bpsk.m
上传用户:m_sun_001
上传日期:2014-07-30
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文件大小:3k
- % Program 3-1
- % bpsk.m
- %
- % Simulation program to realize BPSK transmission system
- %
- % Programmed by H.Harada and T.Yamamura,
- %
- %******************** Preparation part **********************
- sr=256000.0; % Symbol rate
- ml=1; % Number of modulation levels
- br=sr.*ml; % Bit rate (=symbol rate in this case)
- nd = 1000; % Number of symbols that simulates in each loop
- ebn0=3; % Eb/N0
- IPOINT=8; % Number of oversamples
- %******************* Filter initialization ********************
- irfn=21; % Number of filter taps
- alfs=0.5; % Rolloff factor
- [xh] = hrollfcoef(irfn,IPOINT,sr,alfs,1); %Transmitter filter coefficients
- [xh2] = hrollfcoef(irfn,IPOINT,sr,alfs,0); %Receiver filter coefficients
- %******************** START CALCULATION *********************
- nloop=100; % Number of simulation loops
- noe = 0; % Number of error data
- nod = 0; % Number of transmitted data
- for iii=1:nloop
-
- %******************** Data generation ********************************
- data=rand(1,nd)>0.5; % rand: built in function
- %******************** BPSK Modulation ***********************
- data1=data.*2-1;
- [data2] = oversamp( data1, nd , IPOINT) ;
- data3 = conv(data2,xh); % conv: built in function
- %****************** Attenuation Calculation *****************
-
- spow=sum(data3.*data3)/nd;
- attn=0.5*spow*sr/br*10.^(-ebn0/10);
- attn=sqrt(attn);
-
- %********************** Fading channel **********************
- % Generated data are fed into a fading simulator
- % In the case of BPSK, only Ich data are fed into fading counter
- % [ifade,qfade]=sefade(data3,zeros(1,length(data3)),itau,dlvl,th1,n0,itnd1,now1,length(data3),tstp,fd,flat);
-
- % Updata fading counter
- %itnd1 = itnd1+ itnd0;
- %************ Add White Gaussian Noise (AWGN) ***************
-
- inoise=randn(1,length(data3)).*attn; % randn: built in function
- data4=data3+inoise;
- data5=conv(data4,xh2); % conv: built in function
- sampl=irfn*IPOINT+1;
- data6 = data5(sampl:8:8*nd+sampl-1);
-
- %******************** BPSK Demodulation *********************
- demodata=data6 > 0;
- %******************** Bit Error Rate (BER) ******************
- noe2=sum(abs(data-demodata)); % sum: built in function
- nod2=length(data); % length: built in function
- noe=noe+noe2;
- nod=nod+nod2;
- fprintf('%dt%en',iii,noe2/nod2);
- end % for iii=1:nloop
- %********************** Output result ***************************
- ber = noe/nod;
- fprintf('%dt%dt%dt%en',ebn0,noe,nod,noe/nod);
- fid = fopen('BERbpsk.dat','a');
- fprintf(fid,'%dt%et%ft%ftn',ebn0,noe/nod,noe,nod);
- fclose(fid);
- %******************** end of file ***************************
-