qdpsk程序matlab

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1、Matlab程序：%-----------------------------QDPSK----------------------------------clearall;closeall;clc;%---------------------------------------------------------------------%参数设置Fc=5e6;data_len=10000;%---------------------------------------------------------------------%随机产生传输信号rand_data_len=rand

2、n(1,data_len);fori=1:data_lenifrand_data_len(i)>=0.5input(i)=1;elseinput(i)=0;endend%---------------------------------------------------------------------%串并转换fori=1:data_lenifrem(i,2)==1ifinput(i)==1I(i)=-1;I(i+1)=-1;elseI(i)=1;I(i+1)=1;endelseifinput(i)==1Q(i-1)=-1;Q(i)=-1;elseQ(i-1)=1;Q(i)=

3、1;endendend%---------------------------------------------------------------------%码变换I_diff=zeros(1,data_len);Q_diff=zeros(1,data_len);I_diff(1)=I(1);Q_diff(1)=Q(1);fori=2:data_lenifI(i)==1&&Q(i)==1%0->+11->-1ifI_diff(i-1)==1&&Q_diff(i-1)==1I_diff(i)=1;Q_diff(i)=1;elseifI_diff(i-1)==-1&&Q_diff

4、(i-1)==1I_diff(i)=-1;Q_diff(i)=1;elseifI_diff(i-1)==-1&&Q_diff(i-1)==-1I_diff(i)=-1;Q_diff(i)=-1;elseI_diff(i)=1;Q_diff(i)=-1;endelseifI(i)==-1&&Q(i)==1ifI_diff(i-1)==1&&Q_diff(i-1)==1I_diff(i)=-1;Q_diff(i)=1;elseifI_diff(i-1)==-1&&Q_diff(i-1)==1I_diff(i)=-1;Q_diff(i)=-1;elseifI_diff(i-1)==-1&

5、&Q_diff(i-1)==-1I_diff(i)=1;Q_diff(i)=-1;elseI_diff(i)=1;Q_diff(i)=1;endelseifI(i)==-1&&Q(i)==-1ifI_diff(i-1)==1&&Q_diff(i-1)==1I_diff(i)=-1;Q_diff(i)=-1;elseifI_diff(i-1)==-1&&Q_diff(i-1)==1I_diff(i)=1;Q_diff(i)=-1;elseifI_diff(i-1)==-1&&Q_diff(i-1)==-1I_diff(i)=1;Q_diff(i)=1;elseI_diff(i)=-1

6、;Q_diff(i)=1;endelseifI_diff(i-1)==1&&Q_diff(i-1)==1I_diff(i)=1;Q_diff(i)=-1;elseifI_diff(i-1)==-1&&Q_diff(i-1)==1I_diff(i)=1;Q_diff(i)=1;elseifI_diff(i-1)==-1&&Q_diff(i-1)==-1I_diff(i)=-1;Q_diff(i)=1;elseI_diff(i)=-1;Q_diff(i)=-1;endendend%-----------------------------------------------------

7、----------------%零内插zero=5;%采样率为25MHzfori=1:zero*data_lenifrem(i,zero)==1Izero(i)=I_diff(fix((i-1)/zero)+1);Qzero(i)=Q_diff(fix((i-1)/zero)+1);elseIzero(i)=0;Qzero(i)=0;endend%------------------------------------------------------------