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Harald Welte laforge at gnumonks.orgOn 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)