% 求多個用戶的誤碼率，調用annreceivex
%hold on
BER_sum=zeros(1,13);
BER_ave=zeros(1,13);
for m=1:10
   snr_in_db=-20:3:16;
   for i=1:length(snr_in_db)
       BER(i)=JXG(snr_in_db(i));
   end
   BER_sum=BER_sum+BER;
end;
BER_ave=0.1* BER_sum ; 
%plot(snr_in_db,BER_ave,'bd-')

%plot Pe versus SNR
semilogy( snr_in_db,BER_ave,'m*:')
%xlabel('SNR')
%ylabel('BER')
%s=sprintf('BER versus SNR in the AWGN channel');
%title(s);