Near-field Image Transmission and EVM Measurements in Rich Scattering Environment

TL;DR

This study investigates near-field image transmission and EVM in a metal enclosure, showing that loading with RF absorbers enhances communication performance and coherence bandwidth in rich scattering environments.

Contribution

It demonstrates the impact of RF absorber loading on near-field communication performance and coherence bandwidth in a metal enclosure environment.

Findings

RF absorber loading improves OFDM-based near-field communication performance.

Loading increases coherence bandwidth in the metal enclosure.

Frequency selectivity is observed in empty enclosures, indicating lower coherence bandwidth.

Abstract

In this work, we present near-field image transmission and error vector magnitude measurement in a rich scattering environment in a metal enclosure. We check the effect of loading metal enclosure on the performance of SDR based near-field communication link. We focus on the key communication receiver parameters to observe the effect of near-field link in presence of rich-scattering and in presence of loading with RF absorber cones. The near-field performance is measured by transmitting wideband OFDM-modulated packets containing image information. Our finding suggests that the performance of OFDM based wideband near-field communication improves when the metal enclosure is loaded with RF absorbers. Near-field EVM improves when the enclosure is loaded with RF absorber cones. Loading of the metal enclosure has the effect of increased coherence bandwidth. Frequency selectivity was observed in an empty enclosure which suggests coherence bandwidth less than the signal bandwidth.