Re: [Discuss-gnuradio] Tetra receiver

[Grzegorz Suder]

dqpsk.py module depends on mpsk_receiver_cc. In file $GNURADIO/gnuradio-core/src/lib/general/gr_mpsk_receiver_cc.h there is information:

 * This block takes care of receiving M-PSK modulated signals through phase, frequency, and symbol
 * synchronization. It performs carrier frequency and phase locking as well as symbol timing recovery. 
 * It works with (D)BPSK, (D)QPSK, and (D)8PSK as tested currently. It should also work for OQPSK and 
 * PI/4 DQPSK.

On Thu, Jan 22, 2009 at 7:02 AM, Tommi Rouvali <address@hidden> wrote:

Hello,

I have been thinking about this. I have access to two TETRA terminals.
The down side is I am beginner in Gnu Radio and DSP in general.

Is the π/4 DQPSK modulation really supported by Gnu radio? Any examples about this?


Grzegorz Suder 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,

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