Can I use ADALM-PLUTO to design a beamforming testbed?
If yes what are the difficulties? If not what is the best low-cost SDR option to design beamforming testbed?
Pluto has a single transmit and a single receive, so I'm not sure how useful it would be for you. You also cannot sync multiple Plutos together.
What are your requirements for a beamforming testbed?
I am just starting with beamforming implementations. Initially, I wish to develop a system with four elements receiver using different DBF algorithm. Later on, I will move to a complete transmitter-receiver system.