Patent ID: 8081027

Claim:
A reception device that receives a modulation signal being a result of digital modulation of a carrier, the device comprising: a demodulation section that demodulates the modulation signal into a demodulation signal including an I component of the same phase as that of the carrier and a Q component orthogonal to the carrier; a numerically controlled oscillation section that generates a signal of predetermined phase; a phase error detection section that detects a first phase error between a phase of a symbol of the demodulation signal and the predetermined phase of the signal generated by the numerically controlled oscillation section; a phase rotation section that rotates the phase of the symbol of the demodulation signal in accordance with the phase error; a loop filter that filters a second phase error, and in accordance with a filtering result, controls the numerically controlled oscillation section; a gain storage section that stores therein a plurality of gains for an corresponding plurality of modulation techniques, at least one of the plurality of modulation techniques being used when generating the modulation signal, the stored gains being variable; and a gain control section that controls a gain of the loop filter based on at least one of the plurality of gains stored in the gain storage section.