Digital signal transmitting apparatus

摘要

A digital signal transmitting apparatus that prevents occurrences of highness and lowness in error tolerance due to bit positions without raising the redundancy and without retransmittal. In the digital signal transmitting apparatus, a bit interchanging part (103) uses rate match information (105) to interchange bit positions such that a bit inserted by a rate match part (102) is placed at the bit position of a low error tolerance in a single symbol to be multilevel modulated. Moreover, the bit interchanging part (103) also uses the rate match information (105) to interchange bit positions such that another encoded bit, in which the bit punctured by the rate match part (102) is the same as the bit prior to encoding thereof, is placed at a bit position of a high error tolerance in a single symbol to be multilevel modulated.