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35 lines
1.1 KiB
Matlab
35 lines
1.1 KiB
Matlab
11 years ago
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N=128; %128 subcarries
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M=16; %QAM order
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cp=9; %length of the cyclic prefix... Is increasing the cyclic prefix size gonna increase the efficiency?
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scale = 1/sqrt(10);
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hMod = modem.qammod(M); %QAM Modulator
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hDemod = modem.qamdemod(hMod); %QAM demodulator
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loops = 10;
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SNR =0:5:35;
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t1= cputime ;
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% transmited signal. Contains N data points ranging from 0 to M-1
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ber=zeros(5,length(SNR));
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%% Creating the Rayleigh Multipath Channels
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Ch = rayleighchan(1/1000,10);
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Ch.ResetBeforeFiltering = 0;
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sig = 1i*ones(loops,1);
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h1 = filter(Ch,sig);
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h2 = 0.1072*filter(Ch,sig);
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h3 = 0.0120*filter(Ch,sig);
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h4 = 0.0052*filter(Ch,sig);
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% Delay Values
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l1 = 4;
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l2 = 7;
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l3= 16;
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%%
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ofdm_cp=[];
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%tx=transmited_data;
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for ik=1:loops%number of loops
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tx = randi([0 M-1],1,N); % generate random data
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sig=modulate(hMod, tx)*scale; % Modulate QAM modulated signal, devide by the square root of 10 to bring the average power of the signal to 1
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ofdm=sqrt(N).*ifft(sig,N); % generate OFDM signal IFFT on the parrellel data,multiply by sqrt(N) to adjust to the matlab computation ,
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ofdm_cp = [ofdm_cp ofdm(N-cp+1:N) ofdm]; % Add cyclic prefix
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end
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