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

[Smith L.]

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.

Thanks,
Smith

Douglas Geiger-2 wrote:
> 
>  You probably want to take a look at the usrp2_version branch to see
> how to get the transmit code working with the hier_block2 API, and
> then modify it to work with the USRP1. Two things: you cannot transmit
> the 802.11b waveform through the USRP1 (you don't have enough
> bandwidth - in the original code base I believe they simply skipped
> the DSSS step, and transmitted the pulse-shaped DPSK-modulated
> signal), also I believe the usrp2_version branch transmit code fixed
> some of the bugs in the original transmit code (i.e. using a USRP2,
> the transmit code could send a standard-compliant waveform).
>  Doug
> 
> On Thu, May 20, 2010 at 12:47 PM, Smith L. <address@hidden> wrote:
>>
>> Hello all,
>>
>> I am trying to use bbn 80211b transmitter code (douggeiger version from
>> cgran website) with GNU Radio 3.2.2 with USRP1. However, it seems like
>> the
>> Tx code has not been modified completely to work with hier_block2 APIs. I
>> tried to make changes on my own and ended up with an error that I do not
>> know how to solve?
>> I am having a Itemsize mismatch error for message source and
>> bbn_80211_bb_mod.
>>
>> I am using Ubuntu 8.04, Gnuradio 3.2.2, Python 2.6 and USRP1s. I looked
>> up
>> the mailing list and I found very little information for Tx code as
>> everybody seems to be working on the receiver code.
>>
>> Does any one have a working copy of bbn_80211b_tx.py of douggeiger
>> version
>> that works with GNURadio 3.2.2 and USRP1.
>>
>> Any help would be greatly appreciated.
>>
>> Thanks
>> Smith
>> --
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>>
>>
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> 
> 
> 
> -- 
> Doug Geiger
> address@hidden
> 
> _______________________________________________
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> 
> 

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