function CtcDecode=ctcdecode(DemoduResult,type,en,niter,L1)
en=10^(EbN0(i)/10);
if type==1|type==2
    L_c=4*en*rate;%為了防止計算溢出,對于16-QAM調制,再乘一個因子(1/sqrt(10)),64-QAM乘以(1/sqrt(42))
elseif type==3|type==4
    L_c=4*en*rate/sqrt(10);
else
    L_c=4*en*rate/sqrt(42);
end
y=0.5*L_c*DemoduResult;
CtcDecode=CtcDecoder(y,niter,type,L1);