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BPSK调制 

%此段代码实现信号的BPSK调制%输入x取值为0 1 输出y为1 -1function [y]=modbpsk(x)mapping=[1 -1];y=mapping(x(:,:)+1);

QPSK调制 

%此段代码实现信号的QPSK调制%输入x为0 1 2 3  输出y为1-1i -1+1i 1+1i -1-1ifunction [y]=modqpsk(x)mapping=[1-1i -1+1i 1+1i -1-1i];y=mapping(x(:,:)+1);

BPSK解调

function [yhat]=demodbpsk(x)map=modbpsk([0 1]);for loop=1:length(map)distance=abs(x-map(loop));all_distance(loop,:)=distance;end[~,index]=min(all_distance);mapping=[0 1];yhat=mapping(index);

QPSK解调

function [yhat]=demodbpsk(x)map=[1+1i -1+1i -1-1i 1-1i];for loop=1:length(map)distance=abs(x-map(loop));all_distance(loop,:)=distance;end[~,index]=min(all_distance);mapping=[0 1 2 3];yhat=mapping(index);

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