Patent ID: 7500169
Filing Date: 2009-03-03
Classification: H03M

Abstract:
1. A turbo decoder operating as a sliding window turbo decoder comprising: a first decoding unit to divide an input code block into a plurality of windows and to perform forward processing and backward processing on the obtained windows; a second decoding unit to perform forward processing and backward processing on outputs from said first decoding unit; an iteration controlling unit to control so as to perform decoding processing to be performed by said first and second decoding units in an iterated manner; a training unit to provide training of calculations of an initial value to be used for calculations of a path metric value in a backward direction in said backward processing; an error detecting unit to make an error inspection of decoding output of said second decoding unit; and a size controlling unit to control so that a training size of a window in said training unit is adjusted according to a detected result of said error inspection from said error detecting unit.