7 research outputs found

    Error Correction with Systematic RLNC in Multi-Channel THz Communication Systems

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    The terahertz (THz) frequency band (0.3-10THz) has the advantage of large available bandwidth and is a candidate to satisfy the ever increasing mobile traffic in wireless communications. However, the THz channels are often absorbed by molecules in the atmosphere, which can decrease the signal quality resulting in high bit error rate of received data. In this paper, we study the usage of systematic random linear network coding (sRLNC) for error correction in generic THz systems with with 2N parallel channels, whereby N main high-bitrate channels are used in parallel with N auxiliary channels with lower bit rate. The idea behind this approach is to use coded low-bit rate channels to carry redundant information from high-bit rate channels, and thus compensate for errors in THz transmission. The analytical results evaluate and compare the different scenarios of the THz system in term of the amount of coding redundancy, a code rate, transmission rate of auxiliary channels, the number of THz channels, the modulation format and transmission distance as required system configurations for a fault tolerant THz transmission.Comment: 6 pages, 5 figure

    Performance Analysis of MDPC and RS codes in Two-channel THz Communication Systems

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    We analyze whether a multidimensional parity check (MDPC) or a Reed-Solomon (RS) code in combination with an auxiliary channel can improve the throughput and extend the THz transmission distance. While channel quality is addressed by various coding approaches, and an effective THz system configuration is enabled by other approaches with additional channels, their combination is new with the potential for significant improvements in quality of the data transmission. Our specific solution is designed to correct data bits at the physical layer by using a low complexity erasure code (MDPC or RS), whereby original and parity data are transferred over two separate and parallel THz channels, including one main channel and one additional channel. The results are theoretically analyzed to see that our new solution can improve throughput, support higher modulation levels and transfer data over the longer distances with THz communications.Comment: This paper is uploaded here for research community, thus it is for non-commercial purpose

    Toward End-to-End, Full-Stack 6G Terahertz Networks

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    Recent evolutions in semiconductors have brought the terahertz band in the spotlight as an enabler for terabit-per-second communications in 6G networks. Most of the research so far, however, has focused on understanding the physics of terahertz devices, circuitry and propagation, and on studying physical layer solutions. However, integrating this technology in complex mobile networks requires a proper design of the full communication stack, to address link- and system-level challenges related to network setup, management, coordination, energy efficiency, and end-to-end connectivity. This paper provides an overview of the issues that need to be overcome to introduce the terahertz spectrum in mobile networks, from a MAC, network and transport layer perspective, with considerations on the performance of end-to-end data flows on terahertz connections.Comment: Published on IEEE Communications Magazine, THz Communications: A Catalyst for the Wireless Future, 7 pages, 6 figure

    A protocol design paradigm for rateless fulcrum code

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    Establecer servicios Multicast eficientes en una red con dispositivos heterog茅neos y bajo los efectos de un canal con efecto de borradura es una de las prioridades actuales en la teor铆a de la codificaci贸n, en particular en Network Coding (NC). Adem谩s, el creciente n煤mero de clientes con dispositivos m贸viles de gran capacidad de procesamiento y la prevalencia de tr谩fico no tolerante al retardo han provocado una demanda de esquemas Multicast sin realimentaci贸n en lo que respecta a la gesti贸n de recursos distribuidos. Las plataformas de comunicaci贸n actuales carecen de un control de codificaci贸n gradual y din谩mico basado en el tipo de datos que se transmiten a nivel de la capa de aplicaci贸n. Este trabajo propone un esquema de transmisi贸n fiable y eficiente basado en una codificaci贸n hibrida compuesta por una codificaci贸n sistem谩tica y codificaci贸n de red lineal aleatoria (RLNC) denominada codificaci贸n Fulcrum. Este esquema h铆brido de codificaci贸n distribuida tipo Rateless permite implementar un sistema adaptativo de gesti贸n de recursos para aumentar la probabilidad de descodificaci贸n durante la recepci贸n de datos en cada nodo receptor de la informaci贸n. En 煤ltima instancia, el esquema propuesto se traduce en un mayor rendimiento de la red y en tiempos de transmisi贸n (RTT) mucho m谩s cortos mediante la implementaci贸n eficiente de una correcci贸n de errores hacia delante (FEC).DoctoradoDoctor en Ingenier铆a de Sistemas y Computaci贸

    A Comprehensive Survey of the Tactile Internet: State of the art and Research Directions

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    The Internet has made several giant leaps over the years, from a fixed to a mobile Internet, then to the Internet of Things, and now to a Tactile Internet. The Tactile Internet goes far beyond data, audio and video delivery over fixed and mobile networks, and even beyond allowing communication and collaboration among things. It is expected to enable haptic communication and allow skill set delivery over networks. Some examples of potential applications are tele-surgery, vehicle fleets, augmented reality and industrial process automation. Several papers already cover many of the Tactile Internet-related concepts and technologies, such as haptic codecs, applications, and supporting technologies. However, none of them offers a comprehensive survey of the Tactile Internet, including its architectures and algorithms. Furthermore, none of them provides a systematic and critical review of the existing solutions. To address these lacunae, we provide a comprehensive survey of the architectures and algorithms proposed to date for the Tactile Internet. In addition, we critically review them using a well-defined set of requirements and discuss some of the lessons learned as well as the most promising research directions

    The Deep Space Network

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    Progress in flight project support, tracking and data acquisition research and technology, network engineering, hardware and software implementation, and operations are reported

    Workshop on Microwave Power Transmission and Reception. Workshop Paper Summaries

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    Microwave systems performance and phase control are discussed. Component design and reliability are highlighted. The power amplifiers, radiating elements, rectennas, and solid state configurations are described. The proper sizing of microwave transmission systems is also discussed
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