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Designing wireless industrial communication for factory automation is a serious task because novel radio systems have to compete with well established wired fieldbus solutions. The requirements to achieve equivalent reliability and latencies impose challenging demands on design and implementation. In this paper, we propose a hardware accelerator for highly adaptive and parallel medium access allowing...
Novel wireless systems are often first evaluated by simulation, before prototypes are tested and the concepts are standardized. In order to ensure relevant simulation results, the wireless channel has to be modelled properly and application oriented. Currently, only few considerable industrial channel models are available. The IEEE 802.15.4a model is the most commonly used. CM 7 applies for LOS modelling...
Ubiquitous wireless local networks which use channel transfer function estimation to compensate for echoes on the wireless channel are uniquely suited for motion detection as a secondary use. In this way, added value can be provided without additional hardware. This paper presents a procedure with uses channel state information of an IEEE 802.11 High Throughput wireless link to reliably detect the...
Communication in industrial applications like factory automation (FA) demands very low latency combined with high reliability. Since state of the art wireless technologies are not entirely fulfilling FA requirements, novel approaches are being developed.
Industry 4.0 is a subject of current relevance which targets detailed information acquisition from industrial production processes. Wireless communication to ease this acquisition process is highly interesting but suffers today from problems of low reliability, high latency and small flexibility. ParSec addresses these subjects by investigating an innovative, CDMA based approach with very low latency...
Many statistical wireless channel models for different standards and environments have been defined. However, a single stationary statistical model does not reproduce the long term characteristics of the wireless transmission channel sufficiently. When a wireless link is modeled over longer periods of time, changes of the environment must be considered. These changes can be characterized by different...
In this paper we propose to increase the precision of block matching motion estimation by introducing adaptive weights known from bilateral filtering into the SAD cost function. Estimation is carried out pixel-wise, such that a dense vector field is estimated of same resolution as the input images. A combination of hierarchical and spatio-temporally predictive estimation framework is used for processing...
In this paper we propose a post-processing method for block-matching based correspondence vector fields. We combine image adaptive filtering for object accurate vector field refinement with differential floating point precise optical flow estimation. More precisely, image warping and large cross-adaptive filter kernels are integrated into the Horn and Schunck optical flow estimation approach to break...
In this paper a receiver making use of a complexity-optimized Decision feedback equalization (DFE) structure and adaptive noise filtering is presented. Vehicular transmission systems such as IEEE 802.11p are facing serious challenges originating from the vehicular channel. Due to the channels high Doppler frequencies and long path delays, channel estimation and equalization is a pivotal aspect of...
Current home networks are often split up in high data rate networks for multimedia and internet applications and low data rate networks for home automation. This separation leads to inefficient and cumbersome network configurations. It also hinders the widespread use of home automation networks. The IPv6 adaptation for resource constrained devices can help to realize a common addressing scheme for...
The accommodation vergence conflict is one of the the main sources for visual fatigue caused by stereo 3d. Special care has to be taken during content production in order to maintain a high quality of experience. However, the common approaches of doing so are not always viable and might come with certain disadvantages as well. In this paper, we therefore propose and analyze a method, which solves...
Vehicular channels are among the most challenging wireless channels due to their high Doppler frequencies and multiple path delays. To meet these challenges, the IEEE standard 802.11p was developed. To improve performance, a vast variety of extended receiver concepts has been proposed and evaluated under different test conditions. In this paper, we study the two most promising standard-compliant receiver...
Current HD and 3D TV sets still have to cope with various input content resolutions that have to be displayed in native Full HD or higher resolution. Typical up-scaling methods only make use of spatial information in order to compute a high resolution output. Most of these methods show a low ability to reconstruct high frequency details. In this paper a method for reconstructing details from multiple...
Consumer electronic devices based on IEEE 802.11 are widely-used in home networks. Recent evolution of IEEE 802.11 mainly focused on increased data rates. Besides, the transmission of control information in smart home networks is gaining increasing importance with the emergence of the “Internet of Things”. This scenario demands robust and reliable transmission at low signal to noise ratio (SNR) while...
HDTV flat panel displays are now available in many living rooms. However, a huge amount of video is still in standard definition format or has even a lower resolution and may suffer from severe coding artifacts. Displaying all this video on panels with high resolution grids makes methods mandatory which can significantly improve the video quality. Iterative reconstruction algorithms can fulfil this...
In this paper we present the functionality of a holographic laser projector used to reproduce two-dimensional image sequences. First, we present real-time capable algorithms which are used for converting images into phase holograms. The phase holograms produce high quality reconstructions of the target images in ideal simulations. Secondly, we briefly describe the characteristics of a typical hold-type...
For ad-hoc home networks without central coordinator, IEEE 802.11 systems merely support service differentiation. In many usage scenarios of a typical home network with applications requiring a strict quality of service (QoS), this MAC functionality is not sufficient. In order to counteract this problem, we developed in previous works a modified MAC scheme based on the IEEE 802.11 enhanced distributed...
This paper addresses bit-interleaving for low-density parity-check (LDPC) coded modulation in AWGN and Rayleigh channels. We present an interleaving scheme that accounts for the different bit reliabilities inherent to higher-order modulation and the unequal error protection (UEP) properties of irregular LDPC codes. Therefore, we analyze the UEP properties and introduce a metric indicating the influence...
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