Abstract: A problem of heat dissipation in motors, converters, high-luminance LEDs, power devices, power supplies, and the like becomes significant. Provided is a means for capable of providing a product, which has favorable workability, segregation stability, storage stability, and the like, penetrates into a gap in a coil portion, an interface in casing, and the like without any gaps, enhances thermal conductivity/heat dissipation properties of a molded product thus obtained, and is excellent in electrical characteristics, toughness/elastic modulus, thermal resistance, thermal cycle properties, and the like, in the case of using the product for a cast molding resin, a potting material (sealing material), an adhesive, grease, and the like.

Abstract: A distortion compensation device includes a distortion compensation unit, a feedback coefficient calculating unit, a clip processing unit, and an updating unit. The distortion compensation unit generates a distortion compensation signal from a transmission signal by using a distortion compensation coefficient and inputs the generated distortion compensation signal to a power amplifier. The feedback coefficient calculating unit calculates a feedback coefficient based on an output signal from the power amplifier. The clip processing unit outputs the feedback coefficient when absolute value of the feedback coefficient is less than a threshold. Furthermore, the clip processing unit outputs a feedback coefficient of which absolute value is less than the threshold when the absolute value of the feedback coefficient is greater than the threshold.

Abstract: A distortion compensation device includes a first table, a second table, a calculating unit, a first updating unit, and a second updating unit. The first table holds a coefficient of a nonlinear term included in a filtering coefficient associated with an address other than a prescribed address obtained from the input signal x(n). The second table holds a coefficient of a linear term related to the prescribed address. The calculating unit calculates, based on the output signal, each of the update amounts of the coefficient of the nonlinear term and the coefficient of the linear term. The first updating unit updates each of the coefficients in the first table based on the update amount of the coefficient of the nonlinear term. The second updating unit updates each of the coefficients of the second table based on the update amount of the coefficient of the linear term.

Abstract: A wireless communication device includes a plurality of antennas, transmission circuits, reception circuits, and a plurality of connecting units that connect the transmission circuits and the reception circuits associated with the respective antennas, and a processor. The processor executes outputting, at timing allowed for signal transmission from the antennas, first calibration signals; calculating, by using the first calibration signals having passed through the transmission circuits, a first correction value that corrects a difference between the transmission characteristics of the transmission circuits; outputting, at the timing allowed for the signal transmission from the antennas, a second calibration signal; and calculating, by using the second calibration signal having passed through the reception circuits, a second correction value that corrects a difference between the transmission characteristics of the reception circuits.

Abstract: A distortion compensation apparatus includes a retention unit that retains a coefficient for distortion compensation for each of a plurality of time segments of a burst signal that keeps a constant power level, and a distortion compensation unit that, by using a coefficient for a time segment that corresponds to elapsed time from a head of the burst signal among the coefficients retained by the retention unit, executes distortion compensation for the time segment.

Abstract: A distortion compensation device includes: a storage configured to store a distortion compensation coefficient for compensating a distortion of a transmission signal to be amplified and transmitted, by corresponding to a combination of a plurality of addresses; a first generator configured to generate a first address according to a power or an amplitude of an input signal; a second generator configured to generate a second address according to a first vector to interconnect sample points on an IQ plane where the sample points of the input signal are drawn in time series; and a distortion compensation unit configured to acquire the distortion compensation coefficient corresponding to a combination of the first address and the second address from the storage, and to perform a predistortion processing on the input signal, by using the acquired distortion compensation coefficient, so as to generate the transmission signal.

Abstract: A radio communication device includes: an instantaneous coefficient acquisition unit that acquires an instantaneous coefficient that corrects an instantaneous change contained in a burst distortion corresponding to an elapsed time from a top of a burst signal in which a constant power level continues and instantaneously changes the power level of the burst signal; an average coefficient acquisition unit that acquires an average coefficient that corrects an average change contained in the burst distortion and gradually changes the power level of the burst signal from the top to an end of the burst signal; a synthesizer that synthesizes the instantaneous coefficient acquired by the instantaneous coefficient acquisition unit with the average coefficient acquired by the average coefficient acquisition unit; and a corrector that uses a correction coefficient obtained from the synthesizing by the synthesizer to correct the burst distortion occurring in the burst signal.

Abstract: A peak suppression device includes an acquiring unit that acquires multiple envelopes of carrier signals that are included in a multicarrier signal, an adding unit that adds the envelopes to generate a combined envelope, a detecting unit that detects a peak value and a peak timing of the multicarrier signal by using the combined envelope, and a suppressing unit that suppresses a peak of the multicarrier signal in accordance with the peak value and the peak timing.

Abstract: A distortion compensation device includes a multiplier, a subtracter, an LUT, and a distortion compensation unit. The multiplier calculates the product of amplitudes or the product of power of transmission signals at two different times or calculates the ratio of amplitudes or the ratio of power of transmission signals at two different times. The subtracter calculates the phase difference between the transmission signals at two different times. The LUT specifies a distortion compensation coefficient by using both the product or the ratio calculated by the multiplier and the phase difference calculated by the subtracter. The distortion compensation unit performs, by using the distortion compensation coefficient specified by the LUT, a predistortion process on the transmission signal that is input to the amplifier.

Abstract: A peak suppression device includes a suppression-signal generating unit and a band pass filter (BPF). The suppression-signal generating unit generates a suppression signal that is obtained by adding, to a transmission signal, a frequency component in which components of frequencies from a boundary of a band of the transmission signal to a frequency that is away therefrom toward an out-band of the transmission signal by predetermined frequencies are attenuated, out of frequency components of a signal to suppress a peak of the transmission signal. The BPF attenuates, after the suppression signal is amplified by the amplifier, a frequency component outside the band of the transmission signal in the amplified suppression signal.

Abstract: A distortion compensation device includes a multiplier, a subtracter, an LUT, and a distortion compensation unit. The multiplier calculates the product of amplitudes or the product of power of transmission signals at two different times or calculates the ratio of amplitudes or the ratio of power of transmission signals at two different times. The subtracter calculates the phase difference between the transmission signals at two different times. The LUT specifies a distortion compensation coefficient by using both the product or the ratio calculated by the multiplier and the phase difference calculated by the subtracter. The distortion compensation unit performs, by using the distortion compensation coefficient specified by the LUT, a predistortion process on the transmission signal that is input to the amplifier.

Abstract: A base station including: a memory, and a processor coupled to the memory and the processor configured to: estimate a plurality of angles of arrival based on a plurality of received signals from a plurality of wireless device respectively, each of the plurality of angles of arrival being an angel of a horizontal plane relative to each direction from which each of the plurality of received signals arrives, and control at least one tilt angel based on the plurality of angels of arrival, each of the at least one tilt angle being an angle of the horizontal plane relative to each direction to which at least one beam is formed.

Abstract: A distortion compensation device includes an address generating unit, an LUT, and a multiplier. The address generating unit calculates the magnitude of a first vector and the angle formed by the first vector and a second vector. The first vector is represented by using the origin in an IQ coordinate plane as the starting point and using a transmission signal point at a first time as the end point. The second vector is represented by using a transmission signal point at a second time that is predetermined time before the first time as the starting point and using the transmission signal point at the first time as the end point. The LUT specifies a distortion compensation coefficient by using the calculated magnitude and the calculated angle. The multiplier performs a predistortion process on a transmission signal input to an amplifier by using the specified distortion compensation coefficient.

Abstract: A distortion compensation device includes an address generating unit, a look up table (LUT), and a multiplier. The address generating unit calculates pieces of difference information for different combinations each including transmission signals at different timings. Each of the pieces of difference information is the difference in amplitude or power between the transmission signals in a corresponding one of the combinations. The LUT specifies a distortion compensation coefficient by using the above pieces of difference information calculated by the address generating unit. The multiplier performs predistortion, using a distortion compensation coefficient specified by the LUT, on a transmission signal to be input to an amplifier.

Abstract: A radio communication device includes: an instantaneous coefficient acquisition unit that acquires an instantaneous coefficient that corrects an instantaneous change contained in a burst distortion corresponding to an elapsed time from a top of a burst signal in which a constant power level continues and instantaneously changes the power level of the burst signal; an average coefficient acquisition unit that acquires an average coefficient that corrects an average change contained in the burst distortion and gradually changes the power level of the burst signal from the top to an end of the burst signal; a synthesizer that synthesizes the instantaneous coefficient acquired by the instantaneous coefficient acquisition unit with the average coefficient acquired by the average coefficient acquisition unit; and a corrector that uses a correction coefficient obtained from the synthesizing by the synthesizer to correct the burst distortion occurring in the burst signal.

Abstract: A distortion compensator that compensates for nonlinear distortion of an amplifier that amplifies power of a multicarrier signal includes a first compensation unit that performs first distortion compensation to collectively compensate for first nonlinear distortion that occurs in contact with a carrier frequency of the multicarrier signal, and second nonlinear distortion that occurs at a frequency at a predetermined distance from the carrier frequency, and a second compensation unit that performs second distortion compensation to compensate for only the first nonlinear distortion, of the first nonlinear distortion and the second nonlinear distortion.

Abstract: A peak suppression apparatus includes an acquiring unit that acquires a first signal represented by an amplitude waveform of a multicarrier signal, a generator that generates a second signal represented by a waveform sequentially connecting a plurality of peak points adjacent to one another in the first signal as a peak detection signal for the multicarrier signal, a detector that detects a peak value and a peak timing of the multicarrier signal by using the peak detection signal, and a suppressing unit that suppresses a peak of the multicarrier signal based on the peak value and the peak timing.

Abstract: A distortion compensation apparatus includes a retention unit that retains a coefficient for distortion compensation for each of a plurality of time segments of a burst signal that keeps a constant power level, and a distortion compensation unit that, by using a coefficient for a time segment that corresponds to elapsed time from a head of the burst signal among the coefficients retained by the retention unit, executes distortion compensation for the time segment.

Abstract: A distortion compensator that compensates for nonlinear distortion of an amplifier that amplifies power of a multicarrier signal includes a first compensation unit that performs first distortion compensation to collectively compensate for first nonlinear distortion that occurs in contact with a carrier frequency of the multicarrier signal, and second nonlinear distortion that occurs at a frequency at a predetermined distance from the carrier frequency, and a second compensation unit that performs second distortion compensation to compensate for only the first nonlinear distortion, of the first nonlinear distortion and the second nonlinear distortion.

Abstract: A peak suppression device includes a suppression-signal generating unit and a band pass filter (BPF). The suppression-signal generating unit generates a suppression signal that is obtained by adding, to a transmission signal, a frequency component in which components of frequencies from a boundary of a band of the transmission signal to a frequency that is away therefrom toward an out-band of the transmission signal by predetermined frequencies are attenuated, out of frequency components of a signal to suppress a peak of the transmission signal. The BPF attenuates, after the suppression signal is amplified by the amplifier, a frequency component outside the band of the transmission signal in the amplified suppression signal.