Hi Piotr,

The digital signal processor part of the OpenBSC project is Osmo-TRX. Please take a look here:

http://cgit.osmocom.org/osmo-trx/

It implements an almost full featured 2G transceiver, including modulation, demodulation.

Tom Tsou is the maintainer of that part of the code. He is fairly busy, but I copied him to this mail, lets see if he can point you in the correct direction.

I would recommend you to read Toms masters thesis in this area:

http://scholar.lib.vt.edu/theses/available/etd-09242012-133001/unrestricted/...

It will give you a nice insight how Osmo-TRX works, and what are the challenges to implement something you want.

There is a clear intention to improve OpenBSC with EDGE capability, so your work in this regard will be greatly appreciated.

Regards, Csaba

----- Original Message ----- From: "Piotr Krysik" ptrkrysik@gmail.com To: openbsc@lists.osmocom.org Sent: Thursday, August 20, 2015 9:52:42 AM Subject: 8-PSK modulation/demodulation

Hi all,

I'm developing gr-gsm - the ancestor of Airprobe's gsm-receiver. I want to add support for 8-PSK reception. I'm going to implement a demodulator (preferably doing also channel equalization) and also modulator (currently mostly to generate test data).

I don't want to duplicate work that was already done so I want to ask if you are aware of any publicly available 8-PSK implementations (or partial implementations) aimed at supporting EDGE reception? Also I will greatly appreciate pointing to any documents containing good information on this topic.