I use a usrp send fcch burst and use another usrp to receive and demodulate the received signal,
the demodulate result sometimes is all '0' which is correct, however it sometimes is all '1'.
I run this test, if the first fcch burst demodulated is all '0' then all fcch burst demodulated is all '0'
in this time's test. if the first fcch burst demodulated is all '1' then all fcch burst demodulated is all '1'
in this time's test.