29 citations · 172 across the 19 of their papers we have counts for
19 papers
RIS-Assisted NOMA with Partial CSI and Mutual Coupling: A Machine Learning Approach
Bile Peng, Karl-Ludwig Besser, Shanpu Shen +5
Non-orthogonal multiple access (NOMA) is a promising multiple access technique. Its performance depends strongly on the wireless channel property, which can be enhanced by reconfig…
On the Distribution of a Two-Dimensional Random Walk with Restricted Angles
Karl-Ludwig Besser
In this paper, we derive the distribution of a two-dimensional (complex) random walk in which the angle of each step is restricted to a subset of the circle. This setting appears i…
Distributed Combinatorial Optimization of Downlink User Assignment in mmWave Cell-free Massive MIMO Using Graph Neural Networks
Bile Peng, Bihan Guo, Karl-Ludwig Besser +6
Millimeter wave (mmWave) cell-free massive MIMO (CF mMIMO) is a promising solution for future wireless communications. However, its optimization is non-trivial due to the challengi…
RISnet: A Domain-Knowledge Driven Neural Network Architecture for RIS Optimization with Mutual Coupling and Partial CSI
Bile Peng, Karl-Ludwig Besser, Shanpu Shen +5
Space-division multiple access (SDMA) plays an important role in modern wireless communications. Its performance depends on the channel properties, which can be improved by reconfi…
Learning Based Dynamic Cluster Reconfiguration for UAV Mobility Management with 3D Beamforming
Irshad A. Meer, Karl-Ludwig Besser, Mustafa Ozger +3
In modern cell-less wireless networks, mobility management is undergoing a significant transformation, transitioning from single-link handover management to a more adaptable multi-…
Reinforcement Learning Based Dynamic Power Control for UAV Mobility Management
Irshad A. Meer, Karl-Ludwig Besser, Mustafa Ozger +2
Modern communication systems need to fulfill multiple and often conflicting objectives at the same time. In particular, new applications require high reliability while operating at…
RISnet: A Scalable Approach for Reconfigurable Intelligent Surface Optimization with Partial CSI
Bile Peng, Karl-Ludwig Besser, Ramprasad Raghunath +2
The reconfigurable intelligent surface (RIS) is a promising technology that enables wireless communication systems to achieve improved performance by intelligently manipulating wir…
Approaching Globally Optimal Energy Efficiency in Interference Networks via Machine Learning
Bile Peng, Karl-Ludwig Besser, Ramprasad Raghunath +1
This work presents a machine learning approach to optimize the energy efficiency (EE) in a multi-cell wireless network. This optimization problem is non-convex and its global optim…
QMKPy: A Python Testbed for the Quadratic Multiple Knapsack Problem
Karl-Ludwig Besser, Eduard A. Jorswieck
QMKPy provides a Python framework for modeling and solving the quadratic multiple knapsack problem (QMKP). It is primarily aimed at researchers who develop new solution algorithms…
Multi-User Frequency Assignment for Ultra-Reliable mmWave Two-Ray Channels
Karl-Ludwig Besser, Eduard A. Jorswieck, Justin P. Coon
We consider a multi-user two-ray ground reflection scenario with unknown distances between transmitter and receivers. By using two frequencies per user in parallel, we can mitigate…
An Efficient Frequency Diversity Scheme for Ultra-Reliable Communications in Two-Path Fading Channels
Karl-Ludwig Besser, Eduard A. Jorswieck, Justin P. Coon
We consider a two-ray ground reflection scenario with unknown distance between transmitter and receiver. By utilizing two frequencies in parallel, we can mitigate possible destruct…
Securing Data in Multimode Fibers by Exploiting Mode-Dependent Light Propagation Effects
Stefan Rothe, Karl-Ludwig Besser, David Krause +4
Multimode fibers hold great promise to advance data rates in optical communications but come with the challenge to compensate for modal crosstalk and mode-dependent losses, resulti…
Reconfigurable Intelligent Surface Phase Hopping for Ultra-Reliable Communications
Karl-Ludwig Besser, Eduard A. Jorswieck
We introduce a phase hopping scheme for reconfigurable intelligent surfaces (RISs) in which the phases of the individual RIS elements are randomly varied with each transmitted symb…
Achievable Physical-Layer Secrecy in Multi-Mode Fiber Channels using Artificial Noise
Eduard Jorswieck, Andrew Lonnstrom, Karl-Ludwig Besser +2
Reliable and secure communication is an important aspect of modern fiber optic communication. In this work we consider a multi-mode fiber (MMF) channel wiretapped by an eavesdroppe…
On Fading Channel Dependency Structures with a Positive Zero-Outage Capacity
Karl-Ludwig Besser, Pin-Hsun Lin, Eduard A. Jorswieck
With emerging wireless technologies like 6G, many new applications like autonomous systems evolve which have strict demands on the reliability and latency of data communications. I…
Copula-Based Bounds for Multi-User Communications -- Part II: Outage Performance
Karl-Ludwig Besser, Eduard A. Jorswieck
In the first part of this two-part letter, we introduced methods to study the impact of dependency on the expected value of functions of two random variables. In this second part,…
Copula-Based Bounds for Multi-User Communications -- Part I: Average Performance
Eduard A. Jorswieck, Karl-Ludwig Besser
Statistically independent or positively correlated fading models are usually applied to compute the average performance of wireless communications. However, there exist scenarios w…
Bounds on the Secrecy Outage Probability for Dependent Fading Channels
Karl-Ludwig Besser, Eduard A. Jorswieck
The amount of sensitive data, which is transmitted wirelessly will increase with future technologies. This raises many questions about secure data transmission. Besides cryptograph…
Reliability Bounds for Dependent Fading Wireless Channels
Karl-Ludwig Besser, Eduard A. Jorswieck
Unreliable fading wireless channels are the main challenge for strict performance guarantees in mobile communications. Diversity schemes including massive number of antennas, huge…