On Wed, May 6, 2020 at 7:48 PM Artur Nogueira wrote:
> Hello guys,
>
> I'm trying to generate a GMSK signal in accordance to the GSM
> specifications. To do so, I've been trying with both "GMSK Mod" and "GMSK
> Modulator" blocks, the last one with the following parameters:
>
> [image: image.png]
>
> To set these parameters, I considered (i) a sufficiently high base-band
> sampling rate (samples/symbol) in order to avoid aliasing; (ii) the
> well-known 0.3 BT product and (iii) a 156 bits GSM pulse, i.e. 1 time slot
> (I considered that GMSK provides 1 bit/symbol).
>
> Nevertheless, my signals have a bandwidth which is much larger than the
> 200 kHz requirement.
> What am I doing wrong?
>
I think you want something more like 3 symbols for your pulse duration.
Not 156.
Brian
>
