PHY6 – Near-field, THz and advanced communications
Thursday, 4 June 2026, 16:30-18:00, room Sala 3 (1st floor)
Session Chair: Adam Flizikowski (IS-Wireless, PL)
Evaluation of Path Loss Within an Indoor Corridor in the 300 GHz — 330 GHz Frequency Range
Juan E. Galeote-Cazorla (University of Granada, Spain); Alejandro Ramírez-Arroyo (Aalborg University, Denmark); Cristian Gutiérrez (Pontificia Universidad Católica de Valparaíso, Chile); Álvaro Liébana-Bolívar (University of Granada, Spain); Mauricio Rodríguez (Pontificia Universidad Católica de Valparaíso, Chile); Juan Valenzuela-Valdés (Universidad de Granada, Spain)
The advent of the future sixth-generation will bring new revolutionary services such as haptics, extended reality or telemedicine are emerging. These kind of systems requires of higher performance than the provided by the current fifth-generation. In order to overcome the limitations, among all the approaches proposed in the literature, to operate at frequencies in within the terahertz bands stands out as one of the most promising. The available bandwidth is larger in comparison to millimeter wave bands, but the propagation conditions are more challenging. Path loss is notably higher and transmission, reflection and diffraction suffer of a deep attenuation. In consequence, the terahertz bands are envisioned to deploy systems operating in short-range scenarios. The canonical examples of short-range scenario are the indoor environments, where distances between transmitter and receiver are reduced. Among others, these scenarios include offices, laboratories, houses, room or corridors; which have been widely studied in the millimeter wave bands. In this work, measurements of the propagation channel within corridors are presented. Then, path loss is studied and modeled in the frequency band from 300 GHz to 330 GHz. The alpha-beta-gamma model reveals that path loss is governed by a loss exponent of 1.8, which is tied to a guiding behavior within the corridor that reduces the overall attenuation.
FR3 for 6G Networks: A Comparative Study Against FR1 and FR2 Across Diverse Environments
Fahimeh Aghaei (Oulu University, Finland); Mehdi Monemi and Mehdi Rasti (University of Oulu, Finland); Murat Uysal (NYU Abu Dhabi, United Arab Emirates)
Motivated by increasing wireless capacity demands and 6G advancements, the newly defined Frequency Range 3 (FR3, 7.125-24.25 GHz), also known as the upper mid-band, has emerged as a promising spectrum candidate. It offers a balance between the large bandwidth potential of millimeter-wave bands and the favorable propagation characteristics of sub-6 GHz bands. As a result, the upper mid-band presents a strong opportunity to enhance both coverage and capacity, particularly for 6G systems and Cellular Vehicle-to-Base Station (C-V2B) communications. Harnessing this potential, however, requires addressing key technical challenges through accurate and realistic channel modeling across diverse urban environments, including Suburban, Urban, and HighRise Urban scenarios. To this end, we employ a ray-tracing tool to characterize downlink propagation and enable detailed channel modeling for reliable C-V2B links. We evaluate data rate performance across FR1 (sub-6 GHz), FR3, and FR2 (mmWave) bands using antenna array configurations designed for different urban environments. The results show that, under equal aperture sizes, FR3 achieves higher data rates than FR2 for cell-edge User Equipment (UEs) in both interference-free and full-interference scenarios, indicating that the additional array gain at mmWave is insufficient to fully compensate for the severe experienced path loss. Integrating one-hand-grip pedestrian UEs model into ray tracer shows that transitioning from vehicular to pedestrian UEs results in negligible differences in coverage probability (about 1%-3%) across all frequencies, with the minimum differences observed in FR3, particularly at 8.2 GHz.
Mobile near-Field THz Communications: Towards Omnidirectional Receivers?
Brandon Honan (SUNY Polytechnic Institute, USA); Justin D Osmond (SUNY Polytechnic Institute, USA & NA, USA); Priyangshu Sen (SUNY Polytechnic Institute, USA); Arjuna Madanayake (Florida International University, USA); Arjun Singh (SUNY Polytechnic Institute, USA)
This paper presents an experimentally validated characterization of mobile terahertz (THz) communication systems in the massive near-field. Gaussian Beams are utiilzed to evaluate near-field beamforming with electromagentic wave theory. It is shown that the Friis path loss does not hold for broadside setups, and the physics of near-field THz wireless results in asymmetrical channels for the up-link or down-link systems. Further, it shown that the effect of the receiver size drastically determines the angular resilience of THz wireless links, while the size of the transmitter drastically effects the multipath effects. As such, a communication system which has a large transmitter and a small receiver is determined to have huge pay-offs for resilient THz communications in the future generation of wireless networks.
Monostatic Scattering Array with Joint Distance-Angle Optimization for near-Field Full-Duplex Communications
Yuanzhe Gong and Tho Le-Ngoc (McGill University, Canada)
This paper proposes a joint distance-angle perturbation-based beamforming optimization algorithm for near-field full-duplex (FD) communications. By searching for beamfocusing distances and angles in the vicinity of the desired downlink (DL) and uplink (UL) user locations, the proposed scheme effectively suppresses self-interference (SI) while preserving the desired signal beamforming gain. Illustrative results based on SI channels generated from full-wave simulations of monostatic scattering array configurations, considering a spherical-wavefront model in the radiative near-field region, demonstrate a significant reduction in beam-level SI. With less than 3dB variation in the desired signal gain, the proposed method achieves an average 97.7 dB beamforming isolation enhancement. More than 75% and 79% of the tested DL-UL location pairs achieve beam-level SI better than -100 dB and -60 dB, respectively, which ensures reliable monostatic FD operation. In addition, a comprehensive investigation is conducted to assess the effectiveness of the location-perturbation strategy for different user distances from the array.
Sub-THz PAPR Reduction: From Algorithm Design to Power Modeling
Abdur Rahman Mohamed Ismail (University of Ghent, Belgium & IMEC, Belgium); Claude Desset (IMEC, Belgium); Mamoun Guenach (Imec, Leuven & Alcatel Lucent, Belgium); Andre Bourdoux (IMEC, Belgium)
Single carrier (SC) modulation is a promising waveform for sub-THz communications due to its inherently low peak-to-average power ratio (PAPR). However, in multi-antenna transmitters, multi-user MIMO precoding significantly increases the PAPR of SC signals. This effect can be mitigated through dedicated PAPR reduction algorithms, yet the associated costs are often overlooked. In this work, we analyze the power consumption of a recently proposed peak reduction signal (PRS)-based PAPR reduction technique, in which the PRS is transmitted alongside the precoded information symbols. Existing studies primarily focus on designing the PRS to maximize PAPR reduction, without assessing whether the benefits justify the associated cost. We address this gap by quantifying both the power savings achieved through the PAPR reduction and the additional power required to design and transmit the PRS. This allows us to evaluate the net power savings. Our analysis reveals that net power savings are \obtained only for specific PRS design configurations.
