Apparatus and method for reducing bit error rate and frame error rate using turbo decoding in digital communication system

摘要

In a communication system, and method (FEC) unit forward error correction to reduce the frame error rate and bit error rate by using a turbo decoding. The configuration decoding apparatus for decoding a turbo code, when performing turbo decoding of the information symbols received at any time, is 0 information symbol with the maximum metric value is 1 information symbols turbo decoding trellis a second adder for adding a first adder for calculating the difference between the maximum metric value, prior information and transmission information to the information symbols, the difference between the outputs of the second adder and the first adder a first multiplier multiplying the predetermined weights having a value of the feedback gain and the third adder to output as additional information by computing, at the output of the third adder, and the maximum for the information symbols received includes a correction value calculation unit calculating a correction value using the difference between the metric value, the second largest and the metric value, and a fourth adder for adding the output of the multiplier of the first correction value.