# Channel Estimation for mmWave MIMO using sub-6 GHz Out-of-Band Information

arXiv: https://arxiv.org/abs/2311.08996 · HTML: https://mlsanity.com/paper/2311.08996/

## Key facts

- Cited by 1 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 15 Nov 2023.

## Built on by (most cited first, 1 of 1)

- [Deep Learning-Based Channel Extrapolation for Dual-Band Massive MIMO Systems](https://mlsanity.com/paper/2601.06858/) (2026)

## Abstract (arXiv)

Future wireless multiple-input multiple-output (MIMO) communication systems will employ sub-6 GHz and millimeter wave (mmWave) frequency bands working cooperatively. Establishing a MIMO communication link usually relies on estimating channel state information (CSI) which is difficult to acquire at mmWave frequencies due to a low signal-to-noise ratio (SNR). In this paper, we propose three novel methods to estimate mmWave MIMO channels using out-of-band information obtained from the sub-6GHz band. We compare the proposed channel estimation methods with a conventional one utilizing only in-band information. Simulation results show that the proposed methods outperform the conventional mmWave channel estimation method in terms of achievable spectral efficiency, especially at low SNR and high K-factor.