Ngy 10 thng 4 nm 2014 Project: M phng OFDM s dng Matlab

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Din n in T Vin Thng v H Thng Mng X l tn hiu v truyn thng k thut s Project: M phng OFDM s dng Matlab

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20-02-13 16:02

Project: M phng OFDM s dng Matlab

em ang lm project ny m tm hiu cc thng tin v OFDM m cm thy m h qu, ai hng dnem lm bi ny vi, thank cc bc

CH TNG T:Khng th Build Project- Deploytool ca Matlab[help] OFDM v gi lp bng matlabOFDM trong wifi, m phng matlabTm ti liu ting vit v OFDM

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20-09-13 11:24

gi bn code m mnh vit.mnh m phng trong trng hp m hnh knh ch c fadingci ny bn c th thy rng t l li bit khng c ci thin nhiu lm v ofdm n c th chng linhiu ISI.mnh cha hiu lm v knh fading nn cha m phng, bn c th da vo ci ny pht trin lnknh fading% truyen dan ofdm% su dung dieu che 16 QAM% cp=1/4, cai nay minh se khong mo phong ve toc do% vi khi mo phong toc do khong quan trong lam.% so diem IFFT/FFT=64%fc= 200 Hclear allclcclose allN=10^6; %so bit mo phongn= 64; %so diem fft va ifftx= randsrc(1,N,[-3 -1 1 3]) + j*randsrc(1,N,[-3 -1 1 3]);scatterplot(x);title('chom sao tin hieu')%bien doi noi tiep song songa=64*ceil(N/64) - N;a1= ones(1,a);x1=[x a1]; % them cac bit 0 vao cuoi tin hieux1=reshape(x1,64,ceil(N/64)); % tao ma tran 64 hang , va N/64 cot% bien doi ifftfor ii= 1:size(x1,2)a= x1(:,ii);b=ifft(a,64);y(:,ii)=b;end% chen cpcp=1/4;cp=cp*n;for ii=1:size(y,2)a=y(:,ii);b=a(size(y,1)- cp +1:size(y,1));y1(:,ii)=b;endy=[y1;y];

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Ngy 10 thng 4 nm 2014 Project: M phng OFDM s dng Matlab

http://www.dientuvietnam.net/forums/xu-ly-tin-hieu-va-truyen-thong-ky-thuat-so-119/project-mo-phong-ofdm-su-dung-matlab-163115/ 2/3

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y=[y1;y];% ve ky hieu dau tienn=size(y,1);t=1:n;figure(2)subplot(2,1,1)plot(t(1:cp),real(y((1:cp),1)),'r',t(cp+1:n),real( y(cp+1:n,1)),'b');title('phan thuc ky hieu ofdm thu nhat')legend('phan cp','ky hieu ofdm chua chen cp')subplot(2,1,2)plot(t(1:cp),imag(y((1:cp),1)),'r',t(cp+1:n),imag( y(cp+1:n,1)),'b');title('phan thuc ky hieu ofdm thu nhat')legend('phan cp','ky hieu ofdm chua chen cp')% kenh truyen% chuyen doi song song noi tiep[a1 b1]= size(y);y=reshape(y,1,a1*b1);% gia su dang truyen trong tin hieu bang goc,% neu can co the nhan phia truyen voi exp(-j*2*pi*fc*t)%phia thu nhan voi exp(-j*2*pi*fc*t)% cong nhieu awgnsnr=linspace(5,15,7);% SNR don vi dBfor ii=1:length(snr) y1=awgn(y,snr(ii),'measured');%cong nhieu%bien doi noi tiep thanh song songy3=reshape(y1,a1,b1);%loai bo cpy4=y3(cp+1:size(y3,1), ;% bien doi fftfor iii=1:size(y4,2)sig= y4(:,iii);sig=fft(sig,64);re(:,iii)=sig;endre;[a b]= size(re);% bien doi song song thanh noi tiepres=reshape(re,1,a*b);%loai bo cac so 0 da them vao ban daures=res(1:N);% khoi phuc tin hieures=round(res);% dem bit loin_err=0;hat=res-x;for i=1:length(hat)if abs(hat(i)) ~= 0n_err=n_err+1;endendber(ii)=n_err/N;endfigure(3)semilogy(snr,ber,'-*r')

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Ngy 10 thng 4 nm 2014 Project: M phng OFDM s dng Matlab

http://www.dientuvietnam.net/forums/xu-ly-tin-hieu-va-truyen-thong-ky-thuat-so-119/project-mo-phong-ofdm-su-dung-matlab-163115/ 3/3

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