QPSK\code.mat ....\G.mat ....\G_225.mat ....\G_4283_5256.mat ....\H2.mat ....\H2_225.mat ....\H2_4283_5256.mat ....\llr.mat ....\main.m ....\main2.m ....\main_v3.m ....\qpsk_uncoded.fig ....\soft_demap_qpsk.m ....\SPA_decoder.m QPSK