Oliver Lang
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View article: Estimators and Performance Bounds for Short Periodic Pulses
Estimators and Performance Bounds for Short Periodic Pulses Open
In many industrial applications, signals with short periodic pulses, caused by repeated steps in the manufacturing process, are present, and their fundamental frequency or period may be of interest. Fundamental frequency estimation is in m…
View article: Optimum and Adaptive Complex-Valued Bilinear Filters
Optimum and Adaptive Complex-Valued Bilinear Filters Open
The identification of nonlinear systems is a frequent task in digital signal processing. Such nonlinear systems may be grouped into many sub-classes, whereby numerous nonlinear real-world systems can be approximated as bilinear (BL) models…
View article: Telecom Light-Emitting Diodes Based on Nanoconfined Self-Assembled Silicon-Based Color Centers
Telecom Light-Emitting Diodes Based on Nanoconfined Self-Assembled Silicon-Based Color Centers Open
Silicon color centers (SiCCs) have recently emerged as potential building blocks for light emitters in Si photonics, quantum emitters with spin storage capabilities, and Si-based quantum repeaters. We have recently developed a noninvasive …
View article: Tx and Rx IQ Imbalance Compensation for JCAS in 5G NR
Tx and Rx IQ Imbalance Compensation for JCAS in 5G NR Open
Beside traditional communications, joint communications and sensing (JCAS) is gaining increasing relevance as a key enabler for next-generation wireless systems. The ability to accurately transmit and receive data is the basis for high-spe…
View article: Improved Range and Velocity Estimation in JCAS Using Apodization-Enhanced Optimization
Improved Range and Velocity Estimation in JCAS Using Apodization-Enhanced Optimization Open
View article: Bi-Linear Homogeneity Enforced Calibration for Pipelined ADCs
Bi-Linear Homogeneity Enforced Calibration for Pipelined ADCs Open
Pipelined analog-to-digital converters (ADCs) are key enablers in many state-of-the-art signal processing systems with high sampling rates. In addition to high sampling rates, such systems often demand a high linearity. To meet these chall…
View article: Virtual Array Design via Hole-Free Sparse Array with Reduced Mutual Coupling Effect
Virtual Array Design via Hole-Free Sparse Array with Reduced Mutual Coupling Effect Open
View article: Relaxed Multi-Tx DDM Online Calibration
Relaxed Multi-Tx DDM Online Calibration Open
In multiple-input and multiple-output (MIMO) radar systems based on Doppler-division multiplexing (DDM), phase shifters are employed in the transmit paths and require calibration strategies to maintain optimal performance all along the rad…
View article: Thermal deformation monitoring of a highway bridge: combined analysis of geodetic and satellite-based InSAR measurements with structural simulations
Thermal deformation monitoring of a highway bridge: combined analysis of geodetic and satellite-based InSAR measurements with structural simulations Open
Structural Health Monitoring (SHM) of civil engineering structures is experiencing an increasing progress in the last decades. The present work focuses on the static behavior of a highway bridge due to environmental temperature effects. Th…
View article: SICNN: Soft Interference Cancellation Inspired Neural Network Equalizers
SICNN: Soft Interference Cancellation Inspired Neural Network Equalizers Open
In recent years data-driven machine learning approaches have been extensively studied to replace or enhance traditionally model-based processing in digital communication systems. In this work, we focus on equalization and propose a novel n…
View article: Effects of Doppler-Division Multiplexing on OFDM Joint Sensing and Communication Systems
Effects of Doppler-Division Multiplexing on OFDM Joint Sensing and Communication Systems Open
A promising waveform candidate for future joint sensing and communication systems is orthogonal frequency-division multiplexing (OFDM). For such systems, supporting multiple transmit antennas requires multiplexing methods for the generatio…
View article: Doppler Aliasing in OFDM Radar: A Method for Reducing the ADC Sampling Frequency Without Losing Range Resolution
Doppler Aliasing in OFDM Radar: A Method for Reducing the ADC Sampling Frequency Without Losing Range Resolution Open
The orthogonal frequency-division multiplexing (OFDM) waveform is especially suited for joint sensing and communication applications and has raised attention for radar-driven applications as well. For radar applications, the signal bandwid…
View article: OFDM-based Waveforms for Joint Sensing and Communications Robust to Frequency Selective IQ Imbalance
OFDM-based Waveforms for Joint Sensing and Communications Robust to Frequency Selective IQ Imbalance Open
Orthogonal frequency-division multiplexing (OFDM) is a promising waveform candidate for future joint sensing and communication systems. It is well known that the OFDM waveform is vulnerable to in-phase and quadrature-phase (IQ) imbalance, …
View article: Neural Network Approaches for Data Estimation in Unique Word OFDM Systems
Neural Network Approaches for Data Estimation in Unique Word OFDM Systems Open
Data estimation is conducted with model-based estimation methods since the beginning of digital communications. However, motivated by the growing success of machine learning, current research focuses on replacing model-based data estimatio…
View article: Bi-Linear Homogeneity Enforced Calibration for Pipelined ADCs
Bi-Linear Homogeneity Enforced Calibration for Pipelined ADCs Open
Pipelined analog-to-digital converters (ADCs) are key enablers in many state-of-the-art signal processing systems with high sampling rates. In addition to high sampling rates, such systems often demand a high linearity. To meet these chall…
View article: SICNN: Soft Interference Cancellation Inspired Neural Network Equalizers
SICNN: Soft Interference Cancellation Inspired Neural Network Equalizers Open
In recent years data-driven machine learning approaches have been extensively studied to replace or enhance traditionally model-based processing in digital communication systems. In this work, we focus on equalization and propose a novel n…
View article: Complex-valued Adaptive System Identification via Low-Rank Tensor Decomposition
Complex-valued Adaptive System Identification via Low-Rank Tensor Decomposition Open
Machine learning (ML) and tensor-based methods have been of significant interest for the scientific community for the last few decades. In a previous work we presented a novel tensor-based system identification framework to ease the comput…
View article: Doppler-Division Multiplexing for MIMO OFDM Joint Sensing and Communications
Doppler-Division Multiplexing for MIMO OFDM Joint Sensing and Communications Open
A promising waveform candidate for future joint sensing and communication systems is orthogonal frequencydivision multiplexing (OFDM). For such systems, supporting multiple transmit antennas requires multiplexing methods for the generation…
View article: Enhanced Nonlinear System Identification by Interpolating Low-Rank Tensors
Enhanced Nonlinear System Identification by Interpolating Low-Rank Tensors Open
Function approximation from input and output data is one of the most investigated problems in signal processing. This problem has been tackled with various signal processing and machine learning methods. Although tensors have a rich histor…
View article: Homogeneity Enforced Calibration of Stage Nonidealities for Pipelined ADCs
Homogeneity Enforced Calibration of Stage Nonidealities for Pipelined ADCs Open
Pipelined adc are fundamental components of various signal processing systems requiring high sampling rates and a high linearity. Over the past years, calibration techniques have been intensively investigated to increase the linearity In t…
View article: Neural Network Approaches for Data Estimation in Unique Word OFDM Systems
Neural Network Approaches for Data Estimation in Unique Word OFDM Systems Open
Data estimation is conducted with model-based estimation methods since the beginning of digital communications. However, motivated by the growing success of machine learning, current research focuses on replacing model-based data estimatio…
View article: Range-Division Multiplexing for MIMO OFDM Joint Radar and Communications
Range-Division Multiplexing for MIMO OFDM Joint Radar and Communications Open
An orthogonal frequency-division multiplexing (OFDM) waveform enables simultaneous radar sensing and communications. In the multiple-input multiple-output (MIMO) case with several transmit (Tx) antennas, multiplexing the transmit signals i…
View article: Homogeneity Enforced Calibration of Stage Nonidealities for Pipelined ADCs
Homogeneity Enforced Calibration of Stage Nonidealities for Pipelined ADCs Open
Pipelined analog-to-digital converters (ADCs) are fundamental components of various signal processing systems requiring high sampling rates and a high linearity. Over the past years, calibration techniques have been intensively investigate…
View article: OFDM Radar With Subcarrier Aliasing—Reducing the ADC Sampling Frequency Without Losing Range Resolution
OFDM Radar With Subcarrier Aliasing—Reducing the ADC Sampling Frequency Without Losing Range Resolution Open
Many radar applications require a high range resolution, entailing the necessity for a large signal bandwidth. When employing an orthogonal frequency-division multiplexing (OFDM) radar system in its standard implementation, the radar syste…
View article: A new class of self‐normalising LMS algorithms
A new class of self‐normalising LMS algorithms Open
Many researchers and practitioners make heavy use of the least mean squares (LMS) algorithm as an efficient adaptive filter suitable for a multitude of problems. Despite being versatile and efficient, a drawback of this algorithm is that t…
View article: SICNet—Low Complexity Sample Adaptive Neural Network-Based Self-Interference Cancellation in LTE-A/5G Mobile Transceivers
SICNet—Low Complexity Sample Adaptive Neural Network-Based Self-Interference Cancellation in LTE-A/5G Mobile Transceivers Open
The limited transmitter-to-receiver stop-band isolation of the duplexers in long term evolution (LTE) and 5G/NR frequency division duplex transceivers induces leakage signals from the transmitter(s) (Tx) into the receiver(s) (Rx). These le…
View article: Table of Contents
Table of Contents Open
View article: Adaptive System Identification via Low-Rank Tensor Decomposition
Adaptive System Identification via Low-Rank Tensor Decomposition Open
Tensor-based estimation has been of particular interest of the scientific community for several years now. While showing promising results on system estimation and other tasks, one big downside is the tremendous amount of computational pow…
View article: Development of a Design-Driven Parametric Mass Timber Construction System for Modular High-Rise Urban Housing
Development of a Design-Driven Parametric Mass Timber Construction System for Modular High-Rise Urban Housing Open
This paper presents the outcome of an ongoing research and development process at Lang Wilson Practice and Architecture Culture and Intelligent City on a parametric mass timber construction system for modular mid- to high-rise urban housin…
View article: Removing the rose-colored glasses: Resetting U.S. - Turkey relations
Removing the rose-colored glasses: Resetting U.S. - Turkey relations Open
In the midst of a shifting global landscape, the U.S.-Turkey relationship is in a volatile state. Although historically allies, Turkey and the U.S. have begun to drift apart as a result of Turkey’s rising selfconfidence and willingness to …