％＊*****＊＊＊****＊＊＊＊*＊＊*＊*＊*＊＊＊*＊*＊＊*＊＊**＊*＊＊＊＊******＊*＊＊*＊*＊＊＊＊＊*＊*＊＊*＊＊*＊＊***＊*＊**＊**＊% This fun ｃｔ io ｎ ｐｅ r ｔ ain ｓ ｔ o the ａ dd ｉ tion of A Ｗ GN with meaｎ ｚｅ ro a ｎｄ ％ p ａ r ａ meter ＇v ａ ri ａ nce’ t ｏ a ｎ inp ｕ t ｓｉ gnal、 %％ ＡＵ THOR: Wenbin Ｌ uo％ﻩﻩﻩ DA Ｔ E : ０ 4/1 ２/01%%ﻩ ＳＹＮ O Ｐ SIS： y = awgn（x,var）% x ——－＞ in ｐ ut sig ｎ a ｌ% ｖ ar -—－〉 ｖ a ｒ iance% y －－－> ｙ = x ＋ AWGN %＊*＊***＊＊＊＊*＊＊*＊**＊*＊***＊＊＊*＊＊*＊**＊＊*＊＊＊*＊*＊**＊**＊*＊＊＊*＊＊*＊**＊＊*＊*＊＊*＊**＊*＊*＊＊＊*＊＊＊＊fun ｃ t ｉ on y = ａ w ｇ n(x，var) ｗ ＝ ran ｄ n(1，len ｇｔ h（x））；ﻩ w = w - mean（w）＊ones（si ｚ e(w））； w = sqr ｔ（va ｒ)*（ｗ / ｓ td（w)）; x = ｘ(:）； w ＝ ｗ（：）; y = x + w； ％*＊**＊＊***＊＊＊*＊＊**＊*＊＊＊＊＊＊＊＊*＊*＊*＊**＊＊＊＊＊＊＊**＊＊**＊*****＊＊＊*＊＊*＊＊＊＊＊**＊＊＊*＊＊*＊***＊*＊*＊＊% T ｈ is f ｕ n ｃ t ｉ on d ｏ es th ｅ D Ｓ－S Ｓ modul ａ t ｉｏ n％％ Ａ U Ｔ HO Ｒ： Ｗ e ｎ bin L ｕ o%ﻩﻩ DA Ｔ E
