PHY (Session2) – THz, mmW

Wednesday, 8 June 2022, 16:00-17:30, Room A304

Session Chair: Jean-Baptiste Doré (CEA-LETI, FR)

Sub-TeraHertz Modular Array Layout Optimization Under Fabrication Constraints

Saeid Khalili Dehkordi (TU Berlin, Germany); Oliver Schwanitz (Fraunhofer IZM, Germany); Mostafa Marandi (TU Dresden, Germany); Michael Kaiser, Thi Huyen Le and Ivan Ndip (Fraunhofer IZM, Germany); Giuseppe Caire (Technische Universität Berlin, Germany)
Millimeter wave (mmWave) and sub-TeraHertz (s-THz) multi-user multiple-input multiple-output (MU-MIMO) communications operating in the frequency spectrum (30-300GHz) have already been identified as the most promising candidate for the second phase of 5G and Beyond (5GB) wireless systems aiming to achieve broadband data communications at rates higher than (1 Gb/s) while operating in very dense urban small-cell environments. Due to the presence of strong isotropic pathloss in mmWave/s-THz frequencies, high antenna gains realized through large antenna arrays will be required to mitigate these effects. The small wavelengths under which mmWave and s-THz systems operate, allow for integration of more compact antenna elements. However, the fabrication of such antennas poses challenges such as positioning tolerance. In this work, we introduce a novel modular array synthesis approach and further investigate the effect of non-ideal element/module positions within an array and provide an optimization framework to minimize the expected synthesized array pattern taking positioning tolerances into account. Furthermore, we use the realized element pattern of the proposed D-Band patch element with an RF bandwidth of over 10 GHz to demonstrate the results of the proposed optimization algorithm.

On the Potential of Using Sub-THz Frequencies for Beyond 5G

Oskari Tervo (Nokia, Finland); Ilmari Nousiainen (University of Oulu, Finland); Ismael Peruga (Nokia, Finland); Esa Tiirola and Jari Hulkkonen (Nokia Bell Labs, Finland)
This paper studies studies the potential of using above 71GHz frequencies for 5G-Advanced or later in 6G. More specifically, the focus is to analyze what could be needed in terms of waveform and numerologies. The results suggest that higher baseline subcarrier spacings (SCSs) may be needed when moving above 71GHz, to fulfill the need for higher required bandwidths and phase noise robustness. The required SCS depends on carrier frequency and modulation order. It is also illustrated that single-carrier waveforms, especially Known Tail Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (KT-DFT-s-OFDM) waveform is a potential candidate to be used in 5G-Advanced or 6G for sub-THz frequencies due to its robustness to phase noise, lower output power backoff and flexible adaptation of head and tail lengths.

Material Reflection Measurements in Centimeter and Millimeter Wave Ranges for 6G Wireless Communications

Mohamed Abdelbasset Aliouane (Telecom Paris, Institut Polytechnique de Paris & Orange Labs, France); Jean-Marc Conrat (Orange Labs, France); Jean-Christophe Cousin (Telecom ParisTech, France); Xavier Begaud (LTCI, Télécom Paris, Institut Polytechnique de Paris, France)
Research in the field of telecommunication is moving towards 6G. Upper mm Wave frequencies (100-300 GHz) are seen as a promising band for 6G. ITU recommendations on material characteristics are limited to 100 GHz. This study aims to further extend the currently existing knowledge on wave-material interaction and make the link between below and above 100 GHz frequencies by providing reflection measurements from 2 to 170 GHz. The material reflection coefficients of seventeen different materials e.g. glass, wood, aerated concrete, and polystyrene are continuously reported along the measured band. The measurement setup is based on a vector network analyzer with millimeter wave extension modules connected starting from 50 GHz.

Mm-Wave Massive MIMO Channel Sounding in Industrial IoT Scenarios

Alfred Mudonhi (CEA Leti and Universite Catholique de Louvain & Universite Grenoble-Alpes, France); Gloria Makhoul (CEA-LETI, France); Marina Lotti (University of Bologna, Italy & CEA Leti, France); Raffaele D’Errico (CEA, LETI & Université Grenoble-Alpes, France); Claude Oestges (Université Catholique de Louvain, Belgium)
This paper presents results of massive multi-input multi-output (mMIMO) channel characteristics based on measurements carried out in an industrial environment at frequency ranges from 26 GHz to 30 GHz. Three different propagation conditions were considered, i.e. line-of-sight (LOS), obstructed LOS (OLOS) and non-LOS (NLOS), and two types of virtual antenna arrays were measured using monopole antennas, i.e. the planar and cubic arrays composed of 21×21 and 5x5x5 elements, respectively. The main results on large-scale parameters as well as an analysis on specular and dense multi-path components are then presented. Finally, the spatial correlation properties over a large antenna arrays were investigated in LOS and OLOS scenarios.

Diffuse Modular Honeycomb Passive Reflector for Efficient mmWave Propagation in Indoor Environments

J. Samuel Romero-Peña (Universitat Politècnica de València, Spain); Narcis Cardona (The Polytechnic University of Valencia, Spain)
This paper describes the design and prototyping of a mmWave passive reflector, aimed to improve the radio propagation conditions in indoor environments when mmWave band is used. The high attenuation to mmWave radio caused by obstacles and humans do not limit the applicability of this band to line-of-sight links only, since reflections and diffuse scattering on the environment surfaces contribute with some energy to the received power even for non-line-of sight. The objective of the reflector described in this paper is to reinforce such contributions in indoor environments, creating paths towards receivers that are in NLOS to the transmitter site, but focusing to obstructed areas instead of creating specular reflections. The final reflector design has a hexagonal shape that allows it to be mechanically robust and easily assembled. It is also worth noting that it was manufactured with a simple and costless procedure.

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