Improving THz Quality-of-Transmission with Systematic RLNC and Auxiliary Channels

In this paper, we propose a novel solution that can improve the quality of THz transmission with systematic random linear network coding (sRLNC) and a low-bitrate auxiliary channel. To minimize complexity of channel coding, we complement a generic low complexity FEC code by a low complexity sRLNC. To increase the overall throughput of THz transmission, we propose to send the native data and coding redundancy in parallel over 2 differently configured THz channels, i.e., over 1 high bit rate main channel and 1 low bit rate low error rate auxiliary channel. The results show, that the main THz channel supported by low bit rate auxiliary channel can use a higher level modulation format and sent over longer distances with a higher throughput.Comment: 7 pages, 6 figures, accepted at IEEE ICC'20 Workshop - TeraCo

Endogenous Cerberus activity is required for anterior head specification in Xenopus

We analyzed the endogenous requirement for Cerberus in Xenopus head development. 'Knockdown' of Cerberus function by antisense morpholino oligonucleotides did not impair head formation in the embryo. In contrast, targeted increase of BMP, Nodal and Wnt signaling in the anterior dorsal-endoderm (ADE) resulted in synergistic loss of anterior head structures, without affecting more posterior axial ones. Remarkably, those head phenotypes were aggravated by simultaneous depletion of Cerberus. These experiments demonstrated for the first time that endogenous Cerberus protein can inhibit BMP, Nodal and Wnt factors in vivo. Conjugates of dorsal ectoderm (DE) and ADE explants in which Cerberus function was 'knocked down' revealed the requirement of Cerberus in the ADE for the proper induction of anterior neural markers and repression of more posterior ones. This data supports the view that Cerberus function is required in the leading edge of the ADE for correct induction and patterning of the neuroectoderm.info:eu-repo/semantics/publishedVersio

Propagation models for high sites in urban areas

Analyses of results from commonly used propagation models applied to UMTS Ultra High Sites in urban environments are presented. Differences between predicted and measured values for a site in Nuernberg are calculated as a function of the distance between base station and mobile station and as a function of the angle of incidence. An assessment of the validity range of the different propagation models is done. Furthermore, an analysis of the accuracy of the classification of building data is presented

Simulation of GPS localisation based on ray tracing

In recent years, many simulation tools emerged to model the communication of connected vehicles. Thereby, the focus was put on channel modelling, applications or protocols while the localisation due to satellite navigation systems was treated as perfect. The effect of inaccurate positioning, however, was neglected so far. This paper presents an approach to extend an existing simulation framework for radio networks to estimate the localisation accuracy by navigation systems like GPS, GLONASS or Galileo. Therefore the error due multipath components is calculated by ray optical path loss predictions (ray tracing) considering 3D building data together with a well-established model for the ionospheric error

Link-Level-Simulationen der Bitübertragungsschicht für Kommunikationssysteme im niedrigen THz-Bereich: Validierung und Analyse eines Anwendungsfalls in einem Rechenzentrum

Dieser Datensatz beinhaltet die Simulationsergebnisse der Link-Level-Simulationen der Bitübertragungsschicht eines Kommunikationssystems im niedrigen THz-Bereich. Der Simulator wird über Referenezsimulationen über einen Kanal mit additivem weißen gaußschen Rauschen für verscheidene Modulations- und Codierverfahren validiert. Anschließend wird ein Szenario in einem mit drahtlosen Verbindungen erweiterten Rechenzentrum analysiert. Dafür werden Impulsantworten über strahlenoptische Pfadprädiktionen und die Bitfehlerrate für verschiedene Parameterkonstellationen aus Modulations- und Codierverfahren, Sendepuls und den Bauteileinflüssen der Hochfrequenzbauteile zu Verfügung gestellt.This data set contains the simulation data of link level simulation of the physical layer of a communication system operating at low THz frequencies. First, a validation of the link level simulatior was performed via an additive white gaussian noise channel with different modulation and coding schemes. Then, the simulator was applied to a data center use case examining the performance of wireless top-of-rack links in a wirelessly augmented data center. Here, impulse responses simulated via ray tracing are provided. Finally, the bit error rate is examined for different modulation and coding schemes, waveforms, and the effect of specific impairments of radio frequency devices