
Peter Adam HoeherKiel University | CAU · Institute of Electrical and Information Engineering
Peter Adam Hoeher
Doctor of Engineering
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471
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Publications (471)
A novel technique is proposed for estimating the angle-of-arrival (AOA) in free-space laser communication based on the shape of a laser beam spot on a flat surface. Two methods are introduced: one where ellipses are fitted to the intensity contour of the beam spot, and another where a least-squares fit of an AOA-dependent two-dimensional Gaussian d...
Talkative Power Conversion (TPC), which embeds information in the switching ripple to achieve simultaneous power and data transmission without installing any or few additional hardware at the transmitter side, can reduce the additional communication infrastructure needed in cyber-physical systems like smart grids and renewable power plants. While i...
This paper presents a novel concept for joint light source identification and localization (JLIL) with subsequent interference suppression using a liquid crystal display (LCD)-based receiver. The JLIL concept is particularly suitable for multiple-input single-output visible-light-communication settings, where an LCD-based receiver must be able to i...
Current research focuses on radio frequency (RF) systems for autonomous driving and urban air mobility, sharing demands for utmost reliable communication and radar systems installed in confined spaces. As a result, co-existence considerations are becoming increasingly important. By dividing antenna groups into sub-groups and increasing their spacin...
This paper extends previous work on liquid-crystal-display-based angle-of-arrival (AoA) estimation, initially performed for only a single light source (LS), by considering scenarios with multiple LSs. First, the system model is revisited to investigate parameters that influence detection of multiple LSs. Next, challenges such as separation of co-lo...
Increasing airspace safety is an important challenge, both for unmanned aerial vehicles (UAVs) as well as manned aircraft. Future developments of collision avoidance systems are supposed to utilize information from multiple sensing systems. A compact sensing system could employ a multi-mode multi-port antenna (M 3PA). Their ability to radiate multi...
Talkative power conversion (TPC), which embeds information into the switching ripples of power converters to achieve the simultaneous transmission of power and data without the installation of additional hardware, can reduce the additional communication infrastructure in cyber–physical systems of digital energy and modern power plants. TPC in dc/dc...
This article presents a STEM learning platform focusing on renewable energy generation, energy storage, and simultaneous transmission of energy and data. These enabling technologies are classified already by teenagers as authentic, multidisciplinary, sustainable and future-oriented, which helps to stimulate their interest. Linking electric energy g...
Methods for calculating the impulse response of dispersive optical wireless channels have been known for a long time. However, a comprehensive procedure for predicting resulting bit error rates, starting from a highly accurate channel emulation method, has not yet been presented. To fill this gap, we propose a methodology for modeling realistic dis...
Two‐dimensional direction‐of‐arrival (DoA) estimation in azimuth and elevation via radar systems equipped with uniform rectangular arrays (URAs) will play an important role in various application areas—most distinctively in future urban air mobility settings with unmanned aerial vehicles. A key factor is the fast and reliable provision of target de...
The mobile autonomous underwater system (MAUS) aims to create next-generation vehicles, focusing on improved intelligence, mission operations, and application scenarios. Accordingly, two types of autonomous underwater vehicles (AUVs) have been developed to operate and collaborate in various applications. The first AUV, named “Hansel,” has hovering...
The anticipated trends in mobility, either autonomous driving or urban air mobility (UAM), require wireless services to achieve mandatory reliability and safety levels. The number of wireless systems already in-use, especially airborne, occupy regulated spectra. In order to mitigate the impact of a large number of systems mounted to airborne platfo...
To enable a safe and reliable operation in future urban air mobility scenarios with a large number of autonomous aerial vehicles, automatic sensing systems will be required during the starting and landing phase as well as through comparatively narrow air spaces typical for urban areas. This paper shows an implementation of a compressive sensing (CS...
p>This article presents a STEM learning platform focusing on renewable energy generation, energy storage, and simultaneous transmission of energy and data. These enabling technologies are classified already by teenagers as authentic, interdisciplinary, sustainable and future-oriented, which helps to stimulate interest of pupils and students. Linkin...
p>This article presents a STEM learning platform focusing on renewable energy generation, energy storage, and simultaneous transmission of energy and data. These enabling technologies are classified already by teenagers as authentic, interdisciplinary, sustainable and future-oriented, which helps to stimulate interest of pupils and students. Linkin...
Spatially distributed underwater sensor systems are important tools to understand long-term trends in marine ecosystems. For example, in the ongoing UFOTriNet project, noninvasive techniques for the purpose of monitoring fish populations are investigated. A challenge within this and related projects is the long-term operation of cameras in brackish...
Simultaneous power and data transmission is possible by data injection into control signals of power converters without additional hardware. In this paper, a modified analog hysteretic current control is discussed which combines data transmission with efficient quasi-square-wave zero-voltage switching. A half-bridge GaN converter with 99.1 investig...
An underwater optical wireless communication system concept based on optical phased array antennas is presented. With this optical phased array, a laser beam can be electronically steered to adjust not only the azimuth and elevation angles, but also the beamwidth. The proposed concept simplifies pointing and acquisition challenges between non-align...
Estimating the distance between the source of a diffusive process and a receiver has a variety of applications, ranging from gas source localization at the macro-scale to molecular communication at the micro-scale. Distance information can be extracted from features of the observed particle concentration, e.g. its peak. This paper derives the Cramé...
Due to technological advances in the field of radio technology and its availability, the number of interference signals in the radio spectrum is continuously increasing. Interference signals must be detected in a timely fashion, in order to maintain standards and keep emergency frequencies open. To this end, specialized (multi-channel) receivers ar...
An air-based macroscopic molecular communication (MC) testbed is presented exploiting the fluorescent properties of a highlighter-ink water-based solution. The testbed consists of a pressure sprayer as its transmitter, a 2 m long tube as the transmission channel, and a newly designed PIN-photodiode-based detector at the receiver side. The considere...
In this paper, we introduce compressive sensing (CS) to the concept of angle-of-arrival (AoA) estimation with a liquid crystal display (LCD). First, we demonstrate how the LCD based AoA estimation principle can be adapted to employ CS to this class of problem. We then describe the system model and derive the well-known CS equation. Subsequently, we...
Current trends regarding the next generation of mobile communications envision a convergence of the fields of communication and sensing. This is particularly true for mobile platforms offering rather confined installation spaces, e.g. in autonomous driving (AD) or future urban air mobility (UAM) applications. Communication systems recognize their e...
In many optical wireless communications systems, power efficiency is paramount. In others, flexibility is important. To achieve these goals, this paper presents a novel transmission scheme dubbed
asymmetrically clipped optical Hadamard coded modulation (ACO-HCM)
. ACO-HCM combines the characteristics of real-valued non-negative orthogonal frequen...
Power Line Communication (PLC) and Simultaneous Wireless Information and Power Transfer (SWIPT) are popular examples of applications, where power and information are transmitted simultaneously. In most cases, different devices have been used to generate the power and communication signals independently. Usually, the information is superimposed onto...
Joint communication and sensing (JCAS) is of special interest due to densification in various contexts like wireless networks, airspace, and transportation networks. In this paper, a JCAS approach using a single multi-mode multi-port antenna (MPA) element is proposed. Towards this goal, circular beamforming is applied in order to separate communica...
An air-based macroscopic molecular communication testbed exploiting fluorescence properties of water-based solutions of Uranine and Rhodamine 6G dyes is presented in this work. The testbed comprises of an industrial sprayer as its transmitter, a 2 m long tube as the transmission channel, and a high-speed camera-based detector. The considered transm...
We consider error-rate prediction for dual-use lighting systems with visible light communication (VLC) functionality. Since
light planning
rather than communications engineering is usually the driving discipline for practical dual-use settings, we extract VLC channel parameters as a by-product from advanced 3-dimensional (3D) light-planning model...
Improving safety is of general interest in aviation. Flight transponders used in collision avoidance systems advise pilots with information of potential collisions and avoidance resolutions. Some transponders are capable of transmitting the instantaneous position of the vehicle which might be turned off. To prevent autonomous flights from collision...
Although single-node leadless pacemakers eliminate several complications associated with subcutaneous pockets and leads, they have the significant limitation of only being able to perform single-chamber pacing. Multi-nodal pacing can outperform single-chamber pacing by providing a closer approximation of sinus rhythm but requires energy-efficient w...
In visible light communication systems, the ability to suppress interference caused by other light sources is a major benefit towards performance improvements. Especially for large transmitter arrays or even multi-cell arrangements, the interference problem needs to be handled. In previous work, we have presented a liquid crystal display (LCD) used...
Wireless intensity-modulated optical channels feature some very specific differences compared to wireless radio channels. These properties have a strong impact on the performance of digital modulation techniques. This paper discusses basics to consider when designing optical intensity modulation schemes. We introduce an error event probability expr...
With the upcoming trends in autonomous driving and urban air mobility, the number of self-navigating vehicles will increase, since they are foreseen for deliveries as well as autonomous taxis among other applications. To this end, a multitude of on-board systems for wireless communication, environment sensing, and localization will become mandatory...
Cooperative radio localization and navigation systems can be used in scenarios where the reception of global navigation satellite system (GNSS) signals is not possible or impaired. While the benefit of cooperation has been highlighted by many papers, calibration is not widely considered, but equally important in practice. Utilizing the signal propa...
In this paper, a novel concept for visible light positioning is introduced, which employs a liquid crystal display as a dynamic optical filter in front of a photodetector. By electronically switching dedicated pixel areas in transparent or blocking mode, respectively, the angle of arrival is estimated. The measurement principle is supported by a ma...
The DoA of radio waves is used for many applications, e.g. the localization of autonomous robots and smart vehicles. Estimating the DoA is possible with a multiport antenna, e.g. an antenna array or a multi-mode antenna (MMA). In practice, DoA estimation performance decisively depends on accurate knowledge of the antenna response, which makes anten...
Cooperative localization fills the gap in scenarios where global navigation satellite system (GNSS) reception is denied or impaired. Position and orientation information is then often provided based on signal round-trip time (RTT) and direction-of-arrival (DoA). Obtaining a meaningful RTT requires calibrated transceiver group delays, and accurate D...
Optical channel decorrelation is a key aspect in designing a multi-user visible light communication system. As light-emitting diodes (LEDs) are commonly used for illumination and data transmission in such a system simultaneously, the interference between them is a major problem for suitable modulation schemes. We have proposed to position liquid-cr...
Besides mimicking bio-chemical and multi-scale communication mechanisms, molecular communication forms a theoretical framework for virus infection processes. Towards this goal, aerosol and droplet transmission has recently been modeled as a multiuser scenario. In this letter, the “infection performance” is evaluated by means of a mutual information...
For the first time, the recently proposed "talkative power" paradigm combining power electronics and communication engineering is extended by channel coding and advanced receiver design aspects. In this concept, the pulses that control the duty cycle of switched-mode power converters are simultaneously used for data transmission by modifying the pu...
Magnetic communication is a promising technique in harsh environments, such as seawater. To enable efficient communication, transmitting and receiving coils are conventionally operated as part of resonant circuits. However, this results in narrow bandwidths and the associated disadvantages. Thus, most digital modulation schemes cannot be used effic...
Underwater swarm robotics is an emerging topic. Compared to individual autonomous vehicles, high-capacity communication links are required between the mobile agents. In this tutorial, suitable communication technologies are studied, with emphasis on LED-based underwater optical wireless communications. A comprehensive overview about challenges, adv...
Molecular communication is not only able to mimic biological and chemical communication mechanisms, but also provides a theoretical framework for viral infection processes. In this tutorial, aerosol and droplet transmission is modeled as a multiuser scenario with mobile nodes, related to broadcasting and relaying. In contrast to data communication...
This contribution exploits the duality between a viral infection process and macroscopic air-based molecular communication. Airborne aerosol and droplet transmission through human respiratory processes is modeled as an instance of a multiuser molecular communication scenario employing respiratory-event-driven molecular variable-concentration shift...
We address the problem of direction-of-arrival (DoA) estimation for air targets using a compact, multi-functional radar sensor. In order to enhance the angular resolution of such sensors while exploiting the sparseness of typical air scenarios, we consider the combination of a multiple-input multiple-output (MIMO) radar approach with suitable compr...
State-of-the-art radio localization methods often rely on estimating the signal direction-of-arrival (DoA) or direction-of-departure (DoD). This requires careful calibration of the antenna, including surrounding structure, in a measurement chamber. Alternatively, auto-calibration algorithms can be used for certain types of phased arrays. However, t...
A posteriori probability (APP) and max-log APP detection is widely used in soft-input soft-output detection. In contrast to bijective modulation schemes, there are important differences when applying these algorithms to non-bijective symbol constellations. In this letter the main differences are highlighted.
Besides mimicking bio-chemical and multi-scale communication mechanisms, molecular communication forms a theoretical framework for virus infection processes. Towards this goal, aerosol and droplet transmission has recently been modeled as a multiuser scenario. In this letter, the "infection performance" is evaluated by means of a mutual information...
An air-based macroscopic molecular communication testbed exploiting fluorescence properties of water-based solutions of Uranine and Rhodamine 6G is presented in this work. The testbed comprises of an industrial sprayer as its transmitter, a 2 m long tube as transmission channel, and a high-speed camera-based detector. The transmission distances con...
Joint communication and positioning based on a unified signal structure yields synergy and can complement and assist system designs enabling higher coverage and quality of service for both communication and positioning. For the time of arrival (TOA) based joint communication and positioning the TOA estimation accuracy is crucial. It is known to tra...
Molecular communication is not just able to mimic biological and chemical communication mechanisms, but also provides a theoretical framework regarding viral infection processes. In this tutorial, aerosol and droplet transmission is modeled as a multiuser scenario with mobile nodes, related to broadcasting and relaying. In contrast to data communic...
Semiconductor-based light emitting diodes can be used for photon emission as well as for detection of photons. In this paper, we present a fair comparison between off-the-shelf power Light emitting diodes (LEDs) and a silicon photodetector with respect to their spectral, temporal, and spatial properties. The examined LED series features unexpected...
This contribution exploits the duality between a viral infection process and macroscopic air-based molecular communication. Airborne aerosol and droplet transmission through the human respiratory processes is modeled as an instance of a multiuser molecular communication scenario employing respiratory-event-driven molecular (variable) concentration...
Both direction-of-arrival (DoA) and direction-of-departure (DoD) of a radio signal contain valuable information for localization. Their estimation with antenna arrays is well known. More recently, multi-mode antennas (MMAs), building on the theory of characteristic modes, have been investigated for DoA estimation. This paper introduces joint DoA an...
We present a method for VLC data transmission using a single LED and a driver with dimming support. AMI and RZ-OOK coding are applied as modulation schemes and experimental measurements in a testbed were performed.
A multitude of autonomous robotic platforms collectively organized as a swarm attracts increasing attention for remote sensing and exploration tasks. A navigation system is essential for the swarm to collectively localize itself as well as external sources. In this article, we propose a self-aware swarm navigation system that is conscious of the ca...
Multi-mode antennas have recently been studied for communication as well as localization purposes. In this work, the capabilities provided by a single planar multi-mode radiator as a steerable multi-port antenna are explored. As an original contribution, the radiation characteristics of individual groups of modes of the single radiator are combined...
While on one hand 5G and beyond 5G networks are challenged by ultra-high data rates in wideband applications like 100+ Gb/s wireless Internet access, on the other hand they are expected to support reliable low-latency Internet of Things applications with ultra-high connectivity. These conflicting challenges are addressed in a system proposal dealin...
In this paper, the displacement of the phase centers of multi-mode antennas is investigated. A mathematical approach is applied in order to calculate the positions of the phase center for each mode. Using electric far field samples obtained from electromagnetic field simulation data, the coordinates of the shifted positions of the phase center rela...