On the Feasibility of Full-duplex Large-scale MIMO Cellular Systems

TL;DR

This paper evaluates the feasibility of full-duplex large-scale MIMO cellular systems, proposing a new pilot transmission scheme that reduces overhead and analyzing its performance through an analytic model considering various practical factors.

Contribution

It introduces the simultaneous pilot transmission (SPT) scheme and derives an analytic model for ergodic sum-rate in full-duplex large-scale MIMO systems, considering realistic impairments.

Findings

SPT reduces pilot overhead compared to traditional methods.

Analytic model accurately predicts system performance.

Full-duplex large-scale MIMO is feasible under certain conditions.

Abstract

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.