fec|soft: adding comments for relative performance soft decoding
fec|soft: adding comments for relative performance soft decoding

  * true ML decoder: 1.45 dB in Eb/N_0 (BER 10^-5), 1.43M cycles/trial
  * n-3 neighbors:   0.54 dB in Eb/N_0 (BER 10^-5),  124k cycles/trial
  * default to n-3 neighbors

cjcliffe/liquid-dsp,andrepuschmann/liquid-dsp,manuts/liquid-dsp,wangning223/liquid-dsp,biotrump/liquid-dsp,wangning223/liquid-dsp,wangning223/liquid-dsp,andrepuschmann/liquid-dsp,cjcliffe/liquid-dsp,biotrump/liquid-dsp,JayKickliter/liquid-dsp,JayKickliter/liquid-dsp,manuts/liquid-dsp,biotrump/liquid-dsp,cjcliffe/liquid-dsp,jgaeddert/liquid-dsp,biotrump/liquid-dsp,jgaeddert/liquid-dsp,cjcliffe/liquid-dsp,jgaeddert/liquid-dsp,JayKickliter/liquid-dsp,manuts/liquid-dsp,wangning223/liquid-dsp,manuts/liquid-dsp,JayKickliter/liquid-dsp,andrepuschmann/liquid-dsp,cjcliffe/liquid-dsp,biotrump/liquid-dsp,jgaeddert/liquid-dsp,JayKickliter/liquid-dsp,wangning223/liquid-dsp,andrepuschmann/liquid-dsp,jgaeddert/liquid-dsp,andrepuschmann/liquid-dsp,manuts/liquid-dsp