clear?all;
clc;

k?=?54000;
n=0.001;
dbzy=15;
timestep=0.0000001;
ncy=?30;
tcy=ncy*timestep
fcy=1/tcy;
alltime?=?0;
ntime=-1;
stepdbzy=0.1;

%?t?=?0:timestep:n*pi;
%?x?=?sin（k*2*pi*t）;?%?Create?sawtooth?signal.
%?y?=?awgn（xdbzy‘measured‘）;?%?Add?white?Gaussian?noise.
%?plot（txty）?%?Plot?both?signals.
%?legend（‘Original?signal‘‘Signal?with?AWGN‘）;
%?title（‘帶有高斯白噪聲的回波信號‘）;
%?xlabel（‘時間t?（seconds）‘）;
%?ylabel（‘幅度‘）;

t?=?0:timestep:n*pi;
x?=?sin（k*2*pi*t）;
xx?=?0;

????
????
??
????y?=?awgn（xdbzy‘measured‘）;?%?Add?white?Gaussian?noise.
????for?i=1:ncy:l