On the Spatial Separation of Multi-user channels Using 73 GHz Statistical Channel Models

TL;DR

This paper investigates how LOS probabilities and antenna configurations affect the spatial orthogonality of multi-user channels in mmWave environments using a statistical channel model.

Contribution

It introduces a detailed statistical mmWave MIMO channel simulator and analyzes the impact of LOS dynamics and antenna parameters on user channel orthogonality.

Findings

LOS blockage significantly impacts channel orthogonality.

Higher LOS probabilities increase spatial correlation among users.

Antenna number and spacing have less influence than LOS conditions.

Abstract

This paper focuses at the investigation of the degree of orthogonality of channels of multiple users in densely populated indoor and outdoor scenarios. For this purpose, a statistical millimeter wave (mmwave) MIMO channel simulator is carefully designed using state of the art channel models. At the mmwave frequencies, human/vehicular mobility around the mobile users may partially or completely block the communication link. This give rise to the consideration of new channel modeling parameter i.e. probability of a user to be in LOS dynamics. Higher line of sight (LOS) probabilities may increase the spatial correlation among the multiuser channels. Therefore, quantification of the spatial separation of users in different scenarios with distinct LOS probabilities is crucial and it is the subject of investigation of this paper. Additionally, the mutual orthogonality of channels by changing the number of base station (BS) antennas and inter antenna element distance (IED) have also been investigated. Analysis shows that LOS blockage of certain scenario has more impact at the degree of orthogonality among users as compared to the number of BS antennas and the spacing between the antenna elements.