Comparação de desempenho entre as modulações otfs e ofdm em canais de alta mobilidade sob condições de ruído impulsivo

Abstract

The evolution of mobile communications toward sixth-generation (6G) systems imposes new challenges related to reliability, latency, and performance in environments characterized by high mobility and impulsive noise. In this context, more robust modulation techniques become essential to ensure transmission efficiency and data integrity. This Final Course Project aims to compare the performance of OTFS (Orthogonal Time Frequency Space) and OFDM (Orthogonal Frequency Division Multiplexing) modulations under different channel conditions, with emphasis on scenarios involving high Doppler fading, frequency-selective channels, and the presence of impulsive noise. The modulations are analyzed through computational simulations developed in the MATLAB environment, considering different modulation orders (16-QAM, 64-QAM, and 256-QAM) and variations in the statistical model of impulsive noise, based on Poisson and log-normal distributions. Performance evaluation is carried out using Bit Error Rate (BER) curves, allowing a comparative assessment of the resilience of each technique under different levels of channel degradation. The results indicate that the relative performance of OTFS and OFDM depends on the evaluated scenario: in channels with high mobility, multipath propagation, and more severe impulsive noise, OTFS shows greater robustness, while under static conditions or low-severity impulsive noise, OFDM may present similar or slightly better performance. It is concluded that OTFS is a promising alternative for 6G systems in adverse scenarios due to its ability to maintain robustness against multiple impairments, especially when high-order modulation schemes are employed.