Re: [Discuss-gnuradio] BBN 80211b Transmitter with GNURadio 3.2.2 and USRP1

[George Nychis]

On Thu, May 20, 2010 at 3:14 PM, Smith L. <address@hidden> wrote:

Thanks for the help, Doug.

I do have two USRP2s and hence was also working on the usrp2_version code. I
have both the transmitter and receiver code individually working correctly
with USRP2. However, the receiver is not able to receive the packets
correctly from the transmitter (i.e in case of USRP2). I always get bad CRC
message.

I have looked up the forum and everybody seem to stuck with the same
problem. Is there any work around to solve this problem?

>From the forum discussion, it seems that one of the issues is the preamble.

Any idea how to make synchronize the receiver so that it can receive the
packets from USRP2 transmitter using bbn code.

I struggled with this for quite a while.  I never understood exactly where a standard card was not able to decode it.  Large frequency offset maybe?  I never got a single packet through.

Can I suggest something?  Try out this 802.11 project:
https://www.cgran.org/wiki/ftw80211ofdmtx

They definitely claim that a standard NIC can decode the packets, but I never personally got around to trying it.  The code seemed pretty clean, and I was able to use it to generate proper packet signatures... so the modulation is definitely correct.

- George