Distributed or cell-free (CF) massive MIMO (MaMIMO) is a key technology for beyond 5G networks, which promises larger capacity density and quality of service, overcoming the shortcomings of mmWave such as reduced antenna size and path loss. In this chapter, favorable propagation properties are studied for a cell-free MaMIMO system for both line-of-sight (LoS) and multipath Rayleigh fading channels. The advantages of distributed arrays over centralized arrays are presented using 3D beamforming, and a low-complexity partially centralized zero-forcing technique is performed to cancel the interference. To deal with the asynchronous transmission between network nodes in CF architecture, filter bank-based multicarrier (FBMC) has been proposed as a potential option to CP-OFDM in distributed and asynchronous network scenarios since it has better spectral efficiency and robustness to synchronization errors. The performance of a bit-interleaving and iterative decoding receiver is studied to remove the intrinsic interference in FBMC systems.
Cell-free MIMO systems for UDNs
Book Chapter in "Enabling 6G Mobile Networks", 2021, Springer, ISBN: 978-3-030-74647-6
Systèmes de Communication
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