An Experimental Study of Energy and Bit Efficiency in Collocated- and Distributed-MIMO using 28 GHz Testbed

This paper reports the bit efficiency comparative study and its experimental verification of the collocated-MIMO and the distributed-MIMO using the eight transceivers 2S GHz digital beam-forming testbeds. Under conditions the user equipment units are randomly located in the LoS coverage area and they have spatially selected each other by the zero-forcing method, the distributed-MIMO exhibits average 4 to 7 dB better SNR than collocated-MIMO when the number of simultaneous connected users is approaching to the number of transceivers. Their measured maximum bit efficiencies reach 99 Mbit/Joules and 192 Mbit/Jules respectively, considering the radiated power and transceivers consumption.