Máster en Ingeniería de Telecomunicación - TFM - Cursos 2014/2015 - 2019/2020

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    Comprehensive behavioural model for an electronic amplifier used in an optical communications systems
    (Servicio de Publicaciones. Universidad de Navarra., 2019-09-27) Fuentes-Ugartemendia, P. (Patricio); Crespo-Bofil, P. (Pedro)
    Correctly modelling the behaviour of power ampli ers to include the nonlinear aspects of their response has been a matter of interest in the elds of electronic and wireless communications for a considerable amount of time. Throughout the last decades, numerous techniques that succeed in accurately representing these nonlinearities and that provide ways to reduce their impact on system performance have been derived. An essential application of these techniques is the construction of ampli er models that can be used to obtain a deeper understanding of the phenomena that make these devices more or less nonlinear. These models have been used in numerous scenarios to comprehend and devise ways to mitigate the impact of nonlinearity in the response of many ampli ers. However, ultra-broadband RF electronic drive ampli ers used in optical communications environments represent a small niche in which extensive derivation of these ampli er models has not yet been accomplished. In this thesis, a device-speci c behavioural model for one such electronic drive ampli er will be constructed based on existing modelling techniques and extensive lab measurements. In addition, changes in the performance of a communications system when these behavioural models are integrated within it will also be studied. Ultimately, this thesis will strive to determine the speci c phenomena that are linked to the nonlinearity present in the response of an ultra-broadband RF electronic drive ampli er and how variation of these factors a ects the behaviour of this device.
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    Design of High Rate RCM-LDGM Codes
    (Servicio de Publicaciones. Universidad de Navarra, 2019) Granada-Echeverria, I. (Imanol); Crespo-Bofil, P. (Pedro)
    This master thesis is studies the design of High Rate RCM-LDGM codes and it is divided in two parts: In the rst part, it proposes an EXIT chart analysis and a Bit Error Rate (BER) prediction procedure suitable for implementing high rate codes based on the parallel concatenation of a Rate Compatible Modulation (RCM) code with a Low Density Generator Matrix (LDGM) code. The decoder of a parallel RCMLDGM code is based on the iterative Sum-Product algorithm which exchange information between variable nodes (VN) and the corresponding two types of check nodes: RCM-CN and LDGM-CN. To obtain good codes that achieve near Shannon limit performance one is required to obtain BER versus SNR behaviors for di erent families of possible code design parameters. For large input block lengths, this could take large amount of simulation time. To overcome this design drawback, the proposed EXIT-BER chart procedure predicts in a much faster way this BER versus SNR behavior, and consequently speeds up their design procedure. In the second part, it studies two di erent strategies for transmitting sources with memory. The rst strategy consists on exploiting the source statistics in the decoding process by attaching the factor graph of the source to the RCMLDGM one and running the Sum-Product Algorithm to the entire factor graph. On the other hand, the second strategy uses the Burrows-Wheeler Transform to convert the source with memory into several independent Discrete Memoryless (DMS) binary Sources and encodes them separately.