Re: [Discuss-gnuradio] Spectrum sensing with RLT-SDR on Android WITHOUT Gnu Radio

[Marcus Müller]

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Hi Przemek,
well, since this is the open source world, you shouldn't need to write
everything from scratch.
You can of course start off with Martin Marinov's source code,
https://github.com/martinmarinov/rtl_tcp_andro-
which will give you an tcp server serving samples (the code says it's
a port of rtl_tcp from the rtl-sdr package); from there on it's java
all the way down ;)
However, I'd expect the average smartphone not to be the device you'd
want to do FFT on, in Java, which doesn't even offer you access to
your own memory, but then again I have no clue about android and if it
offers any accelerators for stuff like that. Googling FFT Java turned
up quite a bit, so I think you'd might be in luck ;) Generally, as I
understand the situation with rtl_tcp_andro, you'll need C code to
interact with the device (makes sense to me) and then you're free to
use basically every C lib (and most probably even C++) you want within
the restriction imposed by hardware and android, which, for signal
processing, shouldn't be harsh.

So: Happy hacking,
Marcus Müller

On 12.02.2014 17:37, Przemysław Pawełczak wrote:
> Hello,
> 
> This is my first post to this mailing list and my apologies if I
> ask a lame/irrelevant question. Unfortunately, me and my hacking
> friend could not find the answer to the issue we are trying to
> solve (Google, etc.) so here is my post.
> 
> We want to implement the most fundamentally simple spectrum
> sensing algorithm (energy detector for example) directly on Android
> device, where our raw I/Q samples are gathered through RTL-SDR
> dongle ( http://sdr.osmocom.org/trac/wiki/rtl-sdr).
> 
> Yes, we are aware of http://sdr.martinmarinov.info - but this is
> not what we want. What we want is a set of functions (FFT, etc.)
> that will do the signal processing/signal detection directly on
> Android. Thus - we don't want (wish we could) any Gnu Radio
> wrappers. Ideally - we look for Java-based implementation of the
> thing described above.
> 
> Thus - is there anything out there that we can use or we need to
> write all from scratch?
> 
> Best regards, Przemek
> 
> 
> 
> _______________________________________________ Discuss-gnuradio
> mailing list address@hidden 
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> 
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