Time-Gating Technique for Recreating Complex Scenarios in 5G Systems

Abstract

This article presents a novel application of the time-gating technique to the field of propagation channel study. The time-gating technique is well known in the field of antenna measurement and it is used to eliminate reflected components in outdoor measurements or anechoic chambers. In this article, we present a new measurement configuration for shielded chambers that allows to configure different propagation scenarios. In this configuration, the chamber is covered in one part with absorbers and in the other without absorbers (in order to generate reflected components). Applying the time-gating technique, we can modify, adjust and tune the reflections that a certain propagation environment has. This yields a relative control of the propagation environment in both far field and near field regions and allows to quantify the spectral efficiency and signal correlation that MIMO systems would display operating in those propagation environments.INDEX TERMS Anechoic chamber, impulse response, MIMO, recreate scenarios, reverberation chamber, time-gating.

Artificial Intelligence and Dimensionality Reduction: Tools for Approaching Future Communications

“…The presence of the metallic walls provokes that the incident wave is reflected and diffracted into several multipath components (MPCs) that reach the RX at different times. This chamber has been thoroughly described, used and validated in previous works for antenna and propagation measurements [29]- [34].…”

Artificial Intelligence and Dimensionality Reduction: Tools for approaching future communications

“…The presence of the metallic walls provokes that the incident wave is reflected and diffracted into several multipath components (MPCs) that reach the RX at different times. This chamber has been thoroughly described, used and validated in previous works for antenna and propagation measurements [28]- [33].…”

“…The chosen antennas for the acquisition are standardized gain horns fed with a WR-34 waveguide-to-coaxial transition (Flann Kband antenna Model: #21240-20) for both transmitter and receiver. Radiating patterns of these elements can be found in [28]. Prior to the acquisition process, a TOSM calibration is performed to eliminate the effect of the coaxial cable.…”

“…In our previous works [28], [29], [45]- [47], we have applied post-processing techniques in order to modify several signals in anechoic and reverberation chambers. For example, a time-domain signal acquired in the semi-anechoic and semireverberation chamber can be modified to emulate several environments [28], [29]. These works illustrate that is possible to recreate different types of communication scenarios from measurements acquired in the chambers.…”

On the Spectral Efficiency for Distributed Massive MIMO Systems

“…In this case, any movement on the BS/UE generates a totally different propagation path, which makes the correlation between channels low. A complete and detailed description of the chamber is available in [27].…”