The increased data rates and reliability required to support emerging multimedia applications
require new communications technology. We present results regarding two techniques used
in high data rate transmission As orthogonal frequency division multiplexing (OFDM) the
and multiple-input multiple-output (MIMO) scheme. The aim of this dissertation is to find
efficient methods of providing reliable communication links using MIMO-OFDM under fast
fading scenarios. Toward this end, both equalization and channel coding techniques are
investigated. Despite many advantages of OFDM, OFDM signals are very susceptible to the
time-varying channel, which breaks the orthogonality between sub-carriers, resulting in
inter-channel interference (ICI). The ICI increases an irreducible error floor in proportion to
the normalized Doppler frequency.
This project report uses the LaTeX Template Project Titlepage Modified (v 0.1) by rcx.
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Date: February 2014
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En este trabajo se estudia el comportamiento general del parametro de Hubble para un universo plano que alberga un gas ideal con presion positiva o nula junto con una densidad del vacio compuesta por un termino de costante cosmologica y un termino proporcional a una potencia positiva del parametro de Hubble. Al final se hace el paralelo entre un universo en expansion y el fenomeno de colapso gravitacional esfericamente simetrico. Obtenemos como conclusion que algunas dependencias de la densidad del vacio que crecen mas rapido que H2 inpiden la existencia de singularidades en procesos netamente gravitacionales.
leonardo duarte
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