- refactored

common/radio/lfsr.m

@@ -0,0 +1,30 @@
+## Copyright (C) 2018 Jens Ahrensfeld
+## 
+## 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} {@var{retval} =} lfsr (@var{input1}, @var{input2})
+##
+## @seealso{}
+## @end deftypefn
+
+## Author: Jens Ahrensfeld <ahrensfeld@w2ess001vm>
+## Created: 2018-12-05
+
+function next = lfsr (size, poly, curr)
+
+
+next = 2*xor(curr, poly);
+
+endfunction

common/radio/manchester.m

@@ -0,0 +1,64 @@
+function y = manchester(x, type)
+N = length(x);
+
+mtype = 'ieee802.3';
+if (nargin > 1)
+	mtype = type
+end
+
+t = -1;
+v = -1;
+
+if (strcmp(mtype, 'I') || strcmp(mtype, 'ieee802.3'))
+	v = 0;
+	t = 1;
+end
+
+if (strcmp(mtype, 'II') || strcmp(mtype, 'Thomas'))
+	v = 0;
+	t = 2;
+end
+
+if (strcmp(mtype, 'BP-M'))
+	v = 1;
+	t = 1;
+end
+
+if (strcmp(mtype, 'BP-S'))
+	v = 0;
+	t = 1;
+end
+
+if (t == 1)
+	s = 1;
+	y = [];
+	for n=1:N,
+		if x(n) == v
+			s = not(s);
+			y = [y s];
+			y = [y s];
+		else
+			s = not(s);
+			y = [y s];
+			s = not(s);
+			y = [y s];
+		end
+	end
+end
+
+if (t == 2)
+	s = 1;
+	y = [];
+	for n=1:N,
+		if x(n) == v
+			y = [y not(s)];
+			y = [y s];
+		else
+			y = [y s];
+			y = [y not(s)];
+		end
+	end
+end
+
+endfunction
+

common/radio/qamTable.m

@@ -0,0 +1,17 @@
+% qam(n)
+% Qam 
+% 
+
+function qamTbl=qamTable(n)
+startIQ = 1.0/sqrt(2.0)
+stepIQ = 2*startIQ/(sqrt(n)-1)
+qamTbl = zeros(n,1);
+
+s=1;
+for I=-startIQ:stepIQ:startIQ,
+   for Q=-startIQ:stepIQ:startIQ,
+      qamTbl(s) = I + i*Q;
+      s = s + 1;
+   end;
+end;
+