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Farhad Abdolian f.abdolian at yahoo.comHi 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 at gnumonks.org> To: Farhad Abdolian <f.abdolian at yahoo.com> Cc: Sylvain Munaut <246tnt at gmail.com>; tetra at 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 at gnumonks.org> http://laforge.gnumonks.org/ ============================================================================ "Privacy in residential applications is a desirable marketing option." (ETSI EN 300 175-7 Ch. A6) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/tetra/attachments/20110127/3a1c5f2d/attachment.htm>