[USRP-users] PPM TX

Rui Pinheiro ruipinheiro0 at googlemail.com
Fri Sep 28 11:05:02 EDT 2012


Hi Nick,

Thanx for your answer.

1. To send pulse I write to buff complex(ampl, ampl). Correct?

2. How can I send samples for zero amplitude carrier wave?

3. Is there any sample code out there?

Thanx a lot!

Rui
Am 28.09.2012 16:50 schrieb "Nick Foster" <nick at ettus.com>:

> One packet per complete transmission. You will run into problems with
> start of burst and end of burst transients otherwise.
>
> --n
> On Sep 28, 2012 5:51 AM, "Rui Pinheiro" <ruipinheiro0 at googlemail.com>
> wrote:
>
>> Hi there,
>>
>> according to Josh's suggestion to create a PPM transmission I checked the
>> example tx_bursts. The pulse lengths time grid is 0.5 us (mircoseconds). I
>> selected a TX Rate of 8MHz. That means 4 samples per pulse.
>> Should the implementation be done by sending 1 packet per pulse including
>> 4 samples and timed by using metadata with timespec OR just 1 packet with
>> an amplitude modulated wave including the pulses (like 4 samples full ampl
>> for a pulse or 4 samples zero ampl for non pulse)? Is the resolution of
>> timespec sufficient (nanoseconds)?
>> If you could send me a code snippet I would be very happy.
>>
>> Thanx a lot for your help!
>>
>> Rui
>>
>>
>> _______________________________________________
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>> USRP-users at lists.ettus.com
>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com
>>
>>
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