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arXiv 2025年

作者： Soleymani, Mohammad Jorswieck, Eduard Schober, Robert Hanzo, Lajos Signal & System Theory Group Universität Paderborn Germany Institute for Communications Technology Technische Universität Braunschweig Braunschweig38106 Germany Institute for Digital Communications Friedrich Alexander University of Erlangen-Nuremberg Erlangen91058 Germany Department of Electronics and Computer Science University of Southampton Southampton United Kingdom

An efficient framework is conceived for fractional matrix programming (FMP) optimization problems (OPs) namely for minimization and maximization. In each generic OP, either the objective or the constraints are functions of multiple arbitrary continuous-domain fractional functions (FFs). This ensures the framework’s versatility, enabling it to solve a broader range of OPs than classical FMP solvers, like Dinkelbach-based algorithms. Specifically, the generalized Dinkelbach algorithm can only solve multiple-ratio FMP problems. By contrast, our framework solves OPs associated with a sum or product of multiple FFs as the objective or constraint functions. Additionally, our framework provides a single-loop solution, while most FMP solvers require twin-loop algorithms. Many popular performance metrics of wireless communications are FFs. For instance, latency has a fractional structure, and minimizing the sum delay leads to an FMP problem. Moreover, the mean square error (MSE) and energy efficiency (EE) metrics have fractional structures. Thus, optimizing EE-related metrics such as the sum or geometric mean of EEs and enhancing the metrics related to spectral-versus-energy-efficiency tradeoff yield FMP problems. Furthermore, both the signal-to-interference-plus-noise ratio and the channel dispersion are FFs. In this paper, we also develop resource allocation schemes for multi-user multiple-input multiple-output (MU-MIMO) systems, using finite block length (FBL) coding, demonstrating attractive practical applications of FMP by optimizing the aforementioned metrics. Copyright © 2025, The Authors. All rights reserved.

关键词： Mean square error

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Instrumental evaluation of in-car communication systems 11

Instrumental evaluation of in-car communication systems

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11th ITG Symposium on Speech Communication

作者： Theiß, Anne Schmidt, Gerhard Withopf, Jochen Lüke, Christian Department of Digital Signal Processing and System Theory CAU Kiel Germany

ISBN: (纸本)9783800736409

The aim of an in-car communication system is to improve the communication inside a vehicle. This communication is impaired, due to the high background noise occurring at higher velocities and can be improved by recording, processing, and playing back the speech signal of the talking passenger using loudspeakers. Due to this closed electroacoustic loop further issues arise, requiring more sophisticated algorithms, e.g., feedback control. After the development of an ICC system, the quality of the system is of great interest. Not only to analyze and to improve a single ICC system an evaluation is beneficial, but also to compare different ones. However, the term communication quality is not easy to fit into one instrumental measure, since quality depends on a variety of criteria. This contribution gives some first instrumental measures classifying the quality of an ICC system and a first approach to combine these to obtain an overall evaluation strategy. © VDE VERLAG GMBH Berlin Offenbach.

关键词： Quality control

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signal processing for microphone arrays on seat belts

Signal processing for microphone arrays on seat belts

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6th Biennial Workshop on digital signal processing for In-Vehicle systems and Safety 2013, DSP 2013

作者： Rajan, Vasudev Kandade Rohde, Sebastian Schmidt, Gerhard Withopf, Jochen Digital Signal Processing and System Theory Kiel University Germany

Microphones placed on the seat belts of an automobile (in the following shortly called beltmics) are an interesting alternative compared to other sensor positions. Because of the small distance to the talker's mouth, usually a good signal quality (e.g. measured in terms of high signal-tonoise ratio) can be achieved. However, the signals may also be disturbed because beltmics can easily be touched by, e.g., clothes and they might be in the air stream of automotive ventilation systems. In addition, applying array processing techniques is difficult because the geometry is flexible and may change over time. This paper presents signal enhancement algorithms designed for beltmics including echo cancellation, estimation of instationary noise, and microphone combining techniques. Results based on a real-time implementation are shown.

关键词： Beamforming

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Improvement by adding video feature in an acoustic ambiance simulation for automobiles 7

Improvement by adding video feature in an acoustic ambiance ...

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7th Biennial Workshop on digital signal processing for In-Vehicle systems and Safety 2015

作者： Warhadpande, Alankar Luke, Christian Theiß, Anne Schmidt, Gerhard Digital Signal Processing and System Theory University of Kiel Germany

ISBN: (纸本)9781510827844

In this paper we demonstrate how the combination of acoustical and visual stimuli can be introduced in an ambiance simulation for automobiles. The synchronization of the audio and the video is very important and is discussed in this paper. Furthermore, a subjective evaluation was performed which proved that the combined presentation of acoustical and visual stimuli is more effective than a separate presentation of audio or video. Ten participants were shown seventeen different scenarios. At the time of the evaluation some questions were asked to measure how realistic the ambiance is. Most of the participants felt that the combined audiovisual ambiance simulation is most effective. This result also shows that the audio-visual simulation has a significant effect for creating a realistic ambiance for automobiles.

关键词： Virtual reality

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Mixed Analog-digital Speech Communication for Underwater Applications 14

Mixed Analog-digital Speech Communication for Underwater App...

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14th ITG Conference on Speech Communication

作者： Wisch, Tim Owe Schmidt, Gerhard Digital Signal Processing and System Theory CAU Kiel Kiel Germany

ISBN: (纸本)9783800756285

In some cases, a speech communication link is necessary in underwater environments. While in terms of data communication advanced techniques are investigated and employed, mostly traditional (analog) forms of speech transmission are used for speech communication (at least in commercial products). In this contribution we present a mixed analog-digital approach, that tackles this problem by combining digital and analog approaches. Both transmission paths rely on each other in order to lower the necessary bitrate for the digital part and enhance the signal properties of the analog part. The proposed transmission scheme uses linear predictive coding (LPC) filtering combined with a codebook to whiten the input speech. Afterwards, the resulting signal is power normalized and transmitted in the analog transmission part and the quantized normalization factor is transmitted together with the codebook index in the digital transmission part. This leads to an analog transmission signal which is strongly reduced in dynamics. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Speech communication

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Impact of a Speaker Head Rotation on the Far-end Listening Situation 14

Impact of a Speaker Head Rotation on the Far-end Listening S...

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14th ITG Conference on Speech Communication

作者： Hübschen, Tobias Al-Mafrachi, Rasool Schmidt, Gerhard Digital Signal Processing and System Theory Kiel University Kiel Germany

ISBN: (纸本)9783800756285

Speech communication and dialog systems inside vehicles are usually optimized for a speaker in the driver’s seat who is permanently facing forward. However while driving, a speaker does repeatedly rotate his head left and right, which changes the properties of the signal picked up by the microphone. This work analyzes to what extent such a speaker head rotation impacts the signal in terms of frequency content, listening quality, and listening effort. By presenting a simple method for compensating the rotation effects and by combining this method with noise reduction and band limitation of the signals, an analysis of the far-end listening situation with and without speaker head rotation compensation is achieved. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Speech communication

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A real-time cognitive-sonar system for diver detection

A real-time cognitive-sonar system for diver detection

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MTS/IEEE Washington, OCEANS 2015

作者： Claussen, Tim Nguyen, Viet Duc Heute, Ulrich Schmidt, Gerhard Digital Signal Processing and System Theory University of Kiel Kiel Germany

ISBN: (纸本)9780933957435

Cognitive signal processing has been intensively studied over the past years. Nevertheless, cognitive sonar systems only draw little attention in the research community. In this paper the signal processing of a cognitive sonar system for diver detection is shown in detail. It is inspired by the target-detection system of a bat and thus able to adapt its signal processing units to measured parameters of particular targets. This is done by adjusting the transmitted signal as well as the direction of the transmitted energy of the active sonar system by transmit beamforming. Thereby, it is possible to improve on the one hand the probability of detection of a target for a given signal-to-noise ratio (SNR) as well as signal-to-reverberation ratio (SRR) and, on the other hand, to extend the spatial awareness by adapting the transmit beamformer. This technique leads to a combination of two spatial filters: The receive beampattern and the transmit beampattern. To obtain target-specific parameters, the data form an internal tracking system is used. After showing a general system overview, the core parts of the signal processing are shown in detail. At this point we focus on the Doppler processing with its real-time interpolation and correlation algorithms. Monte-Carlo simulations illustrate the potential of the proposed system by comparing the results with conventional active-sonar signal processing. © 2015 MTS.

关键词： signal to noise ratio

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Improvement in listener comfort through noise shaping using a modified wiener filter approach 11

Improvement in listener comfort through noise shaping using ...

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11th ITG Symposium on Speech Communication

作者： Rajan, Vasudev Kandade Baasch, Christin Krini, Mohamed Schmidt, Gerhard Department of Digital Signal Processing and System Theory Kiel University Germany Paragon AG Delbrueck Germany

ISBN: (纸本)9783800736409

The Wiener filter approach to noise suppression is well known both theoretically and practically. This paper explains the idea of extending this filtering approach to shape the residual noise of the output signal. Motivated by different kinds of stationary and instationary noise sources that appear in an automobile, along with the necessity to address the problem of increasing the listener comfort, an algorithm to achieve a time-frequency varying attenuation in the lower frequencies has been developed. The basic theory and the conditions to achieve this are presented. Details of the developed compressor algorithm as well as the modifications necessary to apply it to the classical Wiener filter are shown. The improvement that the modified filter brings to the noise input signal are significant and analyses of the results clearly show a reduction of the "ruggedness" of the input signal. © VDE VERLAG GMBH Berlin Offenbach.

关键词： Bandpass filters

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Feature extraction of modulated marine-mammal sounds for species classification

Feature extraction of modulated marine-mammal sounds for spe...

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11th European Conference on Underwater Acoustics 2012, ECUA 2012

作者： Kreimeyer, Roman Digital Signal Processing and System Theory Christian-Albrechts Universität Kiel Germany

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Simulation of automotive radar target lists considering clutter and limited resolution

Simulation of automotive radar target lists considering clut...

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International Radar Symposium 2007, IRS 2007

作者： Bühren, Markus Yang, Bin Department of System Theory and Signal Processing University of Stuttgart Germany

In the field of automotive radar signal processing, often real data is used from the beginning in the development of algorithms, even if simulated data offers several advantages, for example providing an exact reference and allowing to reduce the number of measurement campaigns. However, a radar simulation, for example based on a ray-tracing model, is very complex to implement and needs extremely large computational resources. In [1]-[3], we have introduced a simulation model for automotive radar target lists that is able to run in real-time on an up-to-date personal computer. The simulation imitates the 24 GHz near-range Pulse-Doppler radar sensor as described in [4], but can be adjusted to other sensors with similar resolution capabilities. In this paper, we present two extensions to the existing model. The first extension improves the simulation of the sensor's resolution capabilities in situations where two targets at the same distance and Doppler velocity melt into a single phantom target. The second new module considers the radar clutter before the sensorinternal tracking.

关键词： Clutter (information theory)

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