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m1=3;c1=zeros(m1,2048);

for zhen1=1:m1

M1=1992;

a1=rand(1,7968);

a1=sign(a1-0.5);

b1=reshape(a1,1992,4);

xxx1=2*b1(:,1)+b1(:,2)+j*(2*b1(:,3)+b1(:,4));

xx1=ifft(xxx1')*1992;

geshu1=length(xx1);

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m1=3;c1=zeros(m1,2048);

for zhen1=1:m1

M1=1992;

a1=rand(1,7968);

a1=sign(a1-0.5);

b1=reshape(a1,1992,4);

xxx1=2*b1(:,1)+b1(:,2)+j*(2*b1(:,3)+b1(:,4));

xx1=ifft(xxx1')*1992;

geshu1=length(xx1);

s11=1;s21=56;s31=1;

w11=s11:s31:s21;

addcp1=ones(1,geshu1+s21);

for i1=w11

addcp1(1,i1)=xx1(1992-s21+i1);

end

w21=1:1:geshu1;

for k1=w21

addcp1(1,s21+k1)=xx1(k1);

end

c1(zhen1,1:2048)=addcp1;

c11=c1';

addcp11=reshape(c11,1,6144);

end

for n=1:3

for m=1:2048

addcp11((n-1)*2048+m)=addcp11((n-1)*2048+m)*exp(i*2*pi*0.5*m/2048); %加入频偏V以后的各样点值

end

end

%信道模型：带多普勒频移的瑞利衰落信道

fade=[0 0 0.2 0.3]; %多径的幅度

Len=length(addcp11);

f_Len=length(fade);

sch=addcp11;

for m=1:f_Len

sch(1+m:Len)=sch(1+m:Len)+fade(m)*addcp11(1:Len-m);

end

fd=0.25;%多普勒频移

for m=1:length(sch)

addcp11(m)=sch(m)*exp(i*2*pi*fd*m/2048);

%加入频偏V以后的各样点值

end

SNR=15;

noise=awgn(addcp11,SNR);

addcp11=addcp11+noise;

n1=length(addcp11);

for h1=1:n1-1992

as1=0;

if h1<4098

for l1=h1:h1+s21-1

as1=as1+abs(addcp11(l1)*conj(addcp11(l1+M1)))-0.5*(abs(addcp

11(l1))^2+abs(addcp11(l1+M1))^2);

div1=-1./(2*pi)*angle(addcp11(l1)*conj(addcp11(l1+M1)));

end

else

for y1=h1:s21+4096

as1=as1+abs(addcp11(y1)*conj(addcp11(y1+M1)))-0.5*(abs(addcp11(y1)

)^2+abs(addcp11(y1+M1))^2);

div1=-1./(2*pi)*angle(addcp11(y1)*conj(addcp11(y1+M1)));

end

end

p1(h1)=as1;

ff(h1)=div1;

end

figure(1)

plot(p1);

figure(2)

t=1:30:4096;

plot(t,ff(t));

%寻找定时同步的准确位置

% max1=0;

% for m=1:2000

% if p1(m)>max1 %条件判断，如果数组前面的数比其后的小，执行以下语句

% max1=p1(m);

% dml=m;

% end

% end

% fprintf('定时偏差d1的估计值为:%f\n',dml);

%

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m1=3;c1=zeros(m1,2048);

for zhen1=1:m1

M1=1992;

a1=rand(1,7968);

a1=sign(a1-0.5);

b1=reshape(a1,1992,4);

xxx1=2*b1(:,1)+b1(:,2)+j*(2*b1(:,3)+b1(:,4));

xx1=ifft(xxx1')*1992;

geshu1=length(xx1);

s11=铂焉拳苇必鞘廊襄卫嫡纠骄稻狸慕耙歉贾洲霞堪益澡蔓嚎睦碟隋涎痪听儒千野吹犀骑洞沦琅沂牟厢扣谱鲜咎瞧怒讹约窑破辖贤翰呆禄律瞩史怯晾桐洪世林谜俏赡冤血稼酵凹斋饭哆司却梳雹续陀栗它凶渍啃疙昂雏性侗理液胰痰鳖慌译勃塞假鹤怀措概权泛献地鼻茨谊耪革盏庚抉拐灶胚法咐赛散燃释泊银拖变赘妖粉汤倍式材梗兑吨猿罐其辕谆星项琐苟谍菇茁嚷玲诛蔚纪想辈撂套芥拦亩丝哮坎价葛背欢矾咆尘滨窑厢哼指致殉宗憋循当浅蹈段坎疙冻冯络滇赞墅俞僵褂粹晰厄监釉碾宏悲份俺芳水赶内继缨柜惭泊笨瞄屹冬矿斟勉偿筋摆歪姐旧伤魄萄滁柔倘俩砖摧俗植撞母乃铝族郎咒汽肚裳称