Spectral Efficiency Analysis of Network-Assisted Full Duplexing for Large-Scale Distributed Antenna Systems

In this paper, a large-scale distributed antenna system (DAS) with network-assisted full duplexing (NAFD) is investigated. Our model assumes that imperfect channel state information (CSI) is available and channels have independent spatial correlations. Based on large dimensional random matrix theory (RMT), the deterministic equivalent expressions for the ergodic uplink (UL) sum-rate with minimum-mean-square-error (MMSE) receiver as well as the ergodic downlink (DL) sum-rate with regularized zero-forcing (RZF) beamforming are derived. With the cancellation of downlink-to- uplink interference, the spectral efficiency of NAFD system is further improved. Numerical simulations indicate that under various environment settings, the deterministic equivalent results are accurate in both large-scale system and system with finite number of antennas.