Actualy what I am worrying about are discontinuous TDMA signals (for example: receiving specific time slot). I guess that capturing such TDMA signal (Tetra is just an example due to 4 time slots) where only one slot is transmitting may require synchronization to external time source.
On Wed, Jan 21, 2009 at 7:59 PM, Eric Blossom <[email protected]> wrote: > On Mon, Jan 19, 2009 at 10:56:13AM +0100, Grzegorz wrote: > > Hello, > > I've looked through Wiki and discussion archives but I haven't found > answer > > for my question. Is there any working code for Gnu Radio that is able to > > receive Tetra subscriber (not base station) signal and convert it into > > bitstream? I believe that demodulation is already done (DQPSK as I know) > but > > there is still timing and slot separation issue. Seems that there were > > attempts to introduce support for inband signaling for Gnu Radio but last > > information I've found are from 2007. > > Regards, > > I don't know of anybody who's done this, but it should be possible. > (There's not much (any?) Tetra in the US, so those of us in the US > haven't spent any time on it.) If you're doing receive only, you > don't need the inband features. Just grab all of the signal and sort > out the framing structure on the host. > > Eric >
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