I've implemented the Helical and Helical Scan interleavers.
octave-forge/main/comm/inst.
I'm not a member of the octave forge project, so I've just attached
them. Enjoy.
Alternately, someone could grant me commit access. My sourceforge user
is https://sourceforge.net/users/mborg
-- Mark Borgerding
P.S. I wrote them cleanly from their function description without
looking at any Matlab copyrighted code. I did have a friend spot check a
couple test vectors against his version of Matlab.
## Copyright (C) 2010 Mark Borgerding <[email protected]>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
## -*- texinfo -*-
## @deftypefn {Function File} {...@var{outdata} =} helscanintrlv (@var{data},
@var{nrows}, @var{ncols},@var{Nshift})
## @var{nrows}-...@var{ncols}.
## @seealso{helscandeintrlv}
## @end deftypefn
function outdata = helscanintrlv(data,Nrows,Ncols,Nshift)
if(nargin ~= 4 )
error('usage : interlvd =
helscanintrlv(data,Nrows,Ncols,Nshift)');
end
if(~isscalar(Nrows) || ~isscalar(Ncols))
error("Nrows and Ncols must be integers");
end
if( Nrows ~= floor(Nrows)|| Ncols ~= floor(Ncols))
error("Nrows and Ncols must be integers");
end
didTranspose=0;
if ( isvector(data) && columns(data) > rows(data) )
data = data.';
didTranspose=1;
end
s = size(data);
if size(data,1) ~= Nrows*Ncols
error("The length of data must be equals to Ncols*Nrows");
end
# create the interleaving indices
idx0 = 0:Nrows*Ncols-1;
idxMod = rem(idx0,Ncols);
idxFlr = idx0 - idxMod;
inds = 1+rem(idxFlr + idxMod * Ncols * Nshift + idxMod,Nrows*Ncols);
# for each column
for k = 1:s(2)
outdata(:,k) = data(inds,k);
end
if didTranspose
outdata = outdata.';
end
## Copyright (C) 2010 Mark Borgerding <[email protected]>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
## -*- texinfo -*-
## @deftypefn {Function File} {...@var{outdata} =} helintrlv (@var{data},
@var{col}, @var{ngrp},@var{stp})
## @var{col}-...@var{ngrp}.
## @seealso{heldeintrlv}
## @end deftypefn
function [outdata,outstate] = helintrlv(data,col,ngrp,stp,init_state)
if (nargin < 4 ||nargin>5)
error('usage : interlvd = helintrlv(data,col,ngrp,stp)');
end
if(~isscalar(col) || ~isscalar(ngrp))
error("col and ngrp must be integers");
end
if( col ~= floor(col)|| ngrp ~= floor(ngrp))
error("col and ngrp must be integers");
end
didTranspose=0;
if ( isvector(data) && columns(data) > rows(data) )
data = data.';
didTranspose=1;
end
s = size(data);
if s(1) ~= col*ngrp
error("The length of data must be equals to ngrp*col");
end
if nargin==4
init_state = zeros(stp*col*(col-1)/2,s(2));
end
outstate =[];
# for each column
for k = 1:s(2)
tmp = reshape( data(:,k) , ngrp, col );
instate = init_state(:,k);
outstateCol=[];
for k1=2:col
curStepSize = (k1-1)*stp;
tmpCol= [instate(1:curStepSize) ;tmp(:,k1)];
tmp(:,k1) = tmpCol(1:ngrp);
outstateCol=[outstateCol;tmpCol(end+1-curStepSize:end)];
instate = instate(curStepSize+1:end);
end
outdata(:,k) = reshape(tmp.',s(1),1);
outstate = [outstate outstateCol];
end
if didTranspose
outdata = outdata.';
end
## Copyright (C) 2010 Mark Borgerding <[email protected]>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
## -*- texinfo -*-
## @deftypefn {Function File} {...@var{outdata} =} helscandeintrlv (@var{data},
@var{nrows}, @var{ncols},@var{Nshift})
## @var{nrows}-...@var{ncols}.
## @seealso{helscandeintrlv}
## @end deftypefn
function outdata = helscandeintrlv(data,Nrows,Ncols,Nshift)
outdata = helscanintrlv(data,Nrows,Ncols,Nrows-Nshift);
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