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 Mon, May 5, 2014 at 7:57 PM, Martin Braun <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 > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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