Re: [Discuss-gnuradio] DVB-T Receiver in Raspberry Pi 3 and RTL-SDR

[Ron Economos]

I second the suggestion to just use the RTL-SDR dongle in it's original role as a DVB-T receiver. However, since you're sending DVB-T with another SDR (the B210) you could send non-standard narrow band DVB-T.

For example, you could send 1 MHz wide DVB-T with a sample rate of 1.142857 Msps (8 / 7 Msps). Or you could send DVB-T at a sample rate that's known to work well with the RTL-SDR.

Even 1 MHz wide DVB-T would support 3.9 Mbps with 64QAM and 7/8 code rate. Enough for HD with H.264 video.

Unfortunately, the GNU Radio DVB-T receiver is a bit of a CPU hog. So even narrow band DVB-T may be too much for the RPi3.

Here's a DVB-T bit-rate calculator. It takes integer bandwidths as input (normally 6, 7 and 8), but could be modified for any sample rate.

https://github.com/drmpeg/dtv-utils/blob/master/dvbtrate.c

Ron

On 04/22/2017 06:33 AM, Marcus Müller wrote:

Hi Sagnik,

I very strongly doubt the RPi3 will have enough compute power to do DVB-T decoding from samples in software; also, DVB-T has wider channels than the RTL-SDR dongle would allow you to stream to your PC in sample form.

Of course, if you just actually want DVB-T reception, just use the RTL-Dongle like the manufacturer intended it: as DVB-T receiver, which does the decoding on-chip with the integrated specialized hardware. The fact that you can alternatively use it as SDR frontend is just because that part of the chip can be "bypassed".

Best regards,

Marcus

On 04/22/2017 03:23 PM, Sagnik Basu wrote:

Hi.

Will the DVB-T Rx flowgraph in gr-DVB gnu radio, work well with RTL-SDR connected to Raspberry Pi 3?

If not, is there any suggestion how can I receive and decode video/picture data in raspberry Pi 3 and RTL-SDR? 

The video/picture data is being transmitted by USRP B210.

Regards,

Sagnik Basu

B. Tech | 2013-2017
Dept. of Electronics and Communication
NIT Rourkela
M: 8337942928

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