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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