Transmission apparatus, radio communication apparatus, and transmission method

摘要

Disclosed is a transmission apparatus, a radio communication apparatus, and a transmission method for making it possible to obtain stable characteristics by controlling the difference of time between an amplitude signal and a phase signal to an optimal point, without depending on a modulated signal nor making the circuit size larger. A multiplier (170) generates, in a pseudo manner, a digital modulated signal corresponding to a signal that is obtained by performing analog to digital conversion on a modulated signal that is generated by an amplitude modulator (140), by multiplying a digital amplitude signal that is obtained by performing analog to digital conversion on an amplitude signal by a digital angle modulated signal corresponding to a signal that is obtained by performing analog to digital conversion on an angle modulated signal. Distortion calculation section (180) calculates distortion of the digital modulated signal, control section (190) controls delay time based on the distortion of the digital modulated signal, and delay adjustment section (130) adjusts delay time until the amplitude signal is input to amplitude modulator (140), or delay time until the angle modulated signal is input to amplitude modulator (140).

主权项

1. A transmission apparatus comprising:
an angle modulation section that generates an angle modulated signal in a radio frequency domain using an angle signal of an input signal; an amplitude modulator that generates a modulated signal by amplifying power of the angle modulated signal according to an amplitude signal of the input signal; a first generation section that generates a digital amplitude signal by performing analog to digital conversion on the amplitude signal; a second generation section that generates a digital angle modulated signal corresponding to a signal obtained by performing analog to digital conversion on the angle modulated signal; a multiplier that generates, in a pseudo manner, a digital modulated signal corresponding to a signal that is obtained by performing analog to digital conversion on the modulated signal, by multiplying the digital amplitude signal by the digital angle modulated signal; a distortion calculation section that calculates distortion of the digital modulated signal; an adjustment section that adjusts delay time until the amplitude signal is input to the amplitude modulator, or delay time until the angle modulated signal is input to the amplitude modulator; and a control section that controls the delay time based on the distortion, wherein: the second generation section comprises: an analog to digital converter that generates a digital angle signal by performing analog to digital conversion on the angle signal; and a digital angle modulation section that generates the digital angle modulated signal in a baseband domain based on the digital angle signal, wherein: the angle signal is a phase signal; the digital angle signal is a digital phase signal that is obtained by performing analog to digital conversion on the phase signal; the angle modulation section is a phase modulator; the digital angle modulation section comprises a complex number calculation section that generates a digital real number signal and a digital imaginary number signal that are obtained by performing analog to digital conversion on a real number component and an imaginary number component of the phase signal using the digital phase signal, as the digital angle modulated signals; and the multiplier comprises: a first multiplier that generates a real number component of the digital modulated signal by multiplying the digital amplitude signal by the digital real number signal; and a second multiplier that generates an imaginary number component of the digital modulated signal by multiplying the digital amplitude signal by the digital imaginary number signal; wherein: the distortion calculation section calculates the distortion using the real number component and the imaginary number component of the digital modulated signal.