no code implementations • 6 Feb 2024 • Md Ferdous Pervej, Andreas F. Molisch
Based on this bound, we minimize a weighted utility function for jointly configuring the controllable parameters to train the RawHFL energy efficiently under practical resource constraints.
1 code implementation • 6 Dec 2023 • Ju-Hyung Lee, Andreas F. Molisch
Large-scale channel prediction, i. e., estimation of the pathloss from geographical/morphological/building maps, is an essential component of wireless network planning.
no code implementations • 31 Oct 2023 • Ju-Hyung Lee, Chanyoung Park, Soohyun Park, Andreas F. Molisch
This study presents a novel deep reinforcement learning (DRL)-based handover (HO) protocol, called DHO, specifically designed to address the persistent challenge of long propagation delays in low-Earth orbit (LEO) satellite networks' HO procedures.
1 code implementation • 11 Oct 2023 • Lei Chu, Abdullah Alghafis, Andreas F. Molisch
We therefore consider the blockage by such dynamic objects as another semantic state.
no code implementations • 18 Aug 2023 • Anish Pradhan, J. Kartheek Devineni, Andreas F. Molisch, Harpreet S. Dhillon
This paper introduces a novel line-of-sight (LoS) $\beta-\gamma$ terahertz (THz) channel model that closely mirrors physical reality by considering radiation trapping.
no code implementations • 18 Aug 2023 • Anish Pradhan, Harpreet S. Dhillon, Fredrik Tufvesson, Andreas F. Molisch
For example, the condition of visibility of a scatterer from the perspective of a BS is different from that of an MS and depends on the height of the scatterer.
no code implementations • 19 Nov 2022 • Omer Gokalp Serbetci, Ju-Hyung Lee, Daoud Burghal, Andreas F. Molisch
We also showed that if we further augment the dataset with the proposed techniques, test accuracy is improved more than three-fold.
no code implementations • 2 Oct 2022 • Anish Pradhan, Mohamed A. Abd-Elmagid, Harpreet S. Dhillon, Andreas F. Molisch
Terahertz (THz) communication signals are susceptible to severe degradation because of the molecular interaction with the atmosphere in the form of subsequent absorption and re-radiation.
no code implementations • 3 Dec 2021 • Naveed A. Abbasi, Jorge Gomez-Ponce, Revanth Kondaveti, Ashish Kumar, Eshan Bhagat, Rakesh N S Rao, Shadi Abu-Surra, Gary Xu, Charlie Zhang, Andreas F. Molisch
The THz band (0. 1-10 THz) has attracted considerable attention for next-generation wireless communications, due to the large amount of available bandwidth that may be key to meet the rapidly increasing data rate requirements.
no code implementations • 24 Nov 2021 • Chen Huang, Ruisi He, Bo Ai, Andreas F. Molisch, Buon Kiong Lau, Katsuyuki Haneda, Bo Liu, Cheng-Xiang Wang, Mi Yang, Claude Oestges, Zhangdui Zhong
This two-part paper investigates the application of artificial intelligence (AI) and in particular machine learning (ML) to the study of wireless propagation channels.
no code implementations • 24 Nov 2021 • Chen Huang, Ruisi He, Bo Ai, Andreas F. Molisch, Buon Kiong Lau, Katsuyuki Haneda, Bo Liu, Cheng-Xiang Wang, Mi Yang, Claude Oestges, Zhangdui Zhong
To provide higher data rates, as well as better coverage, cost efficiency, security, adaptability, and scalability, the 5G and beyond 5G networks are developed with various artificial intelligence techniques.
no code implementations • 20 Oct 2021 • Chen Huang, Rui Wang, Cheng-Xiang Wang, Pan Tang, Andreas F. Molisch
We validate this model by contrasting the root-mean-square delay spread and the angular spreads of departure/arrival derived from the channel model with the outcomes directly derived from the measurements.
no code implementations • 4 Oct 2021 • Masaaki Ito, Issei Kanno, Takeo Ohseki, Kosuke Yamazaki, Yoji Kishi, Thomas Choi, Andreas F. Molisch
Cell-free massive multiple-input multiple-output (CF mMIMO) systems are expected to provide faster and more robust connections to user equipments (UEs) by cooperation of a massive number of distributed access points, and to be one of the key technologies for beyond 5G (B5G).
no code implementations • 28 Sep 2021 • Naveed A. Abbasi, Jorge Gomez-Ponce, Revanth Kondaveti, Shahid M. Shaikbepari, Shreyas Rao, Shadi Abu-Surra, Gary Xu, Charlie Zhang, Andreas F. Molisch
In this paper, we present a first extensive set of channel measurements for urban outdoor environments that are ultra-wideband (1 GHz 3dB bandwidth), and double-directional where both the transmitter and receiver are at the same height.
no code implementations • 4 Aug 2021 • Thomas Choi, Masaaki Ito, Issei Kanno, Takeo Oseki, Kosuke Yamazaki, Andreas F. Molisch
Therefore, if the "target" spectral efficiency (SE) is met, it is important to optimize the uplink EE when setting the transmit powers of the UEs.
no code implementations • 2 Jun 2021 • Anish Pradhan, J. Kartheek Devineni, Harpreet S. Dhillon, Andreas F. Molisch
The operation of Terahertz (THz) communication can be significantly impacted by the interaction between the transmitted wave and the molecules in the atmosphere.
2 code implementations • 23 May 2021 • Thomas Choi, Jorge Gomez-Ponce, Colton Bullard, Issei Kanno, Masaaki Ito, Takeo Ohseki, Kosuke Yamazaki, Andreas F. Molisch
Measurements of the propagation channel form the basis of all realistic system performance evaluations, as foundation of statistical channel models or to verify ray tracing.
2 code implementations • 13 Feb 2021 • Jorge Gomez Ponce, Thomas Choi, Naveed A. Abbasi, Aldo Adame, Alexander Alvarado, Colton Bullard, Ruiyi Shen, Fred Daneshgaran, Harpreet S. Dhillon, Andreas F. Molisch
Unmanned Aerial Vehicles (UAVs), popularly called drones, are an important part of future wireless communications, either as user equipment that needs communication with a ground station, or as base station in a 3D network.
no code implementations • 21 Dec 2020 • Daoud Burghal, Ashwin T. Ravi, Varun Rao, Abdullah A. Alghafis, Andreas F. Molisch
In this paper, we provide a comprehensive survey of ML-based localization solutions that use RF signals.
no code implementations • 29 Sep 2020 • Thomas Choi, Peng Luo, Akshay Ramesh, Andreas F. Molisch
With the growing interest in cell-free massive multiple-input multiple-output (MIMO) systems, the benefits of single-antenna access points (APs) versus multi-antenna APs must be analyzed in order to optimize deployment.
no code implementations • 7 Aug 2020 • Harsh Tataria, Mansoor Shafi, Andreas F. Molisch, Mischa Dohler, Henrik Sjöland, Fredrik Tufvesson
Mobile communications have been undergoing a generational change every ten years or so.
no code implementations • 25 Jun 2020 • Chelsea Miller, Peter J. Smith, Pawel A. Dmochowski, Harsh Tataria, Andreas F. Molisch
We use these results to examine the detrimental effects of user cluster sharing on FP behavior, and demonstrate the superior performance of the ULA as compared to the UCA and the HURA with equal inter-element spacing.
no code implementations • 18 Jun 2020 • Zheda Li, Shengqian Han, Andreas F. Molisch
In this article we compare the performance of two typical hyrbid beamforming structures for multiuser massive MIMO systems, i. e., the full- and partial-connection structures.
no code implementations • 15 Jun 2020 • Harsh Tataria, Katsuyuki Haneda, Andreas F. Molisch, Mansoor Shafi, Fredrik Tufvesson
This motivated the development of the first standardized propagation model by the European Cooperation in Science and Technology (COST) 207 working group.
1 code implementation • 6 Apr 2020 • Morteza Banagar, Harpreet S. Dhillon, Andreas F. Molisch
This paper studies the impact of unmanned aerial vehicle (UAV) wobbling on the coherence time of the wireless channel between UAVs and a ground user equipment (UE), using a Rician multi-path channel model.
Information Theory Signal Processing Information Theory
no code implementations • 24 Mar 2020 • Thomas Choi, François Rottenberg, Jorge Gomez-Ponce, Akshay Ramesh, Peng Luo, Jianzhong Zhang, Andreas F. Molisch
Estimating downlink (DL) channel state information (CSI) in frequency division duplex (FDD) massive multi-input multi-output (MIMO) systems generally requires downlink pilots and feedback overheads.
no code implementations • 29 Dec 2019 • Daoud Burghal, Naveed A. Abbasi, Andreas F. Molisch
Utilizing millimeter-wave (mmWave) frequencies for wireless communication in \emph{mobile} systems is challenging since it requires continuous tracking of the beam direction.
no code implementations • 28 Feb 2019 • Daoud Burghal, Rui Wang, Abdullah Alghafis, Andreas F. Molisch
This paper considers the band assignment (BA) problem in dual-band systems, where the basestation (BS) chooses one of the two available frequency bands (centimeter-wave and millimeter-wave bands) to communicate with the user equipment (UE).
no code implementations • 4 Dec 2018 • Zhiyuan Jiang, Ziyan He, Sheng Chen, Andreas F. Molisch, Sheng Zhou, Zhisheng Niu
Channel state information (CSI) is of vital importance in wireless communication systems.
no code implementations • 3 Dec 2018 • Zhiyuan Jiang, Sheng Chen, Andreas F. Molisch, Rath Vannithamby, Sheng Zhou, Zhisheng Niu
Knowledge of information about the propagation channel in which a wireless system operates enables better, more efficient approaches for signal transmissions.
no code implementations • 2 Oct 2018 • Daoud Burghal, Rui Wang, Andreas F. Molisch
In this work, we use a machine learning framework to provide an efficient and practical solution to the band assignment problem.