Uplink Sum Rate Analysis of Massive Distributed MIMO Systems Over Composite Fading Channels

Abstract

As the number of antennas goes large in the massive multiple-input multiple-output (MIMO) scenario, the large-scale fading plays an increasingly important role in the system performance. In this paper, we investigate the uplink sum rate of a massive distributed MIMO system over composite fading channels portrayed by the Rayleigh–Lognormal (RLN) model, where both zero forcing (ZF) and ZF decision-feedback receivers are considered. By exploring a novel and generalized method based on the integral and limit theories, the sum rate is expressed as a series with regard to the negative power of the transmit antennas, which is followed by a brief discussion on the asymptotic behavior when the number of transmit antennas goes infinite. Numeral experiments testify our theoretical analysis and prove the effectiveness even when the accuracy parameter is small. The influence of the number and location of the radio ports is also discussed.