Re: [Discuss-gnuradio] OFDM on USRP2

[vanITA1082]

Thanks.

However we are trying to transmit a packet from a usrp n210 to another usrp
n210 and we are searching for examples do to this simple operation.

How is it possible that are not out there? Do you know any source of simple
examples?


Thanks

Vanessa


Tom Rondeau wrote:
> 
> On Mon, May 30, 2011 at 5:05 AM, vanITA1082
> <address@hidden>wrote:
> 
>>
>> Dear Tom,
>>
>> Do you mind sharing your code for usrp n210 ?
>>
>> I am new on gnuradio and usrp and I am not able to find a python example
>> to
>> perform packet transmission.
>>
>>
>> Thank you
>>
>> Vanessa
>>
> 
> 
> You can find lots of examples from my gr_apps github repo:
> github.com/trondeau/gr_apps
> 
> For direct cloning:
> git://github.com/trondeau/gr_apps.git
> 
> Note, some of these are just basic utilities while others are more
> "works-in-progress" type projects.
> 
> Tom
> 
> 
> 
> 
>> Tom Rondeau wrote:
>> >
>> > On Mon, Jan 17, 2011 at 2:48 PM, Josh Blum <address@hidden> wrote:
>> >>
>> >>
>> >> On 01/17/2011 11:31 AM, Veljko Pejovic wrote:
>> >>> Hi,
>> >>>
>> >>> I updated the OFDM example. You can find it at
>> >>> http://www.cs.ucsb.edu/~veljko/downloads/ofdm_example.tar.gz
>> >>>
>> >>> It supports both USRPs and the UHD driver. I get pretty bad
>> >>> performance with UHD receiver for some reason. Any ideas?
>> >>>
>> >>
>> >> For the UHD performance issue, which model usrp? The following applies
>> >> to usrp2:
>> >>
>> >> Was the bad performance on a transmit + receive application? There was
>> >> an issue where if receive was not keeping up, the transmit flow
>> control
>> >> could be hampered; this is fixed on next branch.
>> >>
>> >> Or was it receive only? And in any case did UHD print and warnings
>> about
>> >> buffer sizes? Because it needs sysctl permission to allocate a large
>> >> enough receive buffer.
>> >>
>> >> -josh
>> >
>> >
>> > I found issues with the UHD code in setting the sample rates. When you
>> > set the sample rate, the best thing to do is ask the UHD device what
>> > the real sample rate it was actually set to. I then use a PFB arb
>> > resampler to adjust to the actual sample rate that I want.
>> >
>> > I was playing around with some FM signals and found that I couldn't
>> > get anything clean out until I did this, even though I was setting
>> > what I thought was a standard sample rate (that is, an integer
>> > decimation of the clock) to my N210. What I asked for and what I set
>> > were only off by a little bit, but it makes a huge difference in
>> > performance for FM signals.
>> >
>> > That said, we should be adjusting for this in the OFDM code, but it's
>> > something to keep in mind.
>> >
>> > Tom
>> >
>> >
>> >>>
>> >>> Cheers,
>> >>>
>> >>>
>> >>> Veljko
>> >>>
>> >>>
>> >>> On Tue, Jan 11, 2011 at 9:26 PM, Guanbo <address@hidden> wrote:
>> >>>>
>> >>>> Hi,
>> >>>>
>> >>>> I was looking for the source codes through the list.
>> >>>> And I got one from Veljko from UCSB, who are very nice to share his
>> >>>> codes,
>> >>>> "ofdm_example.tar.gz"
>> >>>> The codes are attached.
>> >>>> Given the enough gain in TX and RX, you can see the output result at
>> >>>> RX.
>> >>>>
>> >>>> Guanbo
>> >>>>
>> http://old.nabble.com/file/p30650478/ofdm_example.zipofdm_example.zip
>> >>>>
>> >>>>
>> >>>> mrahaim wrote:
>> >>>>>
>> >>>>>
>> >>>>> Hi all,
>> >>>>>
>> >>>>> Does anyone know of any updated OFDM benchmark code that is
>> modified
>> >>>>> to
>> >>>>> be run on a USRP2?  I have seen previous posts of this, however the
>> >>>>> link to the updated code is no longer available.
>> >>>>>
>> >>>>> Thanks,
>> >>>>>
>> >>>>> Michael Rahaim
>> >>>>> Graduate Research Assistant
>> >>>>> Smart Lighting Engineering Research Center
>> >>>>> Boston University
>> >>>>> address@hidden
>> >>>>>
>> >>>>>
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>> >>>>>
>> >>>>
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>> >>>>
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