ofdmframesync: profiling code, improving speed
ofdmframesync: profiling code, improving speed

  * only applying mixer when frame is detected
  * faster computation of initial gain estimate

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