grc/receiver/gsm_fcch_detector.xml

<?xml version="1.0"?>
<block>
  <name>FCCH Bursts Detector</name>
  <key>gsm_fcch_detector</key>
  <import>import grgsm</import>
  <make>grgsm.fcch_detector($OSR)</make>
<callback>set_OSR($OSR)</callback>
  <param>
    <name>OverSamplingRatio</name>
    <key>OSR</key>
    <value>4</value>
    <type>int</type>
  </param>
  <sink>
    <name>in</name>
    <type>complex</type>
    <vlen>1</vlen>
  </sink>
  <source>
    <name>out</name>
    <type>complex</type>
    <vlen>1</vlen>
  </source>
  <doc>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.</doc>
  <grc_source>/home/piotr/Odbiornik_gsm/gr-gsm/examples/gsm_fcch_detector.grc</grc_source>
</block>