Jiamin Li 0001Xiaoyu Sun 0005Pengcheng Zhu 0001Dongming Wang 0002Xiaohu You 0001Spectral Efficiency and Scalability Analysis for Multi-Level Cooperative Cell-Free Massive MIMO Systems.2023abs/2302.08107CoRRhttps://doi.org/10.48550/arXiv.2302.08107db/journals/corr/corr2302.html#abs-2302-08107