Communication apparatus using a plurality of modulation schemes and transmission apparatus composing such communication apparatus

摘要

A first signal generation section 11 generates a baseband modulation signal for an ASK modulation scheme from transmission data. A second signal generation section 12 generates a pair of baseband modulation signals for a non-ASK modulation scheme from transmission data. When performing non-ASK modulation, a switch 15 connects between an input terminal d and an output terminal and outputs the baseband modulation signals based on the non-ASK modulation. When performing ASK modulation such that the transmission power ratio of the ASK modulation scheme to the non-ASK modulation scheme is a factor of 1, a switch 14 connects between an input terminal b and an output terminal and the switch 15 connects between an input terminal c and the output terminal. When performing ASK modulation such that the transmission power ratio is a factor of 2, the switch 14 connects between an input terminal a and the output terminal and the switch 15 connects between the input terminal c and the output terminal.