Mchangama, AboubacarAyadi, JaouharGil Jiménez, Víctor Pedro2020-07-062021-03-172020-11-1012th IEEE/IET International Symposium on Communication Systems, Networks and Digital Signal Processing, (CSNDSP 2020), 20-22 Julu 2020, Online, 6 pp.https://hdl.handle.net/10016/30679Proceeding of: 12th IEEE/IET International Symposium on Communication Systems, Networks and Digital Signal Processing, (CSNDSP 2020), 20-22 July 2020, OnlinePromising technologies are being investigated to integrate them into the fifth generation (5G) and beyond mobile network systems. The main goal of these technologies is to evolve cellular network that will significantly stress forward the limit of legacy network systems through all dimensions performance metrics. One of the most potential key enabler technologies is millimeter wave (mmWave) massive multipleinput multiple-output (MIMO) small cells (SC) system. These set of technologies will dramatically increase the network throughput, enhance the spectral and energy efficiency, increase the network capacity and improve the network coverage by using the joint capabilities of the huge available bandwidth in mmWave frequencies while achieving high multiplexing gains through the extreme antenna arrays gains and achieving full coverage network by network densification through small cells. In this paper we present detailed overview of millimeter wave, massive MIMO, small cells, channel estimation, beamforming technology, signal processing techniques in mmWave, beyond 5G systems, and challenges and future research trends.6eng5GMmWaveMIMOMobile networksconference paperElectrónicaTelecomunicacioneshttps://doi.org/10.1109/CSNDSP49049.2020.9249602open access16CC/0000030659