1. A decoding method of performing maximum a posteriori probability decoding of selecting one decoded word from one or more decoded word candidates obtained by subjecting a linear code to iterative decoding by comparison of distances between a reception word and each decoded word candidate, wherein a decoded word candidate in which a known value in a part of a transmission word has been changed to another value is excluded from the one or more decoded word candidates.
1. A decoding method of performing maximum a posteriori probability decoding of selecting one decoded word from one or more decoded word candidates obtained by subjecting a linear code to iterative decoding by comparison of distances between a reception word and each decoded word candidate, wherein a decoded word candidate in which a known value in a part of a transmission word has been changed to another value is excluded from the one or more decoded word candidates. 2. The decoding method according to claim 1 , wherein a value of a synchronization byte of a transport stream packet or an inverse of the value of the synchronization byte is used as the known value in the part of the transmission word.