Phase shift keying modulation including a data converter for converting an input data signal having 3 bits long into two ternary converted data signals

Abstract

In a phase modulation apparatus for modulating a phase of a carrier signal by an input signal to produce a phase-shift-keying-modulated wave, a data converter converts an input data signal having 3 bits long as the input signal into first and second ternary converted data signals. A ternary phase shift keying modulator modulates, in synchronism with a clock signal, the phase of the carrier signal by the first and the second ternary converted data signals to produce, as the phase-shift-keying-modulated wave, first and second ternary phase shift keying modulated signals, respectively. Disposed between the data converter and the ternary phase shift keying modulator, a parallel-serial converter temporally multiplexes the first and the second ternary converted data signals into first and second multiplexed signals, respectively. The parallel-serial converter supplies the ternary phase shift keying modulator with the first and the second multiplexed signals.