On 06.05.2014 04:44, Hoang Ngo Khac wrote:
Hi Martin, and all,
I meant, I want to add tx_sob and tx_eob to tell the USRP Sink to
start/stop the TX chain. I intend to add tags before the modulation,
where data type is /byte. /Since the provided block PDU to Tagged Stream
takes message as input, I guess I need to make my own block(s).
On current master, you can also pipe the tagged stream straight into the
uhd sink.
M
On Mon, May 5, 2014 at 7:57 PM, Martin Braun <martin.br...@ettus.com
<mailto:martin.br...@ettus.com>> wrote:
On 05.05.2014 09:56, Hoang Ngo Khac wrote:
Dear List,
I'm new to stream tags. Could someone help me to understand
about stream
tags and know how to use it?
Remember that we have a lot tag debugging tools available, such as
the QT GUI Time Sink and tag debug.
1. In GNU Radio Manual: "A stream tags is generated by a block's
work
function and from there on flows the downstream...*until it
reaches a
sink*...".
If we use tags to tell the USRP Sink to start/stop the TX chain,
do we
need to modify the USRP Sink block?
Probably not... are you talking about tx_sob and tx_eob?
I found that gr_uhd_usrp_sink.cc file contains the
get_tags_in_range()
function. However, this file is not, at first, in the GNU Radio
3.7.0
source folder. How to add this to project and make it work with
USRP Sink?
Look in gr-uhd/, there it is.
2. I am implementing a model of ofdm-based two-way relaying network
apply network coding. Up to now, each single transmission in one
time
slot are done, but the model runs without any timing
synchronization.
For this, I need to use TDMA, and stream tags is the solution. I
list
here the steps to make TDMA with stream tags. Could you leave some
comments if I miss some thing?
+ Add tags to stream; using provided block such as PDU to Tagged
Stream,
or custom block.
+ Write a block for error checking, repeat request...
Seems right. You shouldn't need other blocks to control UHD.
M
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