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

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

Tri-Band Mm-wave Directional Channel Measurements in Indoor Environment

A measurement campaign has been carried out in a reference indoor environment - a medium-size meeting room - using an ultra-wideband channel sounder operating at 3 different frequency bands: 10 GHz, 60 GHz and 300 GHz. Automatic rotational units are used at Tx and Rx side to perform a full horizontal scanning with directional antennas, in order to achieve a doubledirectional channel characterization. Preliminary results show that multipath is mainly affected by few single or double-bounce components, and significant contributions may come from objects other than the walls, e.g. TV monitor and entrance door. Most of the contributions are clearly identifiable at all the considered frequencies, although they appear to be stronger at 60 GHz compared to 10 GHz. The radio channel's multipath richness appears to be frequency dependent, and in particular it decreases when comparing 60 GHz to 300 GHz

Demonstrator for objective driven SON operation

The demonstrator shows a self-management system for heterogeneous mobile wireless networks that uses context-specific and weighted Key Performance Indicator (KPI) target values defined by the operator to automatically and autonomously configure and control the operation of Self-Organising Network (SON) functions such that they contribute to achieving these KPI targets by appropriately optimising the network configuration. Changing KPI targets, context or weights leads to an automatic re-configuration of the SON functions by using a policy system, and the impact of the changes to the policy and the network configuration can be seen and traced in the demonstrator's realistic network scenario and KPI charts

Policy-based SON management demonstrator

A Self-Organising Network (SON) represents an approach where the optimisation of a mobile radio network is automated through a set of independently operating SON functions. These SON functions, however, require to be configured in order to allow for an optimised network performance with respect to technical objectives defined by the network operator. The SEMAFOUR demonstrator shows a concept for SON management based on operator objectives, where the SON function configuration is performed in an automated way. The demonstrator illustrates the different aspects and complexity of the management of SON in a heterogeneous network. © 2015 IEEE