/usr/share/octave/packages/communications-1.1.1/qammod.m is in octave-communications-common 1.1.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | ## Copyright (C) 2007 Sylvain Pelissier <sylvain.pelissier@gmail.com>
##
## 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} qammod (@var{x},@var{m})
## Create the QAM modulation of x with a size of alphabet m.
## @seealso{qamdemod,pskmod,pskdemod}
## @end deftypefn
function y = qammod(x,m)
if(nargin < 2)
usage('y = qammod(x,m)');
exit;
end
if(any(x >= m))
error('values of x must be in range [0,M-1]');
exit;
end
if(~any(x == fix(x)))
error('values of x must be integer');
exit;
end
c = sqrt(m);
if(c ~= fix(c) || log2(c) ~= fix(log2(c)))
error('m must be a square of a power of 2');
exit;
end
b = -2.*mod(x,(c))+c-1;
a = 2.*floor(x./(c))-c+1;
y = a + i.*b;
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