oqpsk.m
上传用户:m_sun_001
上传日期:2014-07-30
资源大小:1115k
文件大小:3k
- % Program 3-11
- % oqpsk.m
- %
- % Simulation program to realize OQPSK transmission system
- %
- % Programmed by H.Harada and T.Yamamura
- %
- %******************** Preparation part *************************************
- sr=256000.0; % Symbol rate
- ml=2; % ml:Number of modulation levels (BPSK:ml=1, QPSK:ml=2, 16QAM:ml=4)
- br=sr.*ml; % bit rate
- 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 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 ********************************
- data1=rand(1,nd*ml)>0.5; % rand: built in function
- %*************************** OQPSK Modulation ********************************
-
- [ich,qch]=qpskmod(data1,1,nd,ml);
- [ich1,qch1]=compoversamp(ich,qch,length(ich),IPOINT);
- ich21=[ich1 zeros(1,IPOINT/2)];
- qch21=[zeros(1,IPOINT/2) qch1];
- [ich2, qch2]=compconv(ich21,qch21,xh);
-
- %**************************** Attenuation Calculation ***********************
- spow=sum(ich2.*ich2+qch2.*qch2)/nd; % sum: built in function
- attn=0.5*spow*sr/br*10.^(-ebn0/10);
- attn=sqrt(attn); % sqrt: built in function
-
- %********************** Fading channel **********************
-
- % Generated data are fed into a fading simulator
- % [ifade,qfade]=sefade(ich2,qch2,itau,dlvl,th1,n0,itnd1,now1,length(ich1),tstp,fd,flat);
-
- % Updata fading counter
- %itnd1 = itnd1+ itnd0;
- %********************* Add White Gaussian Noise (AWGN) **********************
-
- [ich3,qch3]= comb(ich2,qch2,attn);% add white gaussian noise
- [ich4,qch4]= compconv(ich3,qch3,xh2);
- syncpoint=irfn*IPOINT+1;
- ich5=ich4(syncpoint:IPOINT:length(ich4));
- qch5=qch4(syncpoint+IPOINT/2:IPOINT:length(qch4));
-
- %**************************** OQPSK Demodulation *****************************
-
- [demodata]=qpskdemod(ich5,qch5,1,nd,ml);
- %************************** Bit Error Rate (BER) ****************************
- noe2=sum(abs(data1-demodata)); % sum: built in function
- nod2=length(data1); % length: built in function
- noe=noe+noe2;
- nod=nod+nod2;
- fprintf('%dt%en',iii,noe2/nod2); % fprintf: built in function
- end % for iii=1:nloop
- %********************** Output result ***************************
- ber = noe/nod;
- fprintf('%dt%dt%dt%en',ebn0,noe,nod,noe/nod); % fprintf: built in function
- fid = fopen('BERoqpsk.dat','a');
- fprintf(fid,'%dt%et%ft%ftn',ebn0,noe/nod,noe,nod); % fprintf: built in function
- fclose(fid);
- %******************** end of file ***************************