Patent
Transmission apparatus, communication apparatus and mobile radio apparatus
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TLDR
In this article, the authors proposed a mechanism to reduce the distortion of the vector modulation wave that is the transmission output to a sufficiently small level by adjusting a delay time difference between the amplitude component modulation signal and the phase component modulation signals.Abstract:
Transmission apparatus capable of reducing distortion of the vector modulation wave that is the transmission output to a sufficiently small level is provided. An amplifying section ( 105 ) generates a vector modulation wave based on an amplitude component modulation signal and a phase modulation wave. A synchronous demodulating section ( 107 ) detects the vector modulation wave, generates a synchronous demodulation signal, and sends this to a band filtering section ( 108 ). The band filtering section ( 108 ) extracts a signal of the frequency component of the distortion from a synchronous demodulation signal outputted by the synchronous demodulating section ( 107 ). A controlling section ( 109 ) then refers to the distortion component signal extracted by the band filtering section ( 108 ), controls a delay time adjusting section ( 103 ) in such a manner that the signal level of the distortion component becomes small, adjusts a delay time difference between the amplitude component modulation signal and the phase component modulation signal, and reduces distortion of the modulation wave.read more
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References
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