Abstract
An iterative decoding device applied for a SISO (soft input soft output) system is disclosed and comprises an operational control unit, a first decoder and a second decoder. The operational control unit is operative to receive each encoded signal and divide the encoded signal into at least two frames. The first decoder is operative to receive each of the frames and derive renewed instinct information by a first iteration operation. The second decoder is operative to derive soft information by a second iteration operation based on the renewed instinct information, and then transmit the soft information back to the first decoder for the next iteration operation of the renewed instinct information. The operational control unit makes the at least two frames be calculated respectively by the first decoder and the second decoder at the same cycle period, then improving the efficiency and error ratio of a receiving terminal.