12 documents found, page 1 of 2
Outage Probability of V2V Multiple-Antenna Rice Fading Links with Explicit Grou...
Gutiérrez Gaitán, Miguel; Samano-Robles, Ramiro; Rodriguez, JonathanThis paper investigates the improvement in terms of outage probability of a vehicle-to-vehicle (V2V) communication link with respect to the density of antennas used at each vehicle end. The objective is to find a trade-off between system complexity and communication performance considering that the deterministic component of the link is affected explicitly by multiple ground reflections (self-interference). The...
Orthogonal Space-Time Block Coding for V2V LOS Links with Ground Reflections
Gaitán, Miguel Gutiérrez; Samano-Robles, RamiroThis work presents a capacity analysis of Space-Time Block Codes (STBC) for Vehicle-to-Vehicle (V2V) communication in Line-of-Sight (LOS). The aim is to assess how this type of coding performs when the V2V LOS channel is influenced by ground reflections. STBCs of various coding rates are evaluated using antenna elements distributed over the surface of two contiguous vehicles. A multi-ray tracing tool is used to...
Wireless Channel Prediction Using Artificial Intelligence with Constrained Data...
Javanmardi, Gowhar; Samano-Robles, RamiroThis work deals with the study of artificial intelligence (AI) tools for purposes of vehicular wireless channel prediction. The objective is to test the ability of different types of AI and machine learning (ML) algorithms under different types of implementation constraints. We focus particularly in highly changing scenarios where the channel state information changes relatively fast and therefore the relevant ...
The DEWI High-Level Architecture: Wireless Sensor Networks in Industrial Applic...
Samano-Robles, Ramiro; Nordström, Tomas; Kunert, Kristina; Santonja, Salvador; Himanka, Mikko; Liuska, Markus; Karner, Michael; Tovar, EduardoThis paper presents the High-Level Architecture (HLA) of the research project DEWI (Dependable Embedded Wireless Infrastructure). The objective of this HLA is to serve as a reference for the development of industrial Wireless Sensor and Actuator Networks (WSANs) based on the concept of the DEWI Bubble. The DEWI Bubble is a concept that can be used to integrate legacy industrial sensor networks with a modern, in...
A Space-Time Correlation Model for MRC Receivers in Rayleigh Fading Channels
Samano-Robles, RamiroThis paper presents a statistical model for maximum ratio combining (MRC) receivers in Rayleigh fading channels enabled with a temporal combining process. This means that the receiver effectively combines spatial and temporal branch components. Therefore, the signals that will be processed by the MRC receiver are collected not only across different antennas (space), \mbox{but also} at different instants of time...
A Multi-Ray Analysis of LOS V2V Links for Multiple Antennas with Ground Reflection
Farzamiyan, Amir Hossein; Gutiérrez Gaitán, Miguel; Samano-Robles, RamiroThis paper presents a vehicle-to-vehicle (V2V) geometric multi-ray tracing model for an improved line-of-sight (LOS) estimation. The model is especially suited for distributed antenna transceivers in the presence of ground reflections. The multiple antennas are assumed to be spaced regularly in horizontal and vertical directions over contiguous vehicles. The main focus of our study is the ability of the multipl...
Ultra-Reliable Low Latency based on Retransmission and Spatial Diversity in slo...
Samano-Robles, RamiroThis paper presents the analysis of the statistics of latency and information theoretic capacity of an adaptive link with retransmission-spatial diversity in a scenario with co-channel interference. The paper focuses specifically on the delay of the wireless transmission component, measured from the instant a packet at the head of the queue is first transmitted until it is correctly received by the destination ...
On the central Chi-square distribution with even degrees of freedom and correla...
Samano-Robles, RamiroThis paper presents the derivation new expressions for the statistics of a Chi-square distribution with $n$ degrees of freedom and where n is an even number. The complex Gaussian components of the chi-square distribution are modelled with a linear correlated model using different statistics (multi-rate) for each component. We focus on the specific expressions for the probability density function (PDF) and compl...
Performance Analysis of Network Diversity Multiple Access with Sequential Termi...
Samano-Robles, RamiroThis paper presents a new approach for terminal presence detection in the family of algorithms called network diversity multiple access (NDMA). The new scheme is based on non-orthogonal sequences. In NDMA, system-induced retransmissions are used to resolve the conflicts between colliding terminals. The key initial aspect in NDMA is to use signal processing tools to identify the size of the collision, as well as...
Network Diversity Multiple Access with Imperfect Channel State Information at t...
Samano-Robles, RamiroNetwork diversity multiple access (NDMA) is the family of algorithms with the highest potential throughput in the literature of signal-processing assisted random access protocols. NDMA uses the concept of protocol-induced retransmissions to create an adaptive source of diversity. This diversity is used to resolve packet collisions employing signal separation tools without the explicit need (or as a complement) ...