This document details the process of an investigation initiated from scratch in collaboration with Adrian Agustin, a researcher from the research center Centre Tecnològic de Telecomunicacions de Catalunya (CTTC). It was carried out using the Matlab program, focusing on channel modeling and transceiver design for extremely large antennas in the context of 6G in an indoor environment, such as an auditorium. The main focus of this work is directed toward the MIMO concept, which involves the use of multiple transmission and reception antennas. This channel system introduces an additional spatial dimension to communication, providing a gain in degrees of freedom that can significantly increase channel capacity. The Spectral Efficiency (SE) of the channel between a User Equipment (UE) and a Base Station (BS) is the focal point of this project. Determining the optimal positions of transmitters and receivers is crucial to achieving maximum benefit in SE, as this benefit is directly related to channel capacity, a concept established by Claude Shannon. This project aims to acquire in-depth knowledge of Massive MIMO technology and assess its behavior in terms of Spectral Efficiency. This evaluation includes the application of this technology in a specific environment, the assessment of its impact based on antenna positions, and, finally, the quantification and understanding of gains in Spectral Efficiency. In the proposed auditorium scenario, the results indicate a closer alignment with the Line-of-Sight (LoS) propagation model, revealing direct transmissions with a limited number of reflections. Regarding the position of the transmitting antenna, the best results are obtained when placed on the ceiling or on the side, highlighting the critical influence of physical location in optimizing communication. Additionally, it can be concluded that a greater number of antennas contribute benefits in terms of gains in Spectral Efficiency.
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