Re: [Discuss-gnuradio] in-band signaling & dependent packets (i.e., ACK generation)

[George Nychis]

> You're not getting rid of the PHY layer.  You're incorporating this
> mechanism into the PHY layer as opposed to having it within the MAC
> layer.

I see, I want to go lower than the PHY layer really...

> You can accomplish this by using some simple sign manipulation/zero
> insertion and treating the GMSK as a simple PSK that only shifts 90
> degrees for each transition.  No new multipliers should be required,
> but memory will be needed for coefficients and samples.
>
> How many bits is your address and how many bits is your frame sync?

Here's the thing, I don't want the solution to be dependent on the 
physical layer.  The goal is a development platform, and by choosing a 
solution dependent on GMSK, I essentially lock all MAC development in to 
using GMSK.  Is there a solution independent of the PHY layer?  I 
suppose I'm still not sure :)

If some mechanism could be built in the FPGA that was highly 
reconfigurable, that would be fine... but it seems to be boiling down to 
different techniques per-modulation.

- George