Patent ID: 8345800

Claim:
A receiver apparatus comprising: a sampler circuit that samples a signal that has been subject to frequency division multiplexing modulation to convert the signal from a continuous time signal to a discrete time signal; a discrete time filter that receives the discrete time signal output from the sampler circuit and attenuates one or more subcarrier frequency components different from a frequency component of a specified subcarrier; and a demodulation unit that extracts a digital baseband signal from a signal that has passed through the discrete time filter, the demodulation unit completing a demodulation operation within one data symbol reception period, and wherein after a frequency of one subcarrier has been passed and then the remainder of subcarrier frequency components have been attenuated by the discrete time filter, a baseband signal included in the one subcarrier is read to complete demodulation of the one subcarrier, and then, a sampling clock frequency is switched, a frequency characteristic of the discrete time filter is switched so that a frequency component of a subcarrier different from the frequency of the one subcarrier is passed and the remainder of subcarrier frequency components is attenuated and then a baseband signal included in the different subcarrier is read by the demodulation unit to complete demodulation of the different subcarrier.