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+4 16 8
+
+0 1 2 3
+4 5 6 7
+8 9 10 11
+12 13 14 15
+0 1 2 3
+4 5 6 7
+8 9 10 11
+12 13 14 15
+0 1 2 3
+4 5 6 7
+8 9 10 11
+12 13 14 15
+0 1 2 3
+4 5 6 7
+8 9 10 11
+12 13 14 15
+
+
+0 4 2 6
+1 5 3 7
+4 0 6 2
+5 1 7 3
+2 6 0 4
+3 7 1 5
+6 2 4 0
+7 3 5 1
+4 0 6 2
+5 1 7 3
+0 4 2 6
+1 5 3 7
+6 2 4 0
+7 3 5 1
+2 6 0 4
+3 7 1 5
+
+This is the rate 2/3 Ungerboeck code with 16 states for 8-PSK (natural mapping).
+The states are defined in Ungerboeck's way.
+
+d_free^2 = 2.274^2 Es --> 7.13 dB (so gain of 4.13 dB over uncoded QPSK)
+
+Parity check matrix in octal: [16 04 23]
+
+Generator Matrix:
+
+[ D 1+D+D^2 0
+ 1+D^2 D^2 D]
+
+