manche_molding.m

曼彻斯特编码

%%%%%%%%%%%%%%%%%%%%%   此函数为生成曼彻斯特码元  %%%%%%%%%%%%%%%%%%%%
function manchester=manche_molding(sequence,points_num)  %%%%  sequence为输入的码元序列，points_num为一个码元的采样点数
  
seq_len=length(sequence);

% ----------------------------
% Step Zero - 将输入序列中的正数变为1，将0和负数变为-1
% ----------------------------
for i=1:seq_len
    if sequence(i)<=0
        sequence(i)=-1;
    elseif sequence(i)>0
        sequence(i)=1;
    end;
end;

% ----------------------------
% Step One -  生成曼彻斯特码元模板
% ----------------------------
for i=1:floor(points_num/2)
       manche_molding(i)=1;
end;
for i=floor(points_num/2)+1:points_num
        manche_molding(i)=-1;
end;

% ----------------------------
% Step Two -  生成最终结果，每个曼彻斯特码长度为points_num
% ----------------------------
for i=1:seq_len
    for j=1:points_num
        result_code((i-1).*points_num+j)=sequence(i).*manche_molding(j);
    end;
end;

% ----------------------------
% Step Three -  返回值
% ----------------------------
manchester=result_code;     %返回曼彻斯特码