function?[code_spreadplot_sigPe_simuPe_theo]=BPSK（N_loop）
%--------------------------------------------------------------
%??Completed?date:2009.5.20
%??By?LiMing?Student?ID:0808120161
%--------------------------------------------------------------
%?Time?domain?curves?and?BER?curve?are?the?output
code_len=20;
%?N_loop=10;
fre=2;
fs=50*fre;
T=1/fre;
for?SNR=0:10
????eRate=0;
????for?i=1:N_loop
????????code=randint（1code_len）;?%{01}data
????????code_spread=[];
????????for?ii=1:length（code）
????????????if?code（ii）==1
????????????????code_spread=[code_spread?ones（1fs*T）];
????????????else
????????????????code_spread=[code_spread?zeros（1fs*T）];
????????????end
????????end
????????tt=1/fs:1/fs:（code_len*T）;
????????sig=cos（2*pi*fre*tt）.*（code_spread*2-1）;
????????plot_sig=sig;
????????Eb=sum（（abs（sig））.^2）/code_len;
????????No=Eb/（10^（SNR/10））;
????????noise=randn（size（sig））.*sqrt（No/2）;?
????????sig=sig+noise;
????????r=reshape（sigfs*Tcode_len）‘;
????????local1=cos（2*pi*fre*[1/fs:1/fs:T]）;
????????local0=cos（2*pi*fre*[1/fs:1/fs:T]+pi）;
????????decode=[];
????????for?ii=1:code_len
????????????test1=sum（local1.*r（ii:））;
????????????test0=sum（local0.*r（ii:））;
????????????if?test1>0
????????????????decode=[decode?1];
????????????else
????????????????decode=[decode?0];
????????????end
????????end
????????eRate=eRate+sum（code~=decode）/code_len;
????end
????Pe_simu（SNR+1）=eRate/N_loop;
????Pe_theo（SNR+1）=0.5*erfc（sqrt（10.^（SNR/10）））;
end

?屬性????????????大小?????日期????時(shí)間???名稱
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?????文件???????1462??2009-06-08?09:03??BER?with?GUI\BPSK.m

?????文件???????4147??2009-06-08?10:25??BER?with?GUI\mygui.fig

?????文件???????3356??2009-06-08?10:12??BER?with?GUI\mygui.m

?????文件???????2277??2009-05-29?14:04??BER?with?GUI\QPSK.m

?????文件????????496??2009-06-08?10:14??BER?with?GUI\smile.m

?????目錄??????????0??2009-06-09?14:56??BER?with?GUI

?????文件????????183??2009-02-02?09:47??Matlab中文論壇--助努力的人完成畢業(yè)設(shè)計(jì).url

?????文件???????3543??2009-02-01?16:19??使用幫助：新手必看.htm

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