1. A receiving apparatus comprising: a detection section that performs envelope detection of an on-off keying modulated signal sequence to obtain a detected signal sequence, the on-off keying modulated signal sequence being obtained by performing on-off keying of a known channel estimation sequence formed with data 0 and 1; an extracting section that extracts only a detected signal corresponding to data 1 from the detected signal sequence to obtain an extracted signal sequence; a correlation section that calculates a correlation between the extracted signal sequence and the channel estimation sequence; and an estimation section that estimates a channel characteristic based on a result of the correlation calculation.