  We propose practical transceiver structures for double-sided massive
multiple-input-multiple-output (MIMO) systems. Unlike standard massive MIMO,
both transmit and receive sides are equipped with high-dimensional antenna
arrays. We leverage the multi-layer filtering architecture and propose novel
layered transceiver schemes with practical channel state information
requirements to simplify the complexity of our double-sided massive MIMO
system. We conduct a comprehensive simulation campaign to investigate the
performance of the proposed transceivers under different channel propagation
conditions and to identify the most suitable strategy. Our results show that
the covariance matrix eigenfilter design at the outer transceiver layer
combined with maximum eigenmode transmission precoding/minimum mean square
error combining at the inner transceiver layer yields the best achievable sum
rate performance for different propagation conditions and multi-user
interference levels.
