power disparity between the channels. A transmitter according to the present invention is also described.
Owner:NOKIA CORP
MIMO Transmission with Rank Adaptation for Multi-Gigabit 60 GHz Wireless
ActiveUS20110222616A1Reduce complexityImprove accuracySecret communicationRadio transmissionMimo transmissionGigabit
A wireless system includes a transmitter with a baseband processor responsive to groups of transmitter antenna arrays for communicating over directional beams; and a receiver with a baseband processor responsive to groups of receiver antenna rays for communicating with the transmitter over the directional beams, the receiver including both a rank adaptation providing a transmit mode feedback to the transmitter and a blind beamforming providing a transmit beamformer index feedback to the transmitter and receiver groups of antenna arrays.
Owner:NEC CORP
Wireless communication system, wireless communication device and wireless communication method, and computer program thereof
InactiveUS20050141631A1Improve transmission performanceFacilitate communicationSpatial transmit diversityRadio transmission for post communicationSingular value decompositionCommunications system
The invention realizes an SVD-MIMO transmission having resistance to the variations in the channel characteristic, which saves the feedback from the receiver to the transmitter. The receiver updates the current one into a new channel matrix Hnew every 100 OFDM symbols, and performs the reception processing by updating the current one into a new decoding weight matrix Unew acquired by the singular value decomposition of the channel matrix Hnew. On the other hand, the transmitter continues to use the original transmission weight matrix V. The diagonal matrix D is turned into a non-diagonal matrix because of the variations in the channel characteristic, where the elements except for the diagonal elements take the values except for zero. This shows that cross talks are generated at this moment. The receiver acquires the cross talk gains, and cancels the cross talk signals of the reception signal to thereby realize the signal transmission without cross talks in consequence.
Owner:SONY CORP
Virtual mimo communication system
ActiveUS7508798B2Create efficientlySite diversitySpatial transmit diversityTelecommunicationsMimo transmission
The present invention provides an effective way to create a virtual MIMO transmission system using mobile terminals that have only one transmit path and antenna. This is accomplished by assigning mobile terminals to a group and assigning certain shared resources and user-specific resources to those mobile terminals in the group. In a synchronized fashion, the mobile terminals will provide uplink transmission in concert, as if they were a single entity having multiple transmission paths and antennas. Preferably, the shared resources bear on how the data is transmitted, and the user-specific resources relate to pilot signals. The data transmitted may be encoded in any number of ways, and in one embodiment, the mobile terminals may relay their information to each other, such that uplink transmissions can incorporate STTD decoding or other space-time codes. The invention is applicable to virtually any multiple access technology, including OFDM, TDMA, and CDMA, preferably synchronous CDMA.
Owner:MALIKIE INNOVATIONS LTD
Method for transmitting information in a mimo radio communication system and radio communication system
InactiveUS20050169396A1Spatial transmit diversityError prevention/detection by diversity receptionCommunication interfaceCommunications system
A method is provided for transmitting information in a radio communication system provided with at least one transmitting station (AP) and at least two receiver stations (MT). The transmitting station (AP) and the receiver stations (MT) are connected together via a radio communication interface. The transmitting stations (AP) includes a transmitting antenna with K<SB>B< / SB>31 antenna elements, whereby K<SB>B< / SB>≧1, and the receiving stations (MT) respectively include a transmitting antenna with K<SB>M< / SB> antenna elements, whereby K<SB>M< / SB>≧1, and which communicate via a MIMO-transmission. The transmitting signals transmitted from the antenna elements of the transmitting antenna of the transmitting station (AP) are produced in a common process and are adapted in relation to the transmitting energy to be used during radiation. Receiving signals received by the antenna elements of the receiver antenna of the receiver stations (MT) are detected in a linear signal process.
Owner:NOKIA SIEMENS NETWORKS GMBH & CO KG
Apparatus and method for changing communication mode in multi-antenna system considering channel environment
An apparatus and a method for determining a multi-antenna transmission mode at a base station in a multi-antenna system are provided. The method for determining the multi-antenna transmission mode includes when using a Multiple Input Multiple Output (MIMO) transmission mode as a multi-antenna transmission mode, determining a reference set point; updating a set point for transmit power control of a terminal according to an error occurrence of a signal received from the terminal; determining whether a channel to the terminal is a channel for applying the MIMO transmission mode by comparing the updated set point with the reference set point; and when the channel to the terminal is not a channel for applying the MIMO transmission mode, changing the multi-antenna transmission mode to a fixed transmission mode.
Owner:SAMSUNG ELECTRONICS CO LTD
Cooperative MIMO in multicell wireless networks
A method and system for cooperative multiple-input multiple output (MIMO) transmission and reception operations in a multicell wireless network. Under the method, antenna elements from multiple base stations and / or multiple antennas are utilized to from an augmented MIMO antenna array that is used to transmit and receive MIMO transmissions at base stations and / or terminals. The cooperative MIMO transmission scheme supports higher dimension space-time-frequency processing for increased capacity and system performance.
Owner:ADAPTIX
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
Methods And Systems For Multiple Input Multiple Output Synthetic Aperture Radar Ground Moving Target Indicator
A multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) system. The radar system includes spatially offset transmitting antennas simultaneously transmitting at least two distinguishable waveform signals and receiving antennas receiving incoming waveform returns for each of the distinguishable waveform signals. The radar system also includes a displaced phase center antenna (DPCA) processing unit adapted to perform processing on the incoming waveform returns, and a synthetic aperture radar processing unit adapted to produce a plurality of spatially-coincident SAR-processed signals. The radar system also generates a plurality of clutter-suppressed signals using the spatially-coincident SAR-processed signals. For each of two MIMO transmissions from spatially displaced transmitters, clutter is cancelled simultaneously in at least two spatially displaced receive channels via DPCA processing. This results in at least two spatially displaced but simultaneous clutter cancelled complex SAR images, which are combined in a monopulse processor to enhance target detection and unambiguously determine target angle.
Owner:SRC INC
Method and apparatus of link adaptation in wireless local area network
ActiveUS20130250904A1Reduce overheadAvoid confictSpatial transmit diversityNetwork topologiesTelecommunicationsMimo transmission
A method of link adaptation performed by an access point supporting multi user(MU) multiple input multiple output(MIMO) in wireless local area network system is provided. The method includes transmitting, to a first station, a physical layer convergence procedure (PLCP) protocol data unit (PPDU) containing a modulation and coding scheme(MCS) request(MRQ) and receiving, from the first station, a MCS feedback(MFB) in response to the MRQ, wherein the first station is one of destination stations of MU-MIMO transmission performed by the access point, and the MFB includes a recommended MCS value computed, by the first station, on the assumption that the first station, as a member of the destination stations, receives data transmitted over at least one spatial stream allocated to the first station in MU-MIMO transmission.
Owner:LG ELECTRONICS INC
Method to negotiate consumed power versus medium occupancy time in MIMO based WLAN systems using admission control
ActiveUS20050185613A1Save powerMinimize air timeEnergy efficient ICTPower managementComputer networkChannel parameter
A method of selectively providing MIMO transmission / reception in a WLAN system includes using a TSPEC reservation and signaling mechanism to instantiate and tear down, dynamically, multi-channel operation in a WLAN; providing an inference algorithm to determine the minimum number of channels required to establish a TSPEC using a MIMO WLAN system; providing specific channel parameters as parameters to be negotiated in the TSPEC; providing frame exchange sequences to be used in Enhanced Distributed Coordinated Access contention based access and to be used in polled access; and providing a mechanism wherein an access point makes a decision as to whether to admit MIMO functionality on a given link, wherein a “link” is a set of communications between two specific WLAN stations.
Owner:SHARP KK
Wireless communication apparatus, wireless communication method, and computer program
ActiveUS20060023669A1Improve transmission performanceReduce power consumptionEnergy efficient ICTError preventionTelecommunicationsMimo transmission
Disclosed are a wireless communication apparatus, a wireless communication method, and a computer program for intercommunication between a plurality of wireless stations. In a reception standby state, packet detection is performed by using a part of the plurality of reception branches to disable the reception operation of the remaining reception branches that do not perform packet detection, and thereby reducing the power consumption during packet detection standby. Further, in a packet reception state, only the minimum necessary number of reception branches for receiving signal that is spatially multiplexed is enabled by MIMO transmission, and thereby reducing the power consumption also during reception of MIMO signals.
Owner:SONY CORP
DMRS port or mapping relation notification, determination method and apparatus
ActiveCN106470088ASuppress interferenceReduce overheadConnection managementRadio transmissionMimo transmissionTransfer mode
Owner:ZTE CORP
Wireless communications system, wireless communications apparatus, wireless communications method and computer program for wireless communication
ActiveUS20050094741A1Improve transmission performanceReduce the amount of informationSpatial transmit diversityMultiplex communicationMultiplexingCommunications system
In performing SVD-MIMO transmission, a set-up procedure is simplified while assuring a satisfactory decoding capability with a reduced number of antennas. A transmitter estimates channel information based on reference signals sent from a receiver, determines a transmit antenna weighting coefficient matrix based on the channel information, calculates a weight to be assigned to each of components of a multiplexed signal, and sends, to the receiver, training signals for respective signal components, the training signals being weighted by the calculated weights. On the other hand, the receiver determines a receive antenna weighting coefficient matrix based on the received training signals.
Owner:SONY CORP
Method and system for MIMO transmission in a distributed transceiver network
A transmitting device comprises a plurality of distributed transceivers, a baseband processor and a network management engine. Data streams are generated at baseband by the baseband processor. Diversity coding such as space-time coding may be performed over the generated data streams in the baseband. The transmitting device concurrently transmits each of the coded streams in a same radio frequency (RF) band to a receiving device over the entire distributed transceivers through associated antennas. When needed, the network management engine may identify one or more auxiliary devices providing available transceivers and antenna beamformers to the transmitting device for sharing. Beam patterns and antenna orientations may be determined for associated antennas of the available transceivers for the transmitting device. Each of the coded data streams in the same radio frequency band may be transmitted to the receiving device over the entire available transceivers for the transmitting device through the associated antennas.
Owner:GOLBA LLC
Method and device for configuring DMRS (demodulation reference signal) scrambling code sequence
InactiveCN102340382AGuaranteed signal demodulation performanceReduce signal demodulation performanceWireless communicationError prevention/detection by diversity receptionMultiplexingMimo transmission
The invention relates to the field of communication, and discloses a method and device for configuring a DMRS (demodulation reference signal) scrambling code sequence so as to reduce signal interference between UE (user equipment) adopting DMRS multiplexing and guarantee the signal demodulation performance of UE. In the method, a base station refers to the current application scene, and indicates the initial value configuration of the downlink DMRS scrambling code sequence used by single UE or UE group in current transmission through a signaling so as to ensure that the inter-cell or in-cell UE can flexibly perform MU (multiple -user)-MIMO (multiple input multiple output) multiplexing, thereby reducing the mutual interference between the multiplexing UE and guaranteeing the signal demodulation performance of the UE; and meanwhile, the overhead of a PDCCH (physical downlink control channel) is reduced through joint coding, the configuration of the same DMRS scrambling code sequence for the UE of different cells can be flexibly supported, and the configuration of different DMRS scrambling code sequences for the UE of the same cell can be flexibly supported, thereby supporting high-rank MU-MIMO transmission and effectively increasing the system throughput.
Owner:CHINA ACAD OF TELECOMM TECH
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