# (DVB-T2) Question for people whith wideband SDR

**URL:** <https://www.ruby-forum.com/t/dvb-t2-question-for-people-whith-wideband-sdr/234536>\
**Category:** GNU Radio\
**Created:** [March 12, 2015, 7:54am UTC](https://www.ruby-forum.com/t/dvb-t2-question-for-people-whith-wideband-sdr/234536 "2015-03-12T07:54:10Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\
**Post date:** [March 12, 2015, 7:54am UTC](https://www.ruby-forum.com/t/dvb-t2-question-for-people-whith-wideband-sdr/234536/1 "2015-03-12T07:54:10Z")

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Hi, i work on software T2 decoder. Now decoder can detect and demodulate  
P1 symbol, and estimate sample rate and carrier offset mostly correctly  
on gaussian noise channel. (P1 Detection impemented like in “DVB-T2  
Implementation Guide”, robust estemation goes by correlation beetween  
two FFT1K parts of P1, (sliced part shifted by 1 sample before  
correlation whith middle FFT1K part, then S1, S2 indicators detected  
wihth frequency loop, by minimal hamming distance, beetween received  
data, and known patterns, after S1 S2 decoded, fine offset estimation  
performed by comparing phase offsets beetween 2 carriers of recieved,  
and generated P1 parts). Guard interval detection already works too. I  
stoped after L1PRE demodulation, my decoder use only BCH, bypassing LDPC  
step, (cause LDPC/BCH coding in T2 is systematic) It works normaly with  
syntezited DVB-T2 signals. But not with real world signals. I have a DIY  
SDR receiver whith quite poor SNR (but it can receive DVB-T 16QAM 3/2  
8Mhz from test generator with antennas - in our air is only T2). I try  
to capture T2 signal from air, but decoder show only S1 S2 (0 10 in my  
area), but offset estemated incorrectly.

So can anyboby share DVB-T2 samples (1 sec is enough) ??

Thanks !.

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**Author:** ![victor123789](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/v/f0a364/32.png) [@victor123789](https://www.ruby-forum.com/u/victor123789)\
**Post date:** [November 21, 2015, 7:58pm UTC](https://www.ruby-forum.com/t/dvb-t2-question-for-people-whith-wideband-sdr/234536/2 "2015-11-21T19:58:08Z")

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Hello Victor,

You can find here all you need…I hope.  
ftp://ftp.kw.bbc.co.uk/t2refs

Good luck !