Cedric Roux
56c66c09aa
Pre-ci test passed git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4000 818b1a75-f10b-46b9-bf7c-635c3b92a50f
44 lines
868 B
Matlab
Executable File
44 lines
868 B
Matlab
Executable File
function out=rx_post(nom)
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%load data.dat signal
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%fid=fopen('/tmp/store1.dat',)
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fid=fopen(nom,'rb')
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signal=fread(fid,20480*2,'float');
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signal=signal(1:2:length(signal))+j*signal(2:2:length(signal));
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disp(signal(1:10));
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size_data=20480/2;
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Fs=7680; %in kHz
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band = 2000; %in kHz
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max_pos=0;
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max=0;
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f=abs(fft(signal)).^2;
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for n=2:size_data
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if(f(n) > max)
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max=f(n);
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max_pos=n;
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end;
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end;
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disp(max_pos)
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freq_max=Fs/size_data*max_pos - Fs/2 % corresponding frequency
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if(abs(freq_max-2000)>100)
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disp("Warning")
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end;
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% calculation of the signal power
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Pu=sum(f(max_pos-20:max_pos+20))
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ns_noise =round((band/Fs)*(size_data/2))
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Pnoise=sum(f(max_pos-ns_noise:max_pos+ns_noise))-Pu
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plot(10*log10(f))
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% plot(10*log10(f(max_pos-ns_noise:max_pos+ns_noise)))
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SNR=10*log10(Pu/Pnoise)
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N_in = -174 +10*log10(1000*band)
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S_in = -110;
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SNR_in=S_in - N_in
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NF=SNR_in-SNR
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end;
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