56 results about "Base station antenna array" patented technology

A method for downlink beamforming in a frequency-division-duplex wireless communications system comprising a base station with an antenna array and terminals that are physically remote from said base station, the method comprising the steps of: receiving at said base station antenna array combinations of arriving uplink signals from said plurality of remote terminals, estimating an uplink beamforming weight vector for each of said terminals from said combinations of arriving uplink signal; identifying uplink nulls and an uplink main beam position from said uplink beamforming weight vector; transforming each of said uplink nulls to form a corresponding downlink null; generating a downlink beamforming weight vector from all downlink nulls; and transmitting a set of information signals from said base station antenna array according to said downlink. beamforming weights.

A method is disclosed for operating a synchronous space division multiple access, code division multiple access communications system, as is a system that operates in accordance with the method. The method operates, within a coverage area of a base station (BS), to assign the same spreading code to a plurality of subscriber stations (SSs) and to transmitting signals to, and receive signals from, the SSs using an antenna array having M elements, where M>1 and where the M elements are spaced apart by more than one-half wavelength from one another. The spacing is a function of a size of an aperture of the antenna array which is a function of a signal bandwidth to carrier frequency ratio. The antenna array aperture is preferably less than k=p/360*fc/B wavelengths, where p is a maximum acceptable phase variation over the signal bandwidth, where fc is the carrier frequency and where B is the signal bandwidth. The step of conducting communications includes steps of despreading a plurality of received signals; and beamforming the plurality of despread received signals. In a preferred embodiment individual ones of P orthogonal spreading codes are reused αM times within the coverage area, where 1/M<α≦1.

The invention relates to a method and a base station of a radio system implementing the method and to an antenna array of the base station which enable both antenna diversity and beam forming using the same antenna array. In the solution described the antenna array comprises, in addition to a linear part configured for beam forming, a non-linear part which is used for forming diversity. Furthermore, the non-linear part enlarges the aperture of the antenna array, thus improving the quality of beam forming.

The invention relates to a 5G base station oriented antenna array based on an integrated design of an antenna array and a power-dividing feeding network, which solves the defect that the performance of a dual-polarized 5G base station antenna array fails to meet the practical requirement compared with the prior art. An antenna array radiation component comprises a metal grounding plate printed onthe upper surface of a microwave dielectric substrate, antenna units penetrate through the metal grounding plate and are embedded on the microwave dielectric substrate, and the number of the antenna units is four. According to the antenna array, conventional electromagnetic dipoles are replaced by inverted-L-shaped radiation copper plates so that the impedance bandwidth of the antenna units is improved; besides, a conventional metal copper floor is replaced by the microwave dielectric substrate, and the power-dividing feeding network is printed on the microwave dielectric substrate to replacea conventional coaxial cable feeding network so that the size of the antenna array is reduced, the antenna array is more easily assembled, debugged and integrated, and an EBG structure with a decoupling effect is coated in the same plane of the power-dividing feeding network so that the isolation degree of the array is further improved.

The invention discloses a dual-polarization dielectric antenna and a base station antenna array thereof. The dual-polarization dielectric antenna is used for radiating electromagnetic waves to space and receiving the electromagnetic waves from the space, the antenna comprises a grounded base plate and a dielectric resonator arranged on the grounded base plate, and a crossed feed structure enveloped by the dielectric resonator, wherein the crossed feed structure performs feeding through a differential feed network, and the differential feed network is arranged on the back of the grounded base plate; when the dielectric resonator and the crossed feed structure are simulated through electric signals of the differential feed network, a combination of the dielectric resonator and the crossed feed structure is set to mainly radiate the electromagnetic signals related to the electric signals right above the grounded base plate in a unidirectional mode. The dual-polarization dielectric antennaprovided by the invention has high radiation front-to-rear ratio, is simple in structure, convenient to mount and very suitable for application of a large-scale antenna array, and has very high commercial application foreground.

A method for real-time calibration of an air to ground two-way communication system. The method includes calibrating a ground base station antenna array according to forward link calibration coefficients received from an aircraft as part of a communication signaling protocol during operation of the air to ground two-way communication system. The method may also includes communicating between the ground base station antenna array and the aircraft over a narrow beam.

The invention discloses a dual-polarization micro-base-station MIMO antenna unit, and relates to the technical field of an antenna. The dual-polarization micro-base-station MIMO antenna unit comprises an antenna unit, an isolation wall and a dual-polarization compact type micro-base-station antenna array; the antenna unit comprises a feed plate and a radiation plate; the isolation wall comprises a third dielectric plate and periodically-arranged frequency selection surface (FSS) isolation units; and the dual-polarization compact type micro-base-station antenna array comprises the antenna unit and the isolation wall. Compared with the prior art, the problems of low miniaturization degree, incapability of satisfying broadband frequency requirement and low isolation degree of the micro-base-station antenna can be solved.

A method and apparatus for communication between a wireless base station and a population of one or more terminals are provided, involving, in each of a plurality of iterations, transmitting a block of forward-link data from an array of multiple base station antennas to the terminal population. In each iteration, a forward-link power level is updated for each said terminal using a distributed algorithm and purely local information. Meanwhile, a set of beamforming coefficients based on channel state information (CSI) obtained from reverse-link pilot signals is periodically updated, and each data block is precoded with the most recently updated beamforming coefficients. Each data block is transmitted at the most recently updated forward-link power levels.

The invention discloses a method for designing three-dimensional beam forming in a multi-user 3D-MIMO system. The method comprises the following steps that first, the probability density function of the vertex angles from a base station to user direct vision diameters is calculated according to a distribution model of users in a 3D scene, and a multi-user scheduling algorithm in the multi-user 3D-MIMO system is designed according to the probability density function of the vertex angles; second, when the base station sends signals to the users, each antenna port in a configured planar antenna array serves one individual user, precodes applied to all the antenna ports are precodes suggested in the 3GPP standard, and the served users are selected from all the users through the multi-user scheduling algorithm; third, configuration of the planar antenna array of the base station is decided by the designed multi-user scheduling algorithm, an electronic downward inclination angle used in each precode applied to the corresponding antenna port is decided by the adopted configuration of the planar antenna array, and the throughput of the system is maximized finally. The method greatly improves the overall performance of the 3D-MIMO system.

This invention is a system polarization base station antenna anti interference arrangement method that base stations do not communicate with each other but to the third station of a mobile, PHS wireless city call. In the anti interference field that a antennaí»s emission and another í»receive are co-frequency or adjacent frequency, the antennas that emit or receive signals are vertical polarization and horizontal polarization antennas. Stations that may interfere with each other emit different polarized wave, one is vertical polarization and the other is horizontal polarization, and the two waves can not interfere each other, so the interference problem is solved radically. Cell phones can receive horizontal and vertical polarization waves, and cell phones signal can also be received by horizontal and vertical polarization waves. So the utility factor of frequency resources is raised.

Aspects of the present disclosure may be directed to a reconfigurable antenna system including a reconfigurable antenna capable of providing various types of radiation patterns without having to be replaced or needing its orientation changed. The reconfigurable antenna may create various types of quasi-omni directional radiation patterns of different shapes depending on the environment.

The invention provides a method for selecting an adaptive beam-forming mode under a large-scale MIMO (Multiple-Input Multiple-Output) system. The method comprises the following steps: selecting a channel model and acquiring base station antenna array parameters, including the quantity of antennas and the arrangement way of an antenna array; representing the system average throughputs of two users in a single beam-forming mode and a dual beam-forming mode as the functions of the azimuth angles of the two users respectively in combination with the base station antenna array parameters and the channel model; calculating the difference between the azimuth angles of the two users when the system average throughputs in the single beam-forming mode and the dual beam-forming mode are equal to each other, and marking the difference as an azimuth angle threshold value; and adopting the dual beam-forming mode for the two users whose difference between the azimuth angles is greater than the azimuth angle threshold value, and adopting the single beam-forming mode for the two users whose difference between the azimuth angles is smaller than the azimuth angle threshold value. Adaptive selection of the beam-forming mode according to the user position can be realized in order to maximize the system throughput.

The invention discloses a broadband dual-polarization filtering base station antenna unit, a base station antenna array and a communication device, the antenna unit comprising four dipole arms, four parasitic branches and a feed structure, wherein two of the dipole arms are arranged oppositely, the other two dipoles are also arranged oppositely, the four dipole arms correspond to the four parasitic branches respectively, each dipole arm is coupled to a corresponding parasitic branch, the feed structure is connected with the four dipole arms; the antenna array comprising at least two antenna units described above; the communication device comprising the antenna unit described above, or comprising the antenna array described above. Not only the radiation performance of the present invention may achieve high roll-off filtering characteristics and high polarization isolation, but also to a great extent ensuring that no introduction of additional insertion loss and occupied area caused by redundant structures, and the bandwidth may be expanded, the height reduced, and a stable pattern in a wide frequency band is achieved.

The invention discloses a branch loading and parasitic structure loading-based small-size base station antenna unit. The branch loading and parasitic structure loading-based small-size base station antenna unit comprises a radiation patch, angular metal structures, a parasitic ring structure, a microstrip feeder, a coaxial feeder, short-circuit metal, a reflection plate, three different dielectricplates and a feeding floor, wherein the four angular metal structures are respectively arranged at tail ends of four dipole arms, the parasitic ring structure is arranged right below the radiation patch, and the reflection plate comprises a horizontal structure and metal baffle plates around the horizontal structure. By loading the angular metal posts at the tail ends of the dipole arms and loading the metal ring structure below the radiation patch, the size of the radiation patch is reduced by 25%, the impedance matching is good, and the radiation performance is stable; and with a structurethat the feeding floor and the reflection plate are separated, the antenna is flexible to assemble, and the antenna is suitable for mass production. The antenna can be applied to a base station antenna array under a limited space size condition.

The invention belongs to the technical field of base station antenna arrays, and discloses a high-isolation 5G base station antenna and a wireless communication terminal. A metal floor is fixedly provided with a first layer of periodically arranged patch structure and a second layer of periodically arranged patch structure through dielectric studs; periodically arranged square patches are arranged on each layer of periodically arranged patch structure; the first layer of periodically arranged patch structure and the second layer of periodically arranged patch structure are located on the antenna units, and a metal isolation wall is arranged between the antenna unit linear arrays and is fixed on the metal floor through screws. According to the antenna array, the slotted metal isolation wall and the two layers of periodically arranged patch structures are loaded on the antenna array, so that the isolation degree between the antenna array units of the 5G base station is greatly improved, and the antenna array can be applied to a 5G communication system.