Patent ID: 7249304
Filing Date: 2007-07-24
Classification: H03M,H04L

Abstract:
1. A forward error correction apparatus using turbo codes, comprising: a decoder for iteratively decoding an input frame on a symbol basis until an iterative decoding stop command is received under a predetermined control, and outputting an absolute reliability of symbols in the frame and a-prior information and extrinsic information for the symbols; a measurement detector for detecting a minimum of the absolute reliabilities as a measurement; a threshold detector for detecting a threshold comprising a number of different signs of a-priori information and extrinsic information for the symbols wherein the threshold detector comprises an OR gate for performing logical OR-operation on the signs of the a-priori information with the signs of the extrinsic information, a counter for receiving a signal from the OR gate and counting a number of the different signs between the a-priori information and the extrinsic information and a multiplier for multiplying the counted number of different signs from the counter by a compensation value according to quantization of the symbols input to the decoder; a comparator for comparing the measurement with the threshold; and a controller for receiving a comparison result from the comparator and outputting the iterative decoding stop command according to the comparison result.