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Re: [Discuss-gnuradio] DVB-T/T2

From: Bogdan Diaconescu
Subject: Re: [Discuss-gnuradio] DVB-T/T2
Date: Wed, 8 Apr 2015 12:57:06 +0000 (UTC)

Hi Ralph,

DVB-T.png shows some u's on the command line which means the whole flowgraph do not provide data to USRP at the right speed. It basically mean the computer cannot cope with the required processing requirement.

As for the video parameters, in the DVB-T specs (http://www.etsi.org/deliver/etsi_en/300700_300799/300744/01.06.01_60/en_300744v010601p.pdf) you will find Table 17 where the rates are presented. FYI, the settings you have used are 8Mhz bandwidth, QAM-16 constellation, coding 1/2, guard interval 1/32. The video should be constant bit rate but it is not a hard requirement (see below).

If you just broadcast video from a file and not plan to use a live streaming from camera, the rate should not matter too much. The video is sent at the rate of the DVB-T according to it's parameters and with RTL2832 receiver it is buffered and played at the correct speed (at least for short files like test.ts).


On Wednesday, April 8, 2015 11:55 AM, "Ralph A. Schmid, dk5ras" <address@hidden> wrote:

Yep, this would be quite useful!

Bogdan, as you are here, too - I don't know very much about all the crazy video file stuff, but maybe you can give me some basic parameters I need to comply with for a transport stream, to be able to transmit it with your package?! I need to use Windows for the conversion, as my Linux installation is only on a virtual machine, with limited space and power. A capable looking Windows program is available, but there are so many options I have no clue about :(
I modified your flow graph according to Rons hints, and now I have a stable and reliable DVB-T transmission path with your package. See http://dk5ras.dyndns.org/tmp/DVB/ with a screenshot. I am using the Ettus B210, and for reception a second PC with DVB-T stick, or a DVB-x tester that does them all, DVB-C/S/S2/T/T2.
You and Ron really did a great job with coding those DVB-x packages!
From: address@hidden [mailto:address@hidden On Behalf Of Bogdan Diaconescu
Sent: Wednesday, April 8, 2015 8:01 AM
To: Ron Economos; address@hidden
Subject: Re: [Discuss-gnuradio] DVB-T/T2
Ok, it would be useful to have receivers too like for the DVB-T.
On Tuesday, April 7, 2015 11:23 PM, Ron Economos <address@hidden> wrote:
Only transmitter implementations for now. They are here:



The DVB-T2 implementation supports T2-Lite, tone reservation PAPR reduction and MISO processing.

On 04/07/2015 06:38 AM, Bogdan Diaconescu wrote:
Hi Ron,
I have not followed the development of DVB-T2/S2 lately. Are there receiver implementations for the T2/S2 or just transmitters?
On Tuesday, April 7, 2015 1:32 PM, "Ralph A. Schmid, dk5ras" <address@hidden> wrote:
Great to hear that you work finds its way into the official thing!
At the moment, as the RF stuff works, I am trying to learn about all this crazy video file stuff, for being able to create transport streams with my own content. Up to now I am still testing with the cartoon .ts :) Still my laptop (with DVBViewer software) will not decode the audio, while the DVB tester decodes audio just fine.
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