Abstract: According to one embodiment, an electronic apparatus includes controller circuitry, transmitter circuitry, and receiver circuitry. The controller circuitry is configured to judge whether a payload for a first packet comprises retransmission data; set a first PHY header for the first packet, when the payload does not comprise the retransmission data; set a second PHY header for the first packet, when the payload includes the retransmission data, wherein the second PHY header comprises an amount of information larger than an amount of information of the first PHY header; and generate the first packet comprising the payload and either one of the first PHY header or the second PHY header set for the first packet. The transmitter circuitry is configured to transmit the first packet. The receiver circuitry is configured to receive an ACK signal or a NACK signal for the first packet.

Abstract: According to one embodiment, an integrated circuit receives first packet scrambled with a first scrambling seed and second packet scrambled with a second scrambling seed, generates inversion data, generate third likelihood information by inverting signs of the first likelihood information or the second likelihood information based on the inversion data, and generates fourth likelihood information based on the third likelihood information and the second or first likelihood information.

Abstract: According to one embodiment, a baseband integrated circuit is configured to: perform division between a first component of a baseband signal modulated by a minimum shift keying scheme and the first component of a predetermined first synchronization word signal; select the division result corresponding to a frequency offset from among a plurality of division results; interpolate the selected division result; and approximate the interpolated division result by a sine wave, and estimate the frequency offset based on an approximated sine wave.

Abstract: According to one embodiment, a wireless communication device includes a receiver and a transmitter. The receiver receives N pieces of first data transmitted by N terminals in a multiplexed manner; generates combined data by combining a piece of second data with one of the N pieces of first data; decodes the N pieces of first data by using N decode processors selected from among M decode processors where M is an integer larger than N; and decodes the combined data by using a first decode processor, among the M decode processors, other than the N decode processors.

Abstract: According to one embodiment, a wireless communication device includes a transmitter configured to transmit a first field containing information to identify a plurality of wireless communication terminals, and configured to multiplex and transmit a plurality of second fields in each of which a first frame containing an address of any of the wireless communication terminals is set; and a controller configured to determine, for the first frames, values pertaining to lengths of durations to suppress access to a wireless medium to the wireless communication terminal having an address different from the address contained in each of the first frames. The transmitter is configured to set the values in the first frames, the second fields, or the first field. The controller is configured to determine the values so that the durations have an end at an identical time.

Abstract: According to one embodiment, a wireless communication device, includes a receiver configured to receive a first field, receive at least one of a plurality of second fields having been multiplexed and transmitted, and decode the one of the second fields to obtain a frame in a case where first information identifying the wireless communication device is not set in the first field, and a controller configured to suppress access to a wireless medium during a period indicated by a value set in the frame.

Abstract: According to one embodiment, an integrated circuit receives first packet scrambled with a first scrambling seed and second packet scrambled with a second scrambling seed, generates inversion data, generate third likelihood information by inverting signs of the first likelihood information or the second likelihood information based on the inversion data, and generates fourth likelihood information based on the third likelihood information and the second or first likelihood information.

Abstract: According to one embodiment, a baseband integrated circuit is configured to: perform division between a first component of a baseband signal modulated by a minimum shift keying scheme and the first component of a predetermined first synchronization word signal; select the division result corresponding to a frequency offset from among a plurality of division results; interpolate the selected division result; and approximate the interpolated division result by a sine wave, and estimate the frequency offset based on an approximated sine wave.

Abstract: A reception device includes a low noise amplifier that amplifies a radio signal by a first gain, a variable gain amplifier that amplifies an output of the low noise amplifier by a second gain, an analog-to-digital converter that converts an output of the variable gain amplifier into a digital signal, a gain controller, and a saturation detection unit. The gain controller, when an amplitude of the radio signal exceeds a predetermined value, controls the first and second gains according to the amplitude of the radio signal, and completes the control within a predetermined period. The saturation detection unit detects saturation of the analog-to-digital converter based on the output of the low noise amplifier or the digital signal. The gain controller, after controlling the first and second gains a first time and the saturation is detected by the saturation detection unit, controls the first and second gains a second time.

Abstract: In a control apparatus for a general-purpose internal combustion engine including a generator as a power supply, the generator includes a main generator coil supplying power to the stepping motor, and an auxiliary generator coil supplying power to an ignition device of the engine. The apparatus includes ignition timing controller for, when starting the engine by a manual starter, detecting that an engine speed reaches or exceeds a predetermined engine speed not exceeding a connecting rotation speed of a centrifugal clutch to retard an ignition timing of the engine, thereby suppressing increase in the engine speed to less than the connecting rotation speed, and for restoring the ignition timing to its normal timing after a predetermined time elapses from start of retarding the ignition timing. Accordingly, it suppresses overshooting of an engine speed above the connecting rotation speed even if a delay occurs in closing a throttle valve by a delay in activating the motor.

Abstract: A reception device includes a low noise amplifier that amplifies a radio signal by a first gain, a variable gain amplifier that amplifies an output of the low noise amplifier by a second gain, an analog-to-digital converter that converts an output of the variable gain amplifier into a digital signal, a gain controller, and a saturation detection unit. The gain controller, when an amplitude of the radio signal exceeds a predetermined value, controls the first and second gains according to the amplitude of the radio signal, and completes the control within a predetermined period. The saturation detection unit detects saturation of the analog-to-digital converter based on the output of the low noise amplifier or the digital signal. The gain controller, after controlling the first and second gains a first time and the saturation is detected by the saturation detection unit, controls the first and second gains a second time.

Abstract: According to one embodiment, a receiver, which is configured to receive a radio signal having a preamble including a synchronization pattern and a payload containing data, includes an antenna, a low noise amplifier, a down-conversion module, a variable gain amplifier, an auto gain controller, a synchronization acquisition module, and a demodulator. The antenna is configured to receive the radio signal. The low noise amplifier is configured to amplify an output from the antenna by applying a first variable gain. The down-conversion module is configured to down-convert an output from the low noise amplifier. The variable gain amplifier is configured to amplify an output from the down-conversion module by applying a second variable gain. The auto gain controller is configured to, in accordance with strength of the radio signal, firstly adjust the first variable gain, and after fixing the first variable gain, adjust the second variable gain.

Abstract: According to one embodiment, a receiver, which is configured to receive a radio signal having a preamble including a synchronization pattern and a payload containing data, includes an antenna, a low noise amplifier, a down-conversion module, a variable gain amplifier, an auto gain controller, a synchronization acquisition module, and a demodulator. The antenna is configured to receive the radio signal. The low noise amplifier is configured to amplify an output from the antenna by applying a first variable gain. The down-conversion module is configured to down-convert an output from the low noise amplifier. The variable gain amplifier is configured to amplify an output from the down-conversion module by applying a second variable gain. The auto gain controller is configured to, in accordance with strength of the radio signal, firstly adjust the first variable gain, and after fixing the first variable gain, adjust the second variable gain.

Abstract: According to one exemplary embodiment, a communication apparatus includes: a measurement module which measures reception power of each field; a determination module which determines whether the reception power is within a range; a calculator which calculates a gain using the reception power if the reception power is not within the range; an adjuster which adjusts a field according to one of an initial gain and the calculated gain; a selector which selects a field length according to the number of field adjustments by the adjuster; and a transmitter which transmits information regarding the field length. When the number of the adjustments is lower than a first threshold value, the selector selects a first value, and when the number of the adjustments is equal to or higher than the first threshold value, the selector selects a second value that is higher than the first value, as the field length.

Abstract: In a control apparatus for a general-purpose internal combustion engine including a generator as a power supply, the generator includes a main generator coil supplying power to the stepping motor, and an auxiliary generator coil supplying power to an ignition device of the engine. The apparatus includes ignition timing controller for, when starting the engine by a manual starter, detecting that an engine speed reaches or exceeds a predetermined engine speed not exceeding a connecting rotation speed of a centrifugal clutch to retard an ignition timing of the engine, thereby suppressing increase in the engine speed to less than the connecting rotation speed, and for restoring the ignition timing to its normal timing after a predetermined time elapses from start of retarding the ignition timing. Accordingly, it suppresses overshooting of an engine speed above the connecting rotation speed even if a delay occurs in closing a throttle valve by a delay in activating the motor.

Abstract: According to one embodiment, a radio device comprises a differential antenna that has a pair of differential power supply terminals, a transmitter that transmits a first signal via the differential antenna, a receiver that has a pair of differential input terminals and receives a second signal via the differential antenna, a first control unit, and a second control unit. The first control unit causes a signal conduction state between the differential antenna and the receiver when the receiver receives the second signal. The second control unit switches from a signal conduction state to a signal block state between one of the differential input terminals and one of the differential power supply terminals based on a reception state when the receiver receives the second signal.

Abstract: There is provided a radio receiver including: a first matched filter, a second matched filter, a first frame synchronization determining unit and a first phase determining unit. The first matched filter performs matching processing on the basis of N first tap coefficients and sign information of a received digital signal to obtain first output data. The second matched filter performs matching processing on the basis of M (M is a natural number smaller than the N) second tap coefficients, the sign information and amplitude information of the received digital to obtain second output data. The first frame synchronization determining unit determines a first frame synchronization timing of the received digital signal on the basis of the first output data. The first phase determining unit determines a first phase amount of the received digital signal on the basis of the second output data and the first frame synchronization timing.

Abstract: There is provided a radio receiver including: a first matched filter, a second matched filter, a first frame synchronization determining unit and a first phase determining unit. The first matched filter performs matching processing on the basis of N first tap coefficients and sign information of a received digital signal to obtain first output data. The second matched filter performs matching processing on the basis of M (M is a natural number smaller than the N) second tap coefficients, the sign information and amplitude information of the received digital to obtain second output data. The first frame synchronization determining unit determines a first frame synchronization timing of the received digital signal on the basis of the first output data. The first phase determining unit determines a first phase amount of the received digital signal on the basis of the second output data and the first frame synchronization timing.

Abstract: A receiver includes: a first mixer that generates an in-phase signal from a received signal; a second mixer that generates a quadrature signal from the received signal; a first A/D converter that converts the in-phase signal into a digital in-phase signal; a second A/D converter that converts the quadrature signal into a digital quadrature signal; a calculator that calculates an addition/subtraction quantity based on a correction quantity, which is based on an amplitude value of the digital in-phase signal or the digital quadrature signal, and a quantization error of the first A/D converter or the second A/D converter; and an addition/subtraction unit that adds or subtracts the addition/subtraction quantity to or from the digital in-phase signal or the digital quadrature signal.

Abstract: According to one embodiment, a radio device comprises a differential antenna that has a pair of differential power supply terminals, a transmitter that transmits a first signal via the differential antenna, a receiver that has a pair of differential input terminals and receives a second signal via the differential antenna, a first control unit, and a second control unit. The first control unit causes a signal conduction state between the differential antenna and the receiver when the receiver receives the second signal. The second control unit switches from a signal conduction state to a signal block state between one of the differential input terminals and one of the differential power supply terminals based on a reception state when the receiver receives the second signal.