We would like to use wide band SDR such as bladeRF or other, in order to implement 20 receivers in the 2.4Ghz band.
Receivers should be 1 or 2 mbps, gfsk, with predefined properties.
Simple version should detect RSSI over noise (and maybe preamble) and send I/Q samples together with time stamp.
A better version will run bit synchroniser on each channel and only send bits if rssi above threshold.
budget and time line to be agreed.