Thursday, 8 June 2023, 16:00-17:30, Room R24-R25

Session Chair: Björn Debaillie (IMEC, Belgium)

Undersampling and SNR Degradation in Practical Direct RF Sampling Systems
Dennis Osterland and Andreas Benzin (Technische Universitaet Berlin, Germany); Friedel Gerfers (Technical University Berlin, Germany); Giuseppe Caire (Technische Universität Berlin, Germany)
Advances in semiconductor technology are leading to ever-higher sampling rates for analog-to-digital converters (ADCs). In traditional systems, (cellular) radio signals had to be downconverted in the analog domain from radio frequency (RF) to baseband (BB) using direct conversion receivers (DCRs) in which the ADCs could operate at low sampling rates. Due to advances in ADC technology, modern direct RF (DRF) sampling ADCs are able to sample directly in the RF domain, opening up new application possibilities. In order to reduce the required sampling rate, it is particularly interesting to use undersampling techniques in these DRF systems. However, there are some SNR-decreasing problems associated with this approach, such as the noise folding effect, which need to be carefully considered. This paper provides a detailed investigation of practical DRF undersampling systems in theory and practice. It is shown analytically and with experimental verification that noise enhancement due to noise folding is a negligible effect in real-world DRF implementations. Furthermore, the results of this paper motivate reduced complexity and reduced power consumption DRF undersampling ADC architectures with high analog bandwidth but relatively low sampling rate.

Performance Assessment of a 5GNR D-Band CMOS Transceiver with Phase Noise Impairments
Yaya Bello and David Demmer (CEA-LETI, France); Abdelaziz Hamani (CEA, France); Alexandre Siligaris (Cea, Leti, Minatec, France); Cedric Dehos (CEA, France); Nicolas Cassiau (CEA-Leti Minatec Campus, France); Jean-Baptiste Doré (CEA-LETI, France); Jose Luis Gonzalez Jimenez (Université Grenoble-Alpes/CEA-Leti, France)
Sub-THz bands offer a strong potential with their wide available bandwidths, which makes them a promising enabler for 6G. However, the channel propagation is challenging in those bands because of severe path loss attenuation. Hardware impairments are also strong especially phase noise (PN). Besides, silicon based components, which prevail in mobile systems thanks to their low production costs, reach their limits in such high frequencies. There is thus a need for specific solutions for both system designs and signal processing techniques. The contributions of the proposed work are multiple: (i) based on a CMOS D-Band transceiver, we measure and derive the stochastic properties of the transceiver PN and, (ii) we investigate and evaluate the performance of signal processing PN estimation and compensation techniques, with the measured PN for OFDM and DFT-s-OFDM waveforms. We demonstrate that the use of the proposed algorithm based on the statistic properties of the correlated nature of the PN, leads to a significant performance gain in DFT-s-OFDM systems. We consider a real measurement of the PN power spectral density and standard and extended 5G-NR numerologies.

D-Band Antenna and Array Designs for 5G Applications
Vladimir Ermolov, Mikko Kaunisto, Antti E. I. Lamminen, Jussi Säily and Mikko Kantanen (VTT Technical Research Centre of Finland, Finland); Juha Ala-Laurinaho (Aalto University, Finland); Mario Schober (Advanced Technologies and Solutions, Austria); Alberto Chico (TTI Norte, Spain)
This paper presents the design, manufacturing and characterization of a parasitic patch microstrip D-band antenna and a 16-element segmented antenna array on a multilayer printed circuit board (PCB) targeted for 5G applications. The antennas are manufactured using printed circuit board technology with semiadditive processing (mSAP) of conductors on a multilayered substrate. The measured maximum gains for a single antenna and a 16-element array are respectively 9 dBi and 16.5 dBi at 157 GHz. The measured antenna array input matching bandwidth is 20 GHz.

Scalable E-Band Waveguide Array Antennas for 5G and Beyond
Adrian Gomez-Torrent, James Campion and Bernhard Beuerle (TeraSi AB, Sweden)
This paper presents an E-band array antenna design for wireless applications. Three different versions of the array are presented ranging from 20 dBi to 32 dBi directivity. The broadband design makes them suitable to operate on both E-band channels simultaneously. The antennas are extremely low profile with a total package thickness of 3.25 mm and their footprint is defined by the aperture size. These high-frequency array antennas are enabled by TeraSi’s silicon-based fabrication technology, which supports high-performance RF system-inpackage in large volumes and at a low cost. The designs presented here are easily scalable both in volume and operational frequency, making them highly suited to 5G and future 6G network applications.

A Wideband Reduced Form Factor Antenna for 5G SAWAP Applications
Tiago E. S. Oliveira (Polytechnic of Leiria & Instituto de Telecomunicações, Portugal); João Ricardo Reis (Instituto de Telecomunicações and Polytechnic Institute of Leiria, Portugal); Telmo R. Fernandes (IPLeiria / Institute of Telecommunications & ESTG/IT-DL, Portugal); Samuel Rocha Madail and José Salgado (Altice Labs. SA, Portugal); Rafael F. S. Caldeirinha (Polytechnic Institute of Leiria & Instituto de Telecomunicações, Portugal)
In this paper, a wideband antenna for 5G SmallArea Wireless Access Points (SAWAPs) applications is presented. The proposed antenna is designed to fulfil strict project requirements, namely, to operate in the 5G FR1 n78 frequency band, and to have a reduced form factor, so it can easily be integrated in existing street furniture. The proposed antenna layout resembles a typical inset feed microstrip patch with etched ground plane. In particular, the slot opened in the bottom plane allows to improve the bandwidth up to 15%, when comparing with a standard microstrip patch antenna. A thorough simulation workout is presented to better comprehend how the main design parameters affect the antenna performance, and ultimately, to properly tune the antenna. After optimisation in CST MWS, an antenna with overall dimension of 30 × 30 mm2, designed in Rogers 4350B substrate, presents a total bandwidth of 585 MHz (15%), defined from 3.35 to 3.935 GHz, with an omnidirectional radiation pattern with a realised gain of 2.34 dBi. Furthermore, the proposed antenna layout is also optimised to operate inside a plastic enclosure backed by a metallic plate. According to simulations, the final antenna model presents an optimised bandwidth of 400 MHz and a realized gain of 5.03 dBi, at 3.6 GHz.

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