441 results about "Transmission matrix" patented technology

A multi-user MIMO downlink beamforming system with limited feed forward (200) is provided to enable preceding matrix information to be efficiently provided to a subset of user equipment devices (201.i), where zero-forcing transmit beamformers (w_i) are computed at the base station (210) and assembled into a precoding matrix (W). The precoding matrix is encoded using a compact reference signal codebook (225, 207.i) for forward link signaling, either by sending bits indicating the index of the transmission matrix used, or by transmitting one or more precoded pilots or reference signals wherein the pilot signals are precoded using vectors uniquely representative of the transmission matrix used which includes candidate reference signal matrices which meet a predetermined condition number requirement, such as a condition number threshold. The preceding matrix information (227) is extracted at the user equipment devices (201.i) using the compact reference signal codebook (207.i) and used by the MMSE receiver (209.i) to generate receive beamformers (v_i).

A space-time-frequency block coding apparatus and method in a transmitter with three transmit (Tx) antennas are provided. An input symbol sequence is transmitted through three Tx antennas according to a permutation method using a selected transmission matrix in order to improve the performance of an STFBC.

Methods and apparatuses for information feedback and precoding have been provided. A method for processing communication data at a user equipment in a wireless communication system may comprise: deriving a spatial correlation matrix R of multiple transmit antennas of a base station based on an obtained downlink channel transmission matrix H; transforming a precoding codebook F according to the spatial correlation matrix R; selecting a precoding matrix F_s based on the transformed precoding codebook; and feeding back information about the spatial correlation matrix R and information about the selected precoding matrix F_s to the base station. A method for data precoding at a base station in a wireless communication system may comprise: obtaining, from a user equipment, information about a spatial correlation matrix R of multiple transmit antennas of the base station and information about a precoding matrix F_s selected by the user equipment; determining a desired precoding matrix F_R,s based on the obtained information and a precoding codebook; and precoding downlink data to be transmitted to the user equipment with the desired precoding matrix F_R,s

When using four transmit antennas, conventional channel coding is employed for a decoupled space-time coding approach for each of a number, L, of data substreams derived from the overall source bit stream. The symbols of the data substreams, after any encoding, are processed and the resulting derivatives of the encoded data substreams, which includes at least the complex conjugate of one of the encoded symbols, are grouped to form four transmit time sequences each one spanning L symbol periods which form a transmission matrix B. Each row of the matrix corresponds to an antenna, and the elements of each row represent the samples of a temporal sequence that is emitted by the antenna in L symbol periods. When L=4 the matrix B can be arranged as follows:

where b₁, b₂, b₃, and b₄ are the encoded symbols from the data substreams and * indicates complex conjugate.

The invention discloses a linear precoding method in a multiuser multi-input and multi-output (MIMO) system, which comprises the following steps: determining the interference channel transmission matrix HK in the system of each user according to the channel estimation results, wherein, k is user index, k is in the range from 1 to K, and K is the user number served by the system base station simultaneously in the same band range; carrying out the QR decomposition to the conjugate transposed matrix HK<H> of a random user's interference channel transmission matrix HK, and forming the user's linear precoding matrix T<k> according to the QR decomposition result; and carrying out the linear precoding to each user's emission signal s<k> respectively by utilizing the formed linear precoding matrix T<k>.

The invention provides a three-dimensional iterative computing method for environment capacity of multiple atmospheric pollutants. The method comprises the steps of building a regional complex atmospheric pollution environment capacity three-dimensional iterative computing model based on a pollution source emission list and a meteorological model; establishing a pollution source three-dimensional classification method and an acceptor site optimization selection hierarchical classification method according to space distribution of pollution sources, industry types and pollutant indexes; establishing a dynamic iterative computing method for a space transmission matrix, an industry contribution matrix and a precursor contribution matrix by utilizing the environment capacity three-dimensional iterative model; and iteratively computing the environment capacity of the atmospheric pollutants such as SO2, NOx, particulate matters, NH3, VOCs and the like in regions and sub-industries by adopting a multi-objective nonlinear optimization technology according to the space, industry and precursor contribution matrixes. According to the method, the effects of regional transfer of PM2.5, industry coupling, precursor nonlinear collaboration and the like are comprehensively considered and the deficiencies of an existing environment capacity computing method are made up for.

A method and apparatus for switching signals through a switch matrix are disclosed. The apparatus comprises an input module and an output module. The input module has a plurality of inputs typically equal to a number of cells in a reuse pattern, and the inputs receiving at least one uplink beam. The input module also has a plurality of outputs, the plurality of outputs is typically equal to the number of subbands in the uplink beam. The output module is coupled to the input module and selectively couples the outputs from the input module to an output of the output module. The method comprises the steps of grouping the uplink signals into a plurality of groups, the number of groups typically equal to a number of cells in the cell-based transmission matrix, where each group comprises a signal from each frequency used in the frequency reuse pattern. Each group of uplink signals is then separated into subband signals, which are then grouped together into groups of similar subband signals. The groups of similar subband signals are then forwarded to demodulators for processing within the satellite system.

An arrangement to transmit magnetic resonance signals has a local coil composed of a number of individual antennas for acquisition of radio-frequency signals of a magnetic resonance examination. Preamplifiers amplify the radio-frequency signals, and a transmission device transmits the radio-frequency signals from the local coil to the preamplifiers. The transmission device is fashioned as a readout coil and has a number of individual antennas. The individual antennas of the readout coil are magnetically coupled with the individual antennas of the local coil, with the individual antennas of the local coil and the individual antennas of the readout coil forming a linear MIMO transmission system describable by a transmission matrix.

The invention provides a programmable optical component based on a scattering medium, an optical field regulation system, and an optical field regulation method, and solves technical problems that a conventional optical component has single function, is high in optical wave modulation cost, has complex apparatus and low integration degree. The system in the invention is successively provided with a light source beam expanding module, a modulation module, a scattering medium microscopic module and a detection module, a data processing module arranged between the modulation module and the detection module. A computer circularly controls a space light modulator to modulate an input optical field, and a detector detects an output optical field; then data shaping is carried out and an optical transmission matrix of the scattering medium is detected; and then a programmable optical component is constructed so as to achieve optical field regulation with methods such as optical phase conjugation, phase retrieval, speckle reconstruction and the like, wherein the optical field regulation includes imaging, chromatic dispersion, abnormal chromatic dispersion, focusing, shaping, etc. The programmable optical component and the system are intelligent, multi-functional, low-cost, easy to operate, highly integrated and strong in operability, and can be applied to the scientific research fields such as military science, bio-medicines, integrated optic, nano photonics, etc.

The invention discloses a foundation pile foundation model analyzing method and a test device for the same. The method includes: building a dispersing spring support model of to-be-tested pile-earth related actions, building a to-be-tested pile inner force and deformation equation and transmission matrix, and a to-be-tested pile foundation reaction analyzing basic equation, building different founding reaction models and programming a corresponding computerizing program, arranging the foundation pile foundation test device in the field, measuring horizontal displacement and turning angle, on the ground, of the to-be-tested pile, and computerizing and analyzing according to the computerizing program to determine corresponding foundation reaction model parameters. The foundation pile foundation test device comprises a standard beam, a standard pile, a reaction pile and the to-be-tested pile which are disposed on the ground, a jack and a force sensor are connected between the reaction pile and the to-be-tested pile, and a angle measuring device and a displacement measuring device are disposed on the to-be-tested pile. By on-site pile testing, multiple hypothesis models can be built for the foundation pile foundation, related model parameters can be determined, and certain universality is achieved.

The present invention relates to a multiple antenna transmitting/receiving apparatus that performs a hybrid automatic repeat request, and a retransmission method thereof. An initial transmission signal is encoded into the form of an initial transmission matrix and transmitted to the receiving apparatus, the initial transmission matrix corresponding to a linear dispersion code, with a result of error checking performed on the initial transmission signal by the receiving apparatus. When an error is detected in the initial transmission signal, a first retransmission signal is generated by encoding the initial transmission signal in the form of a retransmission matrix and transmitted to the receiving apparatus. The retransmission matrix is formed of constituent elements of the initial transmission matrix but different from the initial transmission matrix, and corresponds to a linear dispersion code having the same capacity and diversity gain as those of the initial transmission matrix.

The present invention provides a method of calibrating a wireless tracking system and a method of tracking a mobile unit in a wireless local area network. The method includes providing at least one calibration signal using a mobile unit having a first plurality of antennae while the mobile unit is proximate at least one predetermined location and receiving a plurality of signals at a second plurality of antennae in response to providing the at least one calibration signal. The method also includes determining a portion of a transmission matrix using the plurality of received signals and the at least one calibration signal and associating the portion of the transmission matrix with the predetermined location.

The present invention provides a space-time-frequency block coding apparatus and method in a transmitter with three transmit(Tx) antennas. An input symbol sequence is transmitted through three Tx antennas according to a permutation method using a selected transmission matrix in order to improve the performance of an STFBC.

The invention provides a quick image dehazing method on the basis of image textures, which includes the following steps: step I, estimating the atmospheric environment light of an input image I (x); step II, estimating the transmission matrix t (x) of the input image I (x); and step III, regaining the dehazed image as per the atmospheric environment light and the transmission matrix t (x). In the step II, according to the edge detection result of the input image, a size-changeable sliding block is used for obtaining the rough transmission matrix, namely the smaller sliding block is used for precise processing at regions where the depth of field changes suddenly, and a larger sliding block is used at regions where the depth of field changes slightly, so that the operation speed is improved. The result obtained through the changeable sliding block is more precise than that obtained through a fixed block, and the result of the rough transmission matrix can be directly used for post processing.

The invention provides a channel state information feedback method and device, and a terminal and a base station. The channel state information feedback method comprises the steps of obtaining reference information sent by the base station; obtaining a channel transmission matrix between a channel sounding reference signal SRS sending antenna of the terminal and a port corresponding to the reference information of the base station according to the reference information; obtaining a channel quality indicator CQI of the SRS sending antenna according to the channel transmission matrix when the base station is in a maximum ratio combined transmission mode; and sending the feedback information to the base station, wherein the feedback information at least comprises the CQI. According to the scheme of the method, the device, the terminal and the base station, more ports of the base station can be supported; moreover, the CQI fed back by the terminal corresponds to the antenna supporting SRS sending at the terminal side; and through adoption of the feedback mode, the power loss is reduced, and the feedback accuracy of the CQI is improved.

One or more embodiments of the invention relate to a method and a system for updating model parameters based on federated learning, the method and the system can be used for privacy data protection ina machine learning process, and the method is realized by any training member in participants; the method comprises the steps of obtaining a to-be-trained initial model with the same structure as other participants; performing model parameter iterative updating for multiple times, each iteration comprising: performing model training based on a self-held training sample to obtain a model data matrix corresponding to the current iteration; determining a transmission proportion corresponding to the current iteration, wherein the transmission proportion is in negative correlation with the numberof iterations; extracting a part of parameter elements from the model data matrix based on the transmission ratio; generating a parameter transmission matrix based on the partial parameter elements; uploading the parameter transmission matrix to the server; obtained updated model parameters from the server to perform a next iteration based thereon, or determining a final model based thereon.

The invention discloses a time-variant underwater acoustic channel capacity simulation model. The time variant underwater acoustic channel capacity simulation model comprises a storage module for storing various parameters, a reading module for reading the various parameters stored in the storage module, a large-scale module for obtaining random channel parameters subjected to large-scale transformation through first-order AR transformation, a multipath channel processing module for obtaining path information of multiple paths of the random channel parameters based on a ray tracing model, a screening module for screening out three to ten important paths, a small-scale module for calculating small-scale attenuation coefficients of multiple micro-paths according to small-scale parameters, a Doppler module for processing Doppler parameters to calculate an effective Doppler matrix, a channel transmission function generating module for obtaining a total channel transmission matrix of a multipath time delay acoustic channel according to comprehensively-obtained various parameter, and a channel capacity processing module for conducting processing transformation on channel transmission functions in the total transmission matrix and obtaining pulse response, channel gain and channel capacity of the acoustic channel through calculation.

A method for remote crosstalk cancellation, includes: the combination transmitting signal is performed a pre-coding of crosstalk cancellation in the manner of self-adapting filtering, the self-adapting changes of the values of filtering parameters are guided correctly with the influence of the crosstalk component in the received signals which is reflected indirectly by relevant values of the noise statistic reported by the receiver. A corresponding device and a signal processing system for remote crosstalk cancellation are provided. The self-adapting adjustment of the values of filtering parameters has a favorable astringency and an effect for crosstalk cancellation, avoiding the need to know the channel transmission matrix in advance, while absolutely avoiding the conflict to the existing transmission standard.