Build a GSM network with RasPi2 ,UmTRX and Osmocom. via rs-online
While it was just about possible to use OpenBTS with a Raspberry Pi version 1, the software required some careful fine tuning and, given the compute intensive nature of such software-defined radio (SDR) applications, it was a far from practical solution and such a setup would barely support calls. However, the Raspberry Pi 2, with not only 4x ARM cores but NEON SIMD extensions — which come in very handy for digital signal processing applications — is a much better fit.
In this post we take a look at installing and running the modular Osmocom GSM network stack on a Pi 2, hooked up via Ethernet to a UmTRX dual-channel SDR transceiver which provides the radio interface. One way to think of the UmTRX is as an exceptionally fast sound card, and it’s important to note that while it does perform some signal processing, this mostly takes place on the Pi, along with the upper layers of the stack.
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