<quote author='Martin Elfvelin via USRP-users'>
On 21/04/21 14:16, Margaux Bougeard wrote:
> What is the procedure to create a transmitter with a sample rate of 61,44
> MHz with the USRP E312 ? I wonder if I am not limited by the sample data
> transfer rate of ARM processor.
As stated by Marcus, you are limited by the ARM processor.
> I want to use the USRP E312 to transmit a sequence, with IQ data,
> continuously
Do you mean a known fix sequence that you repeat continuously?
Yes I want to send the same sequence continuously all the time.
Does it need to be send continuously or periodically,
eg. sending the same preamble sequence every x ms?
I need to send continuously.
Depending on the answer and the size of the sequence, you could use:
- tx_stream->send with an attached timestamp (tx_medatada).
This worked on E310 for 320 IQ at 20 MHz, send every ms.
- A custom RFNOC block (since the Replay is not implemented on E31x) to
bypass the ARM.
Currently, I use tx_stream to send the sequence.
- I create my usrp object
- I set the different settings (frequency, sample rate, gain)
- I create a tx_streamer
- I configure the metadata :
- I set metadata.has_time_spec to True because I want to start the
transmission on a PPS retrieved by the GPS antenna connected the USRP GPS port.
- I set metadata.start_of_burst and metadata.end_of_burst to True
- I configure metadata.time_spec to choose the start time of my
transmission
- I create my sequence
- I use tx_stream in a while loop to transmit continuously :
while True :
tx_streamer.send(sequence, metadata)
metadata.has_time_spec = False
Regards
Regards
--
Cédric Hannotier
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