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From: | Hoang Ngo Khac |
Subject: | Re: [Discuss-gnuradio] Questions on stream tags |
Date: | Tue, 6 May 2014 09:44:15 +0700 |
On 05.05.2014 09:56, Hoang Ngo Khac wrote:Remember that we have a lot tag debugging tools available, such as the QT GUI Time Sink and tag debug.
Dear List,
I'm new to stream tags. Could someone help me to understand about stream
tags and know how to use it?
function and from there on flows the downstream...*until it reaches a
1. In GNU Radio Manual: "A stream tags is generated by a block's work
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?Look in gr-uhd/, there it is.
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?
Seems right. You shouldn't need other blocks to control UHD.
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...
M
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