Title: On the Performance of Zero-Forcing Processing in Multi-Way Massive MIMO Relay Networks,
Abstract: We consider a multi-way massive multiple-input multiple-output relay network
with zero-forcing processing at the relay. By taking into account the
time-division duplex protocol with channel estimation, we derive an analytical
approximation of the spectral efficiency. This approximation is very tight and
simple which enables us to analyze the system performance, as well as, to
compare the spectral efficiency with zero-forcing and maximum-ratio processing.
Our results show that by using a very large number of relay antennas and with
the zero-forcing technique, we can simultaneously serve many active users in
the same time-frequency resource, each with high spectral efficiency.