2021/06/18 by François Rottenberg, Rottenberg, François, Gilles Callebaut +3
Engineering · #Advanced MIMO Systems Optimization #Advanced Power Amplifier Design #FOS: Electrical engineering #Full-Duplex Wireless Communications #Signal Processing (eess.SP) #electronic engineering #information engineering
paper · pdf · doi:10.48550/arxiv.2106.10140
openalex publication_date 2021/06/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Due to the nonlinearity of power amplifiers (PAs), the transmit signal is\ndistorted. Previous works have studied the spatial distribution of this\ndistortion for a central massive MIMO array. In this work, we extend the\nanalysis for distributed massive MIMO in a line-of-sight scenario. We show that\nthe distortion is not always uniformly distributed in space. In the single-user\ncase, it coherently combines at the user location. In the few users case, the\nsignals will add up at the user locations plus several others locations. As the\nnumber of users increases, it becomes close to uniformly distributed. As a\ncomparison with a central massive MIMO system, having the same total number of\nantennas, the distortion in distributed massive MIMO is considerably more\nuniformly distributed in space. Moreover, the potential coherent combining is\ncontained in a zone rather than in generic directions, i.e., in a beamspot.\nFurthermore, a small-scale fading effect is observed at unintended locations\ndue to the non-coherent combining of the signals. As a result, one can expect\nthat going towards distributed systems allows working closer to saturation,\nincreasing the PA operating efficiency and/or using low-cost PAs.\n