27 Jan
2011
27 Jan
'11
11:08 a.m.
[snip] ... but wondered if
anyone had worked on the GR porting of the code. I assume, that is not the
case.
No that I know of.
What would be the interest exactly ?
I mean GR is great for signal processing but once you got the bits,
the rest is IMHO way better handled outside gnuradio itself. All the
phy/mac levels are no trivial and will need state processing and such
... not something I really see in GR.
Using fifo on the filesystem you can pipe directly/live the flow of
info from GR outpout to the tetra-rx input.
Cheers,
Sylvain
BTW, you forgot to CC the list in your reply. (I assume it was your
intent because of the "with everyone here" comment at the end of your
mail).
27 Jan
27 Jan
11:18 a.m.
New subject: TETRA and GRC?
On 01/27/2011 11:08 AM, Sylvain Munaut wrote:
My plan is to create a GNU Radio block that will give us the softbits. I was a
bit sad that GNU Radio only has python bindings to script things but not to do
any work.
[snip] ... but
wondered if
anyone had worked on the GR porting of the code. I assume, that is not the
case.
No that I know of. 
11:25 a.m.
New subject: TETRA and GRC?
Hi Sylvain,
Thanks for posting it to the list, I just hit reply, I thought the list is the
main "to" part of the reply, but now I know, I have to put reply-all instead.
What I am using GR is use the AIR interface of the TETRA in a simple way, I
would like to create a system similar to OpenBTS to handle TETRA. The main
problem I have is I am a pure HW design engineer and my knowledge of Linux,
Python and high level SW is not very strong, but I am learning.
Best regards,
Farhad
________________________________
From: Sylvain Munaut <246tnt(a)gmail.com>
To: Farhad Abdolian <f.abdolian(a)yahoo.com>
Cc: tetra(a)lists.osmocom.org
Sent: Thu, January 27, 2011 11:08:52 AM
Subject: Re: TETRA and GRC?
[snip] ... but wondered if
anyone had worked on the GR porting of the code. I assume, that is not the
case.
No that I know of.
What would be the interest exactly ?
I mean GR is great for signal processing but once you got the bits,
the rest is IMHO way better handled outside gnuradio itself. All the
phy/mac levels are no trivial and will need state processing and such
... not something I really see in GR.
Using fifo on the filesystem you can pipe directly/live the flow of
info from GR outpout to the tetra-rx input.
Cheers,
Sylvain
BTW, you forgot to CC the list in your reply. (I assume it was your
intent because of the "with everyone here" comment at the end of your
mail).
5:35 p.m.
New subject: TETRA and GRC?
On Thu, Jan 27, 2011 at 02:25:31AM -0800, Farhad Abdolian wrote:
Hi Sylvain,
Thanks for posting it to the list, I just hit reply, I thought the list is the
main "to" part of the reply, but now I know, I have to put reply-all instead.
What I am using GR is use the AIR interface of the TETRA in a simple way, I
would like to create a system similar to OpenBTS to handle TETRA. The main
problem I have is I am a pure HW design engineer and my knowledge of Linux,
Python and high level SW is not very strong, but I am learning.
Please understand that it is quite a big task to do this. A receive-only
implementation like what we have now is relatively simple, but in order
to run a full TETRA system, you need to implement all the protocols like LLC,
LME, MM, CC and their associated logic, which is a huge task.
Getting something like a small transmitter goign that continuously transmits
a BSCH/BNCH should be a simple task that you can start with. Basically use
the same code that we use in conv_enc_test.c to generate the type-5 bits,
feed them into the DQPSK modulator and try to see if TETRA handsets can
recognize the signal.
--
- Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
(ETSI EN 300 175-7 Ch. A6)
8:36 p.m.
New subject: TETRA and GRC?
Hi Harald,
I am aware of the complexity of the TETRA system, I just want to implement the
physical layer (Layer 1) and if I can also the Layer 2 of the protocol and be
able to show that it can be done with GR. I want to create both the RX and TX
path using GnuRadio.
I am working on implement the blocks similar to those on Figure 4.1 and 4.2 of
EN 300 392-2: V3.4.1 (2010-08).
That shouldn't be such a difficult task.
Best regards,
Farhad
________________________________
From: Harald Welte <laforge(a)gnumonks.org>
To: Farhad Abdolian <f.abdolian(a)yahoo.com>
Cc: Sylvain Munaut <246tnt(a)gmail.com>om>; tetra(a)lists.osmocom.org
Sent: Thu, January 27, 2011 5:35:20 PM
Subject: Re: TETRA and GRC?
On Thu, Jan 27, 2011 at 02:25:31AM -0800, Farhad Abdolian wrote:
Hi Sylvain,
Thanks for posting it to the list, I just hit reply, I thought the list is the
main "to" part of the reply, but now I know,
I have to put reply-all instead.
What I am using GR is use the AIR interface of the TETRA in a simple way, I
would like to create a system similar to OpenBTS to handle TETRA. The main
problem I have is I am a pure HW design engineer and my knowledge of Linux,
Python and high level SW is not very strong, but I am learning.
Please understand that it is quite a big task to do this. A receive-only
implementation like what we have now is relatively simple, but in order
to run a full TETRA system, you need to implement all the protocols like LLC,
LME, MM, CC and their associated logic, which is a huge task.
Getting something like a small transmitter goign that continuously transmits
a BSCH/BNCH should be a simple task that you can start with. Basically use
the same code that we use in conv_enc_test.c to generate the type-5 bits,
feed them into the DQPSK modulator and try to see if TETRA handsets can
recognize the signal.
--
- Harald Welte <laforge(a)gnumonks.org> http://laforge.gnumonks.org/
============================================================================
"Privacy in residential applications is a desirable marketing option."
(ETSI EN 300 175-7 Ch. A6)
4838
days inactive
4838
days old
4 comments
4 participants
participants (4)
-
Farhad Abdolian -
Harald Welte -
Holger Hans Peter Freyther -
Sylvain Munaut