deinterleaver.m

802.15 dsss 物理协议层方针代码

function deinterleaved_output=deinterleaver(input)
%Deinterleaver
%
%deinterleaving is used to recover the encoded bits after interleaving
%
%DS-UWB PHY 802.15
%
%Author: Liu Hantao
%
%==============================================================
%check the input arguments
if (nargin ~= 1) 
    error('incorrect number of input arguments - one expected')
end
n=length(input)/10;
%==============================================================
%generate 9 registers for deinterleaving
J=7;
ret1=zeros(1,9*J);
ret2=zeros(1,8*J);
ret3=zeros(1,7*J);
ret4=zeros(1,6*J);
ret5=zeros(1,5*J);
ret6=zeros(1,4*J);
ret7=zeros(1,3*J);
ret8=zeros(1,2*J);
ret9=zeros(1,J);
%==============================================================
%start the deinterleaving
for i = 0:n-1    
    deinterleaved_output(10*i+1)=ret1(9*J);
    ret1=[input(10*i+1),ret1(1:9*J-1)];
    
    deinterleaved_output(10*i+2)=ret2(8*J);
    ret2=[input(10*i+2),ret2(1:8*J-1)];
    
    deinterleaved_output(10*i+3)=ret3(7*J);
    ret3=[input(10*i+3),ret3(1:7*J-1)];
    
    deinterleaved_output(10*i+4)=ret4(6*J);
    ret4=[input(10*i+4),ret4(1:6*J-1)];
    
    deinterleaved_output(10*i+5)=ret5(5*J);
    ret5=[input(10*i+5),ret5(1:5*J-1)];
    
    deinterleaved_output(10*i+6)=ret6(4*J);
    ret6=[input(10*i+6),ret6(1:4*J-1)];
    
    deinterleaved_output(10*i+7)=ret7(3*J);
    ret7=[input(10*i+7),ret7(1:3*J-1)];
    
    deinterleaved_output(10*i+8)=ret8(2*J);
    ret8=[input(10*i+8),ret8(1:2*J-1)];
    
    deinterleaved_output(10*i+9)=ret9(J);
    ret9=[input(10*i+9),ret9(1:J-1)];
    
    deinterleaved_output(10*i+10)=input(10*i+10);
end
%==============================================================
%Post- processing of the deinterleaved output data
%There should be 630 zeros ahead of  the deinterleaved output data
%cut off these zeros
deinterleaved_output=deinterleaved_output(631:length(deinterleaved_output));