Re: [Discuss-gnuradio] Questions about bbn_80211b_rx.py

[Guanbo Zheng]

You mentioned the transmitter is off. 
What happen if you start the corresponding tx?

Another thing is, you may wanna try lower sampling rate by using bigger decim 
rate. 

Best,
Guanbo

On Dec 5, 2012, at 4:16 PM, Kexiong Zeng <address@hidden> wrote:

> Hi all,
> 
> I am implementing the BBN80211 projects now. I have the following questions:
> 
> I run my receiver (with transmitter off): ./bbn_80211b_rx.py -d 4 -f 2.437G 
> -b -g 100 -v
> The result is:
> 
> address@hidden:~/Projects/bbn_80211/branches/usrp2_version/gr-bbn/src/examples$
>  sudo ./bbn_80211b_rx.py -d 4 -f 2.437G -b -g 100 -v
> adc frequency =  100000000
> decimation frequency =  4
> input_rate =  25000000
> gain =  100.0
> desired freq =  2437000000.0
> baseband frequency 0.0
> dxc frequency -37000000.0
> >>> gr_fir_ccf: using SSE
> Recieved (short) header!
>   signal: 0x37
>   service: 0xD9
>   length: 0xB5D6
>   crc: 0xAA78
> Calculated crc: 0x1DD1
> *** BAD CRC ***
> Recieved header!
>   signal: 0xF0
>   service: 0xAF
>   length: 0x7367
>   crc: 0x9C3D
> Calculated crc: 0xA7A4
> *** BAD CRC ***
> Recieved header!
>   signal: 0xB4
>   service: 0x4F
>   length: 0xE127
>   crc: 0x42E5
> Calculated crc: 0x3BA3
> *** BAD CRC ***
> Recieved (short) header!
>   signal: 0x0A
>   service: 0x88
>   length: 0xBF87
>   crc: 0xB627
> Calculated crc: 0x66E6
> *** BAD CRC ***
> 
> As you can see, I always fail the CRC check and cannot decode the 80211 
> packets successfully.
> 
> I saw some people encountered the same problems as mine but no solutions were 
> posted. Can anyone help?
> 
> Many thanks!
> Curtis
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio