Nec Corporation

Masashi Hirabe

Tsuguo Maru

Tetsuo Yama

Kosuke Tanabe

Hiroki Takeda

An antenna device according to the present disclosure includes a first antenna that is oriented in a first direction and transmits and receives a signal with a first polarization, a second antenna that is oriented in a second direction opposite to the first direction, a third antenna that is oriented in a third direction obtained by horizontally rotating the second direction by 90° or 180° and transmits and receives a signal with a second polarization orthogonal to the first polarization, a fourth antenna that is oriented in a fourth direction opposite to the third direction and transmits and receives a signal with the second polarization. The second antenna is provided with a feeding point placed in phase with a feeding point of the first antenna. The fourth antenna is provided with a feeding point placed in opposite phase to a feeding point of the third antenna.

Antenna device and communication method

A calibration control apparatus () includes a receiving-side correction coefficient calculation unit () that calculates a receiving-side correction coefficient for calibrating a characteristic difference between reception units () based on a propagation path estimation matrix which has, as a matrix element, a propagation path estimation value of each propagation path from transmission units to reception units () in a plurality of transmission units of an OAM mode multiplex transmission apparatus and a plurality of reception units () of an OAM mode multiplex reception apparatus ().

Calibration control apparatus, calibration control method, non-transitory computer readable medium, and calibration system

In a transmitting-side control apparatus (), a transmission control unit () controls a radiator () to transmit an OAM known signal formed by one common OAM transmission mode at each of transmitting-side relative position candidates. An acquisition unit () acquires a feedback signal including information about a use transmitting-side relative position based on a reception strength of the OAM known signal transmitted under the control of the transmission control unit (). An adjustment unit () adjusts a relative position between the radiator () and a focal point of a reflecting mirror () to the use transmitting-side relative position indicated by the information included in the feedback signal.

Control apparatus, OAM transmission apparatus, OAM reception apparatus, control method, non-transitory computer-readable medium, and control system

An antenna device according to the present disclosure includes a first antenna that is oriented in a first direction and transmits and receives a signal with a first polarization, a second antenna that is oriented in a second direction opposite to the first direction and transmits and receives a signal with the first polarization, a third antenna that is oriented in a third direction and transmits and receives a signal with a second polarization, a fourth antenna that is oriented in a fourth direction opposite to the third direction and transmits and receives a signal with the second polarization. The second antenna is provided with a feeding point placed in phase with a feeding point of the first antenna. The fourth antenna is provided with a feeding point placed in opposite phase to a feeding point of the third antenna.

Communication device and communication method

The present invention is a radio signal transmitting antenna () including a first wave source () including a plurality of antenna elements (Ato AN) configured to form a first helical beam (H) for OAM (Orbital Angular Momentum) from the plurality of antenna elements (Ato AN) and output the first helical beam (H) and a second wave source () configured to receive the first helical beam (H) and form a second helical beam (L) output in a constant direction and transmits the second helical beam (L). The radio signal transmitting antenna () can transmit a helical beam (L) for OAM with a simplified and smaller device configuration.

Radio signal transmitting antenna, radio signal receiving antenna, radio signal transmission/reception system, radio signal transmitting meithod, and radio signal receiving method

According to the present invention, when wireless communication is performed, a signal can be formed into a spiral beam (H), the spiral pitch of the signal can be changed, and a plurality of spiral beams (H) with different spiral pitches can be transmitted and received. The present invention pertains to a wireless signal transmitting antenna () including a signal emitting means (A) having N number of antenna elements (A, . . . , AN) (where N is an integer satisfying N&#x2265;2) equally spaced on a circumference of circle, and a signal distribution means (B) for generating, from an input first signal (S), N number of second signals (G, . . . , GN) having a phase difference from one another and outputting the N number of second signals (G, . . . , GN) to the N number of antenna elements (A, . . . , AN), respectively, so that a spiral beam (H) with the equiphase surface inclined spirally is output from the signal emitting means (A).

Wireless signal transmitting antenna, wireless signal receiving antenna, wireless signal transmitting system, wireless signal transmitting method, and wireless signal receiving method

A radome () includes a first region (A) and a second region (B) having different radio-wave transmission characteristics from each other, and is configured to form a null pattern in substantially a front direction of an antenna by superimposing a first radio wave that has passed through the first region (A) and a second radio wave that has passed through the second region (B).

Radome and pattern forming method

Radio signal transmitting antenna, radio signal receiving antenna, radio signal transmission/reception system, radio signal transmitting method, and radio signal receiving method

When wireless communication is performed, a signal can be formed into a spiral beam (H), the spiral pitch of the signal can be changed, and a plurality of spiral beams (H) with different spiral pitches can be transmitted and received. A wireless signal transmitting antenna () includes a signal emitting means (A) having N number of antenna elements (A, . . . , AN) (where N is an integer satisfying N&#x2265;2) equally spaced on a circumference of circle, and a signal distribution means (B) for generating, from an input first signal (S), N number of second signals (G, . . . , GN) having a phase difference from one another and outputting the N number of second signals (G, . . . , GN) to the N number of antenna elements (A, . . . , AN), respectively, so that a spiral beam (H) with the equiphase surface inclined spirally is output from the signal emitting means (A).

An antenna orientation adjustment assistance device that allows any worker to quickly and accurately install an antenna device is provided. An antenna device () is temporarily installed. Further, a camera () is mounted on the antenna device (). Then, the antenna orientation adjustment assistance device includes a reception strength detection unit () that detects a reception strength of radio waves received by an antenna unit (), a position calculation unit () that calculates a relative angle position of the antenna unit () by using an image taken by a camera () fixed relative to the antenna unit (), and a reception strength recording unit () that records the relative angle position of the antenna unit () and the reception strength at the relative angle position in association with each other.

Antenna orientation adjustment assistance device and antenna device installation method

An antenna orientation adjustment device () include a camera (), nut runners (and), and a motion controller (). The nut runners (and) can be mounted on an azimuth adjustment bolt () and an elevation adjustment bolt (), respectively. The nut runners (and) change the orientation of an antenna unit by applying motor power to the azimuth adjustment bolt () and the elevation adjustment bolt (). The motion controller () calculates an angle position of the antenna unit () where a reception strength is maximum based on an image taken by the camera () and a reception strength of radio waves received by the antenna unit (), and then adjusts the antenna unit () to the angle position where the reception strength is maximum by supplying a drive signal to the azimuth adjustment bolt () and the elevation adjustment bolt ().

Antenna orientation adjustment device and antenna orientation adjustment method

The antenna device includes an antenna unit () mounted so that its direction is adjustable, a motor-driven unit () that changes a direction of the antenna unit (), a camera () fixed so that its direction relative to the antenna unit () does not change, and a direction adjustment control unit () that supplies a drive signal to the motor-driven unit () and adjusts the direction of the antenna unit (). The direction adjustment control unit () performs feedback control to return the direction of the antenna unit () back to an initial direction based on an image taken by the camera (). It is thereby possible to maintain the communication quality even when a mechanical vibration occurs in a structure on which an antenna device is mounted.

Antenna device and control method of antenna device

The base station includes: a first combiner which weights the BB signals received by first and second antenna elements by first and second weight coefficients and adds them; a second combiner which weights the BB signals received by third and fourth antenna elements by first and second weight coefficients and adds them; a third combiner which weights the BB signals added by the first and second combiners by third and fourth weight coefficients and adds them; a first processor which calculates such first and second weight coefficients that a combined polarization of the received signals of each antenna is orthogonal to a polarization of an interfering signal existing in the same direction as a desired signal; and a second processor which calculates such third and fourth coefficients that a null is formed in a direction different from the desired signal and in which an interfering signal exists.

Mobile communication system, base station and interference cancellation method

A base station of the present invention includes: first and second antenna elements that have polarization characteristics orthogonal to each other; a first converter that converts a received signal of the first antenna element into a baseband signal; a first multiplier that weights the baseband signal converted by the first converter by multiplying a first weight coefficient; a second converter that converts a received signal of the second antenna element into a baseband signal; a second multiplier that weights the baseband signal converted by the second converter by multiplying a second weight coefficient; an adder that adds the baseband signals weighted by the first and second multipliers and outputs the sum; and, a signal processor that calculates the first and second coefficients by MMSE such that the combined polarization of the received signals of the first and second antenna elements will be orthogonal to the polarization of an interference signal.

Growing community of inventors

Tokyo, Japan

Masashi Hirabe