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Sipos Csaba sipos.csaba at kvk.uni-obuda.huHi 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/Tsou_T_T_2012.pdf 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 at gmail.com> To: openbsc at 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. -- Best Regards, Piotr Krysik