Signal Point Target Code

The signal points transmitted from a given modulation scheme are rotated to follow a pre-defined path through the signal constellation diagram to create a novel rate 1/2 systematic block code that allows for trellis based decoding. By setting a predefined target signal point, the input signal points are rotated to overlay the target signal point to create a code trellis of (M - 1) initial and final rotation states. Simulation results are presented for rate 1/2 systematic target codes created using the M-ary QAM signal constellations for M = 4 and 16.