Turbo error-correcting decoder and turbo error-correcting decoding method

摘要

In a conventional turbo error-correcting decoder, the soft-decision information is corrected by using an average value (A) and a variance value (sigma<2>) of reliability of received bits. From the reliability-corrected soft-decision information, the hard-decision information is obtained. This process of calculation is complex, giving rise to a problem of reduced processing speed and complicated circuit. To deal with this problem, an average value of reliability of received information bits is determined and then a ratio between the average value and the soft-decision information is also determined. This ratio is converted by the conversion table into the reliability-corrected soft-decision information, from which the hard-decision information is obtained.