It's solved! Just open 'bbn_80211b_pkt.py' and set 'short_preamble = 0', then long preamble is used and test scripts work well.
But why short preamble doesn't work? ________________________________ 发件人： Zhen <[email protected]> 收件人： [email protected] 发送日期： 2010/10/9 (周六) 6:25:22 下午 主 题： [Discuss-gnuradio] Problem of ***BAD CRC*** for GNURadio bbn_80211b 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
_______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
