220 results about "Hybrid beamforming" patented technology

A communication method and apparatus using analog and digital hybrid beamforming are provided. The method includes receiving a first message including a measurement and selection condition for hybrid beamforming from a Base Station (BS), measuring channels of a plurality of BS transmission beams, selecting at least one BS transmission beam based on channel measurements, transmitting report information about the selected at least one BS transmission beam to the BS, receiving from the BS a second message, estimating an effective channel matrix for the selected final BS transmission beam according to the measurement and report condition, determining feedback information for digital beamforming of the BS based on the effective channel matrix, transmitting the determined feedback information to the BS, and receiving a data burst from the BS according to a Multiple Input Multiple Output (MIMO) mode and / or a configuration scheduled based on the feedback information.

A system such as a speakerphone may include a processor, memory and an array of microphones. The processor may be configured (via program instructions stored in the memory) to perform automatic echo cancellation, self calibration and beam forming. In particular, the processor may receive input signals from the microphone array and operate on the input signals with a highly directed virtual beam which is a composite of two or more beams which are restricted to respective frequency ranges. The two or more beams may include beams of different kinds, e.g., superdirective beams and delay-and-sum beams.

A method and apparatus for communication in millimeter wave multiple input multiple output (MIMO) communication are provided. A beamforming matrix by groups for terminals that are classified into a group is generated, and a pilot signal that is beam-formed based on the generated beamforming matrix by groups is transmitted to the terminals. Channel information based on the pilot signal is received from the terminals, hybrid beamforming scheduling is performed based on the channel information, and data is transmitted to the terminals based on the scheduling.

A communication method and apparatus using analog and digital hybrid beamforming are provided. The method includes receiving a first message including a measurement and selection condition for hybrid beamforming from a Base Station (BS), measuring channels of a plurality of BS transmission beams, selecting at least one BS transmission beam based on channel measurements, transmitting report information about the selected at least one BS transmission beam to the BS, receiving from the BS a second message, estimating an effective channel matrix for the selected final BS transmission beam according to the measurement and report condition, determining feedback information for digital beamforming of the BS based on the effective channel matrix, transmitting the determined feedback information to the BS, and receiving a data burst from the BS according to a Multiple Input Multiple Output (MIMO) mode and / or a configuration scheduled based on the feedback information.

A hybrid beamforming apparatus and method are proposed for a communication system. The hybrid beamforming apparatus includes a plurality of antennas, a plurality of FFT, a plurality of hybrid weight-coefficient generators and a plurality of adders. In each of the hybrid weight-coefficient generators, the weight coefficient for each subcarrier is calculated by a time-domain correlation matrix and a cross-correlation vector, which is calculated by a frequency domain signal and a training signal. The hybrid beamforming apparatus and method according to the present invention can enhance immunity for multipath effect with lower system complexity.

Automatic detection and accurate time picking of weak events embedded in strong noise such as microseismicity induced by hydraulic fracturing is accomplished by: a noise reduction step to separate out the noise and estimate its spectrum; an events detection and confidence indicator step, in which a new statistical test is applied to detect which time windows contain coherent arrivals across components and sensors in the multicomponent array and to indicate the confidence in this detection; and a time-picking step to accurately estimate the time of onset of the arrivals detected above and measure the time delay across the array using a hybrid beamforming method incorporating the use of higher order statistics. In the context of hydraulic fracturing, this could enhance the coverage and mapping of the fractures while also enabling monitoring from the treatment well itself where there is usually much higher and spatially correlated noise.

A system such as a speakerphone may include a processor, memory and an array of microphones. The processor may be configured (via program instructions stored in the memory) to perform automatic echo cancellation, self calibration and beam forming. In particular, the processor may receive input signals from the microphone array and operate on the input signals with a highly directed virtual beam which is a composite of two or more beams which are restricted to respective frequency ranges. The two or more beams may include beams of different kinds, e.g., superdirective beams and delay-and-sum beams.

A hybrid beamforming apparatus and method are proposed for a communication system. The hybrid beamforming apparatus includes a plurality of antennas, a plurality of FFT, a plurality of hybrid weight-coefficient generators and a plurality of adders. In each of the hybrid weight-coefficient generators, the weight coefficient for each subcarrier is calculated by a time-domain correlation matrix and a cross-correlation vector, which is calculated by a frequency domain signal and a training signal. The hybrid beamforming apparatus and method according to the present invention can enhance immunity for multipath effect with lower system complexity.

Devices and methods of beamforming are generally described. A UE transmits to an eNB a BRSRP report having selected BRSRP values and associated BRS IDs. An active link list, a CSI resource indication, and a first active link are used to measure the CSI resource and CSI feedback is sent. A serving link ID is provided to indicate a second active link to use for control and data reception. Rx beams are trained based on multiple instances of each BRS and the eNB supplies selection criteria for the BRSRP report. The Rx beams are refined based on BRRS and the second active link is dependent on BRRSRP or CSI feedback. When configured for dual beam operation, the BRSRP feedback corresponds to BRSRP value pairs and dual Rx beams associated with a pair of serving link IDs are used.

The channel estimation method for millimeter-wave communication includes virtual multipath acquisition and sparse reconstruction. In the virtual multipath acquisition stage, instead of searching the real multipath components (MPCs), the virtual representation of the real MPCs is derived, and the hierarchical search is utilized to acquire the virtual MPCs based on a normal limited-resolution codebook. In the sparse reconstruction stage, the real MPCs are reconstructed from the virtual MPCs acquired in the virtual multipath acquisition stage. An enhanced sub-array scheme is used to design a hierarchical codebook under a strict constant-modulus constraint. The designed codebook can be used for both analog and hybrid beamforming / combining devices. The training overhead of channel estimation and the complexity of the search are significantly reduced, and the size of the dictionary matrix is greatly reduced by exploiting the results of the virtual multipath acquisition.

The invention discloses a hybrid beam forming method and device in a blind channel. The method comprises the following steps of: on the premise that the receiving signal-to-noise ratio is low and the receiving signal power is maximized, solving by adopting a stochastic gradient descent method according to the solving thought of a Rrassmann space packing problem, so that a simulation-domain beam forming pre-coding matrix of a base station side and a simulation-domain beam forming combination matrix of a user side are obtained; and, in combination with the simulation-domain beam forming pre-coding matrix of the base station side and the simulation-domain beam forming combination matrix of the user side, finding the optimal solution of a digital-domain equivalent channel matrix by adopting a transceiving iterative method based on the time-division duplex channel reciprocity, so that a digital-domain beam forming pre-coding matrix of the base station side and a digital-domain beam forming combination matrix of the user side are obtained. The hybrid beam forming method and device in the blind channel provided by the invention work in a blind channel state; channel state information does not need to be obtained in advance; the method and the device are not limited by channel types; therefore, the computing complexity is greatly reduced; and thus, the method and the device have relatively high practicability.

Various methods and systems are provided to provide for Channel State Information (CSI) feedback of hybrid beamforming. In a first example embodiment, a method for signaling a beamforming reference signal (BFRS) is provided. A resource block is created for the BFRS, the resource block containing a plurality of resource elements, each resource element defined by a time-frequency resource within onesubcarrier and one multiplexing symbol. A total number of analog transmit beams for the BFRS is then determined, along with grouping information for the analog transmit beams for the BFRS. Then, theresource block, the total number of analog beams, and the grouping information are transmitted from a first network controller to user equipment (UE). Then the BFRS is transmitted from the first network controller to the UE.

The invention belongs to the field of millimeter wave massive MIMO systems, in particular to a hybrid beamforming algorithm for massive MIMO. This new algorithm is designed to jointly optimize analogdomain beamforming and digital domain beamforming to maximize spectral efficiency. The invention is divided into two parts: an algorithm of analog beamforming; and the acquisition of a digital beamformer according to the "water injection method" when an analog beamformer is given. The algorithm is applicable to different types of analog networks, including continuously adjustable phase shifter networks, finite-bit adjustable phase shifter networks, switching networks, and the like. The simulation results show that the performance of the algorithm is close to the performance of the optimal all-digital beamforming, and the hybrid beamforming based on the switching networks is close to the performance of the phase shifter networks, which is more conducive to engineering implementation.

Provided are a method and an apparatus for performing communication based on hybrid beamforming in a wireless communication system. Specifically, a user equipment (UE) transmits a dedicated scheduling request to a base station (BS). The dedicated scheduling request indicates a first scheduling request that is a request to transmit beam state information, multiplexed on an uplink data channel, or a second scheduling request that is a request to allocate a resource for a reference signal for beam refinement information. When the dedicated scheduling request indicates the first scheduling request, the UE receives an uplink grant including a response to the first scheduling request from the BS. The UE feeds the BSI back multiplexed on the uplink data channel to the BS.

A system, a method, and a computer program product for transmission of data using a multiple input, multiple output communications system with hybrid beamforming in a layer 1 split architecture. A first portion of a signal is processed at a first portion of a physical layer located in a first portion of a base station. A frequency domain compression with statistical multiplexing is applied to the processed first portion of the signal. A compressed first portion of the signal is generated. The compressed first portion of the signal and a second portion of the signal are transmitted to a second portion of the physical layer located in a second portion of the base station.

A transceiver architecture with combined digital beamforming and analog / hybrid beamforming is proposed. Digital beamforming is used for beam training with reduced overhead (switching time). It is beneficial to estimate all UE's angle of arrival (AoA) at the same time. In addition, the pilot / training signals are transmitted in a narrow band to reduce complexity. Analog / hybrid beamforming is used for data transmission with high directive gain and low complexity. The value of beamforming weights (phase shifter values) in analog domain can be based on the estimation of AoA from beam training. By using digital beamforming for beam training, combined with analog / hybrid beamforming for data transmission, effective beamforming is achieved with reduced overhead, complexity, and cost.

A transmission normalization in a wireless communication system adopting hybrid beamforming is provided. An operating method of a transmitter includes transmitting control information on transmission power normalization, receiving information indicating a precoding matrix and an analog beam selected based on the control information, and transmitting a signal normalized using a normalization coefficient corresponding a combination of the precoding matrix and the analog beam.

Provided is a method for transmitting control information for hybrid beamforming in a wireless communication system. A base station groups a plurality of terminals on the basis of feedback information on analog beams, and multiplexes and transmits control information of terminals within each group by using a specific time-frequency resource. A plurality of terminals can be grouped on the basis of feedback information on a plurality of analog beams through various methods. In addition, control information of terminals within each group can be multiplexed through various methods.

The invention provides a novel hybrid beam forming structure of a millimeter wave MU-MISO system and a setting method. The structure comprises a digital beam former for processing the amplitude and the phase of a signal in a baseband, a plurality of radio frequency chains for performing frequency conversion on the signal, and an analog beam former for performing phase modulation on the radio frequency signal. The method comprises: a sending signal being firstly subjected to digital beam forming on a baseband through the digital beam former, and then being subjected to up-conversion through theradio frequency chain to obtain an analog signal; finally, completing analog beamforming. According to the structure and the method, a low-energy-consumption low-resolution phase shifter and a simpleswitch network are used to realize a dynamic sub-array structure. While the energy consumption is effectively reduced, flexible diversity of a millimeter wave large-scale antenna and multiple users is utilized to compensate performance loss caused by a low-resolution phase shifter and a fixed sub-array, and win-win of system energy efficiency and spectrum efficiency is realized.

The present invention belongs to the technical field of wireless communication, and relates to a digital-to-analog hybrid beamforming method based on uplink training. The method of the invention mainly comprises the following steps: sending by a user terminal a training sequence of a certain length, and receiving by a base station a training signal which travels via free space and is subjected to noise interference; and forming an optimal estimation of the training sequence; through the assumption that the BS knows the training sequence, establishing an objective function wherein the solution of the function is the optimal beamforming matrix; using the reciprocity of the uplink and downlink free-space travel channels to regard the optimal beamforming matrix obtained from the uplink training as the optimal beamforming matrix for the downlink transmission; and then through matrix decomposition, obtaining the beamforming matrixes of the analog domain and the digital domain. The technical schemes of the invention are to eliminate some interference in the analog domain, utilize and improve the idea of orthogonal matching and tracking, search the analog domain beamforming matrix in the codebook set, and finally solve the digital domain beamforming matrix by the least squares method.

The invention provides a hybrid beam forming transmission system and method. The transmission system adopts a sender of a fixed subarray hybrid beam forming structure and a receiver composed of multiple user receiving terminals. The sender sends a channel pilot signal and an equivalent channel pilot signal to the receiver, and each user receiving terminal comprises a simulation merger and a digital merger. The sender comprises a simulation precoding device and a digital precoding device. The sender and the user receiving terminals carry out data downlink transmission based on the determined simulation / digital weighting coefficient. The hybrid beam forming transmission system and method serve as the hybrid beam forming transmission scheme in the fixed subarray connection manner, and have good communication performance.

The invention provides a root value MUSIC-based mixed structure-based angle of arrival estimation method in a large-scale MIMO system. According to the method, analog beamforming and digital beamforming are combined, analog beamforming design is performed by using a phase shift network, a digital beamforming vector is designed by using a root value MUSIC algorithm, so that an angle of arrival of an arrival wave signal is estimated by using a direction ensuring highest receiving power. As the antenna array grows largely, in digital beamformign, each antenna needs a dedicated radio frequency (RF) link, while, mixed beamforming can remarkably reduce RF links so as to remarkably lower hardware cost. Compared with analog beamforming, mixed beamforming may improve the performance remarkably dueto introduction of digital beamforming. The mixed beamforming algorithm considers both the large-scale MIMO system performance and hardware cost, estimates the angle of arrival of the arrival wave signal effectively, and makes angle estimation less complex.

Disclosed is a method and system for digital-analog hybrid beamforming in a millimeter wave downlink channel. A hybrid beamforming method in a downlink channel with respect to at least one user terminal belonging to a transmission apparatus includes receiving feedback information from each of the at least one user terminal; selecting at least one user terminal for transmitting a transmission signal based on the received feedback information; performing digital beamforming with respect to the selected at least one user terminal; and performing analog beamforming with respect to the selected at least one user terminal based on a prestored codebook. The codebook includes a desired number of subsets calculated based on a number of transmit antennas and a number of radio frequency (RF) chains, and each of the subsets includes a number of beamforming vectors corresponding to the number of RF chains.

The invention discloses transmission device and method for energy efficiency multi-mode hybrid beam formation in a wireless communication system. The method is that an emission device with adaptive transmission and beam formation capacity is provided; the baseband beam is formed in a digital domain by multi-space-time stream mapping; the radio frequency beam is formed at an analog domain radio frequency end by phase control; the wireless data transmission rate can be increased through hybrid beam formation multi-stream transmission at the digital domain and the analog domain; the beam can be formed at the digital domain and the analog domain under a multi-stream condition; in case of full stream, the space-time stream and radio frequency links are respectively correspondingly transmitted by the traditional mode; in case of unfilled stream, some radio frequency links can be closed, and all the phase-controlled emission antenna arrays can be used for performing full-domain phase control; therefore, the array antenna gain is utilized to the maximum while the baseband link energy consumption is saved, and as a result, the energy saving and multi-mode compatibility advantages are achieved.

The invention discloses a millimeter wave MIMO hybrid beam forming optimization method based on deep learning. According to the millimeter wave MIMO hybrid beam forming optimization method based on deep learning, constraint conditions in a traditional millimeter wave large-scale MIMO hybrid beam forming optimization problem can be mapped into a neural network, and a multi-user hybrid beam formingsystem is completely converted into an equivalent neural network. Therefore, a complex non-convex optimization problem in hybrid beam forming can be converted into end-to-end unsupervised optimizationsimilar to an auto-encoder, and joint optimization can be carried out on a plurality of beam forming matrixes.

A method for enabling hybrid beamforming in a communication system including a transmitter being able to serve a plurality of receivers, wherein a frequency band comprises at least one subcarrier, wherein each receiver is associated to a set Cprec,k of analog precoiling codewords, said method comprising: —for each receiver, computing (202) an analog precoding matrix FRF k associated to said receiver; said computation (202) comprising: / a / for each subcarrier, performing (202a) a Singular Value Decomposition, SVD, on a channel matrix associated to said receiver and to said each subcarrier; / b / for each subcarrier, determining a first decomposition matrix Vk(1) based on the relative SVD; / c / determining (303) an analog precoding codeword which optimizes a first function g1(Vk(1), . . . , Vk(L), F) of Vk(1), . . . , Vk(L) and F, for a plurality of F E Cprec,k, wherein L denotes a number of subcarriers.

A system and method for hybrid beamforming diversity includes a method by a UE with one or more receive antenna ports, each of the receive antenna ports associated with a plurality of receive beam ports, the method comprising receiving, by the UE, information from a network indicating configurations of one or more transmit antenna ports, each of the transmit antenna ports associated with a plurality of transmit beam ports, the information further indicating a plurality of reference signals, receiving, by the UE, a subset of the reference signals, measuring, by the UE, receive signal quality for each of the subset of the reference signals, determining, by the UE, a selected receive beam port for each of the receive antenna ports, deriving, by the UE, one or more reporting sets, transmitting, by the UE, the one or more reporting sets to the network, and receiving, by the UE, a data transmission.

The invention proposes a hybrid beamforming method based on row vector optimization. The algorithm comprises the following steps: step a, establishing a hybrid pre-coding problem model of a millimeterwave MIMO system; step b, calculating an optimal pre-coding matrix by a transmitting end according to channel information and randomly generating an analog pre-coding matrix; step c, solving a digital pre-coding matrix by the transmitting end under an alternately optimized frame; step d, solving the analog pre-coding matrix by the transmitting end under the alternately optimized frame by using amanifold optimization method; and step e, outputting digital pre-coding and analog pre-coding of a transceiving end. The method proposed by the invention can be used for solving the hybrid pre-codingproblem in the millimeter wave MIMO system under multiple situations. The proposed algorithm can achieve higher spectral efficiency with lower complexity, and has certain innovation and practicability.

The invention discloses a millimeter wave hybrid analog / digital beam forming method based on improved Riemann manifold optimization. The millimeter wave hybrid analog / digital beam forming method comprises the following steps of projecting conjugate gradients to a tangent space to obtain Riemann gradients; searching a point in the tangent space along the Riemann gradient, determining a step lengthby using a Wolfe-Powell criterion, and backtracking the search point to the Riemann manifold; and when a stop condition is met, obtaining an analog beam forming matrix and a digital beam forming matrix through calculation. According to the method, while the algorithm complexity is reduced, the problem that minimum points are missed in the search process is avoided, so that the calculation time isgreatly shortened, the bit error rate is reduced, and the problems that the full-digital beam forming spectral efficiency cannot be achieved through hybrid beam forming and the algorithm complexity istoo high are solved.