Mid-Band Extra Large-Scale MIMO System: Channel Modeling and Performance Analysis

TL;DR

This paper models and analyzes the performance of mid-band XL-MIMO systems, demonstrating their advantages in spectral efficiency and outage probability through a novel channel model and theoretical analysis.

Contribution

It introduces a new analytical channel model for mid-band XL-MIMO systems and provides performance analysis including closed-form approximations and bounds.

Findings

Mid-band XL-MIMO improves spectral efficiency and outage probability.

The proposed model captures unique mid-band channel characteristics.

Simulations confirm performance gains with increased array elements and bandwidth.

Abstract

In pursuit of enhanced quality of service and higher transmission rates, communication within the mid-band spectrum, such as bands in the 6-15 GHz range, combined with extra large-scale multiple-input multiple-output (XL-MIMO), is considered a potential enabler for future communication systems. However, the characteristics introduced by mid-band XL-MIMO systems pose challenges for channel modeling and performance analysis. In this paper, we first analyze the potential characteristics of mid-band MIMO channels. Then, an analytical channel model incorporating novel channel characteristics is proposed, based on a review of classical analytical channel models. This model is convenient for theoretical analysis and compatible with other analytical channel models. Subsequently, based on the proposed channel model, we analyze key metrics of wireless communication, including the ergodic spectral efficiency (SE) and outage probability (OP) of MIMO maximal-ratio combining systems. Specifically, we derive closed-form approximations and performance bounds for two typical scenarios, aiming to illustrate the influence of mid-band XL-MIMO systems. Finally, comparisons between systems under different practical configurations are carried out through simulations. The theoretical analysis and simulations demonstrate that mid-band XL-MIMO systems excel in SE and OP due to the increased array elements, moderate large-scale fading, and enlarged transmission bandwidth.