@article{MTMT:35214161,
	title = {Communication-Assisted Chirp Sequence Radar With Improved Data Rate},
	url = {https://m2.mtmt.hu/api/publication/35214161},
	author = {Alabd, Mohamad Basim and de Oliveira, Lucas Giroto and Nuss, Benjamin and Li, Yueheng and Long, Xueyun and Diewald, Axel and Galinsky, Johannes and Kollár, Zsolt and Zwick, Thomas},
	doi = {10.1109/LMWT.2024.3451413},
	journal-iso = {IEEE MICROW WIREL TE},
	journal = {IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS},
	volume = {2024},
	unique-id = {35214161},
	issn = {2771-957X},
	year = {2024},
	eissn = {2771-9588},
	pages = {1-4},
	orcid-numbers = {Alabd, Mohamad Basim/0000-0003-2799-1345; de Oliveira, Lucas Giroto/0000-0002-1362-9604; Nuss, Benjamin/0000-0002-8038-650X; Li, Yueheng/0000-0003-1387-0067; Long, Xueyun/0000-0002-6094-0542; Diewald, Axel/0000-0002-9552-6886; Kollár, Zsolt/0000-0001-6384-265X; Zwick, Thomas/0000-0002-1268-0766}
}

@article{MTMT:34720081,
	title = {Analysis of Quantization Noise in Fixed-Point HDFT Algorithms},
	url = {https://m2.mtmt.hu/api/publication/34720081},
	author = {Alrwashdeh, Monther and Czifra, Balazs and Kollár, Zsolt},
	doi = {10.1109/LSP.2024.3372782},
	journal-iso = {IEEE SIGNAL PROC LET},
	journal = {IEEE SIGNAL PROCESSING LETTERS},
	volume = {31},
	unique-id = {34720081},
	issn = {1070-9908},
	abstract = {The Discrete Fourier Transform (DFT) algorithm is widely used in signal processing and communication systems to transform the signal to the frequency-domain. As real-time signal analysis is required for fast processing, several recursive algorithms were proposed to perform the calculation with overlapping sequences in a sliding manner. One Sliding DFT (SDFT) method is the Hopping DFT (HDFT), where the DFT calculations are not evaluated sample-by-sample but with longer steps, thus further reducing the computational complexity compared to the other SDFT algorithms. This letter analyses the effect of fixed-point roundoff error in the HDFT algorithm, including the Updating Vector Transform (UVT) block. A closed-form expression for the resulting quantization noise power at the output of the HDFT algorithm is provided, which is validated through simulations. The results show that the roundoff error can be determined based on the number and size of the hops, the window size, and the number of fractional bits used in the quantization process.},
	year = {2024},
	eissn = {1558-2361},
	pages = {756-760},
	orcid-numbers = {Kollár, Zsolt/0000-0001-6384-265X}
}

@inproceedings{MTMT:35058678,
	title = {High-Accuracy Range Estimation for FC-FMCW Radar Using Phase Evaluation in Static Scenarios},
	url = {https://m2.mtmt.hu/api/publication/35058678},
	author = {Antes, Theresa and Kollár, Zsolt and Zwick, Thomas and Nuss, Benjamin},
	booktitle = {2024 IEEE Radar Conference (RadarConf24)},
	doi = {10.1109/RadarConf2458775.2024.10548517},
	unique-id = {35058678},
	year = {2024},
	pages = {1-6},
	orcid-numbers = {Kollár, Zsolt/0000-0001-6384-265X}
}

@article{MTMT:35160270,
	title = {Optical configurations for applying antireflective nanotexture on spherical lenses by ultrashort laser structuring},
	url = {https://m2.mtmt.hu/api/publication/35160270},
	author = {Csőke, Lóránt Tibor and Skoulas, Evangelos and Kollár, Zsolt},
	doi = {10.1007/s10043-024-00894-4},
	journal-iso = {OPT REV},
	journal = {OPTICAL REVIEW},
	unique-id = {35160270},
	issn = {1340-6000},
	abstract = {This paper focuses on minimizing the optical reflection on spherical fused silica lenses using femtosecond (fs) laser nanostructuring. A unique type of nanopillar formation has been observed on \textrm{SiO}_2 SiO 2 surfaces possessing antireflective properties when irradiated with a specific number of overlapping pulses, polarization, and fluence levels. Maintaining precise control over these sensitive technological parameters such as defocus and incident angle during the processing of geometrically complex shapes presents a significant challenge. This study proposes a theoretical optical arrangement to address this limitation by the design of a custom scanner system optimized for curved surfaces. The paper details the optimization process of such a bent image space (inverse-hypercentric) optical system using Zemax OpticStudio. Although the practical realization of the arrangement has not been performed, simulations are conducted to prove the functionality of the concept. Furthermore, we propose a practical method for segmented structuring of spherical surfaces based on consecutive repositioning and irradiation using an industrial robotic arm. By constructing the optical model, the necessary resolution of the segmentation has been calculated for a typical F-Theta scanner system and experimental verification has been performed.},
	keywords = {Antireflective nanotexture; Femtosecond laser nanostructuring; Inverse-hypercentric objective; Ultrashort laser structuring of spherical surfaces},
	year = {2024},
	eissn = {1349-9432},
	orcid-numbers = {Kollár, Zsolt/0000-0001-6384-265X}
}

@inproceedings{MTMT:34854562,
	title = {Performance analysis of FBMC signals in the presence of DACs with limited range and resolution},
	url = {https://m2.mtmt.hu/api/publication/34854562},
	author = {Kollár, Zsolt and Alrwashdeh, Monther and Leitold, László},
	booktitle = {2024 34th International Conference Radioelektronika (RADIOELEKTRONIKA)},
	doi = {10.1109/RADIOELEKTRONIKA61599.2024.10524059},
	unique-id = {34854562},
	abstract = {In this paper, the effect of the Digital-to-Analog Converter (DAC) with limited signal range and resolution on the performance of the Filter Bank Multi-Carrier (FBMC) signal is studied through simulation. The effects of clipping and quantization of the FBMC signal are studied through the evaluation of the signal-to-distortion and quantization ratio and power spectral density of the transmit signal. The mathematical model of the DAC considering an FBMC signal is described and evaluated. The results show that an optimal trade-off can be met in terms of the range and resolution of the DAC. © 2024 IEEE.},
	year = {2024},
	orcid-numbers = {Kollár, Zsolt/0000-0001-6384-265X}
}

@article{MTMT:34846132,
	title = {Learning-based augmentation of physics-based models: an industrial robot use case},
	url = {https://m2.mtmt.hu/api/publication/34846132},
	author = {Retzler, András and Tóth, Roland and Schoukens, M and Beintema, G I and Weigand, J and Noël, J-P and Kollár, Zsolt and Swevers, J},
	doi = {10.1017/dce.2024.8},
	journal-iso = {DCE},
	journal = {Data-Centric Engineering},
	volume = {5},
	unique-id = {34846132},
	abstract = {In a Model Predictive Control (MPC) setting, the precise simulation of the behavior of the system over a finite time window is essential. This application-oriented benchmark study focuses on a robot arm that exhibits various nonlinear behaviors. For this arm, we have a physics-based model with approximate parameter values and an open benchmark dataset for system identification. However, the long-term simulation of this model quickly diverges from the actual arm’s measurements, indicating its inaccuracy. We compare the accuracy of black-box and purely physics-based approaches with several physics-informed approaches. These involve different combinations of a neural network’s output with information from the physics-based model or feeding the physics-based model’s information into the neural network. One of the physics-informed model structures can improve accuracy over a fully black-box model.},
	year = {2024},
	eissn = {2632-6736},
	orcid-numbers = {Retzler, András/0000-0001-8635-3146; Kollár, Zsolt/0000-0001-6384-265X}
}

@article{MTMT:35191500,
	title = {Over-the-Air Synchronization for Coherent Digital Automotive Radar Networks},
	url = {https://m2.mtmt.hu/api/publication/35191500},
	author = {Sigg, Lukas and De Oliveira, Lucas Giroto and Kollár, Zsolt and Schöpfel, Jan and Braun, Tobias T. and Pohl, Nils and Zwick, Thomas and Nuss, Benjamin},
	doi = {10.1109/TRS.2024.3449333},
	journal-iso = {Trans. Rad. Sys.},
	journal = {IEEE Transactions on Radar Systems},
	volume = {2024},
	unique-id = {35191500},
	year = {2024},
	eissn = {2832-7357},
	pages = {1-13},
	orcid-numbers = {Sigg, Lukas/0009-0004-1574-9329; De Oliveira, Lucas Giroto/0000-0002-1362-9604; Kollár, Zsolt/0000-0001-6384-265X; Schöpfel, Jan/0000-0002-4009-4924; Braun, Tobias T./0000-0002-9938-5697; Pohl, Nils/0000-0001-5362-638X; Zwick, Thomas/0000-0002-1268-0766; Nuss, Benjamin/0000-0002-8038-650X}
}

@inproceedings{MTMT:35058681,
	title = {Virtual Array Transformation for Large Apertures in Cooperative Automotive Radar Networks},
	url = {https://m2.mtmt.hu/api/publication/35058681},
	author = {Sigg, Lukas and de Oliveira, Lucas Giroto and Kollár, Zsolt and Zwick, Thomas and Nuss, Benjamin},
	booktitle = {2024 IEEE Radar Conference (RadarConf24)},
	doi = {10.1109/RadarConf2458775.2024.10548262},
	unique-id = {35058681},
	year = {2024},
	pages = {1-6},
	orcid-numbers = {Kollár, Zsolt/0000-0001-6384-265X}
}

@inproceedings{MTMT:34858949,
	title = {Active Constellation Extension with Enlipping Technique for PAPR Reduction in FBMC-OQAM Systems},
	url = {https://m2.mtmt.hu/api/publication/34858949},
	author = {Mohammed Ahmed, Zahraa Tagelsir and Al-Amaireh, Husam and Kollár, Zsolt},
	booktitle = {2024 34th International Conference Radioelektronika (RADIOELEKTRONIKA)},
	doi = {10.1109/RADIOELEKTRONIKA61599.2024.10524051},
	unique-id = {34858949},
	abstract = {Filter Bank Multicarrier (FBMC) modulation, particularly the Offset Quadratic Amplitude Modulation-based (OQAM) variant, has emerged as a promising physical layer solution for future 6G wireless networks. However, FBMC-OQAM systems encounter challenges, notably the high Peak-to-Average Power Ratio (PAPR), which can lead to performance degradation. In this paper, we explore applying Active Constellation Extension (ACE) technique with the innovative enlipping technique for mitigating PAPR in FBMC-OQAM systems. This method effectively expands the outer constellation points smartly to reduce the PAPR of the FBMC signal without compromising Bit Error Rate (BER) performance. We proposed an approach, including ACE with enlipping, to address PAPR issues and compared it to clipping. Further, we evaluated ACE with enlipping against the clipping ratio (CR) and the number of iterations. Through theoretical analysis and simulation results, we demonstrate the effectiveness of this technique in reducing PAPR, thereby improving the efficiency and performance of FBMC-OQAM systems without requiring additional side information transmission. © 2024 IEEE.},
	year = {2024},
	orcid-numbers = {Kollár, Zsolt/0000-0001-6384-265X}
}

@article{MTMT:33966545,
	title = {Quantization Noise Analysis in FBMC Receivers and its Effect on the BER Performance},
	url = {https://m2.mtmt.hu/api/publication/33966545},
	author = {Alrwashdeh, Monther and Csuka, Barna and Kollár, Zsolt},
	doi = {10.1016/j.dsp.2023.104117},
	journal-iso = {DIGIT SIGNAL PROCESS},
	journal = {DIGITAL SIGNAL PROCESSING},
	volume = {140},
	unique-id = {33966545},
	issn = {1051-2004},
	year = {2023},
	eissn = {1095-4333},
	pages = {1-9},
	orcid-numbers = {Kollár, Zsolt/0000-0001-6384-265X}
}