Add a useful package (from Source forge) for octave

[CreaPhase.git] / octave_packages / communications-1.1.1 / reedmullerenc.m

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+## Copyright (C) 2007 Muthiah Annamalai <muthiah.annamalai@uta.edu>
+##
+## 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 3 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, see <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Function File} {}  reedmullerenc (@var{MSG},@var{R},@var{M})
+##
+## Definition type construction of Reed Muller code,
+## of order @var{R}, length @math{2^M}. This function
+## returns the generator matrix for the said order RM code.
+## 
+## Encodes the given message word/block, of column size k, 
+## corresponding to the RM(@var{R},@var{M}), and outputs a
+## code matrix @var{C}, on each row with corresponding codeword.
+## The second return value is the @var{G}, which is generator matrix
+## used for this code.
+##
+## @example
+## @group
+## MSG=[rand(10,11)>0.5];
+## [C,G]=reedmullerenc(MSG,2,4);
+##
+## @end group
+## @end example
+## 
+## @end deftypefn
+## @seealso{reedmullerdec,reedmullergen}
+function [C,G]=reedmullerenc(MSG,R,M)
+      if ( nargin < 3 )
+         print_usage();
+      end
+     G=reedmullergen(R,M);
+     if ( columns(MSG) ~= rows(G) )
+        error('MSG size must be corresponding to (R,M) message size');
+     end
+     C=zeros(rows(MSG),2.^M);
+     for idx=1:rows(MSG)
+         C(idx,:)=mod(MSG(idx,:)*G,2);
+     end
+     return
+end