turbo码的编解码程序，采用max-log-map算法，简单易用。程序采用QPSK调制，信道为AWGN-turbo code decoding process, using max-log-map algorithm, easy to use. Program uses QPSK modulation, AWGN channel is

This matlab code describes soft demapper (soft bit) for different modulation types: BPSK, QPSK, PSK 8, QAM 16, QAM 64, which are considered for turbo encoding/decoding. And simulation results are also presented.