Patent ID: 7233630

Claim:
A receiving apparatus, comprising: a receiving portion for receiving a quadrature baseband signal including both a first modulation signal obtained by modulating first data in a multi-value modulation system and a second modulation signal obtained by modulating second data in a second modulation system and regularly inserted into the first modulation signal such that the first modulation signal is arranged based on arrangement of the second modulation signal in the quadrature baseband signal, a channel distortion estimating portion for extracting the second modulation signal from the quadrature baseband signal received by the receiving portion, estimating a channel distortion by using only the second modulation signal, and outputting a channel distortion estimation signal indicating the estimated channel distortion; a first demodulating portion for extracting the first modulation signal from the quadrature baseband signal, demodulating the first modulation signal on the basis of the second modulation signal by using the channel distortion estimation signal of the channel distortion estimating portion to obtain first demodulated data, and outputting the first demodulated data; and a second demodulating portion for extracting the second modulation signal from the quadrature baseband signal, demodulating the second modulation signal to obtain second demodulated data, and outputting the second demodulated data.