this paper, we study the capacity limits of dense multiantenna
systems. We derive asymptotic capacity expressions
for point-to-point and broadcast channels by applying recent
tools from random matrix theory. In the case of broadcast
channels, we focus on linear precoding techniques. We found
that the asymptotic capacity depends only on the ratio between
the size of the antenna array and the wavelength.
This provides useful guidelines on the achievable limits of
information transfer. In particular, it is shown that the total
capacity grows unbounded if the transmitter has perfect
knowledge of the channel, while the capacity saturates in
the absence of channel knowledge at the transmitter. We
provide numerical results supporting the theoretical derivations.
