2 # Copyright 2005,2006 Free Software Foundation, Inc.
4 # This file is part of GNU Radio
6 # GNU Radio is free software; you can redistribute it and/or modify
7 # it under the terms of the GNU General Public License as published by
8 # the Free Software Foundation; either version 3, or (at your option)
11 # GNU Radio is distributed in the hope that it will be useful,
12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 # GNU General Public License for more details.
16 # You should have received a copy of the GNU General Public License
17 # along with GNU Radio; see the file COPYING. If not, write to
18 # the Free Software Foundation, Inc., 51 Franklin Street,
19 # Boston, MA 02110-1301, USA.
22 from math import pi, sqrt
25 # These constellations are generated for Gray coding when symbos [1, ..., m] are used
26 # Mapping to Gray coding is therefore unnecessary
28 def make_constellation(m):
29 # number of bits/symbol (log2(M))
30 k = int(math.log10(m) / math.log10(2.0))
35 a = (i&(0x01 << k-1)) >> k-1
36 b = (i&(0x01 << k-2)) >> k-2
37 bits_i = [((i&(0x01 << k-j-1)) >> k-j-1) for j in range(2, k, 2)]
38 bits_q = [((i&(0x01 << k-j-1)) >> k-j-1) for j in range(3, k, 2)]
44 for jj in range(ll-ii):
45 rr = abs(bits_i[jj] - rr)
46 ss += rr*pow(2.0, ii+1)
53 for jj in range(ll-ii):
54 rr = abs(bits_q[jj] - rr)
55 ss += rr*pow(2.0, ii+1)
61 const_map.append(complex(re, im))
63 norm_map = [complex(i.real/coeff, i.imag/coeff) for i in const_map]
66 # Common definition of constellations for Tx and Rx
68 4 : make_constellation(4), # QAM4 (QPSK)
69 8 : make_constellation(8), # QAM8
70 16: make_constellation(16), # QAM16
71 64: make_constellation(64), # QAM64
72 256: make_constellation(256) # QAM256
75 # -----------------------
77 # -----------------------
78 # binary to gray coding
96 # -----------------------
98 # -----------------------