# Measurement Results for Millimeter Wave pure LOS MIMO Channels

## TL;DR

This paper presents measurement results for millimeter wave LOS MIMO channels, demonstrating that proper antenna spacing enables spatial multiplexing and high spectral efficiency, aligning with theoretical predictions.

## Contribution

It provides empirical measurement data validating theoretical models of LOS MIMO channels at millimeter wave frequencies, emphasizing the importance of antenna spacing.

## Key findings

- Orthogonal channel vectors observed with proper spacing
- High spectral efficiencies achieved over long distances
- Ill-conditioned matrices lead to reduced performance

## Abstract

In this paper we present measurement results for pure line-of-sight MIMO links operating in the millimeter wave range. We show that the estimated condition numbers and capacities of the measured channels are in good agreement with the theory for various transmission distances and antenna setups. Furthermore, the results show that orthogonal channel vectors can be observed if the spacing criterion is fulfilled, thus facilitating spatial multiplexing and achieving high spectral efficiencies even over fairly long distances. Spacings generating ill-conditioned channel matrices show on the other hand significantly reduced performance.