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.
@article{arxiv.2604.02936,
title = {Exploiting Out-of-Band Information for Millimeter-Wave MIMO Channel Estimation: Performance in Static and Dynamic Scenarios},
author = {Faruk Pasic and Mariam Mussbah and Stefan Schwarz and Markus Rupp and Christoph F. Mecklenbräuker},
journal= {arXiv preprint arXiv:2604.02936},
year = {2026}
}
Comments
Accepted to be presented at the European Conference on Networks and Communications and the 6G Summit (EuCNC & 6G Summit), 2026