FCCH bursts detector gsm_fcch_detector import grgsm grgsm.fcch_detector($OSR) set_OSR($OSR) OverSamplingRatio OSR 4 int in complex 1 out complex 1 Piotr Krysik Detects positions of FCCH bursts. At the end of each detected FCCH burst adds to the stream a tag with key "fcch" and value which is a frequency offset estimate. The input sampling frequency should be integer multiply of GSM GMKS symbol rate - 1625000/6 Hz. /home/piotr/Odbiornik_gsm/gr-gsm/examples/gsm_fcch_detector.grc