  Demonstrating the feasibility of large antenna array beamforming is essential
for realizing mmWave communication systems. This is due to the dependency of
these systems on the large array beamforming gains to provide sufficient
received signal power. In this paper, the design of a proof-of-concept
prototype that demonstrates these gains in practice is explained in detail. We
develop a mmWave system with digitally controlled analog front-end. The
developed prototype uses 60 GHz phased arrays and universal software radio
peripheral (USRP) controllers. The software interface of our design is easily
reproducible and can be leveraged for future mmWave prototypes and
demonstrations.
