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Re: [Discuss-gnuradio] tx_time tag accuraccy
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From: |
Tom Tsou |
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Subject: |
Re: [Discuss-gnuradio] tx_time tag accuraccy |
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Date: |
Mon, 9 Jun 2014 01:05:49 -0400 |
On Wed, Jun 4, 2014 at 2:01 PM, bob wole <address@hidden> wrote:
> I think that USRP transmit FIFO is at the start of the DSP chain in FPGA i.e
> it is prior to both of the interpolation filters? right? I am not talking
> about when the burst will be over the air, I want to know when the first
> sample of the burst will leave the transmit FIFO if it has been tagged as
> tx_time=X.
If you tag a burst with time X, that burst will be released from the
device buffer at time X - assuming the burst arrives at the device
before time X. After time X, there will be a sample rate dependent
delay and a fixed analog group delay before the burst can be observed
at the antenna output.
In other words, a burst tagged to transmit at time X will leave the
buffer at time X.
-TT