Search Results for author: Josef A. Nossek

Found 5 papers, 0 papers with code

Physically Consistent Modelling of Wireless Links with Reconfigurable Intelligent Surfaces Using Multiport Network Analysis

no code implementations23 Aug 2023 Josef A. Nossek, Dominik Semmler, Michael Joham, Wolfgang Utschick

The vast majority of research publications on RIS are focussing on system-level optimization and are based on very simplistic models ignoring basic physical laws.

Compact Uniform Circular Quarter-Wavelength Monopole Antenna Arrays with Wideband Decoupling and Matching Networks

no code implementations19 May 2021 Jonas Kornprobst, Thomas J. Mittermaier, Raimund A. M. Mauermayer, Gerhard F. Hamberger, Matthias G. Ehrnsperger, Bernhard Lehmeyer, Michel T. Ivrlac, Ulrik Imberg, Thomas F. Eibert, Josef A. Nossek

Two novel decoupling and matching networks (DMNs) in microstrip technology for three-element uniform circular arrays (UCAs) are investigated and compared to a more conventional DMN approach with simple neutralization lines.

Massive MIMO Channel Estimation with Low-Resolution Spatial Sigma-Delta ADCs

no code implementations15 May 2020 Shilpa Rao, Gonzalo Seco-Granados, Hessam Pirzadeh, Josef A. Nossek, A. Lee Swindlehurst

We consider channel estimation for an uplink massive multiple-input multiple-output (MIMO) system where the base station (BS) uses an array with low-resolution (1-2 bit) analog-to-digital converters and a spatial Sigma-Delta ($\Sigma\Delta$) architecture to shape the quantization noise away from users in some angular sector.

Quantization

Rank-one Detector for Kronecker-Structured Constant Modulus Constellations

no code implementations8 Jan 2020 Fazal-E-Asim, André L. F. de Almeida, Martin Haardt, Charles C. Cavalcante, Josef A. Nossek

To achieve a reliable communication with short data blocks, we propose a novel decoding strategy for Kronecker-structured constant modulus signals that provides low bit error ratios (BERs) especially in the low energy per bit to noise power spectral density ratio $(E_b/N_0)$.

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