  With the advances in virtual and augmented reality, gaming applications, and
entertainment, certain indoor scenarios will require vastly higher capacity
than what can be delivered by 5G. In this paper, we focus on massive MIMO for
indoor environments. We provide a case study of the distributed deployment of
the antenna elements over the walls of a room and not restricting the antenna
separation to be half the wavelength. This is a new paradigm of massive MIMO
antenna deployment, introduced under the name RadioWeaves. We investigate
different antenna deployment scenarios in line of sight communication. We
observe that the RadioWeaves deployment can spatially separate users much
better than a conventional co-located deployment, which outweighs the losses
caused by grating lobes and thus saves a lot on transmit power. Through
simulations, we show that the RadioWeaves technology can provide high rates to
multiple users by spending very little power at the transmitter compared to a
co-located deployment.
