Desempenho do Sistema MIMO 2x2 para TV 3.0 em ambientes urbanos complexos: uma abordagem baseada em testes de campo e análise computacional

Abstract

To meet growing demand, transmission technologies need to evolve to offer users a su- perior TV experience, with high-quality audio and video, greater accessibility, interactivity,

and personalized services for fixed and mobile devices. Advanced ISDB-T, developed by NHK,

is an evolution of the ISDB-T standard, already used in Brazil, and incorporates MIMO techno- logy to increase flexibility, robustness, and spectral efficiency, adapting better to different

transmission and reception conditions. This study evaluates the channel's performance through field tests in 30 strategic locations in the city of Rio de Janeiro, with MIMO reception scenarios using a 2x2 transmission configuration. The analysis focuses on essential parameters to assess

the system's robustness under different reception conditions. The main metrics considered in- clude the received signal level, the C/N ratio, the coherence bandwidth, the condition number,

and the MER. The results indicated that evaluating the channel condition number is fundamen- tal for MIMO performance analysis, with values closer to 1 tending to be associated with higher

MER values, showing that well-conditioned channels favor equalization and result in more ro- bust reception. Most points showed excellent performance, even in complex environments,

while some specific locations registered degradation due to more severe propagation condi- tions. It should be noted that, even in proximity to the transmitter, points 29 and 30 showed

inferior performance due to shadowing in the reception environment. Overall, the integrated analysis of metrics proved essential for understanding channel behavior, supporting coverage

planning, and guiding system optimization in real-world scenarios, contributing to the deve- lopment and improvement of TV 3.0.