float
gr_mpsk_receiver_cc::phase_error_detector_qpsk(gr_complex sample) const
{
- float phase_error = -((sample.real()>0 ? 1.0 : -1.0) * sample.imag() -
- (sample.imag()>0 ? 1.0 : -1.0) * sample.real());
- return -phase_error;
+ float phase_error = 0;
+ if(fabsf(sample.real()) > fabsf(sample.imag())) {
+ if(sample.real() > 0)
+ phase_error = -sample.imag();
+ else
+ phase_error = sample.imag();
+ }
+ else {
+ if(sample.imag() > 0)
+ phase_error = sample.real();
+ else
+ phase_error = -sample.real();
+ }
+
+ return phase_error;
}
float