La evolución en los últimos años de las Tecnologías de la Información y de las Comunicaciones ha venido marcada por el aumento en la demanda tanto del ancho de banda como de la calidad en los servicios al usuario. En este sentido, han surgido nuevas técnicas de modulación digital de elevada eficiencia espectral como OFDM (Orthogonal Frequency...
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January 29, 2018 (v1)PublicationUploaded on: March 27, 2023
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September 8, 2021 (v1)Publication
In this paper we propose a transmission scheme for Coherent Optical Orthogonal Frequency Division Multiplexing (CO-OFDM) systems with Multiple Input - Multiple Output (MIMO) processing. Our proposal consists of the concatenation of two techniques, Non-Uniform Constellations (NUC) in the mapper, and Spatial Multiplexing (SM) in the...
Uploaded on: March 25, 2023 -
February 4, 2024 (v1)Publication
An enhanced ultrasonic communication system based on piezoelectric transducers for monitoring of goods in cargo containers is presented. The proposed system consists of several sensors placed inside the container, whose data are collected and transmitted outside it. Data transmission is carried out by an ultrasonic communication channel, in...
Uploaded on: February 6, 2024 -
November 30, 2023 (v1)Publication
Método de decodificación de constelaciones rotadas, como por ejemplo el implementado en el estándar DVB - T2, en donde para cada bit bi deben calcularse las métricas LLR a partir del punto de la constelación recibido (Ix,Qx) y siendo x un punto ideal de la constelación rotada con coordenadas en el plano complejo, donde este decodificador reduce...
Uploaded on: December 3, 2023 -
May 6, 2021 (v1)Publication
The constellation rotation and cyclic quadrature component delay (RQD) technique has been adopted in the second generation terrestrial digital video broadcasting (DVB-T2) standard. It improves the system performance under severe propagation conditions, but introduces serious complexity problems in the hardware implementation of the detection...
Uploaded on: March 25, 2023