  This paper concerns the feasibility of full-duplex large-scale
multiple-input-multiple-output (MIMO) cellular systems. We first propose a
pilot transmission scheme and assess its performance, specifically the ergodic
sum-rate. The proposed scheme -- the simultaneous pilot transmission (SPT) --
enables to reduce pilot overhead, where the pilot overhead depends on the
number of antennas at the base station (BS), since the self-interference
channel has to be estimated. We consider two multicell scenarios-- cooperative
and non-cooperative multicell systems--, and derive the analytic model of the
ergodic achievable sum-rate for cell-boundary users. The model is derived by
applying a simple linear filter, i.e., matched filter or zero-forcing filter,
to the BS. In the analytic model, we also consider large-scale fading, pilot
contamination, transmitter noise and receiver distortion. Exploiting the
derived analytic model, the feasibility of full-duplex large-scale MIMO systems
is shown with respect to system parameters. In the end, we confirm that our
analytic model matches well the numerical results and the SPT has advantages
over other pilot transmission methods.
