number of error in bch code

I have a problem with this program , that for increase of snr the number of error don't decrease !!! bch(n=15,k=5,t=3)

 clc;clear all;close all;
 t_error=0;
 noe=1000;
 snr=2;
 msg=double(rand(1,10000*5)>0.5);
 msg_1=vec2mat(msg,5);
 code=bchenc(gf(msg_1),15,5);
 code_double=double(code.x);
 noise=vec2mat(randn(1,150000)*sqrt(15/5)*(1/sqrt(2*snr)),15);
 noisycode=code_double+noise;
 code_1=sign(noisycode);
 code_2=(code_1+1)/2;
 [decode,numerr,ccode]=bchdec(gf(code_2),15,5);
 r=double(decode.x);
 noe1=nnz(r-msg_1);