Abstract: In the conventional distributed control system, since each control device updates the data area at a timing when a control packet is received, in a case where there is a difference in communication delay between the control devices or in a case where the communication delay includes jitter, it is difficult to match the contents of data in all the control devices in a case of focusing on a certain moment during system operation. Therefore, depending on the start timing of a control application, the control application operates on the basis of different data between the control devices, thus limiting control performance improvement. Accordingly, time slots on the network are allocated according to the result of a calculation unit, and a cyclic memory synchronization update unit synchronizes the timing of reflecting data in the input/output and the cyclic memory and the timing of using data of a cyclic memory.

Abstract: A data generation apparatus according to one embodiment includes processing circuitry. The processing circuitry receives a relative value of molecules in a first region as input data. The processing circuitry applies, to the input data, a function having predetermined coefficients to be learned. The processing circuitry computes a relative value of the molecules in a second region to be output data from the function. The processing circuitry outputs the output data.

Abstract: An electronic component has a first member in which an electrostatic actuator is provided, a second member in which a drive integrated circuit for driving the electrostatic actuator is provided, and join parts that joins the first member and the second member while a surface on which the electrostatic actuator is provided in the first member and a surface on which the drive integrated circuit is provided in the second member are opposed to each other. The electrostatic actuator and the drive integrated circuit are disposed in a space surrounded by the first member, the second member, and the join parts.

Abstract: It is determined whether or not to perform a handover to switch a destination of connection of a mobile terminal (10) from a first radio base station (20) to a second radio base station (30), the mobile terminal holding data communications with the first radio base station (20) by MIMO communications using a plurality of transmission channels. If it is determined to perform the handover, the data communications between the mobile terminal and the first base station are suspended, and communications pertaining to the handover are started between the mobile terminal and each of the base stations by ordinary communications using a single transmission channel. After the completion of the handover, communication mode between the mobile terminal and the second radio base station is switched from the ordinary communications to MIMO communications.

Abstract: A mobile communication apparatus including a transmission portion which transmits data after varying an amount of data to be transmitted under control of scheduling from at least a base station, including a schedule portion that stops an operation of an unnecessary circuit by controlling an operation rate of the transmission portion.

Abstract: A transmitter-receiver of this embodiment includes a plurality of antennas (15-a-15-d) for receiving signals in which a plurality of data are spatially multiplexed, a plurality of RF receivers (16-a-16-d) and a plurality of demodulators (18-a-18-d) respectively corresponding to the plurality of antennas, and a network interface (111) and power supply/clock controller (110) for activating only an RF receiver and demodulator corresponding to one of the plurality of antennas in a reception standby period. In the reception standby period, other RF receivers and demodulators are stopped. This makes it possible to largely reduce the power consumption in a communication system having a long reception standby period.

Abstract: A mobile communication apparatus including a transmission portion which transmits data after varying an amount of data to be transmitted under control of scheduling from at least a base station, including a schedule portion that stops an operation of an unnecessary circuit by controlling an operation rate of the transmission portion.

Abstract: An initial synchronization method in a DS-CDMA inter-base station asynchronous cellular scheme of transmitting a spreading code sequence, includes: a first stage that detects correlation power values between the common identification code and a received signal by using a correlator and performs a threshold determination; a second stage that detects a correlation value between the received signal and each long code group identification short code, sets a group having a maximum correlation sum as a group, detects a slot in which a head of the pattern is obtained as a start slot of a frame, and compares an arbitrarily set threshold with the maximum correlation sum; and a third stage that sequentially generates replica codes of long codes and short codes, performs correlation detection for the obtained synchronization timing, and performs long code correlation detection.

Abstract: To provide a non-linear distortion compensation circuit for multi-carrier transmission in which the non-linear distortion and the consumption power can be reduced by a simple method. A frame format control section notifies the frame format information on transmission data to a transmission amplification control section, which selects the optimal amplifier from the power amplifiers of a variable transmission amplification section in accordance with the notified frame format information. In the variable transmission amplification section, the switch selects the low power amplifier having higher efficiency at the time of transmission on the channel requiring no power, in which the transmission level is finely adjusted by the attenuator for transmission. Also, the switch selects the high power amplifier by giving priority to the linearity over the efficiency at the time of transmission on the channel requiring high power, in which the transmission level is finely adjusted by the attenuator for transmission.

Abstract: An equalizer with a phase-locked loop comprising: a phase rotator which rotates a phase of a received signal to output a rotated signal; an impulse response detector which detects impulse responses of a transmission line through which the received signal has been transmitted on the basis of the rotated signal; a first region designator which designates a first region on the basis of the impulse responses; a second region designator which designates a second region on the basis of the impulse responses; an equalizer which estimates a sequence on the basis of the rotated signal by using the impulse responses in the first region; a replica generator which generates a replica of the received signal on the basis of the sequence by using the impulse responses in the second region; a phase detector which detects a phase difference between the replica and the rotated signal; and a circuit for controlling the phase rotator on the basis of the phase difference to decrease the phase difference.

Abstract: A radio data communication terminal that includes a phase rotator for correcting a narrow-band modulation system, an equalizer for correcting a transmission path distortion of the frame signal corrected in phase, and a calculating circuit for calculating the phase error by using a preamble in the frame signal, he phase error is used for the phase error correction in the phase rotating means. The terminal further includes a transmission path distortion estimator for estimating the transmission path distortion by using the preamble in the frame signal corrected in phase and calculating tap coefficients necessary for the equalizer. A setter is provided for setting the tap coefficients to the equalizer and a first delay circuit delays the frame signal. A selection circuit selects an input or output of the first delay circuit and outputs the selected one to the phase rotator so that the calculating circuit and the transmission path distortion estimator operate while using the same portion of the preamble.

Abstract: An automatic frequency control circuit includes a phase difference detection circuit, average value calculation circuit, weighting circuit, and phase correction circuit. The phase difference detection circuit obtains the phase difference between pattern signals per period on the basis of a quadrature-demodulated pattern signal component and a pattern signal component one period before the quadrature-demodulated pattern signal component. The average value calculation circuit calculates the average value of first phase differences between the pattern signals repetitively output from the phase difference detection circuit, thereby obtaining a second phase difference in units of symbols in the current burst. The weighting circuit weights the second phase difference from the average value detection circuit and a third phase difference up to the previous burst, thereby obtaining a fourth phase difference up to the current burst.

Abstract: Disclosed is an automatic frequency control circuit for correcting the influence of frequency offset in a radio data communication terminal of a scheme in which transmission path characteristics are obtained during the preamble period by narrow-band modulation to equalize the received signal. The automatic frequency control circuit includes, on the transmitter side, a unit for repeatedly transmitting the pattern of a predetermined pseudo noise (PN) signal serving as a preamble signal, on the receiver side, a unit for calculating the phase difference per PN cycle on the basis of the component (real and imaginary part amplitude values) of a PN signal one cycle before that is quadrature-modulated during a predetermined period of the preamble, and the component of a current PN signal, a unit for dividing the phase difference by the number of symbols of one PN cycle to obtain the phase difference (.DELTA..theta.) of the unit symbol, a unit for holding .DELTA..theta.

Abstract: A phase-locked loop circuit, which is used in a radio data communication terminal of the type that obtains a transmission line characteristic during a preamble period in a narrow band modulation mode and equalizes received signals, that can correct an influence due to a phase error even in an environment of frequency selective multipath fading. The phase-locked loop circuit includes a phase rotation section, a replica signal generator, a phase difference detector, a division section, an integration circuit, and a vector converter. An equalizer obtains tap coefficients determined by transmission line characteristics and sets them to the equalizer and the replica signal generator. The equalizer starts to demodulate data and sequentially inputs the demodulated data to the replica signal generator to reproduce I and Q signal components input to the equalizer based on the demodulation data and tap coefficients.

Abstract: A radio data communication device that can perform a packet communication with the packet configuration suitable for transmission of a large volume of data in packet communications utilizing a low rate transmission mode and a high rate transmission mode. The transmitter side transmits packets only in a low rate mode or in a high rate mode after transmission in a low rate mode or only in a high rate mode. The receiver side simultaneously demodulates packets in the low rate mode and the high rate mode to detect the synchronous signal for each mode and judges whether or not in which mode the data has been transmitted, thus selecting the successive receive mode.

Abstract: A correlator 1 and an amplitude detection section 2 detect a correlation value of a spectrum spread signal. A maximum value detection section 5 detects a maximum correlation value for each symbol, which is then sequentially added by an adder section 6. A carrier detection section 4 compares the added value with a threshold value so as to detect presence/absence of carrier.

Abstract: In a radio transmitter-receiver, a single frequency conversion method is used at a side of transmission and a double frequency conversion method is used at a side of reception. The frequency for transmission is identical with that of reception. A common oscillator of an oscillation frequency f1 is used for a local frequency for transmission/reception-first frequency conversion. A reception second local frequency signal and a transmitter intermediate frequency signal are generated by independent oscillators with oscillation frequencies 2f2 and 2f3 respectively. These oscillators generate two times the frequency of the conventional example thereof, thus providing the signals with frequency of 1/2 times the frequency-division by the frequency dividers for the reception side second frequency converter and transmission side intermediate frequency converters respectively.

Abstract: In a receiving apparatus for spread spectrum communications, a carrier detecting circuit for detecting a carrier in a spread spectrum modulated signal is intermittently operated in a standby mode.

Abstract: In a waiting mode after transmission, a radio receiver is operated to convert a radio frequency signal into an intermediate frequency signal of which a signal level is checked. When the signal level is higher than a predetermined level, a reception mode starts for spectrum-despreading the intermediate frequency signal to provide a spectrum-despread signal and demodulating the spectrum-despread signal.

Abstract: A terminal unit for a wireless communication network includes a wireless modem, a wire network controller, and a CPU. The modem can check whether a RTS signal is inputted or not during reception of communication data, and modulates communication data and performs wireless transmission of the data in response to the RTS signal when no communication data is being received, while it temporarily outputs a CTS signal and disables it thereafter in response to the RTS signal when communication data is being received. Upon reception of a data transmission request from the terminal unit, the controller outputs the RTS signal to the modem after completion of reception of communication data when the data is being received, or outputs the RTS signal to the modem when no communication data is being received. The controller determines interruption of data transmission and outputs a RTI signal when the CTS signal from the modem is temporarily input and disabled thereafter.