scrambler.m

来自「OFDM的PHY发射端matlab实现程序」· M 代码 · 共 30 行

function [dataout,P127seq]=scrambler(datain)
% datain:  input data sequence
% datamid :a middle variance which keep the
% X(7) xor X(4)
% dataout1:keep the output
% dataout: outout data sequence
datamid=0;
dataout=[];
dataout1=[];
%S=[ones(1,7)];
S=[1 0 1 1 1 0 1];
for j=1:length(datain)
    if datain(j)==datamid
        dataout1(j)=0;
    else dataout1(j)=1;
    end
   for i=1:6                      %循环移位
     S(8-i)=S(7-i);  
   end
   S(1)=datamid;
   if S(4)==S(7)                  %逻辑异或
       datamid=0;
   else datamid=1;
   end
end
dataout=dataout1;