Peak suppression device and peak suppression method

A peak suppression device comprising:

• a suppression-signal generating unit that 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;
• and
• a band pass filter that attenuates, after the suppression signal is amplified by an amplifier, a frequency component outside the band of the transmission signal, in the amplified suppression signal, wherein the suppression-signal generating unit includes:
• a detecting unit that detects timing of a peak of amplitude that exceeds a predetermined threshold out of peaks of amplitude of the transmission signal;
• a signal generating unit that generates a cancellation signal having a peak synchronized with the timing detected by the detecting unit, and having frequency components in which a frequency component in the band of the transmission signal and a frequency component of frequencies from the boundary of the band of the transmission signal to a frequency away therefrom toward the outside of the band of the transmission signal by predetermined frequencies, out of frequency components of an impulse signal are attenuated;
• and
• a combining unit that combines the transmission signal and the cancellation signal, thereby generating the suppression signal.

A peak suppression device comprising:

• a suppression-signal generating unit that 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;
• and
• a band pass filter that attenuates, after the suppression signal is amplified by an amplifier, a frequency component outside the band of the transmission signal, in the amplified suppression signal,
• wherein:
• the suppression-signal generating unit further generates the suppression signal in which a frequency component within the band of the transmission signal, out of frequency components of a signal to suppress a peak of the transmission signal, is further added to the transmission signal, and
• the suppression-signal generating unit includes:
• a detecting unit that detects timing of a peak of amplitude that exceeds a predetermined threshold, out of peaks of amplitude of the transmission signal;
• a signal generating unit that generates a cancellation signal having a peak synchronized with the timing detected by the detecting unit, and having frequency components in which a frequency component of frequencies from the boundary of the band of the transmission signal to a frequency away therefrom toward the outside of the band of the transmission signal by predetermined frequencies, out of frequency components of an impulse signal is attenuated;
• and
• a combining unit that combines the transmission signal and the cancellation signal, thereby generating the suppression signal.

A peak suppression device comprising:

• a suppression-signal generating unit that 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;
• and
• a band pass filter that attenuates, after the suppression signal is amplified by an amplifier, a frequency component outside the band of the transmission signal, in the amplified suppression signal,
• wherein:
• the suppression-signal generating unit further generates the suppression signal in which a frequency component within the band of the transmission signal, out of frequency components of a signal to suppress a peak of the transmission signal, is added to the transmission signal,
• the suppression-signal generating unit includes:
• a first suppressing unit;
• and
• a second suppressing unit,
• the first suppressing unit includes:
• a first amplitude-limiting unit that generates an amplitude limited signal in which an amplitude of the transmission signal is limited within a predetermined threshold;
• a high pass filter that attenuates a frequency component within the band of the transmission signal and a frequency component of frequencies from the boundary of the band of the transmission signal to a frequency away therefrom toward the outside of the band of the transmission signal by predetermined frequencies, out of frequency components of the amplitude limited signal;
• and
• a first combining unit that combines the transmission signal and a signal output from the high pass filter, and
• the second suppressing unit includes:
• a detecting unit that detects timing of a peak of amplitude that exceeds a predetermined threshold out of peaks of amplitude of a signal output from the first combining unit;
• a signal generating unit that generates a cancellation signal that has a peak synchronized with the timing detected by the detecting unit, and in which a frequency component outside the band of the transmission signal is attenuated;
• and
• a second combining unit that combines a signal output from the first combining unit and the cancellation signal, thereby generating the suppression signal.

A peak suppression method comprising:

• generating 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;
• and
• attenuating, after the suppression signal is amplified by an amplifier, a frequency component outside the band of the transmission signal, in the amplified suppression signal,
• wherein the suppression signal includes frequency components of a signal to suppress a peak of the transmission signal within the band of the transmission signal, and
• wherein the generating a suppression signal comprises:
• attenuating, among frequency components of the signal to suppress a peak of the transmission signal, a frequency component out of the band of the transmission signal;
• amplifying, with a first amplification factor, a signal of which frequency component out of the band of the transmission signal is attenuated;
• attenuating, among frequency components of the signal to suppress a peak of the transmission signal, a frequency component within the band of the transmission signal and a frequency component which is from a boundary of the band of the transmission signal to a frequency that is away therefrom toward an out-band of the transmission signal by a predetermined frequency;
• amplifying, with a second amplification factor that is controlled independently of the first amplification factor, a signal of which the frequency component within the band of the transmission signal and the frequency component which is from the boundary of the band of the transmission signal to a frequency that is away therefrom toward the out-band of the transmission signal by predetermined frequencies are attenuated;
• and
• combining the signal amplified with the first amplification factor and the signal amplified with the second amplification factor to generate the suppression signal.