50 results about "Angle of departure" patented technology

The invention discloses a time-varying channel estimation method for a millimeter wave multi-user MIMO system. Based on the sparse characteristics of a millimeter wave channel in an angle domain, a channel estimation method based on compressed sensing is adopted. The method comprises the following steps: (1) modeling a time-varying millimeter wave channel; (2) quantitatively expressing the millimeter wave channel; (3) modeling a time-varying millimeter wave channel estimation problem as a compressed sensing mode; (4) recovering the estimated number of paths, angles of arrival and angles of departure by using a modified block orthogonal matching pursuit (R-BOMP) algorithm; (5) designing an analog precoding matrix and a digital precoding matrix based on the estimated number of paths and angles of arrival; (6) designing an analog merge vector based on the estimated number of paths and angles of departure; and (7) solving a millimeter wave channel matrix based on the number of paths, the angles of arrival and the angles of departure that are estimated as well as the analog precoding matrix, the digital precoding matrix and the analog merge vector that are designed. By adopting the time-varying channel estimation method disclosed by the invention, the accuracy and spectrum efficiency of the millimeter wave channel estimation can be improved.

The invention discloses an estimating method of direction of arrival of a bistatic MIMO (Multi-Input Multi-Output) radar based on a circular array, and mainly solves the problems that in the prior art, calculation is large and the direction of arrival of the circular array cannot be estimated. The realizing process comprises the steps of: 1, obtaining a cut-off Fourier coefficient of a steering vector of the array, and replacing the steering vector by the product of the Fourier coefficient and a base; 2, performing matched filtering for received data by the array to form an autocorrelation matrix and performing characteristic-decomposition for the matrix; 3, selecting a characteristic vector to form a noise sub space and obtaining a spatial zero-spectral function; 4, introducing the steering vector received to the spatial zero-spectral function, and solving an acceptance angle by polynomial rooting; and 5, introducing the acceptance angle received to the spatial zero-spectral function and solving an angle of departure by polynomial rooting. According to the estimating method of direction of arrival of the bistatic MIMO radar based on the circular array, the polynomial rooting method can be adopted to estimate the direction of arrival of the manifold MIMO radar of the circular array, spectrum peak search is avoided, calculation is low, and the estimating method of direction of arrival of the bistatic MIMO radar based on the circular array can be applied to estimating the direction of arrival of the bistatic MIMO radar.

Devices and methods of estimating the AoD of a STA are generally described. The STA receives and stores an association between tone and transmission angle for each tone transmitted by an AP in different angles. The association indicates that, for each angle, a tone transmitted in the angle is unique. The STA detects a symbol transmitted on each tone, determines the strength and timing of the tone and estimates the AoD based on the association and either or both the strength and timing. Each tone may have multiple symbols and/or each angle multiple tones whose characteristics are averaged to determine the appropriate characteristic of the particular tone or angle. The position of the STA is calculated from the AoD of one or more APs.

Systems and methods for scheduling transmissions from multi-beam transmitters to sets of receivers are provided. An angle of departure is determined for each of the receivers, and the transmissions to the receivers is then scheduled on the basis of the separation between the angles of departure between the receivers. For example, a constraint may be imposed that no two receivers having an angle of departure separated by less than a first minimum will be scheduled during an even scheduling interfold. Some implementations include a prioritized scheduling system in which high priority receivers are scheduled according to a performance metric subject to the angle departure constraint, and subsequently low priority receivers as scheduled only subject to the angle departure constraint.

The invention discloses an angle of arrival determination method, an angle of departure determination method, and a communication device. The angle of arrival determination method comprises the following steps: firstly receiving a carrier signal sent by emitting end equipment by receiving end equipment through multiple antennas, and then generating a baseband signal according to the carrier signal, and then sampling phase information of the waveforms of the multiple antenna at sampling points corresponding to different sampling moments from the baseband signal, and determining n phase values of each antenna of the multiple antennas, wherein the receiving end equipment averages the phase value weight of each antenna to obtain the phase average value of each antenna; and finally, computing the angle of arrival of the carrier signal according to the phase average value of each antenna, thereby improving the computation result precision of the angle of arrival.

The invention discloses a method, namely an SLS-ESPRIT (structure least square-estimating signal parameters via rotational invariance techniques) algorithm, for joint estimating angle of departure (DOD) to angle of arrival (DOA) of a target in a MIMO (multiple input multiple output) radar system on the basis of an SLS method. Estimation accuracy of signal subspace is improved by solving rotational invariance equation by the aid of the SLS and iterating estimation error of minimized signal subspace, and angle estimation performance is enhanced. In addition, effectiveness of the estimation method is testified through simulation results.

The invention discloses a portable device, a beacon and a navigation system which are used for realizing a portable indoor navigation device and system. The portable device provided by the invention comprises a positioning module and a processor module, wherein the positioning module is used for receiving a broadcast packet transmitted by the beacon and positioning the portable device by using thebroadcast packet and adopting an angle of arrival (AOA) or angle of departure (AOD) technology; and the processor module is used for sending a navigation instruction according to a positioning resultof the positioning module.

A method for operating a first station adapted for directional peer to peer communications includes obtaining geometry information associated with a second station, and establishing a directional peer-to-peer link with the second station using a first transmission beamformed in accordance with an angle of departure for the second station, wherein the angle of departure is associated with the geometry information.

A firearm apparatus and a method of firing ammunition therefrom, where the method utilizes a barrel (12) having a breech end surface (40) and immovably affixed to frame (10), a stand pressure surface (32), and a cartridge container (16) with a cartridge case (26) therein and countermass main body (18) movable in opposite directions. Gas from a deflagrating propellant moves the movable members and applies directionally opposite forces upon the breech end surface (40) and the stand pressure surface (32), which results in the force cancellation and ensures that the barrel (12) remains stable during firing. This solves the problem of the angle of departure and contributes to a high accuracy of shooting.

In some aspects, the disclosure is directed to methods and systems for virtual angle-of-arrival (AoA) or angle-of-departure (AoD) tracking for virtually tracking multiple Targets. The wireless devices (e.g. Tracker and Targets) may participate in a mesh configuration and share data within the mesh. A first device may purport to be a virtual tracker, while acting as an AoA or Angle of Departure (AoD) Target. The devices being tracked (e.g. virtual targets), may instead operate as Trackers. Processor- and energy-intensive calculations may be distributed to the virtual targets and transmitted via the mesh for aggregation at the virtual tracker.

Method, apparatus, and computer program product example embodiments provide secure distance estimation based on direction measurement. According to an example embodiment of the invention, a method comprises receiving, by an apparatus (102) from a remote device (100), one or more wireless packets including information packets containing angle of departure information (160) of the remote device (100); determining in the apparatus (102), a first angle of departure and a second angle of departure from the received angle of departure information; and generating distance estimation data in the apparatus relative to the remote device (100), based on the determined first angle of departure and second angle of departure.

The invention is a method for preparing X-rays in the material analysis test area of technology X beam diffraction sample manufacture method, the step follows: (1) choice of material; Sample choice monocrystal material, use crystal analyzer and laue diffraction technology determination monocrystal dense platoon crystallography plane; (2) cuts monocrystal sample semifinished materials, with the unit crystal dense platoon crystallography surface angle of departure, cuts the monocrystal piece as well as sample semifinished materials; (3) chemistry corrosion sample place; Using the hydrofluoric acid solution, corrodes the sample semifinished materials surface, corrodes the pit, at the same time uses the isolation material polyethylene, the region and the etching solution isolates the sample place outside; (4) but crystal sample and tinsel caking; Using the epoxy resin, and the tinsel carries on compound the monocrystal sample, obtains X beam diffraction sample frame, uses in X beam diffraction system, to was measured the sample diffraction information does not have any disturbance, enhances the measurement result the reliability, overcomes the easy embrittlement the shortcoming, lengthens the service life.

The invention discloses a low-feedback precoding and reception merging combined method of a large-scale antenna array system. The method comprises the following steps that user equipment estimates wireless channel parameters including channel gains in all spreading paths and response vectors of emission and reception arrays from the user equipment to a base station; an angle of departure and an angle of arrival corresponding to the path with the maximal channel gain are captured and back fed to the base station; the base station generates the response vector of the emission array according tothe angle of departure, analog precoding is carried out on a sending signal, the base station further calculates an equivalent channel, and digital precoding is realized; and the user equipment generates the response vector of the reception array according to the angle of arrival, and analog reception merging is carried out on the reception signal. The method is applied to the practical large-scale antenna array system, digital and analog mixed signal processing is realized with low power consumption and low cost, and the spectral efficiency approaching that of a fully digital signal processing method can be realized effectively.

Cutting elements include an ultra-hard body, e.g., comprising diamond, that is attached to substrate, e.g., comprising a cermet. An interface exists between the body and the substrate, and an angle of departure as measured between the interface and a free edge of the cutting element within one or both of the body and substrate, is less than about 90 degrees to provide a desired stress reduction along the interface. The angle of departure can be from about 3 to 87 degrees. The desired reduced angle of departure is provided by a surface feature disposed along an outer side surface of the cutting element adjacent a free edge of the interface. The surface feature can in the form of a groove disposed circumferentially around the body and/or substrate outer side surface, that is configured to provide the desired reduced angle of departure within the body and/or substrate.

This invention supplies a back light module, which at least concludes one illuminant and one light guide plate. This light guide plate has a light-entry surface and a light-outward surface that next to the light-entry surface. This back light module also concludes at least a multireflection device that can make light beam emitted by the illuminant couple to beam path of light-entry surface. Through this reflection device, the angle of departure of illuminant is enlarged. This can slake the dark band that is generated when light enter into light guide plate. This can increase luminance of the back light module and make the structure simplify.

An ultra-wideband (“UWB”) communication system comprising a transmitter having two transmit antennas and a receiver having a single receive antenna. Respective selected portions of the UWB signal are transmitted by the transmitter via each of transmit antennas is received at the receive antenna. By comparing the phases of the received signal portions, the phase difference of departure can be determined. From this phase difference and the known distance, d, between the transmit antennas, the Cartesian (x, y) location of the transmitter relative to the receiver can be directly determined.

The invention discloses an angle of departure (AoD) positioning method and device, a computer readable memory medium and a terminal. The method comprises the following steps of: receiving AoD signalsof a plurality of transmitters; judging whether the transmitter is a valid transmitter or not according to propagation link quality of the AoD signal of each transmitter; and carrying out AoD positioning according to the AoD signal of the valid transmitter. According to the scheme provided by the invention, the transmitters with serious interference can be filtered and the AoD positioning is onlycarried out based on the valid transmitters, so the positioning accuracy is improved, and computing quantity of a receiver in an AoD positioning process is reduced.

The invention provides a backlight module and a display device. The backlight module comprises a light-emitting element and a light guide plate; multiple light guide slot regions are arranged at one side, close to the light-emitting element, of a reflecting plane of the light guide plate, each light guide slot region comprises multiple light guide slots, and a positive projection of each light guide slot on the reflective plane is arc, and a bending direction of the arc is towards the light-emitting element; a light ray emitted towards an in-light surface of the light guide plate by the light-emitting element is reflected to an out-light surface of the light guide plate through the light guide slots. An angle of departure of the light ray of the light-emitting element after entering the light guide plate can be increased, a dark area and light mixing distance of the light-emitting element are reduced, thereby reducing lower black edge size of the backlight module, and then reducing thelower black edge size of the entire display device, and realizing lower narrow edge design of the display device; furthermore, the thickness of the light guide plate can be reduced on the basis of guaranteeing that all light rays enter the light guide plate, and the thinner and lighter design is realized.

The invention provides a light conducting plate for liquid crystal display device, which comprises a substrate and a plurality of transparent particles, wherein the substrate includes a surface having trench arrays, the transparent particles are adhered onto the surface through a glue layer. The light conducting board has high utilization rate of light, and can effectively control the angle of departure for the light rays. The invention also provides the method of making the light conducting board.

The invention discloses a channel parameter determining method and a channel parameter determining device. The method comprises the following steps of: determining time delay tau, power P, angle of arrival (AOA) and angle of departure (AOD) of each radius of a channel, and presetting a number threshold value, a time delay threshold value range and an angle threshold value range of a light of sight (LOS) radius; when the number of the radii of the channel is not smaller than the number threshold value, selecting alternative LOS radii, the time delay tau of which is in the time delay threshold value range and the AOA and the AOD of which are in the angle threshold value range; and traversing and searching each alternative LOS radius according to the preset search angle range delta theta, calculating the power sums of the alternative LOS radii in the corresponding search angle range during searching every time, selecting the maximum power sum from all the calculated power sums, dividing the power sum of all the radii beyond the corresponding angle range corresponding to the maximum power sum by the maximum power sum, and determining the obtained value as the value of a Reiss factor K. The method and the device can improve the accuracy of channel parameters.

The invention discloses a shallow underwater acoustic channel model establishment and calculation method, mainly including the following steps: step 1, proposing a geometric model consistent with an actual situation; step 2, proposing a reference model for mathematical analysis, deriving a time-varying channel impulse response of a fading channel reference model, and further deriving a probabilitydensity function of an angle of departure and an angle of arrival as well as an expression of the UWA channel model propagation time and frequency delay; step 3, establishing an SOC random channel simulation model for experimental simulation based on the reference model, and proposing an equal-area scattering method to parameterize the channel simulation model; step 4, adopting a traditional Lp standard method to parameterize the simulation channel model, and comparing the performance of the two methods; and step 5, obtaining a theoretical result, and performing analysis. According to the shallow underwater acoustic channel model establishment and calculation method disclosed by the invention, an MESS parameterization method is adopted, the method is relatively simple in parameter calculation, a function closure analytic expression can be obtained, and compared with the traditional Lp method, the numerical precision is also accurate and efficient.

There is disclosed a fuel injector, in which, on the orifice plate are distributed a plurality of orifices divided into several groups. Each group of orifices feeds the fuel for one corresponding air intake valve. By means of the design aimed at angles of departure, deviation and atomizer cone and using a multiple orifice zoning injection fuel-feeding method, the fuel is injected into the mouth of the corresponding air intake valve separately, so that the burning and running efficiency of engines has greatly raised.