533 results about "Beam transmission" patented technology

A first wireless terminal station transmits beam transmission direction identification information in all directions. A second wireless terminal station receives the transmission direction identification information, combines reception direction identification information and the transmission direction identification information, and transmits directivity direction combination information to a wireless base station. The first and the second wireless terminal stations form directional beams in directions indicated by the directivity direction combination information to thereby perform a direct communication.

Systems and methods which implement cooperative techniques at wireless network access points to provide interference mitigation are shown. Embodiments utilize cooperative antenna beam adaptation techniques wherein antenna beam selection, selective antenna beam transmission power, and/or antenna beam null selection is implemented based upon the communication environment created by a plurality of access points. Additionally or alternatively, embodiments utilize cooperative antenna beam isolation techniques wherein narrow channel filters are implemented with respect to antenna beam signals and/or shielding is provided between various antenna beams based upon the communication environment created by a plurality of access points. Embodiments additionally or alternatively utilize cooperative antenna beam coordination techniques wherein transmission and/or reception of signals is coordinated, the use of antenna beams is coordinated, and/or interference cancellation is implemented based upon the communication environment created by a plurality of access points.

The invention provides a laser processing device and a method of the laser processing device. The laser processing device comprises a laser, a lens set, a Dove prism, a plane mirror, a focus lens and a workpiece to be processed which are all sequentially arranged in the direction of an optical axis, wherein the lens set is composed of two lenses, and the distance between the two lenses can be adjusted so that the spot sizes and the divergence angles of outgoing beams of the laser can be adjusted; the Dove lens is installed in a rotary motor and rotates with the optical axis as the center, and the beams going out from the Dove lens also rotate with the optical axis as the center; the plane mirror is used for deflecting the transmission direction of the beams; the position of the focus lens in the beam transmission direction can be adjusted, and the beams are focused on the surface of the workpiece to be processed after passing through the focus lens; the workpiece to be processed is placed on an electric displacement platform and can make two-dimensional movement in the plane perpendicular to the transmission direction of the beams.

A beamforming system synchronization architecture is proposed to allow a receiving device to synchronize to a transmitting device in time, frequency, and spatial domain in the most challenging situation with very high pathloss. A periodically configured time-frequency resource blocks in which the transmitting device uses the same beamforming weights for its control beam transmission to the receiving device. A pilot signal for each of the control beams is transmitted in each of the periodically configured time-frequency resource blocks. The same synchronization signal can be used for all stages of synchronization including initial coarse synchronization, device and beam identification, and channel estimation for data demodulation.

The invention provides a neighbor finding method for a directional Ad Hoc network. An antenna active detection/passive monitoring mode of a node is determined based on the binary coding bit of the ID of the node, a channel resource is divided into a plurality of sub-channels through the CDMA or the OFDM technology, the number of the sub-channel which is occupied by the node is determined through an equal-probability random selection method, the purpose that multiple nodes send information alternately on different channels is achieved, the data collision conflict caused by the fact that the multiple nodes send information to the same node at the same time in the neighbor finding process is effectively reduced, the success probability of finding a neighbor node can be remarkably improved, and network networking time is shortened. By the adoption of the neighbor finding method for the directional Ad Hoc network, the neighbor node can be rapidly found in the Ad Hoc network with directional beam transmission being adopted completely, and the neighbor finding method for the directional Ad Hoc network is suitable for all networking scenes with network density being large from small. The neighbor finding method for the directional Ad Hoc network is easy to achieve, the time spent in finding all the neighbor nodes within a one-hop range is short, and reliability is high.

A method of providing power beams via a network of source nodes. Source nodes are configured to receive requests for power beam service from airborne user nodes such as aircraft equipped with photovoltaic receivers. User nodes are configured to communicate a set of parameters, such as location, mobility, field of regard, one or more beam wavelengths compatible with the receiver, the beam wavelength further described with a maximum sustained power, duty cycle and pulse repetition rate. Source nodes publish parameters to a network control system. Source nodes publish their location, velocity vector, orientation, available beam capacity, and a schedule of user nodes currently receiving service from the node. Source nodes selectively receive requests from user nodes, and respond to the requests to satisfy the user node parameters. Relays may be used to avoid obstructions, and deconflicting sensors and obstruction sensors may be used detect unauthorized or unusable beam paths.

A wireless communication system includes a mobile terminal, a controller, and at least one base station. A mobile terminal has an array antenna and searches for neighbor base stations. The controller determines an active set for multi-cooperative transmission/reception with respect to the mobile terminal among searched neighbor base stations, and schedules beam transmission of each base station included in the determined active set. The at least one base station performs transmission/reception with the mobile terminal using beam-forming in an ultra high frequency band, and provides resource information regarding uplink/downlink of each base station included in the active set to the mobile terminal based on the scheduling by the controller.

The invention discloses a shaped-beam transmission method which comprises the following steps: a system sets a subframe structure for performing shaped-beam transmission, wherein, the step further comprises the sub-steps of setting previous n OFDM symbols in the subframe for purpose of transmitting a control signaling and setting the number of OFDM symbols, which are not the previous n OFDM symbols and are used by user exclusive reference signals, and frequency domain spaces of the reference signals on the same data layer, wherein, n is not less than 1 and mapping positions of the reference signals on difference data layers are not overlapped with each other; and when the system judges to perform the shaped-beam transmission, the subframe structure is dispatched to map and transmit the reference signals. The invention also discloses a shaped-beam transmission device which comprises a subframe structure setting module, a shaped-beam judging module and a mapping and transmission executing module. In the invention, the subframe structure is newly set so that the transmission of the user exclusive reference signals can be supported and the shaped-beam transmission can be performed; and meanwhile, resource consumption of the system is reduced and the method and the device are easy to be realized.

The optical fiber connector of the present invention includes a housing having a ferrule receiving passageway and a lens receiving portion which is disposed on the front end portion of this ferrule receiving passageway. A central axis is coaxial with the central axis of the ferrule receiving passageway. A spherical lens is fastened to the lens receiving portion and a ferrule is inserted into the ferrule receiving passageway from the rear side and is incorporated with an optical fiber whose front end surface is perpendicular to the central axis. A transparent block having a refractive index that is substantially the same as the refractive indices of the lens and optical fiber is disposed between the lens and the ferrule so that this block contacts the lens, the ferrule, and the optical fiber. A refractive index matching agent having a refractive index substantially the same as the refractive indices of the lens and optical fiber is applied around the contact point between the lens and the block and around the contact surface between the ferrule and the block. The thickness of the block in the direction of beam transmission is set to be the same as the distance to the focal point from the end surface of the lens.

A beam delivery system for treating target tissue that includes an input for receiving a light beam, a variable attenuator for providing variable attenuation of the light beam, a power and wavelength detection assembly, a spot size adjustment assembly, and a controller. The power and wavelength detection assembly measures the power level of the beam, and detects when unwanted wavelengths are present in the light beam. The spot size adjustment assembly selectively feeds the beam through different optical fibers to achieve different spot sizes of the beam. The controller controls the variable attenuator, the power and wavelength detection assembly, and the spot size adjustment assembly to achieve the desired power and wavelength, and beam spot size.

Using geometric characteristics of outer margin curves of two light spots at different distances along direction of beam transmission, the disclosed method obtains divergence angle of laser. Through rotational scanning detection, concentric placed two light detectors perpendicular to each other obtain outer margin curves. Multiple optical fibers are distributed on the said light detector evenly. The disclosed device is composed of drive power supply, cooling water platform, cooling water circulation system, 4D traveling platform, electrical motor set, drive, data acquisition module, and PC etc. The light-receiving module includes light detectors. The light-receiving module, data acquisition module, and PC are connected electrically. The invention solves issue of test error caused by regarding face radiation of area array laser as spot light source so as to avoid damaging and burning detector caused by too large power of laser. Advantages are: accurate and reliable.

The invention discloses a defect two-dimensional morphology imaging detection method based on multi-mode acoustic beam synthetic aperture focusing, belonging to the technical field of nondestructive testing. According to the method, a phased array ultrasonic detector, a phased array ultrasonic probe and a phased array ultrasonic detection system of an oblique wedge block are adopted; and signal acquisition of a detected test block is performed by the electronic scanning function of the phased array ultrasonic detector to obtain A-scanning signal of each aperture of the phased array ultrasonic probe. According to different mode conversion types of excitation acoustic beam of each aperture on the interface between the wedge block and test block, at the bottom of the test block and on the defect surface, proper multi-mode acoustic beam is selected from 8 acoustic beam transmission modes. Based on SAFT imaging principle and Fermat's theorem, the transmission delay of the multi-mode acoustic beam of each aperture is calculated, and amplitudes are overlapped to obtain a reconstructed SAFT image, thus realizing complete representation of defect two-dimensional morphology features. The invention can realize correct recognition of volume type and area type defects so as to realize accurate quantification of defect length, depth and orientation, and has relatively high engineering application value.

In a first configuration, the apparatus may be a base station. The base station adjusts a periodicity for performing a beam sweep, sends information indicating the adjusted periodicity for performing a beam sweep, and performs the beam sweep at the adjusted periodicity. In a second configuration, the apparatus may be a UE. The UE receives information indicating a periodicity for performing a beam sweep from a base station, adjusts the periodicity for performing the beam sweep, and performs the beam sweep at the adjusted periodicity. For both configurations, the beam sweep is a plurality of transmissions of a beam in a plurality of different transmit spatial directions by one of the base station or the UE and a plurality of scans of the beam transmissions in a plurality of different scan spatial directions by another of the one of the base station or the UE.

According to an aspect of the present invention, an apparatus for controlling signal transmission and/or reception in a radio communication system is disclosed, which includes: Transceiver devices (TX, RX), wherein at least one of said transceiver devices (TX, RX) is additionally connected to a calibration antenna for sending to and/or from said antenna elements (#1...# n) transmit and/or receive test signals; at least one calibration processor for determining variations of said test signals within said transceiver device (TX, RX); and a beamforming processor for converting the determined The variation of takes into account the beamforming and/or the determination of the direction of arrival for the radio signals transmitted and received by said antenna elements (#1...#n), respectively.

A system and method of implementing an on-demand change of the RF power class of multi-carrier power amplifiers at a base station radio with minimal disruption of user service is disclosed. The power amplifiers providing signal diversity at said cell site and being able to operate at various RF power class levels. A first multi-carrier power amplifier with multiple RF Power Classes provides a main RF beam transmission at one sector of said cell site. A second multi-carrier power amplifier with multiple RF Power Classes provides RF beam transmission diversity to the main RF beam transmission. A switch operates to disable either the first or second multi-carrier power amplifier when an RF Power class change is required.

An incremental scheduling scheme is proposed in a wireless communication system with beamforming. In an initial stage (stage-1), coarse scheduling plan is granted via control beam transmission. In a second stage (stage-2), fine scheduling plan is granted via dedicated beam transmission. Such incremental scheduling scheme provides load balancing for overhead channels on control/dedicated beams via stage-2 scheduling. It utilizes dedicated beam transmission that is more resource efficient and more UE-specific. Furthermore, it provides UE natural power-saving opportunities via stage-1 scheduling.

The invention provides a scanning microscope comprising: optical fiber for transmitting a light beam to an exit end of the optical fiber proximate light focusing optics, the light focusing optics focusing the light emerging from the exit end to illuminate a point observation field on or within an object to be examined; and a scanner mounted in an optical head casing with the light focusing optics, to cause the illuminated point observation filed to scan over a two-dimensional cross-section of the object such that an image of the object emanated light over the cross-section is constructible. The scanner comprises a forwardly extending vibratable member and a counterbalance coupled thereto, the point observational field is forward the vibratable member, the vibratable member is coupled to the exit end of the optical fiber to provide the fast scan, the counterbalances reactive forces associated with vibration of the vibratable member and the exit end of the optical fiber during operation, and the light focusing optics is mounted in the optical head casing separately from the vibratable member whereby the light emanating from the exit end of the optical fiber is, during operation, scanned across the light focusing optics.

The invention discloses a beam shaping illumination system of a semiconductor laser array, which comprises the semiconductor laser array, an optical system for transforming beam divergence angles of a fast axis, a device for deflecting angles of beams in the fast axis direction, and an optical system for transforming divergence angles of a slow axis and deflecting the beams in the slow axis direction. The system has a key point that the superposition effect of Gaussian beam parts of a plurality of laser units is formed in a distant field by controlling the deflection degree of beam transmission axes of each laser unit in the fast axis and slow axis directions respectively so as to construct illumination beams according with field coverage requirements. The system has the characteristics of high efficiency, simple structure, low cost, integration and practicability, and is particularly applicable as an illumination light source of area array imaging laser radar and active laser illumination detecting systems.

A system for re-using GEO-allocated communications spectrum in a LEO satellite constellation based communications system, such that the LEO satellite originated signals will not appear in the beam-width of GEO-pointed earth station antennas, and satellites configured to provide communications by manipulating their respective beam transmissions, which may include a forward beam and rearward beam whose angles are controlled to project the beam and reduce or eliminate the potential for interference with GEO-pointed earth station antennas. The system and LEO satellites may provide substantially 100% coverage of an earth station located anywhere on the surface of the earth, without coordination with the GEO satellites or GEO-pointing ground stations. The system also may provide earth stations that are configured to enhance the isolation between the GEO communications system and the LEO communications system using the same spectrum to reduce the potential for GEO-pointed earth station antennas from picking up the LEO communication.