1. Erik, G.L., Edfors, O., Tufvesson, F.: Massive MIMO for next generation wireless systems. IEEE Commun. Mag. 52(2), 186–195 (2014)
2. Junyoung, N., Caire, G., Debbah, M.: Capacity scaling of massive MIMO in strong spatial correlation regimes. IEEE Trans. Inf. Theory 66(5), 3040–3064 (2019)
3. Abbas, Al.W., Rizzo, Al.H.: Efficient evaluation of massive MIMO channel capacity. IEEE Syst. J. 14(1), 614–620 (2019)
4. Jiayi, Z., Chen, S., Lin, Y.: Cell-free massive MIMO: A new next-generation paradigm. IEEE Access 7, 99878–99888 (2019)
5. Emil, B., Hoydis, J., Sanguinetti, L.: Massive MIMO networks: Spectral, energy, and hardware efficiency. Found. Trends Signal Process. 11(3–4), 154–655 (2017)