Jon Goya

Implementation and validation of an Angle of Arrival (AOA) determination system

This paper presents the implementation and validation of a complete AoA (Angle of Arrival) system. The AoA system is typically used together with smart antenna technology. In this paper the AoA system is part of a mobile wireless communication positioning system. The implementation includes the array antenna, the front ends and the AoA estimation block, which uses the MUSIC algorithm. Furthermore, a complete AoA system model has been developed, and used to find the optimum configuration of the AoA system. The AoA system has been validated using the model implemented in MATLAB.

On-Board Electromagnetic Interference Field-Test and Evaluation of a Non-electrified Railway Regional Line

In order to assess the performance of the wireless communication systems, a railway line is characterised through the identification of electromagnetic interferences (EMI). The aim of this paper is to show the strategy to identify EMI on field as well as the results obtained. First, the need of the analysis and the objectives of the measurement campaign in a non-electrified Italian Regional Railway line between Caligari and San Gavino are shown. After that, the measurement setup developed for the tests is described. Then, the description of the measurement campaign carried out is exposed. Finally, the measurement results are presented. The results show that the frequency bands of GSM, UMTS and Italian 4G are in the frequency ranges where the highest powered signal (around 800 MHz–900 MHz, 1.8 GHz and 1.9 GHz), on the other hand GPS L1 and Galileo E1frequency band is not impacted by any kind of interference signal.

Analysis of YouTube’s traffic adaptation to dynamic environments

The popular Internet service, YouTube, has adopted by default the HyperText Markup Language version 5 (HTML5). With this adoption, YouTube has moved to Dynamic Adaptive Streaming over HTTP (DASH) as Adaptive BitRate (ABR) video streaming technology. Furthermore, rate adaptation in DASH is solely receiver-driven. This issue motivates this work to make a deep analysis of YouTube’s particular DASH implementation. Firstly, this article provides a state of the art about DASH and adaptive streaming technology, and also YouTube traffic characterization related work. Secondly, this paper describes a new methodology and test-bed for YouTube’s DASH implementation traffic characterization and performance measurement. This methodology and test-bed do not make use of proxies and, moreover, they are able to cope with YouTube traffic redirections. Finally, a set of experimental results are provided, involving a dataset of 310 YouTube’s videos. The depicted results show a YouTube’s traffic pattern characterization and a discussion about allowed download bandwidth, YouTube’s consumed bitrate and quality of the video. Moreover, the obtained results are cross-validated with the analysis of HTTP requests performed by YouTube’s video player. The outcomes of this article are applicable in the field of Quality of Service (QoS) and Quality of Experience (QoE) management. This is valuable information for Internet Service Providers (ISPs), because QoS management based on assured download bandwidth can be used in order to provide a target end-user’s QoE when YouTube service is being consumed.

Technologies Evaluation for Freight Train’s Wireless Backbone

The current low modal share of intra-EU rail freight transport is partly due to limitations of operational and technical nature, which impact the overall capacity and performance of the sector. In order to overcome these issues, Shift2Rail set a specific Innovation Programme 5 (IP5) focused on Technologies for Sustainable & Attractive European Rail Freight. In this context, the FR8RAIL project, is working on the “Development of Functional Requirements for Sustainable and Attractive European Rail”. To overcome these limitations, among other technical areas, the communications of the freight train is involved. This paper deals with the analysis of the and mainly with the evaluation of the technologies currently available. This will lead to the definition of the future freight train communication as an outcome of FR8RAIL project that will positively contribute to and support the Shift2Rail goals to strengthen the role of the freight rail transport.

Survey of Environmental Effects in Railway Communications.

In order to identify the different external impairments that could exist in the railway environment. A survey of these effects is presented with the aim of identifying the different phenomena that could affect to the communication channel. On one hand, common effects linked to the signal transmission over a wireless communication channel are analysed. On the other hand, as GSM-R is the current communication technology employed in ERTMS, the disturbances interfering it have been studied. Finally, some solutions to mitigate these effects are listed, in this case, focused in handover solutions.

Virtual testing of the on-board ETCS with GNSS based Train integrity determination

This paper shows the strategy and results of the simulation of the Train integrity determination system into the on-board ETCS. It first shows the Smart Train Positioning System (STPS), a GNSS based on-board system that determines the the train integrity. Then, scenarios are derived for two different routes. After that, the test setup based on the ETCS on-board unit virtual laboratory is explained. Finally, the results show that the on-board ETCS equipment is able to detect correctly the integrity loss and operates accordingly. Then, the capability of STPS of providing integrity information is proven and that leads to the conclusion that trains integrity can be determined on-board by using STPS.

GNSS Complementary Positioning System performance in railway domain

An on-board Complementary Positioning System (CPS) has been proposed to overcome the limitation of GNSS positioning systems. This paper deals with the test phase of CPS to guarantee the localization functions in areas in which GNSS signals are not available. In order to analyze the suitability of CPS its performance in a railway operational line has been evaluated. The CPS is based mainly on GNSS, Inertial Measurement Units (IMU) and Wireless Communications Technologies (WCT) as input sources for localization. The field tests have been carried out in an operational regional line and availability has been increased as it was the purpose.