Hi all,
I ran into a problem than seems also met by others, but I am not sure how to solve it.
I use GNU Radio 3.2.2, bbn 802.11b usrp2_version, Python 2.6.5, GCC 4.4.3, and Ubuntu 10.4 LTS.
When I ran the test scripts "bbn_80211b_sptest.py" and "bbn_80211b_test.py" from /bbn_80211_branches/usrp2_version/gr-bbn/src/examples, they both reported BAD CRC error, with the outputs like these:
------------------------------------------------------------------
SNR set at: 12 spb set at: 25 using barker: 1
>>> gr_fir_ccf: using SSE
Recieved (short) header!
signal: 0x70
service: 0x4B
length: 0xE3B1
crc: 0x7F0F
Calculated crc: 0x7F68
*** BAD CRC ***
Recieved (short)
header!
signal: 0x7D
service: 0xD6
length: 0xB306
crc: 0x5672
Calculated crc: 0xA702
*** BAD CRC ***
-----------------------------------------------------------
I searched mailing list, it seems the problem is from short PLCP preamble, but how to fix it and make it run successfully?
Thanks in advance!
Hanks