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28 lines
769 B
28 lines
769 B
% ch_fading.m
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% David Rowe
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% April 2018
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% function to write float fading samples for use by C programs
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function ch_fading(raw_file_name, Fs, dopplerSpreadHz, len_samples)
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randn('seed',1);
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spread = doppler_spread(dopplerSpreadHz, Fs, len_samples);
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spread_2ms = doppler_spread(dopplerSpreadHz, Fs, len_samples);
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hf_gain = 1.0/sqrt(var(spread)+var(spread_2ms));
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printf("hf_gain: %f\n", hf_gain);
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% interleave real imag samples
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inter = zeros(1,len_samples*4);
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inter(1:4) = hf_gain;
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for i=1:len_samples
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inter(i*4+1) = real(spread(i));
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inter(i*4+2) = imag(spread(i));
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inter(i*4+3) = real(spread_2ms(i));
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inter(i*4+4) = imag(spread_2ms(i));
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end
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f = fopen(raw_file_name,"wb");
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fwrite(f, inter, "float32");
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fclose(f);
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endfunction
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