A5066589077- Advanced Wireless Communication Techniques
- Underwater Vehicles and Communication Systems
- Wireless Communication Networks Research
- Water Quality Monitoring Technologies
- Underwater Acoustics Research
- Marine animal studies overview
- Advanced MIMO Systems Optimization
- Indoor and Outdoor Localization Technologies
- Error Correcting Code Techniques
- Target Tracking and Data Fusion in Sensor Networks
- Robotic Path Planning Algorithms
- PAPR reduction in OFDM
- Robotics and Sensor-Based Localization
- Radio Wave Propagation Studies
- Energy Harvesting in Wireless Networks
- Adaptive optics and wavefront sensing
- Identification and Quantification in Food
- Advanced Adaptive Filtering Techniques
- Wireless Communication Security Techniques
- Full-Duplex Wireless Communications
- Power Line Communications and Noise
- Advancements in Photolithography Techniques
- Power Systems and Technologies
- Optical Network Technologies
- Remote-Sensing Image Classification
Fachhochschule Kiel
2011-2025
Kiel University
2004-2025
Fraunhofer Institute for Integrated Circuits
2004
Co-channel interference cancellation is particularly challenging in the downlink of cellular radio systems because usually only one receive antenna available at mobile terminal. This tutorial provides an overview promising a single-antenna co-channel techniques. Focus on time-division multiple access systems. The results may, however, be extended to related applications, including suppression multiple-input multiple-output
In this work, a low-cost low-power navigation solution for autonomous underwater vehicles is introduced utilizing Micro-Electro-Mechanical System (MEMS) inertial sensor and an ultra short baseline (USBL) system. The complete signal processing implemented on cheap 16-bit fixed-point arithmetic microcontroller. For data fusion calibration, error state Kalman filter in square root form used, which preserves stability case of rounding errors. To further reduce the influence errors, stochastic...
Traditionally, fish stock assessment is a time-consuming, expensive, and invasive task, since are caught counted using research vessels. Therefore, in joint project non-invasive, acoustic-optical Underwater Fish Observatory (UFO) proposed developed. The UFO counts classifies utilizing stereo camera system sonar order to observe the available biomass. In this paper, we first give an overview of whole system. Afterwards, focus on acoustic part system, which utilizes imaging detect, track,...
Fish stocks are among the most endangered components of marine ecosystems. To minimize threats to ecosystems and ensure natural sustainable resource use, monitoring systems must be placed in oceans seas. The Underwater Observatory (UFO) UFOTriNet two projects initiated by several researchers from biology, engineering industry Germany between years 2014 2016 2019 2023, respectively. collect abiotic as well camera sonar data count fish stocks. This work proposes a method for robust counting...
Today research interests in underwater (UW) communication and navigation technologies are steadily growing. However, the design of robust UW systems demands a deep knowledge transmission medium. Acoustic (AUW) is widely used due to good propagation characteristics sound waves water compared electromagnetic that highly attenuated. Besides its advantage - low attenuation AUW suffers from multipath propagation, severe Doppler spread speed sound, shadow zones, name some most challenging effects....
The growing demand on high speed data transmission as well the bandwidth limitation of microwave (RF) has stimulated development free-space optical (FSO) laser communication links during last years. Making reliable is one challenging problems that have to be solved establish a system suitable for commercial usage. Optical highly impacted by different channel conditions, leading from signal damping turbulence effects due atmosphere. In this paper hybrid RF/FSO maritime investigated. link...
In this letter, single antenna co-channel interference cancellation for cellular time-division multiple access (TDMA) networks by means of joint delayed-decision feedback sequence estimation is studied. The performance increased a novel adaptive state allocation technique.
A convolutionally coded M-ary frequency shift keying (MFSK) modulation scheme for underwater acoustic communication is introduced. It uses a rate 1/log <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> M inner convolutional code, whose symbols are used as transmission symbols. An interleaver in the domain applied to improve average channel clearing time. thereby achieves almost same data comparable uncoded hopped (FH-FSK) scheme, but...
In this paper, a receiver structure suitable for single-antenna cochannel interference cancellation in cellular TDMA networks is studied. The under investigation consists of novel linear prefilter followed by nonlinear detector. task the to suppress non-Gaussian and - simultaneously shorten overall impulse response, whereas detector cancel intersymbol interference. designed according principle minimum mean square error estimation, without solving an eigenvalue problem. Optionally can be...
Acoustic communication is the most common technique to communicate with an autonomous underwater vehicle (AUV) during its mission. Furthermore, this channel often used for ranging, support navigation of and localize it in world coordinates, whereas vehicles dead reckoning only gives a relative position starting point. Due severe multipath propagation under water, frequency hopped shift keying (FH-FSK) over long ranges, can be otherwise deemed bandwidth inefficient. In work, version FH-FSK...
In this paper, the impact of speed sound uncertainties on ray-tracing based acoustic underwater positioning is investigated. Therefore, model-based approach recently proposed by authors in [1] simplified ranging. Based new method different values distance estimate studied. Furthermore, we analyze effect recording a few measured profile (SSP) ranging accuracy using approach. Altogether, it can be concluded that resolution SSP has significant influence estimation. A challenging nonlinearity...
Detecting fish in submarine environment is a challenge due to the properties of water such as light absorption and scattering. In this work, we present method for preprocessing images environment. first step, model underwater overlapp two processes. The process considered Poisson distribution, while second one Gaussian mixture. resulting distribution called Poisson-Gaussian mixture (PGM). To estimate noise parameters, propose an iterative algorithm based on expectation maximization approach....
A new approach for acoustic localization of a fixed subsea transponder using surface vessel equipped with transceiver and global positioning system (GPS) based on modified Hough transform (MHT) is presented. The MHT developed in this work used to determine the latitude longitude coordinates utilizing range GPS data gathered by while traveling particular route. Various survey scenarios single seabed have been simulated studied considering both, accurate inaccurate ranging, as well realistic...
Sparse intersymbol-interference (ISI) channels are encountered in a variety of high-data-rate communication systems. Such have large channel memory length, but only small number significant coefficients. In this paper, trellis-based equalization sparse ISI is revisited. Due to the complexity maximum-likelihood detection, e.g., by means Viterbi algorithm (VA), normally prohibitive. first part unified framework based on factor graphs presented for reduction without loss optimality. new...
Single antenna co-channel interference cancellation for cellular TDMA networks by means of joint delayed-decision feedback sequence estimation is proposed. The performance can be increased a novel adaptive state allocation technique.
This paper presents a novel approach to state estimation based on particle filter dealing with measurement data effected by non-Gaussian, multimodal noise. The implementation focusses autonomous underwater vehicles (AUVs) utilizing of magnetic compass and mechanical scanning sonar for spatial navigation. Nowadays, approaches often require complicated feature extraction methods culminating in semantic interpretation the data. is not suitable low-cost low-weight AUVs, because these steps high...
In 3GPP GERAN, the performance specification of dual-antenna interference suppression techniques will be a subject downlink advanced receiver (DARP) phase II work item. this study, we apply filter-based single antenna technique for GSM 8PSK modulation assuming terminal is equipped with two antennas. We evaluate using correlation-based spatial channel model and show potential suppressing co-channel even high correlation factors. Besides, improvement can observed if angles factors desired user...
In this paper, fast techniques for computing the coefficients of a Kalman-based prefilter originally developed by Mulgrew are proposed. This approximates minimum-phase overall impulse response. conjunction with reduced-complexity equalizer, near optimum performance compared to maximum-likelihood sequence estimation is demonstrated wireless channels. We suggest an exact recursive solution as well new iterative solution. both solutions, computational complexity calculating O(L/sub WMF/)...
This study presents a trilateral test array of new opto-acoustic Underwater Fish Observatories (UFOs) that were operated and tested in Kiel Bight as part the “UFOTriNet” project. While hydroacoustic optical techniques have so far been used individually to observe monitor fish stocks, we present coupled hybrid system consisting an device intended scan near-field subsample spatially larger medium-to-far-field, scanned by acoustical device. The consists two residual light amplifying camera...
Sparse intersymbol-interference (ISI) channels are encountered in a variety of communication systems, especially high-data-rate systems. These have large memory length, but only small number significant channel coefficients. In this paper, equalization sparse ISI is revisited with focus on trellis-based techniques. Due to the complexity maximum-likelihood sequence estimation by means Viterbi algorithm normally prohibitive. first part unified framework based factor graphs presented for...
In this paper, a novel design of receiver-side FIR prefilter is proposed which able to jointly shorten the impulse responses multiple co-channels given just one receive antenna. The coefficients are computed without explicitly solving an eigenvalue problem. conjunction with reduced-complexity multiuser detector, good error performance can be achieved. As possible application, co-channel interference cancellation for EDGE system studied. prefilter, however, also suitable suppression in MIMO...