Some Questions about leansdr in processing IQ file

[wufeissdfz]

Hello，

Recently，I tried to compile and install leanDVB and finally finish the functional loop tests.
This week I used leanDVB to process a IQ file sampled from a DVB-S2 standard tx card.
But I failed. I think the IQ file format may cause the problem.
CMD :
leandvb --s16 -f 2500000 --sr 1000000 --gui --fd-info 2 --standard DVB-S2 --sampler rrc < IQREC-08-12-20-10h17m40s384.iq > test0812_1.ts
The parameters of the DVB-S2 signal are listed below.
CCM 1Msps 8PSK 3/5 with pilot ShortFrame
The payload is a transport stream.

The IQ file looks well in cooledit, which sample rate is 2.5Msps. (16bits LSB)

The format of IQ file is complex short. I think the parameter of the IQ file is --s16.
There is the IQ file link. https://we.tl/t-Ak52TAHKwx

Many thanks.

[pabr]

The spectrum is inverted in your IQ file. leandvb does not support that yet in DVB-S2 mode.

As a workaround you can flip the sign on each Q sample or swap each I/Q pair. Then leandvb should produce a 704x576 MPEG2 TS.

[wufeissdfz]

The spectrum is inverted in your IQ file. leandvb does not support that yet in DVB-S2 mode.

As a workaround you can flip the sign on each Q sample or swap each I/Q pair. Then leandvb should produce a 704x576 MPEG2 TS.

Thanks a lot. After I modify the IQ file, it works well.

[klimentyev]

@wufeissdfz Can you reupload your iq file? I can't download it by your link :( I wanna work with leansdr, but I haven't got any raw iq with DVB-S2.

[klimentyev]

@pabr I would be grateful if you would share this or a similar IQ file.

[pabr]

@klimentyev You can generate DVB-S2 IQ streams with tools that ship with leandvb, see:
#25 (comment)

However this will not simulate the specific issue that was present in the IQ file of @wufeissdfz, i.e. spectrum inversion.

[klimentyev]

@pabr Thank you very much. The utility helps me.

[wufeissdfz]

@pabr Thank you very much. The utility helps me.

Sorry for my reply late, I can generate DVB-S2 sample, what about the parameters of DVB-S2 IQ file.

[klimentyev]

@wufeissdfz Thx, but I wanna process the real signal for check my information data parser.