Aging Channel Modeling and Transmission Block Size Optimization for Massive MIMO Vehicular Networks in Non-Isotropic Scattering Environment

TL;DR

This paper models aging channels in massive MIMO vehicular networks considering non-isotropic scattering, deriving spectral efficiency expressions and optimizing transmission block size for different urban scenarios.

Contribution

It introduces a novel aging channel model for non-isotropic environments and provides empirical models for optimal transmission block size in vehicular networks.

Findings

Spectral efficiency expressions for MR and MMSE combining.

Optimal transmission block size models for ASE maximization.

Performance evaluation in freeway and urban scenarios.

Abstract

We investigate the effect of channel aging on multi-cell massive multiple-input multiple-output (MIMO) vehicular networks in a generic non-isotropic scattering environment. Based on the single cluster scattering assumption and the von Mises distribution assumptions of the scatterers' angles, an aging channel model is established to capture the joint effect of spatial and temporal correlations resulting from different angular spread conditions in various application scenarios. Expressions of the user uplink transmission spectral efficiency (SE) are derived for maximum ratio (MR) and minimum mean square error (MMSE) combining. Through numerical studies, the area spectral efficiency (ASE) performance of the network is evaluated in freeway and urban Manhattan road grid scenarios, and easy-to-use empirical models for the optimal transmission block size for ASE maximization are obtained for the evaluated scenarios.