Comparación del desempeño de MRT y MRC en sistemas MIMO masivo utilizando simulación en Matlab

Abstract

The present study addresses the comparison of two downlink SU-m-MIMO configurations, differentiated by their reception strategy: MRT+MRC with a single data stream and MRT+MMSE with two simultaneous streams. The study is justified by the need to understand the trade- off between robustness and spectral efficiency in massive MIMO systems, especially in fading channel environments. The main objective is to analyze the BER performance under different QAM modulations and channel conditions, evaluating the impact of inter-stream interference and noise sensitivity. For this purpose, MATLAB simulations have been performed modeling Rayleigh and Rician channels with spatial correlation and considering the effect of different equalization and precoding schemes. The results show that, although MMSE allows higher spectral efficiency through spatial multiplexing, its implementation significantly increases computational requirements, with an average increase of 40.55% in processing time compared to 23.49% for MRC. It is also confirmed that 16-QAM modulation provides an optimal balance between reliability and energy efficiency in both scenarios. This analysis provides objective criteria for configuration selection in m-MIMO systems, which facilitates adaptive decision making according to channel conditions and system constraints.