Exploiting Out-of-Band Information for Millimeter-Wave MIMO Channel Estimation: Performance in Static and Dynamic Scenarios

TL;DR

This paper investigates how out-of-band sub-6 GHz information can improve millimeter-wave MIMO channel estimation, demonstrating significant spectral efficiency gains in static and dynamic environments.

Contribution

It introduces a method to exploit sub-6 GHz out-of-band information for enhanced mmWave MIMO channel estimation performance.

Findings

Out-of-band information improves spectral efficiency in static scenarios.

Performance gains are observed in dynamic environments.

Simulation results confirm the effectiveness of the proposed approach.

Abstract

To support the high data rates for latency-critical applications, future wireless systems will employ fully digital beamforming multiple-input multiple-output (MIMO) architectures at millimeter wave (mmWave) frequencies. Moreover, mmWave MIMO deployments will coexist with conventional sub-6 GHz MIMO systems, creating opportunities to exploit out-of-band sub-6 GHz information to enhance channel estimation at mmWave frequencies. In this work, we analyze the pilot-aided channel estimation performance of mmWave MIMO systems under various pilot configurations in both static and dynamic environments. We evaluate the system performance in terms of spectral efficiency (SE) for line-of-sight and non-line-of-sight propagation conditions. Simulation results show that incorporating out-of-band sub-6 GHz information yields notable SE gains in both static and dynamic scenarios.