Downlink spectral efficiency of multi-user distributed antenna systems under a stochastic geometry model

Abstract

This paper provides an tractable analysis of the downlink spectral efficiency of multi-cell multi-user distributed antenna systems (DASs) using stochastic geometry with maximal ratio transmission (MRT) and zero-forcing (ZF) beamforming. Firstly, based on the properties of Gamma variable, the distributions of signal and interference power can be obtained. Then by modeling remote antenna units (RAUs) as a homogeneous Poisson point process (PPP), a multiple integral form of achievable rate in the downlink with perfect channel state information (CSI) is given, which enables efficient numerical integral. Finally, numerical results present the performance of a typical user, and illustrate that the proposed analytical expression matches the simulation result.