Abstract: A millimeter-wave controller receives, from a microwave-communication control apparatus belonging to a microwave network, a first signal including location information of a first terminal belonging thereto and a use request for the first terminal to use the millimeter-wave network. A beam range for the first terminal and a first wireless resource that is included in one or more wireless resources of one or more millimeter-wave access points and that is to be allocated to the first terminal are set based on the location information. A use permission for the millimeter-wave network and first connection information for connection to a first millimeter-wave access point corresponding to the first wireless resource are transmitted to the microwave-communication control apparatus.

Abstract: A transmission device transmits multiplexed signals obtained by multiplexing signals of N systems corresponding to N Orbital Angular Momentum (OAM) propagation modes. The transmission device includes: an array antenna that includes M antenna elements disposed in a lattice on a plane when viewed from the plane; and a transmitter that multiplies signals obtained by branching each of the signals of N systems into M signals by weighting coefficients of phase shift angles based on angles of the respective M antenna elements with respect to a reference axis passing through a reference point viewed from the reference point on the plane according to the OAM propagation modes, multiplexes the signals of N systems multiplied by the weighting coefficients of the phase shift angles, and transmits signals obtained by the multiplexing from the M antenna elements. M and N are integers equal to or larger than 2.

Abstract: A transmission device includes: a modulator that selects an Orbital Angular Momentum (OAM) propagation mode among N (N is an integer equal to or greater than 2) OAM propagation modes in accordance with a value of bit data to be transmitted; and a transmitter that transmits a signal of the OAM propagation mode selected by the modulator.

Abstract: A wireless communication apparatus includes a first antenna circuit that forms a beam selected from among a plurality of first beams through a beamforming process performed for communication using a millimeter wave band and a monitor that displays a first pattern indicating a radiation direction of the selected beam.

Abstract: A terminal device includes a communicator that, after first data communication carried out with the use of a narrowly directional first beam, receives, by using a widely directional beam, a plurality of first signals that a base station device has transmitted by using respective narrowly directional beams, and a determination circuitry that calculates the reception quality of the plurality of first signals and determines a narrowly directional second beam that the base station device uses for communication. The communicator transmits a feedback signal including information indicating the second beam to the base station device by using the first beam and starts second data communication by using the first beam in a case in which the communicator has received, by using the first beam, a response indicating that the base station device has received the feedback signal.

Abstract: Provided is a content delivery system in which a content delivery server delivers content to a content delivery client. The content delivery client transmits content using first wireless communication, detects the area of second wireless communication, and if it determines that sufficient free space is not present in a first storage thereof, transmits a part of data stored in the first storage to the content delivery server using the second wireless communication. The content delivery server makes free space in the first storage by temporarily storing the data in a second storage thereof and then delivers content using the second wireless communication on the basis of the control information.

Abstract: An intersection information distribution apparatus includes a plurality of image capturers, one or more first wireless communicators, a position estimator, and a controller. The plurality of image capturers capture images in and around an intersection. The one or more first wireless communicators perform directional communication with a second wireless communicator mounted on a vehicle. The position estimator estimates a position of the vehicle in and around the intersection from a communication state of the directional communication. The controller selects a piece of data from among pieces of data of the images captured by the plurality of image capturers on the basis of the estimated position of the vehicle. The one or more first wireless communicators transmit the selected piece of data to the second wireless communicator of the vehicle.

Abstract: Provided is a content delivery system in which a content delivery server delivers content to a content delivery client. The content delivery client transmits content using first wireless communication, detects the area of second wireless communication, and if it determines that sufficient free space is not present in a first storage thereof, transmits a part of data stored in the first storage to the content delivery server using the second wireless communication. The content delivery server makes free space in the first storage by temporarily storing the data in a second storage thereof and then delivers content using the second wireless communication on the basis of the control information.

Abstract: A millimeter-wave controller receives, from a microwave-communication control apparatus belonging to a microwave network, a first signal including location information of a first terminal belonging thereto and a use request for the first terminal to use the millimeter-wave network. A beam range for the first terminal and a first wireless resource that is included in one or more wireless resources of one or more millimeter-wave access points and that is to be allocated to the first terminal are set based on the location information. A use permission for the millimeter-wave network and first connection information for connection to a first millimeter-wave access point corresponding to the first wireless resource are transmitted to the microwave-communication control apparatus.

Abstract: A distortion-compensating power amplifier compensates for nonlinear distortion in a power amplifier. The distortion-compensating power amplifier includes: a predistorter that performs pre-distortion processing, the pre-distortion processing applying an inverse characteristic of a distortion characteristic that is generated in the power amplifier to an input signal; a filter that performs band limitation on the pre-distorted input signal by using a frequency characteristic that is asymmetric with respect to a center frequency of the input signal, the filter having a filter coefficient that is a complex number; a down-sampler that down-samples the band-limited input signal; and a digital-to-analog converter that converts the down-sampled input signal from a digital signal to an analog signal.

Abstract: A radio communication device includes a plurality of directional communicating circuitry which, in operation, each become connected to one or more radio terminals through beam forming and perform radio communication, and space time coordinating circuitry which, in operation, performs controlling of the beam forming of each of the plurality of directional communicating circuitry in accordance with connection information on the connected one or more radio terminals and interference information on interference among the plurality of directional communicating circuitry.

Abstract: A distortion-compensating power amplifier compensates for nonlinear distortion in a power amplifier. The distortion-compensating power amplifier includes: a predistorter that performs pre-distortion processing, the pre-distortion processing applying an inverse characteristic of a distortion characteristic that is generated in the power amplifier to an input signal; a filter that performs band limitation on the pre-distorted input signal by using a frequency characteristic that is asymmetric with respect to a center frequency of the input signal, the filter having a filter coefficient that is a complex number; a down-sampler that down-samples the band-limited input signal; and a digital-to-analog converter that converts the down-sampled input signal from a digital signal to an analog signal.

Abstract: A signal-generating circuit includes a voltage-controlled oscillator that generates an oscillated signal; a first frequency divider that generates a first divided signal by dividing the oscillated signal; a second frequency divider that generates a second divided signal by dividing the divided signal; a phase comparator that receives as input the second divided signal and a reference signal and outputs two signals corresponding to a phase difference therebetween; a loop filter that extracts a low frequency signal between the two signals to be output to the voltage-controlled oscillator; a third frequency divider that generates a third divided signal by dividing the first divided signal; a first frequency converter that generates a first frequency converted signal by multiplying the oscillated signal by the third divided signal; and a first multiplier that generates a multiplied signal by multiplying the first frequency converted signal by a first multiplication number.

Abstract: A signal-generating circuit includes a voltage-controlled oscillator that generates an oscillated signal; a first frequency divider that generates a first divided signal by dividing the oscillated signal; a second frequency divider that generates a second divided signal by dividing the divided signal; a phase comparator that receives as input the second divided signal and a reference signal and outputs two signals corresponding to a phase difference therebetween; a loop filter that extracts a low frequency signal between the two signals to be output to the voltage-controlled oscillator; a third frequency divider that generates a third divided signal by dividing the first divided signal; a first frequency converter that generates a first frequency converted signal by multiplying the oscillated signal by the third divided signal; and a first multiplier that generates a multiplied signal by multiplying the first frequency converted signal by a first multiplication number.

Abstract: A phase to digital conversion circuit with improved resolution for a rotary traveling wave oscillator. The phase to digital conversion circuit connects with a closed loop transmission line via a plurality of signal lines or nodes distributed along the transmission line. As an oscillating signal propagates around the transmission line, a time waveform of the signal at each of the plurality of signal lines is transmitted to a corresponding plurality of latches. Upon a triggering condition, the plurality of latches simultaneously samples the signals from the plurality of signal lines. At least two reference clock signals are switchably coupled with the plurality of latches latch for triggering the plurality of latches based on an edge transition in each of the reference clock signals compared with an edge transition in each of the signals from the plurality of taps.

Abstract: A phase to digital conversion circuit with improved resolution for a rotary traveling wave oscillator. The phase to digital conversion circuit connects with a closed loop transmission line via a plurality of signal lines or nodes distributed along the transmission line. As an oscillating signal propagates around the transmission line, a time waveform of the signal at each of the plurality of signal lines is transmitted to a corresponding plurality of latches. Upon a triggering condition, the plurality of latches simultaneously samples the signals from the plurality of signal lines. At least two reference clock signals are switchably coupled with the plurality of latches latch for triggering the plurality of latches based on an edge transition in each of the reference clock signals compared with an edge transition in each of the signals from the plurality of taps.

Abstract: A multi-mode communications transmitter includes a signal decomposer that converts rectangular-coordinate in-channel and quadrature channel signals into polar-coordinate amplitude and angle component signals and form therefrom first and second modulation signals. The signal decomposition process performed by the signal decomposer combines envelope-reduction and restoration (ERR) with filtering to reduce the bandwidths of the first and second modulation signals compared to the bandwidths of the unmodified amplitude and angle component signals. The reduction in signal bandwidths eases the design requirements of the electrical components needed to process and generate the signals applied to the power supply and radio frequency (RF) input ports of the multi-mode communications transmitter's power amplifier (PA).

Abstract: An automatically calibrating time to digital conversion circuit. The circuit includes a first circuit node for switchably receiving a first calibration signal and a second circuit node coupled with the first circuit node via a first delay path. A third circuit node for switchably receiving a second calibration signal the same as the first calibration signal is coupled with a fourth circuit node via a second delay path. A calibration portion has a third delay path switchably connected with the fourth circuit node and a fourth delay path switchably connected with the second circuit node. The calibration portion generates a delay adjustment signal for adjusting a time delay of the first delay path such that the first time delay combined with the fourth time delay equals the second time delay combined with the third time delay. The calibration portion is disconnected when calibration is not desired for conserving power.

Abstract: A low cost high-efficiency all-digital transmitter using all-digital power amplifiers (“DPA”) and various mapping techniques to generate an output signal, which substantially reproduces a baseband signal at a carrier frequency. A baseband signal generator generates a baseband signal which is quantized by a signal processor using a quantization map. A DPA control mapper outputs control signals to phase selectors using the quantized signal and a quantization table. Each phase selector receives one of the control signals and outputs a waveform at a carrier frequency with a phase corresponding to the control signals, or an inactive signal. Each DPA in a DPA array has an assigned weight, receives one of the waveforms from the phase selectors, and outputs a power signal according to the weight of the DPA and the phase of the received waveform. The combined power signal substantially reproduces the baseband signal at the carrier frequency.

Abstract: The disclosure relates to a method and apparatus for providing efficient signal transmission. Conventional linear amplifiers are most efficient when operated in compressed mode. In the compressed mode, the digital power amplifier switches between the on and off modes. A digital power amplifier operates in compressed mode only if the incoming signal is an on-off constant envelop signal. In one embodiment, the disclosure provides a method and apparatus for converting a digital baseband signal to on-off constant envelop signals for processing through binary-weighted or thermometer-weighted amplifier which are operated in compressed mode.