?? add_noise.m
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function[sigma] = add_noise(waveform, EbN0db, rate, a) % waveform is input data, EbNOdb is set by user, rate is the data rate, a is fam.
en = 10^(EbN0db/10); % convert Eb/N0 from unit db to normal numbers
L_c = 4*a*en*rate; % reliability value of the channel
sigma = 1/sqrt(2*rate*en); % standard deviation of AWGN noise?? 快捷鍵說明
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