Hi Alex, you may want to take a look at the OOT module gr-cdma ( https://github.com/anastas/gr-cdma). This system implements a two-channel system with one of the orthogonal channels being continuously transmitting pilots, while the other carries data (in a synchronous/asynchronous way). The Rx is always listening to the pilot channel and is continuously adjusting frequency/timing.
Achilleas
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