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"If you want to experiment with celluar mobile radios LTE you need a LimeSDR, BladeRF and a help processor."

Why would you need a LimeSDR and a BladeRF ?

I have done plenty of (rx only) GSM/LTE functions with only the (v1) BladeRF ...

If you really want LTE, it's more about xtrx than LimeSDR and BladeRF.

What is a help processor?

Help CPU I meant, something accelerating the signal processing from the software defined radio often a FPGA, field programmable gate array.

In context of GnuRadio and similar, do any projects already utilize FPGA acceleration as offered by USRP?

From what I've seen, it all happens on the CPU.